Using the Sewage Sludge, Bentonite and Lime to Reduce the Erosion of Loess Soils and Protect the Gas Pipelines in Golestan Province.

Document Type : Research Paper

Authors

1 Department of Soil Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

2 Department of Soil Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.

3 National Gas Company of Golestan Province, Gorgan, Iran.

Abstract

Loess soils are very sensitive to water and wind erosion due to their fine particles (silt size), which requires the use of modifiers to increase their stability. This research was conducted with the aim of using effective solutions to increase the stability of loess soils. According to studies, using soil mixed with sewage sludge, bentonite, and lime (8%) is very effective in increasing the adhesion of soil particles and reducing its erosion. For this purpose, sewage sludge was purchased from the Gorgan waste water treatment plant, bentonite and lime were purchased, loess sample was taken from the Saadabad region and all samples were transferred to the laboratory. In the laboratory, the contents of heavy metals, organic matter, bulk density, shear strength, percentage of stable aggregates, pH, and EC were measured in the treatments of sewage sludge, bentonite, and lime mixed with loess (8%), and control soil. In addition, in every study treatment that combined with loess soil and control soil, the amount of sediment output from them was measured by the flume of simulated rain. The results showed that the use of sewage sludge, with a lower amount of sediment produced (92.15gr) and the higher content of organic carbon (1.59%), shear strength (1.36 N.cm-2), percentage of stable aggregates (1.21%), and heavy metals with in permissible range of EPA (2003) is the most appropriate treatment of this study to increase the stability of loess aggregates. Therefore, sewage sludge can be used to increase the stability of loess soil around gas pipes.

Keywords

Desert
Volume 30, Issue 1
June 2025
Pages 173-190

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