混凝-超滤短流程工艺膜污染特性及防治研究

发布时间：2018-04-28 22:34

本文选题：膜污染 + 跨膜压差　；参考：《水处理技术》2017年03期

【摘要】：针对混凝-超滤短流程工艺在特大洪水发生后出现的超滤膜堵塞问题,采用强化混凝、预氧化以及高效膜清洗等工艺,以跨膜压差TMP和膜比通量SF等为参数,研究控制膜污染的优化运行条件。结果表明,优化工艺条件为:混凝剂聚合氯化铝的投加量为7 mg/L,混凝时间为15 min;预氧化剂选用质量浓度1.5 mg/L的次氯酸钠;物理清洗周期为30 min;维护性化学清洗采用质量浓度400 mg/L的次氯酸钠溶液,清洗时间设为80 min;离线性化学清洗分为碱洗(氢氧化钠)和酸洗(盐酸)。该工艺可有效缓解混凝-超滤短流程运行过程中膜污染的情况,可为水厂工艺提标改造提供技术指导。
[Abstract]:In order to solve the problem of membrane blockage in the process of coagulation-ultrafiltration short process after the catastrophic flood, enhanced coagulation, preoxidation and high efficiency membrane cleaning were adopted. The transmembrane pressure difference (TMP) and membrane specific flux (SF) were taken as parameters. The optimal operating conditions for controlling membrane fouling were studied. The results show that the optimum technological conditions are as follows: the dosage of coagulant polyaluminium chloride is 7 mg / L, the coagulation time is 15 minutes, the pre-oxidant is sodium hypochlorite with a mass concentration of 1.5 mg/L. The physical cleaning period was 30 minutes, the maintenance chemical cleaning was sodium hypochlorite solution with a mass concentration of 400 mg/L, the cleaning time was set at 80 minutes, and the separation chemical cleaning was divided into alkali washing (sodium hydroxide) and acid washing (hydrochloric acid). This process can effectively alleviate membrane fouling during the operation of coagulation-ultrafiltration process and provide technical guidance for the upgrading of water plant process.
【作者单位】：沈阳建筑大学市政与环境工程学院;
【基金】：国家自然科学基金(51508342) 辽宁省自然科学基金(201602607) 住建部科研项目(2015-k7-019) 辽宁省高校优秀人才计划(LJQ2015090)
【分类号】：TQ051.893

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