George Leslie Ltd
Bonnybridge WWTW

Key Facts

  • Client: Scottish Water Solutions
  • Contract value: £5,800,000
  • Duration of works: March 2003 – April 2004

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Wastewater Treatment Works

Bonnybridge WWTW

The project involved a major upgrading of the wastewater treatment facilities at Bonnybridge in central Scotland to improve the discharge into the River Carron and was delivered by the Purac Leslie Consortium, who undertook the project development, detailed design, construction and commissioning of the new works.

Main elements of the new works included:

  • 2nr 37m x 26m x 5m high Inclined Bubble Aeration Tanks
  • 2nr 24m diam Final Settling Tanks
  • Tertiary treatment sand filter plant
  • Miscellaneous chambers and pumping stations
  • Thickened Sludge and Sludge Holding Tanks
  • Service Water Tanks
  • Interconnecting pipework and outfalls
  • MCC, power, lighting, telemetry and automated instrumentation controls

The new construction was undertaken “off-line” on a greenfield site thus enabling the continuing operation of the existing, adjacent works throughout the period of construction. The design incorporated many of the features of the existing works – the inlet chamber, buildings and access routes – which were modified and incorporated within the new scheme yielding project cost savings.

A comprehensive upgrading of the infrastructure was also undertaken, covering the power, telephone, and fresh water supplies. Surfaced access ways, lighting, security fencing, steel access walkways and final landscaping completed the overall picture. The new facility which was commissioned on programme and to budget, was officially opened by local Member of Parliament Dennis Canavan, accompanied by the chairman of Scottish Water, on 7th April 2004.

News updates


The overall project involves the off-site fabrication and installation of a new linkspan structure at Oban Ferry Terminal for client Caledonian Maritime Assets Ltd (CMal).

12th February 2019

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GL return to the Sound of Kerrera

GL making a return visit to the Sound of Kerrera off Oban, to undertake substantial repairs to the breakwater which suffered collision damage following an altercation with a workboat earlier this year.

14th December 2018

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Polmadie Bridge official opening……..

Michael Matheson MSP and Cabinet Secretary for Transport, Infrastructure and Connectivity covered all his portfolios at the official opening of the new Polmadie Footbridge giving pedestrian and cycle transport access,

18th September 2018

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George Leslie Ltd, Blackbyres Road, Barrhead, Glasgow, G78 1DU  |  |  +44 (0)141 881 9131