固化剂使用量对淤泥脱水效果的影响

Impact of Amount of Solidifying Agent on Dewatering Effect of Sludge

为研究固化剂的使用量对淤泥脱水效果的影响,以武汉南太子湖清淤时所取的淤泥为基础,对采用"聚丙烯酰胺(PAM)+铁盐"方式进行淤泥脱水固化时,不同的淤泥含固率、PAM和铁盐的使用量对淤泥脱水固化效果的影响进行了试验研究。结果显示:加入固化剂后,当淤泥的含固率低于20%时,脱水效果明显;当淤泥的含固率超过35%时,淤泥很难发生明显的絮凝反应;当PAM使用量一定,铁盐使用量不超过210 mg/L时,泥水分离速度随铁盐使用量的增加而加快;铁盐使用量超过210 mg/L后,继续增加铁盐使用量,泥水分离速度没有明显增加,且上清液逐渐变成红色;当铁盐使用量一定,PAM使用量不超过210 mg/L时,泥水分离速度随PAM使用量的增加而加快;PAM使用量超过210 mg/L后,继续增加PAM使用量,泥水分离速度没有明显增加。

In order to study the impact of the amount of solidifying agent on the dewatering effect of sludge,based on the sludge taken from the dredging of Nantaizi Lake in Wuhan,the impacts of different sludge solid contents,the usage amount of PAM and iron salt used on the dewatering and solidification effect of the sludge are experimentally studied.The results show that after adding the solidifying agent,when the sludge solid content is less than 20%,the dewatering effect is obvious;when the sludge solid content exceeds 35%,the sludge is difficult to have evident flocculation reaction;when the usage amount of PAM is certain and the usage of iron salt does not exceed 210 mg/L,the separation speed of the slurry accelerates with the increase of the usage amount of iron salt;after the usage of iron salt exceeds 210 mg/L,and the usage amount of iron salt continue to increase,but the separation rate of mud-water does not increase significantly,and the supernatant gradually turns red;as the usage amount of iron salt is fixed and the amount of PAM does not exceed 210 mg/L,the rate of mud-water separation accelerates with the increase of usage amount of PAM;after the usage amount of PAM exceeds 210 mg/L and continues to increase the usage amount of PAM,but the rate of mudwater separation does not increase significantly.