The Experts below are selected from a list of 54510 Experts worldwide ranked by ideXlab platform
Szukung Tseng - One of the best experts on this subject based on the ideXlab platform.
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dechlorination of trichloroethylene by immobilized autotrophic hydrogen bacteria and zero valent iron
Journal of Bioscience and Bioengineering, 2009Co-Authors: Shangming Wang, Szukung TsengAbstract:The efficiency of removing trichloroethylene (TCE) using co-immobilized zero-valent iron and autotrophic hydrogen-bacteria has been studied in this research. Laboratory results show that the combined physicochemical and Biological system is much superior to either physicochemical or Biological system alone in dechlorination of TCE. In addition to catalyzed hydrogenolysis reactions occurring between hydrogen gas and zero-valent iron particle surface, as well as autotrophic dechlorination of hydrogen-bacteria, the FeS produced by sulfate-reducing bacteria also contributes to the catalytic dechlorination mechanisms. In the presence of hydrogen gas, corrosion of iron powder is somewhat alleviated, thus extending the useful life of iron powder for treating pollution. The results of membrane feeding substrate bioreactor (MFSB) reveal that the TCE removal rate of the combined system is 3.5 times faster than the zero-valent iron Method, and 5 times faster than the Biological Treatment Method in removing TCE. The potential of using co-immobilized zero-valent iron and autotrophic hydrogen-bacteria to clean up sites contaminated by chlorinated hydrocarbons is demonstrated by the results presented in this paper.
Chandrajit Balomajumder - One of the best experts on this subject based on the ideXlab platform.
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cyanide in industrial wastewaters and its removal a review on bioTreatment
Journal of Hazardous Materials, 2009Co-Authors: Rajesh Roshan Dash, Abhinav Gaur, Chandrajit BalomajumderAbstract:Cyanides are produced by certain bacteria, fungi, and algae, and may be found in plants and some foods, such as lima beans and almonds. Although cyanides are present in small concentrations in these plants and microorganisms, their large-scale presence in the environment is attributed to the human activities as cyanide compounds are extensively used in industries. Bulk of cyanide occurrence in environment is mainly due to metal finishing and mining industries. Although cyanide can be removed and recovered by several processes, it is still widely discussed and examined due to its potential toxicity and environmental impact. From an economic standpoint, the Biological Treatment Method is cost-effective as compared to chemical and physical Methods for cyanide removal. Several microbial species can effectively degrade cyanide into less toxic products. During metabolism, they use cyanide as a nitrogen and carbon source converting it to ammonia and carbonate, if appropriate conditions are maintained. Biological Treatment of cyanide under anaerobic as well as aerobic conditions is possible. The present review describes the mechanism and advances in the use of Biological Treatment for the removal of cyanide compounds and its advantages over other Treatment processes. It also includes various microbial pathways for their removal.
Shiming Lan - One of the best experts on this subject based on the ideXlab platform.
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immobilizing of heavy metals in sediments contaminated by nonferrous metals smelting plant sewage with sulfate reducing bacteria and micro zero valent iron
Chemical Engineering Journal, 2016Co-Authors: Chang Zhang, Yunguo Liu, Guangming Zeng, Xinquan Tang, Lihua Dai, Shiming LanAbstract:Abstract Biological Treatment Method using sulfate reducing bacteria (SRB) is considered as the most promising alternative for heavy metals stabilization and immobilization due to its low cost and high efficiency. In this study, a series of immobilization experiments were conducted with heavy metals contaminated aquifer sediment under three conditions: combined micro zero valent iron with sulfate reduction bacteria (mFe 0 + SRB), individual sulfate reduction bacteria (SRB) and micro zero valent iron (mFe 0 ) only. The aim of this study was to investigate the immobilization efficiency of Cu, Cd, Zn and Pb under these three conditions (mFe 0 + SRB, SRB, mFe 0 ). The results presented that the leaching test performance of mFe 0 + SRB was much better than the contrast tests, the removal efficiencies of Cu, Cd, Zn and Pb (mFe 0 + SRB) were 100%, 98.5%, 90.69%, 100%, respectively. The heavy metal stability of the treated sample was also evaluated with sequential metal extractions experiments, Cu, Cd, Zn and Pb were found to form more stable mineral phases (for example, residual fraction and oxidizable fraction) in mFe 0 + SRB conditions. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the mineral phases of treated sediment. According to XRD and XPS characterization, heavy metal may existed in the form of FeO, FeOOH, PbCd, PbZn, ZnS, Zn, CdO, CuZn, and CuS. This study demonstrates that mFe 0 + SRB could be considered as an efficient way for immobilization of multi heavy metals polluted sediment dredged from Xiawangang River.
Shangming Wang - One of the best experts on this subject based on the ideXlab platform.
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dechlorination of trichloroethylene by immobilized autotrophic hydrogen bacteria and zero valent iron
Journal of Bioscience and Bioengineering, 2009Co-Authors: Shangming Wang, Szukung TsengAbstract:The efficiency of removing trichloroethylene (TCE) using co-immobilized zero-valent iron and autotrophic hydrogen-bacteria has been studied in this research. Laboratory results show that the combined physicochemical and Biological system is much superior to either physicochemical or Biological system alone in dechlorination of TCE. In addition to catalyzed hydrogenolysis reactions occurring between hydrogen gas and zero-valent iron particle surface, as well as autotrophic dechlorination of hydrogen-bacteria, the FeS produced by sulfate-reducing bacteria also contributes to the catalytic dechlorination mechanisms. In the presence of hydrogen gas, corrosion of iron powder is somewhat alleviated, thus extending the useful life of iron powder for treating pollution. The results of membrane feeding substrate bioreactor (MFSB) reveal that the TCE removal rate of the combined system is 3.5 times faster than the zero-valent iron Method, and 5 times faster than the Biological Treatment Method in removing TCE. The potential of using co-immobilized zero-valent iron and autotrophic hydrogen-bacteria to clean up sites contaminated by chlorinated hydrocarbons is demonstrated by the results presented in this paper.
Rajesh Roshan Dash - One of the best experts on this subject based on the ideXlab platform.
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cyanide in industrial wastewaters and its removal a review on bioTreatment
Journal of Hazardous Materials, 2009Co-Authors: Rajesh Roshan Dash, Abhinav Gaur, Chandrajit BalomajumderAbstract:Cyanides are produced by certain bacteria, fungi, and algae, and may be found in plants and some foods, such as lima beans and almonds. Although cyanides are present in small concentrations in these plants and microorganisms, their large-scale presence in the environment is attributed to the human activities as cyanide compounds are extensively used in industries. Bulk of cyanide occurrence in environment is mainly due to metal finishing and mining industries. Although cyanide can be removed and recovered by several processes, it is still widely discussed and examined due to its potential toxicity and environmental impact. From an economic standpoint, the Biological Treatment Method is cost-effective as compared to chemical and physical Methods for cyanide removal. Several microbial species can effectively degrade cyanide into less toxic products. During metabolism, they use cyanide as a nitrogen and carbon source converting it to ammonia and carbonate, if appropriate conditions are maintained. Biological Treatment of cyanide under anaerobic as well as aerobic conditions is possible. The present review describes the mechanism and advances in the use of Biological Treatment for the removal of cyanide compounds and its advantages over other Treatment processes. It also includes various microbial pathways for their removal.