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Soil stabilization with microbially induced desaturation and precipitation (MIDP) by denitrification: a field study
https://orcid.org/http://orcid.org/0000-0002-5421-937X
https://orcid.org/http://orcid.org/0000-0002-5050-0260
https://orcid.org/http://orcid.org/0000-0001-9679-4914
https://orcid.org/http://orcid.org/0000-0003-4425-8639
https://orcid.org/http://orcid.org/0000-0002-1977-8598
https://orcid.org/http://orcid.org/0000-0002-3862-7314
https://orcid.org/http://orcid.org/0000-0003-4557-5249
A field trial was performed to test the feasibility of microbially induced desaturation and precipitation (MIDP) by denitrification for the stabilization of a silty soil. Indigenous nitrate-reducing bacteria were stimulated to produce nitrogen gas and calcium carbonate minerals by injecting a treatment solution containing calcium nitrate and calcium acetate into the ground. In situ measurements including electrical conductivity, volumetric water content, and chemical analysis of the extracted groundwater samples during treatment demonstrated denitrifying micro-organisms actively converted substrates and produced biogenic gas and minerals. However, the distribution of substrates and reaction products was significantly affected by preferential flow through more permeable soil layers in the upper part of the treated strata. Laboratory tests on soil samples indicated the presence of calcium carbonate. However, the background levels of calcium carbonate content were too high and too variable to quantify the obtained increase in calcium carbonate content by denitrification. Cone penetration tests and cross-hole measurements did not indicate a significant increase in strength or stiffness of the treated soil. However, desaturation through biogenic gas formation was confirmed by the volumetric water content measurements and by a decrease in pressure wave velocity in cross-hole seismic measurements. The results provided valuable lessons for future field applications of MIDP as ground improvement method.
Soil stabilization with microbially induced desaturation and precipitation (MIDP) by denitrification: a field study
https://orcid.org/http://orcid.org/0000-0002-5421-937X
https://orcid.org/http://orcid.org/0000-0002-5050-0260
https://orcid.org/http://orcid.org/0000-0001-9679-4914
https://orcid.org/http://orcid.org/0000-0003-4425-8639
https://orcid.org/http://orcid.org/0000-0002-1977-8598
https://orcid.org/http://orcid.org/0000-0002-3862-7314
https://orcid.org/http://orcid.org/0000-0003-4557-5249
A field trial was performed to test the feasibility of microbially induced desaturation and precipitation (MIDP) by denitrification for the stabilization of a silty soil. Indigenous nitrate-reducing bacteria were stimulated to produce nitrogen gas and calcium carbonate minerals by injecting a treatment solution containing calcium nitrate and calcium acetate into the ground. In situ measurements including electrical conductivity, volumetric water content, and chemical analysis of the extracted groundwater samples during treatment demonstrated denitrifying micro-organisms actively converted substrates and produced biogenic gas and minerals. However, the distribution of substrates and reaction products was significantly affected by preferential flow through more permeable soil layers in the upper part of the treated strata. Laboratory tests on soil samples indicated the presence of calcium carbonate. However, the background levels of calcium carbonate content were too high and too variable to quantify the obtained increase in calcium carbonate content by denitrification. Cone penetration tests and cross-hole measurements did not indicate a significant increase in strength or stiffness of the treated soil. However, desaturation through biogenic gas formation was confirmed by the volumetric water content measurements and by a decrease in pressure wave velocity in cross-hole seismic measurements. The results provided valuable lessons for future field applications of MIDP as ground improvement method.
Soil stabilization with microbially induced desaturation and precipitation (MIDP) by denitrification: a field study
https://orcid.org/http://orcid.org/0000-0002-5421-937X
https://orcid.org/http://orcid.org/0000-0002-5050-0260
https://orcid.org/http://orcid.org/0000-0001-9679-4914
https://orcid.org/http://orcid.org/0000-0003-4425-8639
https://orcid.org/http://orcid.org/0000-0002-1977-8598
https://orcid.org/http://orcid.org/0000-0002-3862-7314
https://orcid.org/http://orcid.org/0000-0003-4557-5249
A field trial was performed to test the feasibility of microbially induced desaturation and precipitation (MIDP) by denitrification for the stabilization of a silty soil. Indigenous nitrate-reducing bacteria were stimulated to produce nitrogen gas and calcium carbonate minerals by injecting a treatment solution containing calcium nitrate and calcium acetate into the ground. In situ measurements including electrical conductivity, volumetric water content, and chemical analysis of the extracted groundwater samples during treatment demonstrated denitrifying micro-organisms actively converted substrates and produced biogenic gas and minerals. However, the distribution of substrates and reaction products was significantly affected by preferential flow through more permeable soil layers in the upper part of the treated strata. Laboratory tests on soil samples indicated the presence of calcium carbonate. However, the background levels of calcium carbonate content were too high and too variable to quantify the obtained increase in calcium carbonate content by denitrification. Cone penetration tests and cross-hole measurements did not indicate a significant increase in strength or stiffness of the treated soil. However, desaturation through biogenic gas formation was confirmed by the volumetric water content measurements and by a decrease in pressure wave velocity in cross-hole seismic measurements. The results provided valuable lessons for future field applications of MIDP as ground improvement method.
Soil stabilization with microbially induced desaturation and precipitation (MIDP) by denitrification: a field study
Acta Geotech.
Zeng, Chen (author) / Van Paassen, Leon A (author) / Zheng, Jun-jie (author) / Stallings Young, Elizabeth G (author) / Hall, Caitlyn A (author) / Veenis, Yvo (author) / Van der Star, Wouter R. L. (author) / Konstantinou, Maria (author) / Kavazanjian, Edward (author)
Acta Geotechnica ; 17 ; 5359-5374
2022-12-01
16 pages
Article (Journal)
Electronic Resource
English
Biogenic gas , Bio-mediated soil stabilization , Desaturation , Field study , Microbially induced desaturation and precipitation (MIDP) , Nitrate reduction Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
MIDP: Liquefaction Mitigation via Microbial Denitrification as a Two-Stage Process. I: Desaturation
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