O3／UV预处理磺酰脲类除草剂生产废水的研究

采用O3／UV工艺预处理磺酰脲类除草剂生产废水，考察了初始pH值、臭氧投量、叔丁醇投加等因素对废水处理效果的影响，并初步探讨了该工艺处理废水的反应机理。实验结果表明，在废水初始pH为13．59和臭氧投量为65．08mg／min的条件下，预处理80min后废水COD去除率达63．47％，BOD5／COD由0．03提高至0．56，EC50从11％提高至55％。随着叔丁醇浓度的增加，废水COD去除率明显降低，证明该反应体系有·OH存在；体系中加入MnO2后废水COD去除率下降了16％，氧化效率明显下降，证明该反应体系内中间产物HO2O在O3／UV降解有机废水过程中起到了重要的作用。

Study on sulfonylurea herbicide wastewater pretreatment using O3/UV process

The oxidation of sulfonylurea herbicide wastewater by means of OJUV was studied. The influence of different experimental parameters including pH, dosage of ozone and tert-butanol was observed and the mechanism of O3/UV was discussed. The optimum conditions were found to be as follows： pH 13.59, used ozone dosage 65.08 mg/ min and contact time 80 min. Under these optimum conditions, a COD reduction of 63.47% could be reached and an increase of ECs0, as a measure of acute toxicity, from 11% （untreated wastewater） to 55% was observed while biode- gradability of wastewater, measured as BOD5/COD, increased from 0.03 （untreated wastewater） to nearly 0.56. The removal efficiency of COD decreased rapidly with the increase of the concentration of tea-butanol, which demonstrated the existence of · OH in O3/UV system. The addition of MnO2 led to 16% reduction of COD, which proved that the presence of H2O2 played an important role in the wastewater treatment.