Abstract:
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 Fe2+/PS 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 Fe2+/PS 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 SO4 ·- was active in the Fe2+/PS 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 Fe2+/PS 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 SO4 ·- was a good pretreatment method for wastewater with low biochemical property and high organic concentration.
Key words:
low biochemistry,
persulfate,
advanced oxidation,
ferrous ion
摘要：
高级氧化法是处理低生化性废水的一种有前途的技术。采用亚铁离子活化过硫酸盐（Fe2+/PS）体系预处理某低生化性制药废水。通过小试研究考察了pH、过硫酸钠、硫酸亚铁和PAC质量浓度对Fe2+/PS体系处理效果的影响及各影响因素的最佳参数。结果表明，pH对Fe2+/PS体系处理效果的影响最大，其次是硫酸亚铁质量浓度和过硫酸盐质量浓度，PAC质量浓度的影响可以忽略不计。综合考虑成本因素，各参数的最佳水平组合：pH≈7、硫酸亚铁、过硫酸钠、PAC质量浓度分别为1.0、0.3、0.03 g/L。通过ESR（电子自旋共振）测试和猝灭试验，确定反应体系中起主要降解作用的活性物种。结果表明，SO4 ·-活跃于Fe2+/PS反应体系中，并在反应体系中起主要作用。通过中试研究考察了Fe2+/PS反应体系处理前后废水COD、TOC、NH3-N的变化。研究表明，经过处理后的废水，COD去除率为50%，TOC去除率为67%，NH3-N去除率为30%，平均B/C从0.067提升到0.409。基于SO4 ·-的高级氧化技术是一种很好的低生化性高浓度有机废水预处理方法。
关键词:
低生化性,
过硫酸盐,
高级氧化,
亚铁离子
CLC Number:
Yang MA, Gang YE, Yongwen MA, Jinquan WAN, Zhifei ZHANG, Yuwei BAI, Jing NING. Research on pretreatment of low biochemical wastewater by advanced oxidation technology based on SO4 ·-[J]. Industrial Water Treatment, 2023, 43(12): 73-78.
马阳, 叶刚, 马邕文, 万金泉, 张志飞, 白玉玮, 宁静. 基于SO4 ·-的高级氧化技术对低生化性废水的预处理研究[J]. 工业水处理, 2023, 43(12): 73-78.