Page 292 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

A reverse osmosis filter, which is a thin-film composite membrane
An ultraviolet lamp is in use for sterilizing any microbes that can escape filtering by the reverse osmosis membrane

Also, a second carbon filter to capture those chemicals that are not removed by the reverse osmosis membrane
Portable Reverse Osmosis Water Processors:
Portable reverse osmosis water processors are made for personal water purification. To work properly, the water
feeding to these units are under some pressure of 280 kPa (40 psi) or greater is the norm. Portable reverse osmosis
water processors are in use by people who live in rural areas as if without clean water. This is the water that is far
away from the city’s water pipes.

Rural people filter river or ocean water themselves, as the device is easy to filter the water. Many travellers on long
boating, fishing, or island camping trips, or in countries where the local water supply is polluted or substandard.
The use of reverse osmosis water processors is coupled with one or more ultraviolet sterilizers.
Advantages of reverse osmosis:
Reverse osmosis is the best method for water softening. As a matter of fact. It performs two functioning that is
water softening and water purification.
No ion particles are allowed to enter through the semipermeable membrane.
Maintenance is done when the machine is still operational.
It is easy to adapt and efficient in its working for filtration purpose.
Disadvantages of reverse osmosis:
A lot of energy is requiring for the entire process of reverse osmosis filtration.

There is a lot of pressure needed so that deionization can occur for further filtration.
During the process, the water might become acidic because it has been deionised of all its mineral content.
It is not advisable to drink water from the process because naturally, the water must have some minerals that help
in the functioning and malnutrition of the body.
UV water purifier:
A UV water purifier kills the microbiologically unsafe water with UV light. Whenever the water is exposed to the rays,
it disrupts the DNA of microorganisms. Due to this disruption, the living organisms cannot replicate themselves
and make us sick if we drink that water. UV water purifiers are safe and effective.

Working:
Ultraviolet or UV energy is found in the electromagnetic spectrum between visible light and x-rays and can best be
described as invisible radiation. In order to kill microorganisms, the UV rays must actually strike the cell. UV energy
penetrates the outer cell membrane, passes through the cell body and disrupts its DNA preventing reproduction.
UV treatment does not alter water chemically; nothing is being added except energy. The sterilized microorganisms
are not removed from the water. UV disinfection does not remove dissolved organics, inorganics or particles in the

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CITS : E & H - Electronics Mechanic - Lesson 160 - 179