Abstract: High voltage pulsed discharge /O3 combined technology was utilized to treat oilfield wastewater and improve the biodegradability. The changes of COD、BOD5 and BOD5/COD were investigated under different conditions. Water samples were analyzed by GC-MS to investigate the mechanism of biodegradability improvement. The results showed that the efficiency of HVPD/O3 combined technology was higher than the separate HVPD and O3 treatment respectively，BOD5/COD was up to 0.31 in 5minutes and 0.46 in 10 minutes，the biodegradability of oilfield wastewater was improved effectively. In addition，the GC-MS results indicated that the large molecular organic pollutants in oilfield wastewater were degraded to low molecular pollutants after HVPD/O3 combined technology treatment.

摘要： 分别考察了高压脉冲放电单独作用、O3单独作用以及两者协同作用下对油田污水COD、BOD5以及BOD5/COD指标的影响，探讨上述技术应用于提高油田污水可生化性的可行性；同时对处理前后水样进行GC-MS分析以研究可生化性提高的机理。结果表明：协同作用的处理效率明显高于两者单独作用，5 min的处理时间就可以提高BOD5/COD至0.31，10min后BOD5/COD已达0.46，可生化性能大大增强，协同作用提高油田污水可生化性在技术上完全可行；GC-MS分析表明：高压脉冲放电/O3协同作用短时间内提高油田污水生化性的原因是将难降解高分子有机物氧化成为易生物降解的低分子量物质。