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

Lakshminarasimman Meanakshisek, Narasimman
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479818400753707

Abstract Details

2016, MS, University of Cincinnati, Engineering and Applied Science: Environmental Engineering.
In this study, the biotransformation of seven trace organic compounds (TOrCs) in biological nutrient removal (BNR) treatment systems was investigated. Biotransformation experiments were conducted using activated sludge from anaerobic, anoxic and aerobic redox regimes and two 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-order biotransformation rates (kbio) were determined. Sulfamethoxazole, trimethoprim, and atenolol biotransformed in all three redox regimes irrespective of the activated sludge source. The biotransformation fate of N,N-diethyl-3-methylbenzamide (DEET), triclosan, and benzotriazole was impacted by the redox condition and the source of activated sludge. Carbamazepine was recalcitrant in all three redox regimes and both sources of activated sludge. Compounds like atenolol and DEET had greater biotransformation rates in activated sludge with a higher SRT (23 days). Trimethoprim had a converse trend with higher biotransformation rate in activated sludge with a lower SRT. The remaining compounds did not show any dependence on SRT. The formation of biotransformation intermediates were studied for three compounds namely benzotriazole, triclosan, and trimethoprim in aerobic and anoxic activated sludge. Four intermediates were observed for benzotriazole in both aerobic and anoxic activated sludge. These intermediates consisted of two isomers of hydroxy benzotriazole and two isomers of methoxy benzotriazole. Triclosan had two transformation products namely 2, 4-dicholorphenol and triclosan-o-sulfate. Formation of 2, 4-dicholoro phenol through meta cleavage of the parent compound was seen only under aerobic conditions, whereas the sulfation of triclosan to form triclosan-o-sulfate was seen under both aerobic and anoxic conditions. The formation of intermediates for trimethoprim was seen only in aerobic conditions. Mechanism of hydroxylation, which formed intermediates TMP 306 and TMP 324, and demethylation, which formed two isomers of desmethyl trimethoprim, were observed for trimethoprim under aerobic conditions.
Drew McAvoy, Ph.D. (Committee Chair)
Pablo Campo, Ph.D. (Committee Member)
Margaret Kupferle, Ph.D. (Committee Member)
George Sorial, Ph.D. (Committee Member)
101 p.
Environmental Engineering
Trace Organic Compounds; BNR treatment; micropollutants; biotransformation fate; biotransformation intermediates; activated sludge

Recommended Citations

Citations

  • Lakshminarasimman Meanakshisek, N. (2016). Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479818400753707

    APA Style (7th edition)

  • Lakshminarasimman Meanakshisek, Narasimman. Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems. 2016. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479818400753707.

    MLA Style (8th edition)

  • Lakshminarasimman Meanakshisek, Narasimman. "Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems." Master's thesis, University of Cincinnati, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1479818400753707

    Chicago Manual of Style (17th edition)

ucin1479818400753707
287
© 2016, some rights reserved.Creative Commons License Evaluating the Fate Mechanisms of Trace Organic Compounds in Biological Nutrient Removal Treatment Systems by Narasimman Lakshminarasimman Meanakshisek is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.