改性磁性材料处理油田废水的研究

Study on Treatment of Oilfield Wastewater by Modified Magnetic Materials

以改性Fe3O4磁粉为磁种、改性Fe3O4磁粒为滤料,采用磁种—磁滤—砂滤联合工艺处理江苏油田废水,考察了磁种投加量、搅拌强度、磁感应强度及磁滤速度对除油效果的影响。结果表明,改性后的Fe3O4磁粉对油田废水有良好的除油效果,除油率比未改性的Fe3O4磁粉平均提高了17.5%。在磁种投加量为300mg/L、搅拌强度为250r/min、磁感应强度为0.0819T、磁滤速度为25m/h的最佳工艺条件下,当进水平均含油量为111.5mg/L时,出水平均含油量降为8.3mg/L,平均除油率达92.5%,达到了《污水综合排放标准》(GB8978—1996)的二级标准。

Using modified Fe3O4 powder as magnetic seed and modified Fe3O4 particles as magnetic filter media, the combined process of magnetic seed, magnetic filtration and sand filtration was applied for Jiangsu Oilfield wastewater treatment, and the influences of magnetic seed dosage, agitation intensity, magnetic induction and magnetic filtering velocity on oil removal efficiency were investigated. The results show that the modified Fe3O4 powder has an obvious oil removal effect on oilfield wastewater, and the oil removal rate is enhanced by 17.5% in average compared with non-modified Fe3O4 powder. Under the optimal process conditions of the magnetic seed dosage 300 mg/L, the agitation intensity 250 r/min, the magnetic induction 0. 0819 T and the magnetic filtering velocity 25 m/h, when the influent oil content is 111.5 mg/L, the effluent oil content reduces to 8.3 mg/L and the oil removal efficiency can reach 92, 5%, which meets the second class discharge standard in the Integrated Wastewater Discharge Standard （ GB 8978 - 1996）,