臭氧联合光电催化氧化处理反渗透浓水技术的研究

炼化企业双膜系统反渗透单元浓水的COD浓度高、难生化降解且盐含量高，因此很难处理。尝试采用臭氧联合光电催化氧化技术处理炼油废水反渗透浓水，效果较好。考察了水中臭氧浓度、废水pH、废水温度对该体系运行效果的影响，结果表明：水中臭氧浓度及废水pH对处理效果有一定影响，而温度影响不大； 对于COD浓度为200~250 mg/L、石油类浓度为15~18 mg/L的进水，采用该技术在废水pH=9、水中臭氧浓度16 mg/L、臭氧预曝气时间10 min、光电催化单元停留时间60 min的条件下进行处理后，出水COD浓度低于50 mg/L、石油类浓度低于0.5 mg/L，完全满足企业对出水水质的要求。

STUDY ON OZONATION–PHOTOELECTROCATALYSIS COMBINATION TECHNIQUE FOR REVERSE OSMOSIS CONCENTRATED WASTEWATER TREATMENT

The reverse osmosis concentrated water from double-membrane process of petrochemical plant is hard to treat for its high COD, poor biodegradability and high salinity. The test found that good results can be obtained by ozonation – photoelectrocatalysis combined technique. In this paper, three factors, namely O3 concentration, pH and temperature, which influence the treatment efficiency of the concentrated water, were examined. The results show that COD and oil concentration in the effluent are less than 50 mg?L-1 and 0.5 mg?L-1, respectively, when the wastewater with COD of 200-250 mg/L, oil concentration of 15-18 mg/L is treated under the conditions of the optimal pH value of 9, the O3 dosage of 16 mg/L, preaeration 90 min in O3 and reside time of 60min in photoelectrocatalysis unit. The qualities of the treated water meet the requirements of the enterprise.