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首页> 外文期刊>Environmental Science & Technology >Comparing the UV/Monochloramine and UV/Free Chlorine Advanced Oxidation Processes (AOPs) to the UV/Hydrogen Peroxide AOP Under Scenarios Relevant to Potable Reuse
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Comparing the UV/Monochloramine and UV/Free Chlorine Advanced Oxidation Processes (AOPs) to the UV/Hydrogen Peroxide AOP Under Scenarios Relevant to Potable Reuse

机译：在与可重复使用有关的情况下，将紫外线/一氯胺和紫外线/游离氯的高级氧化工艺（AOP）与紫外线/过氧化氢AOP进行比较

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摘要

Utilities incorporating the potable reuse of municipal wastewater are interested in converting from the UV/H_2O_2 to the UV/free chlorine advanced oxidation process (AOP). The AOP treatment of reverse osmosis (RO) permeate often includes the de facto UV/chloramine AOP because chloramines applied upstream permeate RO membranes. Models are needed that accurately predict oxidant photolysis and subsequent radical reactions. By combining radical scavengers and kinetic modeling, we have derived quantum yields for radical generation by the UV photolysis of HOCl, OCl~-, and NH_2Cl of 0.62, 0.55, and 0.20, respectively, far below previous estimates that incorporated subsequent free chlorine or chloramlne scavenging by the u0007C1 and u0007OH daughter radicals. The observed quantum yield for free chlorine loss actually decreased with increasing free chlorine concentration, suggesting scavenging of radicals participating in free chlorine chain decomposition and even free chlorine reformation. Consideration of reactions of u0007CIO and its daughter products (e.g., ClO_2~- ), not included in previous models, were critical for modeling free chlorine loss. Radical reactions (indirect photolysis) accounted for ~S096 of chloramine decay and ~80% of free chlorine loss or reformation. The performance of the UV/chloramine AOP was comparable to the UV/H_2O_2 AOP for degradation of 1,4-dioxane, benzoate and carbamazepine across pH 5.5—8.3. The UV/free chlorine AOP was more efficient at pH 5.5, but only by 30% for 1,4-dioxane. At pH 7.0-8.3, the UV/free chlorine AOP was less efficient "u0007CI converts to u0007OH. The modeled u0007Cl:u0007OH ratio was ~2096 for the UV/free chlorine AOP and ~3S96 for the UV/chloramine AOP such that u0007OH was generally more important for contaminant degradation.
机译：结合了城市废水可饮用水回用的公用事业，对于将UV / H_2O_2转换为UV /游离氯高级氧化工艺（AOP）感兴趣。 AOP处理反渗透（RO）渗透液通常包括事实上的UV /氯胺AOP，因为在渗透液RO膜上游施加了氯胺。需要准确预测氧化剂光解和随后的自由基反应的模型。通过结合自由基清除剂和动力学模型，我们得出了通过紫外光分解HOCl，OCl〜-和NH_2Cl分别为0.62、0.55和0.20的自由基产生的量子产率，远低于先前结合了随后的游离氯或六氯甲烷的估计值。通过u0007C1和u0007OH子自由基清除。观察到的游离氯损失的量子产率实际上随游离氯浓度的增加而降低，表明清除了参与游离氯链分解甚至游离氯重整的自由基。考虑u0007CIO及其子产物（例如ClO_2〜-）的反应（以前的模型未包括在内）对于模拟自由氯损失至关重要。自由基反应（间接光解）占〜S096的氯胺衰减和〜80％的游离氯损失或重整。在pH 5.5-8.3范围内，UV /氯胺AOP的性能与UV / H_2O_2 AOP相当，可降解1,4-二恶烷，苯甲酸酯和卡马西平。紫外线/游离氯AOP在pH 5.5时更有效，但对于1,4-二恶烷仅提高30％。在pH 7.0-8.3时，UV /游离氯AOP的效率较低。“ u0007CI转化为u0007OH。UV/游离氯AOP的模拟u0007Cl：u0007OH比为〜2096，UV /氯胺AOP的模拟uu为7S​​96，因此u0007OH为通常对于污染物降解更重要。

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  • 来源
    《Environmental Science & Technology》 |2017年第23期|13859-13868|共10页
  • 作者

    Yi-Hsueh Chuang; Serena Chen; Curtis J. Chinn; William A. Mitch;

  • 作者单位

    Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, Stanford, California 94305, United States;

    Galileo Academy of Science and Technology, 1150 Francisco Street, San Francisco, California 94109, United States;

    Galileo Academy of Science and Technology, 1150 Francisco Street, San Francisco, California 94109, United States;

    Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, Stanford, California 94305, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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