It is
true that the roughing filter is already in existence but the modified roughing
filter incorporated newer techniques to yield water that is safe for reuse.
Adsorption, mechanical trapping and screening techniques are used to ensure
this. Contaminated water is passed through five tanks. The first tank contains
large gravel, the second medium sized gravel, the third has bricks, the fourth
thank contains chips and the last is filled with activated charcoal. Each of
these removes one of the major contaminants of water.
Testing
of the purified water showed that water was indeed much cleaner with all
contaminants well below the permissible limit.
Clearly
the roughing filter shows creativity, talent and the desire to work for the
greater good among these young future engineers.
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