UV systems for chlorine reduction

In various industrial water treatment systems, residual Chlorine is usually removed using activated carbon filters (GAC systems).

Which units can you use for this application:

440
SMP

However, the activated carbon bed is a breeding ground for bacteria, which makes the activated carbon filter particularly exposed and vulnerable to micro-organisms.

Furthermore, the activated carbon bed reduces, by adsorption, the level of organic material in the stream but by retaining it serves as a nutrient for the bacteria, which then have a way to multiply. The increase of the bacteriological level leads to the problem of packing of the activated carbon bed.

UV technology can be used as an alternative to activated carbon for the destruction of free chlorine.

UV technology is an environmentally friendly technology, and this aspect is often taken into consideration when weighing the different options available.

SITA that has been in the market since 1982 offers suitable solutions for chlorine destruction and reduction using UV equipment.

The use of UV technology for the elimination of residual chlorine and chloramines has several advantages.

UV irradiation does not alter the characteristics of the water, which therefore remains unchanged in colour, odour, chemical composition, taste, and also does not produce under products.

The UV process is incredibly fast, efficient, and environmentally friendly.

The use of UV rays for the elimination of free chlorine in water has many proven advantages:

Simultaneous chlorine reduction and bacteriological reduction of more than 99.99%;
Continuous system operation with minimal maintenance and pressure drop of only 0.02 bar;
Many water treatment systems include Reverse Osmosis systems, which normally use thin-film membranes because of their recognized efficiency. However, this type of membrane is not compatible with high levels of chlorine. Therefore, a UV system can be used upstream of such membranes to remove chlorine and thus make the use of activated carbon unnecessary or reduce it, thereby also decreasing the risk of bacterial growth and decay of the membranes themselves.

Dechlorination by UV also avoids the following problems arising from the use of activated carbon:

The risk and expense related to bacterial overgrowth in the water treatment system;
The activated carbon bed is one of the biggest environmental hazards and as such carries high transportation, maintenance and disposal costs;
High pressure drop and regeneration costs.

Some application examples:

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