INSIMEP - In Situ Metal Precipitation for remediation of groundwater contaminated with non ferrous metals
Currently, the best available remediation technique for groundwater contaminated by non-ferrous metals is to pump it up and clean it in wastewater treatment plants â€“ i.e. â€˜pump and treatâ€™ (P&T), which is a long and costly operation, often failing to meet cleanliness standards. The project aimed to show that treating metal-contaminated groundwater onsite, by accelerating naturally-occurring biogeochemical processes (through the in-situ metal precipitation INSIMEP method), is a better solution than current techniques. The project focused on demonstrating the method at two of the beneficiaryâ€™s sites each with varying contaminant mixtures and hydrogeological conditions. The project successfully demonstrated that the in-situ method resulted in the precipitation of metals to a level below remediation targets and achieved irreversibility of metal precipitates. Among the advantages of the method: no hazardous chemicals are required, no solid waste is produced, energy use is lower and long term economic feasibility.