利用硅藻土与PAM进行污泥絮凝沉淀的实验研究

Study on the Flocculate Effect of Excess Sludge by Diatomite and PAM

为了选择高效絮凝剂,提高污泥的脱水效率,采用正交实验和单因素实验,对武汉某污水处理厂剩余污泥进行絮凝沉降实验,进一步验证了硅藻土和PAM两种絮凝剂的投加量有一个最佳值,大于或小于这个值都会降低絮凝效果;PAM与硅藻土均以湿法投加效果为好,且PAM最好熟化2h,硅藻土浸泡1h;通过PAM与硅藻土的配伍使用实验,最后找到硅藻土占干污泥的0.83%和PAM占干污泥的0.17%的量配合使用时,污泥沉降效果大大强于单独使用一种絮凝剂,而且费用经济。

To select a high effective flocculants, improving the dewatering efficiency, using orthogonal test and single factor test, through the flocculation experience to the excess sludge ofa wastewater treatment plant in Wuhan, we further proved that the two flocculation ofdiatomite and PAM had their best value, more than or less than this dosage would be a bad effect. Both PAM and diatomite are good result by added in wet way, and the mature time of PAM less than 2 hours, diatomite need less than 1 hour. Though the combined use of PAM and diatomite experience, the best results show that PAM of dry sludge is 0.17% and diatomite of dry sludge is 0.83%, which not only enhancing the sedimentation effect but also the cost are further better than using one flocculation only.