聚氯乙烯离心母液高品质回收工艺的研究

A study on the high-quality reuse process of polyvinyl chloride centrifugal mother liquid

采用膜生物反应器(MBR)和反渗透(RO)工艺对聚氯乙烯离心母液废水进行回收。研究了该系统工艺对有机物和悬浮固体的处理效果以及系统的耐冲击能力;观察了生物相在MBR系统中的变化情况及MBR膜片和反渗透膜的污染情况。试验结果表明,该工艺在稳定运行的情况下,废水总COD去除率可达到95%以上,MBR出水COD浓度低于40 mg/L,达到直接排放标准,再经过反渗透、离子交换或连续电解除盐(EDI)处理后,出水可以达到聚合回用水标准,回收率达到70%以上,而且,整个试验过程中膜耐污染性能良好。

In the pilot study on the treatment of polyvinyl chloride centrifugal mother liquid wastewater by using a combination of MBR and RO, the removal efficiency of organics and suspending solid together with the capability to resist the impact of the system were researched. The changes of the biological phase in the MBR and the membrane fouling of both membranes were observed . The experiment results show that the total removal efficiency of COD was over 95%, the effluent less than 40 mg/L can meet the requirement of wastewater discharge standard. Furthermore, the effluent of the MBR can reach the polymerization reuse water standard with a water recovery more than 70% after being treated by antiosmosis, Ion exchange or EDI. Film properties are in a good state during the experiment.