Effects of thermal hydrolysis on the metabolism of amino acids in sewage sludge in anaerobic digestion

摘要

Three semi-continuous anaerobic digesters with raw sludge (R1) or thermally hydrolyzed sludge (120 degrees C (R2) or 160 degrees C (R3)) were operated to investigate the effects of thermal hydrolysis on the metabolism of amino acids during high solid anaerobic digestion with sewage sludge. Thermal hydrolysis pretreatment (THP) decomposed protein in terms of hydrolytic amino acid in raw sludge by 8.90% and 26.69% under 120 degrees C and 160 degrees C, respectively. The decomposition of amino acids during THP was the main contributor to the final enhanced amino acids degradation in sewage sludge with THP after anaerobic digestion. The dominating bacterial genera related to amino acids degradation in R2 and R3 shifted to Fastidiosipila and ProteiniphilumJTissierella, respectively, from Gelria in R1, influencing the utilization of amino acids, especially glutamic acid, glycine and proline. Different from 120 degrees C, THP at 160 degrees C played an important role in promoting amino acid metabolism during AD through the Stickland pathway by the bacteria belonged to order Clostridiales. (C) 2019 Elsevier Ltd. All rights reserved.