页岩气产出水的可行性处理工艺研究

Study on feasible treatment technologies for shale gas produced wastewater

针对页岩气产出水的合理处置及达标回用进行了研究,探讨了处理工艺的可行性。首先投加NaOH和Na_2CO_3进行碱化絮凝的预处理,充分混合后过滤;对滤后液进行三效蒸馏,分离得到残余母液和一、二、三效蒸馏液;

This paper studies the reasonable treatment and utilization of shale gas produced wastewater and discusses feasible treatment processes. Firstly,the waste water is pretreated through alkalization and flocculation with addition of NaOH and Na2CO3,and a supernatant is obtained after sufficient mixing and filtration.Secondly,three-effect evaporations are performed on the supernatant to separate the residue( mother liquor) and the first,second and third effect distillates.Thirdly,adsorption and photocatalytic integrated treatment is used to purify the first effect distillate,then the effluent water is mixed with the second and third effect distillates to meet the recycling water quality standards for refinery and chemical industry. Finally,the mother liquor from multiple-effect evaporations is treated by adsorption to reduce effectively COD content,which will be favorable for the subsequent treatment processes,i. e.,crystal desalination,flowback or re-injection.