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Impact of anti-acidification microbial consortium on carbohydrate metabolism of key microbes during food waste composting

Song, Caihong, Li, Mingxiao, Qi, Hui, Zhang, Yali, Liu, Dongming, Xia, Xunfeng, Pan, Hongwei, Xi, Beidou
Bioresource technology 2018 v.259 pp. 1-9
biochemical pathways, biotransformation, carbohydrate metabolism, cellulose, composting, enzymes, food waste, hemicellulose, inoculum, lignin, propionic acid
This study investigated the effect of anti-acidification microbial consortium (AAMC), which act synergistically for rapid bioconversion of organic acids on carbohydrate metabolism of key microbes in the course of food waste (FW) composting by metaproteomics. AAMC was inoculated to the composting mass and compared with treatment with alkaline compounds and the control without any amendment. Inoculating AAMC could effectively accelerate carbohydrate degradation process and improve composting efficiency. Carbohydrate metabolic network profiles showed the inoculation with AAMC could increase significantly the types of enzymes catalysing the degradation of lignin, cellulose and hemicellulose. Furthermore, AAMC inoculum could increase not only diversities of microbes producing key enzymes in metabolism pathways of acetic and propionic acids, but also the amounts of these key enzymes. The increase of diversities of microbes could disperse the pressure from acidic adversity on microorganisms which were capable to degrade acetic and propionic acids.