Treatment of benzene-contaminated groundwater by ozone micro-nano-bubbles

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Benzene, a kind of volatile organic compound (VOCs) in organics-contaminated groundwater, is harmful to public health and the environment. Traditional methods of groundwater remediation such as pump & treat and chemical oxidation have limitations of high cost, low time efficiency, and secondary pollution. It is important to develop green and sustainable in-situ groundwater remediation technology. Ozone micro-nano-bubble (OMNB) technology, with a high transfer efficiency of oxidant, strong oxidation capacity, and low secondary pollution, has great potential for in-situ remediation of organics-contaminated groundwater. In this study, benzene is treated with OMNBs. The effects of ozone and H₂O₂ dosage, CO₃^2-, fulvic acid and Cl^- concentrations, and pH on the treatment of benzene-containing wastewater are investigated. The results show that the micro-nano-bubbles (MNBs) greatly prolong the half-life of ozone and the benzene removal rate increases with increasing ozone dose. An optimal hydrogen peroxide to ozone molar ratio of 0.15 exists for the enhancement of hydrogen peroxide to benzene treatment by ozone MNBs. Carbonate and fulvic acid in water inhibit the degradation of benzene by depleting the oxidant in the reaction system, while chloride ions have a facilitative effect on benzene degradation. The best removal effect for benzene is obtained when the solution is weakly acidic and the removal rate decreases with increasing pH. This study can provide a reference for the application of the ozone MNBs system in the field of benzene-contaminated groundwater remediation.

9th International Congress on Environmental Geotechnics (ICEG2023)

Characterisation, Remediation and Management of Contaminated Sites and Wastes