WPL Hybrid-SAF | Reshaping Biological Performance

WPL’s submerged biological treatment technology fits more process capacity inside each WPL Hybrid-SAF vessel. This not only brings down energy use per m³ treated, it also brings down the site footprint required.

The process technology is designed to meet on site specification and high treatment standards for biochemical oxygen demand (BOD), ammonium (NH4), and soluble chemical oxygen demand (COD).

Developments in hydraulic control and retention times have also enabled WPL’s process technology to consistently achieve final effluent Ammonia concentrations of less than 1 mg/l on a 95%ile basis, for a more robust process.

Additional equipment can be added to remove phosphorus (P). The process can also be configured to provide anoxic conditions for nitrate (NO3) removal.

 

Flexibility of design

The flexibility of the modular design means units can be designed to an unusual footprint shape and installed even where site access face height and width constraints. In certain circumstances, WPL can increase the height or width of individual units at the design stage to accommodate site constraints.

Built off site, the modular units are simple to transport and install, reducing on-site installation time, which in-turn reduces health as safety risk. Units can be redeployed elsewhere if an existing installation becomes redundant before the end of its life.

Manufacture

The modular WPL Hybrid-SAF vessels are manufactured from UV stabilised GRP and galvanised steel (or stainless steel) structural ‘exoskeleton’, with WPL’s submerged biological treatment technology inside.

 

Why you should choose the WPL Hybrid-SAF:

Flexible modular design

  • Designed to fit sites with a small or unusual footprint
  • Scalable to accommodate a growing population of up to 10,000 population equivalent (PE)
  • Transportable asset during site modification
  • Can redeploy elsewhere if an existing installation becomes redundant before the end of its life
  • Modular units can operate as an individual treatment plant or be designed to be connected in series to form a larger plant

Reduces civil installation time

  • Off-site tank manufacture reduces on-site installation time and health and safety risk
  • Modularity allows ease of transportation and accommodates unusual height or width restrictive access
  • Can be delivered and off-loaded by a lorry crane (Hiab), removing the need for large lifting equipment
  • Control kiosks with blowers, panels and optional telemetry equipment are also pre-built to reduce on-site installation

Engineering design

  • Can be combined with both upstream and downstream treatment equipment
  • Option of allowing blowers to be driven by variable speed drives (VSD’s), controlled by dissolved oxygen (DO) and/or ammonia monitors. This delivers further reductions in energy consumption; reducing overall carbon footprints and running costs

Low operator maintenance

  • No need for high level access for internal maintenance
  • No need to drain the tanks or remove the media
  • No internal moving parts or maintenance required within the tank

Compliant

  • Meets stringent environmental discharge standards
  • Fully compliant WIMES specification, British Standards and other European Norms
  • Designed to meet individual UK water utility specifications
  • Designed to BS12255 – parts 1 to 15

Continuous research and development

  • WPL’s submerged biological treatment technology (patent pending) fits more process capacity inside each WwTW vessel – new and existing
  • This not only brings down energy use per m³ treated, it also brings down the site footprint required
  • Developments in hydraulic control and retention times have also enabled WPL’s process technology to consistently achieve final effluent Ammonia concentrations of less than 1 mg/l on a 95%ile basis.
  • Modular design of the Hybrid-SAF vessel(s) combined with WPL’s submerged biological treatment process technology (inside) have significantly improved flexibility of design (site layout), energy optimisation, reduction in footprint size and ease of access to height and width restricted sites.

Manufacture

  • Manufactured, engineered and wet tested in WPL’s quality controlled factory
  • Modular vessels are a combination of UV stabilised GRP with an external gel coat finish and galvanised steel or stainless steel structural ‘exoskeleton’ – design life of 25 years
  • Standard unit size (UK) is 2820mm (l) x 2820mm (w) x 3300mm (h)

Technical specification

For technical specification information (including indicative drawing), please download  the WPL Hybrid-SAF datasheet (available on this page).


Case study: at a glance

Image of WPL Technical Director, Andrew Baird at Sandbach site

United Utilities (UU) Wastewater Treatment Works – Sandbach in Cheshire and Lawton Gate in Staffordshire.

Each of the two site installations was delivered and offloaded over two days and was set up and commissioned within five days.

Read full case study Modular treatment plant delivers flexible upgrade for United Utilites