Ex-situ soil bioremediation on a development site in Bedfordshire
Client: Investment bank
Contract period: 26 weeks
This extensive redevelopment site was heavily contaminated with oil hydrocarbons due to past industrial activity. Bioremediation was identified as a cost effective and environmentally friendly solution. Specialist bioremediation company Telluric Land Remediation acted as Principal Contractor and was responsible for the excavation, bioremediation and reinstatement of treated materials. Approximately 5,000 m3 of contaminated materials with an average TPH (C5 - C35) concentration of 20,100 mg/kg were excavated to a depth of up to 8.0 m.
The contaminated soils were formed into treatment beds which were lined with an impermeable membrane to provide protection of underlying ground. Nutrients were blended into the soil and the treatment beds were rotovated on a regulor basis. Following rotovation, the beds were re-covered with high strength plastic sheeting, which provided protection from adverse weather and containment of odours.
The remediation targets, previously agreed with the Environment Agency, were reached after six months of treatment. Ex-situ bioremediation provided our Client with a very economic and practical solution and allowing this former heavily contaminated industrial site to be redeveloped for residential housing.
- Design of the treatment solution
- Negotiations with the Environment Agency regarding licensing issues and validation
- Excavation, separation and stockpiling of clean materials
- Ex-situ bioremediation of 5000m3 of contaminated soil
- Backfill excavation with treated soil
- Soil sampling and reporting
- Environmental monitoring
Ex-situ bioremediation provided our Client with a very economic and practical solution and will allow this former heavily contaminated industrial site to be redeveloped for residential housing.
A pdf version of this ex-situ soil bioremediation case study is available here.