Effect of fillers on key characteristics of sludge thermophilic anaerobic digestion. (October 2015)

• Record Type: Journal Article
• Authors: Shao, Liming; Xu, Yuanshun; Wang, Tianfeng; Lü, Fan; He, Pinjing
• Is Part Of: Bioresource technology. Volume 193(2015)
• Page Start: 415
• Page End: 423
• Publication Date: 2015-10
• Subjects: Anaerobic digestion efficiency -- Dewaterability -- Filler -- 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.2015.06.137
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Filler-system improved digestion efficiency and digestate dewaterability. Fillers ameliorated the constitution of the microbial population. Effect of HRT on filler-system was explored. Abstract: In anaerobic digestion (AD) of sludge, AD efficiency and digested sludge (DS) dewaterability are critical factors. In this study, polyester non-woven fabric fillers were integrated into a sludge digester. The effect of such fillers on digestion was investigated in thermophilic temperature range in semi-continuous mode. Methane production of filler system and control reactor were significantly different ( P < 0.05, paired t -test). At hydraulic retention times of 18 days and 12 days, the corresponding methane yields from filler system were 140% and 161%, respectively, of the yields from control digester without filler. Improvement of DS dewaterability was uncertain during 110 days of operation. While after a longer period of digestion, filler system resulted in a lower normalized capillary suction time of DS (76.5 ± 21.6 s L/g total suspended solids) than control reactor (118.7 ± 32.9 s L/g total suspended solids). The results showed that the filler could improve thermophilic AD performance, except at too short hydraulic retention times.