摘要：Treatment and disposal of sewage sludge in the sewage treatment plants has been a difficult and hot spot. The present study investigated the dewatering of sewage sludge by using dimethyl ether (DME). Influences of extraction time and Liquefied DME/sludge ratio as well as the water mass change of sludge was studied. The result shows that it is applicable in the sewage sludge dewatering. The final water content of the dewatered sewage sludge could reach 60% and the dehydration rate was 62.5% when the extraction time was controlled at 80 minutes and liquefied DME/sludge ratio was 90mL/g. The DME dewatering reaction of the sewage sludge belongs to first-order reaction. DME was proved to be quite effective in the extraction of the free water; the weight loss rate of the sewage sludge reached 98.36% and its combustion effect was also ideal. Therefore the DME dewatering method is believed to have a great prospect in practical fuel use.
