UV dose definition

UV dose means the units of intensity of ultra violet light that is required to kill bacteria and viruses present in the effluent;
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UV dose means the UV energy per unit area incident on a surface, typically reported in units of mJ/cm2 or J/m2. The UV dose received by a waterborne microorganism in a reactor vessel accounts for the effects on UV intensity of the absorbance of the water, absorbance of the quartz sleeves, reflection and refraction of light from the water surface and reactor walls, and the germicidal effectiveness of the UV wavelengths transmitted.
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Examples of UV dose in a sentence

  • UV dose is the amount of UV energy per unit area that falls on a surface.

  • Table 4-7 Recommended UV dose for the inactivation of microbes (mJ/cm2; EPA, 2011) Target Log Inactivation Giardia cysts1 1.5 2.1 3.0 5.2 7.7 11 15 22 Cryptosporidium oocysts1 1.6 2.5 3.9 5.8 8.5 12 15 22 “Viruses”1 39 58 79 100 121 143 163 186 Adenovirus type 402 56 111 167 Poliovirus2 7 15 22 30 B.

  • The reactor operation is fully automatic and controlled to maintain required UV dose for the flow rate and water quality conditions as described above.

  • In air and surface disinfection applications UV effectiveness is estimated by calculating the UV dose which will be delivered to the microbial population.

  • The UV dose is calculated as follows: where D is UV dose Ws/cm², I is UV intensity W/cm² and t is exposure time (seconds) For a linear lamp, the UV intensity is inversely proportional to the radial distance from the lamp.

  • To ensure proper inactivation of pathogens, an effective UV dose needs to be calculated based on UVT, UV light intensity and flow rate (exposure time).

Related to UV dose

  • Milk product or "dairy product" means cottage cheese, dry curd cottage cheese, reduced fat cottage cheese, lowfat cottage cheese, cream, light cream, light whipping cream, heavy cream, heavy whipping cream, whipped cream, whipped light cream, sour cream, acidified sour cream, cultured sour cream, half-and-half, sour half-and-half, acidified sour half-and-half, cultured sour half-and-half, reconstituted or recombined milk and milk products, concentrated milk, concentrated milk products, skim milk, lowfat milk, frozen milk concentrate, flavored milk, eggnog, buttermilk, cultured milk, cultured lowfat milk, cultured skim milk, yogurt, lowfat yogurt, nonfat yogurt, acidified milk, acidified lowfat milk, acidified skim milk, low-sodium milk, low-sodium lowfat milk, low-sodium skim milk, lactose-reduced milk, lactose-reduced lowfat milk, lactose-reduced skim milk, aseptically processed and packaged milk, milk products with added safe and suitable microbial organisms, and any other milk product made by the addition or subtraction of milkfat or addition of safe and suitable optional ingredients for protein, vitamin, or mineral fortification. Unless a product is considered a milk product under this subdivision, milk product does not include dietary products, infant formula, ice cream or other desserts, cheese, or butter. Milk products include the following:

  • Aerosol coating product means a pressurized coating product containing pigments or resins that dispenses product ingredients by means of a propellant, and is packaged in a disposable can for hand-held application, or for use in specialized equipment for ground traffic/marking applications.

  • Marijuana product means marijuana as defined in 50-32-101 and marijuana-infused products

  • Biodegradable means degradable through a process by which fungi or bacteria secrete enzymes to convert a complex molecular structure to simple gasses and organic compounds.

  • Marijuana producer means a person who produces marijuana in this state.