Study on the Aerobic Composting Test of Sewage Sludge

[Objective] The research was to study the feasibility of agricultural utilization of treating the excess sludge by sewage in city.[Method] With self-designed aerobic composting device,the excess sludge from a sewage treatment plant was mixed with rice straw according to different volume ratio of 1∶1,1∶2,1∶3 and 1∶4 for making compost,the parameters of temperature,moisture content and K content etc.in compost boxes were observed in composting process,and the maturity of compost was evaluated.[Result] When the compost was made according to the volume ratio of sludge and rice straw was 1∶2,the temperature in compost boxes was increased rapidly,and the moisture content was decreased greatly,organic matter content was decreased rapidly,K content was higher,the increment of Cu was the least,the decrement of Zn was most obvious, and the maturity of compost was better,all indexes were accord with the requirements of maturity,which could realize the resource,harmless and stabilization of sewage.[Conclusion]Treating the excess sludge by sewage in city had agricultural utilization,and the compost effect was better when the volume ratio of sludge and rice straw was 1∶2.