Liquid purification or separation – Processes – Chemical treatment
Patent
1987-10-14
1989-02-14
Hruskoci, Peter
Liquid purification or separation
Processes
Chemical treatment
210754, 210756, 210760, 210143, 210169, 210192, 210199, 210206, C02F 178
Patent
active
048044784
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method of and arrangement for treatment and disinfection of swimming and bathing reservoir water with the use of chlorine and ozone and deals particularly with ozonization of natural water.
The treatment of swimming and bathing reservoir water, which will be referred to herein below shortly as bathing water, has the object of guaranteeing at any time in the reservoir a water quality which excludes an infection risk for the bathers. For this purpose not only sufficiently high disinfection action must be maintained in the bathing water, but also it is important that the water outside of the reservoir is continuously freed from dissolved and undissolved impurities and microorganisms contained in the bathing water. For providing this water treatment outside of the reservoir, the reservoir water is continuously circulated, the withdrawn natural water is purified, disinfected, and supplied back into the reservoir with addition of a surplus of a disinfection medium as pure water. The relations here are very complex since the "swimming bath" system is influenced by a plurality of parameters which will not and cannot be discussed in their entirety. This problem is discussed in several publications, for example "KOK-Richtlinien fuer den Baderbau", 2. Auflage (1982), W. Tummels Verlag, Nurnberg; W. Roeske, "Schwimmbeckenwasser", Anforderungen-Aufbereitung-Untersuchung, Verlag O. Haase, Lubeck (1980); and especially in"Deutsche Norm DIN 19 643 Aufbereitung und Desinfektion von Schwimm- und Badebeckenwasser", April 1984, developed from Normenausschuss Wasserwesen in DIN Deutsches Institut fur Normung, in which a full list of further literature is presented.
A partial review of the requirements in accordance with DIN 19643 as to the water condition of the bathing water and to conventional steps for obtaining the desired quality of the reservoir or bathing water is presented later in Table 1.
As mentioned the disinfection is of special importance for the treatment of swimming reservoir water. A good disinfection agent must rapidly destroy or deactivate pathogenic germs in water and maintain the number of germs as low as possible. The bathing water must have a colony number of at most 100 per ml and Escheria coli bacteria (E. coli) as indicator germs for fecal impurities must not be detectable. In the ideal case the disinfection agent must be algicidal, fungicidal, bactericidal and virus deactivating, or in other words have a wide action spectrum. It should be taken into consideration (as disclosed in the publication Roeske, mentioned herein above, pages 204 et seq.) that the action of the disinfection agent must not only provide a direct chemical influence upon the microorganisms, but must also produce and maintain a redox potential in water, at which the microorganisms cannot survive. A certain redox system with a limited redox potential range and a certain pH value is present in the cell of a microorganism. When the redox potential of the surrounding water exceeds a limiting value of this range, it affects the metabolism of the microorganism, making it incapable of maintaining life. A "safety" redox potential for swimming bath water has a value of above approximately 600 mV for killing after an operating time of below one minute.
The disinfection agent must be used in a minimum concentration, so that it does not corrode the mechanical devices and does not have toxic or damaging side effects upon the bathers. It must be taste and odor-neutral, sufficiently stable in water for producing a sufficient and prolonged germ destroying action (depot action), must provide in addition to the disinfection action also an oxidizing action upon the materials contained in the water without producing damaging compounds with it, must not additionally load the water in that the reaction products must biologically decompose, must be produced with economically acceptable costs, and moreover must allow reliable, safe and accurate dosing and be reliable, simple and fast for dete
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Hruskoci Peter
Striker Michael J.
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