液—液萃取处理高氯难降解有机废水

农药化工厂生产苯肼、苯唑醇、乙基氯化物过程排放的废水PH＝0．93，CODcr=39406mg/L,BOD5/CODcr=0.02,Cl^-=56563mg/L，是高氯难降解有机废水。采用三辛胺作萃取剂，用液－液取处理，三辛胺与水中Cl^-离子形成萃合物而使Cl^-转移到有机相，再经高效絮凝处理后，CDOcr去除率总计达89．8％，Cl^-去除率总计达83．2％，B／C比从0．02上升到0．34，可生化性大幅度提高。废水再经河水稀释进A／O池生化处理8d后，可达标排放。负载萃取液用5％NaOh水溶液反萃取。由于萃取剂回用降低了处理费用，液－液萃取在废水处理方面有良好的应用前景。

Treatment of chlorine-ion-rich and non-biodegradable organic wastewater by liquid-liquid phase extraction

Some chlorine\|ion\|rich non\|biodegradable organic wastewater is something negative in the production of phenylhydrazine and ethylchloride. The COD of the water is 39 406 mg/L; the pH Value is 0.93; BOD\-5/COD\-\{Cr\} is 0.02; and the chlorine ion is as high as 56 563 mg/L. Using Trioctylamine as the extractant, the chlorine ion of the water can be complexed to organic phase by extracting and flocculating. After being treated with PFS and PAM flocculants, the removal rates of COD and Chlorine ion reach 89.8% and 83.2% respectively. BOD\-5/COD\-\{Cr\} increases from 0.02 to 0.34. After the above procedure, the water is prepared for biochemical treatment. At last, wastewater treatment is done by 8 days A/O process diluted in a biochemical pool. The used extractant can be reused after regeneration by adding the same volume of 5% NaOH solution as that of extractant into the extract phase. The reusing of extractant reduces the cost; and the treatment method is prospective.