摘要：

采用臭氧高级氧化技术对煤气化废水进行了处理,考察各影响因子对其处理效果的影响。实验结果表明:在反应时间为40 min、pH为8.78、臭氧和H₂O₂投加量分别为126.2、57 mg/L的条件下,废水COD降到44.9 mg/L,去除率达64.42%;色度降到6倍,去除率达99.00%;浊度降到0.34 NTU,去除率达68.81%;B/C由0.04提高到0.34。O₃/H₂O₂技术处理效果优于单独臭氧氧化技术,且最佳pH有所降低。保持H₂O₂总投量相同,多次投加的去除效果明显优于一次性投加,且逐渐增大的投加方式下COD去除率最高。

关键词: 煤气化废水, 臭氧氧化, 高级氧化

Abstract:

Advanced ozone oxidation process has been used for treating coal gasification wastewater. The effects of various influencing factors on its treatment effectiveness are investigated. The experimental results show that under the following conditions:reaction time 40 min,pH=8.78,and the ozone and hydrogen peroxide dosage are 126.2 mg/L and 57 mg/L,respectively,the COD is decreased to 44.9 mg/L,the removing rate reaches 64.42%,the chroma is decreased to 6 times,the removing rate reaches 99%. And the turbidity is decreased to 0.34 NTU,the removing rate reaches 68.81%. Meanwhile,the B/C is increased from 0.04 to 0.34. The treatment effect of O₃/H₂O₂ process is better than that of individual O₃ oxidation process. In addition,the optimum pH is decreased. Experimental results demonstrate that with the same total dosage of hydrogen peroxide,the removing effectiveness obtained by multiple-dosing of hydrogen peroxide is much higher than that obtained by one-time dosing. The highest removing rate of COD is achieved when the dosing amount of the hydrogen peroxide is increased gradually.

Key words: coal gasification wastewater, ozonation, advanced oxidation

中图分类号: 

• X703.1