A COMPARATIVE STUDY ON STABILIZATION REAGENTS FOR LEAD CONTAMINATED SOIL

Stabilization technology has been used commonly in remediating lead contaminated site，as its low cost，excellent efficiency and low secondary pollution risk． In this study，three remediation reagents for lead stabilization，reagent A to form phosphate precipitation，reagent B to form sulfide precipitation，and reagent C to form stable chelate complex with lead ion， have been compared and studied，respectively． According to the results，reagent A has better effect for Pb stabilization． For treating lead contaminated soil with leaching concentration within 20 mg /L and around 90 mg /L，suggested addition ratio could be 8% and 13%，respectively． Based on the project experiences from BCEG Environmental Remediation Co． ，Ltd，the recommended addition ratios were 10% and 15% respectively for guaranteeing engineering quality． The results could provide references for the later application of stabilization technology for lead contaminated soil．