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Greywater recycling in practice

In a nutshell

Getting to know how a system for recycling the greywater is installed.

45 min

13 years old

In class

Our objectives

In this activity you will:

  • Be informed about the steps in the installation of a greywater system.
  • Discuss the risks and benefits that a greywater recycling system has.

Water-readings

Greywater recycling is the practice of reusing wastewater generated produced from the washbasins, bath tubes, shower drains and washing machine equipment drains after a particular treatment.

Usually  the main operating parts of such a system is:


  1. The greywater pipelines have to be separated from the . The greywater is collected in a special water storage tank before its treatment process. The size depends on the water amount treated and its material must be resistant to commonly used chemicals (e.g. chlorine).
  2.  Then, the collected greywater is treated  using a set of filters and chemical substances (depending on the technology followed).
  3.  The treated greywater ultimately is collected in a storage tank ready to be used within 24 hours.

 

Water-readings

The case of the National Swimming Pool of Malta

The National Swimming pool of Malta is the main venue for the national water polo leagues, various international tournaments and important ‘swimming meetings’! It hosts approximately 800 athletes a day!  Greywater generated from the showers is a valuable water source, as it
can be treated and reused ! For this purpose, a greywater recycling system was installed by the “NCWR Programme in the Mediterranean” using a new filtration technology . The system is based on advanced technology that produces water of high quality, free from microorganisms and  hazardous substances. It is reused for toilet flushing in the premises and landscape irrigation.

 

Greywater system in a football course in Cyprus

Another example of installing a system for recycling greywater system comes from Cyprus and took place in the framework of the “NCWR Programme in the Mediterranean” too.

This time a football course was chosen, and namely the the football course of Ahnas. The greywater generated from the changing rooms’ showers and washbasins is initially pumped through special pipes to a storage reservoir. It is treated in a second reservoir, and is then ready to be reused for irrigation of the main and the secondary courts’ grass.

The football course overview 

Tanks of the greywater recycling installed

Play & learn

Greywater system in a football course

Drag and drop the main steps in the greywater recycling system installed in the Ahnas Football Course in Cyprus (read the previous water readings).

 greywater-recycling-in-practice quiz-hotspot
1
2
3
4
5
6
  • 1 1 greywater pipes
  • 2 2 greywater storage tank
  • 3 3 greywater treatment
  • 4 4 treated water
  • 5 5 distribution pipes
  • 6 6 watering the course with the recycled greywater

Stop and wonder

Uses & standards of the recycled greywater

As we saw, greywater after its proper treatment can be used for secondary uses such as the toilet flushing, car washing, watering of urban green areas and landscape, sports field irrigation as well as for groundwater recharge.

Nevertheless, it is not allowed to be used for contact with the human body nor for watering vegetables (tomatoes, cabbages, etc). However it can be used for water tree plantation i.e. orange, lemon trees, etc. When it is used for irrigation is forbidden to use sprinklers because of the risk to come in contact with the human body; it is allowed to be used i.e. through drip-irrigation or underground channels .

People’s attitude towards the use of treated greywater

In general people tend to accept or reject the use of greywater depending on the type of reuse. It is relatively well accepted to use greywater in golf courses, parks and industry. But people are more reluctant to use it at home. Actually, the level of acceptance to use greywater is influenced by the degree of contact with it: people tend to accept it when contact is minimal, e.g. for toilet flushing; they are less ready to use it e.g. for watering; and tend to refuse to use it e.g. in washing machines. Other studies show that users prefer to reuse their own greywater rather than that of communal recycling
schemes.

Play & Learn

Check for which of the following purposes we can use treated greywater

It is not suitable for drinking.

Recycled greywater can be used for secondary uses such as in the toilet flushing.

Recycled greywater can be used for in watering tree plantation (but not leafy plant and vegetables).

It is not allowed to come in contact with our body and thus it's not allowed to use it in shower or bathing.

Though recycled greywater can be used in watering the urban green it is not allowed to do that with sprinklers because it may come in contact with people.

Recycled greywater can be used for secondary uses such as in watering the urban green.

Recycled greywater can be used in watering the tree plantation but not leafy plants and vegetables

Though recycled greywater can be used for secondary uses, is not suitable for fountains because it may come in contact with people.

Water shares


Water meter

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Go back to the homepage!

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