Feasibility of Remediation Lead, Nickel, Zinc, Copper, and Cadmium-Contaminated Groundwater by Calcium Sulfide

Metal contamination in groundwater often occurs various industrial processes. Studies have confirmed that polysulfide could reduce hexavalent chromium to trivalent chromium, achieving the effect of situ stabilization. For other metal groundwater, whether also had a stabilizing ability achieve remediation. This research focused on metals addition contaminated including lead, nickel, zinc, copper, and cadmium, explore feasibility using calcium (CaSx) as an stabilization technology for these metals’ groundwater. Results showed CaSx great removal efficiency cadmium. However, when was added excessively, complexes would be formed, causing result re-dissolution, turn reducing efficiency. As it is difficult accurately control dosage agents remediation, concentration re-dissolved cadmium may not able meet standards. high lead 100 mg/L, dose more than amount 1/1200 (volume ratio groundwater). In addition, rate almost 100% cause re-dissolution due excessive dosing. can used technique lead-contaminated