Thematische Bibliographien / Acid water stripping

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Auswahl der wissenschaftlichen Literatur zum Thema „Acid water stripping“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Acid water stripping"

Duan, Ning, Yao Wen Gao, Teng Zhang, Ke Ming Wu und Yin Feng Zhang. „Study on Water-Based Paint Stripper for Tinplate“. Advanced Materials Research 690-693 (Mai 2013): 2071–75. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.2071.

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A novel water-based paint stripper was prepared for white, metallic ink and varnish coated on the tinplate steel surface. The effect of accelerator and surfactant on stripping efficiency was investigated with the types and dosage of the accelerator and surfactant, the stripping temperature and stirring up condition. The highest stripping efficiency was achieved with the stripper composited by (mass fraction) 35% benzyl alcohol, 6% propanediol carbonate, 10% formic acid, 2% cetyl tri-methyl ammonium bromide (CTMAB) and 47% distilled water, respectively. This paint stripper had low volatility, and was not easy to burn. Scanning electron microscopy (SEM) test indicated that the paint stripper had little corrosive effect on tinplates.

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Tao, Wendong, Anayo T. Ukwuani und Fred Agyeman. „Recovery of ammonia in anaerobic digestate using vacuum thermal stripping – acid absorption process: scale-up considerations“. Water Science and Technology 78, Nr. 4 (16.08.2018): 878–85. http://dx.doi.org/10.2166/wst.2018.360.

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Abstract A vacuum thermal stripping process coupled with acid absorption has been developed at laboratory scale to recover ammonia in anaerobic digestate. To make this ammonia recovery process scalable, this study investigated the effects of feed depth on vacuum thermal stripping in a pilot system, developed sodium hydroxide dosages required to raise feed pH for stripping, and simulated the dynamics of ammonia reduction in batch stripping tests. As feed depth was increased from 8.5 to 34.0 cm, the ammonia mass transfer coefficient and ammonia stripping efficiency decreased while the mass of stripped ammonia increased. Digested municipal sludge had a greater ammonia mass transfer coefficient than digested dairy manure at each feed depth, which could be attributed to the difference in suspended and dissolved solids concentrations. The optimum feed depth was 18 cm of the digested sludge and 14 cm of the digested manure. Sodium hydroxide dosage for the digested manure was higher than that for the digested sludge and co-digested foodwaste. The dosages were correlated to concentrations of total dissolved solids and ammonia. Total ammonia concentration decreased exponentially in batch stripping of the digested sludge at 25.5 cm deep, with a first-order stripping rate coefficient of 0.087–0.144 h−1.

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Rajendran, V., S. M. Saufi, M. A. K. Zahari und A. W. Mohammad. „Study on stripping phase conditions on the levulinic acid extraction using supported liquid membrane“. Journal of Mechanical Engineering and Sciences 13, Nr. 3 (27.09.2019): 5625–36. http://dx.doi.org/10.15282/jmes.13.3.2019.25.0451.

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Supported liquid membrane (SLM) is the most effective technique to extract and recover the desired product from the biomass products in a single step. The study of the operation parameters in SLM system is very important to improve the yield of extraction and recovery of the product. In this study, different types of stripping agents such as sodium hydroxide (NaOH), sodium carbonate, hydrochloric acid, trimethylamine, and water were tested in the SLM system to extract levulinic acid (LA). By using 0.3 M trioctylamine in 2-ethyl-1-hexanol as liquid membrane phase, it was found that NaOH was the best stripping agent to extract LA. The concentration of the NaOH stripping agent was varied from 0.25 M to 1 M. The best stripping agent concentration was 0.5 M, which gave an LA extraction of 86% from a 10 g/L LA aqueous solution. The flow rate of the feed and stripping phase was investigated from 25 mL/min to 125 mL/min. SLM operated at 75 L/min was found to be adequate in reducing the boundary layer thickness at both sides of the SLM phases without any leakage of the liquid membrane and breakage of the matrix support. At the best stripping condition, 89% of the LA was extracted using 0.5 M NaOH that operated at flow rate of 75 mL/min.

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Fayyad, Manar. „Indirect trace determination of nitrilotriacetic acid in water by potentiometric stripping analysis“. Analytical Chemistry 59, Nr. 1 (Januar 1987): 209–11. http://dx.doi.org/10.1021/ac00128a046.

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Le Gall, Anne-Christine, und Constant M. G. van den Berg. „Determination of folic acid in sea water using adsorptive cathodic stripping voltammetry“. Analytica Chimica Acta 282, Nr. 3 (Oktober 1993): 459–70. http://dx.doi.org/10.1016/0003-2670(93)80109-x.

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Jagtap, Neha, und Treavor H. Boyer. „Integrated, multi-process approach to total nutrient recovery from stored urine“. Environmental Science: Water Research & Technology 4, Nr. 10 (2018): 1639–50. http://dx.doi.org/10.1039/c8ew00004b.

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Li, S. J., L. Zhang, H. I. Chen, H. Chai und C. J. Gao. „Complex extraction and stripping of H acid wastewater“. Desalination 206, Nr. 1-3 (Februar 2007): 92–99. http://dx.doi.org/10.1016/j.desal.2006.02.061.

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Komy, Z., E. Roekens und R. van Grieken. „Analysis of rain water by differential-pulse stripping voltammetry in nitric acid medium“. Analytica Chimica Acta 204 (1988): 179–87. http://dx.doi.org/10.1016/s0003-2670(00)86357-6.

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Fayyad, Manar, Maha Tutunji und Ziad Taha. „Indirect Trace Determination of Ethylenediminetetraacetic Acid (Edta) in Water by Potentiometric Stripping Analysis“. Analytical Letters 21, Nr. 8 (August 1988): 1425–32. http://dx.doi.org/10.1080/00032718808059874.

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Wang, Jiang-Bo, Rui-Jing Zhang, Zhong-Gui Mao, Dong-Sheng Xue, Zheng-Jun Zhu, Han-Chao Yu, Feng-Jiao Cai, Lin-Yang Cai, Jia-Wei Bao und Jian Xu. „Full recycling of citric acid wastewater through anaerobic digestion, air-stripping and pH control“. Water Science and Technology 80, Nr. 6 (15.09.2019): 1196–204. http://dx.doi.org/10.2166/wst.2019.364.

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Abstract Anaerobic digestion effluent (ADE) from the anaerobic digestion treatment of citric acid wastewater can be reused as a potential substitute for process water in the citric acid fermentation. However, excessive sodium contained in ADE significantly decreases citric acid production. In this paper, the inhibition mechanism of sodium on citric acid fermentation was investigated. We demonstrated that excessive sodium did not increase oxidative stress for Aspergillus niger, but reduced the pH of the medium significantly over the period 4–24 h, which led to lower activities of glucoamylase and isomaltase secreted by A. niger, with a decrease of available sugar concentration and citric acid production. ADE was pretreated by air-stripping prior to recycle and 18 g/L calcium carbonate was added at the start of fermentation to control the pH of the medium. The inhibition caused by ADE was completely alleviated and citric acid production substantially increased from 118.6 g/L to 141.4 g/L, comparable to the fermentation with deionized water (141.2 g/L). This novel process could decrease wastewater discharges and fresh water consumption in the citric acid industry, with benefit to the environment.

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Dissertationen zum Thema "Acid water stripping"

Motyka, Ondřej. „Vybrané projekční práce na procesu stripování kyselých vod“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443223.

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The diploma thesis is focused on selected designing works related to the design of a specific process of acid water stripping. The main purpose of the work is to describe the procedure and the obtained results for these performed design work based on the relevant assignment and the process requirements. In the introductory two chapters, the work focuses on process introduction and description of main process equipment. The following chapters are devoted to the description of the designing works, specifically simulation of the process in CHEMCAD, design calculation of the spiral plate heat exchanger for feed preheating, creation of 3D model and drawing documentation using AutoCAD Plant 3D and lastly strength analysis of the selected pipeline. The main outputs of this work are mainly generated result reports from the process and equipment simulation and strength analysis of the solved pipeline route, 3D model of the process and selected technical and drawing documentation. At the end of the diploma thesis, the performed activities and their outputs are summarized and evaluated.

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Konferenzberichte zum Thema "Acid water stripping"

Dobrevski, Ivan D., und Neli N. Zaharieva. „The Main Changes and Consequences by Burnup Extensions in PWRs: Some Recommendations for Negative Plant Performance Issue Limitations“. In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48099.

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The higher duty cores are always attended with the onset of sub-cooled nucleate boiling (SNB) on the fuel cladding surfaces and the initial excess reactivity of core. The impacts of these factors on the chemical environments of the nuclear fuel cladding- and reactor coolant system- surfaces are discussed: The SNB at the cladding surfaces strongly influences the behavior of gases dissolved in cladding water layer phase, causing their stripping out which will favor the creation of oxidizing conditions. It is considered that the creation of oxidizing conditions in the nuclear fuel cladding environment is not a direct boiling consequence but it is a result of the synergic impact of the boiling- and water radiolysis- processes on the Pressurized Water Reactor fuel cladding surface areas. This requires new criteria for corrosion resistance properties of fuel cladding materials. These materials must have high corrosion resistance to oxidizing conditions. If only boric acid as neutron absorber is implemented, the critical boron concentration in coolant increases significantly when implementing an extended fuel cycle. This effect can be limited through application of 10B enriched boric acid or by application of such solid burnable absorbers as Gd2O3 integrated in UO2 fuel. Some recommendations to address negative plant performance issues are given in addition to the results of these investigations.

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Wei, Meng, Qian’ge He, Xuegang Liu und Jing Chen. „N,N,N′,N′-Tetra-Methyl-3-Oxy-Pentane-1,5-Diamide (TMPDA): A Promising Back Extractant for Ln(III) and Zr(IV)“. In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29358.

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Water-soluble oxa-diamide ligand, N,N,N′,N′-tetra-methyl-3-oxy-pentane-1,5-diamid (TMPDA) has been synthesized and purified. Its crystal structure, melting point, decomposition temperature, solubilities in aqueous phase and organic phase, distribution ratio between aqueous and organic phase, etc. are reported. The effect of TMPDA concentration in aqueous phase and HNO3 concentration in the equilibrium aqueous phase on the extraction efficiency of La(III), Ce(III), Pr(III), Nd(III), Zr(IV), Fe(III), Y(III), Mo(VI), Ru(III) and Pd(II) by 30% TRPO/kerosene have been studied. The results indicate that TMPDA dissolve well in aqueous phase but almost insoluble in kerosene or 30%TRPO/kerosene in the bi-phase system. It can effectively reduce the extraction of Ln(III), Y(III) and Zr(IV) into 30%TRPO/kerosene at a moderate acid system (0.24mol/L∼0.27mol/L HNO3). TMPDA is a promising stripping agent for Ln(III), Y(III) and Zr(IV) from loaded TRPO.

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Wei, J., B. K. Lok, P. C. Lim, M. L. Nai, H. J. Lu, F. K. Lai und C. K. Wong. „Wafer Level Packaging of RF MEMS for Flip Chip Assembly“. In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42825.

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In this paper, the development of wafer level packaging of radio frequency (RF) microelectromechanical system (MEMS) is reported. The packaging process consists of wafer bonding, wafer thinning, via etching, plating, under-bump-metallization (UBM) and bumping processes. 6-inch Si and glass wafers are used in the study. RF MEMS devices are fabricated on Si wafers and sandwiched between Si and glass cap wafers. To maintain the pressure balance between the cavities and outside world after bonding process, Si and glass wafers are anodically bonded at a pressure of 2 bar and a bonding temperature of 400 °C. The cavities are hermetically sealed. The glass wafer of the bonded pair is thinned down to 100 μm using mechanical polishing and chemical etching, the good uniformity of the wafer thickness is maintained with etching process. A layer of Cr/Au is sputtered and patterned as the hard mask for glass via etching process. Via holes with undercut closer to the etching depth are formed in HF+HNO3 acid. After stripping the metal mask, a seed layer of TiW/Cu is deposited using sputtering and plating processes. TiW layer is used to enhance the adhesion of metal and glass. With the completion of the re-routing and via metallization processes, benzocyclobutene (BCB) photoresist is used to planarize via holes and opened for UBM process. Finally, the packaged devices can be assembled using flip chip approach.

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