Nigg Bay Project Summary
Kelda Water Services Grampian (KWS Grampian) has a 28 year design, build, finance and operate contract with Scottish Water to operate and maintain four wastewater treatment plants serving the north east of Scotland; two sites in Aberdeen (Nigg and Persley) and two sites to the north (Peterhead and Fraserburgh). In addition to
treating wastewater, KWS Grampian operate sludge treatment facilities able to receive imported sludge and liquid wastes.
Challenge & Solution
Grampian and providing a control philosophy for maintaining the required dry solids concentration of the sludge cake product as part of the PLC control. As it was absolutely essential that such a major asset should have minimal downtime during the install.
The 2 (No.) Volute units operate at a range of 35-70m3/hour (duty/ standby or duty/assist). The Nigg Sludge Treatment Centre treats the equivalent of 300,000m3 and 400,000m3 of sludge per annum, equivalent to the processing of between 8,000 and 10,000T of dry solids. As expected solids capture is excellent at around 98%, which usually results in a filtrate containing around 600mg/l of suspended solids