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.
Abstract
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 8cycles 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
COD /
臭氧 /
活性炭 /
三维电极 /
油田压裂返排液
Key words
activated carbon /
COD /
oilfield fracturing flowback wastewater /
ozone /
three-dimensional electrodes
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基金
国家重大科技专项（2017ZX07202-001）
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