Advances in Water Treatment and Enviromental Management
Advances in Water Treatment and Enviromental Management
Advances in Water Treatment and Enviromental Management
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260 WATER TREATMENT7.1 Efficiency of a Storm K<strong>in</strong>g OverflowThe efficiency of a SKO can be looked at <strong>in</strong> two ways—<strong>in</strong> chemical terms<strong>and</strong> aesthetic terms. Chemical efficiency means the ability of the device toremove common pollutants such as suspended solids (SS), biochemicaloxygen dem<strong>and</strong> (BOD) <strong>and</strong> ammoniacal nitrogen (AmmN) from the flowbefore discharge to the stream. Aesthetic efficiency can be def<strong>in</strong>ed as theability of the device to remove neutrally buoyant sewage solids from theflow before discharge; these solids could be regarded by the public as caus<strong>in</strong>ga nuisance <strong>in</strong> the receiv<strong>in</strong>g stream <strong>and</strong> therefore, the device could be regardedas fail<strong>in</strong>g the “telephone test” (3)The SKO chosen for this study is located <strong>in</strong> Fig 2. <strong>and</strong> the layout of the<strong>in</strong>stallation is shown <strong>in</strong> Fig 3.FIG. 3Two automatic sampl<strong>in</strong>g devices (Dalog mach<strong>in</strong>es) have been fitted to theSKO, see Fig 3—one on the <strong>in</strong>let <strong>and</strong> one on the outlet. These samplers areactivated by the <strong>in</strong>com<strong>in</strong>g <strong>and</strong> outgo<strong>in</strong>g flow <strong>and</strong> take composite samples ofthe storm water. Therefore, by compar<strong>in</strong>g the quality of <strong>in</strong>let <strong>and</strong> outletsamples <strong>and</strong> tak<strong>in</strong>g <strong>in</strong>to account the ratio of flow splitt<strong>in</strong>g <strong>in</strong> the device, a
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