Waste Water Treatment in Scotland

Dalmarnock

Dalmarnock

• Opened in 1894

• Processed sewage dried and pressed

• Initially the processed sewage was sold as Globe fertiliser

• Laterally a pipeline was built connecting Dalmarnock to Shieldhall.

Dalmuir

Dalmuir

• Opened in 1904

• Sewage also dried and pressed

• Dumped at Sea off the tip of the Isle of Bute

• Site downstream allowed easier access for sewage ships

Shieldhall

Shieldhall

• Opened in 1910

• Also followed model at Dalmarnock

• Built as the main sewage works for Glasgow

• Rebuilt in 1980 to process sewage from surrounding areas

Shieldhall

Shieldhall

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.

Shieldhall

Shieldhall

Primary Sedimentation

TanksA 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.

Shieldhall

Shieldhall

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.

Daldowie

Daldowie

• 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.