Peroxone (O3/H2O2) 水处理工艺的动力学建模辅助优化,Industrial & Engineering Chemistry Research

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Peroxone (O3/H2O2) 水处理工艺的动力学建模辅助优化
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-04-06 , DOI: 10.1021/acs.iecr.3c00020
Mahshid Mortazavi ₁ , Shikha Garg ₁ , T. David Waite ₁

Affiliation

_{在这项工作中，我们研究了 H 2} O ₂剂量、H ₂ O ₂剂量方法和富电子溶解有机物 (DOM) 对使用草酸盐的过氧酮 (O ₃ /H ₂ O ₂ ) 工艺性能的影响(OA) 作为目标有机化合物。_{我们的结果表明，用于 H 2} O ₂给药的方法（即单次、多次和/或连续注入）在 1 小时后对 OA 去除有显着影响，连续注入将近 100% 的 OA 被氧化总共 1 mM H ₂ O ₂，但当使用相同量的 H _{2时，仅去除了 48% 和 80% OA}O ₂ (1 mM) 分别应用于单次和多次注射。当H ₂ O ₂在整个过程中频繁或连续地以较小的量给药时，H 2 O 2 对H 2 O 2 无效清除的抑制导致^与单_次注入_高浓度H ₂ O ₂一开始。我们的结果进一步表明，高浓度腐殖酸（HA，一种典型的富电子 DOM）的存在促进了 O ₃衰变和伴随^•OH 的产生率，因此，单独通过臭氧显着提高了 OA 的氧化率。因此，在 HA 存在的情况下通过添加 H ₂ O ₂可能实现的^• OH 生成和相关 OA 氧化的任何增强将取决于^• OH 生成的程度，这是由 HA 促进的 O ₃衰变引起的。基于我们的结果，我们开发了一个数学模型，可用于预测^•过氧酮过程在一系列条件下的 OH 生成和 OA 氧化。该模型很好地描述了各种运行参数（包括臭氧用量、H ₂ O ₂用量、H ₂O ₂给药方法和 HA 的存在）对 OA 氧化的影响，并且有可能用于优化全面过氧酮系统中操作条件的选择。

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Kinetic Modeling-Assisted Optimization of the Peroxone (O3/H2O2) Water Treatment Process

In this work, we investigate the influence of H₂O₂ dosage, H₂O₂ dosing method, and electron-rich dissolved organic matter (DOM) on the performance of the peroxone (O₃/H₂O₂) process using oxalate (OA) as the target organic compound. Our results show that the method used for H₂O₂ dosing (i.e., single, multiple, and/or continuous injection(s)) has a significant influence on OA removal after 1 h with nearly 100% of OA oxidized by continuous injection of a total of 1 mM H₂O₂, but only 48 and 80% OA were removed when the same amount of H₂O₂ (1 mM) is applied in single and multiple injection(s), respectively. Inhibition of futile scavenging of ^•OH by H₂O₂ when H₂O₂ is dosed in smaller amounts either frequently or continuously throughout the process results in a higher efficiency of organic oxidation compared to that achieved with a single injection of a high concentration of H₂O₂ at the outset. Our results further show that the presence of high concentrations of humic acids (HA, a representative electron-rich DOM) promotes O₃ decay and concomitant ^•OH generation rates and, as a result, significantly enhances the oxidation rate of OA by ozone alone. As such, any enhancement in ^•OH generation and associated OA oxidation that might be achieved by H₂O₂ addition in the presence of HA will be dependent on the extent of ^•OH generation that results from HA-promoted O₃ decay. Based on our results, we have developed a mathematical model that can be used to predict ^•OH generation and OA oxidation by the peroxone process over a range of conditions. The model provides a good description of the influence of various operating parameters (including ozone dosage, H₂O₂ dosage, H₂O₂ dosing method, and the presence of HA) on OA oxidation and, potentially, can be used to optimize the choice of operating conditions in full-scale peroxone systems.

更新日期：2023-04-06

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