SE2250249A1

SE2250249A1 - A filter system for purification of a fluid comprising an acoustic wave creating arrangement

Info

Publication number: SE2250249A1
Application number: SE2250249A
Authority: SE
Inventors: Håkan Löfholm; Oscar Lyttbacka
Original assignee: Zeo Concept Ece Ab
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2023-08-25
Also published as: WO2023163642A1; SE545635C2

Abstract

A filter system (100) for purification of a fluid using a filter (110) comprising aluminum silicate grains (112). The filter system (100) comprises an inlet arrangement (130) arranged to input the fluid to be purified into a container (120) comprising the filter (110). The fluid passes through the filter (110) and is ion exchanged and filtered by the aluminum silicate grains (112) in the filter (110). The filter system (100) further comprises a filtering influencing arrangement (140) configured to control the input of the fluid such that irregular currents are created in the fluid passing through the filter (110). The irregular currents cause individual vibrations of at least a portion of the aluminum silicate grains (112). Thereby, the growth of bio film on the aluminum silicate grains can be prevented or reduced and the effectiveness of the filter media can be prolonged.

Description

A FILTER SYSTEM FOR PURIFICATION OF A FLUID Field of invention The present invention relates to a filter system for purification of a fluid using aluminum silicate grains as defined in the preamble of claim 1. The present invention also relates to a corresponding method and computer program for carrying out the method.

Background of invention The following background information is a description of the background of the present invention, which does not necessarily have to be a description of prior art.

Various types of filter systems have been developed to purify fluids such as e.g. waste water from industrial plants or contaminated water in lakes. Filtering systems with a filter media such as an aluminum silicate are known and can be used to remove both contaminations and organic material from the fluid. The ion exchange properties of aluminum silicate allow a wide variety of impurities and pollutants in the fluid to be absorbed by the aluminum silicate and hence provide an effective purification.

However, conventional filter systems using aluminum silicate are often complex and uneconomical.

SUMARY OF INVENTION One problem with conventional filter systems based on aluminum silicate is that their effectiveness typically deteriorates over time due to e.g. organic substances in the fluid creating a bio film growth which clogs the pores in the filter media. Consequently, there is a need to provide an improved filter system which can reduce bio film growth such that the effectiveness of the filter can be maintained for longer periods of time.

An objective of the present invention is to provide a filter system for purification of a fluid that solve at least some of the above stated problems and/or disadvantages.

The above and further objectives are achieved by the subject matter of the independent claims. Further advantageous implementation forms of the present invention are defined by the dependent claims and other embodiments.

According to an aspect of the invention, the above mentioned and other objectives are achieved with a filter system for purification of a fluid according to the characterizing portion of claim 1. The filter system comprising: - a filter arranged in a container, the filter comprising aluminum silicate grains; and - an inlet arrangement arranged to input the fluid into the container such that the fluid passes through the filter, whereby the fluid is ion exchanged and filtered by the aluminum silicate grains; characterized by: - a filtering influencing arrangement configured to control the input of the fluid such that irregular currents are created in the fluid passing through the filter, whereby individual vibrations of at least a portion of the aluminum silicate grains are caused by the irregular currents.

An advantage with the filter system according to this aspect of the invention is that the created irregular currents lead to individual vibrations which cause movements between the aluminum silicate grains in the filter. When the aluminum silicate grains move relative to each other, they are rubbed and polished against each other. Thereby, the growth of bio film on the aluminum silicate grains can be prevented or reduced and the effectiveness of the filter media can be prolonged.

A further advantage with this aspect of the invention is that movements between the aluminum silicate grains are created by the fluid flowing though the filter. The number of moving parts in the filter system can thereby be reduced and the reliability of the filter system increased.

Furthermore, the filter system provides a controlled and adjustable flow of fluid and contact time with the filter. A predictable and easily controlled filtering effect can thereby be provided.

According to an embodiment of the present invention, the filtering influencing arrangement is configured to control the input of fluid such that it is pulsed, by providing variations of one or more of a pressure and a flow of the fluid being input, thereby creating the irregular currents.

An advantage with this embodiment of the invention is that the pulsed input of fluid is a very simple way of creating the irregular currents and thus individual vibrations of the grains, which adds very little to the complexity of the system. Furthermore, by controlling variations of the pressure and/or flow of the input of fluid, the filtering influencing arrangement can provide optimized pulses for a specific filtering use case, i.e. the pulses may be adapted based on characteristics of the fluid to be purified and/or the aluminum silicate grains.

Thereby, the filtering system can provide a flexible filtering and is able to handle a large variety of pollutions.

According to an embodiment of the present invention, the filtering influencing arrangement comprises at least one compressor arranged for varying a pressure of the fluid being input to create the pulsed input of fluid.

An advantage with this embodiment of the invention is that a compressor easily and at low cost provides the pulsed fluid input.

According to an embodiment of the present invention, the filtering influencing arrangement comprises a pump arranged for varying a flow of the fluid being input to create the pulsed input of fluid.

An advantage with this embodiment of the invention is that that a pump easily and at low cost, and with little complexity addition, provides the pulsed fluid input.

According to an embodiment of the present invention, the filtering influencing arrangement comprises at least one valve arranged for varying a flow of the fluid being input to create the pulsed input of fluid.

An advantage with this embodiment of the invention is that the pulsed fluid input is provided with a simple and low cost solution.

According to an embodiment of the present invention, the system further comprises a fluid tank coupled to the inlet arrangement, whereby the fluid tank is arranged to store fluid and to provide the fluid to the inlet arrangement.

An advantage with this embodiment of the invention is that the use of the fluid tank secures supply of fluid for the compressor and/or pump, such that they do not run out of fluid. Thereby, a continuous flow of fluid may be ensured. According to an embodiment of the present invention, the pulsed input of fluid comprises one or more pulses defined by one or more in the group of: - a magnitude of the pressure of the fluid; - a magnitude of the flow of the fluid; - a length in time of the one or more pulses; and - a frequency of an occurrence of the one or more pulses.

An advantage with this embodiment of the invention is that a large number of pulse variations may be achieved by altering one or more of these pulse parameters, whereby the individual vibrations may be tailored for the specific fluid conditions. According to an embodiment of the present invention, the filtering influencing arrangement is configured to control an aeriation of the fluid being input into the container, the aeriation creating the irregular currents.

An advantage with this embodiment of the invention is that the addition of air or oxygen further mitigates and/or prevents the growth of bio film on the aluminum silicate grains. The addition of air or oxygen further reduces the biological oxygen demand 7 days (BOD7) value, i.e. the amount of oxygen needed for microorganisms to degrade organic material in water within seven days.

According to an embodiment of the present invention, the aeriation is provided by inputting into the fluid one or more in the group of: - oxygen; - compressed oxygen; - air; and -compressed air.

An advantage with this embodiment of the invention is that the aeriation can be adapted to be optimized for the specific organic substances being present in the fluid.

According to an embodiment of the present invention, the filtering influencing arrangement is configured to transfer acoustic waves into the fluid and the aluminum silicate grains within the filter, such that the individual vibrations are caused.

An advantage with this embodiment of the invention is that the growth of bio film on the aluminum silicate grains is further mitigated and/or prevented, especially the growth of nitrate nitrogen from ammonium.

According to an embodiment of the present invention, the filtering influencing arrangement is configured to control one or more of the input of the fluid and a transfer of acoustic waves into the fluid based on one or more parameters in the group of: - a rainfall; - a type of pollution in the fluid; - a concentration of pollution in the fluid; - a conductivity of the fluid; - a granular size of the aluminum silicate; - a viscosity of the fluid; and - a turbidity of the fluid.

An advantage with this embodiment of the invention is that the creation of individual vibrations may be the optimized for the specific organic substances being present in the fluid. Furthermore, the filtering result and life time of the filter media can be calculated in advance.

According to an embodiment of the present invention, the individual vibrations comprise movements of individual grains relative to their neighboring grains, such that the grains are polished against each other.

An advantage with this embodiment of the invention is that the polishing of the grains prevents or reduces the growth of bio film on the grains.

According to an embodiment of the present invention, the inlet arrangement is arranged to input the fluid adjacent to a bottom of the container such that the fluid passes through the filter from a bottom towards a top of the filter.

An advantage with this embodiment of the invention is that the filtering of the fluid is easily controlled.

According to an embodiment of the present invention, the fluid is in contact with the aluminum silicate grains during a contact time when it passes through the filter from the bottom towards the top.

An advantage with this embodiment of the invention is that the contact time is well defined, and is also easily controllable, such that the filtering process becomes predictable and also controllable.

According to an embodiment of the present invention, the inlet arrangement comprises one or more nozzles, of which at least one nozzle is arranged adjacent to a bottom of the container when in use.

An advantage with this embodiment of the invention is that the above mentioned fluid flow from the bottom towards the top of the container is accomplished. According to an embodiment of the present invention, the aluminum silicate grains comprise one or more in the group of: and - natural zeolite grains; - artificial zeolite grains.

An advantage with this embodiment of the invention is that essentially any zeolite grains may be used as filter media in the filter.

According to another aspect of the invention, the above mentioned and other objectives are achieved with a method for purification of a fluid using a filter system; the filter system comprising: - a filter arranged in a container, the filter comprising aluminum silicate grains; - an inlet arrangement; and - a filtering influencing arrangement; the method comprising: - inputting the fluid into the container by usage of the inlet arrangement such that the fluid passes through the filter, whereby the fluid is ion exchanged and filtered by the aluminum silicate grains; and - controlling the input of the fluid, by usage of the filtering influencing arrangement, such that irregular currents are created in the fluid passing through the filter, whereby individual vibrations of at least a portion of the aluminum silicate grains are caused by the irregular currents.

The method may be adapted in accordance with the above- mentioned embodiments of the filter system. The advantages of the method are the same as the advantages of the corresponding embodiments of the filter system.

According to an aspect of the invention, the above mentioned and other objectives are achieved with a control unit arranged to control the filter system to carry out the method according to any embodiment of the method aspect.

According to further aspects of the present invention, the herein described methods are implemented by use of computer when the program products comprising instructions which, programs are executed by a computer, such as e.g. a herein mentioned control unit, cause the computer to carry out the steps of the methods according to any one of the herein described embodiments.

According to further aspects of the present invention, the herein described methods are implemented by use of computer- such readable storage media that, when executed by a computer, as e.g. a herein mentioned control unit, causes the computer to carry out the steps of the methods according to any one of the herein described embodiments.

Further applications and advantages of the present invention will be apparent from the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS Embodiments of the invention are described in more detail with reference to attached drawings illustrating examples of embodiments of the invention in which: Figure 1 shows a filter system according to an embodiment of the invention; Figure 2 shows an inlet arrangement according to an embodiment of the invention; Figure 3 shows a filtering influencing arrangement according to an embodiment of the invention; Figure 4 shows possible locations of filtering influencing arrangements according to various embodiments of the invention; Figure 5 shows a filtering influencing arrangement for transfer of acoustic waves according to an embodiment of the invention; and Figure 6 shows a method for a filter system according to an embodiment of the invention.

DETAILED DESCRIPTION OF INVENTION According to embodiments of the invention a filter system 100 for purification of a fluid is provided. Fig. 1 schematically shows the filter system 100 according to an embodiment of the invention. The filter system 100 comprises a filter 110 arranged in a container 120. The filter 110 comprises aluminum silicate grains 112, i.e. the filter media of the filter 110 comprises grains of one or more types of aluminum silicates. The aluminum silicate grains 112 may be natural and/or artificial zeolite grains. When natural zeolite grains are 11 used, the natural zeolite may e.g. be clinoptilolite, which can effectively purify a wide range of polluted fluids. The size of the aluminum silicate grains 112 may be adapted to the filtering use case, as will be further described below. The filter system 100 further comprises an inlet arrangement 130 arranged to input the fluid to be purified into the container 120 such that the fluid passes through the filter 110 and is ion exchanged and filtered by the aluminum silicate the fluid flows grains 112 in the filter 110. In other words, through and around the aluminum silicate grains 112, which absorbs impurities and pollutants in the fluid. Once purified, the fluid is output through an outlet arrangement 150. The flow of the fluid through the filter system 100 shown in Fig. 1 is indicated with dashed arrows. In the embodiment shown in Fig. 1, the inlet arrangement 130 is arranged to input the fluid adjacent or close to a bottom 122 of the container 120 such that the fluid passes through the filter 100 from a bottom 114 towards a top 116 of the filter 110, i.e. the fluid raises up through the filter 110. When the fluid reaches the level of the outlet arrangement 150, which is arranged above the filter 110 e.g. adjacent to a top 124 of the container 120, the purified fluid is output. With reference to Fig. 1, the level of the fluid Lﬂum_in the container 120 may hence be above the filter 110. The inlet arrangement 130 may be arranged to input the fluid adjacent to the bottom 122 of the container 120 with one or more nozzles 132 arranged adjacent to the bottom 122 of the container 120 when in use. The passing of the fluid through the filter 110 from the bottom 114 towards the top 116 provides for a well defined and also controllable contact time between the fluid and the aluminum silicate grains 112 in the filter 110. 12 Fig. 2 schematically shows an inlet arrangement 130 according to an embodiment of the invention. The inlet arrangement 130 comprises an inlet 134 for receiving the fluid to be purified and one or more nozzles 132, four nozzles 132 as e.g. illustrated in Fig. 2, for outputting the fluid into the filter 110. When in use in the container 120, the inlet 134 is at least partly arranged adjacent to the top 124 of the container 120, while the nozzles 132 are arranged adjacent to the bottom 122 of the container 120. The inlet 134 may hence be arranged higher than/above the nozzles 132, such that the fluid received by the inlet 134 falls down through the inlet arrangement 130 towards the nozzles 132 due to gravity. The nozzles 132 may be distributed over a bottom area of the container 120, in a respective quarter of the bottom area e.g. of the container 120 when four nozzles 132 are used. In this way, the fluid to be purified can be essentially evenly distributed over the bottom 114 of the filter 110, and may be in contact with the aluminum silicate grains 112 during a contact time when it raises up through the filter 110. Also, by using gravity, essentially no additional components need to be added to the system for distributing the fluid over the bottom 114 of the filter.

Although the shown inlet arrangement 130 comprises four nozzles 132, the inlet arrangement 130 may comprise essentially any number of nozzles 132, and the nozzles 132 may also be arranged differently than shown in the figures, without deviating from the scope of the invention. For example, one or more nozzles 132 may be arranged adjacent to the bottom 122 of the container 120 and/or one or more nozzles 132 may be arranged at a side or top of the container 120. 13 Also, the nozzles 132 may be distributed differently over the bottom area of the container 120 than shown in the figures.

The filter system 100 further comprises a filtering influencing arrangement 140 configured to control the input of the fluid such that irregular currents are created in the fluid passing through the filter 110. The filtering influencing arrangement 140 may be connected/coupled to or arranged in the inlet arrangement 130. The filtering influencing arrangement 140 may e.g. be connected to an inlet 134 of the inlet arrangement 130 and provide the fluid to be purified to the inlet arrangement 130, as indicated in Fig. 1. The irregular currents in the fluid created by the filtering influencing arrangement 140 causes individual vibrations of at least a portion of the aluminum silicate grains 112. The individual vibrations may comprise movements of individual grains relative to their neighboring grains, such that the grains are polished against each other. Thus, a grain vibrating individually moves slightly different than its neighboring grains. The grains vibrating due to the irregular currents are hence rubbed against each other, and any growth on the surface of the grains such as e.g. a bio film may thereby be removed or reduced. Also, the individual vibrations may prevent that such a growth begins at all. The individual vibrations of the grains, i.e. the relative movements between them, i.e. in relation to neighboring grains, may be small, e.g. microscopic and/or small relative to a diameter of the grains.

In some embodiments, the filtering influencing arrangement 140 is configured to control the input of fluid such that it is i.e. pulsed, such that fluid is input into the container 120 14 and the filter 110 in one or more pulses. The pulsed input of fluid creates the irregular currents in the fluid passing through the filter 110 and hence causes the individual vibrations of at least a portion of the aluminum silicate grains 112 in the filter 110. The filtering influencing arrangement 140 may control the input of fluid to be pulsed by providing variations of one or more of a pressure and a flow of the fluid being input. The filtering influencing arrangement 140 may e.g. increase or decrease the pressure and/or flow of the fluid being input, either in one step to create one pulse, or periodically and/or aperiodically to create a series of pulses.

The variations of the pressure and/or flow of the fluid being input may be provided in a number of different ways. With reference to Fig. 3, the filtering influencing arrangement 140 may e.g. comprise one or more compressors 142, one or more pumps 144, and/or one or more valves 146, by use of which the filtering influencing arrangement 140 may control the input of fluid to be pulsed. Each of the one or more compressors 142, the one or more pumps 144, and/or the one or more valves 146 may be connected/coupled to the inlet 134 of the inlet arrangement 130 or may at least partly be arranged inside the inlet arrangement 130.

Fig. 4 schematically shows non-limiting examples of possible locations of the filtering influencing arrangement 140 in adjacent relation to the inlet arrangement 130, such as e.g. to the inlet 134, at the top of the inlet arrangement 130 or adjacent to the nozzles 132. The one or more compressors 142, the one or more pumps 144, and/or the one or more valves 146 may be arranged and/or controlled separately or in combination and/or coordination to create the pulsed input of fluid. As shown in Fig. 4, the filtering influencing arrangement 140 may at least partly be arranged in various parts of the inlet arrangement 130. The filtering influencing arrangement 140 may, according to some embodiments, also be arranged in or at the container 120. Actually, the filtering influencing arrangement 140 may, according to the herein presented various embodiments, be arranged essentially anywhere within the filter system 100 where it is able to cause the irregular currents in the fluid and/or filter 110.

The at least one compressor 142 may be arranged for varying the pressure of the fluid being input to create the pulsed input of fluid, while the at least one pump 144 and/or the at least one valve 146 may be arranged for varying the flow of the fluid being input to create the pulsed input of fluid. By controlling the one or more compressors 142, the one or more pumps 144, and/or the one or more valves 146, the filtering influencing arrangement 140 may hence vary the pressure and/or flow of the fluid being input such that it is input in one or more pulses, thereby creating the irregular currents and thus also the individual vibrations of the grains.

The one or more pulses comprised in the pulsed input of fluid controlled by the filtering influencing arrangement 140 may be defined by one or more in the group of: - a magnitude of the pressure of the fluid; a magnitude of the flow of the fluid; a length in time of the one or more pulses; and a frequency of an occurrence of the one or more pulses.

The filtering influencing arrangement 140 may control the variations of the pressure and/or flow of the input of fluid to provide optimized pulses for a specific filtering use case. 16 In other words, the above-mentioned properties of the pulses may be adapted based on characteristics of the fluid to be purified and/or the aluminum silicate grains 112, such that an optimized purification is provided.

The filtering influencing arrangement 140 may further be arranged to utilize gravity for creating a flow of the input of the fluid. The flow of the input fluid due to gravity may be provided by, in use, arranging the inlet 134 of the inlet arrangement 130 vertically higher than the one or more nozzles 132 of the inlet arrangement 130, i.e. by a difference in height between the inlet 134 and the one or more nozzles 132 (as shown in e.g. Fig. 2). The filtering influencing arrangement 140 may utilize gravity in combination with any of the herein described methods for creating and/or increasing variations and/or pulses in the input fluid.

The filter system 100 may further comprise a fluid tank coupled to the inlet arrangement 130. The fluid tank may be arranged to store fluid and to provide the fluid to the inlet a continuous flow of fluid to arrangement 130. In this way, the inlet arrangement 130 may be ensured. In embodiments, the filtering influencing arrangement 140 is configured to control an aeriation of the fluid being input into the container, whereby the aeriation creates, or contributes to the creation of, the irregular currents. The aeriation may thus be the single source for creating the irregular currents or may be used together with the above- mentioned pulsed input of fluid.

The aeriation may be provided by inputting into the fluid a gas such as one or more in the group of oxygen, compressed 17 oxygen, air and compressed air. Thus, the filtering influencing arrangement 140 may control the input of the gas into the input of fluid such that the fluid is aeriated. The aeration creates bubbles in the fluid which in turn creates or increases the irregular currents and individual vibrations. The aeration further reduces the BOD7 value as the fluid is oxygenated.

The filtering influencing arrangement 140 may further be configured to transfer acoustic waves into the fluid and the aluminum silicate grains 112 within the filter 110, such that the individual vibrations are caused and/or further increased. The acoustic waves may e.g. be low subsonic frequencies, and may in some embodiments be caused by intentionally created and controlled vibrations. The acoustic waves transferred into the filter 110 cause waves/pulses in the fluid in the filter 110, which in turn cause the aluminum silicate grains 112 within the filter 110 to move relative to each other. The filtering influencing arrangement 140 may utilize acoustic waves in combination with any of the herein described methods for creating and/or increasing variations and/or pulses in the input fluid.

In some embodiments the acoustic waves may be provided by creating physical and/or mechanical vibrations in the inlet arrangement 130 with a filtering influencing arrangement 140 in the form of a swirling arrangement 149, i.e. an arrangement creating swirls in a fluid passing/flowing through the vibrations are created/produced in the arrangement. Hereby, inlet arrangement 130, and are then transformed into acoustic waves propagating through the fluid in the filter 110. Fig. 5 shows a part of an inlet arrangement 130 according to such an embodiment. The swirling arrangement 149 is arranged in the 18 inlet arrangement 130, adjacent to the nozzle 132. The e.g. fluid falls down the inlet arrangement 130 due to gravity (as mentioned above) and when passing the swirling arrangement 149 acoustic waves are created which are transferred into the fluid and the aluminium silicate grains 112 within the filter 110. When combining the swirling arrangement 149 with the pulsed input of fluid, acoustic waves with greater amplitude can be provided, thereby increasing the individual grain vibrations in the filter 110.

Thus, as mentioned above in connection with Fig. 4, the filtering influencing arrangement 140 may be arranged at least partly in the inlet arrangement 130. When acoustic waves are to be transferred into the fluid and the aluminum silicate grains 112, the inlet arrangement 130 may comprise an acoustic wave creating arrangement, as a part of the filtering influencing arrangement 140, which creates acoustic waves and transfers them into the filter 110. One such acoustic wave creating arrangement may be the swirling arrangement 149, which by its mechanical design creates vibrations in form of acoustic waves when the fluid passes through it. If the fluid is pulsed, the magnitude of the acoustic waves may be controlled, such that they are increased. e.g.

The acoustic waves may, according to an embodiment, further be provided using a filtering influencing arrangement 140 comprising a speaker or other low frequent sound generating device arranged adjacent to or in contact with the inlet and/or filter 110. Such a arrangement 130, container 120, device for creating sound/acoustic waves, and thus a part of the filtering influencing arrangement 140, may according to various embodiments be located for example within the 19 container 120 or adjacent to, and in contact with, the container 120.

For all of the herein described means used to create the individual vibrations of the aluminum silicate grains 112, the characteristics of the individual vibrations may be controlled by the filtering influencing arrangement 140 based on the filtering use case, e.g. based on properties of the aluminum silicate grains 112 and/or the fluid to be purified. In various embodiments, the filtering influencing arrangement 140 may be configured to control one or more of the input of the fluid and the transfer of acoustic waves into the fluid based on one or more parameters in the group of: - a rainfall; - a type of pollution in the fluid; - a concentration of pollution in the fluid, a weight e.g. and/or volume of pollution in the fluid; - a conductivity of the fluid; - a granular size of the aluminum silicate; - a viscosity of the fluid; and - a turbidity of the fluid, i.e. a cloudiness or a haziness of the fluid caused by large numbers of individual particles. By considering these parameters, the filtering influencing arrangement 140 may control the input of the fluid and/or the transfer of acoustic waves to provide individual vibrations with desired characteristics. The filtering influencing arrangement 140 may further adapt the input of the fluid and/or the transfer of acoustic waves over time to compensate for changes in one or more of the parameters during the filtering of the fluid. The filtering influencing arrangement 140 may e.g. continuously, periodically, or at irregular intervals check the current values of one or more parameters and update the control of the input of the fluid and/or the transfer of acoustic waves based on the current values.

To cause and/or further increase movements and/or individual vibrations among the aluminum silicate grains 112 in the filter 110, the container 120 itself may be configured to move or vibrate. The container 120 may e.g. be arranged on a vibrating plate which causes vibrations of the container 120, which reproduces/are transferred into the filter 110 inside the container 120. The container 120 may further be arranged to be suspended such that it can easily be moved vertically and/or horizontally to create movements and/or vibrations of the container 120, and hence of the filter 110 inside the container 120.

According to embodiments of the invention a method 200 for purification of a fluid using a filter system 100 is provided. As described with reference to Fig. 1, the filter system 100 comprises a filter 110 comprising aluminum silicate grains 112 arranged in a container 120, an inlet arrangement 130 and a filtering influencing arrangement 140.

A flow chart of the method 200 is shown in Fig. 6 and includes the steps of: - inputting 202 the fluid into the container 120 by usage of the inlet arrangement 130 such that the fluid passes through the filter 110, whereby the fluid is ion exchanged and filtered by the aluminum silicate grains 112; and - controlling 204 the input of the fluid, by usage of the filtering influencing arrangement 140, such that irregular currents are created in the fluid passing through the filter 110, whereby individual vibrations of at least a portion of 21 the aluminum silicate grains 112 are caused by the irregular currents.

According to embodiments of the invention, the filter system 100 may comprise or be connected to a control unit arranged to control the filter system 100 to carry out the method 200. The control unit may hence be arranged/configured/programmed with instruction to control the filter system 100 to perform the steps of any of the herein described embodiments.

The herein described filter system 100, method 200 and control unit are not limited by the above-mentioned embodiments. The filter system 100, method 200 and control unit are instead limited by the independent claims.

Claims

1. A filter system (100) for purification of a fluid; comprising: - a filter the filter (110) (110) (120), (112); arranged in a container comprising aluminum silicate grains and - an inlet arrangement (130) (120) arranged to input said fluid into said container (110), such that said fluid passes through said filter whereby said fluid is ion exchanged and filtered (ll2); (140) by said aluminum silicate grains characterized by: - a filtering influencing arrangement configured to control said input of said fluid such that irregular currents are created in said fluid passing through said filter (110), whereby individual vibrations of at least a portion of said aluminum silicate grains (112) are caused by said irregular currents.

2. Filter system (100) according to claim 1, wherein said filtering influencing arrangement (140) is configured to control said input of fluid such that it is pulsed, by providing variations of one or more of a pressure and a flow of said fluid being input, thereby creating said irregular currents.

3. Filter system (100) according to claim 2, wherein said filtering influencing arrangement (140) (142) comprises at least one compressor arranged for varying a pressure of said fluid being input to create said pulsed input of fluid.

4. Filter system (100) according to claim 2 or 3, wherein said filtering influencing arrangement (140) comprises a pump(144) arranged for varying a flow of said fluid being input to create said pulsed input of fluid.

5. Filter system (100) according to any one of claims 2-4, wherein said filtering influencing arrangement (140) comprises at least one valve (146) arranged for varying a flow of said fluid being input to create said pulsed input of fluid.

6. Filter system (100) according to any one of claims 1-5, wherein said filter system (100) further comprises a fluid tank coupled to said inlet arrangement (130), whereby said fluid tank is arranged to store fluid and to provide said fluid to said inlet arrangement (130).

7. Filter system (100) according to any one of claims 2-6, wherein said pulsed input of fluid comprises one or more pulses defined by one or more in the group of: - a magnitude of said pressure of said fluid; - a magnitude of said flow of said fluid; - a length in time of said one or more pulses; and - a frequency of an occurrence of said one or more pulses.

8. Filter system (100) according to any one of claims 1-7, wherein said filtering influencing arrangement (140) is configured to control an aeriation of said fluid being input into said container (120), said aeriation creating said irregular currents.

9. Filter system (100) according to claim 8, wherein said aeriation is provided by inputting into said fluid one or more in the group of: - oxygen; - compressed oxygen;- air; and - compressed air.

10. Filter system (100) according to any one of claims 1-9, wherein said filtering influencing arrangement (140) is configured to transfer acoustic waves into said fluid and said (112) within said filter (110), aluminum silicate grains such that said individual vibrations are caused.

11. Filter system (100) according to any one of claims 1-10, wherein said filtering influencing arrangement (140) is configured to control one or more of said input of said fluid and a transfer of acoustic waves into said fluid based on one or more parameters in the group of: - a rainfall; - a type of pollution in said fluid; - a concentration of pollution in said fluid; - a conductivity of said fluid; - a granular size of said aluminum silicate; - a viscosity of the fluid; and - a turbidity of said fluid.

12. Filter system (100) according to any one of claims 1-11, wherein said individual vibrations comprise movements of (112) individual grains relative to their neighboring grains (112), such that said grains are polished against each other.

13. Filter system (100) according to any one of claims 1-12, (130) is arranged to input said (120) wherein said inlet arrangement of said container such that said fluid passes through said filter (110) (114) (116) (110). fluid adjacent to a bottom (122) from a bottom towards a top of said filter wherein said (112) (110)

14. Filter system (100) according to claim 13, fluid is in contact with said aluminum silicate grains during a contact time when it passes through said filter (116). from said bottom (114) towards said top

15. Filter system (100) according to any one of claims 1-14, wherein said inlet arrangement (130) comprises one or more (132) (120) nozzles (132), of which at least one nozzle is arranged adjacent to a bottom (122) of said container when in use.

16. Filter system (100) according to any one of claims 1-15, wherein said aluminum silicate grains (112) comprise one or more in the group of: - natural zeolite grains; and - artificial zeolite grains.

17. Method (200) for purification of a fluid using a filter system (100); said filter system (100) comprising: - a filter (110) arranged in a container (120), said filter (110) comprising aluminum silicate grains (112); - an inlet arrangement (130); and - a filtering influencing arrangement (140); said method (200) comprising: said fluid into said container usage of said inlet arrangement (130) (110), (120) by such that said fluid - inputting (202) whereby said fluid is ion (112); passes through said filter exchanged and filtered by said aluminum silicate grains and - controlling (204) said input of said fluid, by usage of said filtering influencing arrangement (140), such that irregular currents are created in said fluid passing through said filter(110), whereby individual vibrations of at least a portion of said aluminum silicate grains (112) are caused by said irregular currents.

18. Computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method (200) according to claim

19. Computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method (200) according to claim

20. Control unit arranged to control a filter system (100) (200) (300) for purification of a fluid to carry out the method according to claim 17.