油田压裂废水的絮凝-Fenton氧化-SBR联合处理实验研究

针对中原油田压裂作业废水矿化度高、悬浮性固体（SS）含量高和有机物含量高且性质稳定的特点．采用絮凝-Fenton氧化-SBR联合处理方法对压裂废水进行了处理条件研究。结果表明：压裂废水COD值为2000mg／L-3000mg／L时。聚合硫酸铁（PFS）加量为50mg／L、聚丙烯酰胺（PAM）加量为4mg／L、搅拌速度100r／min下进行絮凝沉降30min，再于H2O2投加量为1000mg/L、FeSO4投加量为150mg／L反应温度为40℃条件下氧化处理45min后，进入SBR反应器曝气8h和沉降1h后。处理后压裂废水的COD去除率可达95．43％．出水COD值降至125．84mg／L．达到国家二级排放标准（GB8978—1996）。

Application of Flocculation-Fenton Oxidation-SBR Process on Treating Oil Field Fracturing Wastewater

According to the characteristics of fracturing wastewater from Zhongyuan oilfield,which has high salinity,suspended solids and organism concentration,the process of flocculation-Fenton oxidation-SBR was applied. The results showed that the fracturing wastewater diluting 3 times has better flocculated effect when the dosage of poly ferric sulfate (PFS) and polyacrylamide(PAM) were50 mg/L and 4mg/L respectively,and the stirring rate was100r/mmin. Then the flocculated fracturing wastewater was oxidized for 45min under the condition of 1000mg/L H2 O2,150mg/L Fe2SO4 respectively and under the temperature of 40℃. The COD concentration of the fracturing wastewater was dropped from 2753. 3mg/L to 125. 84mmg/L,and theCOD removing rate was 95.43%,after the flocculation-fenton oxidized wastewater was treated in the sequence batch reactor treatment (SBR)with 8 hours aerating time and 1 hour settling time.