COMPARING MESOPHILIC AND THERMOPHILIC ANAEROBIC DIGESTION OF CHICKEN MANURE: MICROBIAL COMMUNITY DYNAMICS AND

TÍTULO

COMPARING MESOPHILIC AND THERMOPHILIC ANAEROBIC DIGESTION OF CHICKEN MANURE: MICROBIAL COMMUNITY DYNAMICS AND PROCESS RESILIENCE

DOCUMENTO - ARTIGO CIENTÍFICO

AUTORES - QIGUI NIU; YASUYUKI TAKEMURA;  KENGO KUBOTA; YU-YOU LI.

RESUMO/ABSTRACT

While methane fermentation is considered as the most successful bioenergy treatment for chicken manure, the relationship between operational performance and the dynamic transition of archaeal and bacterial communities remains poorly understood. Two continuous stirred-tank reactors were investigated under thermophilic and mesophilic conditions feeding with 10%TS. The tolerance of thermophilic reactor on total ammonia nitrogen (TAN) was found to be 8000 mg/L with free ammonia (FA) 2000 mg/L compared to 16,000 mg/L (FA1500 mg/L) of mesophilic reactor. Biomethane production was 0.29 L/gV Sin in the steady stage and decreased following TAN increase. After serious inhibition, the mesophilic reactor was recovered successfully by dilution and washing stratagem compared to the unrecoverable of thermophilic reactor. The relationship between the microbial community structure, the bioreactor performance and inhibitors such as TAN, FA, and volatile fatty acid was evaluated by canonical correspondence analysis. The performance of methanogenic activity and substrate removal efficiency were changed significantly correlating with the community evenness and phylogenetic structure. The resilient archaeal community was found even after serious inhibition in both reactors. Obvious dynamics of bacterial communities were observed in acidogenic and hydrolytic functional bacteria following TAN variation in the different stages.

Profissionais, estudantes e interessados na cadeia do biogás e, atuantes nas diversas áreas, etapas de projetos ou operação na produção de biogás.