Effect of ammonia exposure and acclimation on the performance and the microbiome of anaerobic digestion
2020
Puig-Castellví, Francesc | Cardona, Laëtitia | Bureau, Chrystelle | Bouveresse, Delphine Jouan-Rimbaud | Cordella, Christophe B.Y. | Mazéas, Laurent | Rutledge, D. N. (Douglas N.) | Chapleur, Olivier
In this study, the effect of ammonia (NH₃) as a disturbance on the microbial communities during anaerobic digestion (AD) was examined. NH₃ was progressively added into 5 stabilized semi-continuous bio-reactors containing biowaste at 5 different NH₃ loading rates until an inhibitory concentration was reached, and maintained at this concentration for 3 hydraulic retention times (75 days). The performance and the microbial community of the digesters were analyzed. The digesters performances were hindered at higher NH₃ loading rates, marked by lower biogas productions and the accumulation of volatile fatty acids. At the microbial community level, changes depended on the NH₃ loading rate. For instance, the digester with the highest NH₃ loading rate showed a hydrogenotrophic methanogenic profile resulting from the growth of Methanosarcina spp. and acetate-consuming microorganisms, as well as the restricted growth of obligate acetoclastic archaea. This work can be helpful for the design of future acclimation strategies in AD.
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