UV Disinfection Plant

UV Disinfection Plant

Disinfection is a process in which all micro-organisms (bacteria / virus / cysts etc) are eliminated to make the water fit for drinking and other consumption purposes. MORF INDIA offers a wide range of modular UV systems (Centralized and Point-of-use) to suit the various requirements of customers.

UV light is a natural component of sunlight. These rays are electromagnetic wavelengths of radiation which are just shorter than those of visible lights. UV is a part of the light spectrum which is primarily classified into three wavelength ranges as given below.

UV-C : From 100 nanometers (nm) to 280 nm
UV-B : From 280 nm to 315 nm
UV-A : From 315 nm to 400 nm

Eletromagnetic Spectrum with expanded scale of ULTRAVIOLET RADIATION

Illustration 1

Illustration 2

Out of these, UV-C is germicidal and hence it deactivates the DNA of bacteria, viruses and other pathogens and thus destroys their ability to multiply and cause disease. Specifically, UV-C light causes damage to the nucleic acid of micro-organisms by forming covalent bonds between certain adjacent bases in the DNA. The formation of such bonds prevent the DNA from being unzipped for replication and the organism is unable to reproduce.

Higher energy wavelengths of UV rays have the unique ability to destroy harmful micro-organisms in water. UV light destroys these micro-organisms by disrupting their genetic information (DNA) and rendering them harmless.

The degree of UV inactivation is directly proportional to the UV dose applied to the water. UV dose is the product of UV light intensity and exposure time (HRT) and is expressed in mJ/cm2. NSF international has established a UV dose of 30,000 mw-sec/cm2 as the minimum UV dose required to ensure a safe level of disinfection.

UV technology is a non-chemical approach to disinfection where nothing is added. This process is simple, inexpensive and requires very low maintenance.

The dosage of UV is measured in microwatt seconds per square centimeter. The higher the microwatt, the higher the dosage, the longer the exposure time the higher the dosage. UV systems generally employs low pressure mercury vapour lamps. They generate short wave UV in the region of 253.7 nanometers which is lethal to micro-organisms.

UV rays are used to disinfect water by inactivating harmful micro-organisms through damaging their nucleic acid. If not inactivated, bacteria will form colonies, viruses form plagues and protozoan cysts attack a host or tissue culture. These micro-organisms cause gastroenteritis, bacillary dysentery, amoebic dysentery, hepatitis and much more.

In the normal treatment process, the water after passing thro Sediment Cartridge and Carbon Cartridge is sent into a disinfection unit (UV) for complete sterilization. UV Sterilizers are built on the germicidal property of UV Radiation at 2537 angstorm unit capable of destroying the DNA of bacteria, virus, algae, fungi and other micro-organisms. These units are built with high efficiency UV lamps surrounded by quartz glass sleeves to isolate the bulbs from direct water contact. The quartz sleeves which are physically and chemically inert also ensure very high transmission of UV energy with lesser losses.

In hi-volume units, turbulence is created in the water flow to achieve full exposure to the UV rays.

UV systems, although complex, have no moving parts and requires minimum power to operate and is therefore economical. The life of the UV lamp is calculated based on the burning hours.

Illustration 3

Since suspended particles present in the water tend to deflect the UV rays, the efficacy of the UV disinfection unit depends on the physical clarity of the water. Hence it is recommended to have an effective filtration system (Macro and Micro) prior to the UV plant.

UV systems will have to be used in water with ambient temperature. Depending on the usage and intended applications, UV systems can be supplied with multiple UV lamps in parallel or series.

MORF INDIA offers UV units with the finest Stainless Steel (SS 304 / SS 316) electro-polished internally and externally for longer durability.

Advantages of UV System

  • Environmentally clean technology since no chemicals are required for the process
  • No known toxic or significant nontoxic by-products are formed during the process
  • Leaves no smell, taste or any other residual effects in the purified water
  • Requires relatively very little contact time
  • All pathogenic micro-organisms are effectively inactivated
  • UV process does not alter or affect the minerals in water
  • Apart from disinfection, UV is also used for reduction of TOC, Ozone destruction and Tertiary waste water treatment
  • User-friendly and simple operations
  • Minimal system maintenance requirements
  • Reduced capital costs

General Applications

  • Point-of-use system for domestic and customized requirements
  • Aircrafts, boats and such other vehicles
  • Schools and hotels
  • Ice-making
  • Brewery, winery, soft drinks, fruit drinks
  • Dairy processing,
  • Pharmaceutical production
  • Laboratories, hospitals and clinics
  • Pathology labs and kidney dialysis
  • Cosmetic and electronic production
  • Pre-treatment and Post-treatment to packaged RO plants.