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混凝-超滤工艺去除水中复合污染物试验研究
赵纯1,2,3, 金凡1,2,3, 安叶1,2,3, 孙志华4, 郑怀礼1,2,3
1.重庆大学 城市建设与环境工程学院;2.三峡库区生态环境教育部重点实验室;3.低碳绿色建筑国际联合研究中心, 重庆 400045;4.石河子大学 水利建筑工程学院, 新疆 石河子 832003
摘要:
研究分析腐殖酸对水溶液中纳米TiO2稳定性的影响,探究混凝剂投加量、pH值、钙离子对混凝-超滤工艺去除水中腐殖酸-纳米TiO2复合污染物的影响。结果表明,纳米TiO2与腐殖酸在水溶液中发生静电吸附以及配位反应,使纳米TiO2有效粒径减小,静电斥力增强,胶体分散更均匀,体系稳定性增加,易于迁移,从而给饮用水安全带来威胁。在单因素影响实验中,实验结果显示,混凝剂浓度为0.46 mmol/L、pH值在7~8之间(即弱碱性)时,能有效去除复合污染物,此时,膜通量较高,膜污染较轻,而水中钙离子的存在会加重膜污染。
关键词:  纳米二氧化钛  腐殖酸  混凝  超滤  膜污染
DOI:10.11835/j.issn.2096-6717.2019.082
分类号:X703.1
基金项目:中央高校基本科研业务(2018CDYJSY0055、106112014CDJZR210004);国家自然科学基金(21477010);大型仪器基金(201406150031)
Removal of compound pollutants in water by microflocculation-ultrafiltration process
Zhao Chun1,2,3, Jin Fan1,2,3, An Ye1,2,3, Sun Zhihua4, Zheng Huaili1,2,3
1.College of Urban Construction and Environment Engineering;2.Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education;3.National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, P. R. China;4.College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi 832003, Xinjiang, P. R. China
Abstract:
The effect of humic acid (HA) on the stability of nano-TiO2 was analyzed, and the effects of coagulant dosage, pH and calcium(Ⅱ) concentration on the removal efficiency of HA-TiO2 composite pollutants by the coagulation-ultrafiltration process were investigated. The results showed that the electrostatic adsorption and coordination reaction occurred between nano-TiO2 and HA in the aqueous solution, which caused the decrease of effective particle size of nano-TiO2, the enhancement of electrostatic repulsion, more uniform dispersion of colloid, the increase of system stability and easy migration. These posed a threat to the safety of drinking water. The optimum parameter for HA-TiO2 composite pollutants removal was that the coagulant concentration is 0.46 mmol/L, and the initial pH value is between 7 and 8,the higher membrane flux and lighter membrane fouling was achieved under this condition. The calcium ion in the solution will lead to the increase of membrane fouling.
Key words:  nano-titanium dioxide  humic acid  coagulation  ultrafiltration  membrane fouling
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