Effects of hydrochar and co-substrate on phenol anaerobic degradation
Anaerobic digestion(AD)is a sustainable biotechnology,which has been applied in the treatment of organic waste.Refractory phenolic compounds,as the main toxic substances in the anaero-bic digestion process,usually undergo complex and slow degradation.The addition of hydrochar and co-substrates has been found to effectively enhance the efficiency of phenol anaerobic digestion.This study investigated the simultaneous addition of hydrochar and co-substrates and its impact on anaerobic degradation of phenol.Results indicated that the addition of hydrochar and co-substrates reduced the lag phase of phenol anaerobic digestion,shortening it from 77.5 days in the control to 24.6～59.3 days.When hydrochar and co-substrates were added simultaneously,the maximum methane production rate(Rm)increased from 3.53 mL/d to 4.86～6.80 mL/d.However,when only co-substrates were added and the concentration was too high,it hindered the stimulation of Rm.The optimal concentration for glucose co-substrate addition was approximately between 1.0 and 2.0 g/L.A high concentration of glu-cose in the environment might enrich other competitive microorganisms,leading to the inhibition of benzoic acid-degrading bacteria and acetate-consuming methane-producing bacteria.Hydrochar also promoted the enrichment of benzoic acid degraders,but the influence of glucose co-substrate concen-tration on community composition was mitigated in the presence of hydrochar.This study utilized hydro-char and co-substrates to enhance anaerobic degradation of phenol,providing a novel approach to im-prove the efficiency of phenol anaerobic digestion.
HydrcharPhenol degradationCo-metabolismAnaerobic digestionMicrobial community
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维普
