改性蛭石无机矿物絮凝剂的性能研究

The Performance of Modified Vermiculite Flocculant

以无机矿物材料蛭石为原料,通过酸改性制备蛭石絮凝剂,用此絮凝剂处理模拟废水、校园湖水以及食品厂生化废水,并与聚合氯化铝(PAC)絮凝剂的絮凝效果进行对比.由实验结果可知:酸改性的蛭石絮凝剂与PAC絮凝剂具有几乎相同的絮凝效果,浊度去除率可达98%,以上,而在絮体的沉降性能上远优于PAC;蛭石絮凝剂中的可溶性盐和颗粒物因其电中和及范德华引力的协同效应,显示出较好的沉降性能和压缩性能,絮体达到沉降平衡后,其体积只有PAC的1/3;蛭石絮凝剂与PAC絮凝剂复配,可有效地减少絮体体积,提高絮体沉降性能.

Inorganic mineral vermiculite was used as raw material for preparing flocculant via acid modification and its flocculation properity was investigated in treating simulated wastewater,campus lake water and food biochemical wastewater.Poly aluminium chloride(PAC)was used for comparison.The experimental results show that the modified vermiculite’s flocculation performance is similar to PAC’s.Modified vermiculite could reach more than 98%,turbidity removal and is better than PAC in terms of flocs’sedimentation properties.Due to the synergistic effect of charge neutralization and van der Waals force of the modified vermiculite’s soluble salts and insoluble particles with suspensions in wastewater,the modified vermiculite shows a better sedimentation performance and compressive properties,i.e.,the volume of equilibriumed flocs is only one-third of PAC’s.The compound of the modified vermiculite and PAC could effectively reduce the volume of the flocs and improve the flocs’sedimentation performance.