Abstract
The fundamentals of lime treatment for dewatered sludge and main factors which affect the treatment process are introduced in this study. According to the results, higher effective calcium oxide content in lime contributes to faster heating rate of the semi-dry system and better effects of semi-dry process. Sludge at the moisture content of 45%-55% after the semi-dry process can be well balled while that at the moisture content of 35% can easily get collapsed and has hard surface. Mechanical design parameters are determined by experiments. The optimum stirring time is 5-10mins when well stirred and the stirring rate should be slow. Heat preservation jacket is needed for the machine and the water vapor, which is produced by heating, should be exhausted in time.
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