Iron electrodes activating persulfate enhances acetic acid production from waste activated sludge

Wu, Yanxin; Liu, Xuran; Wang, Dongbo; Chen, Yaoning; Yang, Qi; Chen, Yanrong; Hu, Xuyue; Xu, Qiuxiang; Fu, Qizi; Du, Chunyan

doi:10.1016/j.cej.2020.124580

Cited by 21 publications

(6 citation statements)

References 35 publications

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“…The COD mass balance analysis was carried out based on our previous study, with the chitosan proportion being ignored . The measurement of the methane content in biogas, particle size distribution of sludge, EPS content and structures, and chitosan and its potential metabolites and the quantification and characteristic of chitosan and its major metabolites were performed according to the published literature studies ,− and are specifically described in the Supporting Information. Significance of experimental data was evaluated using the least significant difference test, and p < 0.05 was treated as statistically significant.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…16−18 If the substrates are in solid form such as particulate organics, they need to be solubilized before hydrolysis. 19,20 Therefore, any factors affecting either these microbes or the organic metabolisms would finally influence the anaerobic digestion process as well as the carbon cycle. For example, 15−150 MPs/L of polyvinyl chloride microplastics and 75−300 MP/L of polyethylene terephthalate (two representative waterinsoluble polymers) were reported to be toxic to anaerobic metabolism processes and thereby resulted in decreases in methane production.…”

Section: Introductionmentioning

confidence: 99%

“…Anaerobic digestion process generally involves hydrolysis of macromolecular organics (e.g., proteins and carbohydrates), which occurs by hydrolytic microbes, acidogenesis of micromolecular organic substrates, which occurs by acid-producing bacteria, and methanogenesis of acetate and H 2 , which occurs by acetate-dependent and CO 2 -dependent methanogens. − If the substrates are in solid form such as particulate organics, they need to be solubilized before hydrolysis. , Therefore, any factors affecting either these microbes or the organic metabolisms would finally influence the anaerobic digestion process as well as the carbon cycle. For example, 15–150 MPs/L of polyvinyl chloride microplastics and 75–300 MP/L of polyethylene terephthalate (two representative water-insoluble polymers) were reported to be toxic to anaerobic metabolism processes and thereby resulted in decreases in methane production. , However, knowledge of chitosan impacts on anaerobic digestion is still limited.…”

Section: Introductionmentioning

confidence: 99%

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How Does Chitosan Affect Methane Production in Anaerobic Digestion?

Liu

et al. 2021

Environ. Sci. Technol.

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The expanding use of chitosan in sewage and sludge treatment processes raises concerns about its potential environmental impacts. However, investigations of the impacts of chitosan on sewage sludge anaerobic digestion where chitosan is present at substantial levels are sparse. This study therefore aims to fill this knowledge gap through both long-term and batch tests. The results showed that 4 g/kg total suspended solid (TSS) chitosan had no acute effects on methane production, but chitosan at 8–32 g/kg TSS inhibited methane production by 7.2–30.3%. Mass balance and metabolism of organic analyses indicated that chitosan restrained the transfer of organic substrates from solid phase to liquid phase, macromolecules to micromolecules, and finally to methane. Further exploration revealed that chitosan suppressed the secretion of extracellular polymeric substances of anaerobes by occupying the connection sites of indigenous carbohydrates and increased the mass transfer resistance between anaerobes and substrates, which thereby lowered the metabolic activities of anaerobes. Although chitosan could be partly degraded by anaerobes, it is much more persistent to be degraded compared with indigenous organics in sludge. Microbial community and key enzyme encoding gene analyses further revealed that the inhibition of chitosan to CO2-dependent methanogenesis was much severer than that to acetate-dependent methanogenesis.

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Section: Materials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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How Does Chitosan Affect Methane Production in Anaerobic Digestion?

Liu

et al. 2021

Environ. Sci. Technol.

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“…The environment-friendly feature of the ODS processes based on the combination of H 2 O 2 and formic or acetic acid is that these organic acids can be obtained from RRM (e.g., CO 2 and H 2 ) and waste (e.g., waste activated sludge biomass, agricultural waste, etc.) in the course of the green chemistry processes [103][104][105][106][107].…”

Section: Choosing Reagents Ensuring a High Desulfurization Efficiency And Compliant With The Green Chemistry Principlesmentioning

confidence: 99%

Nanocatalysts for Oxidative Desulfurization of Liquid Fuel: Modern Solutions and the Perspectives of Application in Hybrid Chemical-Biocatalytic Processes

et al. 2021

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In this paper, the current advantages and disadvantages of using metal-containing nanocatalysts (NCs) for deep chemical oxidative desulfurization (ODS) of liquid fuels are reviewed. A similar analysis is performed for the oxidative biodesulfurization of oil along the 4S-pathway, catalyzed by various aerobic bacterial cells of microorganisms. The preferences of using NCs for the oxidation of organic sulfur-containing compounds in various oil fractions seem obvious. The text discusses the development of new chemical and biocatalytic approaches to ODS, including the use of both heterogeneous NCs and anaerobic microbial biocatalysts that catalyze the reduction of chemically oxidized sulfur-containing compounds in the framework of methanogenesis. The addition of anaerobic biocatalytic stages to the ODS of liquid fuel based on NCs leads to the emergence of hybrid technologies that improve both the environmental characteristics and the economic efficiency of the overall process. The bioconversion of sulfur-containing extracts from fuels with accompanying hydrocarbon residues into biogas containing valuable components for the implementation of C-1 green chemistry processes, such as CH4, CO2, or H2, looks attractive for the implementation of such a hybrid process.

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“…Anaerobic digestion is widely applied to remove pollutants (e.g., pathogens and organic pollutants) in WAS and harvest renewable energy via biogas production 8 . Successful methanogenic digestion of WAS accounts for a collection of microbes that catalyze hydrolysis, acidogenesis, and methanogenesis 9 . Despite the fact that microplastics and nanoplastics are prevalent in WAS, we are at the nascent stage of understanding their impacts on subsequent methanogenic digestion and the underpinning microbial communities.…”

Section: Introductionmentioning

confidence: 99%

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

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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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Iron electrodes activating persulfate enhances acetic acid production from waste activated sludge

Cited by 21 publications

References 35 publications

How Does Chitosan Affect Methane Production in Anaerobic Digestion?

How Does Chitosan Affect Methane Production in Anaerobic Digestion?

Nanocatalysts for Oxidative Desulfurization of Liquid Fuel: Modern Solutions and the Perspectives of Application in Hybrid Chemical-Biocatalytic Processes

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

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