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Academic literature on the topic 'Autothermal thermophilic aerobic digestion'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Autothermal thermophilic aerobic digestion"

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Jin, Ningben. "The effect of phosphate buffer on improving the performance of autothermal thermophilic aerobic digestion for sewage sludge." RSC Advances 8, no. 17 (2018): 9175–80. http://dx.doi.org/10.1039/c8ra00793d.

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Kovács, R., P. Miháltz, and Zs Csikor. "Kinetics of autothermal thermophilic aerobic digestion – application and extension of Activated Sludge Model No 1 at thermophilic temperatures." Water Science and Technology 56, no. 9 (November 1, 2007): 137–45. http://dx.doi.org/10.2166/wst.2007.706.

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The application of an ASM1-based mathematical model for the modeling of autothermal thermophilic aerobic digestion is demonstrated. Based on former experimental results the original ASM1 was extended by the activation of facultative thermophiles from the feed sludge and a new component, the thermophilic biomass was introduced. The resulting model was calibrated in the temperature range of 20–60 °C. The temperature dependence of the growth and decay rates in the model is given in terms of the slightly modified Arrhenius and Topiwala-Sinclair equations. The capabilities of the calibrated model in realistic ATAD scenarios are demonstrated with a focus on autothermal properties of ATAD systems at different conditions.
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Zábranská, J., M. Dohányos, P. Jeníček, H. Ružičková, and A. Vránová. "Efficiency of autothermal thermophilic aerobic digestion and thermophilic anaerobic digestion of municipal wastewater sludge in removing Salmonella spp. and indicator bacteria." Water Science and Technology 47, no. 3 (February 1, 2003): 151–56. http://dx.doi.org/10.2166/wst.2003.0187.

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The study is focused on the comparison of autothermal thermophilic aerobic digestion, thermophilic and mesophilic anaerobic digestion, based on long term monitoring of all processes in full-scale wastewater treatment plants, with an emphasis on the efficiency in destroying pathogens. The hygienisation effect was evaluated as a removal of counts of indicator bacteria, thermotolerant coliforms and enterococci as CFU/g total sludge solids and a frequency of a positive Salmonella spp. detection. Both thermophilic technologies of municipal wastewater sludge stabilisation had the capability of producing sludge A biosolids suitable for agricultural land application when all operational parameters (mainly temperature, mixing and retention time) were stable and maintained at an appropriate level.
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Mavinic, Donald S., Venkatram Mahendraker, Abyartha Sharma, and Harlan G. Kelly. "Effect of Microaerophilic Conditions on Autothermal Thermophilic Aerobic Digestion Process." Journal of Environmental Engineering 127, no. 4 (April 2001): 311–16. http://dx.doi.org/10.1061/(asce)0733-9372(2001)127:4(311).

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Zupanèiè, Gregor D., Viktor Grilc, Milenko Roš, and Nataša Uranjek-Ževart. "Municipal waste sludge digestion in an autothermal aerobic sequencing batch reactor." Water Science and Technology 58, no. 6 (October 1, 2008): 1237–43. http://dx.doi.org/10.2166/wst.2008.351.

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An autothermal aerobic sequencing batch process for sludge digestion and “class A” biosolids production was developed. The process was tested in laboratory and pilot scale size up to 150 PE, which can be considered a full scale size in some cases. In this process the maximum temperatures of 61.2°C and 60.2°C were achieved in laboratory scale in pilot scale equipment, respectively. The degradation efficiency of total chemical oxygen demand of sludge was between 50 and 70%. Similar results were achieved using pure oxygen in laboratory scale and oxygen/air mixture 1:1 by volume. The reactor scale greatly affects the achievement of thermophilic temperature. In smaller sizes the convective heat losses are the prevailing heat sink and the process is unable to produce enough heat to reach thermophilic temperature. Larger systems produce excess heat and can be installed with less intense aeration systems. The limit of air aeration system is at the size of about 500 PE.
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Bartkowska, Izabela, Paweł Biedka, and Izabela Anna Talalaj. "Autothermal Thermophilic Aerobic Digestion of Municipal Sewage Sludge in Poland. Review." Proceedings 51, no. 1 (July 15, 2020): 12. http://dx.doi.org/10.3390/proceedings2020051012.

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This paper presents the process of autothermal thermophilic aerobic digestion (ATAD). The installations used in municipal sewage treatment plants in Poland were reviewed. The adopted solutions for sludge management and parameters of operating installations were presented. Attention was also drawn to the energy consumption of the process. On the basis of research carried out in the years 2003–2019 in the plants in question, the characteristics of sludge after the ATAD process were presented. The parameters that determine the usefulness of the sludge as an organic fertilizer are indicated above all.
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Sridevi Dhanarani, T., C. Shankar, P. Prakash, T. K. Poornima Priyadharshani, and K. Thamaraiselvi. "Conversion of poultry litter into class A biosolids using autothermal thermophilic aerobic digestion." Management of Environmental Quality: An International Journal 27, no. 1 (January 11, 2016): 4–14. http://dx.doi.org/10.1108/meq-05-2015-0073.

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Purpose – The purpose of this paper is to minimize environmental problems related to raw poultry manure application by stabilizing its nutrient and organic matter (OM) content. This can be achieved by prior digestion before its application to agricultural soils. Design/methodology/approach – In the present study, changes in physicochemical and microbial properties of poultry litter were studied in order to evaluate the suitability of using the digested (stabilized) product for soil amendment. The poultry litter was digested in autothermal thermophilic aerobic digestor (ATAD) where organic solids were degraded and the heat released during the microbial degradation was used to maintain the thermophilic temperatures ( < 50ºC) at a hydraulic retention time of about 3 d. Findings – Results of this study showed that the poultry litter undergoes physicochemical and microbial changes similar to other digestion systems; these changes include self-heating, relative increase in Cu, Zn, Fe, Mn, P, K and NO3-N and decrease in microbial population numbers, C, OM and NH4-N contents. Originality/value – ATAD is an effective method for the conversion of poultry litter into organic fertilizer, which can be readily applied to the agriculture land. ATAD is an eco-friendly, cost effective method which also reduces the length of stabilization.
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Cheng, Jie Hong, Yan Yan Zhang, Nan Wen Zhu, and Shu Gen Liu. "The Study of Sludge Characteristics for One-Stage Autothermal Thermophilic Aerobic Digestion Process." Advanced Materials Research 236-238 (May 2011): 437–40. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.437.

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One-stage Autothermal Thermophilic Aerobic Digestion was autonomously designed to treat municipal sludges. By the way of batch operation experiment, the influence of removal rates of volatile suspended solids(VSS), total suspended solids(TSS), auto-rise temperature, and COD concentration, volatile fatty acid concentration of sludge, were investigated respectively. The results showed that a large part of reactor temperature was in thermophilic statues at 56°C-60°C during sludge digestion period; Municipal sludges treated have achieved stabilization standard of 503 articles of EPA while removal rates of VSS and TSS at 38.9% and 31% respectively for 360h retention time. Resulting from micro-organisms hydrolysis reaction, total COD concentration of sludge supernatant (SCOD) was increased firstly and then dropped afterward during the process of digestion while total COD concentration of solid phase of sludge(TCOD) still fall down with removal rate of TCOD at 35.6% for 360h retention time. A sum of concentration of volatile fatty acid(VFA) was accumulated gradually in the sludge supernatant at 2745mg/L for 360h retention time because of micro-aerobic situation in the beginning of digestion process, and can be use as the carbon sources for wastewater treatment process.
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Ahn, Hee K., and Hong L. Choi. "Piggery Slurry Composting Using Batch Operating Autothermal Thermophilic Aerobic Digestion System." Asian-Australasian Journal of Animal Sciences 19, no. 2 (December 7, 2005): 273–79. http://dx.doi.org/10.5713/ajas.2006.273.

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Staton, Kevin L., James E. Alleman, Richard L. Pressley, and Jim Eloff. "2nd Generation Autothermal Thermophilic Aerobic Digestion: Conceptual Issues and Process Advancements." Proceedings of the Water Environment Federation 2001, no. 1 (January 1, 2001): 1484–95. http://dx.doi.org/10.2175/193864701784993182.

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Dissertations / Theses on the topic "Autothermal thermophilic aerobic digestion"

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Mottola-Lugo, Luciana. "SMALL DECENTRALIZED AUTOTHERMAL THERMOPHILIC AEROBIC DIGESTION FOR PATHOGEN REDUCTION." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/1025.

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The current research relates to a system driven by renewable energy and chemical energy contained in the feed, which will eliminate and reduce pathogens found in human excreta. A project in the form of an experiment for demonstration will be designed and built to operate in the local waste water treatment plant. Data will be analyzed and recorded, including fecal coliforms and E.coli levels, chemical oxygen demand (COD) and total solids removal (TS). The effectiveness of the system will depend upon results obtained and weather conditions. The principal objective of the research is to test and demonstrate that the "Small Decentralized ATAD" is successful in removing/eliminating enteric pathogens found in human excreta. Most importantly, the Bill and Melinda Gates Charity Foundation is providing financial support (Grants) for new sanitation ideas to help developing countries overcome diseases, specifically water borne diseases and also diseases related to hygiene and sanitation. Moreover, the "Water, Sanitation & Hygiene: Grand Challenges Explorations" granted a $100,000 Grant to Professor James Blackburn from Southern Illinois University at Carbondale in the Mechanical Engineering and Energy Processes Department. Consequently, the "Decentralized Next Generation for Diarrheal Pathogens" project will be tested using the ATAD (Autothermal Thermophilic Aerobic Digestion) to demonstrate its effectiveness in pathogen reduction and elimination.
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Ugwuanyi, Jeremiah Obeta. "Aerobic thermophilic digestion of model agricultural wastes." Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366924.

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McIntosh, Karen Bonnie. "Volatile fatty acid production during thermophilic aerobic digestion pre-treatment." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0004/MQ32185.pdf.

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Parsons, Bonita Grace. "Impacts of temperature and hydraulic retention tie on odours produced from authothermal thermophilic aerobic digestion." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2734.

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Five different combinations of Hydraulic Retention Times (HRT) and temperatures were used in a two stage (feed and test reactor) Autothermal Thermophilic Aerobic Digestion System to assess the impact of these parameters on the production of odorous gases. The gases monitored were hydrogen sulphide, dimethyl sulphide, methyl mercaptan, ammonia, and amines. Other liquid parameters were also monitored in order to better understand the impacts of temperature and HRT. These parameters are total solids content, volatile solids content, volatile solids destruction, specific oxygen uptake rate, alkalinity, ammonia concentration, and pH. In order to assess the character of the sludge and understand the digestion process the carbohydrate, fat, and protein content were also measured in the inputs and in the test reactor. It was found that all of the odorous compounds measured were affected by stage of digestion and temperature more than by HRT. Of the five compounds monitored, none were affected by changes in the HRT of the test reactor. However, the concentrations measured in the feed and test reactors were often a degree of magnitude apart. The reduced sulphur compounds (hydrogen sulphide, methyl mercaptan, and dimethyl sulphide) were found in higher concentrations in the feed reactor than in the test reactor; whereas ammonia and amines were found in much higher concentrations in the test reactor than in the feed reactor. Also, ammonia concentrations were significantly higher in both reactors when the temperature was higher; and amine concentration was higher in the test reactor when the temperature was higher. One set of tests for volatile fatty acid concentration was also undertaken. While breakdown of the carbohydrates and fats occurred throughout the process, proteins were broken down into their amino acids, releasing reduced sulphur compounds in the feed reactor and then deaminated, releasing ammonia and amines in the test reactor.
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Agarwal, Saurabh. "Conditioning and Dewatering Behavior of ATAD Sludges." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/31480.

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Autothermal thermophilic aerobic digestion (ATAD) of sludge has been used to produce class A biosolids. With stringent EPA guidelines, more and more municipalities are looking to use this process for digestion of sludge. However the large polymer costs associated with dewatering these sludges has made the use of this technology unfavorable. Several studies have been conducted in the past which have looked into the mechanism leading to such a poor dewatering of sludge. Some of these studies have attributed the release of protein and polysaccharide during the high temperature digestion to be responsible for the poor dewatering. However the exact mechanism leading to the poor dewatering is still not totally clear. Laboratory scale studies were conducted to evaluate the mechanism leading to the poor dewatering of these sludges and also to be able to economically condition these sludges. ATAD sludge samples were collected from ATAD processing facilities in Ephrata, PA, Cranberry, PA, Titusville, FL and College Station, TX. The research included experiments evaluating the protein and polysaccharide concentrations in solution, cations and anions, iron and aluminum, zeta potential and capillary suction time. It was found that during digestion large amounts of protein and polysaccharide were released which were in the colloidal range, and the dewatering of each of these sludges became poorer as the amount of protein and polysaccharide in the solution increased. The release of protein and polysaccharide was related to the monovalent to divalent cation ratio and the iron and aluminum concentration in the sludge. Also during the digestion process, the pH of the sludge increased appreciably and the divalent cations precipitated out. The zeta potential of the ATAD digested sludge was also found to be positive. Different chemical coagulants were used to condition the sludge, but even with high polymer doses the dewatering of the sludge was not satisfactory. A combination of iron (or cationic polymer) followed by anionic polymer was found to improve the dewatering to a desired level. The use of this combination of sludge conditioning also provides an economical solution to the problem of dewatering. The role of iron in improving the dewatering of the sludges was found to be important, with the sludge dewatering being better for sludges with a high iron content. The combination of high pH, divalent cation precipitation, iron deficiency and biopolymer release all contribute to the poor dewatering of ATAD sludge.
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Chu, Angus. "Volatile fatty acid metabolism in thermophilic aerobic digestion of sludge." Thesis, 1995. http://hdl.handle.net/2429/7219.

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The efficacy of Volatile Fatty Acid (VFA) production in Thermophilic Aerobic Digestion (TAD) of primary sludge was investigated. This research program was carried out in a pilot scale, TAD process, located in the wastewater treatment pilot plant site, at the University of British Columbia. Preliminary results showed that the highest accumulation of VFA (950 mg/L as acetate) had occurred, under microaerobic conditions (air flow rate of between 0-0.17 V/V-h), in the first stage of the 150 L, 2-stage process. The two other aeration conditions examined (transition-air flow rate of 0.28 V/V-h and aerobic-air flow rate of 0.6 V/V-h) accumulated negligible amounts of VFA. Therefore, the subsequent research concentrated on the first stage of the TAD process, under microaerobic conditions. The two independent variables examined were air flow rates and solids retention times (SRT). The three SRTs tested were 3, 4.5 and 6 days. The four air flow rates examined were assigned the labels true anaerobic, low flow microaerobic, medium flow microaerobic and high flow microaerobic conditions. Net VFA production was found to be a function of both aeration and SRT. In general, as SRT and air flow rates decreased, net VFA production increased (specifically acetate and propionate). The measured concentration of any species of VFA, at any given time, was a function of both the relative rates of its synthesis and biodegradation. Decreasing or increasing the aeration rate and/or SRT resulted in a proportional change in VFA accumulation. The maximum measured acetate accumulation rate occurred under the 4.5 d SRT and the true anaerobic condition. A biochemical model was developed in order to explain the process of VFA metabolism in TAD. In this process, under strict anaerobic conditions, bacteria must achieve oxidation/reduction balance by diverting the catabolic flow of carbon to fermentative end products (eg. propionate) that will consume NADH (Nicotinamide Adenine Dinucleotide). The key issue in fermentation is the recycling of NADH by the conversion of specific intermediates to different fermentation products which regenerate NAD⁺. The oxidation of intermediates that required the net reduction of NAD⁺ cannot proceed under fermentative conditions. Consequently, these catabolic intermediates added under batch test conditions, using TAD sludge, under anaerobic conditions, remained in their unoxidized form and persisted in the medium. The oxidation of intermediates which required no net reduction of NAD⁺ can and did proceed under fermentative conditions. Under strict anaerobic conditions, the VFA profiles in the pilot scale TAD process were similar to fermentation type processes (eg. an even distribution of VFA between acetate and propionate). When the bioreactors were operated under microaerobic conditions (ie. oxygen demand is greater than oxygen supply), metabolism resulted in a characteristic VFA distribution profile with acetate as the predominant VFA produced (up to 80% of the total VFA). Propionate constituted the second largest fraction at 11%. Under this microaerobic condition, the NADH produced during oxidation of substrates could be reoxidized by operation of the respiratory chain. Therefore, the carbon flow could be uncoupled from the necessity to maintain redox balance via fermentative means. This separation would presumably allow the organisms in a TAD process to maximize ATP (adenosine triphosphate) production by increasing the flux of intermediates to acetate. The majority of the substrates examined under batch test conditions, with TAD process biomass, under microaerobic conditions, were oxidized to an acetate intermediate.
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Wu, Yeong-Shing, and 吳勇興. "DEVELOPING ALGORITHMS FOR THE DETERMINATION OF SYSTEM PARAMETERS ON THE AUTOTHERMAL THERMOPHILIC AEROBIC TREATMENT." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/37499589190791452554.

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博士
國立中興大學
環境工程學系
92
The autothermal thermophilic aerobic treatment (ATAT) is a biological process in which the operating temperature can be maintained spontaneously at 45 — 65 oC. Comparing with the activated sludge process (ASP), the ATAT produces significantly less excess sludge yet proceed at higher reaction rate. However there is a need of developing evaluation tools for heat and kinetic analysis for the ATAT system. This study aims to develop mathematical and laboratory procedure for the determination of specific biological heat potential (hb, cal/(g Ou)) and kinetic parameters for the ATAT system. In order to verify these procedures, this study conducts respirometric tests and analyzes data collected from full-scale ATAT operation. Three kinetic algorithms and two hb algorithms are proposed for this study: (1) respirometric batch kinetic algorithm, (2) respirometric serial dilution kinetic algorithm, (3) respirometric graphical kinetic algorithm, (4) respirometric hb algorithm, and (5) full-scale hb algorithm. Based on the Monod kinetics, this study first develops a two-phase model for analyzing a batch OUR vs. Ou respirogram. An algorithm is then proposed to determine the four Monod kinetic parameters (mm, Yg, Ks, and kd) and the initial seed (Xo) and substrate (So) concentration. The algorithm is illustrated by a respirometric test on glucose of 10,000 mg/L COD at a temperature of 55oC. The result shows a maximal specific growth rate (mm) of 6.37 1/d, gross growth yield (Yg) of 0.84 mg BOD of X/mg BOD of S, half-saturation constant (Ks) of 82.3 mg/L BOD, and decay coefficient (kd) of 0.44 1/d for the ATAT system. This study also develops a respirometric serial dilution kinetic algorithm. The procedure requires only one batch test, using a series of substrate concentration (So) at the same seeding dosage (Xo). The algorithm can be used to determine for the type of kinetic model (Haldane vs. Monod) based on testing results with that the corresponding kinetic parameters can be assessed. In addition, the algorithm can determine a ratio of biodegradability (bBOD/ThOD) of the substrate. A test is conducted on para-hydroxybenzoic acid (PHBA) as the substrate at various concentrations. The result shows a biodegradability ratio (bBOD/ThOD) of 1.38 mg BOD/mg ThOD and observed growth yield (Yo) of 0.16 BOD of X/ BOD of S. It further determines that the Michaelis-Menten model is more appropriate with a km of 1.3 1/hr and Ks of 12 mg/L BOD. The bBOD/ThOD is greater than 1, which may be caused by the nitrification of NH4Cl being added as a nutrient for that nitrification inhibitor (TCMP) is not used. The graphical algorithm offers another solution for kinetic parameter estimation based on OUR vs. Ou respirograms, which can also be used for the diagnosis of respirometer tests. This study performs a respirometric test on glucose-glutamic acid (GGA) at three different seeding sources. The result shows that seeding source and the mixing intensity are two major factors affecting the pattern of respirogram. Other factors include the diversity of microbial consortium, the homogeneity of seeding, and the substrate residual carried over from seeding materials. This study attempts to develop a bio-calorimeter capable of simultaneous measuring of accumulative heat compensation data (Hc vs. t) and oxygen uptake data (Ou vs. t) so that the hb of a given substrate can be experimentally determined. A test is conducted on glucose of 10,000 mg/L COD, yielding an average hb of 51.4 kcal/(g Ou) with a large variation coefficient (Cv) of 80%. The estimated hb is much higher than the value of 3.4 — 3.5 kcal/(g Ou) reported by previous researchers. An analysis by computer aided design (CAD) program indicates that the errors are likely associated with high compensating heater power (100 W), poor precision of temperature probe (±0.25oC), less frequent on/off temperature control (0.5 1/s), and high operating temperature (> 45oC) making the oxygen sensor malfunction. It is suggested further study be made for improvement. For full-scale application, this study also develops a heat balance model for assessing hb and system analysis based on daily operating data of temperature (Tt), COD of influent (Si,COD) and effluent (Se,COD), biomass concentration (Xt,SS), and effluent solids (Xe,SS). A case study is analyzed using 6-month daily operating data of a full-scale ATAT plant located at north part of Taiwan. The plant was verified to be definitely autothermal for that the biological heat rate (Jb) was determined to be the major source (89.1%) for heating the influent at 29oC to the reaction temperature of 48oC. The result shows that increasing the sludge retention time (SRT), the oxygen transfer efficiency (OTE), and the influent temeperature (Tw) and concentration (Si,COD) can all increase the autothermal temperature (Tt). The analysis also indicates that, providing an oxygen transfer efficiency (OTE) of 20% and SRT of 30 d, the influent substrate should be at least 6,000 and 9,000 mg/L COD to maintain the operating temperature of 45oC and 50oC, respectively.
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Chiang, Po-Yi, and 江柏毅. "Treatment of Wasted Activated Sludge with a Thermophilic Aerobic Digestion System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/32273385728767659797.

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碩士
國立中興大學
環境工程學系所
101
The activated sludge process is the most widely used biological treatment process for municipal and organic industrial wastewaters treatment, But the major by-product of this process is waste activated sludge (WAS). The treatment and disposal of WAS accounted for about half, even 60%, of the total wastewater treatment cost. Thermophilic aerobic digestion (TAD) is a process being operated at 45-65℃ in the aerobic condition. Also, a considerable amount of heat would be released during the aerobic biological process which can make autothermal thermophilic aerobic digestion an economically viable option. USEPA assessed the autothermal thermophilic aerobic digestion (ATAD) was a feasible process on the sludge digestion. ATAD process also demonstrated its major merits on the high biosolids mass reduction, acceptable PFRP (process to further reduce pathogens) performance, and high digestion rates. In this study, the thermophilic aerobic membrane bioreactor, with a volume of 25 L, was operated at 55℃. Initially, a mixed thermophilic bacterial culture was acclimated with the influent substrate of 10,000 mg-COD/L which was made of glutamic acid and sucrose. When the system reached steady state, the same concentration of the glutamic acid, sucrose and wasted sludge were substituted for the influent substrate. In addition, this study embloyed different batch test to obtain factors affecting sludge degradation and operations. Furthermore, PCR-DGGE was applied to determine the microbial communities of mixed culture in the bioreactor. The results showed that the average removal efficiency of SCOD was 86% and the cofficient of growth (Y) was 0.17 mg-cell/mg-COD when treated with high concentration organic wastewate. That confirmed the thermophilic aerobic digestion system had exhibited considerable advantages for the treatment of high-strength wastewater and low sludge production. When the influent substrate was made of glutamic acid, sucrose and wasted sludge, the results showed that the removal efficiency of TCOD, MLSS and SCOD were up to 28、10 and 71% respectivily. After mixing the thermophilic bacteria which were taken from different sources to digest the WAS, the result showed that the removal efficiency of MLSS and MLVSS were up to 27 and 38% at 25 days.
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Cheng, Chin-Heng, and 鄭欽恆. "A study of sewage sludge reduction by using thermophilic aerobic digestion." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/m4657u.

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碩士
國立臺北科技大學
環境規劃與管理研究所
95
As the more popular sewerage treatment system, the more sludge produced in Taiwan. Depending on the characteristics of organic sludge, this study researches the properties of thermophilic aerobic digestion by innovative technologies developed. In this process, the excess activated sludge is reduced in two stages : (1) A part of the returned sludge is solubilized with enzyme secreted from the thermophilic bacteria in the S-TE reactor. This enhances the bio-degradability of the return sludge. (2) The solubilized return sludge is then decomposed and mineralized by the activated sludge microorganisms in the aeration tank. The focus is about the properties of thermophilic aerobic digestion applying in sewage by S-TE process. The experiments includes two parts: one is pre-heat at the level of 60~65℃, and find out the efficiency of disintegration cell well. The other is thermophilic aerobic digestion. The results show that the most advantageous temperature for microorganism is 60~65℃. In addition, dissolve COD twice as which not be 360 min agitating, indicate agitating help for the efficiency of disintegration. The results also show that removal efficiency in batch digestion of SS, VSS and CODss are 53.7％, 64.3％ and 63.3％. removal efficiency in semi-continuous digestion efficiency of SS, VSS and CODt are 30.2％, 50.4％ and 24.8％. Overall sludge broken and thermophilic aerobic digestion are positive help.
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Yeh, Chun-Feng, and 葉俊鋒. "A Kinetic Study of Municipal Sewage Sludge by Using Thermophilic Aerobic Digestion." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/kcxszs.

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碩士
國立臺北科技大學
環境工程與管理研究所
97
In order to improve environmental quality, Taiwan’s government makes more effort on building sewerage systems construction. These operating sewerage systems will lead to an important increase in sewage sludge production .Due to the limitation of landfall site, municipal sewage sludge disposal will become a hot issue in the future. The purposes of this study was to carry out the comparison the different of the ultrasounds and untreated sludge, moreover the kinetic analytic integrated with thermophilic aerobic digestion process were also be discussed. The aim of ultrasounds is to solubilise and/or to reduce the size of organic compounds, and especially refractory compounds, in order to make them more easily biodegradable. Final quantity of residual sludge and time of digestion can thus be reduced. The objective of pretreatment is to increase reduction efficiency of thermophilic aerobic digestion. The characteristics of thermophilic aerobic digestion process include three parts: (1) increase in organic sewage sludge reduction (2) sludge retention time can be reduced (3) biosolids may be totally contained until they are stabilized. The characteristics of sludge dynamics was also studied and the dynamics model can be utilized to (1) understand the changing of sewage quality and the operational conditions of sewage treatment; (2) lower the cost of sewage treatment (3) support management policies and help to evaluate new sewage treatment design, and shorten the designing time. The experiment includes two parts. The first is pretreatment of sludge using ultrasounds, and find out the efficiency of disintegration cell well. The second stage takes substrate concentration before and after digestion to derive the indecomposable ratio. Inserting the number into the Monod equation, μmax and Ks was obtained. From the result of this experiment, the digestion dynamics coefficient, and the comparison to references, it was demonstrated that the 4 experimental groups, there were (Ks) 8410, 978, 198, 4340 mg/L separately. We suspect the reason that a high Ks was achieved with the combination of thermophiles and ultrasound irradiation is that the experiment was partial continuous and the air sparging mixer was not automated.This was only observed in a combination of thermophiles and ultrasound irradiation. The result demonstrates that ultrasound irradiation in combination with high temperature digestion can increase Ks and the microbes in sludge, enabling a better decomposition of substrate.
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Books on the topic "Autothermal thermophilic aerobic digestion"

1

Palfrey, R. N. The thermophilic aerobic/mesophilic anaerobic sludge digestion process. Swindon: Foundation for Water Research, 1993.

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2

M, Bruce A., Colin F, Newman P. J, and Commission of the European Communities., eds. Treatment of sewage sludge: Thermophilic aerobic digestion and processing requirements for landfilling. London: Elsevier Applied Science, 1989.

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United States. Environmental Protection Agency. Office of Research and Development, ed. Environmental regulations and technology: Autothermal thermophilic aerobic digestion of municipal wastewater sludge. Washington, DC: U.S. Environmental Protection Agency, Office of Research and Development, 1990.

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Bruce, A. M., and F. Colin. Treatment of Sewage Sludge: Thermophilic Aerobic Digestion and Processing Requirements for Landfilling. Elsevier Applied Science, 1989.

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Book chapters on the topic "Autothermal thermophilic aerobic digestion"

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Paulsrud, B., and K. T. Nedland. "Full Scale Experiences with Thermophilic Aerobic Digestion of Primary-Chemical Sewage Sludge." In Chemical Water and Wastewater Treatment III, 329–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-79110-9_25.

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Capón-García, Elisabet, Jaime Rojas, Toshko Zhelev, and Moisès Graells. "Operation scheduling of batch autothermal thermophilic aerobic digestion processes." In Computer Aided Chemical Engineering, 1177–82. Elsevier, 2010. http://dx.doi.org/10.1016/s1570-7946(10)28197-x.

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Vaklieva-Bancheva, Natasha G., Elisaveta G. Kirilova, and Raika K. Vladova. "Capturing Uncertainties for Sustainable Operation of Autothermal Thermophilic Aerobic Digestion Systems." In Computer Aided Chemical Engineering, 1729–34. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-444-63455-9.50123-9.

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Grigorieva, Ellina, Natalia Bondarenko, Evgenii Khailov, and Andrei Korobeinikov. "Finite-Dimensional Methods for Optimal Control of Autothermal Thermophilic Aerobic Digestion." In Industrial Waste. InTech, 2012. http://dx.doi.org/10.5772/36237.

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Rojas, Jaime, and Toshko Zhelev. "Energy Efficiency Advancements in Wastewater Treatment – Study of Autothermal Thermophilic Aerobic Digestion." In Computer Aided Chemical Engineering, 1269–73. Elsevier, 2009. http://dx.doi.org/10.1016/s1570-7946(09)70211-1.

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Kirilova, Elisaveta, Rayka Vladova, and Natasha Vaklieva-Bancheva. "Multiscenario Approach for Capturing Uncertainties in Energy-Integrated Autothermal Thermophilic Aerobic Digestion Systems." In Soft Computing Techniques in Solid Waste and Wastewater Management, 469–89. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-824463-0.00007-0.

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LaPara, Timothy M., and James E. Alleman. "Autothermal Thermophilic Aerobic Waste Treatment Systems: A State-of-the-Art Review." In Proceedings of the 52nd INDUSTRIAL WASTE CONFERENCE May 5–7, 1997, 25–34. CRC Press, 2020. http://dx.doi.org/10.1201/9780367813291-5.

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Conference papers on the topic "Autothermal thermophilic aerobic digestion"

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Kelly, Harlan G., Wayne Urban, and Roger Warren. "Design Considerations for Autothermal Thermophilic Aerobic Digestion." In World Water and Environmental Resources Congress 2005. Reston, VA: American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40792(173)110.

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Liu, Jingming, Jian Lin, Yanyan Chen, Zhirong Zhu, and Ji Ma. "Study on Pretreatment and Kinetics of Waste Klebsiella Pneumoniae by the Autothermal Thermophilic Aerobic Digestion Process." In 2011 International Conference on Measuring Technology and Mechatronics Automation (ICMTMA). IEEE, 2011. http://dx.doi.org/10.1109/icmtma.2011.696.

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Whitaker, Dawn R., and James E. Alleman. "Evaluation of Thermophilic Aerobic Digestion for Waste Treatment." In International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-3095.

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Cheng, Jie Hong, and Nan Wen Zhu. "Effect of Atuothermal Thermophilic Aerobic Digestion Operation on Reactor Temperatures." In 2008 2nd International Conference on Bioinformatics and Biomedical Engineering (ICBBE '08). IEEE, 2008. http://dx.doi.org/10.1109/icbbe.2008.312.

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