Impact of phenol shock loads on the performance of a combined activated sludge-moving bed biofilm reactor system

Alves, Alessandro; Lima, Priscila Machado Vieira; Dezotti, Márcia; Bassin, João Paulo

doi:10.1016/j.ibiod.2017.06.015

Cited by 33 publications

(11 citation statements)

References 38 publications

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“…8 Nevertheless, previous studies also suggest that even though acclimated sludge could withstand phenol of high concentrations, the predominant population and bioactivity of sludge are signicantly inuenced by phenol. 10,11 Microbial characteristics can effectively elucidate the degradation mechanism and reect the performance of biological processes since biodegradation relies heavily on the functions and activity of microorganisms. Many studies have investigated the inuence of phenol on certain characteristics of activated sludge, which mainly focus on microbial communities, metabolism and surface properties.…”

Section: Introductionmentioning

confidence: 99%

Changes in degrading ability, populations and metabolism of microbes in activated sludge in the treatment of phenol wastewater

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Changes in degrading ability, populations and metabolism of microbes in activated sludge in the treatment of phenol wastewater

et al. 2017

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“…AOB are more resilient to toxic compounds than NOB because they can undergo oxidative stress and up-regulate maintenance enzymes (Geets et al ., 2006; Ge et al ., 2015; Laloo et al ., 2018). Indeed, the inability of NOB to recover from sustained toxin input has been documented (mostly in unreplicated studies), with respect to 4-CA (Zhu et al ., 2014), phenol (Alves et al ., 2017) and triclocarban (Bian et al ., 2020).…”

Section: Resultsmentioning

confidence: 99%

“…After a pulse chemical disturbance in the form of 3-chloroaniline (3-CA), Ma et al (2020) found that both AOB and NOB relative abundance decreased, but recovered within two weeks to pre-disturbance levels. Alves et al (2017), however, only saw AOB recovery after a pulse phenol disturbance. Few studies have examined the impact of a sustained xenobiotic stress on nitrifiers in a controlled, replicated study.…”

Section: Introductionmentioning

confidence: 89%

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Metagenomics and Metatranscriptomics Suggest Pathways of 3-Chloroaniline Degradation in Wastewater Reactors

Seshan

Santillan

Constancias

et al. 2021

Preprint

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Biological wastewater treatment systems are often affected by major shifts in influent quality, including the input of various toxic chemicals. Yet the mechanisms underlying adaptation of activated sludge process performance when challenged with a sustained toxin input have not been studied in a controlled and replicated experiment. Three replicate bench-scale bioreactors were subjected to a chemical disturbance in the form of 3-chloroaniline (3-CA) input over 132 days, following an acclimation period of 58 days, while three control reactors received no 3-CA input. The nitrification process was initially affected by 3-CA input; yet all three treatment reactors evolved to biologically degrade 3-CA within three weeks of the experiment, resulting in partial nitrification recovery. 16S rRNA amplicon sequencing revealed that ammonia oxidizers were initially impacted by 3-CA, and a new ammonia oxidizing community emerged with the onset of 3-CA degradation. Combining process and microbial community data from amplicon sequencing with potential functions gleaned from assembled metagenomics and metatranscriptomics data, 3-CA degradation was shown to likely occur via a phenol monooxygenase followed by ortho-cleavage of the aromatic ring. The relative abundance of genera Gemmatimonas, Saprospiraceae OLB8 and Taibaiella correlated significantly with 3-CA degradation. This study demonstrated the impact of a sustained stress on the activated sludge community and wastewater treatment process and its subsequent recovery. Using a combination of techniques in a controlled and replicated experiment, we showed that microbial communities can evolve degradative capacity following a sustained xenobiotic input, specific functions like nitrification can fully or partially recover and targeted culture-independent approaches can be used to elucidate the mechanisms of adaptation.

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“…Phenol is an aromatic compound widely used in industrial processes (Bu et al 2020). Although phenol is biodegradable (Essam et al 2010;Parvanov and Topalova 2008;Yusoff et al 2019), a large number of studies have shown that phenol has toxic and inhibitory effects on microorganisms (Alves et al 2017;Inglezakis et al 2017;Kim et al 2006;Neumegen et al 2005). High concentrations of phenol inhibit the growth of microorganisms (Demoling and Baath 2008) and constrain microbial activity (Alves et al 2017;Inglezakis et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Shifts in structure and function of bacterial community in river and fish pond sediments after a phenol spill

Chen

Feng

Zheng

et al. 2021

Environ Sci Pollut Res

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Phenol is widely used in industrial processes and has microbial toxicity. However, the effects of a phenol spill on the microbial community are not clear. The present study explored the changes of bacterial communities in river and fish pond sediments after a phenol spill. The bacterial richness and diversity in river sediments were lower on day 30 (36 days after the spill) than on day 0, while they increased in fish pond sediments. The structures and functions of bacterial communities in both river and fish pond sediments were changed, and a more dramatical variation was detected in fish pond sediments. In river sediments, Proteobacteria, Chloroflexi, Acidobacteria, Bacteroidetes, and Nitrospirae were the major bacterial phyla, and Chloroflexi was enriched. In fish pond sediments, genera Brevibacillus dominated bacterial communities initially, and bacterial composition showed a dramatic change on day 30. Most predicted metabolism functions, as well as genetic information processing functions of translation, replication, and repair, were enhanced in both river and fish pond sediments, while they showed an opposite change trend for xenobiotic degradation function. This work could strengthen our understanding of the effects of phenol spills on sediment bacterial communities in both lotic and lentic ecosystems.

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Impact of phenol shock loads on the performance of a combined activated sludge-moving bed biofilm reactor system

Cited by 33 publications

References 38 publications

Changes in degrading ability, populations and metabolism of microbes in activated sludge in the treatment of phenol wastewater

Changes in degrading ability, populations and metabolism of microbes in activated sludge in the treatment of phenol wastewater

Metagenomics and Metatranscriptomics Suggest Pathways of 3-Chloroaniline Degradation in Wastewater Reactors

Shifts in structure and function of bacterial community in river and fish pond sediments after a phenol spill

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