Method and system for treating the backwash water of a swimming pool filter

Abstract

The invention relates to a method for treating backwash water of a filter of a swimming pool. The backwash water is passed into a collecting vessel and, in order to decompose organic chlorine compounds, is passed out of the collecting vessel first via a filter comprising carbon fibres. The backwash water is then passed through a desalination stage comprising an ion exchanger.

Description

[0001] BWT Holding GmbH P1502PC00

[0002] Methods and a system for treating the backwash water of a swimming pool filter

[0003] Description

[0004] Field of invention

[0005] The invention relates to a method and a system for treating the backwash water of a swimming pool filter.

[0006] Background of the invention

[0007] Operating swimming pools, especially municipal ones, is costly. Among other things, DIN 19643 stipulates that at least 30 liters of pool water must be replaced with fresh water per bather. Furthermore, operating the necessary filtration systems for a swimming pool is also complex. For example, sand filters are used for filtration, which require regular backwashing.

[0008] During backwashing, the flow direction in the filter is reversed so that the suspended solids filtered out by the filter bed are flushed out. Large quantities of water are required for backwashing larger systems. This backwash water is usually discharged into the sewer system. Depending on the volume of water and the chlorine content, it is often necessary to temporarily store the backwash water until the chlorine content has decreased sufficiently through degassing.

[0009] In addition to water consumption, this usually also results in high energy consumption, as the tap water used as fresh water is generally colder than the desired temperature of the swimming pool water. BWT Holding GmbH P1502PC00

[0010] Object of the invention

[0011] Against this background, the invention is based on the objective of providing an efficient method and an efficient system which enables the treatment of backwash water from a swimming pool in such a way that the treated water can be used as fresh water.

[0012] Summary of the invention

[0013] The object of the invention is already solved by a method for treating backwash water of a swimming pool filter and by a system for treating backwash water after one of the independent sprays.

[0014] Preferred embodiments and further developments of the invention can be found in the subject matter of the dependent claims, the description and the drawings.

[0015] The invention relates to a method for treating backwash water from a swimming pool filter.

[0016] The backwash water is first directed into a collection tank. Preferably, the water is allowed to stand for a while so that suspended solids settle and / or the amount of dissolved chlorine is reduced by outgassing. A standing time of at least 30 minutes, and in particular from 30 minutes to 24 hours, is provided.

[0017] According to the invention, the backwash water is passed through a filter comprising carbon fibers.

[0018] It has been shown that carbon fibers can be combined with organic compounds, especially organic BWT Holding GmbH P1502PC00, with high efficiency.

[0019] Chlorine compounds are decomposed with high efficiency. Such a filter material is described, for example, in document WO 2022 / 152338Al.

[0020] The carbon fibers can be configured as nanotubes. The filter serves as a reaction vessel for the decomposition of organic chlorine compounds. Preferably, the carbon fiber filter is operated at a low overpressure of 0.1 bar, particularly preferably from 0.3 to 0.8 bar.

[0021] The water to be treated is then passed through a desalination stage. The desalination stage is preferably designed as an ion exchanger, in particular as a hydrogen-loaded ion exchanger. The desalination stage can, in particular, be a mixed bed of cation and anion exchangers.

[0022] The residual salt content is preferably adjusted to below 0.5 mg / l, particularly preferably to below 0.2 mg / l, and especially to 0.5 to 0.15 mg / l.

[0023] Compared to the use of membrane technologies, this allows for the efficient provision of desalinated source water that can be used as fresh water.

[0024] In a further development of the invention, the backwash water is passed over a layer filter with activated filter glass and / or activated carbon before being directed over the filter with the carbon fibers.

[0025] The layer filter removes finer particles, especially abrasion from the backwashed filter system of the swimming pool. BWT Holding GmbH P1502PC00

[0026] The activated glass can contain, in particular, sodium oxide, especially 5 to 20 wt%, and / or calcium oxide, especially 5 to 20 wt%. Due to its reactive properties, chloride and bound chlorine are removed. The activated glass can be in the form of a bed of material, preferably with a particle size of 0.4 to 1.2 mm.

[0027] Hydroanthracite granules are preferably used as activated carbon. In particular, hydroanthracite H is used.

[0028] The layer filter can, in particular, comprise at least one activated carbon layer and at least one layer on activated glass.

[0029] In one embodiment of the invention, a coarse filter is provided in front of the layer filter to remove coarser contaminants, in particular particles larger than 5 mm.

[0030] In one embodiment of the invention, an oxidizing agent is added upstream of the carbon fiber filter and / or the layer filter. Chlorine can be used as the oxidizing agent. The chlorine can be added, particularly as a solution, especially as a sodium hypochlorite solution, using a metering pump. The added oxidizing agent improves the degradation of organic compounds in both the layer filter and the carbon fiber filter.

[0031] In a further development of the invention, the water to be treated is disinfected with UV radiation after the desalination stage. BWT Holding GmbH P1502PC00

[0032] For this purpose, a UV lamp with a wavelength of 254 nm can be used, for example. The backwash water treated in this way can be used as fresh water and, in particular, added back to the swimming pool, especially via a surge tank in the pool's water treatment system.

[0033] In a further development of the invention, the turbidity of the source water is measured. The turbidity can be measured, in particular, by means of a UV sensor in the UV irradiation device. The UV sensor simultaneously ensures that the UV irradiation device is functioning correctly.

[0034] If the turbidity exceeds a threshold value, the water is preferably directed back into the collection tank via a return line.

[0035] In a further development of the invention, the layer filter is backwashed, in particular when the turbidity of the source water is above a threshold value.

[0036] The source water collected in a collection container can be used, in particular, for backwashing the layer filter.

[0037] The backwash water from the layer filter is preferably discarded. In contrast to the backwash water from swimming pool filters, this is only a relatively small amount of water.

[0038] The invention further relates to a system for treating backwash water from a swimming pool filter. BWT Holding GmbH P1502PC00

[0039] The system includes a collection tank for the backwash water with a suction device, a carbon fiber filter, and a desalination stage comprising an ion exchanger is arranged downstream of the carbon fiber filter.

[0040] Furthermore, as described above, the system can include a layer filter with activated filter glass and / or activated carbon upstream of the carbon fiber filter.

[0041] According to one embodiment, the system includes a backwashing device for the layer filter.

[0042] Furthermore, as provided in a preferred embodiment, the system can include a UV irradiation stage behind the carbon fiber filter.

[0043] Furthermore, the system can include a sensor for measuring turbidity. This is preferably designed as a UV sensor in the UV irradiation stage.

[0044] The system is preferably designed for a throughput of 10 to 10,000 1 / h, in particular of 50 to 5,000 1 / h.

[0045] Description of the drawings

[0046] Referring to a schematically represented system according to Fig. 1, an embodiment of the method and the system according to the invention will be explained in more detail.

[0047] First, the backwash water to be treated is collected in a collection container 1. This can be, in particular, a basin. BWT Holding GmbH P1502PC00

[0048] The swimming pool and the filters used for the swimming pool are not shown in this illustration.

[0049] Preferably the water is initially left to stand and is then preferably extracted from the water surface via a suction device 2 for treatment.

[0050] The water first passes through a mechanical coarse filter 3, whereby larger particles, especially particles larger than 2 mm, are removed. The coarse filter 3 can, in particular, be designed as a removable sieve.

[0051] The water is then pumped through the by means of pump 4.

[0052] Layer filter 5 is used. Layer filter 5 comprises activated glass granules and activated carbon. This process already removes at least some chloride and bound chlorine.

[0053] The layer filter 5 is preferably flowed through from bottom to top.

[0054] Chlorine is added as an oxidizing agent before layer filter 5.

[0055] In this embodiment, chlorine is added via the dosing pump 6, which delivers a chlorine solution 7 to the water via an injector 20.

[0056] After the layer filter, the water is passed through a filter with carbon fibers 8.

[0057] Chlorine is also added upstream of the carbon fiber filter 8 using an Impflanze 20. BWT Holding GmbH P1502PC00

[0058] The carbon fibers of filter 8 are designed as carbon nanotubes and remove organic chlorine compounds with high efficiency.

[0059] Then the pressure is increased via pump 10 and the water is passed through a desalination stage 9.

[0060] The overpressure generated by the first pump 4 is preferably below 1 bar.

[0061] The second pump 10 used to increase pressure ensures sufficient flow through the desalination stage 9.

[0062] The desalination stage 9 is preferably designed as an anion-cation mixed bed resin which is loaded with hydrogen.

[0063] After desalination stage 9, the water is disinfected by means of UV disinfection 11.

[0064] Within the UV disinfection unit 11, a UV sensor is provided, which can be used to measure the turbidity of the water.

[0065] The outgoing water can be collected in a collection container 12 and thus supplied to the basin as fresh water.

[0066] Via line 13, by opening and closing appropriate valves, the water can be returned to the collection tank 1 both after the layer filter 5 and after the carbon fiber filter 8.

[0067] Preferably, the system is designed such that the water is returned to collection tank 1 when a turbidity threshold is exceeded. This ensures that the collection tank 12 contains the BWT Holding GmbH P1502PC00

[0068] Only water that can be used as fresh water is collected as input water.

[0069] In the collection container 12, the water can be visually checked for suspended solids and / or discoloration.

[0070] Excessive turbidity can usually be remedied by backwashing layer filter 9.

[0071] The system includes a backwashing device for the layer filter 5.

[0072] The layer filter 5 includes a pneumatically controlled switching valve 14, by means of which the flow direction in the layer filter 5 can be reversed.

[0073] The pneumatic switching valve 14 is supplied with pressure via the compressor 15.

[0074] During backwashing operation for the layer filter 5, the treated water from the collection tank 12 is conveyed to the layer filter 5 via the line 17 by means of the pump 18.

[0075] The valves are configured so that, during backwashing, the backwash water from layer filter 5 can be discharged via line 19 or fed into the sewer system. During backwashing, layer filter 5 is preferably flushed from top to bottom.

[0076] The backwashing of the layer filter 5 can be automated when a turbidity threshold is exceeded and / or carried out manually using a button 16.

[0077] The system according to the invention achieves high water and energy savings. At the same time, the BWT Holding GmbH P1502PC00 system requires little maintenance. Only the regular replacement of the

[0078] An ion exchanger for desalination stage 9 is required. Desalination stage 9 can, for example, include a replaceable filter cartridge. The ion exchange material in the filter cartridge can be cleaned and regenerated.

[0079] BWT Holding GmbH P1502PC00

[0080] Reference symbol list

[0081] 1 collection container for backwash water

[0082] 2. Extraction

[0083] 3 coarse filters

[0084] 4 pump

[0085] 5-layer filter

[0086] 6 Dosing pump

[0087] 7 Chlorine solution

[0088] 8 filters with carbon fibers

[0089] 9th desalination stage

[0090] 10 pump

[0091] 11 UV disinfection with turbidity sensor

[0092] 12 collection containers for outgoing water

[0093] 13 Management

[0094] 14 Diverter valve

[0095] 15 Compressor

[0096] 16 buttons for backwashing

[0097] 17 Backwash line

[0098] 18 Backwash pump

[0099] 19 Line to the canal

[0100] 20 Impflanzen

Claims

BWT Holding GmbH P1502PC00 Claims:

1. Method for treating backwash water of a swimming pool filter, wherein the backwash water is directed into a collection tank and from the collection tank is first passed through a carbon fiber filter for the decomposition of organic chlorine compounds and then through a desalination stage comprising an ion exchanger.

2. Method according to the preceding claim, characterized in that the backwash water is passed over a layer filter with activated filter glass and / or activated carbon before being passed over the filter with carbon fibers.

3. A method according to one of the preceding claims, characterized in that the backwash water is directed onto a The residual salt content is reduced to less than 0.5 mg / l, preferably less than 0.2 mg / l, and in particular between 0.05 and 0.15 mg / l.

4. Method according to one of the preceding claims, characterized in that an oxidizing agent is added before the carbon fiber-containing filter and / or before the layer filter.

5. Method according to the preceding claim, characterized in that chlorine is added as an oxidizing agent.

6. Method according to the preceding claim, characterized in that chlorine is added before the carbon fibers BWT Holding GmbH P1502PC00 containing filter is added.

7. Method according to one of the preceding claims, characterized in that the treated backwash water is fed to the swimming pool, in particular via equalization basins of the water treatment system.

8. Method according to one of the preceding claims, characterized in that the turbidity of the water is measured after the carbon fiber-comprising filter.

9. Method according to the preceding claim, characterized in that when the turbidity threshold of the layer is exceeded, the filter is backwashed.

10. Plant for the treatment of backwash water of a filter of a swimming pool, comprising a collection tank for the backwash water with a suction device, a filter comprising carbon fibers, wherein a desalination stage comprising an ion exchanger is arranged downstream of the filter comprising carbon fibers.

11. Plant according to the preceding claim, characterized in that a layer filter with activated filter glass and / or activated carbon is arranged in front of the carbon fiber-comprising filter.

12. System according to the preceding claim, characterized in that the system comprises a backwashing device for the layer filter.

13. System according to one of the preceding claims, characterized in that a UV irradiation stage is arranged behind the carbon fiber-comprising filter. BWT Holding GmbH P1502PC00 is .

14. System according to one of the preceding claims, characterized in that the system comprises a sensor for measuring turbidity, which is in particular designed as a UV sensor in the UV irradiation stage.

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