摘要：

采用反应与分离相耦合的途径,用19通道陶瓷膜元件构建了5L气升式膜反应器,并就其用于钢铁酸洗液的处理进行了研究。结果表明:在0.5～2.5m³/h曝气量范围内,稳定膜通量能维持在60L/(m²·h)以上,且提高曝气量有利于提高循环液体流速。在稳定操作条件下,料液中氢氧化铁悬浮物浓度、温度(1～45℃)和膜两侧压差(0.025～0.1MPa)均与膜通量呈线性关系。当处理Fe²⁺质量浓度为400mg/L的酸洗废液时,在溶氧度>70%、压差0.1MPa、18～25℃、pH为6～9、HRT=2h条件下,出水浊度2NTU,pH符合国家排放标准。

关键词: 多通道膜元件, 气升式反应器, 废水处理, 膜分离

Abstract:

Steel pickling waste has been treated by using a 5 L airlift membrane reactor which couples with a 19- channel porcelain membrane element.The results show that when the aeration volume is in the range of 0.5-2.5 m3/h， membrane flux can be maintained above 60 L/（m2·h）.In addition,increasing the aeration amount is good for increasing the circulating liquid flux.Under stable operating conditions,the suspended solids concentration of ferric hydroxide in liquid,temperature（1-45 ℃） and operation pressure（0.025-0.1 MPa） show a linear relationship with membrane flux.Under the following conditions： Fe²⁺ mass concentration is 400 mg/L of pickling liquid waste,dissolved oxygen 70%,pressure difference 0.1 MPa,room temperature 18-25℃,pH 6-9,and the hydraulic retention time 2 h,the turbidity of effluent water is <2 NTU,pH accords with the national discharge standards.

Key words: multi-channel membrane elementairlift reactorwastewater treatment, membrane separation

中图分类号: 

• X703.1