The wastewater treatment plant processes around 330 000 cubic meters of municipal wastewater, coming from three surrounding urban agglomerations. Dewatered sludge is burned in the incinerator.
Off-gases are siphoned through an electrostatic precipitator for dust collecting, in order to meet regulatory requirements. However, somme sampling campaigns have shown overshoots, some for particulate matter (PM), others for hydrochloric acid gas (HCl).
STS Canada was to determine which best available control technology (BACT) was better suited to collect PM and HCl, both at the same time and at the lowest cost possible.
STS Canada used its internal research and screening tools to detemine the BACT best suited for this issue. Amongst other steps, the analysis of available technologies was coupled with an evaluation grid, which included, but was not limited to, factors like APEX/CAPEX, maintenance and training requirements, operations, integration feasibility, etc.
The process singled out the "Ring Jet Scrubber" technology. This process unit is a multistage wet scrubber that includes preconditioning of gases and several gas and element scrubbing steps.