含汞气田水的危害及处理工艺研究

Research on Hazard of Mercury-Containing Gas Field Wastewater and Treatment Process

含汞气田的开发致使气田水中常含有各种形态的汞,直接排放未经处理合格的含汞气田水将对生态环境造成严重破坏。含汞气田水的处理应将油水分离技术与污水脱汞工艺相结合,实际工程应用中,应根据原水水质的不同,选择不同的处理工艺组合处理含汞气田水。国外气田成功采用重力沉降-絮凝、絮凝-气浮、絮凝-吸附等工艺处理含汞气田水,处理后净化水中汞含量可降至μg/L级。借鉴国外含汞气田水处理工程经验并结合国内含汞气田的实际情况,加大对含汞气田水处理工艺的研究及应用,对中国含汞气田的合理开发,减少含汞气田水的危害,具有重要的现实意义。

Various forms of mercury are contained in the gas field wastewater with the production and development of the mercury-containing gas field.Direct discharge of unqualified mercury-containing wastewater without treatment will cause serious damage to the ecological environment.The treatment of mercury-containing wastewater should combine oil&water separation technology with mercury removal technology.In practical engineering applications,different treatment processes are often selected to treat mercury-containing gas field wastewater according to the different quality of raw water.In foreign gas fields,gravity sedimentation-flocculation,flocculation-air flotation and flocculation-adsorption processes have been successfully used to treat mercury-containing gas field wastewater.After treatment,the mercury content in purified water can be reduced to the level of ug/L.Drawing lessons from the experience of foreign mercury-containing gas field wastewater treatment projects and combining with the actual situation of domestic mercury-containing gas fields,it is of great practical significance to strengthen the research and application of mercury-containing gas field wastewater treatment technologies,to rationally develop mercury-containing gas fields in China and to reduce the hazard of mercury-containing gas field wastewater.