Enhanced production of short-chain fatty acids from waste activated sludge by addition of magnetite under suitable alkaline condition. (October 2019)

• Record Type: Journal Article
• Authors: Lu, Donghui; Xing, Bo; Liu, Yuhan; Wang, Zhirong; Xu, Xiangyang; Zhu, Liang
• Is Part Of: Bioresource technology. Volume 289(2019)
• Publication Date: 2019-10
• Subjects: Anaerobic fermentation -- Waste activated sludge (WAS) -- Magnetite -- Alkaline condition -- Short-chain fatty acids (SCFAs); Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.121713
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: SCFAs yield increased with the studied magnetite-amended strategy. Related enzyme activities and abundance of acidogenic bacteria were improved. The release of PO4 3− -P reduced with the studied magnetite-amended strategy. A novel process was proposed to recover carbon and phosphorus sources simultaneously. Abstract: Alkaline fermentation technology is an effective method for resource recovery, e.g., short-chain fatty acids (SCFAs), but the acidification process needs to be further enhanced. To improve the release and acidification of organic matters in waste activated sludge (WAS) fermentation simultaneously, a novel method was proposed with magnetite addition under alkaline condition in this study. Compared with the control, SCFAs and acetic acids yields increased by 21.2% ± 3.1% and 31.0% ± 1.2% in the 0.6 g/gVSS magnetite-based system, respectively. Besides, the activities of α-glucosidase, protease and acetate kinase (AK) were enhanced with magnetite addition, and the abundance of acidogenic microbes was improved obviously. Furthermore, magnetite reduced the release of PO4 3− -P significantly via the precipitation reaction. Of all, a novel side-stream WAS hydrolysis and acidification process based on magnetite addition under suitable alkaline condition is proposed, realizing the efficient recovery of carbon and phosphorus resources along with wastewater and WAS treatment.