DE2231025A1 - METHOD AND DEVICE FOR THE PROCESSING OF ENVIRONMENTAL WATER IN POOLS - Google Patents

Description

AUGUST KLÖBER APPARATEBAU U.> äD 'YASSHRaUFBEREITÜNC GMBH PATENT DEPARTMENT

6700 Ludwigshafoii / Rhine, Post; 21 01 6% remote call (0521) 5903 3

May 12, 1972 TPE / P / Dy

- KS 507 -

Method and device for the treatment of circulating water in bathing pools

The present invention relates to a method and a device for treating circulating water in Bathing pool by filtration.

For many years, ozone has been used in particular for cleaning, fining and disinfection due to its high normal potential used with success in drinking and industrial water. Recently, ozone has also been used in bathing pool water treatment Entrance found. In this sector of water treatment, it is used after the pre-cleaning of a pool circulating water applied by filtration as a disinfectant.

As an ideal gas, ozone has only a small and temperature-dependent one Water solubility. The distribution factor, i.e. the ratio of mg 0, / 1 water: mg 0 ^ / 1 gas, has roughly the following values:

at 2O ⁰ C = 0.28
at 30 ° C = 0.18
at 40 ⁰ C = 0.12.

According to this, the water-soluble

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ozone and, under normal conditions, the gas leakage to the atmosphere increases.

The low, temperature-dependent water solubility and a certain toxicity of ozone in higher concentrations limit its use as a disinfectant for pre-cleaned, at 20 - 35 ° C temperature Bathing pool water heavily. Additions of ozone that lead to an excess of 0.1 mg 0.1 / l water can be released above the water level of a swimming pool lead to discomfort, especially due to irritation "of the mucous membranes, for bathers.

On the other hand, ozone doses of over 0.1 mg are 0 ^ / 1 Bathing pool water is desirable and necessary in order to break down and kill disruptive organic impurities to ensure disease-causing bacteria and viruses that are brought into the pool water by bathers. It has been proven that every bather, intentionally or unintentionally, has about 50 ml of urine, that is approx up to 1.5 g urea, enters into a bathing pool water. In practice, this leads to concentrations between 0.2 to 0.6 mg urea per liter of bathing pool water. As for the stoichiometric conversion of 1 g of urea 0.8 g of ozone are required when treating bathing water with ozone 0.5 mg / 1 water required. The entry of organic matter into a bathing pool is about 2 - 4 g / Person and cbm as KMnO ^ consumption, with ozone additions of

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more than 1 mg / 1 water are necessary to remove around 75 % of these disruptive substances.

It is known that ozone can also be used as a blocking aid for the treatment of drinking water before filtration. The main aim of this is to remove unpleasant tastes and odors. In contrast to this contaminants of an organic nature that have been introduced from the pool water must always be renewed and in varying amounts eliminated v / earth. Due to the different tasks, it was by no means obvious to use the experience on the To use the area of drinking water treatment for the present case.

The applicant has now found a method which, in addition to economical operation, provides optimum cleaning and disinfection performance while eliminating the previously existing hazard source of ozone gas leakage from the pool water. The inventive method is applicable everywhere where _s is Badebeckemfasser whatever origin and temperature to clean without side effects and disinfected, and it is characterized in that the bath water is subjected both before and after filtration an ozone treatment.

Studies of bathing pool water showed that depending on Exposure (bathing operation) Redox potentials at the pool outlet between a minimum of 250 and a maximum of 550 mV (platinum-calomel electrode) are present. Such polluted water becomes

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treated with ozone and given a reaction time between 1 and 3 minutes, so provides there is an increase in the redox potential and the destruction of those mainly resulting from urine ingestion Solid nitrogen compounds. In addition, the existing colloidal substances are precipitated and can e.g. retained in a sand filter. This leads to a reduced KMnO ^ consumption of the treated in this way Water. This processing stage therefore represents the cleaning stage, although here in addition to physico-chemical Processes of a biological nature also take place in the sense of killing microorganisms.

This cleaning stage is followed in the 2nd stage by disinfection with ozone, in concentrations between 0.06 and 0.1 mg / 1 ozone, resulting in redox potentials between 750 and 850 mV leads, whereby within a few seconds a complete killing of all pathogens present in the water is achieved. The inevitable outgassing of According to the method, ozone at the water surface is within the tolerated limits.

The effect of the method according to the invention becomes clear when values are established which have been determined in detailed investigations were opposite. In an eading operation with heavily fluctuating loads on the indoor pool, the Up to now common method of bath water treatment - filtration + ozonation - and the inventive method - pre-ozonation + Filtration + post ozone - checked. The data of this sub-

- 5 -.
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search are shown in Table 1: Table 1:

Swimming pool volume Flow rate of the circulation

Data of the raw or top-up water:

= 250 in = 320 nr ⁵ = 160 m ³ / h

Visitors on the day of the investigation 332 people

pH

m-value

° d GH

° d KH

KMnO] J consumption

Chlorides

Nitrates

Nitrites

ammonia

= 7.4

= 5.8

= 17.7

= 16.2

= 4.7 mg / l

= 24.5 "

= 20

= Tracks "

= n.n. "

Under A. a I a 2 b 1 B. b 3 data 7.5-7.6 7.5-7.6 7.5-7.6 b 2 7.5-7.6 PH value 26th 26th 26th 7.5-7.6 26th Temp. ⁰ C 6.7-10.5 5.2-8.6 6.7-10.5 26th 3.2-4.5 KMnOij consumption
mg / 1 35.5 35.5 35.5 3.2-4.7 35.5 Chlorides, mg / 1 32 - 40 32-36 32-36 35.5 32-36 Nitrates, mg / 1 0.05-0.12 0-0.05 0.05-0.10 32-36 0.00 Nitrites, mg / 1 0.05-0.25 0-0.12 0.05-0.15 0.00 0.00 Ammonia, " 0.05-0.40 0-0.25 0.05-0.25 0-0.05 0-0.15. Urea," 0 0.08-0.2 0 0-0.15 Ό, 0 £ -0,: 10 Ozone, " 25O-55O 65O-72O 380-550 0.3-0.6 700-7: 30 Redox pot .; mV 2IO-432O 8-100 165-200 72O-85O 0-2 Germs / ml 3-88

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A) conventional ozonation = filtration + ozonation a 1) before filtration and ozonation (pool water) a 2) after filtration and ozonation

B) according to the method = pre-ozonation + filtering + post-ozonation

. b 1) before treatment (pool water) b 2) after pre-ozonation and filtration b 3) after post-oozing

The values in Table 1 clearly show the superiority of the process according to the invention - in terms of its cleaning and cleaning Disinfection performance evident.

The investigations surprisingly showed that the disinfection capacity can be increased significantly if, instead of the laminar longitudinal flow of a swimming pool, a turbulent flow entering from the side with 30 to 50 % overflow of the pool water over the pool channel is selected. Under these conditions, the freshly prepared and post-oozed water quickly reaches the mouth and nose of the bathers and is quickly fed back into the circulation system. Strong recontamination of the water with a relatively long period of time in the basin is eliminated in this way.

Since the ozone consumption of a bathing pool water is heavily dependent on its pollution, a constant setting of the "^;" or- and na ^ vosonung would increase the risk of over ™

"" 7 _

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or underdosing with all the resulting disadvantages. It is therefore necessary that the Adapt the capacity of the ozone aggregates used to the changing water quality. This also in order to avoid that ozone breakthroughs from pre-ozonation strike through the filter, e.g. sand filter.

The device on which the process invention is based switches off all negative effects that arise with regard to otherwise result in over or underdosing of ozone, completely. Based on Fig. 1, the inventive Process and device for cleaning and disinfecting bathing pool water with ozone are described:

The contaminated bathing pool water A flows through a hair and fiber catcher 1 to separate coarser contaminants and is pressed by the feed pump 2 through the treatment system. The first treatment for cleaning the pool water with ozone takes place in the indirect process, in such a way that an injector 3 », which ^{takes part of the pool water from the line 5 via the booster pump 1} I, sucks in ozone gas from the ozone unit 6 via the flow meter 7. A highly concentrated ozone solution thus arises within the injector 3, which is mixed in countercurrent to the main stream of the pool water in the inoculation piece 8. In order to obtain an intensive mixing of the partial water flow loaded with ozone and the bathing pool water main flow,

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the two water flows are increased to kinetic energy through the corresponding pipe dimension of the inoculation piece 8 tuned from 400 - 700 kpm. This will be a high The efficiency of the ozone usage is guaranteed and the ozone reacts momentarily with the disturbing water constituents and oxidizes them.

In order to ensure an optimal reaction time, the pre-ozone bathing pool water remains inside the reaction tank 9. Depending on the operating conditions, the reaction tank 9 is dimensioned in such a way that it allows the treated water to stay for a minimum of 60 seconds and a maximum of 180 seconds. Excess gases are discharged via the automatic vent valve 10 of the reaction container 9, the treated water reaches the measuring cell 12 via the "line 11", which consists of a redox generator or ozone excess generator or electrode chain that continuously electrochemicals the redox potential or the ozone excess measures and transmits the measured value to the two-point controller, e.g. drop arm controller 13. The drop arm controller 13 equipped with minimum and maximum contact in turn transmits the measured value to the transformer servomotor I ¹ I of the ozone unit 6. If the value measured by the measuring cell 12 differs from Setpoint value of drop bracket regulator 13, then transformer servomotor lh regulates the electrical voltage of ozone unit 6 upwards or downwards until there is agreement.

3 (Γ9% σ8 / 074 8

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According to practical experience, the value to be measured at the measuring cell 12 should be from 65O to 710 mV or from 0.05 to 0.2 g 0, / nr water. Under- or overdosing of ozone are switched off if these values are observed.

The swimming pool water provided with the above-described, slight excess of ozone then flows into the closed one Pressure filter l6 with automatic vent valve 10 for the purpose of separating out the filterable form interfering substances too.

The pre-ozoned and filtered bathing pool water is now subjected to post-ozoning for disinfection, and again an injector 17 takes ozone gas from the ozone unit 19 via the flow meter 18 and the pressure booster pump 20-den Injector 17 feeds a partial flow from line 21. The ozone partial water flow is at the injection point 22 with the bathing pool water main stream with a kinetic energy of 400 - 700 kpm optimally mixed, after which the Water in the reaction tank 23 with an automatic vent valve 10 entry. The volume of the reaction container 23 is to be chosen so that there is a residence time of a minimum of 18 seconds and a maximum of 60 seconds before entering the measuring cell 24. The measuring cell 24 is like the measuring cell 12 designed as a redox or ozone excess measuring chain and ultimately controls the transformer servomotor via the two-position controller 25 26 of the ozone generator 19 with electrical power meter 27

According to practical experience, the one at the measuring cell should

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value used for measurement between 750 and 850 mV or 0.06 to 0.1 g Ο -, / ηι water. Deviations up or down are corrected by the transformer servomotor via the two-position controller 25.

The water pre-exposed and filtered for cleaning and post-disinfection water leaves the area of the at B Processing plant and flows to the bathing pool.

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Claims (3)

- KS 507 - - Claims (Ώ Process for the treatment of circulating water in bathing pools by filtration, characterized in that the water both before and after filtration is subjected to an ozone treatment. 2. The method according to claim 1, characterized in that the pre-ozonation is carried out with ozone concentrations which, after a reaction time between 60 and 180 seconds, has a redox potential between 650 and 710 mV or ensure an excess of ozone between 0.05 and 0.20 g / m water. 3. The method according to claim 1 and 2, characterized in that the post-ozone is carried out with ozone concentrations which, after a reaction time between 18 and 60 seconds, a redox potential between 750 and 850 mV or an ozone excess between 0.06 and 0.10 g xn ^J V / ater guaranteed. ¹ I. The method according to claims 1 to 3 »characterized in that the pre- and post-ozonation takes place indirectly and during the mixing partial water flow (ozone solution); bathing pool water main flow the kinetic energy for optimal utilization of the ozone used is 500 kpm and the toilet water flow is separated from the bathing pool water main flow . . Device for performing the method according to 3 0 9 H IJ a / U 7 4 8 - KS 507 - Claims 1 to k _y characterized by the combination of the following elements: ozone units (6, 19) with flow meter !! (7 ₃ 18) as well as transformer servomotors (1-M, 26), Oaoninpfstellen (8, 22), reaction containers (9, 23), redox potential measuring devices or ozone excess measuring cells (12, 2 ¹ I) ₃ with two-point regulators (13, 25), which associated Trans formatorenstellmotore (1 ^ 1, 26) of the ozone units (6, 19) and injectors (3, 17) and booster pumps ('}, 20) to generate highly concentrated ozone solutions. 6. Apparatus according to claim 5 _S, characterized in that it also has a power meter (15 »27). 3 U 9 l < U ü ¹ / U 7 U Ö