WPL SAF – steel or stainless steel tanks

Submerged aerated filtration (SAF) for wastewater treatment

The WPL SAF  (manufactured in steel or stainless steel) combines submerged aerated filter technology with the latest research to mitigate the risk of compliance failures. Process flexibility makes the the modular plant suitable for a range of applications from sewage to industrial wastewater treatment, in order to reduce biological contaminants, such as biochemical oxygen demand (BOD) and ammonium (NH4) where required.

Our plants have a proven track record of over 25 years in utilising submerged aerated filtration for wastewater treatment; compliant with WIMES, specific water utility asset standards, CDM regulations, European norms and directives.

WPL SAF’s are regularly specified by the highly regulated UK water utilities and commercial applications for permanent, transportable and hire options.

 

Why you should choose a WPL SAF:

Flexible design

  • Scalable – The modular units can operate as an individual treatment plant or be designed to connect in series to form a larger plant.
  • Transportable – Can be used as a moveable asset during site refurbishment, if a site faces compliance issues and used elsewhere if an existing installation becomes redundant before the end of its life. This prevents premature scrappage and reduces waste.

huyton-wpl-submerged-aerated-filter-SAF-package-sewage-treatment-plant-top-view

Engineering design

  • Robust process – Designed to meet on site specification and high treatment standards for biochemical oxygen demand (BOD), ammonium (NH4) and soluble chemical oxygen demand (COD).  Additional equipment can be added to remove phosphorus  (P). The process can also be configured to provide anoxic conditions for nitrate (NO3) removal
  • Process – The modular design can be combined with both upstream and downstream treatment equipment based on individual process requirements.
  • Running costs – Option of allowing blowers to be driven by variable speed drives (VSD’s), controlled by dissolved oxygen (DO) and/or ammonia monitors, delivering further reductions in energy consumption and reducing overall carbon footprint and running costs
  • BIM – Modular construction and configuration can meet site-specific requirements incorporating BIM workflow principle
  • Compliant – All WPL SAF units meet WIMES, specific water utility asset standards, CDM regulations, European norms and directives

Bespoke design options based on site challenges

  • Ease of access – Design options for ease of transportation and accommodates unusual height or width restrictive site access
  • Footprint – Designs can cater for unusual or small footprint

wpl-n-saf-submerged-aerated-filter-wastewater-treatment-plant-installed-at-danesmoor-watewater-treatment-works-united-utilities

Maintenance

  • Supplied with or without high level access for internal maintenance
  • No need to de-sludge the tanks or remove the media, minimising maintenance
  •  No internal moving parts or maintenance required within the tank
  • Running costs – option of allowing blowers to be driven by variable speed drives (VSD’s), controlled by dissolved oxygen (DO) and/or ammonia monitors, delivering further reductions in energy consumption and reducing overall carbon footprint and running costs

Continued research and development

  • Research has proved that the unique hydrodynamics retains process fluids, in excess of the hydraulic retention time (HRT)
  • Over 25 years of process developments has led to the evolution of the WPL SAF process into the hybrid variant

Manufacture

  • Manufactured in steel or stainless steel at WPL’s quality controlled factory environment, reducing on-site installation time which further reduces health and safety risk
  • Control kiosks – blowers and panels equipment are also pre-built  to reduce on-site installation. Additional option of telemetry if required
  • 25 years asset life

Standard WPL SAF specification information

Units can be bespoke manufactured on request

Technical specification table of the WPL submerged aerated filter (SAF) options manufactured in steel and stainless steel for sewage and industrial effluent biological treatment fo

Indicative technical drawing

Technical drawing of a WPL steel submerged aerated filter (SAF) wastewater treatment tank for sewage or industrial effluent wastewater treatment


Huyton WwTW case study: at a glance

Working closely with contractor Nomenca, a total of five modular transportable Submerged Aerated Filter (SAF) units were purchased from WPL and installed to meet the 5Ml/day flow through at Huyton WwTW.

The temporary nature of this application, plus similar challenges across the utility’s asset base, led to United Utilities’ requirement that it should be possible to relocate the SAFs elsewhere within the region on completion of the project.

Huyton-final-installation-of-wpl-transportable-packaged-sewage-treatment-plant

Read full Huyton WwTw case study here.


Danesmoor WwTw case study: at a glance

Eight modular tanks manufactured from steel, as per the specification for Danesmoor WwTw, which were assembled off-site in the factory.

The units had to then be taken apart for transportation to avoid overhead electric cables and to fit down narrow country lanes.

The tanks when on-site had to be lifted, rotated and placed onto a prepared concrete slab.

This process solution of a factory ‘kit’ build meant that less workers were required at Yorkshire Water’s site, in turn minimising the risk of health and safety and quality control.