不同操作条件对纳滤膜去除水中五价砷的研究

摘要

Experiments using synthetic water containing arsenic were conducted to study on effect of different operation parameters such as feeding concentration, pH, temperature, pressure and natural organic concentration in water on pentavalent arsenic removal with nanofiltration (NF) membranes.The results showed that NF removed As( V ) with high rate up to 99％.In the initial 2.5 hours the removal rate was higher than 90％, and then drops with time.Different operation parameters affected the removal rate of arsenic significantly.%采用纳滤膜(NF90)过滤自配含砷水,研究在不同操作条件下纳滤膜对水中砷去除效果的影响.本实验探讨膜进水浓度、水的pH值、膜进水温度、操作压力、水中天然有机物浓度等对膜除砷效率的影响.结果表明:纳滤膜对水中五价砷(As(Ⅴ))的去除率很高,最高去除率能达到99%,在实验的前2.5个小时内,砷的去除率均在90%以上.但是,纳滤膜除砷效率随着时间变化,去除率会降低.不同的操作条件对纳滤膜除砷的影响很大,研究不同条件的影响对应用很有意义.