Degradation of triclosan and triclocarban and formation of transformation products in activated sludge using benchtop bioreactors

Armstrong, Dana L.; Lozano, Núria; Rice, Clifford P.; Ramirez, Mark; Torrents, Alba

doi:10.1016/j.envres.2017.10.048

Cited by 47 publications

(20 citation statements)

References 43 publications

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“…7B (i.e., at the condition metabolizing TCS as the sole carbon source). The TCS utilization rate (33.9 × 10 −2 /h) observed in our study was higher than other previous estimates ( < 10 × 10 −2 /h) of TCS degradation by activated sludge at similar levels (1–5 mg/L of TCS) 32,35,36 . Accordingly, the higher TCS utilization rate observed in our study was likely due to the microbial community adaptation (associated with the increase of TCS removal) that occurred within the first month of reactor operation (Fig.…”

Section: Resultscontrasting

confidence: 85%

Ecological processes underpinning microbial community structure during exposure to subinhibitory level of triclosan

Choi

Cha

2019

Sci Rep

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Ecological processes shaping the structure and diversity of microbial communities are of practical importance for managing the function and resilience of engineered biological ecosystems such as activated sludge processes. This study systematically evaluated the ecological processes acting during continuous exposure to a subinhibitory level of antimicrobial triclosan (TCS) as an environmental stressor. 16S rRNA gene-based community profiling revealed significant perturbations on the community structure and dramatic reduction (by 20–30%) in species diversity/richness compared to those under the control conditions. In addition, community profiling determined the prevalence of the deterministic processes overwhelming the ecological stochasticity. Analysis of both community composition and phenotypes in the TCS-exposed communities suggested the detailed deterministic mechanism: selection of TCS degrading (Sphingopyxis) and resistant (Pseudoxanthomonas) bacterial populations. The analysis also revealed a significant reduction of core activated sludge members, Chitinophagaceae (e.g., Ferruginibacter) and Comamonadaceae (e.g., Acidovorax), potentially affecting ecosystem functions (e.g., floc formation and nutrient removal) directly associated with system performance (i.e., wastewater treatment efficiency and effluent quality). Overall, our study provides new findings that inform the mechanisms underlying the community structure and diversity of activated sludge, which not only advances the current understanding of microbial ecology in activated sludge, but also has practical implications for the design and operation of environmental bioprocesses for treatment of antimicrobial-bearing waste streams.

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Section: Resultscontrasting

confidence: 85%

Ecological processes underpinning microbial community structure during exposure to subinhibitory level of triclosan

Choi

Cha

2019

Sci Rep

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“…TCC dechlorination reactions lead to carbanilides ( Figure 3 ) including 4,4′-dichlorocarbanilide (DCC), 1-(3-chlorophenyl)-3-phenylurea (MCC), and carbanilide (NCC), or either biologically or abiotically to 4-chloroaniline (4-CA) [ 57 ]. Miller et al (2010) suggested, for the first time, the occurrence of reductive dechlorination of TCC in estuarine sediments [ 58 ].…”

Section: Metabolism and Transformation Products Of Tccmentioning

confidence: 99%

“…Additionally, TCC degrades via aerobic biodegradation and photolysis into toxic chlorinated anilines [ 59 ]. The fate of TCC and its transformation products in wastewater has been extensively studied by Armstrong et al [ 38 , 57 , 92 ]. TCC may interact with nitrifying cultures, which are important microbial communities in wastewater treatment plants; however, this interaction has not been totally clarified.…”

Section: Ecotoxicity Of Triclocarbanmentioning

confidence: 99%

The Different Facets of Triclocarban: A Review

et al. 2021

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In the late 1930s and early 1940s, it was discovered that the substitution on aromatic rings of hydrogen atoms with chlorine yielded a novel chemistry of antimicrobials. However, within a few years, many of these compounds and formulations showed adverse effects, including human toxicity, ecotoxicity, and unwanted environmental persistence and bioaccumulation, quickly leading to regulatory bans and phase-outs. Among these, the triclocarban, a polychlorinated aromatic antimicrobial agent, was employed as a major ingredient of toys, clothing, food packaging materials, food industry floors, medical supplies, and especially of personal care products, such as soaps, toothpaste, and shampoo. Triclocarban has been widely used for over 50 years, but only recently some concerns were raised about its endocrine disruptive properties. In September 2016, the U.S. Food and Drug Administration banned its use in over-the-counter hand and body washes because of its toxicity. The withdrawal of triclocarban has prompted the efforts to search for new antimicrobial compounds and several analogues of triclocarban have also been studied. In this review, an examination of different facets of triclocarban and its analogues will be analyzed.

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“…This study showed that the TCS and HHCB dissipation in the microcosms followed the firstorder exponential decay model. The same model has been described for TCS (Chen et al, 2011;Armstrong et al, 2018) and HHCB (Martin et al, 2007) dissipation by wastewater microorganisms and fungi, respectively. TCS dissipated slowly in systems without worm presence with a t1/2 value of 301 d which is larger than the t1/2 value of 58 d detected in the pond water-silty clay loam sediment system under aerobic conditions (EU, 2012) and 239 d in the lake water-silty clay sediment system with dissolved oxygen levels above 3 mg/L (Huang et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…With their hydrophobic nature, these two chemicals likely sorb to settling particles and may thus be subject to bio-accumulation in deposit-feeding macroinvertebrates (Balk and Ford, 1999a;Bedoux et al, 2012). To date, laboratory degradation studies of TCS and HHCB have been limited to soil bacterial cultures , wastewater microorganisms (Lee et al, 2012), fungi (Martin et al, 2007;Vallecillos et al, 2017), diatom (Ding et al, 2018), algae (Wang et al, 2018), activated sludge (Chen et al, 2011(Chen et al, , 2015Armstrong et al, 2017Armstrong et al, , 2018 and iron and manganese oxides (Ding et al, 2015). For example, TCS can be transformed into methyl triclosan (Me-TCS) in activated sludge under aerobic conditions (Chen et al, 2011) and in biosolid-amended agricultural soil by earthworms (Macherius et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Ecological risks of personal care ingredients for subtropical benthic communities

Peng¹

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Pseudokirchneriella subcapitata Algae 72 h, Growth inhibition, NOEC 0.53 (Tamura et al. 2013) Daphnia magna Crustacean 21 d, Reproduction, NOEC 40 (Orvos et al. 2002) Daphnia magna Crustacean 21 d, Survival, NOEC 200 (Orvos et al. 2002) Ceriodaphnia dubia Crustacean 7 d, Survival, NOEC 50 (Orvos et al. 2002) Ceriodaphnia dubia Crustacean 7 d, Survival, NOEC 339 (Orvos et al. 2002) Ceriodaphnia dubia Crustacean 8 d, Reproduction, NOEC 30 (Tamura et al. 2013) Ceriodaphnia dubia Crustacean 7 d, Reproduction, NOEC 6 (Orvos et al. 2002) Ceriodaphnia dubia Crustacean 7 d, Reproduction, NOEC 182 (Orvos et al. 2002

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Degradation of triclosan and triclocarban and formation of transformation products in activated sludge using benchtop bioreactors

Cited by 47 publications

References 43 publications

Ecological processes underpinning microbial community structure during exposure to subinhibitory level of triclosan

Ecological processes underpinning microbial community structure during exposure to subinhibitory level of triclosan

The Different Facets of Triclocarban: A Review

Ecological risks of personal care ingredients for subtropical benthic communities

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