聚合氯化铝絮凝剂净水性能研究

Study on Water Purification Performance of Polyaluminum Chloride Flocculant

摘要: 聚合氯化铝絮凝剂是一种无机高分子混凝剂，由于氢氧根离子的架桥作用和多价阴离子的聚合作用而生产的分子量较大、电荷较高的无机高分子水处理药剂。通过考察聚合氯化铝絮凝剂添加量，沉降时间等因素，以浊度为主要考察指标，研究其对其净水效果的影响。实验表明，聚合氯化铝加量为5 g/100mL时絮凝效果最佳，适量的絮凝剂可以中和表面的电荷，使粒子之间的斥力降低，使絮凝聚集。沉降时间控制在1 h左右最佳，当沉降到达一定时间时，过量的絮凝会吸附于脱稳颗粒表面，产生“胶体保护”作用，引起颗粒重新稳定，从而导致浊度升高。

Abstract: Polyaluminum chloride flocculant is an inorganic polymer coagulant. Due to the bridging action of hydroxyl ion and the polymerization of polyvalent anions, inorganic polymers with larger molecular weight and higher charge are produced. By investigating the addition amount of polyaluminum chloride flocculant, settling time and other factors, THe turbidity was taken as the main index to study the influence on the water purification effect. The results showed that the flocculation effect was the best when the dosage of polyaluminum chloride was 5 g/100mL. An appropriate amount of flocculant can neutralize the surface charge, reduce the repulsion between particles, and flocculate aggregation. The best settlement time was about 1 h. When the settlement reaches a certain time, excessive flocculation will adsorb on the surface of the destabilized particles, producing a “colloid protection” effect, leading to the re-stability of the particles and the increase of turbidity.