微波热解污泥影响因素及固体残留物成分分析

Influencing factors of sewage sludge pyrolysis by microwave and sewage sludge pyrolysis residues analysis

为探究不同热解条件下污泥微波热解的特性,考察了微波功率、污泥含水率以及吸波物质添加量对污泥热解过程及固体残留物的影响,利用响应曲面法优化了污泥微波热解的条件并分析了污泥热解固体残留物的成分.结果表明:当微波功率为1 880 W、污泥含水率为79.7%、吸波物质添加量为0.48 g时,响应曲面法预测最高污泥热解效率为77.4%,实际测得污泥的热解效率为77.5%.污泥热解固体残留物中灰分和固定碳比例较大,主要无机成分为Si O2、Al2O3、Fe2O3、Ca O等氧化物,适宜进一步材料化利用.

In order to investigate the microwave pyrolysis characteristics of sewage sludge under different pyrolysis cgnditions, effect of microwave power, sewage sludge moisture content and microwave absorbing material content on the sewage sludge pyrolysis process and the pyrolysis residues was investigated. The microwave pyrolysis conditions of sewage sludge were optimized using response surface methodology and the components of pyrolysis residue were analyzed. The predicted highest pyrolysis efficiency of sewage sludge obtained from the response surface methodology was 77.4% when microwave power was 1 880 W, sludge moisture content was 79.7% and microwave absorbing materials content was 0.48 g. For comparison, the actual measurement one was 77.5%.Ash and fixed carbon accounted for a large proportion of the pyrolysis residues and the major inorganic components were SiO2, Al203, Fe203 and CaO, etc.