土壤臭氧消耗：原位臭氧化过程中的一个关键因素,ACS ES&T Water

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土壤臭氧消耗：原位臭氧化过程中的一个关键因素
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-10-14 , DOI: 10.1021/acsestwater.1c00236
Zhian Ying _{1,

2,

3} , Yinon Yecheskel _{2,

3} , Mingxin Huo ₁ , Uwe Hübner ₄ , Ines Zucker _{2,

3}

Affiliation

原位化学臭氧化 (ISCO ₃)，其中气态臭氧被注入地下，是修复受污染地下水的常用方法，在很大程度上受到土壤本身（而不是目标污染物）不可避免地消耗臭氧的影响。在这项研究中，研究了以色列海岸线含水层的两种主要土壤类型的臭氧消耗。富含铁的土壤显示出比钙质土壤高得多的反应性。我们进一步研究了物理和化学土壤特性对有限和催化臭氧衰减、羟基自由基形成和臭氧传输行为的影响。在存在细小的土壤颗粒 (<100 μm) 的情况下，臭氧消耗量增加了 >90%，这是由于与粗土壤颗粒相比，大量的反应位点和臭氧消耗体的含量更高。土壤有机物消耗臭氧的速度是铁成分的两倍，以更高的速率促进自由基的形成，并且主要充当有限的臭氧消耗者。在连续进料柱实验中，在多孔介质中传输过程中，与铁组分的反应主导了催化臭氧消耗。总的来说，这项研究表明，土壤中臭氧反应的表征有助于评估 ISCO 的可行性和效率。₃并告知 ISCO ₃处理的设计，例如，需要注入额外的自由基促进剂。

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Ozone Consumption by Soils: A Critical Factor in In Situ Ozonation Processes

In situ chemical ozonation (ISCO₃), in which gaseous ozone is being injected into the subsurface, is a common method for remediating contaminated groundwater that is largely affected by the inevitable consumption of ozone by soil itself (rather than the target contaminants). In this study, ozone consumption by two main soil types of Israeli coastline aquifer was examined. Iron-rich soil showed considerably higher reactivity than did calcareous soil. We further investigated the effect of both physical and chemical soil characteristics on finite and catalytic ozone decay, hydroxyl-radical formation, and ozone transport behavior. Ozone consumption increased by >90% in the presence of fine soil particles (<100 μm), resulting from the large number of reactive sites and the higher content of ozone consumers compared to coarse soil particles. Soil organic matter consumed ozone twice as fast as iron components, promoted radical formation at higher rates, and mainly acted as a finite ozone consumer. In continuously fed column experiments, the reactions with iron components dominate catalytic ozone consumption during transport in porous media. Overall, this study demonstrates that the characterization of ozone reactions in soil can be helpful in evaluating the feasibility and efficiency of ISCO₃ and inform the design of ISCO₃ treatment, e.g., the need to inject additional radical promoters.

更新日期：2021-11-12

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