Slow sand filtration water treatment plants
Practical Action
DISINFECTION: small-scale drip chlorinator
Description
Original solution tank
This consists of a small concrete tank on top of the reservoir, placed near the water
inlet and next to the tank cover. The inner walls and floor of the chlorinator must be
lined with a 2cm layer of
cement with a sealer to
prevent leaks.
It is
important that there should
be no leakage – particularly
through the floor – because
the chlorine could
deteriorate the structure of
the reservoir. The floor
should be slightly sloping
towards the cleaning pipe.
The tank should have a
maximum storage capacity
sufficient for seven days.
Small-scale chlorinator lid
The cover over both the
chlorinator and the reservoir
should have a padlock to
prevent strangers from
handling them.
They
should always be in place in
order to prevent the
chlorine from evaporating.
Chlorine can still evaporate
through the grooves
between the cover and the
walls of the chlorinator,
however. To prevent this, a
rubber inner tube should be
nailed to the edges of the
tank so that it is
hermetically sealed.
Drip installation
This consists of a ½” pipe
and a ½” plastic tap placed
3cm above the floor of the
chlorinator. The tap is useful for controlling the drip. The drip control system
consists of a floater and a pipe with a hole through which the flow – and therefore
the drip – can be constant.
Cleaning pipe
This is a ½” plastic pipe which is level with the floor of the chlorinator. It has a plug
at the outlet point which can be opened when the chlorinator requires cleaning.
(Marrón, 1998b).
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