纳滤膜处理炼油厂循环冷却水排水

采用高效混凝沉降—超滤工艺对循环冷却水排水进行预处理后,考察了NF-A、NF-B和NF-C型纳滤膜的运行情况和处理效果.实验结果表明:NF-A膜对COD、Ca2+和Mg2+的去除率均较低,对Clˉ没有去除效果;NF-C膜对COD、Ca2+、Mg2+和SO42-的去除率均较高,对Clˉ去除率为83.1％,但运行压力较高;NF-B膜运行压力居中,对COD去除率为95.9％,对Ca2+去除率为98.3％,对Mg2+去除率为93.4％,对SO42-去除率为98.2％,对Clˉ去除率为67.4％,处理后出水达到循环回用的要求.

Treatment of Effluent Circulation Cooling Water in Refinery Using Nanofitration(NF) Membrane

Effluent circulation cooling water was pretreated by the process of efficient coagulation and sedimentation-ultrafiltration.The running conditions and treatment effects of NF-A,NF-B and NF-C were studied.The experimental results show that:For NF-A,the removal rates of COD,Ca2+ and Mg2+ are lower and it has no effect on the removal of Cl-;For NF-C,the removal rates of COD,Ca2+,Mg2+ and SO42-are higher and the Cl-removal rate is 83.1%,but the running pressure is too high;For NF-B,the running pressure is suitable and the removal rates of COD,Ca2+,Mg2+,SO42-,Cl-are 95.9%,98.3%,93.4%,98.2%,67.4% respectively.The treated water can meet the requirements of reuse.