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The wet oxidation of aqueous humic acids.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-02-24 , DOI: 10.1016/j.jhazmat.2020.122402 Manuel García 1 , Sergio Collado 1 , Paula Oulego 1 , Mario Díaz 1
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-02-24 , DOI: 10.1016/j.jhazmat.2020.122402 Manuel García 1 , Sergio Collado 1 , Paula Oulego 1 , Mario Díaz 1
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Humic acids are highly distributed in aqueous environments. This article examines in depth the advanced oxidation of humic acid aqueous solutions, in order to understand more complex oxidation processes such as those of the sewage sludge or landfill leachate, or the matrix effects triggered by the humic acids of natural organic matter (NOM) in the oxidation of other aqueous compounds as herbicides. Humic acids were efficiently oxidized; higher temperatures (180-220 °C) involved higher mineralization, the formation of intermediates with lower colour and also led to a higher concentration of organic acids at the end of the treatment, particularly acetic and oxalic ones. Nevertheless, humic acid wet oxidation was not sensitive to changes in the pressure, at least in the range tested (65-95 bar), but the initial pH (4-13) was found to be a key factor. Thus, alkaline media accelerated the humic acid removal, but more refractory intermediates were generated, and the organic acids, excepting malic acid, were more stable than in neutral or acidic media. Eventually, a lumped kinetic model was proposed and successfully fitted to the experimental data, including the effect of all the operating variables studied.
中文翻译：
腐殖酸水溶液的湿式氧化。
腐殖酸在水性环境中分布高度。本文深入研究了腐殖酸水溶液的高级氧化，以了解更复杂的氧化过程，例如污水污泥或垃圾渗滤液的氧化过程，或自然有机物腐殖酸（NOM）引发的基质效应。其他水性化合物作为除草剂的氧化作用。腐殖酸被有效地氧化；较高的温度（180-220°C）涉及较高的矿化度，形成具有较低颜色的中间体，并且在处理结束时还导致较高的有机酸浓度，尤其是乙酸和草酸。然而，腐殖酸湿式氧化至少在测试范围内（65-95 bar）对压力变化不敏感，但发现初始pH（4-13）是关键因素。因此，碱性介质加速了腐殖酸的去除，但生成了更多的难降解中间体，除苹果酸外，有机酸比中性或酸性介质更稳定。最终，提出了集总动力学模型并将其成功拟合到实验数据，包括所研究的所有操作变量的影响。
更新日期：2020-04-21
中文翻译：
腐殖酸水溶液的湿式氧化。
腐殖酸在水性环境中分布高度。本文深入研究了腐殖酸水溶液的高级氧化，以了解更复杂的氧化过程，例如污水污泥或垃圾渗滤液的氧化过程，或自然有机物腐殖酸（NOM）引发的基质效应。其他水性化合物作为除草剂的氧化作用。腐殖酸被有效地氧化；较高的温度（180-220°C）涉及较高的矿化度，形成具有较低颜色的中间体，并且在处理结束时还导致较高的有机酸浓度，尤其是乙酸和草酸。然而，腐殖酸湿式氧化至少在测试范围内（65-95 bar）对压力变化不敏感，但发现初始pH（4-13）是关键因素。因此，碱性介质加速了腐殖酸的去除，但生成了更多的难降解中间体，除苹果酸外，有机酸比中性或酸性介质更稳定。最终，提出了集总动力学模型并将其成功拟合到实验数据，包括所研究的所有操作变量的影响。
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