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Advanced oxidation methods for the treatment of the olive oil mill wastewaters.

机译：用于处理橄榄油厂废水的高级氧化方法。

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摘要

Ozone is a powerful oxidising agent able to achieve the degradation of the phenolic compounds found in olive oil mill wastewaters. Carboxylic acids and aldehydes are obtained as major degradation products.; A mechanism has been proposed to explain the degradation of the cinnamic acid derivatives. The rate of the degradative reaction depends on the pH and the substitution of the aromatic ring. UV radiation and the combination UV-ozone do not improve the oxidative process.; 2,4,6-triphenylpyrylium cation is able to catalyse the photodegradation of the phenolic compounds, using atmospheric oxygen as the real oxidising agent and solar light as a source of energy. This photocatalyst acts via an electron-transfer mechanism. The pyrylium salt-catalysed solar photodegradation of the phenolic pollutants follows a first order kinetics, and the value of the rate constant depends on the substitution of the aromatic ring.; The existence of an electron-transfer mechanism between the pyrylium cation and the substrate is shown by the linear relationship observed between the decrease of the fluorescence emission of the pyrylium cation and the concentration of the substrate (Stern-Volmer relationship). The rate constant for the electron-transfer process calculated from the Stern-Volmer plot is in good correlation with the degradation yields obtained in the solar reactions.; The ozonisation process produces a strong increase in the biodegradability in the samples that have been studied, while in the case of the pyrylium salt this effect is not found. This fact can be explained by the different mechanism followed in both cases.
机译：臭氧是一种强大的氧化剂，能够实现橄榄油厂废水中酚类化合物的降解。羧酸和醛是主要的降解产物。已经提出了一种机理来解释肉桂酸衍生物的降解。降解反应的速率取决于pH值和芳环的取代。紫外线辐射和紫外线臭氧的组合不能改善氧化过程。使用大气中的氧气作为真正的氧化剂，使用太阳光作为能源，2,4,6-三苯基吡啶鎓阳离子能够催化酚类化合物的光降解。该光催化剂通过电子转移机理起作用。吡啶盐催化的酚类污染物的太阳光降解遵循一级动力学，速率常数的值取决于芳环的取代。通过观察到的吡啶阳离子的荧光发射的减少与基质浓度之间的线性关系（斯特恩-沃尔默关系）表明了吡啶阳离子与底物之间存在电子转移机理。由斯特恩-沃尔默曲线计算出的电子转移过程的速率常数与在太阳能反应中获得的降解产率具有良好的相关性。臭氧化过程使已研究样品的生物降解能力大大提高，而在吡啶鎓盐的情况下，未发现这种作用。可以通过两种情况下采用的不同机制来解释这一事实。

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  • 作者

    Arques Sanz, Antonio.;

  • 作者单位

    Universidad Politecnica de Valencia (Spain).;

  • 授予单位 Universidad Politecnica de Valencia (Spain).;
  • 学科 Chemistry Biochemistry.; Agriculture Food Science and Technology.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 138 p.
  • 总页数 138
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物化学;农产品收获、加工及贮藏;
  • 关键词

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