Enhanced anaerobic co-digestion of waste activated sludge and food waste by sulfidated microscale zerovalent iron: Insights in direct interspecies electron transfer mechanism. (November 2020)

• Record Type: Journal Article
• Authors: Chen, Shengjie; Tao, Ziletao; Yao, Fubing; Wu, Bo; He, Li; Hou, Kunjie; Pi, Zhoujie; Fu, Jing; Yin, Huanyu; Huang, Qi; Liu, Yujie; Wang, Dongbo; Li, Xiaoming; Yang, Qi
• Is Part Of: Bioresource technology. Volume 316(2020)
• Publication Date: 2020-11
• Subjects: Anaerobic co-digestion -- Direct interspecies electron transfer -- Methane -- Microbial community -- Sulfidated microscale zerovalent iron; 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.2020.123901
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: The impact of S-mZVI on the anaerobic co-digestion of WAS and FW was evaluated. The cumulative CH4 yield within 15 days reached to 264.78 mL/g-VS at S-mZVI 10 g/L. S-mZVI had significant influence on the methanogenesis stage of co-digestion. The addition of S-mZVI improved the direct interspecies electron transfer (DIET). Abstract: The enhancement of zerovalent iron (ZVI) on anaerobic digestion (AD) has been proved, but there are still some problems that constrain the large-scale application of ZVI, such as the destruction of cell membrane and the inhibition of methanogenesis led by rapid H2 accumulation. Aiming at these problems, sulfidated microscale zerovalent iron (S-mZVI) was employed to evaluate its effect on anaerobic co-digestion (AcoD) of waste activated sludge (WAS) and food waste (FW). Experimental results showed that S-mZVI promoted the direct interspecies electron transfer (DIET) between specific bacteria and methanogens, resulting in higher methane yield. At S-mZVI 10 g/L, the cumulative methane yield and ETS activity reached 264.78 mL/g-VS and 24.62 mg INTF/(g-TS h), which was 1.33 and 1.83 times that of blank. Microbiological analysis demonstrated that the abundance of DIET-related microorganisms such as Syntrophomonas, Methanosarcina and Methanobacterium increased with the increasing dosage of S-mZVI.