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

Abstract

The disclosure relates to a method for treating backwash water from a swimming pool filter. The backwash water is directed into a collection tank and from there, for the decomposition of organic chlorine compounds, first through a carbon fiber filter. The backwash water is then passed through a desalination stage comprising an ion exchanger.

Description

Field of invention

[0001] The invention relates to a method and a system for treating the backwash water of a swimming pool filter. Background of the invention

[0002] Operating municipal swimming pools, in particular, 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.

[0003] 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.

[0004] In addition to water consumption, this usually also causes high energy consumption, since the tap water used as fresh water is generally colder than the desired temperature of the swimming pool water. Object of the invention

[0005] 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. Summary of the invention

[0006] 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.

[0007] Preferred embodiments and further developments of the invention can be found in the subject matter of the dependent claims, the description and the drawings.

[0008] The invention relates to a method for treating backwash water from a swimming pool filter.

[0009] The backwash water is first directed into a collection tank. Preferably, the water is allowed to stand initially 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 particularly from 30 minutes to 24 hours, is provided.

[0010] According to the invention, the backwash water is passed through a filter comprising carbon fibers.

[0011] It has been shown that carbon fibers decompose organic compounds, especially organochlorine compounds, with high efficiency. Such a filter material is described, for example, in document WO 2022 / 152338 A1.

[0012] 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 at 0.3 to 0.8 bar.

[0013] The water to be treated is then passed through a desalination stage. This 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.

[0014] 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.

[0015] Compared to the use of membrane technologies, this allows for the efficient provision of desalinated source water, which can be used as fresh water.

[0016] In a further development of the invention, the backwash water is passed through a layer filter with activated filter glass and / or activated carbon before being directed through the filter with the carbon fibers.

[0017] The layer filter removes finer particles, especially the abrasion from the backwashed filter system of the swimming pool.

[0018] The activated glass can contain, in particular, sodium oxide, especially 5 to 20% by weight, and / or calcium oxide, especially 5 to 20% by weight. Due to its reactive properties, chloride and bound chlorine are removed. The activated glass can be in the form of a bulk material, preferably with a particle size of 0.4 to 1.2 mm.

[0019] Hydroanthracite granules are preferably used as activated carbon. In particular, hydroanthracite H is used.

[0020] The layered filter can, in particular, comprise at least one activated carbon layer and at least one layer on activated glass.

[0021] According to 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.

[0022] In one embodiment of the invention, an oxidizing agent is added upstream of the carbon fiber filter and / or the sheet 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 sheet filter and the carbon fiber filter.

[0023] In a further development of the invention, the water to be treated is disinfected with UV radiation after the desalination stage.

[0024] 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.

[0025] 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.

[0026] If the turbidity exceeds a threshold value, the water is preferably directed back into the collection tank via a return line.

[0027] In a further development of the invention, the layer filter is backwashed, in particular if the turbidity of the source water is above a threshold value.

[0028] The outgoing water collected in a collection container can be used, in particular, for backwashing the layer filter.

[0029] 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.

[0030] The invention further relates to a system for treating backwash water from a swimming pool filter.

[0031] 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.

[0032] Furthermore, as described above, the system can include a layered filter with activated filter glass and / or activated carbon upstream of the carbon fiber filter.

[0033] According to one embodiment, the system includes a backwashing device for the layer filter.

[0034] Furthermore, as provided in a preferred embodiment, the system can include a UV irradiation stage behind the carbon fiber filter.

[0035] Furthermore, the system can include a sensor for measuring turbidity. This is preferably designed as a UV sensor in the UV irradiation stage.

[0036] The system is preferably designed for a throughput of 10 to 10,000 l / h, in particular of 50 to 5,000 l / h. Description of the drawings

[0037] 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.

[0038] First, the backwash water to be treated is collected in a collection container 1. This can be, in particular, a basin.

[0039] The swimming pool and the filters used for the swimming pool are not shown in this illustration.

[0040] Preferably the water is initially left to stand and is then preferably extracted from the water surface via a suction device 2 for treatment.

[0041] 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.

[0042] The water is then passed through the layer filter 5 by means of pump 4. The layer filter 5 contains activated glass granules and activated carbon. This process removes at least some of the chloride and combined chlorine.

[0043] The layer filter 5 is preferably flowed through from bottom to top.

[0044] Chlorine is added as an oxidizing agent before the layer filter 5.

[0045] In this embodiment, chlorine is added via the dosing pump 6, which delivers a chlorine solution 7 to the water via an injector 20.

[0046] After the layer filter, the water is passed through a carbon fiber filter 8.

[0047] Chlorine is also added in front of the carbon fiber filter 8 using an Impflanze 20.

[0048] The carbon fibers of filter 8 are designed as carbon nanotubes and remove organic chlorine compounds with high efficiency.

[0049] The pressure is then increased via pump 10 and the water is passed through a desalination stage 9.

[0050] The overpressure generated by the first pump 4 is preferably below 1 bar.

[0051] The second pump 10, used to increase pressure, ensures sufficient flow through the desalination stage 9.

[0052] The desalination stage 9 is preferably designed as an anion-cation mixed bed resin, which is loaded with hydrogen.

[0053] After desalination stage 9, the water is disinfected by means of UV disinfection 11.

[0054] Within the UV disinfection unit 11, a UV sensor is provided, which can be used to measure the turbidity of the water.

[0055] The outgoing water can be collected in a collection container 12 and thus supplied to the basin as fresh water.

[0056] Via line 13, by opening and closing appropriate valves, the water can be returned to the collection container 1 both after the layer filter 5 and after the carbon fiber filter 8.

[0057] Preferably, the system is designed such that when a turbidity threshold is exceeded, the water is returned to the collection tank 1. This ensures that only water suitable for use as fresh water is collected in the collection tank 12 for the output water.

[0058] In the collection container 12, the water can be visually inspected for suspended solids and / or discoloration.

[0059] Excessive turbidity can usually be remedied by backwashing the layer filter 9.

[0060] The system includes a backwashing device for the layer filter 5.

[0061] 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.

[0062] The pneumatic switching valve 14 is supplied with pressure via the compressor 15.

[0063] 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.

[0064] The valves are configured so that, during backwashing, the backwash water from the layer filter 5 can be discharged via line 19 or fed into the sewer system. During backwashing, the layer filter 5 is preferably flushed from top to bottom.

[0065] The backwashing of the layer filter 5 can be automated when a threshold value for turbidity is exceeded and / or carried out manually by means of a button 16.

[0066] The system according to the invention achieves significant water and energy savings. At the same time, the system requires little maintenance. Only the regular replacement of the ion exchanger in desalination stage 9 is necessary. Desalination stage 9 can, for example, comprise a replaceable filter cartridge. The ion exchange material in the filter cartridge can be cleaned and regenerated. Reference symbol list 1 collection container for backwash water 2. Extraction 3 coarse filters 4 pump 5-layer filter 6 Dosing pump 7 Chlorine solution 8 filters with carbon fibers 9th desalination stage 10 pump 11 UV disinfection with turbidity sensor 12 collection containers for outgoing water 13 Management 14 Diverter valve 15 Compressor 16 buttons for backwashing 17 Backwash line 18 Backwash pump 19 Line to the canal 20 Impflanzen QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2022 / 152338 A1

[0011]

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 by that the backwash water is passed through a layer filter with activated filter glass and / or activated carbon before being directed over the carbon fiber filter. [3] Method according to any of the preceding claims, characterized by that the backwash water is desalinated to a residual salt content of less than 0.5 mg / l, preferably less than 0.2 mg / l, in particular between 0.05 and 0.15 mg / l. [4] Method according to any of the preceding claims, characterized by, that an oxidizing agent, in particular chlorine, is added before the carbon fiber-containing filter and / or before the layer filter. [5] Method according to any of the foregoing claims, characterized by that the treated backwash water is fed into the swimming pool, in particular via the water treatment system's equalization basins. [6] Method according to any of the foregoing claims, characterized by , that the turbidity of the water is measured after the carbon fiber filter. [7] Method according to the preceding claim, characterized by , that when the turbidity threshold is exceeded, the layer filter is backwashed. [8] System 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. [9] Plant according to the preceding claim, characterized by that a layered filter with activated filter glass and / or activated carbon is arranged in front of the carbon fiber-containing filter. [10] Plant according to the preceding claim, characterized by that the system includes a backwashing device for the layer filter. [11] Plant according to any of the preceding claims, characterized by that a UV irradiation stage is arranged behind the carbon fiber filter. [12] Plant according to any of the preceding claims, characterized bythat the system includes a sensor for measuring turbidity, which is specifically designed as a UV sensor in the UV irradiation stage.

Images