Treatment of Cr(VI) and CHC Groundwater Contamination under a Residential Development

In situ remediation of hexavalent chromium (VI) and chlorinated solvents using combined anaerobic biodegradation and immobilisation in Northampton, UK

Background

On the site of a former chrome plating works, construction and inhabitation had begun on a new residential development. Hexavalent chromium (Cr(VI)) and some chlorinated hydrocarbon compounds (CHCs) had been discovered in the groundwater beneath the development. It was determined by the environmental consultant that the Cr(VI) was driving a risk on the site. The housebuilder required rapid achievement of site targets in order to continue the development of the site.

Case Study Highlights

• REGENESIS provided an accurate and pragmatic design approach for the busy residential construction site
• Full-scale remediation was completed comprising a of a series of rows, totalling 78 injection points, to fit in between the residential properties and services
• A mixed plume of CHCs and Cr(VI) was treated concurrently using a combination of complementary substrates
• The works were completed rapidly with minimal disruption to the construction project and existing residents
• The use of barriers, targeting hotspots and pathways provided a cost-effective and efficient treatment of the plume
• Remediation Cost and Result Graph included

2m 40s reading time

Remediation Products Applied

A combination of ERD and in situ immobilisation using 3-D Microemulsion (3DME) and Metals Remediation Compound (MRC) has been used to primarily to treat the Cr(VI) contamination.