HUBER Solution GreyUse® for Reuse of Grey Water

Grey water is defined as domestic wastewater that does not contain faecal matter. At large buildings, such as hotels, there are two options for treatment and reuse: either of combined wastewater or of separately collected grey water.

Grey water from bathrooms, kitchens and laundry rooms is only moderately polluted in comparison with black water from toilets and urinals. It contains far less solids, germs and nutrients. Its treatment is far easier. By reduced fresh water consumption and wastewater disposal, economical as well as environmental benefits are achieved.

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Separate collection, treatment and reuse of grey water are sensible where:

  • separate grey water and black water collection as well as redistribution of treated grey water throughout the building is feasible, e.g. in new buildings and developments, or where existing buildings are fundamentally rehabilitated;
  • black water can be discharged into sewers or separately treated in concentrated form by anaerobic digestion with biogas generation (it is concentrated where water-saving vacuum toilets and waterless urinals are provided).