Investigating the zeolite and bentonite adsorbent effect on the static, dynamic, and environmental parameters of soil

IF 1.3 Q3 ENGINEERING, GEOLOGICAL

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-08-11 DOI:10.1680/jgrim.21.00061

M. H. Zade, Mahmuod Hassanlourad, S. .. Naeini

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引用次数: 2

Abstract

Contamination of soils and groundwater resources has become one of the most serious global environmental problems in recent years. The use of natural and inexpensive adsorbents such as zeolite is one of the appropriate methods to prevent the spread of contaminants and increase the adsorption capacity of the soil. Therefore, in the present study, zeolite is used as an option to improve the soil environmental condition. In this research, the behavior of the mixture of sand with 15% kaolinite clay is investigated at first, in both conditions of non-contaminated and contaminated with lead nitrate. Due to the limited adsorption capacity of the sand containing kaolinite, different percentages of zeolite adsorbent (as 5, 10, and 15 percent of soil weight) were added to this mixture to investigate the adsorption capacity and changes in strength parameters of the soil and adsorbent mixture. These parameters were also compared between zeolite and bentonite adsorbents. According to the results of the atomic adsorption test, zeolite has a favorable effect on increasing the adsorption capacity of heavy metals in soils such that by adding 5% zeolite, the amount of lead adsorption capacity increases by about 70%. Followed by investigating the static behavior and adsorption capacity of different compounds of soil containing adsorbent and without adsorbent, the dynamic behavior of these compounds in both conditions of non-contaminated and contaminated with lead nitrate was studied. The results show that in both contaminated and uncontaminated conditions, the initial shear modulus decreases with increasing zeolite content adsorbent. Also, dynamic behavior shows that in the combination of soil with both types of adsorbents, by increasing the concentration of heavy metal, the cycles corresponding to Ru decreases.

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研究了沸石和膨润土吸附剂对土壤静态、动态和环境参数的影响

土壤和地下水资源污染已成为近年来最严重的全球性环境问题之一。使用沸石等天然廉价的吸附剂是防止污染物扩散和增加土壤吸附能力的适当方法之一。因此，在本研究中，沸石作为改善土壤环境条件的一种选择。在本研究中，首先研究了15%高岭石粘土混合砂在未污染和受硝酸铅污染两种情况下的行为。由于含高岭石砂的吸附能力有限，在混合土中加入不同比例的沸石吸附剂(分别为土重的5%、10%和15%)，考察混合土和吸附剂的吸附能力和强度参数的变化。并对沸石和膨润土吸附剂的这些参数进行了比较。原子吸附试验结果表明，沸石对增加土壤中重金属的吸附量有较好的效果，加入5%沸石，对铅的吸附量增加约70%。研究了含吸附剂和不含吸附剂土壤中不同化合物的静态行为和吸附能力，研究了这些化合物在未污染和污染硝酸铅条件下的动态行为。结果表明，在污染和未污染条件下，初始剪切模量随吸附剂沸石含量的增加而减小。动态行为表明，两种吸附剂组合时，随着重金属浓度的增加，Ru对应的循环减少。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Civil Engineers-Ground Improvement ENGINEERING, GEOLOGICAL-

CiteScore

3.10

自引率

8.30%

发文量

期刊介绍： Ground Improvement provides a fast-track vehicle for the dissemination of news in technological developments, feasibility studies and innovative engineering applications for all aspects of ground improvement, ground reinforcement and grouting. The journal publishes high-quality, practical papers relevant to engineers, specialist contractors and academics involved in the development, design, construction, monitoring and quality control aspects of ground improvement. It covers a wide range of civil and environmental engineering applications, including analytical advances, performance evaluations, pilot and model studies, instrumented case-histories and innovative applications of existing technology.