Influence of the Coagulation Mechanism on the Coagulation Performances Using New Composite Coagulants: Role of the Raw Water Characteristics

被引：0

作者：

Qu J.-D. ^{[1
,2
]}

Xu H. ^{[2
]}

Xu J.-K. ^{[3
]}

Duan J.-M. ^{[1
]}

Men B. ^{[2
]}

Wang D.-S. ^{[2
]}

机构：

[1] School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an

[2] State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing

[3] Yantai Yongxu Environment Protection Co., Ltd., Yantai

来源：

Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 01期

关键词：

Ca[!sup]2+[!/sup; Coagulation; Composite coagulant; Floc characteristics; Residual aluminum;

D O I：

10.13227/j.hjkx.201802045

中图分类号：

学科分类号：

摘要：

To improve the coagulation performances, new composite coagulants were used to treat different water samples. The results indicate that Ca2+has no significant effects on the removal efficiency for turbidity in the kaolin system. The residual aluminum decreased from 0.15 mg•L-1 to 0.10 mg•L-1 (AlCl3was used as coagulant and the coagulant dosage was 0.10 mmol•L-1). The presence of Ca2+ led to the decrease of the amount of negative charges in the HA system and the residual aluminum decreased due to the decrease of the complexation between the HA molecules and Al-based coagulants. When the raw water contained BSA molecules and the coagulant dosage was 0.16 mmol•L-1, the flocs formed by PACl with Ca2+ were larger (~50 μm) than the flocs generated by PACl and the settleability also improved. Under alkaline conditions (pH=8.5), the DOC concentration decreased after coagulation process by ~0.2-0.6 mg•L-1 and the residual aluminum decreased by ~0.4-0.7 mg•L-1 using composite coagulants. Under acidic conditions (pH=5.5), the concentrations of DOC and residual aluminum did not significantly differ. © 2019, Science Press. All right reserved.

引用

页码：263 / 272

页数：9

共 25 条

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