Hyperthermophilic pretreatment composting can reduce ammonia emissions by controlling proteolytic bacterial community and the physicochemical properties

Abstract Proteolysis is the rate-limiting step in mineralization of organic nitrogen into ammonium (NH 4 + ) and thereby ammonia 3 released during composting. However, dynamics bacterial proteolytic communities related to NH emissions composting systems are mostly unknown. This study aimed examine compare effects hyperthermophilic pretreatment (HPC) traditional (TC) methods on (i) difference loss nitrogenous compounds; (ii) community involved proteolysis (iii) correlation between community, biophysiochemical characteristics loss. Results revealed that HPC decreased by 42% as compared TC 60-day period. was accompanied with an inhibitory effect protease activity where relative abundances bacteria ( Bacillus megaterium Staphylococcus cohnii were reduced significantly TC. Partial least-squares path modeling suggested various physicochemical properties such higher temperature well lower C/N ratio played a dominant role affecting abundance bacteria, which may have been important factor contributing HPC. All these findings lead us conclude can reduce inhibiting responsible for release. Graphical