市政污泥深度脱水药剂优化研究简

污泥含水率高影响污泥后续处置。利用化学药剂对污泥进行深度脱水处理可使污泥减量化、稳定化。为提高深度脱水效果，对添加剂进行了种类和添加量的优化研究（石灰、工业石灰、粉煤灰、硅藻土、十二烷基磺酸钠和飞灰；5%、10%、15%、20%、25%和30%），另外，还进行了复合投加实验。研究结果表明，石灰、工业石灰、粉煤灰的深度脱水效果最好；复合添加中，25%石灰+5%粉煤灰，20%石灰+10%粉煤灰，10%石灰+20%粉煤灰的深度脱水效果最好。5%的石灰或者工业石灰的添加剂量使干化污泥pH值达到12.25，粉煤灰、硅藻土、十二烷基磺酸钠和飞灰的添加对干化污泥pH值影响相对要小。

Study on optimizing deep-dewatering reagent for sewage sludge

High water content in sewage sludge will have adverse effects on the following treatment process. Deep-dewatering process of sewage sludge with the use of chemical reagents can both reduce the amount of sewage and stabilize it as well. In order to improve the efficiency of deep-dewatering technology, we studied six kinds of reagents (lime, industry lime, coal ash, diatomite, SDS, fly ash)and their corresponding additive doses (5%, 10%, 15%, 20%, 25%, 30%). At the same time, composite additive experiment was also conducted in the research. The study showed that lime, industry lime and coal ash performed better in deeply dewatering sludge. And in the composite additive experiment, the combination of 25% of lime+5% of coal ash, 20% of lime + 10% of coal ash and 10% of lime + 20% of coal ash produced better results than others. An addition of 5% of lime or 5% of industry lime could raise the pH values of dried sludge to 12.25 while an addition of coal ash, diatomite, sodium dodecyl sulfate (SDS) and fly ash had less effects on pH values.