Study on the regulation effect of biochar on the engineering properties of domestic sources contaminated soil

Domestic sources contaminated soil exhibits low strength and high carbon emissions, while biochar offers potential advantages for low-carbon green reinforcement. This study simulated the reinforcement treatment of domestic sources contaminated soil using biochar by remodeling biochar-added contaminated clay. It revealed that the adding biochar to domestic source contaminated clay significantly affecting its physicochemical and engineering properties. When the particle size of biochar is 1-3 mm and the dosage is 12%, a better comprehensive treatment effect can be achieved. The soil pH increased from 6.4 to 7.5, the cohesion increased from 23.57 kPa to 47.02 kPa, and internal friction angle increased from 0.45° to 5.04°. Meanwhile, the compression coefficient and permeability coefficient remained at low levels. In conclusion, the research results preliminarily confirmed the feasibility of using biochar for reinforcement of domestic sources contaminated soil.