This document discusses nanofiltration membrane technology. Nanofiltration uses nanometer sized pores to remove ions, viruses, bacteria, and other contaminants from water. Spiral wound membrane modules are most commonly used, with flat membrane sheets wrapped around a central tube. Separation occurs through convection, diffusion, and sieving mechanisms. Nanofiltration is effective at removing dissolved matter, microorganisms, organic compounds, nutrients, metals, and salts. It has applications in water treatment, desalination, and various industrial processes. Advantages include chemical-free operation and reduced discharge volumes, while disadvantages include higher energy use than other membranes and limited retention of salts.
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This presentation explains about membrane filtration and its type. I collected information from different source and accumulated to make this. Hope you will find it useful.
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This is a descriptive note on Membrane separation. If you like this note or content please like comment and share. Your like inspires me very much .Thank you.
Membrane filtration by Akram Hossain, Food and Process Engineering, HSTUAkram Hossain
This presentation explains about membrane filtration and its type. I collected information from different source and accumulated to make this. Hope you will find it useful.
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This is a descriptive note on Membrane separation. If you like this note or content please like comment and share. Your like inspires me very much .Thank you.
Cross Flow or Tangential Flow Membrane Filtration (TFF) to Enable High Solids...njcnews777
Cross Flow or Tangential Flow Filtration (TFF) Membrane Plants are used in Desalination, Brackish Groundwater Treatment, High Chloride Surface Water Treatment, Waste Water Treatment Plant Effluent Reuse, Biopharmaceutical, Food & Protein Applications for removal of undesired constituents and harvesting of desireable products. Cross flow membrane filtration technology has been used widely in industry globally. Filtration membranes can be polymeric or ceramic, depending upon the application. The principles of cross-flow filtration are used in reverse osmosis, nanofiltration, ultrafiltration and microfiltration. When purifying water, it can be very cost effective in comparison to the traditional evaporation methods. Techniques to improve performance of cross flow filtration include:
Backwashing: In backwashing, the transmembrane pressure is periodically inverted by the use of a secondary pump, so that permeate flows back into the feed, lifting the fouling layer.
Clean-in-place: Clean-in-place systems are typically used to remove fouling from membranes after extensive use. The CIP process may use detergents, reactive agents such as sodium hypochlorite and acids and alkalis such as citric acid and sodium hydroxide.
Concentration: The volume of the fluid is reduced by allowing permeate flow to occur. Solvent, solutes, and particles smaller than the membrane pore size pass through the membrane, while particles larger than the pore size are retained, and thereby concentrated. In bioprocessing applications, concentration may be followed by diafiltration.
Diafiltration: In order to effectively remove permeate components from the slurry, fresh solvent may be added to the feed to replace the permeate volume, at the same rate as the permeate flow rate, such that the volume in the system remains constant. This is analogous to the washing of filter cake to remove soluble components. Dilution and re-concentration is sometimes also referred to as "diafiltration."
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2. Introduction:
Nanofiltration is one of a group of similar
membrane processes (including reverse
osmosis, Ultrafiltration , and microfiltration)
used most often with low total dissolved
solids water such as surface water and
fresh groundwater, with the purpose of
softening (polyvalent cation removal) and
removal of disinfection by-product
precursors such as natural organic matter
and synthetic organic matter.
3. Membrane Filter in brief:
The membrane filter uses a relatively thin
material with a well-defined maximum pore
size and the particle retaining effect takes
place almost entirely at the surface.
Membranes offer the advantage of having
well-defined effective pore sizes, can be
integrity tested more easily than depth
filters, and can achieve more filtration of
much smaller particles.
4. Nanofiltration is a membrane filtration -based
method that uses nanometer sized cylindrical
through-pores that pass through the membrane
at 90. Nanofiltration membranes have pore sizes
from 1-10 nanometers. Membranes used are
predominantly created from polymer thin films.
Materials that are commonly use include
polyethylene teraphthalate or metals such as
aluminum.
6. Nanofiltration membrane modules:
Membrane types are mainly classified into; hollow fiber type, tubular
type, capillary type , flat sheet type and spiral wound type
depending on its construction method. For Nanofiltration , spiral
wound type membranes are the most commonly used style of
module.
Spiral wound type provides:
-- Available in a range of standard diameters (2.5”, 4” and 8”)
to fit standard pressure that can hold several modules in
series connected by O-rings.
-- The module uses flat sheets wrapped around a central tube.
- The membranes are glued along three edges over a permeate
spacer to form ‘leaves.
- The permeate spacer supports the membrane and conducts
the
permeate to the central permeate tube.
- Between each leaf, a mesh like feed spacer is inserted.
7.
8.
9. The NF separation mechanism:
The NF separation mechanism can be identified as a sum of convection and
diffusion transport mechanisms,
** Convective transport of ions with the water flux through the membrane
is caused by the pressure difference between feed and permeate sides.
** diffusive transport is a consequence of the concentration gradient as
achieved by the rejection of solutes Electromigration is caused by a
“streaming potential” difference across the membrane.
** streaming potential is caused by the electric current generated by the
convective flow of a fluid that is necessarily charged through the pores of
a charged membrane
** For uncharged molecules, sieving or size exclusion is primarily
responsible for separation and is controlled by molecular size in solute
form.
12. Effectiveness of NF:
Micro-pollutants like herbicides and insecticides, as well
as low-molecular components like colorants and sugars
can be very successfully blocked using a Nano-filtration
membrane.
NF can be implemented for removing the following
parameters (removal yield indicated in brackets):
- Dissolved matter (>75%).
- Harmful micro-organisms, e.g. bacteria, protozoa,
algae, fungi (>90%).
- Persistent organic matter (50-75%).
- Organic compounds (50-90%).
- Nutrients (incl. phosphates).
- Metals (50-90%).
- Inorganic salts (e.g. sulphates).
13. Applications of NF:
1-Industrial applications:
* Food and dairy sector.
* Edible oil processing sector.
* Petroleum industry.
* Drug industry.
* Paper pulp industry
2-Water treatment.
3-Desalination of water.
4-Water softening.
14. Advantages:
- Lower discharge volumes, lower retentate
concentrations than RO for low value salts.
-- Reduction salt content and dissolved matter
content (TDS) in brackish water.
-- chemical-free. e.g. needs no salt or
chemicals during operation.
- pH of water after Nano-filtration is normally
non-aggressive.
15. Disadvantages:
- Higher energy consumption than UF and MF
(0.3 to 1 kWh/m³).
- Limited retention for salts and univalent ions.
- Membranes are sensitive to free chlorine
(life-span of 1000 ppmh). An active carbon
filter or a bi-sulphite treatment is
recommended for high chlorine
concentrations.