基于微波辐射研究城市污水污泥脱水特性

Microwave Radiation Research on Dewater Characteristics of Municipal Sewage Sludge

选用沈阳市仙女河污水处理厂和北部污水处理厂污水污泥作为微波脱水试验物料,分析物料性质、辐射强度、辐射时间以及添加剂投入量等对污泥脱水率和有机质损失率的影响.结果表明：污泥中水分含量高的脱水效果最好,经过微波处理后的污泥有机质含量仍较高;辐射时间是最主要的影响因素,在540 W下辐射2~5 min即可达到良好效果;在合适的辐射时间下540~900 W都能达到良好的脱水效果,但在900 W时有机质的损失率较大,达到65.64%;添加剂投入量对污泥脱水基本不起作用,但可改变污泥微波干燥后的性状.同时,运用灰色关联分析得到决定微波试验运行系统的主次因素,最后建立了影响因素对污泥脱水率和有机质损失率的经验公式.

This thesis focuses on microwave treatment dehydration experiments on sewage sludge sampled from the Xiannu River waste water treatment plant and northern waste water treatment plant. The thesis analyzes the material property, radiation intensity and duration, and also the influential elements on the rate of additive dehydration. It was found that the percentage of sewage in the sludge was the most influential factor for dehydration, and the percentage of organisms was still very high after the microwave treatment. Radiation was the most important factor of all, and the result of dewatering was good at 2-5 min radiation time even at 540 W. Suitable dewatering results were reached using 540-900 W radiation. The greatest loss of organisms occurred at 900 W, with loss reaching 65.64%. The additives did not have positive effects on the dehydration of sludge. However, they could change the properties of the sludge after dehydration. At the same time, the grey relative analysis method was employed to calculate the relative degree to identify the primary and secondary elements that impacted the microwave experimental system. Finally, the empirical formula for dehydration rate and the loss of organism was obtained through the stepwise regression analysis method.