微波预处理对制革污泥絮凝脱水性能的影响  

Influence of microwave pretreatment on tannery sludge flocculating and dewatering performances

作　　者：罗海健[1] 付长亮[2] 宁寻安[1] 刘敬勇[1] 梁秀娟[1] 

机构地区：[1]广东工业大学环境科学与工程学院,广州510006 [2]河南化工职业学院,郑州450042

出　　处：《环境工程学报》2013年第5期1933-1938,共6页Chinese Journal of Environmental Engineering

基　　金：广东省部产学研结合项目(2011B090400161);广东省高校优秀青年创新人才培养项目(LYM11059)

摘　　要：分别采用微波、絮凝剂和微波联合絮凝剂对制革污泥进行脱水预处理,考察不同处理条件下制革污泥沉降速率(SV30)、毛细吸水时间(CST)和污泥比阻(SRF)的变化,并通过粘度、水分分布和微观结构的变化探讨相关的脱水机理。结果表明,在微波输出功率为648 W、辐射时间为60 s的预处理条件下,阳离子聚丙烯酰胺(CPAM)投加剂量为8 mg/L时,污泥脱水性能达到最佳。与单独添加絮凝剂的污泥脱水相比,该条件下的SV30、CST和SRF分别降低了25.0%、48.9%和34.7%。污泥絮凝脱水前进行微波预处理能够进一步提高污泥的脱水性能,微波辐射联合CPAM进行污泥脱水时,CPAM则起主要脱水作用。微波辐射通过破坏污泥絮体结构,改变污泥中的水分分布,降低污泥的粘度,从而提高污泥的脱水性能。The settling velocity （SV30）, capillary suction time （CST）and specific resistance to filtration （SRF） were investigated on the tannery sludge pretreatment by microwave, flocculant and microwave with floccu-lant co-conditioning respectively. The viscosity, water distribution and microscopic structure were also analyzed to evaluate the pretreatment efficiency and dehydration mechanism. The results showed that the optimal pretreat-merit conditions were microwave output power of 648 W, radiation pretreatment time of 60 s and cationic polyac-rylamide （CPAM）dosage was 8 mg/L. Comparing with the separate flocculant pretreatment, it was observed that the SV30, CST, SRF decreased 25% , 48.9% and 34.7% , respectively under the optimal conditions. It was al-so indicated that the dewatering performance was improved highly with the pretreatment of microwave and floccu-lant co-conditioning, while CPAM had played an important role in sludge dewatering. Microwave radiation de-stroyed the floc structure of the sludge, which changed the water distribution and reduced the viscosity of the sludge, thus improved the dewatering performance of the tannery sludge.

关 键 词：制革污泥 微波 絮凝 脱水性能 水分分布 

分 类 号：X705[环境科学与工程—环境工程]