Discover the HiPAF® compact (HPC)
1 up to 60 population equivalent (PE) where mains drainage is unavailable
The below ground HiPAF compact (HPC) wastewater system uses no chemicals and treats to a high standard for more stringent standards stipulated by the Environmental Agency.
The HiPAF is preferred choice for sensitive locations such as Sites of Special Scientific Interest (SSSI) and is ideal for locations which need extra consideration such as a burn, nature reserve, fisheries, salmon river or close proximity to water extraction (well).
Specified by the highly regulated water utilities.
Why choose the HiPAF compact (HPC):
* Warranty subject to correct installation, consistent influent conditions and regular plant maintenance as per the manufacturers’ instruction.
The compact unit is a three-stage wastewater treatment process
1. Primary settlement tank
2. Settled solids at the bottom
3. Biological treatment unit (biozone)
4. Air diffusers at the bottom of each chamber
5. Filter media
6. Settled sludge air lift back to primary
7. Final (humus) settlement tank
- Primary – Primary settlement is in accordance with EN12255-4, giving the required hydraulic retention time and ensuring that 30% of the BOD will settle out in the primary tank. The HiPAF plants below 500 persons will have sludge storage integral to the primary tank. The primary settlement tank is equipped with baffles to prevent floating scum entering the biological phase of the treatment process. It also incorporates WPL’s unique forward feed system which lowers the level in the tank, during periods of low flow, to provide a buffering capacity for possible surges in the influent.
- Biological – After primary settlement, the settled liquor flows to the biological treatment unit by displacement and via the air lift forward feed. The biozone is fully segmented internally to eliminate the risk of process short cuts. Each biozone segment is filled with high voidage plastic filter media, where both carbonaceous and nitrifying processes take place, mitigating process risks associated with variable loads. Air to oxygenate the influent and to scour excess biomass from the filter media is introduced continuously below each chamber by a series of diffusers.
- Final – Following biological treatment the effluent flows into the final (humus) settlement tank where the excess biomass settles out. The humus tank is equipped with air lifts which are arranged to automatically transfer settled humus sludge to the primary tank for co-settlement. The treated effluent flows under gravity to the works outfall.