Metabolic adaptation of microbial communities to ammonium stress in a high solid anaerobic digester with dewatered sludge.

ABSTRACT: A high solid digester with dewatered sludge was operated for 110 days to ascertain the interactions between bacterial and archaeal communities under ammonium stress, as well as the corresponding changes in bio-degradation mechanisms. The volatile solids reduction (95% confidence intervals in mean) changed from 31.6 ± 0.9% in the stable period (day 40-55) to 21.3 ± 1.5% in the last period (day 71-110) when ammonium concentration was elevated to be within 5,000-6,000 mgN/L. Biogas yield dropped accordingly from 11.9 ± 0.3 to 10.4 ± 0.2 L/d and carbon dioxide increased simultaneously from 35.2% to 44.8%. Anaerobranca better adapted to the ammonium stress, while the initially dominant protein-degrading microbes-Tepidimicrobium and Proteiniborus were suppressed, probably responsible for the inc

SUBMITTER: Dai X 

PROVIDER: S-EPMC4911566 | biostudies-literature | 2016 Jun

REPOSITORIES: biostudies-literature