Sludge digestibility and functionally active microorganisms in methanogenic sludge digesters revealed by E. coli-fed digestion and microbial source tracking

Liang, Zhiwei; Xu, Guofang; Shi, Jiangjian; Yu, Sining; Lu, Qihong; Liang, Dawei; Sun, Lianpeng; Wang, Shanquan

doi:10.1016/j.envres.2020.110539

Cited by 20 publications

(8 citation statements)

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“…Modeling studies have shown that the pseudo second-order model is the best fit for the kinetics of BDE-209 adsorption, although the best description of BDE-209 adsorption equilibrium is temperature dependent. , Studies have also found that the adsorption equilibrium of BDE-209 onto wastewater sludge follows the Langmuir model at low temperatures (10–20 °C), but the Freundlich model better describes the BDE-209 adsorption equilibrium at higher temperatures (30 °C) . Interestingly, adsorption of a lesser brominated PBDE, BDE-47, by living Pseudomonas stutzier cells is better characterized by the Langmuir model at 30 °C. , Adsorption of BDE-47 by living biomass has been shown to be higher than that of nonliving biomass, suggesting that metabolic activity may be involved in enhanced BDE-47 biosorption. Such an increase could be due to specific activity, for example, secretion of extracellular polymeric substances, or alterations to the microenvironment around the cells. , …”

Section: Fate Of Hfrs In Biological Treatment Systemsmentioning

confidence: 99%

“…Physical and chemical pretreatments, such as advanced oxidation, alkalization, acidification, ultrasonication, and thermal pretreatment, are usually adopted to enhance anaerobic digestion of wastewater treatment solids for better biogas production but may also contribute to HFRs transformation. , Panda et al investigated transformation of HBCD by ultrasound-H 2 O 2 and found that 72% of HBCD was mineralized via pyrolytic cleavage, bubble–vapor interface interactions, and free radical attack under optimal conditions within 40 min . Alkaline pretreatment, which can raise the pH of wastewater treatment solids to >12, ,, increases the tendency of ClOPFRs to be hydrolyzed, for example, 80%, 70%, and 70% of TCEP (within 1 day), TCPP (60 days), and TDCPP (1 day) were hydrolyzed at a pH of 12; the rate of ClOPFRs hydrolyzation also increases as pH increases. , Advanced oxidation processes have also been shown to efficiently transform PBDEs and TBBPA. , Amendment of m/n-ZVI, which accelerates anaerobic digestion of wastewater treatment solids, could also abiotically transform the HFRs.…”

Section: Fate Of Hfrs In Biological Treatment Systemsmentioning

confidence: 99%

“…Anaerobic digestion is a promising approach to simultaneously eliminate the harms of and harvest the bioenergy from wastewater treatment solids, including primary sludge and WAS. ,, The general steps for anaerobic digestion of wastewater treatment solids include solubilization, hydrolysis, acidogenesis, and methanogenesis . Efficient anaerobic digestion depends on the collaboration of various functional groups of microorganisms. ,, Exposure to HFRs and associated transformation products can lead to inhibitory or stimulatory effects on different steps of anaerobic digestion and the final impact on anaerobic digestion performance is determined by a trade-off between the enhanced and inhibited steps. , For example, one study showed that exposure to TBBPA in anaerobic sludge reactors significantly increased the quantity of both mcr A and methanogens in the reactor, indicating potential for higher methane production .…”

Section: Effects Of Hfrs On Biological Treatment Systemsmentioning

confidence: 99%

“…127 Interestingly, adsorption of a lesser brominated PBDE, BDE-47, by living Pseudomonas stutzier cells is better characterized by the Langmuir model at 30 °C. 132,133 Adsorption of BDE-47 by living biomass has been shown to be higher than that of nonliving biomass, suggesting that metabolic activity may be involved in enhanced BDE-47 biosorption. Such an increase could be due to specific activity, for example, secretion of extracellular polymeric substances, or alterations to the microenvironment around the cells.…”

Section: Fate Of Hfrs In Biological Treatment Systemsmentioning

confidence: 99%

Section: Effects Of Hfrs On Biological Treatment Systemsmentioning

confidence: 99%

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Insights into the Occurrence, Fate, and Impacts of Halogenated Flame Retardants in Municipal Wastewater Treatment Plants

Zhao

et al. 2021

Environ. Sci. Technol.

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Halogenated flame retardants (HFRs) have been extensively used in various consumer products and many are classified as persistent organic pollutants due to their resistance to degradation, bioaccumulation potential and toxicity. HFRs have been widely detected in the municipal wastewater and wastewater treatment solids in wastewater treatment plants (WWTPs), the discharge and agricultural application of which represent a primary source of environmental HFRs contamination. This review seeks to provide a current overview on the occurrence, fate, and impacts of HFRs in WWTPs around the globe. We first summarize studies recording the occurrence of representative HFRs in wastewater and wastewater treatment solids, revealing temporal and geographical trends in HFRs distribution. Then, the efficiency and mechanism of HFRs removal by biosorption, which is known to be the primary process for HFRs removal from wastewater, during biological wastewater treatment processes, are discussed. Transformation of HFRs via abiotic and biotic processes in laboratory tests and full-scale WWTPs is reviewed with particular emphasis on the transformation pathways and functional microorganisms responsible for HFRs biotransformation. Finally, the potential impacts of HFRs on reactor performance (i.e., nitrogen removal and methanogenesis) and microbiome in bioreactors are discussed. This review aims to advance our understanding of the fate and impacts of HFRs in WWTPs and shed light on important questions warranting further investigation.

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Section: Fate Of Hfrs In Biological Treatment Systemsmentioning

confidence: 99%

Section: Fate Of Hfrs In Biological Treatment Systemsmentioning

confidence: 99%

Section: Effects Of Hfrs On Biological Treatment Systemsmentioning

confidence: 99%

Section: Fate Of Hfrs In Biological Treatment Systemsmentioning

confidence: 99%

Section: Effects Of Hfrs On Biological Treatment Systemsmentioning

confidence: 99%

See 3 more Smart Citations

Insights into the Occurrence, Fate, and Impacts of Halogenated Flame Retardants in Municipal Wastewater Treatment Plants

Zhao

et al. 2021

Environ. Sci. Technol.

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Resilience and functional redundancy of methanogenic digestion microbiome safeguard recovery of methanogenesis activity under the stress induced by microplastics

Liu,

Xu,

Zhao

et al. 2023

mLife

Self Cite

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Microplastics and nanoplastics are emerging pollutants that substantially influence biological element cycling in natural ecosystems. Plastics are also prevalent in sewage, and they accumulate in waste‐activated sludge (WAS). However, the impacts of plastics on the methanogenic digestion of WAS and the underpinning microbiome remain underexplored, particularly during long‐term operation. In this study, we found that short‐term exposure to individual microplastics and nanoplastics (polyethylene, polyvinyl chloride, polystyrene, and polylactic acid) at a low concentration (10 particles/g sludge) slightly enhanced methanogenesis by 2.1%−9.0%, whereas higher levels (30−200 particles/g sludge) suppressed methanogenesis by 15.2%−30.1%. Notably, the coexistence of multiple plastics, particularly at low concentrations, showed synergistic suppression of methanogenesis. Unexpectedly, methanogenesis activity completely recovered after long‐term exposure to plastics, despite obvious suppression of methanogenesis by initial plastic exposure. The inhibition of methanogenesis by plastics could be attributed to the stimulated generation of reactive oxygen species. The stress induced by plastics dramatically decreased the relative abundance of methanogens but showed marginal influence on putative hydrolytic and fermentation populations. Nonetheless, the digestion sludge microbiome exhibited resilience and functional redundancy, contributing to the recovery of methanogenesis during the long‐term operation of digesters. Plastics also increased the complexity, modularity, and negative interaction ratios of digestion sludge microbiome networks, but their influence on community assembly varied. Interestingly, a unique plastisphere was observed, the networks and assembly of which were distinct from the sludge microbiome. Collectively, the comprehensive evaluation of the influence of microplastics and nanoplastics on methanogenic digestion, together with the novel ecological insights, contribute to better understanding and manipulating this engineered ecosystem in the face of increasing plastic pollution.

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The Role of Biomethane in Reaching Net Carbon Zero

Cansdale¹,

Forrester²,

Innard³

et al. 2023

A Sustainable Green Future

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Sludge digestibility and functionally active microorganisms in methanogenic sludge digesters revealed by E. coli-fed digestion and microbial source tracking

Cited by 20 publications

References 67 publications

Insights into the Occurrence, Fate, and Impacts of Halogenated Flame Retardants in Municipal Wastewater Treatment Plants

Insights into the Occurrence, Fate, and Impacts of Halogenated Flame Retardants in Municipal Wastewater Treatment Plants

Resilience and functional redundancy of methanogenic digestion microbiome safeguard recovery of methanogenesis activity under the stress induced by microplastics

The Role of Biomethane in Reaching Net Carbon Zero

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