HOME  ⇾   Business Areas  ⇾   Modular Equipments  ⇾   Water Reuse  ⇾   Greywater reuse system
Water Reuse

Greywater reuse system

Greywater may come from sinks, baths and showers, or from home hygiene and used utensils. Greywater means almost 50 % of the total amount of water used in hotels, residences, apartment complexes, sports facilities, etc. It can be distinguished from black water by the absence of bacteria Escherichia coli.

There is a demanding, accurate regulatory framework in Andalusian that controls grey and rainwater reuse: Regional Ministry of Leisure and Tourism’s Decree 47/2004. Article 49 defines greywater reuse and treatment’s requirements in hotel facilities.

Greywater reuse’s benefits include:

  • A lower use of fresh water
  • Less wastewater regeneration
  • A high effective purification
  • Only solution in certain places
  • A lower energy and chemical use through pumping and treatment
  • Plants can grow where there is any other type of water
  • Recovery of lost nutrients
  • An increase of knowledge and sensitivity about natural cycles

One of greywater main uses takes place in tanks, an element with an elevated level of consumption that requires a lower quality water. It cannot be directly used because it generates unpleasant odors and stains if it is left for more than a day.

They are a source of value as compost for agriculture. Although phosphorus, potassium and nitrogen make greywater a pollutant for lakes, rivers and groundwater, it can be advantageously used as nutrients for plants watering. Another possible use is outdoor areas cleaning.