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Anaerobic digestion of sludge by different pretreatments:Changes of amino acids and microbial community

Frontiers of Environmental Science & Engineering 2022年第2期16卷 109-123页

作者： Keke Xiao Zecong Yu Kangyue Pei Mei Sun Yuwei Zhu Sha Liang Huijie Hou Bingchuan Liu Jingping Hu Jiakuan Yang School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Hubei Provincial Engineering Laboratory of Solid Waste Treatment Disposal and Recycle TechnologyWuhan 430074China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China

Many studies have investigated the effects of different pretreatments on the performance of anaerobic digestion of ***,the detailed changes of dissolved organic nitrogen,particularly the release behavior of proteins and the byproducts of protein hydrolysis-amino acids,are rarely known during anaerobic digestion of sludge by different *** we quantified the changes of three types of proteins and 17 types of amino acids in sludge samples solubilized by ultrasonic,thermal,and acid/alkaline pretreatments and their transformation during anaerobic digestion of *** protein,aromatic protein I,aromatic protein II,and cysteine were identified as the key dissolved organic nitrogen responsible for methane production during anaerobic digestion of sludge,regardless of the different pretreatment *** from the depletion of other amino acids,cysteine was resistant to degradation after an incubation period of 30 days in all sludge ***,the“cysteine and methionine metabolism(K00270)”was absent in all sludge samples by identifying 6755 Kyoto Encyclopedia of Genes and Genomes assignments of genes *** contributed to the generation of methane and the degradation of acetic,propionic,and n-butyric acids through decreasing oxidation-reduction potential and enhancing biomass *** study provided an alternative strategy to enhance anaerobic digestion of sludge through in situ production of cysteine.

关键词： sludge pretreatments Dissolved organic nitrogen Proteins Amino acids Structural equation model Metagenomic sequencing analysis

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