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Blue Green and Grey Water

What is Blue Green, Green Water and Grey Water

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Blue Green and Grey Water

▪The term ​virtual water ​was first ​defined in 1998.​

▪It is the ​volume of water ​required for ​making a ​product and the ​water used in ​the production ​chain.

▪​ Virtual water ​is comprised of ​3 different ​components: ​

  1. Green water
  2. Blue water
  3. Grey water

▪Different ​kinds of ‘​coloured ​water’ (​green, blue, ​grey and black-​which is not ​virtual water) ​are classified ​based on where ​they are found ​in nature or ​the level of ​contamination ​of wastewater. ​

▪Green water is the soil ​moisture from ​precipitation, ​used by plants ​via transpiration.​

▪It is part of ​the evapotranspiration​ ​flux in the ​hydrologic ​cycle. ​

▪Blue water is the ​freshwater: ​surface and ​groundwater. ​

▪It is stored ​in lakes, ​streams ​groundwater, ​glaciers and ​snow. ​

▪Grey water is polluted water which was not in ​contact with ​faecal matter ​ .

▪Grey water is ​the product ​water of ​domestic ​activities: ​bathing, ​laundry and ​dishwashing or ​polluted water ​due to ​pesticides in ​agriculture and ​nutrients from ​fertilizers. ​agrilearner

▪It can be ​recycled and ​reused, not for ​drinking, but ​for irrigation. ​Since it was ​not in contact ​with human ​waste, it can ​be used for ​watering crops ​and other ​plants and is ​safely ​reabsorbed into ​the ground. ​

▪Grey water ​contains soap ​and fat ​particles, even ​hair. If the ​chemicals Agrilearner ​content is not ​too high, ​majority of ​plants are able ​to handle it. ​However, if ​grey water is ​to be used for ​irrigation it ​is highly ​advised that ​what goes down ​the drain is ​heavily ​regulated.

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