Water disinfection

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Water disinfection protects the plant or the process from microbial pollution. Disinfection also prevents bacterial growth in pipes and equipment.

Pathogenic microorganisms can have harmful consequences on human or animal health. This is why the plant’s water resources for use in an industrial process must be secured.

Elmatec adapts its disinfection technologies to the manufacturer’s application and needs.

UV disinfection

UV disinfection in water treatment is a proven and widely used process throughout industry.

Various applications include:

  • Water disinfection at the plant’s inlet
  • Disinfection of process and ingredient water
  • Disinfection of rinsing or cleaning water
  • Recycling of process water
  • Equipment protection (reverse osmosis, filtration)
  • Disinfection of purified water (producer and distribution loop in the pharmaceutical industry)
  • Maintaining water quality during storage
  • Bottled water
  • Sweetened beverages (juices, sodas, syrups)
  • Alcoholic beverages (beer, wine, spirits)
  • Dairy process
  • Fruits and vegetables

UV generators can be easily built into your process with hygienic designs as required.

Germicidal property of UV-Cs

UV light consists of electromagnetic waves with wavelengths ranging from 10 nm to 400 nm:

  • UV-A (long UV): 315-400 nm
  • UV-B (medium UV): 280-315 nm
  • UV-C (short UV): 200-280 nm
  • UV in a vacuum: 10-200 nm*

UV light is effective in eliminating pathogenic microorganisms. The highest germicidal effect of UV-C is observed at a wavelength of 254 nm. UV light penetrates the cell wall of the microorganism and alters its DNA. The microorganism is “inactivated”, preventing it from replicating or infecting. UV light kills bacteria, viruses, spores and other pathogens.

Unlike chlorine, UV also inactivates protozoa such as Cryptosporidium and Giardia. The application of UV light creates an instant reaction.

Mercury vapor lamps are used to produce UV-C rays. Such lamps may be low pressure or medium pressure.

The UV generator consists of one or more lamps that are placed in quartz sheaths. The quartz sheaths offer thermal and electrical insulation from the water.

The following parameters must be taken into account:

  • flow rate, which determines the water’s duration of exposure to the radiation
  • water quality, i.e. turbidity, metals and organic matter to determine transmittance
  • UV-C dose delivered, which defines lamp type and power

 

The advantages of UV

  • It does not change the chemical composition of the water
  • It does not alter the organoleptic characteristics of the water
  • More effective than chlorine on certain viruses and protozoa
  • Fast-acting, very short contact time (a few seconds)
  • Easy-to-use technology and compact installation
  • No chemicals required
  • Effectively prevents the formation of toxic by-products that are harmful to human health (unlike chlorine)
  • No risk of under or over-dosing
  • Improves user safety as UV requires no transportation, storage or handling of toxic or corrosive chemicals
  • Low operating and maintenance costs

UV can also be used for ozone dechlorination or TOC reduction.

Ozone disinfection

Various applications include:

  • Disinfection of process water
  • Disinfection of rinsing or cleaning water
  • Disinfection of ultra-pure water
  • Disinfection of purified water (storage and distribution loop in the pharmaceutical industry)

 

Ozone, a powerful oxidizing agent

Ozone is a powerful oxidizing agent and disinfectant. It destroys all microorganisms and particularly water-borne pathogens.

Ozone is one and a half times more powerful than chlorine and is one of the strongest oxidizing agents on the market.

Ozone is produced on site. Ozone, however, is unstable and does not persist over time, so it cannot be stored. Ultrapure water is used to produce ozone through electrolysis of the water or by corona discharge.

 

The advantages of ozone

  • Ozone does not lead to the formation of by-products, unlike chlorine which can create dangerous chlorinated by-products such as trihalomethanes (THM)
  • Ozone does not require the use of chemicals, and therefore the associated handling and storage risks are limited
  • Inactivation of protozoa, unlike chlorine
  • Easy sanitization of a distribution loop by stopping the ozone destroyer.
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