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Humic acid, dextran, and valeric acid representing macromolecules similar to compounds prevailing in treated wastewater induce soil hydrophobicity
Journal of Soils and Sediments ( IF 3.6 ) Pub Date : 2020-06-07 , DOI: 10.1007/s11368-020-02687-z
Shai Tolkin , Yona Chen , Jorge Tarchitzky

Purpose

Organic compounds originating from treated wastewater and soil texture have been reported to be the dominant factors influencing soil hydrophobicity. It is the aim of this investigation to elaborate the role of humic acid, dextran, and valeric acid, representing dissolved organic matter, polysaccharides, and fatty acids, respectively, as well as imitating their activity in inducing soil sub-critical water repellency induced by treated wastewater irrigation.

Materials and methods

The relationships between three model compounds imitating fractions of dissolved organic matter commonly found in treated wastewater, soil texture in relation to water repellency, were investigated. Three types of organic molecules, five soil mixtures with different specific surface areas, and three different organic compounds, as well as a mixture of the three, were tested.

Results and discussion

After 14–15 of wetting and drying cycles, low levels (sub-critical hydrophobicity) of water repellency developed in all soil mixtures were subjected to applications of several solutions of organic compounds, in comparison with a freshwater control. The highest degree of water repellency was exhibited by the soil with the lowest clay content (lowest specific surface area) and it decreased with increasing clay content (increasing specific surface area).

Conclusions

The order of intensity of sub-critical water repellency levels induced by the organic compounds was consistent, yet independent of soil texture. However, soil texture exhibited large influence on soil hydrophobicity in response to the various organic chemicals. Humic acid, the closest in structure to organic matter prevailing in treated wastewater, exhibited the largest effect in inducing soil hydrophobicity.



中文翻译:

代表大分子的腐殖酸,右旋糖酐和戊酸与处理后的废水中普遍存在的化合物相似,可引起土壤疏水性

目的

据报道,来自处理过的废水和土壤质地的有机化合物是影响土壤疏水性的主要因素。这项研究的目的是详细阐述腐殖酸,右旋糖酐和戊酸分别代表溶解的有机物,多糖和脂肪酸的作用,并模拟它们在诱导土壤诱导的亚临界拒水性中的活性。处理过的废水灌溉。

材料和方法

研究了三种模型化合物之间的关系,这些模型化合物模拟了处理废水中常见的溶解有机物含量,土壤质地与憎水性的关系。测试了三种类型的有机分子,五种具有不同比表面积的土壤混合物,三种不同的有机化合物以及这三种的混合物。

结果和讨论

经过14至15个湿润和干燥循环后,与淡水控制相比,对所有土壤混合物中形成的低水平(低于临界疏水性)的憎水剂进行了几种有机化合物溶液的施用。粘土含量最低(比表面积最低)的土壤表现出最高的拒水性,并且随着粘土含量的增加(比表面积增加)而降低。

结论

有机化合物诱导的亚临界憎水水平的强度顺序是一致的,但与土壤质地无关。但是,土壤质地对各种有机化学物质的响应对土壤疏水性影响很大。腐殖酸在处理后的废水中与有机物最接近的结构在诱导土壤疏水性方面发挥了最大作用。

更新日期:2020-06-07
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