Abstract
The chemical oxygen demand was over standard seriously due to residual organic additives in sulfonated drilling wastewater, especially sulfonated phenolic resin with hardly degradable chemical structure. The novel solar-assisted catalytic oxidation process was developed to remove the organic pollutants in sulfonated drilling wastewater. The factors including irradiation light source, oxidant, Fe2+, were investigated. The results showed that, solar has more catalytic effects than UV on H2O2-K2S2O8/Fe2+system, H2O2- K2S2O8/Fe2+system was more effective in degrading organic pollutants than H2O2/Fe2+and K2S2O8/Fe2+, in which the synergies occurred between H2O2and K2S2O8in the solar-assisted catalytic oxidation process. The removal amount of organic pollutants was increased with the dosage of Fe2+additon. With the catalytic oxidation process developed, the COD was reduced to 114.4 mg·L-1. Meanwhile, the sulfonated phenolic resin was completely destroyed, and heavy metal was decreased significantly.
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