不同絮凝剂对工程废弃泥浆絮凝脱水性能影响试验研究

Experimental Study on Effect of Different Flocculants on Flocculation and Dewatering Performance of Engineering Waste Mud

为研究城建工程废弃泥浆泥水分离性能,提高泥浆处理效率,通过化学絮凝的方法对城建工程中产生的废弃泥浆的泥水分离性能进行试验研究,对比分析了不同絮凝剂对泥浆的絮凝沉降效果及絮凝机理。结果表明:与无机絮凝剂相比,有机絮凝剂能够实现较快的泥水分离,但随着絮凝时间的增加,两类药剂处理后泥浆含水率趋于相同,在7 h时,含水率差异较小;阳离子型聚丙烯酰胺(分子量1200万)与聚合氯化铝效果较好,最佳添加量分别为0.2%和0.8%;有机高分子絮凝剂的吸附架桥和网捕-卷扫作用能够使泥浆生成粒径更大团粒;结合成本分析,现场选用聚合氯化铝对泥浆进行处理,具有良好经济效益。

In order to study the sludge water separation performance of urban construction engineering waste mud and improve the mud treatment efficiency,the sludge water separation performance of the waste mud produced in urban construction engineering was studied by chemical flocculation method,and the flocculation sedimentation effect and flocculation mechanism of different flocculants on the mud were compared and analyzed.The results showed that compared with inorganic flocculants,organic flocculants can achieve faster mud water separation,but with the increase of flocculation time,the water content of the two kinds of agents tends to be the same,and the difference of water content is small at 7 h;Cationic polyacrylamide(molecular weight of12 million)and polyaluminum chloride have better effect,and the optimal addition amount is 0.2%and 0.8%,respectively;The adsorption bridging and net catching sweeping of organic polymer flocculant can make the mud produce larger particles;Combined with cost analysis,polyaluminum chloride is selected to treat the mud on site,which has good economic benefits.