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Wessex Water: Westbury WwTW

Westbury WwTW Refurbishment / Technology Update

Customer Scope

Refurbishment of Westbury WwTW to ensure compliance with regulatory changes, including the tightening of the ammonia permit to improve the quality of fresh waters, as well as providing increased capacity for local population growth and business expansion.

Replacement of MBR technology with an ASP activated sludge process which treats sewage and industrial wastewaters using aeration and a biological-bacterial floc.

GPS Scope:

Design, manufacture and test of…

  • Mains Distribution Board with ICA – 5.6 m
  • Inlet MCC – 5.9 m
  • ASP MCC – 14 m 
  • Recirculation MCC – 10.3 m
  • LCP x 4
  • Duration 28 weeks
  • Industry Sector Regulated Water
  • Contract Circa £450,000
  • Completion April 2019
  • Westbury WwTW
  • Westbury WwTW
  • Westbury WwTW

Westbury WwTW.


Project Delivery / Outcome

GPS delivered 36 metres of LV assemblies on time and budget.

To meet the tight timescales, a staggered approach saw initial design commence in October 2018, continuing through to February 2019, with an overlapping build schedule from November 2018 through to March 2019, and a phased installation programme. 


  • Design: G-Flex C, front access, bottom cable entry
  • MCC Metres: 36 m
  • Separation: Form 4
  • IP rating: IP 54
  • Current rating(s): 469A - 844A - 1312A
  • Fault rating(s): 20 kA/1 Sec - 50 kA/1 Sec
  • PLC system: Siemens
  • Communications: Profibus


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