Effects of magnesium chloride on the anaerobic digestion and the implication on forward osmosis membrane bioreactor for sludge anaerobic digestion. (November 2018)

• Record Type: Journal Article
• Authors: Zhao, Jing; Li, Yunqian; Pan, Shuang; Tu, Qianqian; Dang, Wenyue; Wang, Zhuo; Zhu, Hongtao
• Is Part Of: Bioresource technology. Volume 268(2018)
• Page Start: 700
• Page End: 707
• Publication Date: 2018-11
• Subjects: Anaerobic digestion -- Forward osmosis -- Membrane bioreactor -- Microbial community -- Magnesium chloride; 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.2018.08.002
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Effects and mechanism of MgCl2 on AD of real waste sludge were investigated. CH4 production was badly affected when MgCl2 concentration was more than 30 g/L. High correlation between Live/Dead and methane production was found. MgCl2 exerted greater influences on archaeal community than bacterial community. Abstract: This work elucidates the effects of model reversed salt MgCl2 on methane production in an anaerobic digestion bioreactor treating waste sludge. Along with MgCl2 concentration being raised stepwise, the methane production was only slightly less than in the control when MgCl2 was 20 g/L and under, and then suddenly reduced to only about 10 mL/(L·d) at a MgCl2 concentration of 30 g/L, and finally stopped when the MgCl2 concentration reached 50 g/L. However, the total relative abundance of methanogens Methanomicrobia and Methanobacteria still accounted for 84.97% of the archaeal community when MgCl2 was 50 g/L. The high correlation between live/dead cell ratio and methane production suggests that the live/dead cell ratio instead of the inhibition of methanogen might be the major cause for the halt of methane production at a magnesium chloride concentration of 50 g/L.