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Membrane technology has advanced significantly
in the past decade, for both water purification and wastewater
treatment. Today, membrane-based systems have become the
preferred technology for many potable water purification
& treatment applications: Cryptosporidium and Giardia
control, color or suspended solids removal, etc.
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Most recently, the combination of membranes
with the activated sludge process has redefined basic sewage treatment,
optimizing the biological treatment operation and yielding a treated
effluent that is ideal for reuse.
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Two
key advances in membrane technology are at the leading edge
of this trend:
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Quality & bacteria-free
effluent with high efficiency in removing organic &
inorganic matters |
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Minimum plant size with elimination
of conventional element |
c |
Stable & efficient biological process
is maintained
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Membranes
are low-pressure driven element and available in a diverse
range of forms and configurations, with membrane pore size
or molecular weight (MW) separation being the primary characteristic
of differentiation. |
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| Hydro One Membrane for
MBR Application |
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The
recent development of less expensive and more efficient hollow fiber
membrane from Hydro One has generated new concept in membrane filtration
application. |
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It is capable of separating
both insoluble solids in the process fluid (bacteria, viruses,
colloids and suspended solids) as well as higher molecular
weight soluble organics, where nominal pore sizes ranging
from 0.1~0.01 micron. |
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The Hollow Fiber Membranes are used to
construct the Immersed Type MBR Membrane.
The membrane capillaries are long, flexible and extremely
durable. These membranes are “clamped” into top
and bottom distribution tubes, and will be assembled into
as a membrane module. |
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Membranes are immersed directly into
the mixed liquor of the biological reactor, reducing the entire
treatment process to a single-step operation and replacing
the clarifier of a conventional plant with an ultimate barrier
for biomass control.
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Almost all systems are now based on
the significantly more energy efficient, immersed, hollow-fiber
membrane, which exhibits a very large membrane surface area. |
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The large surface area in contact with
the process fluid allows operation at very low trans-membrane
pressures.
This, in turn, reduces fouling of the membrane surface and
allows for extended periods of operation with very low maintenance. |
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| Characteristic of Hydro
One Hollow Fiber Ultra-Filtration Membrane used in MBR application: |
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Material |
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Polypropylene |
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Capillary Thickness |
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40 ~ 50 µm |
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Capillary Outer Diameter |
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450 µm |
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Capillary Pore Diameter |
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0.01 ~ 0.2 µm |
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Gas permeation |
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7.0 x 10-2 cm3/cm2 • S • cmHg |
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Porosity |
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40 ~ 50% |
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Lengthways strength |
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120,000 kPa |
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Designed flux |
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6 ~ 9 L/M2/H |
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Area of membrane module |
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5 m2/module or 8 m2/module |
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