Case studies

Air and biosparging

Case studies

Air sparging to remediate dissolved phase benzene at a former gasworks and naphtha crude oil gasification site

For this project, RemedX was commissioned by SecondSite Properties (now part of National Grid) to clean up a five-hectare site in Croydon that previously contained gasworks and naphtha crude oil gasification plants. The project is notable for the fact that RemedX designed and installed arguably the UK’s largest ever airsparging system, which was combined with soil vapour extraction (SVE).

The remediation system operated for a period of eight months in which the objective of 80% reduction in groundwater of dissolved phase concentrations of benzene and petroleum hydrocarbons was achieved to the agreed timescale, together with an asymptotic cumulative total contaminant mass removal/destruction estimate.