NCWR

About NCWR

Do you know about grey water?

In a nutshell

In this activity we find out what “greywater”is  and how we can recycle it!

1 class hour

12-13 years old

In class

Our objectives

In this activity you will:

  • Explore greywater, one of the “non conventional” water resources.
  • Learn how greywater gets recycled.

Play & Learn

Can we reuse the soapy waters after washing of our hands?

Water-readings

What is grey water?

Greywater is the household’s wastewater, other than that coming from toilets (), meaning the wastewater from the the sink, shower, washbasin, bath-tub and laundry machine. This wastewater can be relatively easily, treated and reused.

Modern technology offers a lot of options for an effective greywater treatment. The most popular greywater systems treat water coming from the showers, bathtubs, washbasin and laundry machines, but not that from the kitchen sinks and the dishwashers, as this requires a more complex and costly technology.

Play & Learn

Which of the following activities produce greywater? Check appropriately.

Actually, many car washing stations are equipped with a system for collecting, treating and reusing the greywater.

Water from the swimming pool is not considered as greywater because it contains a lot of chlorine that can be toxic.

Water after taking a shower it mainly contains remains of soap, shampoo, shower gels, etc that can be relatively easily removed through filters.

This is “black water” and it goes to the sewage system (and through that to the wastewater treatment plant).

This water contains big amounts of grease and oils and is more complex to be recycled.

This water contains remains of detergents that can be relatively easily removed through filters.

This water contains big amounts of grease and oils and it is more complex to be recycled.

It contains mainly dust (and soap for the taps in the school premises) residues and can be easily cleaned.

Water-readings

How do we treat greywater?

Greywater treatment is realised through an automatic closed system that includes pipes, pumps, filters and tanks. Firstly, the greywater from the washbasins and the shower/bathtub is collected through pipes and led to filters that hold the large suspended solids.

Then, this water is led to the treatment tanks where it is aerated, re-filtered, and to eliminate any harmful microorganisms.

Finally, water is stored to a tank and is ready to be used both inside and outside the building, with the help of a .  The treated greywater is mainly used in the toilet flushing.

The entire system is closed and automatic, so that there is no human contact for safety and hygiene reasons. A control unit is included as and the users need to maintain the system (change filters, add disinfectants, etc.) following the manufacturer’s provisions.

The treated greywater should not stay long in the storage tank: If it is not used within 24 hours the stored water is channeled to the sewage network.

A household that recycles its greywater can save up to 1/3 of consumption from the water supply network!

Play & learn

Based on what you read in the previous water readings drag and drop the parts of the greywater system below in the correct spot.

 grey-water-system quiz-hotspot
1
2
3
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5
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8
  • 1 1 filters
  • 2 2 disinfection
  • 3 3 control unit
  • 4 4 storage tank
  • 5 5 aeration pump
  • 6 6 sewage network pipe
  • 7 7 source of greywater
  • 8 8 treatment tanks

Water shares


Water meter

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Way forward

Dive in…

the Rainwater harvesting , the Wastewater treatment or the  Desalination unit if you want to know about other non-conventional water resources.  Examples of greywater systems if you want to know more  about how an actual greywater system installed.

Go back to the homepage!

Acting for Climate

Water works through time

Water in the city

The water basins

Desalination

Greywater recycling in practice

Do you know about grey water?

Wastewater treatment

Rainwater Harvesting Systems in practice

Rainwater harvesting

Reduce-Reuse-Recycle

Climate change: Why should I care?

Water resources

The water cycle

Where do I begin?

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Water works through time

Let's discover the story behind the old fountains, cisterns and aqueducts of our town!

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What is the "urban water cycle"? Which are the important aspects of water management within a city environment?

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In this activity we learn what a water drainage basin is and why it is important for the experts to study it.

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Desalination

Let's find out how sea and brackish water can become a freshwater resource!

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Greywater recycling in practice

How a greywater system is installed? Let's find out!

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Let's find out what "greywater” is and how we can use it!

Continue!

Wastewater treatment

In this activity we learn about how wastewater is treated and what we can do with the treated water.

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Rainwater Harvesting Systems in practice

What are the various types of rainwater harvesting systems? Let's find out more about them!

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What is our water footprint and how can we reduce it?

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Lt's discover the water resources of our region.

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The water cycle

Let's travel within the water cycle!

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Where do I begin?

Let's see why it is important to know about water in our region.

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