1) EFFLUENT WATER SUPPLY PUMP: (RWP)
A Mono Block pump has been provided for supplying Effluent Treated
Water to Pressure Sand Filter Unit. Necessary Suction / discharge pipe
work in M.S,PVC construction with Rubber Diapharm valves are also
provided up to PSF Unit.
2) PRESSURE SAND FILTER: (PSF)
Effluent Water is first filtered by filtration unit. Pressure Sand
Filter Unit is provided for removal of suspended matters &
turbidity from Effluent Water. PSF Unit is a MS Epoxy Coated vertical
Pressure Vessel. Internally, it is fitted with bottom collecting
system. A uniform grades silica quartz sand is charged on the
supporting media of pebbles and gravels. This unit is fitted with
MS,PVC frontal pipe work and Rubber Diapharm Valve or Multiport Valve
externally. During service cycle water is passed in down ward direction
through sand bed, thus entrapping suspended matter & turbid
particles. Over a period of time, sand bed gets chocked due to
suspended matters resulting higher pressure drop and lesser flow. At
this stage filter bed need to be backwashed.
When pressure drop across the sand bed increases beyond the specified
limit (0.5 kg/cm²) or quality of filtered water determinates, which
ever is earlier. Regeneration involves backwash & rinsing of Sand
Bed as below. For backwashing service water is passed in reverse
direction of service cycle to loosen the filtering media bed. Due to
this, entrapped suspended matters get free and comes out along with
effluent water. Backwashing is continued for about 10- 15 minutes or
till the effluent coming out is clear
For Rinsing of Sand Bed : Service water is passed in down ward
direction to settle down the sand bed. The effluent water is drained
for about 5 minutes time to ensure all unclear water is drained down.
3) ACTIVATED CARBON FILTER: (ACF)
Effluent water may contain Colour, Odour, Chlorine & Organics in
different proportion, which is undesirable for potable application, and
hence, it is necessary to remove the same from water.
Activated Carbon can remove Chlorine, Odour, & Colour while passing
the water through carbon bed along with Odour & colour. This Carbon
granules having larger surface area and specific property to absorb
organics. ACF Unit is a M.S/FRP vertical pressure vessel. Internally it
is fitted with strainer on bottom collecting system. The unit is fitted
with M.S/PVC frontal pipe work & MPV externally. A granular
activated carbon is charged on the supporting media of Coarse &
Fine Silex. During service cycle water is passed in down ward direction
through Carbon Bed, which removes Chlorine & Odour from water.
When pressure drop across the Carbon Bed increased beyond the specified
limit of (0.8 kg/cm²) or quality of filter water deteriorates,
whichever is earlier the unit is isolated for regeneration. The
regeneration involves, backwashing & rinsing of Carbon Bed. Over a
period of time, life of carbon gets exhausted which can be checked
during laboratory testing. Particularly iodine value is most important
for this application. Generally carbon is replaced once in a year
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