Relative contribution of ammonia oxidizing bacteria and other members of nitrifying activated sludge communities to micropollutant biotransformation

Men, Yujie; Achermann, Stefan; Helbling, Damian E.; Johnson, David R.; Fenner, Kathrin

doi:10.1016/j.watres.2016.11.048

Cited by 133 publications

(91 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…59 However, more recently, it has been found that acesulfame was degraded by activated sludge communities from different WWTPs. 50,60,61 Castronovo et al observed quantitative biotransformation of acesulfame to sulfamic acid and a metabolic degradation was hypothesized but the reaction pathway is not entirely understood yet. 60 We are not aware of any previous studies having demonstrated the observed dependence of acesulfame biotransformation on SRT.…”

Section: Dependence Of Biotransformation Rate Constants On Srtmentioning

confidence: 99%

Trends in Micropollutant Biotransformation along a Solids Retention Time Gradient

Achermann

Falås

Joss

et al. 2018

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Dependence Of Biotransformation Rate Constants On Srtmentioning

confidence: 99%

Trends in Micropollutant Biotransformation along a Solids Retention Time Gradient

Achermann

Falås

Joss

et al. 2018

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hence, action of the AMO enzyme on any observed biotransformation of these compounds is highly unlikely. Other ammonia oxidizing enzymes (Helbling et al, 2010;Men et al, 2017) or heterotrophic bacteria (Fernandez Fontaina et al, 2016;Khunjar et al, 2011a) may be responsible for the biotransformation of TOrCs in aerobic activated sludge. For example, atenolol with a primary amide is known to undergo enzymatic hydrolysis to atenololic acid under aerobic conditions by amide hydrolyzing enzymes (e.g., amidase) that are abundant in activated sludge microbial communities (Radjenovic et al, 2008;Helbling et al, 2010).…”

Section: Impact Of Redox Condition On Biotransformationmentioning

confidence: 99%

Biotransformation and sorption of trace organic compounds in biological nutrient removal treatment systems

Lakshminarasimman

Quiñones

Vanderford

et al. 2018

Science of The Total Environment

View full text Add to dashboard Cite

This study determined biotransformation rates (k) and sorption-distribution coefficients (K) for a select group of trace organic compounds (TOrCs) in anaerobic, anoxic, and aerobic activated sludge collected from two different biological nutrient removal (BNR) treatment systems located in Nevada (NV) and Ohio (OH) in the United States (US). The NV and OH facilities operated at solids retention times (SRTs) of 8 and 23 days, respectively. Using microwave-assisted extraction, the biotransformation rates of the chosen TOrCs were measured in the total mixed liquor. Sulfamethoxazole, trimethoprim, and atenolol biotransformed in all three redox regimes irrespective of the activated sludge source. The biotransformation of N, N-diethyl-3-methylbenzamide (DEET), triclosan, and benzotriazole was observed in aerobic activated sludge from both treatment plants; however, anoxic biotransformation of these three compounds was seen only in anoxic activated sludge from NV. Carbamazepine was recalcitrant in all three redox regimes and both sources of activated sludge. Atenolol and DEET had greater biotransformation rates in activated sludge with a higher SRT (23 days), while trimethoprim had a higher biotransformation rate in activated sludge with a lower SRT (8 days). The remaining compounds did not show any dependence on SRT. Lyophilized, heat inactivated sludge solids were used to determine the sorption-distribution coefficients. Triclosan was the most sorptive compound followed by carbamazepine, sulfamethoxazole, DEET, and benzotriazole. The sorption-distribution coefficients were similar across redox conditions and sludge sources. The biotransformation rates and sorption-distribution coefficients determined in this study can be used to improve fate prediction of the target TOrCs in BNR treatment systems.

show abstract

“…For clomazone a typical laboratory half-life at 20 • C is 22.6 days (6.3-145.7 days) and its field half-life is 27.3 days (9.3-195 days) [24]. This wide spread in half-life values suggests that clomazone dissipation may be influenced by many factors, including UV irradiation [29], and the presence of oxygen [30] or ammonia-oxidizing bacteria [31]. In our study, the addition of the biological preparation shortened the dissipation half-lives by 6.3 days (7.1%) (experiment 1) and 18.4 days (25.1%) (experiment 2).…”

Section: Clomazonementioning

confidence: 99%

Influence of a Commercial Biological Fungicide containing Trichoderma harzianum Rifai T-22 on Dissipation Kinetics and Degradation of Five Herbicides in Two Types of Soil

et al. 2020

View full text Add to dashboard Cite

Biological crop protection is recommended to be applied alternately or together with chemical one, to protect human health from the excessive use of toxic pesticides. Presence of microorganisms can influence the concentration of chemical pollutants in soil. The aim of this study is to estimate the influence of a commercial biological fungicide containing Trichoderma harzianum Rifai T-22 on dissipation kinetics and degradation of five herbicides belonging to different chemical classes: clomazone, fluazifop-P-butyl, metribuzin, pendimethalin, and propyzamide, in two types of soil. Results of the study revealed that T. harzianum T-22 influences pesticide degradation and dissipation kinetics of the non-persistent herbicides: clomazone, fluazifop-P-butyl, and metribuzin. In soil with a higher content of nitrogen, phosphorus, and organic matter, degradation increased by up to 24.2%, 24.8%, and 23.5% for clomazone, fluazifop-P-butyl, and metribuzin, respectively. In soil with lower organic content, degradation was on a low level, of 16.1%, 17.7%, and 16.3% for clomazone, fluazifop-P-butyl, and metribuzin, respectively. In our study, the addition of the biological preparation shortened herbicide dissipation half-lives, from 0.3 days (2.9%) for fluazifop-P-butyl, to 18.4 days (25.1%) for clomazone. During the degradation study, no significant differences were noticed for pendimethalin, belonging to persistent substances. Biological protection of crops can modify pesticide concentrations and dissipation rates. On one hand, this may result in the reduced effectiveness of herbicide treatments, while on the other, it can become a tool for achieving cleaner environment.

show abstract

Relative contribution of ammonia oxidizing bacteria and other members of nitrifying activated sludge communities to micropollutant biotransformation

Cited by 133 publications

References 54 publications

Trends in Micropollutant Biotransformation along a Solids Retention Time Gradient

Trends in Micropollutant Biotransformation along a Solids Retention Time Gradient

Biotransformation and sorption of trace organic compounds in biological nutrient removal treatment systems

Influence of a Commercial Biological Fungicide containing Trichoderma harzianum Rifai T-22 on Dissipation Kinetics and Degradation of Five Herbicides in Two Types of Soil

Contact Info

Product

Resources

About