Disinfection – UV
One of the application of water desalination is the disinfection of wastewater into the polymer membranes.
Purposes of pre-treatment of water in reverse osmosis system
One of the most important adverse events occurring during reverse osmosis systems is membrane fouling. for the purpose of Fouling, sticking substances such as mud and clay, sand, suspended solids, biological sludge, algae, silica, iron clusters, to the surface of the membrane or, worse, to penetrate into their cavitie.s the “fouling” phenomenon usually occurs in the primitive membranes of the first stage of the reverse osmosis system and gradually extends to the later membranes
The factors causing fouling in reverse osmosis membranes can be classified in the following three categories:
- Organic materials
One of the most important and most difficult issues to be expected in RO systems is microbial growth at the membrane surface. sedimentation due to the presence and growth of these microbes is attributed to biological obstruction. all industrial and natural water purification units have a wide range of microbes including bacteria, protozoa and algae. these organisms accumulate significantly in the form of microbial materials and grow in mud at the surface of the membrane. the accumulation and growth of microbial substances may develop rapidly, and leading to reducing flow rate through the membrane. the accumulation of microbial materials at the surface and sedimentation in the membrane, it may be very difficult or impossible to remove them.
Reducing biological activity of microorganisms: Chlorination is one of the methods for controlling biological obstruction.
Cellulosic acetate membranes (CA) can resist at high levels of chlorine only for a short time. however, polyethylene (PA) cannot tolerate tangible quantities of chlorine. if chlorination is used in RO systems equipped with a PA membrane, chlorination, chlorine reduction should be applied (by using carbon filters and sodium sulfite injection).
disinfection by using ultraviolet light is fast, which reduces the biological activity of microorganisms and effectively eliminates microbial contamination without adding anything to water. Therefore, further steps to remove the remaining free chlorine are eliminated. Ultraviolet (UV) disinfection is a beneficial and effective way to remove bacteria in reverse osmosis water systems.
UV system in sweetener projects is usually used under pressure.
DUV and DUV / Pro (refer to Technical Data Sheet) are among the products under pressure from LIT.
Some of the projects that are accomplished by LIT shown as per following items.
Romania with a capacity of 36,000 m3 / day
China with a capacity of 60,000 m3 / day
France with a capacity of 36,000 m3 / day