Recycling grey water

Recycling gray water from sinks, showers, laundry, dirty dishes, floors, and cooking represents an important step for protecting drinking water resources. Recycling 80% or more of this gray water results in substantial savings in terms of both usage costs and resource consumption. This can lead to significant savings when water costs are high. Combined with a calorie collection process, water recycling also offers significant energy savings (the temperature of gray water is often higher than 20°C).
This issue is even more important for public installations that consume high quantities of water, such as hotels, public swimming pools, hospitals, clinics, laundry services, etc.

FIRMUS France has developed a specific gray water recycling technology based on that which was setup in 2005, in cooperation with the European Space Agency (ESA) at the Concordia station in Antarctica for the French Polar Institute, Paul Emile Victor (IPEV) and the Italian Antarctica Research Program (PNRA). This treatment unit offers a daily treatment capacity up to 2,400 or 2,800 liters, the equivalent gray water production of approximately 25 people. The unit was designed by FIRMUS France's technical director, who is still in charge of monitoring the system today.

This technology, which includes a purification process using organic and inorganic membrane technologies, recycles between 75% and 85% of gray water. Depending on the requirements and sanitary standards to be respected, the process used for this solution can produce drinking quality water, enabling full recycling back into the sanitary network (showers and washbasins).

FIRMUS France worked in partnership with SHERPA Engineering, a systems engineering service company, to design and optimize the FGWRS process to manage energy within buildings and integrate EDF Optimal Solutions and recycle gray water. EDF Optimal solutions enables us to make the FGWRS process part of the building's energy optimization system.

  • SHERPA Engineering: System engineering service provider
  • EDF Optimal Solutions: Designer and creator of environmentally friendly energy efficiency solutions·        

FIRMUS France technology designs depend on the characteristics of the site to be equipped. Solutions must take into account the origin of gray water, frequency of use (or rate of occupancy), and expected results.

At the same time, it is difficult to know exactly how much grey water is generated in a given building. The volume depends on the site location, local habits, and the equipment properties. This document (in French): Principaux ratios de consommation d’eau – Etude SMEGREG 2007(Principle ratios of water consumption – SMEGREG 2007 report) offers a general idea about water consumption and recycling potential.

Fill in this questionnaire so that we may estimate the most appropriate design for your supply: Questionnaire