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

ZHANG Yi-xin; CUI Xin-xin; LIU Shu-qin; ZHU Wei; HAN Xia; WANG Yu-jue

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China Environmental Science ›› 2020, Vol. 40 ›› Issue (5) : 2270-2275.

Environmental Ecology

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

ZHANG Yi-xin¹, CUI Xin-xin², LIU Shu-qin¹, ZHU Wei³, HAN Xia³, WANG Yu-jue²

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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.

Key words

activated carbon / COD / oilfield fracturing flowback wastewater / ozone / three-dimensional electrodes

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ZHANG Yi-xin, CUI Xin-xin, LIU Shu-qin, ZHU Wei, HAN Xia, WANG Yu-jue. Treatment of oil field fracturing flowback wastewater based on 3D/O₃ process[J]. China Environmental Science. 2020, 40(5): 2270-2275

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