摘要：

为降低出水COD，提高采油废水的可生化性，采用O₃、O₃/H₂O₂组合工艺对某油田采油废水进行处理，考察氧化反应时间、O₃质量浓度、pH、H₂O₂投加量、n（H₂O₂）:n（O₃）对废水处理效果的影响。结果表明，单独使用O₃处理油田采油废水时，在O₃为20 mg/L、反应时间为60 min、废水pH为8.50条件下，COD去除率为28.5%，B/C由0.08提至0.248；O₃/H₂O₂组合工艺的处理效果更显著，在O₃为30 mg/L、反应时间为60 min、H₂O₂投加量为0.24 g/L、废水pH为8.50的最佳条件下，COD去除率达到55.4%，B/C提升至0.440。氧化处理不仅降低了废水COD，还可提高废水的可生化性，是一种较为有效的预处理技术。

关键词: 采油废水, 可生化性, 臭氧, 高级氧化

Abstract:

In order to reduce the effluent COD and improve the biodegradability of the oil-extraction wastewater, O₃ and O₃/H₂O₂ combination process are used to treat the oil-extraction wastewater of an oilfield. The effects of influential factors such as the oxidation reaction time, the mass concentration of O₃, pH, the dosage of H₂O₂, n(H₂O₂):n(O₃) on the wastewater treatment are investigated. The results show that when O₃ is used to treat oil-extraction wastewater, the COD removal rate is 28.5% and the B/C is increased from 0.08 to 0.248 under the conditions of O₃ of 20 mg/L, reaction time of 60 min and wastewater pH of 8.50. The treatment effect of the O₃/H₂O₂ combination process was more significant. Under the optimal conditions of O₃ of 30 mg/L, reaction time of 60 min, H₂O₂ dosage of 0.24 g/L and wastewater pH of 8.50, the COD removal rate reaches 55.4% and B/C increased to 0.440. Oxidation treatment not only reduces the COD in wastewater, but also improves the biodegradability of wastewater. It is a more effective pretreatment technology.

Key words: oil-extraction wastewater, biodegradability, ozone, advanced oxidation

中图分类号: 

• X703.1