Anaerobic digestion is one of the effective ways to treat sewage sludge and organic waste,which can generate abundant clean energy.However,there are some problems in the actual operation,such as unstable di-gesters,prone to ammonia and acid inhibition.Biochar is widely used as an adsorbent to remove toxic metals and organic pollution from wastewater,and adding biochar can effectively alleviate acid accumulation and am-monia inhibition and improve the methanogenic capacity of anaerobic digestion.The physicochemical properties of biochar and its surface characteristics were analyzed to investigate the principles of biochar to enhance the buffering capacity of the anaerobic digestion system and alleviate ammonia inhibition,and the effects of biochar on microbial community structure in anaerobic digestion system were discussed.
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