Influence of Adding Plant Fly Ash on The Geotechnical Properties and Pollution of Sanitary Landfill Soil

Salim, Abdulrahman A.; Mohammed, Zainab B.; Fattah, Mohamed Y.

doi:10.30684/etj.2022.132687.1136

	Influence of Adding Plant Fly Ash on The Geotechnical Properties and Pollution of Sanitary Landfill Soil
Engineering and Technology Journal
Article 5, Volume 40, Issue 11, November 2022, Pages 1385-1398 PDF (1.9 M)
Document Type: Research Paper
DOI: 10.30684/etj.2022.132687.1136
Authors
Abdulrahman A. Salim^* ¹; Zainab B. Mohammed²; Mohamed Y. Fattah³
¹Civil Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.
²Civil Engineering department- university of technology, Baghdad, Iraq.
³Civil Engineering Department ,University of Technology, Baghdad, Iraq
Abstract
This paper investigates the impact of the plant fly ash (dry tree leaves) addition on the geotechnical properties of the landfill soil, where an engineering laboratory landfill simulating a real landfill was manufactured. Two percentages of plant fly ash (10% and 15%) were used to reduce or prevent the penetration of heavy metals resulting from the decomposition of landfill waste into the soil and conducting laboratory tests such as the Atterberg test, specific gravity test, compaction test, permeability test, SEM test, and heavy metals analysis. The results of laboratory tests indicate a decrease in the plastic limit and the liquid limit with the addition of plant fly ash, as well as a decrease in the specific gravity and a decrease in dry unit weight with an increase in the need for water content when adding plant fly ash. In contrast, the permeability increased with the addition of plant fly ash. In the most important laboratory test, which is the chemical analysis of soil metals, the soil improved with plant fly ash gave results indicating a lower level of metals pollution at depths of (10 cm, 20 cm, and 30 cm) of soil layer compared to natural soil. The analysis was conducted on 7 basic pollutants (cadmium, copper, iron, Manganese, Zinc, Chromium, and lead), where the percentage of pollutants decreased in improved soil compared to natural soil under the same conditions by (50%, 74%, 62%, 68%, 60%, 68%, and 55%) respectively.
Highlights
Using the addition of plant fly ash (dry tree leaves) on the geotechnical properties of the landfill soil. Two percentages of plant fly ash (10% and 15%) were used. The soil improved with plant fly ash gave results indicating a lower level of heavy metal pollution. The results indicated a decrease in the plastic and liquid limits with the addition of plant fly ash, and a decrease in the specific gravity and dry unit weight.
Keywords
Clay soil; Improvement landfill; Plant fly ash; Pollution soil; Environmental

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