摘要：

油田开发生产过程中产生和排放的含油废水含有多种污染物, 严重污染了生态环境。石油工业含油废水常用PAC絮凝法处理, 但处理后废水的含油量、COD_Cr难以达标。作者采用PAC絮凝—膜分离法联合处理油田含油废水, 效果显著。实验结果表明:处理后的含油废水出水水质与絮凝条件、过滤条件等操作参数有关。当PAC投加质量浓度为70～80 mg/L, 反应pH为7～8, 反应时间为70 min, 微滤过滤温度为40℃, 错流速度为2 m/s时, 含油废水中的油、COD_Cr和悬浮物的去除率分别达到99%、98%和91%, 出水水质可达一级排放标准。

关键词: 絮凝, 膜分离, 含油废水, 废水处理

Abstract:

In petroleum production, many kinds of pollutants come into being and are discharged, polluting the ecological environment badly. PAC flocculation was usually applied to the treatment of oil-bearing wastewater in petroleum production. However, the oil-bearing content and COD_Cr of the wastewater are difficult to reach the criteria by this method. But when PAC flocculation-membrane separation is applied to the treatment of oil-bearing wastewater, remarkable effect has been obtained. The results show that the water quality of the treated oil-bearing wastewater is related to the operational parameters of flocculation condition, filtration condition, etc. When the dosage of PAC is 70-80 mg/L, pH value is 7-8, reaction time is 70 min, micro-filtration temperature is 40℃, and the velocity of flow are 2m/s, the removal rates of oil, COD_Cr and suspension substances are up to 99%, 98% and 91% respectively. The effluent water quality could reach the first class standard of discharge.

Key words: flocculation, membrane separation, oil-bearing wastewater, wastewater treatment

中图分类号: 

• X703.1