Nano water technology
nanotechnology has entered the sphere of water treatment processes. Many different types of nanomaterial’s are being evaluated and also being used in water treatment process.
Desalination is a key market area. Vast majority of worlds water is salt water, and though technology has existed for years that enables the desalination of ocean water, it is often a very energy intensive procedure and therefore expensive
Published on: Mar 3, 2016
Transcripts - Nano water technology
Water has always played a prominent role
in human civilization.
An adequate supply of
safe drinking water is one of the major
prerequisites for a healthy life, but waterborne
diseases is still a major cause of death in many
parts of the world .
For better water treatment
processes NANOTECHNOLOGY is preferred.
Many Different types of nanomaterial’s are
used in Water Treatment process.
Nanotechnology holds Great promise in
desalination, purification and water treatment.
Nano is the Greek word for dwarf
Nanotechnology deals with the objects on
the order of a nanometers(10-9m)
Nanotechnology is science, engineering,
and technology conducted at the
nanoscale, which is about 1 to 100
. One nanometer is a billionth of a meter, or
10-9 of a meter
The key features that make nanoparticles
attractive for water treatment……….
More surface area and small volume
The higher the SA:V, the stronger, more
stable and durable
Materials may change optical, electrical,
physical, chemical, or biological properties
at the nanoscale level
Makes biological and chemical reactions
Can attach various reactor groups to
increase the chemical affinity to words the
› Time consuming
› Fails to remove the heavy metal
Ordinary activated carbon filters:
› Not able to remove micro organisms
› Chemical pollutants and heavy metals
› Application of uv lightning require longer radiation
› Reverse osmosis process
› It may remove the useful nutrients from the water
› removes the useful minerals
Made of carbon nano tubes
Pore size 0.0001-0.001um
Can remove virus ,bacteria ,
suspended solids, large multivalent
ions, dissolved organics ,
Operating cost is less
Useful in desalination operations
Carbon nano tubes
1)Current passage to nano tubes
2)Contaminants caught in nano tubes
reduced due to current
Used majorly in water remediation. For
removing inorganic and organic
pollutants, from contaminated water.
Nanoparticles used as sorbents.
Nanoparticles can be functionalized with
various chemical groups to increase their
affinity towards target compounds.
Nanocrystalline zeolites can remediate
water containing cationic species such
as ammonium and heavy metals. As well
chemicals like 137Cs and 90Sr. .
Magnetic nanoparticles bind with
contaminants , such as oil and arsenic
and removed using a magnet.
Magnetic nanoparticles have large
surface areas relative to their volume
and can easily bind with chemicals.
In water treatment applications, they
can be used to bind with contaminants
— such as arsenic or oil — and then be
removed using a magnet.
Nanoparticles serve as catalysts.
A nanocatalyst is a substance or materials with the
catalytic properties that has at least one nanoscale
dimension either externally or in terms of internal
Used for Chemically degrade pollutants, heavy metals.
some of the nanocatalysts are…
› Titanium dioxide
Methods of waste water treatment using
There are various methods for wastewater treatment using
nanocatalyst. one of the eco-friendly and less expensive
•Nanotechnology can also detect water-borne
Contaminants like heavy metals.
•A new type of nanomaterial called nanostructured silica has been found to
detect heavy metals
•It has large surface area and regular pores, has the capability of being able
to extract heavy
metals from wastewaters.
•Electrodes are separated with a small atomic gap so a few ions can be
Potential health and environmental risks.
reactivity of nanomaterials in case they
are released into the environment and
come into contact with leaving
Carbon nanotubes can cause lung
Integration of nanomaterials into existing
water purification systems.
Availability and cost.
Already showing promising results.
Once certain impending hurdles are
overcome, will solve the global water
Proper studies are to be carried out to
assess any harmful effects on
environment and living beings.