Research on Parameter Detection of Sludge Self Heating High-temperature Aerobic Digestion Process
The self heating high-temperature aerobic digestion technology of sludge is a sludge treatment method that achieves the resource utilization of sludge.This paper examined the changes in volatile organic compound indicators of sludge under different conditions of sludge concentration,stirring speed,aeration rate,and sludge retention time.The optimal process conditions were found:sludge solid content was 6%～7.5%(concentration of volatile organic compound was 44～56.5 g/L),stirring speed was 150 r/min,aeration rate was 0.2 m3/h,and sludge retention time was 6～8 d.The degradation rate of sludge volatile organic compound reached 50%～55%.The pathogenic bacteria in the digested sludge under optimal process conditions were also tested,and the results showed that the pathogenic bacteria in the digested sludge reached an undetected level.Mud can be used as A-grade biological solid for utilization.It provides reference for the resource utilization of sludge.
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