Nigg Bay Waste Water Treatment Facility

The first UK wastewater Volute Dewatering Press instillation

Industrial Sludge Dewatering Processes

Nigg Bay was the first UK wastewater Volute Dewatering Press instillation, installed on the north east coast of Scotland near Aberdeen. This is significantly large installation as the PE of the works serves 250,000 people, therefore the sludge dewatering technology needs to be able to process large enough volumes and be reliable for future demands.

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.

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  • Construction date: September 2016
  • Customer: Scottish Water
  • Location: North East Scotland

The Volute Dewatering press was selected to be the best solution, when comparing whole life CAPEX costs against existing technologies on the market.

What was innovative for Williamsgate was that it was the first permanent installation in the UK on drinking water sludges.

This decision was based on years worth of pilot plant trials on a range of clean water sludge types. What was discovered was that the Volute is particularly good at dewatering drinking water sludges, which are known to be particularly difficult to dewater.

This is due to the low fiber content, leading to a reduction in compressibility. However due to the Volute design and control philosophy with the flocculation tank and screw, the solids loading can be modulated to suit the sludge type and cake target.

Learn more about How Evergreen Delivered Results That Work...

View Nigg Bay Case Study

The Complex Challenge and Our Leading Solution

The order placed with Evergreen Water Solutions was for the design, manufacture, testing, inspection, delivery, commissioning, training and handover of 2 (No.) Amcon Europe ES354 Volute dewatering presses.

This included the provision of mixing and flocculation tanks and any necessary modifications to both the feed and reject pipework and the cake discharge arrangement to suit the existing cake pumps.

Evergreen Water Solutions were also responsible for ensuring that their PLC system was compatible with that of KWS 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

  • Excellent example of how Volutes can be retrofitted
  • 24/ 7 continuous operation
  • Low energy and low maintenance
  • Proven track record and reliability
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Evergreen Water Solutions

Whether you are a municipal or industrial client requiring help and support on your water or wastewater plant or a new build project, don’t hesitate to contact the Evergreen water treatment experts.

From municipal wastewater treatment plant designs to commissioning an industrial water purification system, we are here to help.

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