Performance, kinetics behaviors and microbial community of internal circulation anaerobic reactor treating wastewater with high organic loading rate: Role of external hydraulic circulation. (December 2016)

• Record Type: Journal Article
• Authors: Luo, Gan; Li, Jun; Li, Yan; Wang, Zhu; Li, Wen-Tao; Li, Ai-Min
• Is Part Of: Bioresource technology. Volume 222(2016)
• Page Start: 470
• Page End: 477
• Publication Date: 2016-12
• Subjects: Internal circulation anaerobic (IC) reactor -- Volatile fatty acids (VFA) -- Kinetics behavior -- Microbial community -- High-throughput sequencing; 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.2016.10.023
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: The critical OLR for IC reactor effectively operation was close to 19 kgCOD/m 3 /d. Withdrawal of external hydraulic circulation led to deterioration of IC reactor. Substrate metabolic pathway shifted from propionate to hybrid fermentation. Kinetics of substrate degradation and methane production was studied. High-throughput sequencing showed the shift of bacterial and archaea community. Abstract: Performance of internal circulation anaerobic reactor (IC) treating wastewater at high organic loading rate (OLR) and role of external hydraulic circulation were evaluated. When the OLR was increased from 2.50 to 18.94 kgCOD/m 3 /d, COD removal decreased to 85% slightly and methane production increased to 4.49 L/L/d with the upflow velocity of 1.0 m/h resulted from the additional hydraulic circulation. Withdrawal of external hydraulic circulation led to decrease of COD removal to lower than 60% drastically and methane production by 81%. Accumulation of volatile fatty acids caused decline of pH to below 6.0 and the shift of substrate metabolic pathway to the hybrid fermentation. In addition, both maximum methane production rate and maximum substrate degradation rate obtained from mathematical models decreased significantly. Hydrogenotrophic methanogens including Methanobacterium and Methanocorpusculum predominated in the anaerobic sludge and the shift of microbial community was also observed.