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分别采用自制的芳香聚酰胺平板纳滤膜和某芳香聚酰胺平板纳滤膜商品处理模拟含铬饮用水,考察其处理效果及影响因素。结果表明:在Cr(Ⅵ)浓度为50～250μg/L、pH值为7左右、操作压力为0.5 MPa、温度为25℃的条件下,两种纳滤膜对Cr(Ⅵ)的截留效果均较好,出水Cr(Ⅵ)浓度均低于0.05 mg/L(GB 5749—2006的限值),且截留率均随Cr(Ⅵ)浓度的升高而下降,膜通量则基本不变;随着操作压力的增加,两种纳滤膜对Cr(Ⅵ)的截留率均呈上升趋势,膜通量也大幅增加;进水pH值越高,则纳滤膜对Cr(Ⅵ)的截留效果越好,但膜通量无明显变化。
The aromatic polyamide plate nanofiltration membrane and aromatic polyamide plate nanofiltration membrane were respectively used to simulate chromium-containing drinking water, and the treatment effect and influencing factors were investigated. The results showed that the retention of Cr (Ⅵ) by two nanofiltration membranes were both at Cr (Ⅵ) concentration of 50 ~ 250 μg / L, pH value of 7, operating pressure of 0.5 MPa and temperature of 25 ℃ The effluent Cr (Ⅵ) concentration was lower than 0.05 mg / L (the limit of GB 5749-2006), and the rejection rate decreased with the increase of Cr (Ⅵ) concentration, while the membrane flux remained almost unchanged. With the increase of operating pressure, the rejection of Cr (Ⅵ) by both nanofiltration membranes all showed an upward trend and membrane flux increased significantly. The higher the pH of the influent was, the higher the retention of Cr (Ⅵ) The better the effect, but no significant change in membrane flux.