Constant Velocity Grit Channels The whole of the presedimentation or inlet works is fully enclosed and incorporates 6 large automatically raked mechanical screens followed by constant velocity grit channels which are cleaned by a travelling suction dredger. Maximum flows through this section of the plant can be 6 DWF.
Primary Sedimentation Tanks A total of 12 rectangular primary sedimentation tanks are installed, each of which has a travelling mechanical scraper mechanism. The capacity of these tanks provides a 6 hour retention at the DWF of 2.53m^3/sec.
Mammoth rotor Aeration Tanks Secondary treatment of sewage flows is provided in an activated sludge plant in the form of 6 rectangular aeration tanks which provide 5.5 hours retention at the design DWF. A total of 24 Biwater horizontal Mammoth rotors are installed in the aeration tanks to provide the required oxygen transfer and mixing necessary for the efficient operation of the process.
In 2000, at a cost of £65million, Scottish Water had built a plant at Daldowie, near Glasgow, to process half of Scotland's sewage into fuel pellets. These are used as a coal substitute by the giant Longannet power station in Fife to produce enough "carbon-neutral" electricity to power 30,000 homes.
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