Metaproteomics reveals major microbial players and their biodegradation functions in a large-scale aerobic composting plant Dongming Liu,1,2 Mingxiao Li,2 Beidou Xi,2 Yue Zhao,1 Zimin Wei,1* Caihong Song1,2 and Chaowei Zhu2 1College of Life Sciences, Northeast Agricultural University, Harbin 150030, China. 2Innovation Base of Groundwater and Environmental