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BL
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| Record Number
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841800
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| Main Entry
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Tan, Lea Chua
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| Title & Author
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Anaerobic Treatment of Mine Wastewater for the Removal of Selenate and its Co-Contaminants /\ Lea Chua Tan.
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| Publication Statement
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Leiden :: CRC Press,, 2018.
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| Series Statement
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IHE Delft PhD thesis series
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| Page. NO
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1 online resource
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| ISBN
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0429448678
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: 042982839X
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: 0429828403
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: 0429828411
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: 9780429448676
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: 9780429828393
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: 9780429828409
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: 9780429828416
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1138328413
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9781138328419
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| Contents
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Cover; Half Title; Title Page; Copyright Page; Table of Contents; Acknowledgements; Summary; Sommario; Samenvatting; Résumé; CHAPTER 1: General Introduction; 1.1 Background; 1.2 Problem description; 1.3 Research objectives; 1.4 Structure of the thesis; 1.5 References; CHAPTER 2: Selenium: Environmental significance, pollution, and biological treatment technologies; Abstract; 2.1 Introduction; 2.2 Why is selenium important?; 2.2.1 The biogeochemical selenium cycle; 2.2.2 Global market and uses of selenium; 2.2.3 Human health and bioaccumulation of selenium
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2.2.4 Need for selenium management and pollution control2.3 Selenium-laden wastewaters; 2.3.1 Wastewater sources; 2.3.2 Overview of selenium removal technologies; Physical methods; High-rate methods; Evaporation ponds; Chemical methods; Biological treatment; 2.4 Biotreatment technologies; 2.4.1 Microbial reduction mechanism; 2.4.2 Inocula for bioreactors; 2.4.3 Bioreactors; Biofilm reactors; ABMET® biological technology; Envirogen fluidized bed reactor (FBR) system; Membrane biofilm reactor (MBfR); Sludge-based bioreactors; Upflow anaerobic sludge bed (UASB) reactor
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CHAPTER 3: Effect of elevated nitrate and sulfate concentrations on selenate removal by mesophilic anaerobic granular bed reactorsAbstract; 3.1 Introduction; 3.2 Materials and methods; 3.2.1 Source of biomass; 3.2.2 Synthetic wastewater; 3.2.3 Batch experiments for determining reduction profiles; 3.2.4 UASB reactor operation; 3.2.5 Analytical methods; 3.2.6 FISH imaging; 3.3 Results; 3.3.1. Reduction profiles of NO3-, SO42- and SeO42- by anaerobic granular sludge; Removal of individual oxyanions; SeO42- removal in the presence of NO3-; SeO42- removal in the presence of SO42-
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SeO42- removal in the presence of both SO42- and NO3-3.3.2 Treatment of synthetic mine-impacted wastewater in a UASB reactor; UASB reactor treating wastewater with co-electron acceptors; UASB reactor treating NO3- and SeO42- contaminated wastewater; UASB reactor treating only SeO42- contaminated wastewater; 3.3.3 Microbial community analysis through FISH imaging; 3.4 Discussion; 3.4.1 SeO42- removal with co-electron acceptors in batch and continuous systems; Influence of NO3- on SeO42- removal; Influence of SO42- on SeO42- removal; 3.4.2 Effect of NO3- and SO42- on Se species mass balance
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Sequencing batch reactor (SBR)Fungal-pellet bioreactor; 2.4.4 Other biotreatment configurations; Volatilization of selenium; Algal-pond systems; 2.5 Challenges in selenium biotechnologies; 2.5.1 Toxicity of selenium oxyanions to biomass; 2.5.2 Removal and recovery of biogenic selenium (Se0) nanoparticles; 2.5.3 Wastewater composition: presence of NO3- and SO42-; 2.5.4 Operating parameters; 2.6 Future perspective in selenium biotechnologies; 2.7 Conclusions; 2.8 References
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| Abstract
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Selenium (Se) pollution has led to several cases of severe aquatic ecosystem deterioration due to Se poisoning caused by bioaccumulation over time. However, the removal of selenate (SeO42- ) from wastewater streams with co-contaminants has been largely considered as a black box in anaerobic biological systems using mixed consortia. This research aimed at addressing the effect of wastewater characteristics, i.e. co-contaminants such as nitrate (NO3- ) and sulfate (SO42- ), heavy metals and pH, on the biological reduction of SeO42- and evaluating process integration for Se-laden wastewater treatment with co-contaminants. This study demonstrated that the presence of co-contaminants can actually be beneficial for Se removal provided that the concentrations are carefully monitored and appropriate operating conditions and process configurations are used. The Se removal (total Se and SeO42- ) efficiency increased by ~30% in the presence of NO3- and/or SO42- compared to systems with SeO42- alone. Additionally, an integrated process of an ion exchange (IX) column and bioreactors showed improved overall removal capacity for SO42- and total Se. The knowledge and information gained from this research can help in the advancement and application of biological processes, i.e. predicting of reactor performance, solving specific design or practical problems and implementing novel treatment techniques for Se-laden mine wastewater.
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| Subject
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Mineral industries-- Waste disposal.
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| Subject
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Mineral industries-- Waste disposal.
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| Subject
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TECHNOLOGY ENGINEERING-- Environmental-- General.
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| Dewey Classification
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628.1683
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| LC Classification
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TD899.M5
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