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Experimental study on mitigating wind erosion of calcareous desert sand using spray method for microbially induced calcium carbonate precipitation

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1556-1567页

作者： Monika Dagliya Neelima Satyam Meghna Sharma Ankit Garg Department of Civil Engineering Indian Institute of Technology IndoreIndoreIndia Department of Civil and Environmental Engineering Shantou UniversityShantouChina L.N.Gumilyov Eurasian National University Nur-SultanKazakhstan

Wind erosion is one of the significant natural calamities worldwide, which degrades around one-third of global land. The eroded and suspended soil particles in the environment may cause health hazards, *** and respiratory diseases, due to the presence of harmful contaminants, bacteria, and *** present study evaluates the feasibility of microbially induced calcium carbonate precipitation(MICP)technique to mitigate wind-induced erosion of calcareous desert sand(Thar desert of Rajasthan province in India). The temperature during biotreatment was kept at 36℃ to stimulate the average temperature of the Thar desert. The spray method was used for bioaugmentation of Sporosarcina(S.) pasteurii and further treatment using chemical solutions. The chemical solution of 0.25 pore volume was sprayed continuously up to 5 d, 10 d, 15 d, and 20 d, using two different concentration ratios of urea and calcium chloride dihydrate viz 2:1 and 1:1. The biotreated samples were subjected to erosion testing(in the wind tunnel) at different wind speeds of 10 m/s, 20 m/s, and 30 m/s. The unconfined compressive strength of the biocemented crust was measured using a pocket penetrometer. The variation in calcite precipitation and microstructure(including the presence of crystalline minerals) of untreated as well as biotreated sand samples were determined through calcimeter, scanning electron microscope(SEM), and energydispersive X-ray spectroscope(EDX). The results demonstrated that the erosion of untreated sand increases with an increase in wind speeds. When compared to untreated sand, a lower erosion was observed in all biocemented sand samples, irrespective of treatment condition and wind speed. It was observed that the sample treated with 1:1 cementation solution for up to 5 d, was found to effectively resist erosion at a wind speed of 10 m/s. Moreover, a significant erosion resistance was ascertained in15 d and 20 d treated samples at higher wind speeds. The calcite content

关键词： Control wind erosion Microbially induced calcium carbonate precipitation(MICP) surface strength Wind tunnel Calcite precipitation

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Experimental Study for the Cementation Effect of Dust Soil by Using Soybean Urease

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Journal of Renewable Materials 2023年第6期11卷 2893-2911页

作者： Jianwei Zhang Yue Yin Lei Shi Yi Han Mi Zhou Xihong Zhang School of Civil Engineering and Architecture Henan UniversityKaifeng475004China College of Civil and Transportation Engineering Hohai UniversityNanjing210024China State Key Laboratory of Subtropical Building Science South China University of TechnologyGuangzhou510640China School of Civil and Mechanical Engineering Curtin UniversityBentley6102Australia

Dust is an environmental and health *** this study,a new technology for dust suppressant is introduced using soybean urease with an optimal cementing *** carbonate is produced by soybean urease and cementing solution,which bonds the soil particles towards a dust suppressant.A laboratory wind tunnel test is carried out to examine its effectiveness and discover possible optimization *** factors,including soybean meal concentration,cementing solution concentration,and volume of solution per unit area,are examined to quantify their influences on soil transport mass,evaporation ratio,evaporation rate,surface strength,water retention ratio,and infiltration rate of soil treated by different dust *** tests are conducted to explore the performance of this method in the natural *** results show that compared with other dust suppressants,the optimized soybean urease has the smallest evaporation rate,a moderate infiltration rate,the largest water retention ratio and surface *** indexes of soybean urease for dust suppressant are found to be better than traditional *** the natural environment,soybean urease has a stronger anti-disturbance *** study concludes that soybean urease dust suppressant has great application potential as a cheap and green method.

关键词： Soybean urease dust suppressant wind erosion evaporation rate surface strength

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