混凝-超滤工艺去除水中复合污染物试验研究
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X703.1

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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
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    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。

    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.

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赵纯,金凡,安叶,孙志华,郑怀礼.混凝-超滤工艺去除水中复合污染物试验研究[J].土木与环境工程学报(中英文),2019,41(4):143-149.

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  • 收稿日期:2018-09-30
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  • 在线发布日期: 2019-07-27
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