Oil-field wastewater was treated with the method " N2 flotation anaerobiosis-O2 oxidation of enhanced A/O method " to achieve the effectiveness and applicability of oil recycling, wastewater re-injection process and discharge process. The treatment results show that when oil content in the wastewater is 55-160 mg/L, COD is 390-630 mg/L, BOD is 70-110 mg/L, SS is 40-200 mg/L, removal rates of oil and suspended solids are above 90%, respectively. The anaerobic hydrolysis acidification treatment can significantly improve conditions of biological treatment, removal rates of COD and BOD are nearly 85%,respectively. The treated effluent for re-injection can meet Bl-level requirements of clasolite oil reservoir re-injection water quality recommended index. The treated effluent for discharge can meet the integrated wastewater discharge standard GB8978-1996.%对某油田污水采用“N2气浮厌氧—O2好氧强化A/O法”工艺流程实现油品回收,污水回注及排放的有效性和适用性进行了实验研究.试验结果表明,在原水水质中石油类在55～160 mg/L,COD含量在390～630mg/L,BOD含量在70～110 mg/L,SS在40～200 mg/L,该工艺对石油类、悬浮物的去除率可达90％以上；通过厌氧处理装置的水解酸化作用,可明显改善生化处理条件,COD、BOD去除率接近85％.污水回注处理能够达到《碎屑岩油藏注水水质推荐指标》B1级要求,污水排放处理能够满足《污水综合排放标准GB8978-1996》.
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