Abstract:

Using FT - 50 nanofiltration membrane, the wastewater in the two stage production processes of polyacrylonitrile is treated for reuse. The effects of operation pressures, operation flow rates and operation time on the nanofiltrarion process are analyzed. The removal efficiencies of COD_Cr, turbidity, conductivity and SS are also studied. The experimental results show that the SS is not detected, and the COD_Cr, turbidity and conductivity in the permeate are 83 mg/L, 2 NTU and 50 μS/cm respectively by the treatment of two-stage nanofiltration. The permeate could be used as the washing water of the polyacrylonitrile production and the wastewater might be zero discharge. Based on the experimental results, the recovery efficiency of pure water flux is about 95% after washing FT - 50 nanofiltration membrane with deionized water.

Key words: nanofiltration, polyacrylonitrile wastewater, wastewater reuse, zero discharge

摘要：

以废水回用为目的,用FT-50纳滤膜处理聚丙烯腈生产废水,对影响纳滤过程的因素,如操作压力、工作流量和运行时间进行了分析,并考察了纳滤膜对废水的COD_Cr、浊度、电导率和SS的去除效果。结果表明,经二级纳滤处理的出水中COD_Cr为83mg/L、浊度为2NTU、电导率为50μS/cm,检不出SS。此出水可作为聚丙烯腈生产过程中的冲洗用水,达到废水循环使用的目的,并可实现废水的零排放。同时,用去离子水冲洗就可使纳滤膜的纯水通量恢复率达到95%。

关键词: 纳滤, 聚丙烯腈生产废水, 废水回用, 零排放

CLC Number: 

• TQ028.8

• X703.1