Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems

Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems

Bibliographic Details
Main Author: Lakshminarasimman Meanakshisek, Narasimman
Language:English
Published: University of Cincinnati / OhioLINK 2016
Subjects:
Environmental Engineering
Trace Organic Compounds
BNR treatment
micropollutants
biotransformation fate
biotransformation intermediates
activated sludge
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479818400753707
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin14798184007537072021-08-03T06:39:09Z Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems Lakshminarasimman Meanakshisek, Narasimman Environmental Engineering Trace Organic Compounds BNR treatment micropollutants biotransformation fate biotransformation intermediates activated sludge In this study, the biotransformation of seven trace organic compounds (TOrCs) in biologicalnutrient removal (BNR) treatment systems was investigated. Biotransformation experimentswere conducted using activated sludge from anaerobic, anoxic and aerobic redox regimes andtwo different BNR treatment plants operating at solid retention times (SRT) 8 days and 23 days.Total concentration of the TOrCs were analyzed in the mixed liquor samples and first-orderbiotransformation rates (kbio) were determined. Sulfamethoxazole, trimethoprim, and atenololbiotransformed in all three redox regimes irrespective of the activated sludge source. Thebiotransformation fate of N,N-diethyl-3-methylbenzamide (DEET), triclosan, and benzotriazolewas impacted by the redox condition and the source of activated sludge. Carbamazepine wasrecalcitrant in all three redox regimes and both sources of activated sludge. Compounds likeatenolol and DEET had greater biotransformation rates in activated sludge with a higher SRT (23days). Trimethoprim had a converse trend with higher biotransformation rate in activated sludgewith a lower SRT. The remaining compounds did not show any dependence on SRT. Theformation of biotransformation intermediates were studied for three compounds namelybenzotriazole, triclosan, and trimethoprim in aerobic and anoxic activated sludge. Fourintermediates were observed for benzotriazole in both aerobic and anoxic activated sludge. Theseintermediates consisted of two isomers of hydroxy benzotriazole and two isomers of methoxybenzotriazole. Triclosan had two transformation products namely 2, 4-dicholorphenol andtriclosan-o-sulfate. Formation of 2, 4-dicholoro phenol through meta cleavage of the parentcompound was seen only under aerobic conditions, whereas the sulfation of triclosan to formtriclosan-o-sulfate was seen under both aerobic and anoxic conditions. The formation ofintermediates for trimethoprim was seen only in aerobic conditions. Mechanism ofhydroxylation, which formed intermediates TMP 306 and TMP 324, and demethylation, whichformed two isomers of desmethyl trimethoprim, were observed for trimethoprim under aerobicconditions. 2016 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479818400753707 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479818400753707 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection NDLTD
language English
sources NDLTD
topic Environmental Engineering
Trace Organic Compounds
BNR treatment
micropollutants
biotransformation fate
biotransformation intermediates
activated sludge
spellingShingle Environmental Engineering
Trace Organic Compounds
BNR treatment
micropollutants
biotransformation fate
biotransformation intermediates
activated sludge
Lakshminarasimman Meanakshisek, Narasimman
Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems
author Lakshminarasimman Meanakshisek, Narasimman
author_facet Lakshminarasimman Meanakshisek, Narasimman
author_sort Lakshminarasimman Meanakshisek, Narasimman
title Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems
title_short Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems
title_full Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems
title_fullStr Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems
title_full_unstemmed Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems
title_sort evaluating the fate mechanisms of trace organic compounds in biological nutrient removal treatment systems
publisher University of Cincinnati / OhioLINK
publishDate 2016
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479818400753707
work_keys_str_mv AT lakshminarasimmanmeanakshiseknarasimman evaluatingthefatemechanismsoftraceorganiccompoundsinbiologicalnutrientremovaltreatmentsystems
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