Factors Controlling MIDP via denitrification

What is it about?

Denitrification offers the potential for cost-effective mitigation of earthquake-induced soil liquefaction beneath existing facilities. Previous investigations of denitrification for mitigation of liquefaction employed semi-stagnant columns. These experiments investigated the effects of nitrate loading rate and input concentrations of calcium and acetate on microbial denitrification in a cohesionless soil subject to continuous flow..

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Why is it important?

Low nitrate-loading rates (i.e., ≤0.7 mol/m2-day) generally led to favorable outcomes (i.e., less accumulation of intermediates and more efficient carbonate precipitation). Faster precipitation rates associated with low nitrate-loading rates led to smaller carbonate crystals and a less uniform precipitation pattern (i.e., precipitation focused near the nutrient source). The results support that lower nitrate loading rates can be beneficial for MIDP although higher nitrate loading rates might be useful for some soil improvement applications.