Research Progress in Preparation of Carbon Source by Chemical Pretreatment of Excess Sludge
Waste activated sludge(WAS)is an inevitable product of the operation of municipal sewage treatment plant,and its output is increasing year by year.WAS contains a large number of unstable organic matter,and the utilization of such organic matter will undoubtedly bring practical significance to the reduction and disposal of sludge.Short-chain fatty acids(SCFAs)produced by WAS anaerobic fermentation have been recognized as high quality carbon sources,but sludge hydrolysis is a rate-limiting step of anaerobic fermentation,which needs to be promoted by pretreatment methods to improve the yield of SCFAs.In this paper,the research progress of acid base pretreatment,oxidizer pretreatment and combined pretreatment in chemical pretreatment of residual sludge was reviewed,providing technical guidance for the future process using residual sludge hydrolysate as carbon source.
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