微絮凝-接触过滤技术在油田废水处理中的应用

Application of micro-flocculation contacting filtration in oilfield wastewater treatment

为了提高油田废水的处理效率,降低滤后水中油和悬浮物的质量浓度,文中通过系统优化改造开发了微絮凝-接触过滤工艺。筛选确定无机高分子聚合氯化铁作为本工艺的絮凝剂,最佳投药量为3 mg/L,经现场试验考察了本工艺对油田废水处理效果。结果表明,微絮凝-接触过滤工艺滤后水中油和悬浮物的平均质量浓度分别为1 mg/L和3 mg/L,去除率分别为92%和90%,远优于传统的直接过滤。说明油田废水经本工艺处理可达到油田回注水标准,无需经过二级过滤处理,因此节省了油田污水深度处理站基建和运行的投资,具有显著的经济效益。

To improve the treating effect of oilfield produced wastewater, the micro-flocculation filtration technology was developed. The polyferric chloride （PFC） was used as flocculant of 3 mg/L and contrasted with cationic poly acrylamide （CPAM）. The treating effect on plant site was studied. The results show that removal efficiency of oil and suspensions reaches 92% and 90% respectively, which is greatly higher than that of coventional direct filtration. The effluent after this treatment can reach the standard for reusing oilfield wastewater without any additional treatment, which can reduce the cost of investment distinctly.