Thames & Kosmos Global Water Quality handleiding

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DID YOU KNOW?

How Water Puriﬁcation Works

Modern water purification plants work with mechanical, biological,

and chemical processes applied in sequence. In other words, they

are designed to have three stages. The dirty water is first sieved

with a so-called screen, which holds back large impurities such as

branches, dead animals, leaves, rocks, or empty bottles. Then the

dirty water flows into a settling basin. There, heavy particles such

as sand and broken glass can sink to the bottom. Next, the water is

directed into an aeration basin. This is where bacteria get into the

act. They produce an organic slime that can be used as fertilizer.

In addition, the dirty water is chemically treated in order to bind

pollutants to other materials that can then be filtered out.

Fill the other filter column sections with

sand and small rocks as before.

Pour a small cup of colored liquid through

the filter.

Explanation:

Activated charcoal provides a very effective

cleaning. The charcoal binds to the dyes and

removes them from the water. Activated charcoal

is very porous and crumbly, so it has a very large

surface area for the dyes to stick to.

Tip: If you have more than one

filter system, you can assemble

their various filter sections into one

gigantic tower with all kinds of

different filters.

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