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

• DOI: 10.3389/fmicb.2022.963260
• Publication Date: 2022-07-22T15:26:22Z
• Authors: Jie Wang; Xingguo Liu; Jinling He; Guofeng Cheng; Junli Xu; Ming Lu; Yuyi Shangguan; Ai Zhang
• Keywords: Extracellular polymeric substance; Methanosaeta

The mechanism of improving the anaerobic fermentation performance waste active sludge by using dielectric barrier discharge (DBD) plasma pretreatment technology was investigated. maximum accumulation short-chain fatty acids (SCFAs) observed on 7th day when DBD power 76.50 W, which 1726.70 mg COD/L, 1.50 times control group. ratio acetic acid in group 9.30% higher than that control. Further research indicated can destroy structure extracellular polymer substances and release organic such as protein polysaccharide. dissolved matter analysis technique could increase biodegradable organics (eg., tyrosine proteins, soluble microbial by-products), thus accelerate biotransformation substance. Bacterial community showed abundance Firmicutes Bacteroidetes decrease Proteobacteria were beneficial to SCFAs. Besides, further archaeal Methanosaeta sp. Methanosarcina sp . facilitate accumulation. This study demonstrated be used an effective potential method improve performance.