Abstract:To control coastal wind erosion and explore feasible and efficient new technologies for coastal windbreaks and sand fixation, this study developed the Enzyme-Induced Calcium Carbonate Precipitation (EICP) sand stabilization technique. The technique used concentrated seawater as a soluble calcium salt solution and discarded soybean husks as a source of enzyme urease. Wind erosion tests on stabilized sand were conducted, and the effects of urease activity, spray volume of the reaction fluid, number of treatments, curing time, and seawater salinity on stabilization efficacy were analyzed. Results indicated that the activity of urease from soybean skin increased with rising temperatures within the range of 10-65°C and also increased with the amount of soybean skin used. Centrifugation time and speed during urease extraction had no significant effect on urease activity. Samples solidified with soybean skin and seawater demonstrated effective windbreak and sand fixation. When urease activity was fixed, an increased number of treatments, spray volume, and curing time enhanced surface penetration strength, though the effect gradually diminished beyond a certain threshold. With the same total volume of reaction fluid, multiple incremental treatments resulted in higher carbonate precipitation rates, higher threshold wind velocities, and better wind erosion resistance compared to a single centralized treatment. For optimal wind-erosion resistance, the concentration of concentrated seawater should not be lower than 0.6 mmol/L, and the curing time should not exceed 12 hours.