Abstract
In order to industrialize sewage sludge composting process, matured compost (RC) was selected as a bulking agent to compost dewatered raw sludge(RS) from urban waste water plant in this paper. Aeration rate and ratio of sludge to matured compost was determined through experiments, operation parameters were evaluated by measurement of temperature, oxygen consumption rate (SOUR), organic matter. The results showed that (1) dewatered raw sludge can be mixed with matured compost into small particles when the ratio of sludge to matured compost lower than 1:1, and composting performed well when higher than 1:3; So RS:RC=l:2(v/v) was recommended for dewatered sludge composting. (2) the composting period was about 10 days, and the aeration rate 0.05m3/(m3 · min) was appropriate at the given ratio of 1:2; (3) matured compost was not only a cheaper bulking agent for composting, but also can accelerate composting as an inoculation agent.
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