A multi-phase biogeochemical model for mitigating earthquake-induced liquefaction via microbially induced desaturation and calcium carbonate precipitation

Abstract. A next-generation biogeochemical model was developed to explore the impact of native water source on microbially induced desaturation and precipitation (MIDP) via denitrification. MIDP is a non-disruptive, nature-based ground improvement technique that offers promise cost-effective mitigation earthquake-induced soil liquefaction under adjacent existing structures. leverages bacteria reduce potential for triggering in short term through biogenic gas generation (treatment completed within hours days) over longer calcium carbonate weeks months). This expands earlier modeling consider multi-phase speciation, bacterial competition, inhibition, precipitation. The used varying treatment recipes products by-products natural seawater environment. case study presented herein demonstrates importance optimizing minimize unwanted (e.g., H2S production) or incomplete denitrification nitrate nitrite accumulation).