Abstract:

The high concentration waste liquid from the waterborne automobile coating workshop was treated with two-stage membrane and biological process after coagulation-flocculation as pretreatment. The COD was reduced from 1.75×10 ⁵ mg/L to about 1.10×10 ⁴ mg/L, which indicated a removing rate of 93.7%, wherein the COD removing rate by nanofiltration was 25%~31% and the COD removing rate by reverse osmosis was 85%~93%. The performance of the tubular nanofiltration membrane and the vibrating nanofiltration membrane were compared in terms of the membrane flux, which showed that the performance and durability of the vibrating nanofiltration were better than that of the tubular membrane. In addition, the results of energy disperse spectroscopy (EDS) analysis indicated that the waterborne paint was based on the acrylic system with high sulfuration.

Key words: waste liquid of waterborne paint, nanofiltration, reverse osmosis, membrane flux, particle size distribution

摘要：

针对某整车厂涂装车间产生的高浓度水性漆废液,经混凝预处理后,采用纳滤-反渗透工艺进行处理。膜处理过程采用纳滤-反渗透二级膜处理,使COD(化学需氧量)从1.75×10 ⁵ mg/L左右降低到1.10×10 ⁴ mg/L左右,去除率达93.7%。其中,纳滤的COD去除率在25%~31%,反渗透对纳滤进水的COD去除率在85%~93%。通过考察膜通量,比较管式纳滤膜和振动纳滤膜的性能,表明振动膜的处理性能和耐用性高于管式膜。能谱仪(EDS)分析表明,该水性漆为丙烯酸类,且硫化程度较高。

关键词: 水性漆废液, 纳滤, 反渗透, 膜通量, 粒径分布

CLC Number: 

• TQ630.9