UV water purification causes cancer

Disinfection of swimming pool water - chemical-free with ozone and UV

(30.11.2010) Chlorine is an effective bacteria killer, but scientists have long been warning of the negative effects on human health. A team of researchers from the Center for Research in Environmental Epidemiology in Barcelona has currently even come to the conclusion that swimming in chlorinated indoor or outdoor pools would increase the risk of developing cancer. The researchers were able to identify more than 100 chemical intermediates in chlorinated pools. "Chlorine is a highly active microbe killer and reacts with a large number of organic substances. This also includes flakes of skin, sweat and urine," said pool specialist Rudolf Wagner from the water workshop in a recent interview with the Pressetext news agency, adding: "There is an alternative to chlorine Ozone. This oxidizing agent is far less potent and less reactive. "

One of the challenges in swimming pools is the reduction of chlorine and trihalomethanes (THMs), which are harmful to health, which occur as by-products in the disinfection of pool water. Against this background, the water technology company Berkefeld offers a new, chemical-free water treatment system with the disinfection system BerkeDES DUO. By combining the oxidizing effect of ozone with the disinfecting effect of ultraviolet light, this system sees itself as an economical and at the same time environmentally friendly option. It leads to a reduction of the bound chlorine and the THM's and thus reduces the negative chlorine side effects - of which the chlorine smell is probably the most harmless.

In the process, air is first irradiated with ultraviolet light with a wavelength of 185 nm. This converts the oxygen in the air into ozone. Ozone leads to the oxidation of the pathogens present in the water such as bacteria, viruses and algae as well as other disruptive substances in the water such as nitrite, cyanides and odorous substances. This air mixture is fed into the water circuit via a venturi injection system.

In the reaction chamber, the water and air mixture are treated again with UV light, this time with a wavelength of 254 nm. This initiates two processes: The ozone in the water is converted into OH radicals and the remaining ozone content is destroyed. OH radicals have the strongest oxidative power and can reduce a large number of substances that are difficult to break down. This ensures efficient killing of germs and pathogens.

By the way: The researchers from the Center for Research in Environmental Epidemiology do not advise against swimming in pools, but want to achieve changes in bathroom hygiene and encourage swimmers to wash themselves thoroughly with soap before taking a bath. "If you take a shower in front of the bathroom, you reduce these reactions by a power of ten," emphasizes Rudolf Wagner from the water workshop.

Further information about BerkeDES DUO can be obtained by Email to Berkefeld (now: Veolia Water Technologies) be requested.

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