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Off-Gas Treatment
Several of the physical ground remediation processes, such as soil vapour extraction (SVE) and air sparging can result in the generation of concentrated vapours, which require treatment. We generally use the following methods of off-gas treatment.
Activated carbon
Granular activated carbon has the ability to remove a wide range of contaminants from the gaseous phase. We generally use this technology for off-gas treatment on remediation sites with low to medium concentrations of off-gas and on relatively short term contracts.
Biotreatment
TLRL use air biofilters on longer term projects where the off-gases are readily degradable (e.g. petroleum hydrocarbons). These biofilters require careful monitoring for moisture content and other parameters for optimum efficiency. A larger footprint is generally required for the plant than activated carbon vessels.
Catalytic oxidation
Catalytic oxidation systems may be a cost effective treatment technology in the event that contaminant concentrations are high, which would lead to high consumption of activated carbon. We can offer a cost/benefit analysis between the use of catalytic oxidisers and other forms of vapour treatment such as activated carbon.
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