Commercial & Non Household Greywater Recycling

Quick explanation

1. Gravity transports greywater to the system.
2. Preliminary filtration removes large debris (like hair).
3. Greywater enters biological treatment tank for oxygenation.
4. Oxygenation helps the growth of beneficial bacteria.
5. Fine hollow fibers filter out bacteria and viruses.
6. Treated greywater is stored in clean tank for distribution.

Detailed explanation

Pre Filtration 

Greywater is transported from collection points within bathrooms across the building via a separate network of pipes. Not only does this eliminate the potential for cross-contamination, it also allows the possibility of heat exchange technologies to recover heat from the waste greywater.

Preliminary filtration removes undissolved contaminants from the greywater supply including hair and textile fibres. On Stormsaver Systems, preliminary filtration is supplied with a high-pressure backwash feature which supplies processed greywater to provide self-cleaning to the preliminary filtration device. 

Biological Treatment

Greywater then enters the biological treatment tank.

The biological treatment process introduces aeration to naturally degrade organic contaminants such as shower gels and foam. The biological treatment tank also contains growth bodies to separate biofilm from the greywater. Growth bodies are designed to increase the surface area within the tank for biofilm to attach. 

Sedimentation

Aeration assists suspended solids in settling on the base of the treatment tank via sedimentation. These are removed via an efficient sludge pump. 

Ultrafiltration 

Greywater is then processed through ultrafiltration. Ultrafiltration processes greywater through hollow fibres to separate any remaining microbiological particles such as bacteria and viruses (rated to 0.02 microns). The automatic self-cleaning process includes a short backwash of the ultrafiltration device to remove contaminants for the best possible water quality. The control panel fully automates this process for complete peace of mind. 

Storage 

Treated greywater is then transferred a separate clean water tank for storage until required. A low nutrient load from the biological treatment process and removal of solid particles ensures greywater can be stored for extended periods. 

Mains water topup

Where limited greywater is available, an automatic mains water backup will continue to provide a water supply to outlets. The mains water backup is achieved through a WRAS-compliant air gap in the clean water tank. The process is fully automated by our control panel. 

Water Availability

Water is our most precious resource. 

Just like many natural resources, it is expected that we will face shortages in the future. In the UK alone, our water deficit is set to reach 5 billion litres per day, according to the Environment Agency. 

Greywater Recycling provides a solution to reduce reliance on public water supplies by collecting and recycling wastewater already on site. Greywater can meet up to 75% of the total water demand. 

Discharge Rates

UK drainage infrastructure frequently reaches capacity and overflows during heavy storms. Every time a sewer overflows, untreated sewage is released into local water courses. 

Greywater forms a large volume of wastewater runoff from a building. Reusing this greywater is an effective method of reducing the volume of runoff from the site. 

Results

Greywater Recycling is a highly safe method of reusing greywater. A mixture of physical, biological, and chemical treatment ensures complete peace of mind over the safety of supply. 

Where recycled greywater can be used...

Greywater Recycling is an effective solution for improving water efficiency through the provision of a non-potable water supply. Non-potable water supplies can be used for the following applications...  

• Toilet and urinal flushing
• Vehicle washing
• Cleaning and wash down
• Laundry
• Living wall watering and irrigation
• Industrial and manufacturing use
• Cooling and conditioning

Ideal building types 

Greywater Recycling is most suited to high-capacity buildings where a continuous supply of non-potable water is required to serve connected outlets. Greywater Recycling can also be used where there is limited roof space available for the collection and reuse of rainwater. Greywater Recycling can be used as an alternative to rainwater harvesting or the technologies can be combined to provide higher volumes. 

• Leisure centres 
• High-capacity venues 
• Offices 
• Hotels
• Mixed-use developments

Commercial Greywater Recycling captures and recycles water from showers, handwash basins, and bathtubs for the creation of a non-potable water supply.