The advanced oxidation process based on sulfate radicals (SO₄^.−) is one of the most promising wastewater treatment technologies. In this study, we utilized potassium hydrogen phthalate (KHP) as an organic pollutant to configure simulated wastewater that was then treated by activation of sodium persulfate (PS) by zero-valent iron (ZVI) to produce SO₄^.−. Our results showed that the ZVI-PS system had a greater degradation rate in acidic, neutral, and weakly alkaline solutions compared with the Fenton method. After 180 min of reaction time under the experimental conditions (pH = 3.0, temperature = 20 °C, ZVI = 3.57 mM, and PS = 2.52 mM), chemical oxygen demand (COD) was 53.72%, indicating that these reaction conditions were optimal for COD degradation. This reaction was described by the kinetic rate Eqs. Y = K₁X + b (0–10 min) and Y = C + B X + K₂X² (30–180 min) within the above experimental conditions. The results of this study showed that the ZVI-PS system may be an interesting alternative for the treatment of organic pollutants.

中文翻译：

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ZVI-PS系统中活化过硫酸盐消除邻苯二甲酸氢钾

基于硫酸根（SO ₄ ^.-）的先进氧化工艺是最有前途的废水处理技术之一。在这项研究中，我们利用邻苯二甲酸氢钾（KHP）作为有机污染物来配置模拟废水，然后通过零价铁（ZVI）活化过硫酸钠（PS）进行处理以产生SO ₄ ^。-。我们的结果表明，与Fenton方法相比，ZVI-PS系统在酸性，中性和弱碱性溶液中的降解率更高。在实验条件下（pH = 3.0，温度= 20°C，ZVI = 3.57 mM和PS = 2.52 mM）反应180分钟后，化学需氧量（COD）为53.72％，表明这些反应条件是最佳的COD降解。该反应由动力学速率Eqs描述。Y  =  K ₁ X  +  b（0-10分钟），Y  =  C  +  BX  +  K ₂ X ²（30–180分钟）在上述实验条件下。这项研究的结果表明，ZVI-PS系统可能是处理有机污染物的有趣替代方法。