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Trends in Micropoll...
Trends in Micropollutant Biotransformation along a Solids Retention Time Gradient
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- Achermann, Stefan (author)
- ETH Zürich,Eawag: Swiss Federal Institute of Aquatic Science and Technology
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- Falås, Per (author)
- Lund University,Lunds universitet,Avdelningen för kemiteknik,Institutionen för processteknik och tillämpad biovetenskap,Institutioner vid LTH,Lunds Tekniska Högskola,Division of Chemical Engineering,Department of Process and Life Science Engineering,Departments at LTH,Faculty of Engineering, LTH,Eawag: Swiss Federal Institute of Aquatic Science and Technology
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- Joss, Adriano (author)
- Eawag: Swiss Federal Institute of Aquatic Science and Technology
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- Mansfeldt, Cresten B. (author)
- Eawag: Swiss Federal Institute of Aquatic Science and Technology
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- Men, Yujie (author)
- University of Illinois at Urbana-Champaign,Eawag: Swiss Federal Institute of Aquatic Science and Technology
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- Vogler, Bernadette (author)
- Eawag: Swiss Federal Institute of Aquatic Science and Technology
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- Fenner, Kathrin (author)
- ETH Zürich,University of Zurich,Eawag: Swiss Federal Institute of Aquatic Science and Technology
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(creator_code:org_t)
- 2018-10
- 2018
- English.
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In: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 52:20, s. 11601-11611
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http://dx.doi.org/10...
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Abstract
Subject headings
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- For many polar organic micropollutants, biotransformation by activated sludge microorganisms is a major removal process during wastewater treatment. However, our current understanding of how wastewater treatment operations influence microbial communities and their micropollutant biotransformation potential is limited, leaving major parts of observed variability in biotransformation rates across treatment facilities unexplained. Here, we present biotransformation rate constants for 42 micropollutants belonging to different chemical classes along a gradient of solids retention time (SRT). The geometric mean of biomass-normalized first-order rate constants shows a clear increase between 3 and 15 d SRT by 160% and 87%, respectively, in two experiments. However, individual micropollutants show a variety of trends. Rate constants of oxidative biotransformation reactions mostly increased with SRT. Yet, nitrifying activity could be excluded as primary driver. For substances undergoing other than oxidative reactions, i.e., mostly substitution-type reactions, more diverse dependencies on SRT were observed. Most remarkably, characteristic trends were observed for groups of substances undergoing similar types of initial transformation reaction, suggesting that shared enzymes or enzyme systems that are conjointly regulated catalyze biotransformation reactions within such groups. These findings open up opportunities for correlating rate constants with measures of enzyme abundance such as genes or gene products, which in turn should help to identify enzymes associated with the respective biotransformation reactions.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Miljöbioteknik -- Vattenbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Biotechnology -- Water Treatment (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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