典型南方源水的有机高分子助凝研究

Effect of Organic Polymeric Coagulation Aid on Typical Source Water in Southern China

对我国南方某典型源水的有机高分子助凝效果进行了研究,分别进行了烧杯试验和中试验证。结果表明:阳离子型PAM是较适合当地水质情况的助凝剂,其投量应选在0.03～0.10mg/L,助凝效果最显著地体现在聚合氯化铝(PAC)投量≤2.0mg/L阶段;投加时间点应在PAC投加1min后;搅拌强度为100～300r/min;PAM溶液(浓度为0.1%～0.4%)放置二周其助凝效果也不会发生明显变化。在沉速试验中发现,助凝剂在不同投药时间点(如同时投药或1min后投药)的絮体形成和沉速差别明显,但在沉后静置20min后余浊差别甚微,这将导致不同设施在实施助凝处理时的效果不同。

Effect of organic polymeric coagulation aid on typical source water in the South China was studied, and it was verified both by jar-test and pilot test. The result shows that the cationic PAM is the coagulation aid more suitable to the local source water, with the dosage at 0.03-0.10 mg/L. The polyaluminum chloride (PAC) with dosage of ≤2 mg/L has the most remarkable aid effect. The dosing point is selected at about 1 min after PAC dosing, and the mixing intensity is 100-300 r/min. PAM solution with concentration of 0.1%-0.4% sees no great variation in aid effect after storage for two weeks. It is found from the settling test that there is distinct difference in floc formation and settling velocity at different dosing point (such as the same dosing point as PAC or 1 min after PAC dosing), but little variation of residual turbidity is detected after 20 min settling, and thus resulting in the different effect when the coagulation aid is used for different facilities.