Effects of 4-chlorophenol toxicity on sludge performance and microbial community in sequencing batch reactors

Zhao, Jian; Li, Yahe; Li, Yu; Heng, Yang; Hu, Dehuan; Zhang, Hongzhong

doi:10.1080/10934529.2019.1567159

Cited by 8 publications

(2 citation statements)

References 32 publications

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“…In order to achieve high nutrient removal efficiencies and low SVI values, the study concluded that the process should be run at low 4-CP contents of 100 mg L -1 and high sludge ages of 20 days. Zhao et al [148] increased the 4-CP influent concentrations from 10 to 100 mg L -1 and stated that the enzymatic activity was incited after long-term acclimation with 4-CP.…”

Section: Chlorophenolsmentioning

confidence: 99%

Toxic Effects of Xenobiotic Compounds on the Microbial Community of Activated Sludge

et al. 2022

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The presence of xenobiotic compounds in biological wastewater treatment processes with activated sludge may reduce microbial communities, disrupt microbial diversity, and diminish system performance. Shock loads and unusual operating events in these biological systems have negative impacts on their efficiency and reliability for pollutant degradation, thereby posing high risk to microorganisms and water quality of receiving treated water bodies. The severity and characteristics of the occurring damage are determined by the toxic contaminant's degree, nature and mode of application. This review highlights the effects of metabolic uncouplers, heavy metals, carbon nanotubes, pharmaceuticals and personal care products, nanoparticles, and phenolic compounds stress on microbial biomass in activated sludge systems. The synergistic, antagonistic, and shock load toxic effects of hybrid substances exposure in an activated sludge sequential batch reactor (SBR) system on organic and nutrient removal, system efficiency, and toxicants biodegradation are discussed. The findings can be used to provide a theoretical foundation and professional assistance for optimizing the shock impacts of these toxic substances on biological wastewater treatment systems, which will help to reduce their negative effects on treatment system efficiency.

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Section: Chlorophenolsmentioning

confidence: 99%

Toxic Effects of Xenobiotic Compounds on the Microbial Community of Activated Sludge

et al. 2022

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“…Thus, the plasmid bearers gain a unique niche with competitive advantages over the bacteria without plasmids. On the other hand, the recalcitrant contaminants exert toxic effects on the bacterial cells and trigger a cascade of responses in the cells to ameliorate the situation (Zhao et al 2019). In this sense, the contaminants serve as a selection pressure to promote the catabolic plasmid-bearing population in the bacterial community, like a driver of genetic bioaugmentation.…”

Section: Introductionmentioning

confidence: 99%

The impact of pollutant as selection pressure on conjugative transfer of dioxin-catabolic plasmids harbored by Rhodococcus sp. strain p52

Zhao

Wang

et al. 2021

Environ Sci Pollut Res

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Plasmid-mediated bioaugmentation has potential application in the cleanup of recalcitrant environmental pollutants. In this study, we examined the in uence of various contaminants (in different categories or different amounts) as a selection pressure on the transfer of catabolic plasmids within an activated sludge bacteria community bioaugmented with Rhodococcus sp. strain p52 harboring pDF01 and pDF02. The distinguishable genera of transconjugants were isolated under the stresses of phenanthrene, dibenzothiophene, and dibenzo-p-dioxin. The difference in genomic G + C content (5.0 ~ 27.5%) between transconjugants and strain p52 indicated the transfer of the catabolic plasmids crossing phylogenetic boundaries. The speci c removal rates in activated sludge reactors for phenanthrene, dibenzothiophene, and dibenzo-p-dioxin were elevated in turn. The three contaminants exerted different degrees of in uence on the activated sludge bacteria bearing the catabolic plasmids. The highest proportion of transconjugants was detected in the reactor fed with dibenzo-p-dioxin. Additionally, as dibenzo-p-dioxin from 10 to 80 mg/L was fed into the reactors, the proportion of transconjugants increased. Film mating tests demonstrated that the plasmid transfer frequency varied among recipients under the contaminant stresses of phenanthrene, dibenzothiophene, and dibenzo-p-dioxin. Our study provides a characterization of the recalcitrant contaminants as a selection pressure that can modulate catabolic plasmid transfer during genetic bioaugmentation for the removal of contaminants.

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Triboelectric pulsed direct-current enhanced radical generation for efficient degradation of organic pollutants in wastewater

Liu

et al. 2022

Applied Catalysis B: Environmental

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Effects of 4-chlorophenol toxicity on sludge performance and microbial community in sequencing batch reactors

Cited by 8 publications

References 32 publications

Toxic Effects of Xenobiotic Compounds on the Microbial Community of Activated Sludge

Toxic Effects of Xenobiotic Compounds on the Microbial Community of Activated Sludge

The impact of pollutant as selection pressure on conjugative transfer of dioxin-catabolic plasmids harbored by Rhodococcus sp. strain p52

Triboelectric pulsed direct-current enhanced radical generation for efficient degradation of organic pollutants in wastewater

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