Regulation of anaerobic fermentation for producing short-chain fatty acids from primary sludge in WWTPs by different alkalis

Jian, Wang; Li, Guohua; Shao, Yuting; Zhang, Qian; Qi, Wei; Luo, Fangzhou; Sun, Wenzhuo; Лю, Шуай; Liu, Yuchen; Zhang, Jingbing; Qi, Lu; Wang, Hongchen

doi:10.1016/j.jenvman.2021.113623

Cited by 21 publications

(7 citation statements)

References 35 publications

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“…In general, anaerobic microbes play a vital role in SCFA production during sludge fermentation. , The effects of CTAB on the microbial community in two sludge fermenters with or without CTAB addition were explored by Illumina MiSeq sequencing. Venn analysis reflected the similarity, uniqueness, and diversity of microorganisms between the two fermenters .…”

Section: Resultsmentioning

confidence: 99%

“…On the contrary, CTAB reduced the percentage of propionic acid significantly, which declined from 67.2% (0 g/g TSS CTAB) to 28.0% (0.03 g/g TSS CTAB) and gradually increased to 44.1% (0.12 g/g TSS CTAB). The increase in acetic acid may be due to the degradation of propionic acid, butyric acid, and valeric acid by anaerobic microorganisms through various metabolic pathways (e.g., β-oxidation) . In WWTPs, acetic acid as a carbon source is more beneficial than other acids for the removal of biological nutrients .…”

Section: Resultsmentioning

confidence: 99%

“…The increase in acetic acid may be due to the degradation of propionic acid, butyric acid, and valeric acid by anaerobic microorganisms through various metabolic pathways (e.g., βoxidation). 32 In WWTPs, acetic acid as a carbon source is more beneficial than other acids for the removal of biological nutrients. 5 Therefore, CTAB increases both the yield and the quality of SCFAs during WAS fermentation.…”

Section: Yield Of Scfas During Was Fermentation Withmentioning

confidence: 99%

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Cetyltrimethylammonium Bromide Enhances Anaerobic Fermentative Production of Short-Chain Fatty Acids from Waste Activated Sludge

Li,

Liu

et al. 2023

ACS EST Eng.

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Anaerobic fermentation for short-chain fatty acid (SCFA) production has attracted much attention in the field of waste activated sludge (WAS) treatment. However, the SCFA yield is limited. This study reports a new, efficient, and cost-effective strategy to improve SCFA production from anaerobic fermentation of WAS by cetyltrimethylammonium bromide (CTAB) intervention. Experimental results proved that CTAB improved the yield and quality of SCFAs: a SCFA yield of 273.5 mg of COD/g of volatile suspended solids (VSS) was obtained at 0.03 g/g total suspended solid CTAB addition, which improved by 443% compared with the control (50.3 mg of COD/g of VSS); the percentage of acetic acid raised from 5.6% (without CTAB) to 33.7–44.2% (with CTAB). Mechanism exploration established that CTAB enhanced the disintegration of WAS and improved the biodegradability of released organics, thus offering more available substances for SCFA production. Microbial community analyses showed that CTAB increased the relative abundance of hydrolytic microorganisms (e.g., IMCC26207 and unclassified_f__Enterobacteriaceae) and SCFA producers (e.g., Romboutsia and Escherichia-Shigella), and reduced the relative abundances of SCFA consumers (e.g., Candidatus_Competibacter), which were conducive to SCFA accumulation. The economic analysis showed that CTAB intervention exhibited a comparable or higher economic benefit over some traditional pretreatment approaches (e.g., thermal and CaO2-based advanced oxidation) for WAS anaerobic fermentation. The findings of this study expand the application field of CTAB and provide new insights into WAS anaerobic fermentation technology.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Yield Of Scfas During Was Fermentation Withmentioning

confidence: 99%

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Cetyltrimethylammonium Bromide Enhances Anaerobic Fermentative Production of Short-Chain Fatty Acids from Waste Activated Sludge

Li,

Liu

et al. 2023

ACS EST Eng.

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“…Recent studies have shown that particulate organic matter (POM), which is mainly composed of proteins, polysaccharides, and oils discharged from human activities, in the influent of WWTPs in China accounts for 40% to 60% of the total chemical oxygen demand (TCOD) [4][5][6]. The chemical composition and size distribution of POM will vary greatly with the source of sewage, living habits of residents, economic level, and sewage discharge methods.…”

Section: Introductionmentioning

confidence: 99%

“…Yanqing Duan et al [13] used the solid organic matter retained by the microsieve as the substrate to study the effect of the initial alkaline adjustment on the fermentation and properties of cellulose components, and discovered that the VFA yield was the highest when the pH was 10.5, and alkaline treatment promoted polysaccharide release and inhibited methane production. Jian Wang et al [6] studied the effect of different alkalis (NaOH, Na 2 CO 3 , and Ca(OH) 2 ) on acid production from anaerobic fermentation of primary sludge, and found that all three types of alkalis can enhance the hydrolysis acidification effect and reduce methane production, but Na 2 CO 3 can stably improve the yield of short-chain fatty acids (SCFAs) in a continuous reaction system.…”

Section: Introductionmentioning

confidence: 99%

Effects of pH Adjustment on the Release of Carbon Source of Particulate Organic Matter (POM) in Domestic Sewage

et al. 2022

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The use of anaerobic hydrolytic fermentation to develop more available carbon sources from domestic sewage influent particulate organic matter (POM) has received increasing attention. However, the slow hydrolysis rate of POM limits the application of this technology. This study aimed to improve the carbon source release efficiency of POM by pH adjustment and to reveal the hydrolysis mechanism. Results showed that adjusting the initial pH of POM to 3, 9, and 11 enhanced carbon source release in the anaerobic hydrolysis fermentation process of POM. The pretreatment under pH value of 11 contributed to the highest yield and productivity of carbon source, reaching the soluble chemical oxygen demand (SCOD) of 2782 mg/L at the 4th day. The pH 3 pretreatment was more beneficial for phosphorus resource recovery, which contributed to the highest release concentration of PO43−-P, reaching 48.2 mg/L at the 3rd day, accounting for 90% of TP. Microbial community structure analysis indicated that pH 11 preconditioning promoted the enrichment of proteolytic bacteria (Proteocatella and Proteiniclasticum) and polysaccharide hydrolytic bacteria (Trichococcus and Acinetobacter) and inhibited the growth of acetate-consuming methanogenic archaea, which contributed to the highest carbon release of POM in domestic sewage.

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A review of the eco-revolution of organic carbon capture in wastewater treatment: limitations and coupled processes

Fu,

Li,

Zhang

2024

Int. J. Environ. Sci. Technol.

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Regulation of anaerobic fermentation for producing short-chain fatty acids from primary sludge in WWTPs by different alkalis

Cited by 21 publications

References 35 publications

Cetyltrimethylammonium Bromide Enhances Anaerobic Fermentative Production of Short-Chain Fatty Acids from Waste Activated Sludge

Cetyltrimethylammonium Bromide Enhances Anaerobic Fermentative Production of Short-Chain Fatty Acids from Waste Activated Sludge

Effects of pH Adjustment on the Release of Carbon Source of Particulate Organic Matter (POM) in Domestic Sewage

A review of the eco-revolution of organic carbon capture in wastewater treatment: limitations and coupled processes

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