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Treatment of Drinking - and Service Water
Gerus (1999-2001)
In order to treat drinking water and service water you
can purify it with an electrolytic process instead of
adding disinfectants. During the process of a simple
electrolysis the necessary chlorine/hypochlorite is
generated out of the existing salts in the water.
This process causes problems because thereby hydrogen
is developed at the cathode and is gathered in the
piping. We solved this problem with the help of a kind
of an "oxygen pump".
Instead of metal sheet a gasdiffusion electrode is
implemented as an hydrogen consumption electrode. It
takes up air oxygen and generates hydrooxideions
which are changed into oxygen at the developing electrode.
Because, while operating, these electrodes are calcifying, you
have to reverse the polarity of the cell continuously.
So in the acid environment the lime can be broken down
while oxygen is developing.
We developed a carbon electrode on a titan mesh that
works reversibly. Accordingly it can be used as an oxygen
electrode for both a fuel cell and an electrolyser. We achieved
this with the help of a porous graphite electrode.
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