臭氧氧化-生物滤池处理某石化废水能效研究

Efficiency Study on Ozone Oxidation-biofilter for Petrochemical Wastewater Treatment

根据四川某石化二级反渗透出水的水质水量特点,采用臭氧氧化-生物滤池对石化浓水进行了处理。考察了臭氧投加量、pH对臭氧氧化效果的影响,确定了臭氧单元最佳臭氧投加量和pH值。结果显示:臭氧投加量在12 mg/L、pH为8~9时,COD进水指标从175 mg/L降低至47.5 mg/L以下,去除率达到约72.8%,氨氮值从17 mg/L降低至4.75 mg/L以下。石化污水处理后的COD、氨氮、总氮等指标达到了《国家污水综合排放标准》(GB8978-1996)中直接排放的水污染物最高允许排放浓度要求。

Based on the characteristics of the quality and quantity of secondary reverse osmosis effluent from a petrochemical plant in Sichuan,ozone oxidation-biofilter treatment was applied to the concentrated petrochemical wastewater. The impact of ozone dosage and pH on the effect of ozone oxidation was investigated,and the optimal ozone dosage and pH in the ozone unit were determined. The results showed that at pH 8 ~ 9 with 12 mg/L ozone dosage,influent COD concentration decreased from 175 mg/L to less than 47. 5 mg/L with a COD removal rate around 72. 8%.Ammonia nitrogen concentration also declined from 17 mg/L to less than 4. 75 mg/L. The combined treatment enabled effluent COD,ammonia nitrogen and total nitrogen concentrations of the petrochemical wastewater to meet the requirements of the maximum allowable discharge concentrations for directly discharged water pollutants in Chinese Integrated Wastewater Discharge Standard（GB8978-1996）.