process of water purging must be efficient(as simple as possible), environmentally friendly and should not consume
many resources(such as energy and chemical compounds).
all other water treatment stages, water will be filtered. The main scope of
ultrafiltration is to eliminate the macromolecules(algae, organic molecules,
germs, bacteria, viruses), that could cumber the Reverse Osmosis process. This
action doesn’t require a high amount of energy and the water becomes clear at
This stage can not, however, get rid
of dissolved salts, nor of ionized contaminants and solvents, so that’s why the
other stages are still very important.
In this stage, dissolved minerals, metals, salts, fluoride and even
pyrogens are eliminated. At low pressure, the process generates a relatively
big amount of waste water; However, the water loss can be minimized by using
high pressure instead of a lower one.
Reverse Osmosis is efficient when
the entering water is clear and free of microorganisms(these two aspects are
achieved in the Ultrafiltration).
After this stage, water loses almost
all its minerals and it has acid pH.
3.UV Light Action
This stage is also known as photooxidation and it requires
a small amount of energy. It separates electrons from the molecules and it is
creating free radicals that alter the structure of toxic agents.
After stage 1 and 2 of water treatment, water is
clear, so the UV light can reach every corner of the water tank. If there is
still some bacteria left in the water, it is deactivated by this process.
This water treatment technic is used as a polishing
process after Reversed Osmosis. Electric current is applied in order for the
ions to move toward the electrodes(cathode and anode). The ions don’t arrive to
the specific electodes because they can’t get through the ion-selective
membrane that is fixed in their way. They concentrate on one side of the
membrane and they are eliminated from the system.
becomes ions-free and it splits into OH- and H+ and the water treatment process
This process eliminates organic chemicals(and
carbon-based substances) and even VOCs. It also gives the water a natural good
taste and odors are removed.
The AC beds might be able to shelter bacteria, that’s
why the microorganisms were killed before reaching this module (the
deactivation of the bacteria was done in the ultrafiltration and UV light