HiPAF wastewater treatment plant

HiPAF® for the water utilities and properties up to 5,000 population equivalent (PE)

The HiPAF packaged treatment plant includes a three-stage process – primary settlement, biological treatment (biozone) and final settlement. The segmented biozone process chambers eliminate the risk of process short-cuts and mitigates risks associated with variable loads.

Image: Above and below ground HiPAF treatment packaged treatment plant

Why choose the HiPAF solution:

Low maintenance

  • No internal mechanical or electrical moving parts within the tank
  • Emptying of the tank not required during maintenance – simply isolate and remove sections of the air distribution system
  • Large access lids therefore no requirement for confined space entry
  • Significant reduction in power consumption using VSD’s, timers, instrumentation and control
  • Humus and primary sludge’s are stored in one place for simple tankering operation

Variable flows and loads

During low flow conditions the level in the primary tank is reduced utilising forward feed air lift pumps. This creates a buffering volume that reduces the impact during high flows

Low installation costs and flexibility on site

  • Off-site build significantly reduces installation time
  • Only a small excavation is required due to its compact modular design

Minimal visual impact

  • Does not impede views due to the below ground installation


  • Ideal for off mains drainage solutions
  • Design criteria is as per the water utility asset standard
  • Peak flow treatment – bespoke design but generally 3-6 dry weather flow or formula A flows
  • Discharge standards – as specified
    HiPAF will attain typically: BOD 10mg/l: SS 10mg/l: Ammonia Nitrogen 2mg/l (with tertiary treatment), however higher standards are achievable
  • BS1509001 CDM regulations
  • Standard packaged treatment system is below ground with an acoustically lined kiosk housing Form 2 or Form 4 control panel and blower options
  • Custom designed options available
  • MK3 water utility specification lids with protective grate

Each packaged treatment plant can be designed to site-specific requirements. Our complete in-house design and specification service can include initial site survey, project liaison and commissioning


  • Standard below ground systems are manufactured in glass reinforced plastic (GRP) which is ultra violet (UV)  stabilised with an external gel coat finish to extend the asset life to 25 years.
  • UK manufacture in a quality-controlled environment

WCS Environmental Engineering is a framework supplier to the UK water utilities with over 25 years experience creating custom-built packaged wastewater treatment plants for demanding environmental standards.

Image of WPL MK3 lids showing grates to walk on, part of the bespoke wastewater treatment system

Image: MK3 water utility specification lids with protective grate