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采用四室电渗析反应器对农药生产污水处理厂尾水进行深度处理,尾水电导率为4.83 mS/cm,残留较高含量的NaCl和Na2SO4,同时残留毒性有机污染物,通过测定发现2-氨基-4-甲基苯并噻唑、粉唑醇和三环唑为其主要特征污染物,出水电导率为0.202 mS/cm,脱盐率为95.8%,离子去除率达90%以上,TOC去除率为72.2%,出水浊度和色度大幅改善,但存在出水偏酸的问题。废水中Na+、SO42-和Cl-分别被回收到浓缩室和阴极室形成酸碱循环利用。离子交换膜污染后,发现处理时间延长、出水水质TOC含量升高的问题,其中阳离子交换膜主要受到2-氨基-4-甲基苯并噻唑的污染,阴离子交换膜上污染物较为复杂,通过酸碱清洗和活性剂清洗均可使膜性能得到良好的恢复。
A four-chamber electrodialysis reactor was used to process the tail water of the pesticide production wastewater treatment plant. The conductivity of the tail water was 4.83 mS / cm, residual high content of NaCl and Na2SO4 remained, and toxic organic pollutants remained. Amino-4-methylbenzothiazole, flutriafol and tricyclazole were the main characteristic pollutants. The effluent conductivity was 0.202 mS / cm, the desalination rate was 95.8%, the ion removal rate was over 90% and the TOC removal rate was 72.2%, water turbidity and color significantly improved, but there is the problem of acid over water. Wastewater Na +, SO42- and Cl- were recovered to the concentration chamber and the cathode chamber to form acid-base recycling. After the ion exchange membrane was contaminated, it was found that the treatment time was prolonged and the effluent water had a high content of TOC. The cation exchange membrane was mainly contaminated by 2-amino-4-methylbenzothiazole. The contaminants on the anion exchange membrane were more complicated. Acid-base cleaning and cleaning agent can be a good film performance recovery.