Research on the effect of hyperthermophilic bacteria on the reduction of fermentation process of rural organic solid waste
Traditional fermentation,as a waste resource treatment technology,has been widely used,but it has shortcomings such as long fermentation cycle,low fermentation temperature,large capacity,high moisture content and low reduction effect.This article used ultra-high temperature aerobic fermentation technology to treat rural organic solid waste.The thermophilic bacterial community with Bacillus as the core cultured in ultra-high temperature environment was added to the organic solid waste.High throughput sequencing technology was used to analyze the microbial population at different stages of the pile.At the same time,the temperature,moisture content,carbon nitrogen ratio(C/N,mass ratio),pH,seed germination index(GI)and electrical conductivity(EC)were also analyzed.The results showed that the highest temperature of the pile was 86 ℃.The proportion of the ultra-high temperature fermentation period reached 2/3,with 80 ℃ as the node,and the moisture content decreased from 44.57％to 29.09％.The total weight loss rate and total volume reduction rate were 85.50％and 50.51％,respectively.At the end of fermentation,the C/N and pH were 15.56 and 7.55,respectively.The GI and EC of the material at the end of fermentation were 110.24％and 3.72 mS/cm,respectively.During the fermentation process,Bacillales and Actinomycetales were the main bacteria genus that achieved the effect of reducing pile size.In summary,thermophilic bacteria had a certain promoting effect on aerobic composting and were ideal fermentation agents for reducing rural solid waste.
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