Abstract:

According to the characteristics of the effluent quality from oil extraction process, anaerobic/hydrolysis and aerobic treatment process have been applied. The results indicate that with lower BOD₅/ COD_Cr values, this kind of wastewater could be effectively treated under the condition of HRTA= 6 h,HRTO=3.5 h,A/W ratio= 10～20 and water temperature= 50~60 e. The f inal effluent COD_Cr maintains at about 120 mg/L, and it could be 60～70 mg/L if the influence of chloride concentration is deducted. It meets the demands of the First Grade Standard of GB8978-1996.

Key words: oil extract ion wastewater, anaerobic/hydrolysis, aeration, high temperature

摘要：

根据油田采出水的水质特征，采用厌氧(水解)-好氧(接触氧化)处理工艺．实验表明，虽然油田采出水的BOD₅稳定/COD_Cr稳定较低，属于难生物降解废水，但是当温度为50～60℃时，选择厌氧停留时间为6h，好氧停留时间为3.5h，气水比为10～20，可使其出水的COD_Cr稳定在120mg/L左右．如果排除Cl^-产生的影响，COD_Cr稳定约为60～70mg/L，达到GB8978—1996一级排放标准．

关键词: 油田采出水, 厌氧水解, 接触氧化, 高温

CLC Number: 

• X703