Long term effect of alkali types on waste activated sludge hydrolytic acidification and microbial community at low temperature. (January 2016)

• Record Type: Journal Article
• Authors: Jin, Baodan; Wang, Shuying; Xing, Liqun; Li, Baikun; Peng, Yongzhen
• Is Part Of: Bioresource technology. Volume 200(2016)
• Page Start: 587
• Page End: 597
• Publication Date: 2016-01
• Subjects: Waste activated sludge -- Low temperature fermentation -- Hydrolytic acidification -- Alkali type -- Microbial community; 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.2015.10.036
• Languages: English
• ISSNs: 0960-8524

Abstract

Abstract : Graphical abstract: Highlights: WAS alkaline fermentation was achieved at low temperature. Alkaline type was critical for hydrolysis. SCFAs production in alkaline fermentation systems benefited several functional bacteria. Anaerolineae and F420 were suppressed effectively in the Ca(OH)2 fermentation system. Ca(OH)2 fermentation system had a strong acidification ability. Abstract: The effect of four alkali reagents (NaOH, KOH, Ca(OH)2, mixed alkali) on waste activated sludge (WAS) hydrolytic acidification and microbial community was studied in semi-continuous fermentation systems at low temperature (15 °C) over long term operational time (65 day). The results showed that protein and polysaccharide of NaOH (124.26, 11.92) was similar to that of KOH (109.53, 11.30), both were higher than Ca(OH)2 (70.66, 3.74) and mixed alkali (90.66, 8.71). The short chain fatty acids (SCFAs) of NaOH (231.62) was higher than KOH (220.62 mg chemical oxygen demand (COD)/g VSS). Although Ca(OH)2 system had strong acidification capacity, the shortage of SCFAs occurred due to the low activity of hydrolase. Illumina MiSeq sequencing revealed that Tissierella and Erysipelothrix were enriched in the NaOH and Ca(OH)2 systems, where Peptostreptococcaceae incertae_sedis was enriched in the NaOH and KOH systems, less Anaerolinea was involved in Ca(OH)2 condition.