三维电极耦合臭氧技术处理油田压裂返排液  

Treatment of oil field fracturing flowback wastewater based on 3D/O3 process

作　　者：张一欣 崔欣欣 刘淑琴[1] 祝威[3] 韩霞[3] 王玉珏[2] ZHANG Yi-xin;CUI Xin-xin;LIU Shu-qin;ZHU Wei;HAN Xia;WANG Yu-jue(School of Chemical and Environmental Engineering,China University of Mining and Technology,Beijing 100083,China;School of Environment,Tsinghua University,Beijing 100084,China;Sinopec Petroleum Engineering Co.,Ltd.,Dongying 257026,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]清华大学环境学院,北京100084 [3]中石化石油工程设计有限公司,山东东营257026

出　　处：《中国环境科学》2020年第5期2270-2275,共6页China Environmental Science

基　　金：国家重大科技专项(2017ZX07202-001)。

摘　　要：构建了一种活性炭三维电极耦合臭氧(3D/O3)的反应体系,研究了其对胜利油田压裂返排液COD的去除效果,探究了3D/O3体系的反应机制,考察了电流、臭氧浓度等过程参数对COD去除性能的影响.压裂返排液经3小时3D/O3处理后,COD去除率可达到78%,且在多个多周期运行后保持在60%以上.与之相比,单独三维电极和臭氧氧化仅能去除37%和17%的COD.研究结果表明,3D/O3体系可有效耦合活性炭吸附、电化学氧化、催化臭氧等多种反应机制,高效产生·OH氧化降解压裂返排液中的有机污染物和原位再生活性炭,有望为油田压裂返排液提供一种有效的处理技术.In this study,a three-dimensional electrode/ozone(3D/O3)system was developed by combining ozonation with electrolysis using granular activated carbon(GAC)as the particle electrodes,the developed 3D/O3 system was then used to treat the fracturing flowback wastewater from Shengli oil field.The reaction mechanism of the 3D/O3 system and the effects of process parameters(e.g.,current,ozone concentrations)on COD removal were investigated systematically.Results show that COD removal efficiency reached^78%after 3h of the 3D/O3 treatment,and could be maintained stably above 60%during 8 cycles of operation.In comparison,3D electrolysis and ozonation alone removed only^37%and 17%COD under similar reaction conditions.These results indicate that the 3D/O3 system effectively couples activated carbon adsorption,electrochemical oxidation,and catalytic ozonation to enhance hydroxyl radical generation to oxidize organic pollutants in the fracturing flowback wastewater and regenerate activated carbon.Therefore,it may provide a promising method to remove COD in hydraulic fracturing flowback wastewater.

关 键 词：油田压裂返排液 三维电极 活性炭 臭氧 COD 

分 类 号：X741[环境科学与工程—环境工程]