页岩气增产采出水处理方法研究

针对页岩气增产采出水易起泡,难以平稳蒸发脱盐的问题,利用"预处理+多效蒸发"处理方法,对井站两种不同性质的采出水进行中试,连续监测各工艺单元处理后水质及蒸发出水水质。结果表明:通过破乳混凝、催化氧化、电荷中和及除硬等步骤,能够完全消除泡排水起泡性;中试稳定运行7d,两种泡排水蒸发出水水质稳定,COD浓度<55mg/L,NH4^+-N浓度<18mg/L,满足GB 8978-1996《污水综合排放标准》一级标准;Cl^-浓度<21mg/L,满足DB 51/190-1993《四川省水污染物排放标准》要求。

Study on Treatment Methods of Produced Water for the Shale Gas Production Promotion

In view of the fact that bubble drainage is easy to foam and difficult to be desalted by steady evaporation,pilot-scale tests of two different types of bubble drainage from wells stations were conducted to continuously monitor the quality of treated water and evaporated water from each process unit.The results showed that:after a series of steps,such as demulsification,coagulation,catalytic oxidation,charge neutralization and removing hardness,the bubble drainage can be completely eliminated.The effluent quality of the two kinds of foam drainage evaporated water was stable after 7 dof pilot operation,COD concentration was less than 55 mg/L,NH4^+-N concentration was less than 18 mg/L, meeting the first-class standard of "The Comprehensive Wastewater Discharge Standard "(GB 8978-1996);Cl^- concentration was less than 21 mg/L,meeting the requirements of "Sichuan Water Pollutant Discharge Standard"(DB 51/190-1993).