SEL Source Control System Overview - Attenuation
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Treatment Stages 1 & 2 - SEL Permachannel®
Treatment at source SEL Permachannel® silt/oil separator to PPG3 levels. Phase 1 treatment – oil separation to meet the criteria set out in PPG3. Phase 2 treatment – silt deposition using low velocity (micro catchment) gravity separation.More details >Treatment Stage 3 - SEL Permafilter® Biomat
Phase 3 treatment - removal and degradation of residual hydrocarbon by use of floating Permafilter Biomat®.
More details >Treatment Stage 4 - SEL Permavoid®
Phase 4 treatment – shallow attenuation providing effective dilution and dispersal using large surface area.
More details >Treatment Stage 5 - Flow Control Sump Chamber
Phase 5 treatment - simple, shallow low head flow control for effective settlement of silt. Easy access facilitates simple inspection, monitoring and maintenance.
More details >Treatment Stage 6 - SEL Permaceptor®
Phase 6 treatment - Final polish for sensitive applications on high risk sites (e.g. protected aquifers). Also intercepts and contains hydrocarbons for subsequent removal and disposal where there is a high risk of a catastrophic spillage (e.g. refuelling areas or household recycling centres).
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Encapsulation for attenuation systems