压裂返排液的处理及回用  

Treatment and recycling of fracturing flow-back fluid

作　　者：赵浩楠 柯扬船[1] 陈长凤 胡旭 刘稳 ZHAO Haonan;KE Yangchuan;CHEN Changfeng;HU Xu;LIU Wen(College of Science,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)理学院

出　　处：《化工环保》2019年第4期396-402,共7页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金重大项目（51490650）;国家自然科学基金面上项目（51674270）;国家自然科学基金创新研究群体项目（51521063）;国家科技重大专项（2017ZX05009-003）

摘　　要：制备了沸石负载纳米TiO2催化剂和蒙脱土负载纳米零价铁吸附剂,结合传统处理技术,构建了“絮凝—预氧化(Fenton氧化)—沸石负载纳米TiO2催化臭氧氧化—蒙脱土载负纳米零价铁吸附”组合工艺,处理压裂返排液,考察了影响COD去除效果的因素。实验结果表明:在催化剂投加量1.0 g/L、臭氧通入时间5 min、吸附剂投加量5.0 g/L、吸附时间4 h的最佳条件下,COD从原水的4 032.60 mg/L降至37.03 mg/L,处理后出水各项指标均达到GB 8978—1996《污水综合排放标准》中的一级标准;80℃下,出水回用配制的压裂液黏度为4.4 mPa·s,高于自来水配制和压裂返排液配制的压裂液,耐温性有一定提升。Zeolite-supported nano TiO2 catalyst and montmorillonite-supported nano zero-valent iron adsorbent were prepared,and combining with traditional treatment technologies,a combined process of flocculation-pre-oxidation(Fenton oxidation)-catalyzed ozonation with zeolite-supported nano TiO2-adsorption on montmorillonite-supported nano zero-valent iron was constructed to treat fracturing flow-back fluid.The factors affecting COD removal were investigated.The experimental results showed that:Under the optimal conditions of catalyst amount 1.0 g/L,ozone introducing time 5 min,adsorbent amount 5.0 g/L and adsorption time 4 h,COD was decreased from 4 032.60 mg/L in raw water to 37.03 mg/L,and all indexes of the effluent reached the first-class standard of GB 8978-1996;The viscosity of fracturing fluid prepared with the recycling effluent was 4.4 mPa·s at 80℃,which was higher than that of the fracturing fluid prepared with tap water and the fracturing flow-back fluid,and the temperature resistance was improved in a certain extent.

关 键 词：压裂返排液 纳米TiO2催化剂 纳米零价铁 回用 

分 类 号：X524[环境科学与工程—环境工程]