Effect of lignin on short-chain fatty acids production from anaerobic fermentation of waste activated sludge

Enhanced anaerobic digestion of waste activated sludge with periodate-based pretreatment

“…It suggested that the microbial diversity declined after PI pretreatment. The quantities of individual OTUs in the experimental digester decreased from 300 to 217, suggesting that PI might cause a new type of digestion environment [ 32 ]. Alpha diversity results in Fig.…”

“…During the anaerobic digestion process, the solubilization and hydrolysis of sludge flocs occur simultaneously [ 31 ]. As previously reported [ 32 ], the hydrolysis efficiency could be quantitatively estimated by ΔSCOD/TCOD, where TCOD was the initial total COD of WAS and ΔSCOD was the difference between the initial and terminal COD. The biodegradability of fermentation liquor was analyzed through the percent fluorescence response (P i,n ) of EEM and more details were described in Supplementary Material.…”

Novel Insights into the Mechanisms of Periodate-Based Pretreatment in Enhancing Short-Chain Fatty Acids from Waste Activated Sludge

“…When the organic substances are released via WAS solubilization, they immediately take part in the hydrolysis, acidogenesis, acetogenesis, and methanogenesis. 7 As illustrated in Figure 5A, macromolecule organics such as polysaccharides and proteins were hydrolyzed to monosaccharides and aminos catalyzed by extracellular hydrolytic enzymes (e.g., protease and α-glucosidase) in the hydrolytic process. The small molecules passed through the cell membranes into the cytoplasm, and were subsequently converted to pyruvate and SCFAs in the acidification step with the assistance of several acidifying enzymes (such as acetate kinase).…”

Mechanism of dielectric barrier discharge plasma technology to improve the quantity of short-chain fatty acids in anaerobic fermentation of waste active sludge

“…If it is not treated timely and effectively, it will cause serious harm to the environment (Jin et al, 2014;Chen et al, 2018;Patel et al, 2021). Therefore, the safe, effective, and economic disposal of sludge has always been one of the major problems that need to be solved urgently in the environmental field (Jin et al, 2021;He et al, 2022). The technology of sludge resource utilization has a good application prospect (Lee et al, 2014;Wu et al, 2021).…”

“…Anaerobic fermentation technology is a commonly used means of sludge recycling in recent years, that is, the process of microbial degradation of organic compounds and their conversion into recyclable carbon resources in an anaerobic environment (Luo et al, 2021(Luo et al, , 2022Yang et al, 2022). Anaerobic fermentation process has the advantages of low energy consumption, high organic load, and no pollution (Wang et al, 2021(Wang et al, , 2022aHe et al, 2022). It can not only reduce the sludge, but also produce products with high added value, which can effectively promote the resource utilization of sludge (Liang et al, 2021;Wang et al, 2022b,c).…”