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q1: what are the main advantages of uv water treatment?
ultraviolet (uv) disinfection is a widely recognized and proven water disinfection method. this is a physical treatment, not chemical, so it will not change the chemical properties of water. ultraviolet rays will not change the color, smell and taste of water, and will not produce harmful by-products.
q2: which industries use ultraviolet water treatment?
almost all industries have uv application cases, and almost all industries can use uv technology for water treatment. examples include microelectronics, life sciences, food and beverages, aquaculture, recreational water and urban drinking water.
q3: a typical uv water treatment unit and its working principle?
a typical uv unit works by irradiating flowing water with uv lamps strategically placed in the processing chamber. although the water stays indoors for only a few seconds, it receives enough ultraviolet dose to kill the microorganisms present in the feed water. a dose of 30mj/cm 2 is sufficient to destroy most aquatic microorganisms. uv treatment requires a fraction of the contact time required by other disinfection methods.
q4.: what is the advantage of uv treatment in the chlorine/chloramine removal process?
for uv disinfection, there are no toxic side effects, because no chemicals are added. the use of activated carbon adsorption or sodium metabisulfite to remove chlorine/chloramine will produce other chemical substances or solid waste. ultraviolet rays are environmentally friendly, while the other two methods are not.
q5. how does uv degrade toc?
185nm ultraviolet light can stimulate the photolysis of water molecules to produce extremely high-energy hydroxyl groups. when toc is completely oxidized, carbon dioxide and water are generated.
q6: why are two different wavelengths used in water treatment?
two different uv wavelengths are used in water treatment: 254 and 185nm. 254nm ultraviolet light is called germicidal light because of its ability to kill microorganisms. it is used to disinfect and destroy ozone. it penetrates the outer cell wall of microorganisms, passes through the cell body, reaches dna and changes genetic material, destroying microorganisms.
ultraviolet light at 185 nanometers carries more energy than ultraviolet light at 254 nanometers. it generates hydroxyl (oh•) radicals through the cracking of water molecules, which are used for toc reduction to decompose organic molecules into carbon dioxide and water.
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