Greywater system
Greywater treatment by mechanical systems is typically based on filtration or treatment with chemicals. In filtration, the aim is to remove impurities using filters, with typically a few or several filters in a row in order to guarantee good results.
Some building-level solutions for grey water treatment and reuse (including nature-based) are commercially available, SWT example:
REDI gives a solution for single-family houses, where the treated greywater can be used for watering the garden.
Disinfection can be done with commercially available solutions, e.g. with ozone and ultraviolet (UV) light.
Greywater treatment with nature-based solutions for indoor or outdoor modules in multi-level green walls/green façades was carried out in Houseful. The project tested also ozone and ultraviolet light for disinfection.
Water management systems and how to monitor and collect water condition information for urban water management platforms were piloted in UNaLab.
Green walls and constructed wetlands were piloted in NAWAMED, with a focus on grey water treatment from a public building, a parking area, and a refugee camp.
A service model for grey water treatment with NBS was tested in Houseful. The service model considers a leasing contract and a payment fee per m3 of water treated and reused.