UV Disinfection and Sterilisation for Domestic and Industrial Water Treatment

UV disinfection and sterilisation for domestic and industrial water treatment Major Benefits of UV Disinfection Ultraviolet disinfection has many advantages over alternative methods. Unlike chemical biocides, Ultraviolet disnfection and sterilization techniques do not introduce toxins or residues into process water and does not alter the chemical composition, taste, odour or pH of the fluid being treated. This is one of the most important aspects of all ultraviolet disinfection  systems. This feature is especially important in the food and dairy industry where the chemical dosing of incoming process water can compromise flavours and changes the physical chemical properties of the food products. Ultraviolet UV treatment can be used for primary water disinfection or as a back up for other water purification methods such as carbon filtration, reverse osmosis or pasteurisation. As UV has no residual effect, the best position for a treatment system is immediately prior to the point of use. This ensures incoming microbiological contaminants are deactivated and there is a minimal chance of post-treatment contamination. Many users install UV systems after filter beds and storage tank outlet valves to reduce the likelihood of contamination from these sources. A typical UV disinfection system consists of an ultraviolet UV lamp housed in a protective quartz sleeve, which is mounted within a cylindrical stainless steel chamber. The liquid to be treated enters at one end and passes along the entire length of the chamber before exiting at the other end. Virtually any liquid can be effectively treated with UV, including mains water, filtered process water, milk, sugar syrups and effluent. Ultraviolet disinfection systems have many uses in commercial, industrial and domestic applications. Ultraviolet lamps, germicidal bulbs and ultraviolet disinfection lamp are widely accepted in applications such as: Water purification, UV disinfection and sterilisation for domestic and industrial water treatment. Domestic, commercial and industrial wastewater treatment Municipal sewage and wastewater treatment Aquaculture, fish farming, oyster farming water treatment, disinfection and purification Disinfection and sterilisation of potable drinking water Disinfection and sterilisation of industrial process water Curing of glues and adhesives Curing of inks on continuous web, screen printing, lithographic and large format printing processes Air purification in ducting of factories, food-processing plants, nursing homes, and hospitals Ozone generation Surface disinfection, food conveyor sterilisation Principle of Operation Ultraviolet disinfection systems typically utilize thin cylindrical bulbs capable of generating narrow band wavelength UV light in the 254 nm range, placed in close proximity to high-purity glass tubes through which the water flows. The unit must be sized to provide adequate dosage at the specified flowrate. The water to be treated must be sufficiently free of turbidity (sediment), iron, manganese and any colorant that could affect transmission of the 254 nm UV light. Manufacturers' specifications should be consulted. Limitation of Use The UV water disinfection system NOT intended for the treatment of water that has an obvious contamination or intentional source, such as raw sewage, nor is the unit intended to convert wastewater to microbiologically safe drinking water. Water Quality (in) Water quality plays a major role in the transmission of germicidal UV rays. It is recommended that the water does not exceed following maximum concentration levels Maximum Concentration Levels (Very Important) Iron≤ 0.3ppm(0.3mg/L) Hardness≤ 7gpg(120mg/L) Turbidity≤ 1NTU Manganese≤ 0.05ppm(0.05mg/L) Tannins≤ 0.1ppm(0.3mg/L) UV Transmittance≥ 750‰ Effectively treating water with higher concentration levels than listed above can be accomplished, but may require added measures to improve water quality to treatable levels. If, for any reason, it is believed the UV transmission is not satisfactory, contact the factory. UV wavelength (nm) DOSAGE is the product of intensity & time Dosage=intensity*time=micro watt/cm2*time=microwatt-seconds per square centimeter (μ W-s/cm2) Note: 1000μ W-s/cm2=1mj/cm2(milli-joule/cm2) As a general guideline, the following are some typical UV transmission rates (UVT) City water supplies850-980‰ De-ionized or Reverse Osmosis water950-980‰ Surface waters(lakes, rivers, etc)700-900‰ Ground water(wells)900-950‰ Other liquids10-990‰ Technical parameters: modelProcessing capacity (Ton/Hour)power (W) inlet and outlet(inch)working pressure (Kg/cm 2 )malfunction alert for UV lampreactor dimension (cm) L×W×Hdimension of panel(cm)anchor bolt  (cm)overall weight (Kg)YLCn-0050.3161/2"6matched30×6×11  5YLCn-0081251/2"6matched47×6.3×11  10YLCn-0502401"6matched100×9×20Φ8.9×25(diameter×length)69×4×Φ125YLCn-1506801+1/4"6matched100×11×2369×4×Φ130YLCn-20081201+1/2"6matched100×15.9×30Φ8.9×45(diameter×length)69×7×Φ135YLCn-300121602"6