Environmental investigation of bio-modification of steel slag through microbially induced carbonate precipitation

Steel slag (SS) is one of byproduct steel manufacture industry. The environmental concerns SS may limit their re-use in different applications. goal this study was to investigate the leaching behavior metals from before and after treated by microbially induced carbonate precipitation (MICP). Toxicity characteristic procedure, synthetic procedure water tests were performed evaluate major elements (Fe, Mg Ca) trace (Ba, Cu Mn) three scenarios. concentrations increased with content SS. After it reached peak concentration, concentration decreased leachability all concerned below 0.5%. generated MICP process contributed low metals. bio-modified process, Ba TCLP, SPLP WLT 2.0 mg/L, which drinking regulated U.S. EPA. leached out MICP-treated SS-sand samples 1.3 mg/L national secondary water. Compared regulations U.S.EPA Mississippi Department Environment Quality (MDEQ), classified as non-hazardous materials respects Meanwhile, maximum contaminant limits states that are eco-friendly can be reused construction materials.