Influence of composite flocculant FeCl3-APAM on vacuum drainage of river-dredged sludge
Influence of composite flocculant FeCl3-APAM on vacuum drainage of river-dredged sludge
复制标题
复合絮凝剂FeCl3-APAM对河道疏浚污泥真空排水的影响
DOI：
10.1139/cgj-2018-0268
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发表时间：
2019
影响因子：
3.6
通讯作者：
Xiaoxiao Zhu
中科院分区：
文献类型：
--
作者：
Jun Wang;Wenjie Shi;Wenqing Wu;Feiyu Liu;Hongtao Fu;Yuanqiang Cai;Jun Hai;Xiuqing Hu;Xiaoxiao Zhu
污泥是河道疏浚的必然产物，具有高含水量、高流动性和高重金属含量的特点。处理这一问题需要考虑经济和环境影响。采用阴离子聚丙烯酰胺（APAM）与FeCl 3复合絮凝剂结合真空预压处理疏浚污泥的室内试验。监测参数包括排水速率和污泥沉降，以及测试后的含水量和抗剪强度。复合絮凝剂的投加有效地增强了土壤的絮凝作用，增大了土壤粒径，加快了排水速度，从而提高了处理效果和对所含重金属的固化。结果表明，当APAM与FeCl 3的质量比为1：5时，污泥含水率由140%降至50%，重金属的固化率超过88%。
Sludge is an inevitable product of river dredging and is characterized by a high water content, high fluidity, and high heavy metal content. Its treatment requires consideration of the economic and environmental implications. In this study, a composite flocculant comprising anionic polyacrylamide (APAM) and FeCl3was used in combination with vacuum preloading to conduct indoor tests on the treatment of dredged sludge. The monitored parameters included the water drainage rate and sludge settlement, and the water content and shear strength after testing. The addition of the composite flocculant was found to effectively enhance the flocculation of the soil and increase the soil particle size, resulting in accelerated water drainage, thus improving the treatment effect and the solidification of the contained heavy metals. The treatment was found to be optimized by an APAM:FeCl3ratio of 1:5 in the composite flocculant, under which the moisture content of the sludge was reduced from 140% to 50%, and the solidification rate of the heavy metals exceeded 88%.