Journal articles: 'Dewatering'

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Pan, Jill Ruhsing, Chihpin Huang, Minyih Cherng, Kung-Cheh Li, and Cheng-Fang Lin. "Correlation between dewatering index and dewatering performance of three mechanical dewatering devices." Advances in Environmental Research 7, no. 3 (May 2003): 599–602. http://dx.doi.org/10.1016/s1093-0191(02)00052-7.

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Alimohammadi, M., H. A. Tackley, C. B. Lake, I. Spooner, T. R. Walker, R. Jamieson, C. Gan, and K. Bossy. "Effect of different sediment dewatering techniques on subsequent particle sizes in industrial derived effluent." Canadian Journal of Civil Engineering 47, no. 10 (October 2020): 1145–53. http://dx.doi.org/10.1139/cjce-2019-0269.

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A paucity of literature has compared geotextile dewatering methods to more conventional dewatering methods (i.e., centrifuge, sedimentation) in the context of how geotextile dewatering performs at reducing particulate matter in dewatering effluent. Particulate matter is the primary source of inorganic and organic contaminants (i.e., dioxins and furans) in an unconsolidated sediment (estimated 577 000 m3) that has accumulated in a wastewater stabilization basin in Nova Scotia, Canada. Physical and chemical properties of contaminated sediment were initially characterized, and subsequent laboratory experiments were carried out for three common dewatering methods: sedimentation, centrifugation, and geotextile filtration. Filtrate quality of suspended solids (number, particle size distribution of particles) was examined for differences based on three dewatering techniques assessed. All three methods provided effective removal of particulate matter during dewatering, but geotextile dewatering could be a more cost-effective and practical solution for dewatering of these sediments.

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BARTHES, H., A. BORDAS, D. BOUILLOT, M. BUZON, P. DUMONT, J. FERMIN, J. C. LANDRY, et al. "TUNNELS - DEWATERING." Proceedings of the Institution of Civil Engineers - Civil Engineering 102, no. 5 (May 1994): 26–29. http://dx.doi.org/10.1680/icien.1994.26806.

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Keller, Karsten, and Werner Stahl. "Vibration dewatering." Chemical Engineering and Processing: Process Intensification 33, no. 5 (November 1994): 331–36. http://dx.doi.org/10.1016/0255-2701(94)02004-3.

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LIU, HONGHAI, XIAOKAI ZHANG, and JINGWEN ZHANG. "STUDY OF DEWATERING CHARACTERISTICS OF EUCALYPTUS WOOD BY SUPERCRITICAL CO2." WOOD RESEARCH 67(6) 2022 67, no. 6 (December 13, 2022): 908–18. http://dx.doi.org/10.37763/wr.1336-4561/67.6.908918.

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Wood collapse is a major defect for their applications in solid wood production. Supercritical CO2(ScCO2) dewatering can quickly remove water in wood and effectively reduce the capillary tension leading to collapse of wood structure. In this study, Eucalyptus exsertaF.V. Muellwoodwas dewatered using ScCO2at 35,45,55°Cand 15,20,25 MPa, separately. The dewatering characteristics and wood deformationwere statistically analyzed and compared after dewatering. The results show that the dewatering rateof ScCO2isaffected by moisture content (MC)of wood, showing the higher the MC, the faster the dewatering. Itisalso affected significantly by pressure, indicating increased dewatering ratewith thepressure. The effect of temperature on dewatering rate is not apparent as the pressure is less than 25MPa, but it becomes significantat 25MPacondition, showing an increased dewatering rate with temperature. In this experiment, the greatest dewatering rate was 19.8%·h-1at 55°Cand 25MPa. The transversal shrinkage of all specimens after 5 cycles dewatering waslower than1.5%, indicating the ScCO2dewatering could effectively inhibit collapse of eucalyptus wood structure. Thetransversal shrinkage decreases with the pressure, and is not affected significantly by temperature.

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IWAI, Shigerhisa, Tadao KUROKAWA, and Hideki FUZII. "Sludge dewatering by multi rotating disc dewatering machines." Journal of Environmental Conservation Engineering 18, no. 10 (1989): 635–39. http://dx.doi.org/10.5956/jriet.18.635.

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Muralidhara*, H. S., H. Hampel**, and H. Kröoening***. "DEWATERING OF HAMBURG'S DREDGED MATERIAL BY ELECTROACOUSTIC DEWATERING." Drying Technology 6, no. 3 (September 1988): 535–46. http://dx.doi.org/10.1080/07373938808916397.

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Yu, Xiao Yan, Su Li Zhi, Run Juan Wang, Shu Ting Zhang, and Xue Bin Lu. "Influence of Chemical Conditioning on Electroosmotic Dewatering Behavior for Activated Sludge." Advanced Materials Research 573-574 (October 2012): 126–30. http://dx.doi.org/10.4028/www.scientific.net/amr.573-574.126.

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Applying electroosmosis to sludge dewatering practically, methods for improving electroosmotic dewatering must be explored. The influence of initial pH, adding Al2 (SO4)3 dose and ash content in sludge on electroosmotic dewatering behavior was investigated. The results show that acid or alkaline environment is unfavorable for electroosmotic dewatering, especially initial pH of sludge closing to the isoelectric point, electroosmotic dewatering behaves worst. With increasing Al2(SO4)3 coagulant-aid dose, the decreasing rate of water content becomes slower gradually during electroosmotic dewatering. Besides, higher ash content in sludge has a better effect on vaccum filtration, but slightly impact on electroosmotic dewatering. When ash content increases to 69.9% from 52.4%, final water content reduces to 64.3% from 78.3% using vaccum filtration, and the decreasing amount of water content by electroosmotic dewatering ranges from 16.5% to 12.3%.

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Yang, Lin. "Effect of Temperature and Pressure of Supercritical CO2 on Dewatering, Shrinkage and Stresses of Eucalyptus Wood." Applied Sciences 11, no. 18 (September 18, 2021): 8730. http://dx.doi.org/10.3390/app11188730.

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Supercritical CO2 (SuCO2) dewatering can mitigate capillary tension and reduce wood collapse. In this study, Eucalyptus urophylla × E. grandis specimens were dewatered by SuCO2 at temperatures of 35, 40 and 55 °C, in pressures of 10 and 30 MPa, respectively, for 1h. Effects of temperature and pressure on dewatering rate, moisture content (MC) distribution and gradient, shrinkage and residual stress of wood after dewatering were investigated. The results indicate that the SuCO2 dewatering rate is much faster than that of conventional kiln drying (CKD). The dewatering rate increases with increasing of temperature and pressure; however, pressure has a significant influence, especially for the high-temperature dewatering process; the MC distribution after 1h dewatering is uneven and MC gradients decrease with reducing of mean final MC of wood. MC gradients along radial direction are much smaller than that in tangential direction; collapse of wood significantly reduces after dewatering due to SuCO2 decreasing the capillary tension, and residual stress of wood during dewatering is mainly caused by pressure of SuCO2, which decreases with increasing temperature. SuCO2 dewatering has great potential advantages in water-removal of wood prone to collapse or deformation.

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Avancini, Livia Luiza de Souza, Matheus Muller, and Delma de Mattos Vidal. "Application of polyelectrolytes for improving the dewatering performance of drinking water treatment sludge using geotextiles." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 16, no. 5 (October 6, 2021): 1–14. http://dx.doi.org/10.4136/ambi-agua.2723.

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The sludge generated at drinking water treatment plants (WTPs) is a high-moisture content residue, and therefore difficult to handle, transport, dispose of or recover. During the last decades, geotextile tubes have been successfully applied to reduce the residue volume, facilitate its handling and subsequent reuse. This study aimed to understand the factors that interfere in the filtration and dewatering efficiencies and to experimentally analyze the dewatering process of WTPs sludge, evaluating different test procedures and investigating the influence of the type and dosage of polymeric additives on dewatering performance. Geotextile cone dewatering tests and geotextile bag dewatering tests were performed, using four different woven geotextile samples and an aluminum sulfate WTP sludge sample. The results showed that the use of geotextile cone dewatering tests for geotextile selection and for additive selection and dosage was representative for the dewatering process intended, reflecting the results verified in the geotextile bag dewatering tests. Sludge chemical conditioning increased dewatering rate and solids retention during the tests’ early stages, but it did not result in a higher final solids content sludge cake. Keywords: dewatering systems, geosynthetics, waste management.

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To, Vu Hien Phuong, Tien Vinh Nguyen, Saravanamuth Vigneswaran, and Huu Hao Ngo. "A review on sludge dewatering indices." Water Science and Technology 74, no. 1 (March 7, 2016): 1–16. http://dx.doi.org/10.2166/wst.2016.102.

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Dewatering of sludge from sewage treatment plants is proving to be a significant challenge due to the large amounts of residual sludges generated annually. In recent years, research and development have focused on improving the dewatering process in order to reduce subsequent costs of sludge management and transport. To achieve this goal, it is necessary to establish reliable indices that reflect the efficiency of sludge dewatering. However, the evaluation of sludge dewaterability is not an easy task due to the highly complex nature of sewage sludge and variations in solid–liquid separation methods. Most traditional dewatering indices fail to predict the maximum cake solids content achievable during full-scale dewatering. This paper reviews the difficulties in assessing sludge dewatering performance, and the main techniques used to evaluate dewatering performance are compared and discussed in detail. Finally, the paper suggests a new dewatering index, namely the modified centrifugal index, which is demonstrated to be an appropriate indicator for estimating the final cake solids content as well as simulating the prototype dewatering process.

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Zhang, Aiqing, Jinyun Li, and Yiming Wang. "Study on Hydrodynamics Model of Total Tailings Filling Slurry Dehydration." Advances in Civil Engineering 2021 (September 11, 2021): 1–7. http://dx.doi.org/10.1155/2021/9225718.

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In order to ensure the dehydration effect of the whole tailings backfill, a dehydration model of the whole tailings backfill was established based on hydrodynamics on the basis of satisfying certain assumptions, and the theoretical solution was carried out. The control variable method is used to study the variation of dewatering capacity with dewatering depth and radius, and the applicability of the dewatering model is verified by experiments. The results show that the dewatering capacity increases with the increase of dewatering radius and decreases with the increase of dewatering depth by a quadratic polynomial. By comparing the experimental values with the theoretical ones, it is found that the variation law of the dewatering capacity with radius is the same and increases with the increase of dewatering depth. The reason is that the content of fine particles in the unclassified tailings is large and the filter hole on the branch pipe is blocked under the action of the hydrodynamic force. Therefore, the dewatering effect of the new root-like dehydration tube can be guaranteed by using the branch pipe arranged at the full height of main dewatering pipe. The dehydration model is modified by the test results to ensure the applicability.

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A, Lesti Herawati, and Rolando A. "INTEGRATED DEWATERING SYSTEM (IDS)." Prosiding Temu Profesi Tahunan PERHAPI 1, no. 1 (March 29, 2020): 705–14. http://dx.doi.org/10.36986/ptptp.v1i1.112.

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ABSTRAK Dalam bisnis proses penambangan batubara dengan metode penambangan Open Pit Mining, dewatering menjadi salah satu kunci sukses keberhasilan operasional penambangan. Oleh karena itu proses perencanaan, eksekusi, monitoring dan evaluasi dewatering wajib dilaksanakan dengan baik. Sebagai salah satu aktivitas kritikal, dewatering memerlukan proses monitoring yang baik untuk mencapai Excellence Dewatering dan cost dewatering yang efisien. Terlebih di era digital seperti saat ini, proses monitoring dewatering yang real time, cepat, akurat, komprehensif dan terintegrasi mutlak diperlukan. Digitalisasi monitoring dewatering dengan “Integrated Dewatering System” (IDS) menjadi solusi atas challenge untuk monitoring dewatering yang excellence. Integrated Dewatering System (IDS) : Suatu sistem Dewatering yang terintegrasi dalam pengumpulan, pengolahan & penyajian data secara real time sehingga dapat digunakan sebagai dasar analisa & pengambilan keputusan yang cepat & tepat guna mewujudkan tambang No Flood dengan Cost Dewatering yang efisien. Cakupan area monitoring IDS meliputi : curah hujan, sump, pompa. Hardware IDS yaitu : Weather Station alat untuk mengukur curah hujan, durasi hujan, frekuensi hujan secara real time; 2) Automatic Flowmeter alat untuk mengukur debit pompa secara otomatis dan real time; 3) Automatic Water Level alat untuk mengukur elevasi sump (area tampungan air di pit), sehingga elevasi sump dapat dimonitor secara real time. Secara umum proses monitoring Dewatering dengan IDS adalah sebagai berikut : weather station mengukur curah hujan (mm), durasi hujan (menit), frekuensi hujan, data curah hujan kemudian dilakukan proses perhitungan untuk menghitung volume run off yang masuk ke tambang, air yang masuk ke dalam sump secara berkesinambungan dipompa, debit pemompaan diukur dengan menggunakan automatic flowmeter, selanjutnya automatic water level mengukur elevasi sump, kemudian sistem akan mengolah data-data output dalam software IDS yang kemudian menyampaikan Alert melalui media mobile phone informasi status sump sebagai Early Warning untuk memberikan “guidance corrective action” terhadap kondisi dewatering yang terjadi. Manfaat dari IDS yaitu : 1) Proses monitoring curah hujan, debit pompa dan elevasi air lebih cepat, mudah; 2) Data monitoring Dewatering akurat dan terintegrasi; 3) Memberikan Early Warning terhadap status sump sehingga corrective action yang tepat dan cepat dapat segera dilaksanakan; 4) Mencegah tambang Flood dengan corrective action yang cepat, 5) Meningkatkan aspek Safety karena high risk activity berkurang; 6) Cost dewatering efisien dengan operasional pompa (debit, Rotary Per Minutes, Utilization Availability) yang optimum. Kata kunci : IDS, weather station, automatic flowmeter, automatic water level ABSTRACT In the business of coal mining using the Open Pit Mining method, dewatering is one of the keys to the success of mining operations. Therefore the process of planning, execution, monitoring and evaluation of dewatering must be carried out properly. As one of the critical activities, dewatering requires a good monitoring process to achieve Excellence Dewatering and cost-efficient dewatering. Especially in the digital era as it is today, real-time, fast, accurate, comprehensive and integrated dewatering monitoring process is absolutely necessary. The digitization of dewatering monitoring with the "Integrated Dewatering System" (IDS) is the solution to the challenge for excellence dewatering monitoring. Integrated Dewatering System (IDS): A Dewatering system that is integrated in the collection, processing & presentation of data in real time so that it can be used as a basis for analysis & decision making that is fast & precise in order to realize the No Flood mine with an efficient Cost Dewatering. The scope of the IDS monitoring area includes: rainfall, sumps, pumps. IDS hardware namely: 1) Weather Station tool to measure rainfall, duration of rain, frequency of rain in a Manner real time; 2) Automatic Flowmeter tool to measure pump flow automatically and in real time; 3) Automatic Water Level tool to measure the elevation of the sump (water catchment area in the pit), so that the sump elevation can be monitored in real time. In general the Dewatering monitoring process with IDS is as follows: weather station measures rainfall (mm), duration of rain (minutes), frequency of rainfall, rainfall data then the calculation process is carried out to calculate the volume of run-off entering the mine, water entering in a sump continuously pumped, pumping discharge is measured using automatic flowmeter, then automatic water level measures the elevation of the sump, then the system will process the output data in the IDS software which then conveys the "Alert" through the mobile phone media sump status information as an Early Warning for provide "guidance corrective action" for conditions of dewatering that occur. Benefits of IDS are: 1) The process of monitoring rainfall, pump discharge and water elevation is faster, easier; 2) Dewatering monitoring data is accurate and integrated; 3) Give an Early Warning on the status of the sump so that corrective action is appropriate and quickly can be implemented immediately; 4) Prevent Flood mining with fast corrective action; 5) Improve the Safety aspect because of the reduced high risk activity; 6) Cost-efficient dewatering with pump operations (discharge, Rotary Per Minutes,Utilization Availability) is optimum. Keywords: IDS, weather station, automatic flow meter, automatic water level

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Yuan, Hua, and Yan Hong. "Change of Soil Stress State around Foundation Pit due to Dewatering." Advanced Materials Research 594-597 (November 2012): 604–7. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.604.

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Engineering dewatering has been widely used to improve soil characteristics currently, whereas dewatering always bring about soil settlement around the pumping well inevitably, which may be the largest defect of dewatering. In this paper, several possible factors leading to soil subsidence are explored, then the change of soil stress under the action of dewatering drainage during phreatic aquifer well pumping are investigated. From the two aspects that may be encountered during dewatering in confined aquifer: only pressure lowering effect as well as simultaneous function of both pressure relief and dewatering drainage, we study the change of soil stress state around foundation pit. The conclusions obtained through this research will contribute much to the calculation of soil settlement caused by dewatering, also beneficial to seek the settlement control measures.

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Ming-Jie, CAO, Ding Chun-Mei, and Ren Ze-Dong. "Experimental Study of the Electro-osmotic Dewatering in Hangbag." Open Civil Engineering Journal 9, no. 1 (February 27, 2015): 7–11. http://dx.doi.org/10.2174/1874149501509010007.

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In recent years, geotube began to be widely used in treatment of coastal reclamation projects. However, the dewatering of sludge in geotube is inefficient. In this paper, for improving dewatering efficiency and laying a basis for the further study of large-scale electro-osmotic dewatering in geotube, electroosmosis has been applied to silt dewatering experiments in small hangbag. By measuring the change of moisture content, electricity current, voltage and comparing with other experiments under different conditions, the following conclusions have been obtained: the electro-osmotic dewatering speed is much faster than the natural dewatering. The non-woven fabric bag is easier to dewater than the high strength fabric bag which is made by the company of Royal Tencate.

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Guo, Bai Liang, and Hong Bin Liu. "Project Design of Dewatering for Deep Foundation Pit in Dalian." Applied Mechanics and Materials 580-583 (July 2014): 440–44. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.440.

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Tube well dewatering is widely applied in deep foundation pit for its large water discharge, good dewatering effect, simple equipment and easy maintenance. In this paper, rube well dewatering is designed for the temporary project of foundation pit according to the engineering characteristics and stratum and underground water distribution with the deep foundation pit engineering as the background. The required parameters and design process of well tube dewatering are illustrated, and experience of applying tube well dewatering in evacuation of deep foundation pit is accumulated, which will be of certain referential significance for similar projects.

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Wang, Wansheng, Xiaolei Man, Wanglin Li, Xia Xue, and Xiaomin Teng. "Experimental study on the effect of particle gradation on dewatering performance of geotubes." Journal of Measurements in Engineering 10, no. 2 (June 27, 2022): 81–92. http://dx.doi.org/10.21595/jme.2022.22468.

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To clarify the effect of particle gradation of filling soil on the dewatering and consolidation performance of geotubes, the content of four-particle size classes (powder, fine, medium, and coarse) which are commonly used in engineering as the research object was taken. The dewatering rate, soil infiltration and solid-liquid mixing pressure in the bag with time when filling soil with different particles were studied, and the soil loss of the hanging bag was analyzed from the perspective of seepage soil gradation. The research results show that the dewatering process could be divided into the quick dewatering stage, silting stage, and stable stage according to the dewatering rate. According to the performance of soil conservation, it could be divided into the loss stage and reverse filtration stage. Further, based on the effects of powder content, non-uniformity coefficient, and curvature coefficient of soil on the dewatering rate of the hanging bag, a formula for calculating the dewatering rate of geotubes is summarized.

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Qi, Yongzheng, Zongzhi Wang, Pengming Jiang, Yunfei Guan, Liyan Wang, Ling Mei, Aizhao Zhou, Heying Hou, and Haoqing Xu. "Test and Analysis of Sludge Dewatering with a Vacuum Negative Pressure Load at the Bottom of Full Section." Advances in Civil Engineering 2020 (October 14, 2020): 1–12. http://dx.doi.org/10.1155/2020/8875912.

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At present, the sludge production has increased sharply, and sludge treatment remains a serious problem. Rapid sludge dewatering is the key problem of sludge treatment, and the main approach for reducing the cost of the sludge treatment is to reduce the cost of sludge dewatering. In this paper, two groups of sludge dewatering tests were carried out using homemade instruments and equipment. One group was conducted without rice straw, and the other group was conducted with rice straw. The relevant mechanism was analyzed, and the results indicate that sludge dewatering with a vacuum negative pressure load of the full section at the bottom is better than mechanical sludge dewatering. The sludge dewatering effect with rice straw is better than that without rice straw. Additionally, the vacuum degree inside the sludge decreased sharply. The pore water pressure slowly dissipates during the early and late stages and quickly during the middle stage. Sludge pore water seepage does not obey Darcy’s law, and sludge dewatering is intermittent.

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Zhang, Dong Dong. "Coupled Numerical Simulation Research on Dewatering and Land Subsidence in Deep Foundation Pit." Applied Mechanics and Materials 275-277 (January 2013): 1549–52. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1549.

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With the construction of deep and large foundation pit, land subsidence disasters caused by dewatering in deep foundation pit become very serious. Using the coupled model of foundation pit dewatering and land subsidence and putting it into foundation pit dewatering construction, analyzes and summarizes the effect of land subsidence in space and time, which will provide references for the design and construction of foundation pit dewatering.

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Wollny, Klaus. "New Rheological Test Method to Determine the Dewatering Kinetics of Suspensions." Applied Rheology 11, no. 4 (August 1, 2001): 197–202. http://dx.doi.org/10.1515/arh-2001-0012.

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Abstract Rheology plays an important role in dewatering processes. It is therefore interesting to analyze the dewatering process and the rheological behavior of a suspension simultaneously. An exact determination of the immobilization point at the maximum of the loss factor as well as the immobilization time can be attained using an oscillatory time test with preset strain. The degree of dewatering is determined via normal force controlled gap setting. This report offers an insight into the theory of the dewatering of liquid supersaturated suspensions and shows how the kinetics of dewatering can be determined using paper coating as an example.

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Yang, T. L., X. X. Yan, H. M. Wang, X. L. Huang, and G. H. Zhan. "Comprehensive experimental study on prevention of land subsidence caused by dewatering in deep foundation pit with hanging waterproof curtain." Proceedings of the International Association of Hydrological Sciences 372 (November 12, 2015): 1–5. http://dx.doi.org/10.5194/piahs-372-1-2015.

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Abstract. Land subsidence caused by dewatering of deep foundations pit has currently become the focus of prevention and control of land subsidence in Shanghai. Because of the reliance on deep foundation dewatering pit projects, two comprehensive test sites were established to help prevent land subsidence. Through geological environmental monitoring during dewatering of a deep foundation pit, the analysis of the relation between artesian water level and soil subsidence, some basic features of land subsidence caused by dewatering of deep foundation pits are elucidated. The results provide a scientific basis for prevention and control of land subsidence caused by dewatering in deep foundation pits.

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Smollen, Maryla, and Achmad Kafaar. "Electroosmotically enhanced sludge dewatering: pilot-plant study." Water Science and Technology 30, no. 8 (October 1, 1994): 159–68. http://dx.doi.org/10.2166/wst.1994.0402.

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Owing to the inherent inefficiency of dewatering equipment widely used today, the search for improved dewatering techniques has been pursued by the investigation of new innovative ideas. The main thrust of these investigations has been in electroosmotic dewatering which presents a novel approach in South Africa. The separation of the sludge liquid phase is governed by the intensity of binding forces. There are different physical forms of water in sludge and these different forms play an important role in determining the ease or difficulty of phase separation. It seems that the inefficiency of dewatering applied to gelatinous and fine-particle sludges can be overcome by mechanical dewatering enhanced by electroosmosis. A prototype pilot-plant embodying these principles has been developed for commercial application to dewatering of troublesome sewage sludges.

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Li, Zhanfu, Peiyu Jia, Kunyuan Li, Xin Tong, and Zhihong Wu. "Study on screening performance and parameter optimization of vibrating-dewatering screen." Advances in Mechanical Engineering 13, no. 9 (September 2021): 168781402110465. http://dx.doi.org/10.1177/16878140211046580.

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In this paper, the dewatering and screening process of vibrating-dewatering screen is studied by the combination of simulation test and physical experiment. The simulation model of dewatering screening process is established by the method of computational fluid dynamics (CFD) and discrete element method (DEM). Subsequently, the screening efficiency and processing efficiency are defined as evaluating indexes for performance of dewatering and screening. Four parameters of amplitude, vibration frequency, vibrating direction angle and slope angle of screen surface are selected for single factor simulation test, and the variation of dewatering and screening performance under different parameters is obtained. Finally, the reliability of the simulation results is verified by the physical experiment platform, and significant factors affecting the evaluation index of the vibrating-dewatering screen parameters and the optimal parameter combination are obtained by orthogonal test.

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Huang, Feng, Jianguo Lyu, He Gao, and Zhaoteng Yu. "Groundwater Level Distribution in Vacuum Dewatering Method in Phreatic Aquifer." Geofluids 2018 (2018): 1–7. http://dx.doi.org/10.1155/2018/8459289.

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Vacuum dewatering method has been widely used in geotechnical engineering. However, there is little research on the groundwater level distribution under the effect of vacuum pressure which is generated by vacuum wells. In view of this, the groundwater level distribution in phreatic aquifer is analyzed. First, the vacuum pressure distribution in soil is analyzed through Darcy’s law and steady-state seepage control equation based on established particles and pores model. Second, the boundary conditions are modified by the vacuum pressure distribution law and then the water level distribution equations in flow boundary and waterhead boundary conditions are derived. Finally, dewatering experiment is carried out to analyze the water levels in vacuum and nonvacuum dewatering and verify the theoretical model of water level distribution in vacuum dewatering. The results show that, in both boundary conditions, the water levels in vacuum dewatering are lower than those in nonvacuum dewatering. The theoretical values agree with the experimental values well, which proves the rationality of theoretical equations and predicting the water levels in vacuum dewatering method.

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Basamykina, Alena, Marianna Kharlamova, and Sharon Yeukai Mada. "Dewatering as a primary treatment of faecal sludge in individual residential sector (a technologies review)." E3S Web of Conferences 169 (2020): 02008. http://dx.doi.org/10.1051/e3sconf/202016902008.

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Dewatering of faecal sludge (FS) is the most efficient method of pretreatment of bioorganic human waste for minimizing the faecal sludge volume. This process may be considered as one of management tool in service chain of Faecal Sludge Management (FSM). For this purpose technological features of methods, the advantages, disadvantages and possibilities of the use have been analysed. The article provides a review of the most efficiently methods of faecal sludge dewatering generated in the individual residential sector (unplanted drying beds, planted drying beds, solar drying, mechanical dewatering, geotubes) and their analysis in order to select the best available technology in accordance with the selection criteria. We used the analytic hierarchy process to determine the most multi-operated and effective processing method of faecal sludge dewatering. The final ranking for each dewatering technology was based on the global weights of 10 criteria (dewatering efficiency, operation time, process automation, required space, climate dependent, capital expenditures, operating costs, energy efficiency and environmental impact). The results identify dewatering method with the highest priority result based on priority eigenvalues of criteria.

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Kotera, H., T. Sakemi, and T. Matsui. "A precompression method of soft ground improvement using dewatering." Geological Society, London, Engineering Geology Special Publications 7, no. 1 (1991): 651–58. http://dx.doi.org/10.1144/gsl.eng.1991.007.01.65.

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AbstractThe background and geology of the Tokyo Bay area of Japan, and recent soil improvement methods used in Japan are described. The vertical drain method has frequently been used to improve thick quarternary deposits in this area. This paper describes a case history of a dewatering method in combination with the vertical drains and preloading in a major soft ground improvement project in the Urayasu area of the Tokyo Bay. The dewatering method is a vacuum consolidation method, which is tentatively applied to the soft clay ground.In the combined dewatering method, the waterhead in a vertical sand drain is lowered by pumping the water from a sand layer within or below a soft clayey layer using deep wells. The dewatering applies negative water pressure to the soft clayey layer, promoting its consolidation.The authors confirm the consolidation effect of the dewatering and establish the applicability of the combined dewatering method to the soft clay ground.It is concluded that the dewatering method described significantly increases the shear strength and the consolidation yield stress of the soft clayey layer.

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Horenstein, Bennett K., Gerald L. Hernandez, Gary Rasberry, and John Crosse. "Successful Dewatering Experience at Hyperion Wastewater Treatment Plant." Water Science and Technology 22, no. 12 (December 1, 1990): 183–91. http://dx.doi.org/10.2166/wst.1990.0113.

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The City of Los Angeles has developed a diversified sludge management program since cessation of the ocean disposal of sludge in November 1987. At the heart of this program is the centrifugal dewatering of digested sludge at the Hyperion Wastewater Treatment Plant. The experience gained from the dewatering process includes: centrifuge startup problem solving, optimization of the dewatering process, polymer testing, struvite monitoring and control, and waste activated sludge dewatering parameter development.

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Verbovskyi, Orest, Vadym Orel, Oksana Matsiyevska, and Davyd Derkach. "Sewage sludge dewatering by electric field." Problems of Water supply, Sewerage and Hydraulic, no. 40 (September 26, 2022): 16–25. http://dx.doi.org/10.32347/2524-0021.2022.40.16-25.

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During the cleaning and further treatment of municipal wastewater, sediments are formed, which are extremely dangerous from a sanitary and hygienic point of view, poorly dewatered, have high humidity (over 90%), large volumes (up to 3% of wastewater consumption), contain organic substances, pathogens, heavy metals, etc. In Ukraine, at most wastewater treatment plants, sewage sludge is mostly piled up on sludge sites after minimal treatment. Effective processing and disposal of sewage sludge in order to reduce the negative impact on the environment, as well as the use of sewage sludge as secondary raw materials, is an actual, complex and urgent task. The key link in the existing process of treatment and disposal of sewage sludge is their dewatering. When designing facilities for the treatment and disposal of sewage sludge, advanced technologies should be used, the use of which is based on scientific and technical research. The article reviews the results of research on the intensification of existing mechanical methods of sewage sludge. One of the most effective methods of intensifying the process of dewatering sewage sludge is electro-dewatering, which involves the application of an electric field during mechanical dewatering of sludge. Electro-dewatering technology makes it possible to reduce the humidity of sediments to 20...40%, reduce the concentration of heavy metals and pathogens in sediments, etc. The purpose of this work is to study the possibility of electro-dewatering of activated sludge from secondary settling tanks of municipal wastewater treatment plants in Lviv. Empirical research methods were used. A laboratory scale has been designed for electro-dewatering of sewage sludge. Activated sludge with a moisture content of 98% was studied. It is shown that the effect of activated sludge dewatering, depending on the duration of its treatment, is an S-shaped curve that resembles a kinetic autocatalytic reaction with three periods: induction, main, and fading. The possibility of electro-dewatering of sewage sludge with a maximum dewatering effect of 60% has been proven. Therefore, it is proposed to carry out mechanical dewatering of city sewage sludge using an electric field.

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Li, Yunhui, Heather Kaminsky, Xue Yuki Gong, Yijia Simon Sun, Mohammed Ghuzi, and Ardalan Sadighian. "What Affects Dewatering Performance of High Density Slurry?" Minerals 11, no. 7 (July 14, 2021): 761. http://dx.doi.org/10.3390/min11070761.

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The dewatering of flocculated high density slurry presents a significant challenge to most mining industries. The new technologies to treat high density slurry require a consistent and robust flocculation method in order to enter the market of tailings management. The flocculation of high density slurry, however, due to its complexity, is always a challenge to be undertaken appropriately and to evaluate the dewatering performance correctly. This paper probes the complexity by using a torque-controlled mixing technique to demonstrate the influence of feed properties, polymer type, polymer dosage, and mixing conditions on dewatering performance. The study shows that flocculant should be dosed at the optimal range to achieve the highest dewatering performance. A full dosage responsive curve including under dosage, optimal dosage, and overdosage is critical to evaluate the dewatering performance of high density slurries and flocculants. The mixing conditions such as mixing speed, mixing time, and geometry of the mixing impeller affect the flocculation efficacy. It was found that the dewatering performance of high density slurry is sensitive to solids content, water chemistry, and clay activity. High sodicity and high clay activity in the high density slurry decreases the dewatering performance. Therefore, it is critical to evaluate flocculants across multiple feeds and dosages with replication in order to select optimal dewatering performance. Using multiple key performance indicators (KPIs) to build technical and economic criteria is also critical for polymer evaluation.

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Xia, Jiahua, Juan Ji, Zhiqiang Hu, Ting Rao, Ankang Liu, Jingqian Ma, and Yongjun Sun. "Application of Advanced Oxidation Technology in Sludge Conditioning and Dewatering: A Critical Review." International Journal of Environmental Research and Public Health 19, no. 15 (July 29, 2022): 9287. http://dx.doi.org/10.3390/ijerph19159287.

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Sludge dewatering is an important link in sludge treatment. In practical engineering, the dewatering effect of unconditioned sludge is very poor. The use of advanced oxidation technology can improve sludge dewatering performance, reduce sludge capacity, and remove micro-pollutants, which is beneficial for sludge post-treatment and disposal. Based on the current status of sludge conditioning and dehydration, the characteristics of the advanced oxidation method for sludge dehydration were systematically explained using various free radical reaction mechanisms and dehydration conditions. The effects of various advanced oxidation technologies on sludge conditioning and dewatering has been extensively discussed. Finally, the application prospects of the advanced oxidation technology in sludge conditioning and dewatering are presented.

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Gao, Yu Feng, Qin Yu Zhang, Yuan Zhou, and Ying Zhang. "Predict Model for Water Content of Dredged Sludge under the Aeration-Vacuum Condition." Advanced Materials Research 446-449 (January 2012): 1472–75. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1472.

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The clogging problem occurs in the dewatering projects of sludge with high water content and high clay particles content can be solved by the aeration-vacuum dewatering method. And the water in the sludge can be separated out quickly. Through the dewatering model test of the sludge with this method, the effects of vacuum degree and aeration rate on the dewatering results are studied. The relationship between the initial and final water content is got under the aeration-vacuum condition. Through the fitting analysis of the dewatering curves, the predict model for water content of dredged sludge is presented. And the effect mechanism of the vacuum degree and aeration rate are analyzed.

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HILLS, B. A., and I. B. MASTERS. ""Dewatering" the lungs." Archives of Disease in Childhood - Fetal and Neonatal Edition 80, no. 1 (January 1, 1999): F78. http://dx.doi.org/10.1136/fn.80.1.f78.

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Pearsall, Robert, Rhykka Connelly, Mark Fountain, Clay Hearn, Michael Werst, Robert Hebner, and Edward Kelley. "Electrically dewatering microalgae." IEEE Transactions on Dielectrics and Electrical Insulation 18, no. 5 (October 2011): 1578–83. http://dx.doi.org/10.1109/tdei.2011.6032827.

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Hogg, R. "Flocculation and dewatering." International Journal of Mineral Processing 58, no. 1-4 (February 2000): 223–36. http://dx.doi.org/10.1016/s0301-7516(99)00023-x.

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35

Forsberg, Sven, and Liselotte Aldén. "Dewatering of peat." Fuel 68, no. 4 (April 1989): 446–55. http://dx.doi.org/10.1016/0016-2361(89)90266-4.

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Castrantas, Harry, and Frank Caropreso. "5030359 Dewatering sludge." Environment International 18, no. 3 (January 1992): XVIII. http://dx.doi.org/10.1016/0160-4120(92)90183-5.

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Carleton, A. J., and A. G. Salway. "Dewatering of cakes." Filtration & Separation 30, no. 7 (November 1993): 641–36. http://dx.doi.org/10.1016/0015-1882(93)80498-l.

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Wang, Wei Hui, Guang Zhong Hu, and Min Zhou. "Refined Cotton Centrifugal Dewatering Process and Key Technology." Advanced Materials Research 179-180 (January 2011): 1124–29. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.1124.

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At home and abroad the process of refined cotton mainly used pressing for washing and dehydration. The refined cotton with high water content, drying energy consumption is high. In this paper, base on the application of centrifugal dewatering process nitrocellulose, combined the characteristics of refining cotton with centrifugal dewatering process principles, the key technology of overflow limit and Pusher resistance were analyzed and discussed. Centrifuge dewatering replaced pressing dewatering, can improve product quality, and achieve energy saving with good socio-economic benefits.

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Zheng, Yuchao, Jianyong Lei, Fei Wang, Liang Xiang, Jianfeng Yang, and Qingshuai Xue. "Investigation on Dewatering of a Deep Shaft in Strong Permeable Sandy Pebble Strata on the Bank of the Yellow River." Geofluids 2021 (September 24, 2021): 1–15. http://dx.doi.org/10.1155/2021/9994477.

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This paper reports the dewatering scheme of a deep excavation in sandy pebble strata. The excavation is in high permeability strata and is close to the Yellow River, making the dewatering difficult during construction. At present, few researchers have specially studied the dewatering scheme of deep excavations in strong permeable strata near the water resource. Field pumping test was conducted before the excavation activity, and the permeability coefficient of the strata was obtained by reverse analysis. According to the characteristics of the project, the dewatering scheme of “ waterproof curtain + base grouting + pumping ” was proposed. The influence of vertical waterproof curtain and base grouting on dewatering was analyzed by numerical simulation. In the construction process, the field water table and ground settlement were measured. The results show that (1) the groundwater table versus permeability coefficient curve shows three different stages and (2) the dewatering scheme of “ waterproof curtain + base grouting + pumping ” is effective for deep excavation in strong permeable strata.

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Chen, Li. "Stability Analysis of Mechanical Sludge Dewatering Machine Frame Based on Numerical Simulation." Journal of Physics: Conference Series 2152, no. 1 (January 1, 2022): 012047. http://dx.doi.org/10.1088/1742-6596/2152/1/012047.

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Abstract Sludge is the inevitable product of sewage treatment plant and sewage treatment. Before sludge treatment, dewatering is generally required. Mechanical sludge dewatering machine is a common sludge dewatering equipment. Due to the complex operation conditions, the stability of sludge dewatering machine frame directly affects its reliability. In this paper, a mechanical sludge dewatering machine frame as the research object, based on ANSYS Workbench finite element analysis platform, static analysis and modal analysis. The analysis results show that: under normal working conditions, the maximum variable of the frame is 0.07mm, which can effectively ensure the normal operation of the sludge dewatering machine; the equivalent stress is 4.22Mpa, which is far less than the Xu Yong stress of the material; the vibration of the first two modes of the frame is relatively concentrated, and the corresponding motor speed under the interference frequency is 1241.4-1595.4r/min, which should be avoided in the use process.

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41

Liu, Linghui, Mingfeng Lei, Chengyong Cao, and Chenghua Shi. "Dewatering Characteristics and Inflow Prediction of Deep Foundation Pits with Partial Penetrating Curtains in Sand and Gravel Strata." Water 11, no. 10 (October 19, 2019): 2182. http://dx.doi.org/10.3390/w11102182.

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The dewatering of deep foundation pits excavated in highly permeable geology usually requires waterproofing technologies to relieve groundwater flow. However, no effective prediction formula is yet available for determining water inflow in the presence of partial penetrating curtains. In this study, a dewatering project with partial penetrating curtains is analyzed via a finite difference method to show evident three-dimensional (3D) seepage characteristics. The standard curve and distortion functions are established under the assumption of an equivalent well by quantifying the blocking effects; thus, the empirical inflow prediction formulas for steady flow are further developed. Moreover, a dewatering design method based on the prediction formulas is proposed and applied to the field dewatering project in sand and gravel strata. Measured results show that dewatering efficiency is considerably enhanced by 3D flow, forming appropriate pressure distributions for dewatering construction. The uplift pressure below the pit bottom is controlled within a 25% safety margin to verify the reliability of the design method.

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Huang, Feng, Gui He Wang, and Yu You Yang. "Experimental Study of the Impact of Soil Particles Loss on Soil Settlement in Vacuum Dewatering." Advanced Materials Research 639-640 (January 2013): 935–38. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.935.

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Vacuum method, combined with well dewatering method, has been proved to be an effective way to solve perched water, weak aquifers water and interface residual water problems in underground construction. However, there were not enough researches on soil settlement in vacuum dewatering from soil particle loss perspective which is one of the most critical factors in vacuum dewatering. In order to research the effect of vacuum on soil settlement, two experiments were conducted. The first experiment was designed to simulate well dewatering method without vacuum. As a contrast, the other one was conducted under vacuum pressure. Then the particle size distribution curves of the soil which were obtained from the water respectively drained from the two experiments were analyzed. At the same time, the settlements of soil column were compared. The experiment result shows that the vacuum dewatering method discharges more small particles than well dewatering method, which contributes to the settlement of the soil.

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43

Haberl, R., and Ch Salzer. "Dewatering of Sewage Sludge with Vacuum Assisted Sludge Dewatering Beds." Water Science and Technology 26, no. 9-11 (November 1, 1992): 2273–76. http://dx.doi.org/10.2166/wst.1992.0714.

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The “Rapid Sludge Dewatering System (RSDS)”, in which the sludge is dewatered by way of vacuum supported sludge drying beds, was tested for performance, efficiency and applicability. Generally, the RSD-System can be regarded as an alternative to other sludge dewatering systems, especially for small purification plants, for agricultural use and composting of sewage sludge. It is also applicable for (industrial) sludge with a high percentage of grease or coarse materials.

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Burat, Firat, Ayhan A. Sirkeci, and Güven Önal. "Improved Fine Coal Dewatering by Ultrasonic Pretreatment and Dewatering Aids." Mineral Processing and Extractive Metallurgy Review 36, no. 2 (September 25, 2014): 129–35. http://dx.doi.org/10.1080/08827508.2014.898637.

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Tanzharikov, P. A., N. S. Suleymenov, A. T. Erzhanova, and A. Zh Nasradin. "RESEARCH AND IMPROVEMENT OF OIL FIELD DEWATERING." Bulletin of the Korkyt Ata Kyzylorda University 62-2 (2022): 77–83. http://dx.doi.org/10.52081/bkaku.2022.v62.i3.115.

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A steady increase in the water content of the extracted oil, an increase in the volume of heavy grades of oil with stable emulsions, an increase in the proportion of thick oil in the total volume of refined oil due to the imperfection of the oil dewatering process is far from a complete list of factors determining the importance and relevance of the problem of optimal automatic control of the oil dewatering process in the fields today. Although this problem is not new to the oil industry, its solution is not yet complete. This circumstance is due to insufficient knowledge of the rocesses of oil preparation due to the emerging objective difficulties and the lack of adequate models that could be used to solve the problems of stabilization and optimization of the oil dewatering process. The paper presents the research on the process of breaking highly-stable heavy oil emulsions by water evaporation. An equation has been derived and relevant curves have been plotted to calculate the required heating temperature. This study shows the dependence of hydrocarbon distillate yield on heating temperature, boiling point oil composition and the initial water cut of the emulsion. The technology of oil dehydration has been field tested using oil from.

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Murthy, Sudhir N., John T. Novak, and Robert D. De Haas. "Monitoring cations to predict and improve activated sludge settling and dewatering properties of industrial wastewaters." Water Science and Technology 38, no. 3 (August 1, 1998): 119–26. http://dx.doi.org/10.2166/wst.1998.0189.

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Laboratory and field tests were conducted on activated sludge from an industrial wastewater treatment plant in order to monitor the settling and dewatering properties and to assess the impact cations may have on these properties. The influent to the wastewater treatment plant contained a high concentration of sodium ions and a low concentration of divalent cations. The sludge exhibited poor settling and dewatering properties. Initial laboratory results indicated an improvement in settling and dewatering properties through the addition of calcium and magnesium. After addition of magnesium during field trials, floc density and settling properties improved considerably. In addition, residual ammonium ions in the mixed liquor appeared to interact with the activated sludge flocs to influence their dewatering properties. It was observed that an increase in ammonium ion in the soluble sludge fraction was related to deterioration in the dewatering properties. During these trials, the ammonium ions demonstrated a greater influence on dewatering properties than did the magnesium ions. The tests conducted at the treatment plant revealed that complex interactions between cations and sludge influenced the settling and dewatering properties in a manner that depended on ratios and concentrations of monovalent and divalent cations in the activated sludge feed and solution.

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Ye, X. W., L. Ran, T. H. Yi, and X. B. Dong. "Intelligent Risk Assessment for Dewatering of Metro-Tunnel Deep Excavations." Mathematical Problems in Engineering 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/618979.

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In recent years, China has been undergoing a metro railway construction boom in order to alleviate the urban traffic congestion problem resulting from the rapid urbanization and population growth in many metropolises. In the construction of metro systems, deep excavations and continuous dewatering for construction of the metro tunnels and stations remain a challenging and high risk task in densely populated urban areas. Intelligent computational methods and techniques have exhibited the exceptional talent in dealing with the complicated problems inherent in the deep excavation and dewatering practice. In this paper, an intelligent risk assessment system for deep excavation dewatering is developed and has been applied in the project of Hangzhou Metro Line 1 which is the first metro line of the urban rapid rail transit system in Hangzhou, China. The specific characteristics and great challenges in deep excavation dewatering of the metro-tunnel airshaft of Hangzhou Metro Line 1 are addressed. A novel design method based on the coupled three-dimensional flow theory for dewatering of the deep excavation is introduced. The modularly designed system for excavation dewatering risk assessment is described, and the field observations in dewatering risk assessment of the airshaft excavation of Hangzhou Metro Line 1 are also presented.

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Liu, Bing Tao, Hai Yan Song, and Yun Xia Li. "Effect of Chitosan/Polymeric Aluminum Composite Flocculant on Activated Sludge." Advanced Materials Research 383-390 (November 2011): 3134–39. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3134.

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Effect of the dosage of flocculants on activated sludge dewatering is analyzed through the determination of sludge specific resistance to filtration．Sludge dewatering behaviors conditioned on PAC, CTS and composite flocculants have been compared. The results show all the conditioning agent have help to sludge dewatering .Compared with Polymeric aluminum , Chitosan(CTS) and PAC/CTS composite coagulant, the optimum coagulant with its optimum dosage is obtained .PAC/CTS can greatly reduce the sludge specific resistance and improves the sludge dewatering performance largely while the clarity of the filtrate was higher.

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Li, Zhi Guang, Jian Ma, Yong Jian Cao, and Bai Qing Xu. "Dewatering Efficiency Comparison between Vacuum Tube Well and Normal Tube Well in Silty Clay Layer." Applied Mechanics and Materials 170-173 (May 2012): 41–45. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.41.

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Vacuum Tube Well Dewatering (VTWD) is one of high efficiency methods to vacuum dewatering in Beijing district in recent years. Water output, surrounding drawdown, and land settlement of vacuum and normal tube well respectively were measured during the process of engineering dewatering at three sites in Beijing subway engineering. The results showed that the water output by VTWD was 1.6 to 2 times than that by Normal Tube Well Dewatering (NTWD) while the land settlement was twice compared to NTWD. It is suggested to consider the carrying capacity of surrounding environment when using VTWD.

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Liu, Yan Jun, and Li Zhen Shen. "Numerical Simulation Study on Three-Dimensional Seepage Field of Deep Excavation Dewatering in Thick Aquifer." Applied Mechanics and Materials 353-356 (August 2013): 1305–9. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.1305.

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This article describes the pumping test procedures and test results of the subway project 30m deep excavation dewatering in thick aquifer. A groundwater three-dimensional seepage numerical calculation model is established. We use the model to calculate and compare the calculated results and the actual results, obtain hydrogeological parameters by inversion. Further, we have a numerical simulation study on deep excavation dewatering with the hydrogeological parameters, the Simulation results and excavation pre-dewatering test results are consistent. Test results show that the model can reflect the deep excavation dewatering process with complex geological conditions.

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Journal articles on the topic 'Dewatering'

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