PAC与PDMDAAC复合混凝剂去除高浊度水中有机氯

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摘要

以聚合氯化铝(PAC)和聚二甲基二烯丙基氯化铵(PDMDAAC)为原料制备复合混凝剂,采用强化混凝的处理方法,对高浊度水体中有机氯(OCPs)以及浊度去除效果进行研究.考察了PAC-PDMDAAC复合比例、复合混凝剂投加量、水样初始浊度、慢速搅拌时间、pH值等因素对浊度和OCPs去除效果的影响,结合絮体分形维数和Zeta电位对去除效果进行验证.结果表明,复合比例对处理高浊水体中的OCPs以及浊度效果影响较大,PAC与PDMDAAC复合比例为5:1,投药量为1mL/L,慢速搅拌时间为15min时,OCPs和浊度去除率达到最佳;随着初始浊度的升高,水体中OCPs的去除率也随之增加,表明PAC-PDMDAAC复合混凝剂更适用于高浊度水中OCPs和浊度的去除;复合混凝剂与其他混凝剂相比,其最佳pH值范围较广,当pH值为4时,OCPs和浊度去除率达到最佳.利用絮体分形维数和Zeta电位两种表征手段对混凝效果进行进一步探讨,说明了实验结果的正确性.

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	贺建栋
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关键词 ：高浊水体, OCPs, 强化混凝, PAC-PDMDAAC

Abstract：

The elimination of turbidity and organochlorine (OCPs) in high-turbidity water by enhanced coagulation was studied. A composite coagulant was prepared by Poly Aluminium Chloride (PAC) and Poly Dimethyl Diallyl Propy Ammoniuml Chloride (PDMDAAC). The effect of PAC-PDMDAAC composite ratio, dosage of the composite coagulant, initial turbidity, the time for slow stirring and pH on the elimination efficiencies of turbidity and OCPs were tested and characterized by fractal dimension of flocs and Zeta potentials to verify the result. The results show that PAC-PDMDAAC ratio has great influence on the removal effect of OCPs and turbidity. The removal rates of turbidity and OCPs reach the highest values when the PAC-PDMDAAC composite ratio is 5:1, the dosage of PAC-PDMDAAC is 1ml/L, and the time for slow stirring is 15min. With the increase of initial turbidity, the removal rate of OCPs in the water is also increased which shows that the PAC-PDMDAAC apply to high turbidity water. Compared with other coagulants, The PAC-PDMDAAC composite coagulant has wide pH range suitable for use, the removal rates of turbidity and OCPs reach the best when the pH is 4. The coagulation effects are well verified and explained by measuring the fractal dimension of flocs and Zeta potential of particles.

Key words： high turbidity water OCPs enhanced coagulation PAC-PDMDAAC composite coagulant

收稿日期: 2015-11-15

PACS:

X703.5

基金资助:

国家自然科学基金(21277065);教育部长江学者和创新团队(IRT0966)

通讯作者: 常青 E-mail: changq47@163.com

作者简介: 贺建栋(1991-),男,甘肃定西人,兰州交通大学硕士研究生,主要从事水污染控制研究.

引用本文:

贺建栋, 刘鹏宇, 常青, 张翠玲. PAC与PDMDAAC复合混凝剂去除高浊度水中有机氯[J]. 中国环境科学, 2016, 36(6): 1738-1745. HE Jian-dong, LIU Peng-yu, CHANG Qing, ZHANG Cui-ling. Efficiency of the PAC-PDMDAAC composite coagulant for eliminating the organochlorines in high-turbidity water. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(6): 1738-1745.

链接本文:

http://manu36.magtech.com.cn/Jweb_zghjkx/CN/ 或 http://manu36.magtech.com.cn/Jweb_zghjkx/CN/Y2016/V36/I6/1738

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