OCC制浆造纸废水的膜处理技术研究

运用聚醚砜超滤膜对OCC造纸废水二级生化出水进行了处理,旨在将处理后的出水回用于纸机系统。通过考察废液通量、总固形物去除率、CODcr去除率等指标,得出了OCC废水膜处理的优化工艺,即截留相对分子量1000,压力0.3MPa,温度20℃,转速200rpm,最佳透过比为95%。结果表明,在最佳操作条件下废水的通量为27.6L/（m^2·h）,总固形物（TS）从6.96g/L降低到4.32g/L,CODcr从812mg/L降低到117mg/L,阳离子需求量（CD）从1.7532meq/L降低到0.0158meq/L,色度由2381倍降低到25倍,可满足纸机水回用的要求。

Study on membrane treatment technology for OCC papermaking wastewater

The polyethersulfone UF membrane separation technique was used to OCC papermaking wastewater after secondary biological treated,to make it reusable for the paper machine system . Flux, retention of total solid and CODcr was studied, then the filtration parameters were optimized as follows： relative molecular weight cut- off at 1000, trans- membrane pressure at 0.3MPa, feed temperature at 20℃, cross- flow velocity at 200 rpm and permeate rate at 95%. The average permeate flux under these conditions was 27.6 L/ （m^2·h）, and the content of total solid （TS） was decreased from 6.96 g/ L to 4.32 g/ L,CODcr was decreased from 812 mg/ L to 117 mg/ L, cationic demand （CD） was decreased from 1.7532 meq/ L to 0.0158 meq/ L,chroma was decreased from 2381 times to 25 times,which can be reused to paper machine system.