摘要：

针对浊度为2~4 NTU的原水,以氯化铁为絮凝剂确定了絮凝反应的最佳pH和氯化铁最佳投加量,并比较了高岭土、硅藻土和聚丙烯酰胺(PAM)的助凝效果。研究结果表明:pH在8.0时有较好的絮凝效果,氯化铁最佳投加量为3.2~3.8 mg/L;高岭土最佳投加范围3~4 mg/L,浊度去除率可达75.1%;硅藻土最佳投加量为2 mg/L,浊度去除率可达75.7%;PAM最佳投加量为0.2 mg/L,浊度去除率可达87.1%。采用PAM助凝效果最好,可有效提高混凝沉淀效果。

关键词: 低浊度, 氯化铁, 絮凝

Abstract:

Aiming at the raw water whose turbidity is 2-4 NTU,ferric chloride(FeCl₃) has been used as flocculant, so as to determine the optimum pH and optimum dosage of FeCl₃ in the flocculation reaction. The effects of flocculant aids,including kaolin clay,diatomite and polyacrylamide(PAM),are further compared. The research results indicate that the flocculation effect is better when the pH is 8.0 and optimum dosage range of FeCl₃ is between 3.2 and 3.8 mg/L. And the optimum dosages of kaolin clay,diatomite and PAM are 3-4 mg/L,2 mg/L and 0.2 mg/L,respectively. Their corresponding turbidity removing rates can reach 75.1%,75.7% and 87.1%,respectively. Using PAM has the best flocculation aid effect,being able to improve coagulation and sedimentation effects,too.

Key words: low turbidity, ferric chloride, flocculation

中图分类号: 

• X703