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We have presumed that the characteristics of the raw
water will be remaining in the above range ane we have considered for both the river and well water as an input to the treatment plant.
Physico-chemical treatment section.
The Raw Water from the river is first collected into the
underground primary setting tank for holding raw water
equivalent to minimum 24 hours requirement of the
treatment plant.This is required for the primary setting of
the suspended materials and also maintaining a steady
flow of the water into treatment plant as well as
maintaining more or less uniform characteristics of the
raw water for treatment in the treatment plant.
Bar screen fitted at the inlet removes macro suspended
particles.
Raw water will be drawn by means of raw water transfer
pump set for feeding the same to the subsequent treatment
plant.Depending on the biological load pre chlorination may
be done by adding sodium hypochlorite or liquied CL2
through tonner.
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Flash Mixer:Raw water from the primary setting tank is
taken into the flash mixer where Ferrous Sulphate/Alum
solution,Lime solution, poly electrolyte solution will
be dosed in order to remove of colour(if any),BOD and
COD content of the raw water to some extend by means
of coagulation following by flocculation.Ferrous
Sulphate/Alum solution and the lime solution will be
dosed at the inlet of the flash mixer through gravity.
If required Polyelectrolyte solution will be dosed in the
raw water as floculant for the purpose of removal of
coagulated mass generated out of the suspended impurities.
Polyelectrolyte solution will be dosed in the flash
mixer by means of metering pump of through gravity.
The resultant raw water along with chemical solution
will then be fed into the clarifier by gravity for
the purpose of removal of sludge,produced in the flash
Mixer.The clarifire is provided with the centeral drive
arrangement.Along with a sludge scraper blades positioned
on the floor of the clarifire slowly sweeps settled sludge
into a central sludge hopper.From the clarifire hopper,
settled sludge in carried by gravity from the bottom of the
clarifire to a sludge drying bed.From sludge drying bed,
filtered water is recycled back to the clarifier.Sun
dried sludge will have to be remove from the time to time.
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