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Established over 25 years ago, WPL is recognised as an international leader in engineering design, manufacture and supply of packaged wastewater treatment process solutions. Offering standardised products and bespoke process solutions for the cost-effective, on-site treatment of wastewater treatment, WPL has delivered on-site process solutions to the domestic, commercial and industrial markets globally. WPL ensure that wastewater treatment plants are designed and proven to exceed all current or proposed discharge consent standards enforced by the UK Environment Agency, SEPA or other regulatory bodies, the directors, managers and staff are committed to ensuring adherence to the following: ISO 9001 certification; OSAS 18001:2007 certification and ISO 14001 certification.


Miss Lianne Ayling
Units 1 Aston Road



Mott MacDonald Bentley hires a hybrid packaged sewage treatment plant for Carlton Husthwaite wastewater treatment works. The hire plant consists of the new WPL Hybrid SAF tank (made from GRP and steel exoskeleton) and humus final settlement tank for the Yorkshire Water AMP 6 project.

The 170 population equivalent site has retained the primary settlement tank, and the hire plant replaces the original Rotating Biological Contactor (RBC) until the permanent WPL HiPAF  (below ground) solution is installed in Q3.

Andrew Haywood, Utility and Industrial Sales Manager states "WPL provided a solution to allow the existing RBC to be taken offline whilst maintaining treatment. We have worked close with Mott McDonald Bentley to provide a permanent solution designed strictly in accordance with the Yorkshire Water SAF specification.”

The permanent bespoke HiPAF will consist of a SAF and filter humus (section) packaged treatment plant to work with the current primary settlement tank.

The bespoke WPL HiPAF Features include:

  • Mk.3 lids with high level safety grids throughout the plant which provides superior access to all parts of the units for maintenance, enhanced operation and safety.
  • Stainless steel internal aeration pipework.
  • Fixed drain down facility with bauer connector.
  • Process design accordance with the Yorkshire Water SAF specification.
  • Acoustic lined GRP XL Kiosk complete with vent fan and cowl to house the energy efficient duty stand-by air blowers and manifold.

Site Effluent Discharge Standard (95%ile based on spot samples):

  •  BOD5 (ATU) - Descriptive
  • Suspended Solids - Descriptive
  • Ammonia - Descriptive



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