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Sun
rays is the natural source of Ultraviolet. UV has the
germicidal capability and is known for its disinfectant
effects.
The main sources of UV are:-
(1) Natural - direct from sun.
(2) Artificial - they comprise of a variety of arc and
incandescent lamps.
UV Disinfection generally employs low
pressure mercury lamps. It generates short waves of UV
in the region of 253.7 nm, which is lethal to
micro-organisms, including bacteria & Virus. Total
Organic Carbon (TOC) in water can also be reduced from
water with 185 nm wave length Ultraviolet. Therefore, UV
is effective for waste water treatment also.
The advantages of Chlorination in UV
System compared to Hitech is tabulated below :- |
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HITECH UV SYSTEM |
CHLORINATION |
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SPEED: |
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Sterilization very quick 2 to 3 seconds
whilepassing through sterilizing
chamber. Ready to use INSTANTLY. |
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Long Storage-contact time 30 to 60 minutes
for effective sterilization. |
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SAFETY: |
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Physical exposure in enclosed cabinet,
completely safe. Nature's way of
purification. |
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Use of hazardous corrosive chemical like
chlorine gas, formation of
organo-Chlorine harmful compounds,
toxic, cancerous. |
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EFFECTS ON WATER: |
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No effect on taste, pH, temp, odour or
chemical composition. Can be used over a
wide range of temp. 5°C to 90°C, pH range. |
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Carcinogenic taste, odour, effect changes in
pH/ temperature. Organic matter residue. |
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COST: |
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Most effective durable, minimal maintenance,
safe economical on demand, disinfection
instant. |
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Expensive to build and Operate, recurring
cost, down time, unsafe, complicated, repeat
chlorination and de-chlorination. |
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REVERSE TREATMENT ETC: |
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No need for any further treatment, Ideal
for point of use, for complete microbial
integrity. No residue or by-product.
SAFE |
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Excessive use of chlorine (more than 2 to 5
ppm residuals) requires further
de-chlorination. It means extra cost and
treatment. Also contaminates entering from
carbon bed add further to the microbial
problem, formation of organochlorine harmful
by-products toxic, cancerous. |
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RELIABILITY: |
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No corrosion due to unique design,
consistent output reliable. |
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Plant corrosion problem. Non-reliability due
to use of bleaching powder, non-reliable,
stability, and low-self life. |
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