Ultrafiltration

1. BY
K.P.VINEETH
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2.  ADSORPTION.
 REVERSE OSMOSIS.
 ION EXCHANGE.
 ULTRA FILTRATION.
 DEFLUORIDATION.
 REMOVAL OF IRON AND
MANGANESE.
 REMOVAL OF COLOUR AND
ODOUR.
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3.  Ultra filtration is a separation
process using membranes with
pore sizes in the range of 0.1 to
0.001 micron.
 Typically, ultra filtration will
remove high molecular-weight
substances, colloidal materials,
and organic and inorganic
polymeric molecules
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4.  Influent water enters the tubes and is
filtered against the wall surface; Silt,
sediment, turbidity as well as
microorganisms are retained inside the
membrane wall as they cannot pass the
fine tube walls.
 Filtered water (permeate) is collected
on the exterior wall of the fibers and
exits the permeate port.
 During flushing cycle, the solenoid
valve on drain port opens, forcing
water through the membrane fibers
and removing all accumulated debris
down the drain line. The cycle can be
adjusted depending on water quality.
 Forward and Backward flushing are
achieved automatically and Manually.
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5. Normal Operation
Valve (A Open , B Closed )
Backward Flush Forward
Valve ( A closed, B Closed)
Forward Flush
Valve ( A opened , B
opened )
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6.  Ultra filtration Membrane
modules come in plate-and-
frame, capillary, spiral-wound,
and tubular configurations. All
configurations have been used
successfully in different
process applications.
 Each configuration is specially
suited for some specific
applications and there are
many applications where more
than one configuration is
appropriate.
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7. 7/15

8.  Flow Across the Membrane
Surface.
 Operating Pressure.
 Operating Temperature.
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9.  Pore size of membrane :
0.001micron
 Type of membrane : Multi bore /
Seven Pore
 Number of bores per fiber : 7
 Material of membrane : Polyether
sulfone
 Diameter bores : 0.9 mm
 Diameter fiber : 4.2mm
 Maximum system pressure : 10 bar
 pH range during operation : 3 – 10
 Maximum water
temperature:40°C& 80°C(Special
housing)
 pH range during cleaning : 1 – 13
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10.  In high purity water systems, ultra
filtration is slowly replacing the
traditional 0.2-micron cartridge
filters. In Japan, practically all of
the semiconductor industry
follows this practice.
 An ultra filtration has a nominal
pore size of 0.003micron.
 When an ultra filtration membrane
is used instead of a 0.2-micron
cartridge filter, particle removal
efficiency is greatly improved.
 In addition, Ultra filtration
membranes are not susceptible to
the problem of bacteria growing
through them, as is the case with
0.2-micron filters.
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11.  Ultra filtration system
operation and maintenance is
similar to that of reverse
osmosis systems.
 Daily records of feed and
permeate flow, feed pressure
and temperature, and pressure
drop across the system should
be kept.
 Membranes should be cleaned
when the system permeate rate
drops by 10% or more.
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12.  Ultra filtration will find an
increasing application in the
production of high purity water.
 The basic principles outlined
here should help in the
understanding and use of this
technology
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13.  Gaudet, P.W. "Point-of-use Ultra
filtration of De-ionized Water and
Effects of Microelectronics Device
Quality, American Society for
Testing and Materials", 1984.
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14.  Feed - Liquid to be treated by
the ultra filtration system.
 Permeate - Liquid stream that
passes through the membrane.
 Flux - Permeate flow per unit
area of membrane per unit
time (gallons/ft²/day)
 Flow Velocity - Rate at which
the liquid goes along the
membrane surface, expressed
in length per unit time (ft/sec)
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