煤化工废水处理系统反渗透膜污堵原因分析及解决措施

Cause analysis and countermeasures of reverse osmosis membrane fouling in coal chemical wastewater treatment system

针对某煤化工废水处理系统反渗透膜频繁污堵制约装置连续运行问题,对进水水质、膜面污染物组成成分、在线氧化还原电位(ORP)仪表准确性等进行分析,结果表明膜进水中高含量的有机物与投加过量的还原剂协同作用引发的有机污染为膜系统发生污堵的根本原因。通过采取增大超滤产水余氯改善水体杀菌效果、调整还原剂加药量提高膜进水氧化性、加强在线仪表清洗校正频次、优化预处理工艺参数等处理措施,有效解决了生产运行问题,有机污染、药剂污染产生隐患大大降低,膜系统实现高效稳定运行。

In view of the problem that frequent fouling of reverse osmosis membrane in a coal chemical wastewater treatment system restricting the continuous operation of the device,the influent water quality,the composition of the membrane surface pollutants,and the accuracy of online oxidation-reduction potential(ORP)meter were analyzed.The results showed that,the synergic effect of high content of organic matters in the influent water and excessive reducing agent led to organic pollution was the root cause of fouling and blocking in the membrane system.By increasing the residual chlorine of the ultrafiltration produced water to improve the bactericidal effect,adjusting the dosage of reducing agent to improve the oxidability of the membrane inlet water,strengthening the frequency of online instrument cleaning and correction,optimizing the pretreatment process parameters and some other treatment measures,the operation problems were effectively solved,the hidden dangers of organic pollution and pharmaceutical pollution were greatly reduced,and the membrane system realized efficient and stable operation.