Bio-Grout Based Soil Improvement-PPT Presentation

PPT Presentation

Pdf Summary

The presentation describes bio-grouting as a minimally invasive method for improving soil, using biologically produced carbonate to form calcium carbonate bonds within the ground. The process feeds microorganisms with carbamide, grows them in bioreactors, produces a stable, nitrogen-free carbonate solution, and injects it on site, where it reacts with calcium to cement the soil.<br /><br />Bio-grout may help address demand for ground stabilization and foundation repair while avoiding several impacts associated with conventional grouts, including emissions, permanent pH changes, residual pollution, vibration, ground heave, spoil, and reduced permeability. Its low viscosity allows injection at low pressures through conventional equipment and small-diameter tubes, often without drilling. The treatment aims to strengthen soil while retaining permeability.<br /><br />The presentation identifies key challenges for microbial-induced calcite precipitation (MICP): managing residual nitrogen, scaling up to construction-sized volumes, achieving economic viability, and meeting certification requirements. The proposed approach addresses nitrogen by separating it from the carbonate-rich solution and recovering it as fertilizer.<br /><br />Reported applications include sandstone cliff stabilization and a 200 m³ sand-pit trial. The presentation reports zero-waste production and application, 55% lower CO₂ emissions, and certifications including ISO 9001, ISO 14006, ISO 45001, and CEN/TR 17105. It concludes that bio-grouting could become an important geotechnical technology as it develops toward standardized, economical, and sustainable applications.

Keywords

bio-grouting

soil stabilization

microbial-induced calcite precipitation

calcium carbonate

ground improvement

sustainable geotechnical technology

foundation repair

low-emission grouting

nitrogen recovery

bioreactor production