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摘要
Advanced oxidation process is a promising choice for treating low biochemical wastewater. A low biochemical pharmaceutical wastewater was pretreated by ferrous ion activated persulfate(Fe2+/PS) system. Through the bench scale test, the effects of pH,persulfate, ferrous sulfate and PAC mass concentration on the treatment of Fe VPS system and the optimal parameters of each influencing factor were investigated. According to the experimental results, pH had the greatest impact on the treatment effect of the Fe VPS system, followed by the mass concentration of ferrous sulfate and persulfate. The influence of PAC mass concentration could be ignored. Considering the cost factor comprehensively, the optimal combination of various parameters was pH?7, ferrous sulfate, sodium persulfate and PAC mass concentrations of 1.0,0.3 and 0.03 g/L,respectively. The active species playing the main degradation role in the reaction system were identified through ESR (Electron Spin-Resonance Spectroscopy) testing and quenching experiments. The results indicated that S04'~ was active in the Fe VPS reaction system and played a major degradation role in the reaction system. Through the pilot scale test, the changes of COD,TOC and NH3-N in wastewater before and after treatment by Fe VPS reaction system were investigated. The study showed that the treated wastewater had about 50% COD removal rate, 67% TOC removal rate, 30% NH3-N removal rate, and the average B/C value increased from 0.067 to 0.409. The results showed that advanced oxidation technology based on S04 ~ was a good pretreatment method for wastewater with low biochemical property and high organic concentration. ? 2023 Editorial Office of Industrial Water Treatment, CNOOC Tianjin Chemical Research and Design Institute Co., Ltd.
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