Improvement of sewage sludge anaerobic digestion through synergistic effect combined trace elements enhancer with enzyme pretreatment and microbial community response. (January 2022)

• Record Type: Journal Article
• Authors: Jiang, Xinru; Lyu, Qingyang; Bi, Liefeng; Liu, Yang; Xie, Yandong; Ji, Gaosheng; Huan, Chenchen; Xu, Lishan; Yan, Zhiying
• Is Part Of: Chemosphere. Volume 286:Part 1(2022)
• Publication Date: 2022-01
• Subjects: Sewage sludge -- Anaerobic digestion -- Enzyme pretreatment -- Trace elements -- Hydrogenotrophic methanogens; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.131356
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In this study, a double E strategy (enzymes and enhancer) characterized by high efficiency for enhancing sewage sludge anaerobic digestion (AD) is proposed. This strategy combines addition of trace elements (TEs) enhancer and enzyme pretreatment, inducing a synergistic effect on AD, and it is more effective and economical compared with TEs addition or enzyme pretreatment in isolation. When adding 400 U/g cocktail enzymes and 1.24% trance elements enhancers, the cumulative methane production and the maximum daily methane increased yield by 45.29% and 84.7%, respectively. According to microbial community analysis, the double E strategy significantly motivate the growth of acetogens and protein fermenting bacterium. The relative abundance of Fermentimonas and Lutispora increased by 6.15% and 5.4%, respectively. Archaeal community analysis and changes in the mcrA gene abundance demonstrate enrichment of hydrogenotrophic methanogens, with the methanogens exhibiting high vitalities and stress resistance. The double E strategy could be a promising way to improve industrial sewage sludge AD efficiency. Graphical abstract: Image 1 Highlights: Soluble protein content increased by 47.7% under low enzymes pretreatment. Enzymes and enhancers induced a synergistic effect on anaerobic digestion. Protein fermenting bacterium were abundant under the synergistic strategy. Hydrogenotrophic methanogens exhibiting high vitalities and stress resistance.