O3/UV预处理磺酰脲类除草剂生产废水的研究
Study on sulfonylurea herbicide wastewater pretreatment using O3/UV process
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摘要: 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65.08 mg/min的条件下，预处理80 min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H2O2在O3/UV降解有机废水过程中起到了重要的作用。
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关键词:
- 磺酰脲类除草剂生产废水 /
- O3/UV工艺 /
- 可生化性 /
- 毒性
Abstract: The oxidation of sulfonylurea herbicide wastewater by means of O3/UV 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 EC50， as a measure of acute toxicity， from 11% (untreated wastewater) to 55% was observed while biodegradability 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 tert-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.-
Key words:
- sulfonylurea herbicide wastewater /
- O3/UV process /
- biodegradability /
- toxicity
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