试验考核在线混凝超滤工艺预处理天津渤海湾海水的可行性,采用外压式中空纤维超滤膜,研究膜的最大膜通量,以及通过数据和理论公式分析得到该工艺的最佳化学强化清洗方式.试验分3阶段进行,每阶段采用不同膜通量和化学强化清洗方式.3个月试验结果表明:在跨膜压差≤75 kPa时能保证系统稳定运行的最大膜通量为54.2 L/(m2·h);最佳化学强化清洗方式为:气水擦洗,pH=2的H2SO4和质量分数120×10-6的NaClO相继连续清洗,气水擦洗,质量分数0.15×10-6亚硫酸氢纳浸泡,气水擦洗,清洗频率为1次/d;同时清洗效果表明,H2SO4和NaClO清洗对膜污染控制有不同的作用,H2SO4清洗有利于去除该工艺的不可逆污染物,NaClO清洗有利于减缓膜污染;试验产水满足反渗透进水要求,产水中未监测到藻类,产水浊度在0.06～0.1 NTU之间,SDI15<3,CODMn去除率为26%～45%.
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