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  Mass transfer modelling of hydrogen sulphide (H2S) generated in London Tideway Tunnels (LTT): A new methodology for odour and ventilation system design

  The LTT aims to capture flows from combined sewer overflows (CSOs) which presently discharge combined sewage over 50 times in a typical year into the tidal Thames. When the LTT fills, the displaced air is treated and exhausted via ventilation stacks located at the shafts to the tunnels. The incoming sewage contains sulphides, which is transferred from the liquid to the gas phase generating H2S by stripping at drop shafts or turbulence of the water within the shafts and tunnel. Untreated air releases could be a source of odour nuisance and complaint. Odour concerns are managed by active and passive air treatment units (ATUs) at tunnel shafts. The air management system designed achieves over 99.5% treatment of typical year exhausts.

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