Filter unit for treating liquids

Abstract

The present invention relates to a filter unit for treating a liquid wherein the filter unit is connected to a food processing machine and comprises a filter and an ultraviolet radiation source for disinfecting the liquid. The invention further relates to a method for treating a liquid.

Description

Technical Field

[0001] The invention relates to a filter unit for treating a liquid, wherein the filter unit is connected to a food processing machine and comprises a filter and a source of ultraviolet radiation for sterilizing the liquid. Furthermore, the invention relates to a method for treating a liquid. Background Art

[0002] Such systems are known in the prior art, for example US 4,094,237A, which discloses an apparatus for purifying brine contaminated by bacteria overflowing from a bacon curing machine. The contaminated brine is collected in a collection tank, passed through a filter and mixed with fresh brine, which is directed to the rear of the filter to backwash the filter. This brine mixture passes through a series of ultraviolet liquid purification devices and then through a second filter. The system includes a tank for collecting the overflowing used brine, wherein additional fresh brine is added to the tank. The tank includes a skimmer for extracting fat particles from the surface of the brine, and a filter head is arranged in the tank. The mixture of contaminated brine and fresh brine is drawn through the filter head and pumped to the ultraviolet purification device through a pipe. The purification device is tubular and includes an inlet and an outlet, wherein ultraviolet radiation is included. The brine flows through the pipe and around the ultraviolet radiation source. Although the liquid is pre-filtered, particles with a diameter smaller than the filter opening and fat in the brine are still sucked into the ultraviolet purification device. Over time, the efficiency of the UV radiation source decreases due to the accumulation of a fouling film around the UV radiation source. This film includes fats and particles. The tubular structure makes cleaning of the purification device more difficult and leads to reduced efficiency. This is a particular disadvantage in the food industry, as the food industry has extremely high standards for clean machines and the use of non-contaminating liquids.

[0003] Other systems are known from EP 1 737 795 B1 and DE 10 2011 112 994 A1, which also disclose tubular devices for treating fluid media via UV radiation, which face the same difficulties as described above. The contaminated fluid either flows around the UV radiation source or flows through multiple radiation sources, forming areas that are difficult to clean. In addition to the complex disassembly process of these devices, this also makes cleaning more time-consuming and increases the frequency of cleaning.

[0004] It is therefore an object of the present invention to avoid the problems according to the prior art and / or to improve the known systems. Summary of the invention

[0005] This problem is solved by a filter unit for treating a liquid, wherein the filter unit comprises an inlet, an outlet, a filter and a sterilizing device, wherein the inlet and the outlet are respectively connected to a food processing machine, and the sterilizing device comprises an ultraviolet radiation source, which is configured to irradiate ultraviolet radiation onto a filter surface.

[0006] The present invention relates to a filter unit which is particularly designed for use in combination with a food processing machine, in particular in combination with a saline injection device. The food processing machine can process typical products, for example meat such as poultry, fish and / or vegetarian food, but is also suitable for other products. The liquid to be filtered usually contains solid particles, which are at least partially removed by the filter unit. Typical particles include bone fat and / or meat fiber particles. An inlet and an outlet of the filter unit allow the liquid to flow through the filter unit, wherein the inlet introduces unfiltered liquid into the filter unit and the outlet releases the filtered liquid. The filtration is accomplished by means of a filter, such as a perforated plate element or a mesh. The filter comprises a filter surface, and the liquid preferably passes through the filter. The filter separates the particles from the liquid. The filter surface usually has a length and a width. If the liquid overflows the filter surface during filtration, the length of the filter surface preferably extends parallel to the flow direction. The width of the filter can be considered to extend perpendicularly to the liquid flow direction in a horizontal plane.

[0007] According to the present invention, the filter unit further comprises a disinfection device. The disinfection device comprises an ultraviolet radiation source, which emits ultraviolet electromagnetic waves to the filter surface. The emitted radiation is directed to the filter surface. The ultraviolet radiation can be any ultraviolet radiation source, but in a particularly preferred embodiment, the ultraviolet radiation source emits UV-C radiation (100nm-280nm). UV-A radiation (315nm-400nm) and UV-B radiation (218nm-315nm) can also be selected. Since the energy of UV-C radiation is higher than that of UV-A and UV-B radiation, it is advantageous to use UV-C radiation. Ultraviolet radiation with a wavelength lower than 200nm can decompose oxygen molecules and allow the formation of ozone, which is very beneficial for disinfection purposes. Ultraviolet radiation sources with a wavelength of 1nm-100nm can also be used.

[0008] Preferably, the ultraviolet radiation is carried out using an artificial ultraviolet radiation source, wherein the artificial ultraviolet radiation source can be any form of mercury vapor lamp (e.g., low pressure, medium pressure, high pressure or ultra high pressure) or ultraviolet light emitting diode (LED), or any other form of ultraviolet radiation emitting light source. Mercury vapor lamps and ultraviolet LEDs are particularly effective in emitting ultraviolet radiation. It is particularly desirable to use ultraviolet LEDs because they are variable in intensity and wavelength, and in addition, ultraviolet LEDs emit less infrared radiation than mercury vapor lamps. Therefore, ultraviolet LEDs will not cause unnecessary heating of the liquid. The use of ultraviolet LEDs will also enable easier checking of light intensity, longer service life and better reliability.

[0009] Preferably, the radiation intensity of the UV radiation source and the distance between the UV radiation source and the filter surface can be varied, for example, depending on the degree of contamination of the liquid and / or the liquid flow rate. Preferably, the frequency and / or amplitude of the radiation can also be varied.

[0010] The liquid entering the filter unit preferably flows through and / or passes over the filter surface and spreads along the length and width of the filter surface, thereby creating a larger surface area to increase the efficiency of disinfecting the liquid. The liquid is preferably exposed to ultraviolet radiation when it is not filtered and / or only partially filtered. Therefore, both the liquid and the liquid are disinfected.

[0011] The system may further include a residue tank for collecting filtered particles.

[0012] Preferably, the disinfection device comprises a plurality of ultraviolet radiation sources. A plurality of ultraviolet radiation sources may emit ultraviolet radiation of different intensities and / or wavelengths, or may emit ultraviolet radiation of the same intensity and / or wavelength. A plurality of ultraviolet radiation sources may be arranged in parallel, for example, parallel or perpendicular to the direction of liquid flow and / or the length of the filter surface. Each source may be individually controlled according to amplitude and / or wavelength.

[0013] According to a preferred embodiment of the invention, a plurality of ultraviolet radiation sources are distributed along the length of the filter. The length of the filter is oriented in a horizontal plane and defines the extension of the filter in this plane. The length of the filter starts from the position where the liquid flows onto the filter. Preferably, each ultraviolet radiation source has a longitudinal extension, and more preferably, this longitudinal extension is parallel or perpendicular to the flow of the liquid along the filter surface and / or the longitudinal extension of the filter surface. The longitudinal extension of the ultraviolet radiation source is preferably parallel to the filter surface.

[0014] The distance of each UV radiation source to the filter surface of the filter can be varied between at least two UV radiation sources. In areas with a higher degree of pollution, the UV radiation sources are preferably arranged closer to the filter surface, wherein in areas with a lower degree of pollution, the UV radiation sources are preferably arranged at a higher position above the filter surface.

[0015] Alternatively or additionally, a plurality of UV radiation sources may be arranged in parallel and parallel to the extension of the width of the filter surface, wherein the radiation sources may be arranged equidistantly or unequally spaced over the filter area. In a further preferred embodiment, the filter unit comprises a plurality of UV radiation sources, wherein the radiation sources are arranged linearly along the length of the filter, wherein the UV radiation sources are preferably arranged parallel to each other.

[0016] Preferably, each UV radiation source is mounted on a movable device, wherein the device can be manually adjusted in height. If there are a plurality of radiation sources extending in a row along the width of the filter, the height of all radiation sources in the row can be adjusted simultaneously, or the height of each radiation source can be adjusted individually. Particularly preferably, the movable device is driven by an electric motor, wherein the electric motor is controlled based on the sensor data. Advantageously, this preferred embodiment can improve the overall efficiency of disinfecting the liquid. Examples of sensors to be used can be flow sensors at the inlet of the filter unit, or detecting the liquid quality by a suitable sensor to measure the contamination level of the liquid, or arranging a temperature sensor close to the outlet position in the existing liquid flow.

[0017] According to a preferred embodiment of the present invention, a plurality of ultraviolet radiation sources are configured to emit ultraviolet radiation of different and / or same intensities and / or different and / or same wavelengths. Variations in intensity and wavelength between ultraviolet radiation sources can improve efficiency while also reducing energy consumption. Furthermore, no unwanted energy is introduced into the liquid, wherein a rise in temperature of the liquid may be undesirable.

[0018] As the filter length increases, the time the liquid is exposed to UV radiation also increases. In areas with lower pollution levels, it is preferable to reduce the intensity of UV radiation to achieve energy savings.

[0019] The intensity of the UV radiation source can also be varied based on the sensor data. If the contamination level or flow rate of the liquid increases, a higher intensity UV radiation is preferred. Vice versa. Additionally, when the UV radiation source is arranged close to the filter surface, the intensity of the radiation source can be reduced. The intensity variation can depend on the height of each radiation source, the contamination level of the liquid, and the flow rate.

[0020] Alternatively or additionally, the intensity of the ultraviolet radiation sources extending in rows along the width of the filter can also be varied. If there are multiple rows extending along the width of the filter (horizontally) and arranged in parallel along the length of the filter, the intensity in different horizontal rows can be varied. Using multiple ultraviolet radiation sources arranged in horizontal rows, the intensity variation along the length of the filter is advantageously achieved. Preferably, a UV LED source is used, wherein the source can be in the form of a fluorescent tube. The fluorescent tube can extend horizontally along the length of the filter, and can also extend vertically along the length of the filter, wherein the wavelength and / or intensity of the ultraviolet radiation can vary along the length of the fluorescent tube. In a preferred embodiment, multiple ultraviolet radiation sources in the form of UV LED fluorescent tubes can be used.

[0021] The intensity of the UV radiation can vary linearly or non-linearly, especially when using UV LED fluorescent tubes. The intensity of the UV radiation can vary linearly, that is, the intensity of multiple UV radiation sources increases or decreases linearly along the length of the filter. As mentioned earlier, it may be advantageous to have a sharp decrease or increase at the end of the filter, depending on the flow rate and contamination level of the liquid. This will form a non-linear relationship between the intensity of the radiation sources.

[0022] According to a preferred embodiment of the present invention, at least one additional ultraviolet radiation source is arranged on a side of the filter opposite to the ultraviolet radiation source. The additional ultraviolet radiation source can advantageously be arranged on a side of the filter opposite to the ultraviolet radiation source. Preferably, the opposite side of the filter is the side from which the filtered liquid flows out of the filter.

[0023] The additional UV radiation source can reduce the risk of contaminated liquid flowing back into the food processing machine. The liquid flows out of the filter and flows to the outlet, wherein the additional UV radiation source is arranged inside to maximize efficiency. In a further preferred embodiment, it may be advantageous to arrange additional multiple UV radiation sources of different intensities on the opposite side.

[0024] Additional ultraviolet radiation illuminates an additional filter surface, wherein the filter surface is defined by the same length, width and height as the filter surface, but is located on an opposite side of the filter.

[0025] According to a preferred embodiment of the invention, the incoming liquid is a marinade or salt solution, in particular brine. These named liquids are mainly used in the food processing industry, wherein the liquid is mainly injected or sprayed onto the food, or the food is inserted into the liquid stream of the liquid. In a preferred embodiment, every liquid used for treating food in the food processing industry can be filtered and sterilized using the given equipment. The brine is usually an aqueous solution containing salt and / or other functional and / or flavoring substances in any given concentration.

[0026] According to another preferred embodiment of the present invention, the filter comprises a plurality of parts, wherein the number of openings and / or the diameter of the openings of the filter vary between the parts. The filter may have different parts, wherein within these parts, the number of openings, the diameter of the openings or the cross-sectional area may vary or be the same. Preferably, one part or all parts may not have openings, wherein, in this way, the time for the liquid to be exposed to ultraviolet radiation may be increased. The part is preferably placed at the starting position of the filter, because in terms of the length of the filter and the liquid advancing along the filter, the pollution concentration of the liquid is the highest at the starting position of the filter, so it is most desirable to increase the time for exposure to ultraviolet radiation at the starting position of the filter. In addition, the cross-sectional area of ​​the opening may vary. The cross section of the opening may be rectangular (rectangular), circular, elliptical or triangular or any other shape. The cross-sectional area and the number of the openings may be adjusted according to the viscosity of the liquid to be filtered. Compared with low-viscosity liquids, viscous liquids may require more openings with larger cross-sectional areas.

[0027] Preferably, the number of openings increases as the filter length increases. This achieves advantageously more exposure time to UV radiation.

[0028] Between each section, small areas without any openings may be arranged in order to increase the stability of the filter. From a horizontal perspective, the end of the filter may include more openings, wherein at this point the liquid may need less disinfection. Depending on the fluid to be filtered and the particles inside the fluid, the diameter or cross-section of the openings of the filter may also preferably vary.

[0029] Alternatively, preferably, the filter is designed with slots, each of which has a main extension direction parallel to the length of the filter. Such a filter element can achieve a good filtering effect without clogging. The filter element can be easily cleaned. Preferably, the width of the filter is the same as the width of the filter unit, so as to prevent liquid from flowing through the filter without being filtered.

[0030] In a further optional embodiment, the filter unit may include at least one plate element without any openings, which may be arranged in parallel with the filter. Therefore, the plate element may be arranged between the liquid flow and the filter, wherein the liquid will flow through the plate element and be exposed to ultraviolet radiation before being filtered. The plate element may have the same length, width and shape as the filter, or may be only a portion of the filter length or width. A preferred embodiment may include a plate element arranged relative to the filter, wherein the plate element may start from an overflow weir and end at the opposite wall of the filter unit, wherein the filter may start below the plate element at the opposite wall of the filter unit, and be arranged to end below the overflow weir. This will cause the liquid to be first disinfected by ultraviolet radiation, and then the liquid will be filtered. The plate element may be arranged in parallel with the filter and / or any ultraviolet radiation source.

[0031] In a preferred embodiment, wherein the width of the filter unit is greater than the width of the filter, the filter unit may include a baffle to prevent liquid from passing through any gap between the filter and any side of the filter unit, the gap being formed due to the difference in width between the filter unit and the filter. The baffle may be a wall arranged on the filter to prevent liquid from flowing through any side of the filter, or may be any plate or object that blocks liquid from flowing from the side of the filter. These devices may further be used to set any support element for the ultraviolet radiation source.

[0032] Preferably, the filter is at least partially, preferably entirely, inclined relative to a vertical plane and / or a horizontal plane. Due to this inclination, the liquid does not need to be pumped, but flows along the filter by gravity. The angle of inclination can vary with the flow length of the liquid. Preferably, the angle of inclination relative to the horizontal plane decreases with increasing flow length. The angle of inclination is preferably between 0° and 90°, more preferably between 0° and 20°. The angle of inclination affects the flow rate of the liquid on the filter and, in combination with the cross-sectional area of ​​the filter openings and the number of filter openings, affects the time of exposure to ultraviolet radiation.

[0033] Preferably, the filter is at least partially curved. In the filter design, the bending radius can vary over a wide range, preferably between 800mm and 8000mm, more preferably between 1000mm and 3000mm. Unfiltered liquid can flow along the filter by gravity and / or be pumped along the filter. The filtered liquid is forced through the filter element by gravity and / or increased pressure, which, according to a preferred embodiment, can be controlled. For example, the increased pressure can be achieved by a higher liquid level above the filter. The pressure level does not need to remain consistent over the entire flow length of the filter, but can vary.

[0034] According to another preferred embodiment of the present invention, the filter comprises a flow bend, wherein the flow bend is arranged in the surface of the filter, and is in an angle range of 0° to 90°, in particular in an angle range of 45° to 70°, with the direction of flow of the liquid along the filter. The flow bend can be arranged at any position of the filter and can be of any shape. The main effect achieved by the flow bend is to reduce the flow velocity along the filter. Therefore, more exposure time to ultraviolet radiation is generated, and thus a better disinfection effect of the liquid is achieved. The flow bend can further cause turbulence in the liquid flow, so that a homogenized liquid is produced, thereby achieving a better disinfection of the liquid as a whole. The flow bend can be arranged between different parts of the filter.

[0035] According to another preferred embodiment of the present invention, the filter unit comprises a collecting tank for collecting the outflowing liquid. The collecting tank can be arranged between the outlet and the food processing machine, wherein the filter unit can be connected to the collecting tank via a pipe or a tube. Furthermore, the collecting tank is preferably connected to the food processing machine via a pipe or a tube. The collecting tank can collect the filtered and sterilized liquid before letting it re-enter the food processing machine.

[0036] Advantageously, the filtered and sterilized liquid may be tested for any microorganisms or undesirable impurities before it is re-entered into the food processing machine.

[0037] In another preferred embodiment, the filtration unit comprises an additional collecting tank, wherein the collecting tank is located between the inlet and the food processing machine. Before entering the filtration unit, the liquid can be tested and the intensity and height of the UV radiation source and the filter can be selected according to the degree of contamination in the liquid and the size of the particles included.

[0038] In a further preferred embodiment, the filtration unit comprises only one total collection tank. The total collection tank can act as a collection tank and an additional collection tank at the same time. A total collection tank may be advantageous when the filtration unit requires a minimum liquid level to operate. In addition, the outflowing liquid can be filtered and sterilized again to achieve no residual microorganisms in the liquid. A pump can be used in conjunction with any tank to generate pressure and cause the liquid to flow out of the tank. Preferably, the ultraviolet radiation irradiates the filter only when the pump in the tank is running. In a preferred embodiment, in which a food processing machine is directly connected to the filtration unit fluid, the ultraviolet radiation source will only be turned on when the food processing machine is running. The ultraviolet radiation source can be linked to any machine important for food processing, wherein the machine can indicate that the liquid needs to be sterilized and filtered.

[0039] According to another preferred embodiment of the present invention, the filter unit comprises an overflow weir and a regulating valve for controlling the liquid to overflow the overflow weir. The overflow weir enables the filter unit to collect a given amount of liquid and achieves a controlled flow on the filter. When the overflow weir is full, the collected liquid will overflow the overflow weir and flow to the filter. In an optional embodiment, the liquid flow can be controlled by a regulating pump. This feature can be used in combination with the overflow weir and the regulating valve, or only in combination with either the overflow weir or the regulating valve, or not in combination with both.

[0040] In addition, when the overflow weir fills quickly and the flow rate to the filter is too high, the regulating valve allows a controlled flow rate. The height of the overflow weir determines the amount of incoming liquid that can be collected in the reservoir. The regulating valve can be adjusted manually or via an electric actuator. The electric actuator can be controlled by sensor data from a flow sensor or other sensor that allows the flow rate to be calculated.

[0041] In a further advantageous manner, the regulating valve can also be considered as a protective layer for the UV radiation source. If the radiation source is arranged close to the liquid flow, the liquid flow cannot reach a certain height. Furthermore, the regulating valve can act as a splash guard for the UV radiation source. These radiation sources can be negatively affected by a layer of dirt dried on the radiation source, which reduces the efficiency. Splashing of liquid or more liquid on the radiation source can lead to refraction after drying on the radiation source surface.

[0042] According to another preferred embodiment of the invention, the disinfection device comprises an ozone inlet, wherein the inlet is configured to inject ozone in gaseous form or dissolved in water into the filter unit. Ozone disinfection can be used in combination with ultraviolet radiation. Ozone can enter the filter unit in gaseous form through a valve or be sprayed onto the liquid via a nozzle, wherein the ozone is dissolved in water. For the combined use of ultraviolet radiation and ozone, special protective measures may be required, wherein, in a preferred embodiment, these protective measures are contained in the filter unit.

[0043] According to a preferred embodiment of the invention, the filtration unit comprises a cooling device, which is located between the food processing machine and the outlet. Higher temperatures create an ideal environment for the growth of undesirable microorganisms. In particular, when the liquid is not directly reused after filtration and disinfection, the combination of residence time and higher temperature may accelerate the growth of microorganisms. Therefore, cooling the liquid allows for more residence time for recycling and cooling the liquid. Preferably, the cooling device can also be arranged in a general collection tank, wherein the general collection tank receives and / or collects the incoming and outgoing liquid. Therefore, the incoming and outgoing liquid can be cooled.

[0044] Another preferred embodiment comprises a cooling device and a collection tank, the cooling device being located between the outlet and the collection tank. Preferably, a second cooling device is located between the inlet and the food processing machine. For highly contaminated liquids, the cooling device can advantageously prevent the rapid reproduction of any microorganisms before entering the filtration unit and advantageously prevent the presence of a large number of microorganisms in the filtration unit. The cooling device preferably cools the liquid to 2-4°C and / or maintains the liquid within this temperature range. Preferably, the cooling device comprises a pump that pumps the recovered liquid from the reservoir to the food processing machine.

[0045] According to a preferred embodiment of the invention, the filter unit comprises a protective layer, which is located between the filter and the UV radiation source, wherein the protective layer allows the UV radiation to pass through. The protective layer can protect the radiation source from liquid splashes or liquids. The risk of reduced efficiency due to drying of any liquid residues on the UV radiation source is greatly reduced. The protective layer can be made of glass, plastic or any material suitable for food use and transparent to UV rays.

[0046] Preferably, the protective layer is detachable and height-adjustable. The height of the protective layer can also be adjusted depending on the height of the UV radiation source and the height of the liquid on the filter. In addition, the protective layer is detachable for cleaning purposes because dried liquid on the protective layer may cause refraction and reduce the disinfection efficiency.

[0047] The invention further relates to a method for treating a liquid by means of a filter unit according to the invention, wherein the liquid is filtered and simultaneously irradiated with ultraviolet radiation. Preferably, in a first step, the liquid enters the filter unit through an inlet; in a second step, the incoming liquid flows through and passes through the filter, forming a mixed surface of the liquid to be filtered and the residues. For the purpose of disinfection, the surface of the filter can be irradiated with ultraviolet radiation at the same time. The liquid is forced through the filter via gravity and the pressure caused by the pressure generated by the liquid on the filter. In a final step, the liquid preferably flows out of the filter unit via an outlet, wherein the bottom of the filter unit can be slightly tilted so that the liquid flows out through the outlet only via gravity. This method allows efficient filtration and disinfection of any liquid, while allowing rapid disassembly and cleaning of the unit.

[0048] According to another preferred embodiment of the method according to the invention, the outflowing liquid is collected in a tank located between the outlet and the food processing machine.

[0049] According to another preferred embodiment of the method according to the invention, in a first step, liquid flowing out of the food processing machine is collected in a collecting tank, wherein in a second step, the liquid in the collecting tank flows to the filtering unit. The collecting tank may include a cooling or heating device to cool or heat the liquid in the collecting tank.

[0050] According to another preferred embodiment of the method according to the invention, the outflowing liquid flows directly into the food processing machine.

[0051] According to another preferred embodiment of the method according to the invention, the outflowing liquid is cooled immediately after leaving the filter unit.

[0052] Preferably, a mixture of liquid and residue is formed on the filter surface.

[0053] With regard to the method, the advantageous features and embodiments described in connection with the filter unit according to the invention may be applied alone or in combination to the advantageous embodiments of the method, as an alternative or in addition to the advantageous embodiments of the method. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The present invention is now described with reference to the accompanying drawings, which do not limit the protection scope of the present invention.

[0055] Figure 1 The filter unit of the present invention is shown.

[0056] Figure 2 A first embodiment of a filter unit is shown.

[0057] Figure 3 A second embodiment of a filter unit is shown.

[0058] Figure 4 A third embodiment of a filter unit is shown.

[0059] Figure 5 A cooling device is shown in combination with the filter unit of the invention.

[0060] Figure 6a and Figure 6b An exemplary embodiment of a filter for use within a filtration unit is shown.

[0061] Figure 7a and Figure 7b An exemplary embodiment of a filter for use within a filtration unit is shown.

[0062] Figure 8a and Figure 8b An exemplary embodiment of a filter for use within a filtration unit is shown.

[0063] Fig. 9 A fourth embodiment of a filter unit is shown. DETAILED DESCRIPTION

[0064] Figure 1The filter unit 1 of the present invention is shown. The filter unit 1 comprises an inlet 2, an outlet 3, a filter 7 and a disinfection device 10. The liquid 12 to be treated enters the filter unit 1 via the inlet 2. The liquid 12 can be any liquid that needs to be treated from any food processing machine. In particular, the incoming liquid 12 can be a marinade or a salt solution, wherein the salt solution is preferably salt water. The incoming liquid 12 can be collected in the reservoir 4, wherein the height of the overflow weir 5 defines the amount of collected liquid. After the liquid reaches a maximum threshold in the reservoir 4, the liquid flow 15 overflows the overflow weir and flows to the filter 7. The liquid can spread over the entire width of the filter 7 and advance along the length x of the filter. Figure 1 The disinfection device 10 shown in the figure comprises an ultraviolet radiation source 10'. The radiation source irradiates the filter surface 7' with ultraviolet radiation 100, while the liquid to be disinfected flows over it. In addition, the filter unit 1 comprises an inclined bottom 8, wherein the liquid flow 17 through the filter flows along the inclined bottom 8 by gravity. The filtered and disinfected liquid flows out of the filter unit 1 via the outlet 3. Furthermore, Figure 1 A residue tank 9 is shown for collecting residue 9 from the filter 7. Grease, fat and particles filtered from the liquid flow into the residue tank 9 via gravity. The filter 7 can be tilted at an angle α relative to the vertical plane so as to exert greater forces on the liquid and residue via pressure and gravity. In order to control the flow rate on the filter 7 and protect the disinfection device 10, the system can include a regulating valve 6. The regulating valve 6 is adjusted by controlling the distance from the filter 7, thereby opening a smaller or larger area for the liquid to pass through. Preferably, for highly contaminated liquids, the regulating valve 6 is adjusted to achieve a smaller flow rate so that the liquid can be disinfected accordingly.

[0065] Figure 2 The first embodiment of the present invention is shown. Figure 1 , Figure 2 It also includes a protective layer 40 and a food processing machine 30. Contaminated liquid flows out of the food processing machine 30 and can enter the filter unit 1 via the inlet 2. The sterilized and filtered liquid flows out of the filter unit 1 through the outlet 3 and can flow directly back to the food processing machine 30, or be transported to a collection tank or other processing machine, or any combination of the above. Figure 2The protective layer 40 shown in the Figure allows the UV radiation 100 to pass through, but prevents any liquid from splashing onto the UV radiation source 10'. The protective layer 40 can be made of glass, plastic, or a material that meets the above characteristics. Since the height of the UV radiation source 10' can be adjusted, the height of the protective layer 40 can also be adjusted. When the UV radiation source 10' is placed away from the filter, the protective layer can also be placed farther away. The protective layer 40 is removable because at low flow rates, it may not be necessary to protect the UV radiation source 10', and it may not be necessary to accept any efficiency loss caused by a dirty protective layer 40. The protective layer 40 may be more advantageous when an embodiment of the present invention includes an ozone inlet. The ozone inlet can inject gaseous ozone or spray ozone dissolved in water onto the filter, wherein the nozzle of the inlet needs to be kept clean and prevented from clogging.

[0066] Figure 3 A second embodiment of the invention is shown, wherein a plurality of UV radiation sources 10' are shown. Furthermore, this embodiment shows that the filter 7 is tilted at a very high angle relative to the vertical plane. This embodiment does not show a residue trough 9 for collecting the residue. The residue cannot pass through the filter 7 and is therefore retained on the filter 7. A positive side effect of the invention is that the residue is sterilized at the same time as the liquid. This allows the residue to be stored for a longer time before it needs to be disposed of. Furthermore, the residue trough 9 and any container for collecting the residue also have a lower risk of having microorganisms inside after exposure to the residue. Preferably, when the function of the filter 7 is limited by the residue on the filter 7, the filter 7 can be removed and the residue dumped into the trough. Further preferably, a cleaning machine in the form of a vacuum cleaner or any pump can be placed on the filter 7 and extract the residue from the filter surface 7'. Since there are no residual microorganisms in the residue, difficult-to-clean machines used in conjunction with the residue are also subject to a lower risk of contamination.

[0067] A plurality of ultraviolet radiation sources 10' may be arranged along the length x of the filter. The height of the ultraviolet radiation sources 10' may be adjusted manually or by an electric motor, wherein sensor data including the liquid flow rate and the degree of contamination of the liquid are input into a processing unit which may control the electric motor. In addition, the intensity of the radiation sources 10' may be adjusted and varied between the plurality of radiation sources 10'. In areas of high contamination, typically at the start of the filter (x=0), the intensity may be higher. As the filter length x increases, the intensity of the plurality of filters may decrease linearly or nonlinearly. It may be assumed that as the liquid is exposed to the ultraviolet radiation 100 for an increasing period of time, the degree of contamination of the liquid also decreases, thereby achieving a decrease in the intensity of the ultraviolet radiation 100 at the end of the filter 7. In a preferred embodiment, the ultraviolet radiation sources 10' may be suspended from the upper half of the filter unit 1. The upper half of the filter unit 1 may be detachable, and when removed, the cleaning of the filter 7 and the filter unit 1 is easier.

[0068] Different from the other embodiments shown, Figure 3 The outlet 3 shown in the figure can be arranged on the opposite side of the inlet. The inclined bottom 8 is inclined towards the outlet 3, wherein this is due to the relatively shallow embodiment. As long as the inclined bottom 8 can be inclined towards the outlet 3, the outlet 3 can be arranged on any side of the filter unit 1.

[0069] Figure 4 Another preferred embodiment is shown, comprising an additional UV radiation source 10", wherein the radiation source 10" is located on the side of the filter 7 opposite to the UV radiation source 10'. The additional UV radiation source 10" can be arranged in the liquid flow 17 through the filter, wherein any microorganisms remaining in the liquid flow 17 through the filter can be disinfected by the additional UV radiation source 10". In another preferred embodiment, multiple additional UV radiation sources 10" can be arranged in the liquid flow 17 through the filter. The UV radiation source 10' irradiates an additional surface 7" of the filter, wherein the additional surface 7" is located on the side of the filter opposite to the filtering surface 7'. Placing additional UV radiation sources 10" in the liquid flow 17 through the filter may result in more cleaning steps for the radiation sources 10". Any liquid drying on the radiation source may result in a reduced efficiency of the radiation source 10' or 10".

[0070] Figure 5An embodiment of the present invention incorporating a cooling device 20 is shown. The cooling device 20 is arranged between the outlet 3 and the food processing machine 30. Furthermore, a collecting tank may be arranged between the cooling device 20 and the food processing machine 30. When the outflowing liquid 13 is cooled to prevent the multiplication of microorganisms, it may be advantageous to collect the outflowing liquid 13. The cooling device 20 may comprise a pump in order to pump the cooled liquid back to the food processing machine 30. Preferably, the cooling device 20 may cool the liquid to 2°C–4°C. The collecting tank and the cooling device may each comprise a pump, wherein one pump is particularly used for cooling purposes and one pump is particularly used for circulation purposes.

[0071] Figure 6a , Figure 6b as well as Figure 7a , Figure 7b An exemplary embodiment of a filter 7 within a filter unit 1 is shown. Figure 6a An embodiment of the filter 7 is shown. In this example, the filter 7 is at least partially curved and at least partially inclined relative to the horizontal plane. Unfiltered liquid flows along the filter 7, as shown by the arrow x. The area in contact with the liquid is the filtration area 72. In this area, at least one narrow groove 71 is provided, preferably a plurality of narrow grooves, here four narrow grooves 71. The narrow grooves 71 preferably extend parallel to the liquid flow direction. Each narrow groove has a main extension direction, which is preferably parallel to the liquid flow direction X. The narrow grooves are preferably arranged at equal intervals and more preferably have the same width w and / or length. The width is preferably 0.4mm-3.0mm. The length of the filter 7 is preferably 500mm-2000mm. All narrow grooves preferably cover 10%-60% of the filtration area 72. In Figure 6b In the filter 7, the slots are interrupted for strength and rigidity reasons. In another preferred embodiment, the slots on the filter 7 can be openings with a circular cross section or other different shapes. The area of ​​the cross section can be varied depending on the degree of contamination of the liquid. The degree of contamination of the liquid can be tested before letting it enter the filter unit, and the intensity and height of the ultraviolet radiation sources 10', 10" as well as the filter 7 and the openings can be selected based on the results. Figure 6b Further shown are different sections 73 on the filter, wherein each section may include openings of different shapes or numbers. The number of openings may be increased along the length x of the filter, since the liquid is exposed to the ultraviolet radiation 100 for less time. The flow bend 74 on the filter 7 may increase the exposure time to the ultraviolet radiation 100 by reducing the flow rate of the liquid. The bend 74 is arranged at an angle to the liquid flow, and the shape of the object used as the bend 74 may vary.

[0072] Figure 7aAn embodiment of a filter 7 is shown, wherein the filter 7 is straight, rather than curved. The filter 7 may consist of a plurality of straight elements connected to one another, wherein the relative angles between the plurality of elements may vary. Figure 7b In the embodiment of the invention, the slots are interrupted and the filter comprises flow bends.

[0073] Embodiments not shown include a combination of curved filter elements connected to straight filter elements in order to direct the flow direction X of the liquid as desired.

[0074] In all the shown embodiments the slots extend along the flow direction X of the liquid, however the invention will also cover slots oriented at slightly different angles relative to the flow direction X, preferably between 0 and 90 degrees.

[0075] Figure 8a and Figure 8b A further embodiment of a filter 7 is shown, in which the openings 71 (slots) for filtering purposes only start at a given length x along the filter. Figure 8a and Figure 8b The filters shown in both are curved, but this feature can also be used for filters of any shape, where the openings 71 only start at a given length x along the filter. Advantageously, this feature can better sterilize the desired liquid because there are no openings 71 at the beginning of the filter, through which the liquid cannot pass, and the exposure time to the ultraviolet radiation 100 is increased.

[0076] Fig. 9 Another embodiment of the present invention is shown. Figures 1 to 3 In the disclosure of . In the present example, the length extension of the ultraviolet radiation source, i.e. the length extension of the disinfection device, extends substantially parallel to the flow of the liquid and / or the length of the filtering surface. Preferably, the disinfection device comprises a plurality of ultraviolet radiation sources (not shown). The plurality of ultraviolet radiation sources can emit ultraviolet radiation of different intensities and / or wavelengths, or emit ultraviolet radiation of the same intensity and / or wavelength. The plurality of ultraviolet radiation sources can be arranged substantially parallel to the flow of the liquid and / or the length of the filtering surface. Each source can be individually controlled according to amplitude and / or wavelength.

[0077] Reference numerals

[0078] 1: Filter unit

[0079] 2: Entrance

[0080] 3: Export

[0081] 4: Liquid reservoir

[0082] 5: Overflow weir

[0083] 6: Regulating valve

[0084] 7: Filter

[0085] 7': Filter surface exposed to UV radiation

[0086] 7”: Additional surfaces exposed to UV radiation

[0087] 8: Tilt bottom

[0088] 9: Residue tank

[0089] 10: Disinfection device

[0090] 10': UV radiation source

[0091] 10”: Additional sources of UV radiation

[0092] 12: Incoming liquid

[0093] 13: Flowing liquid

[0094] 15: Liquid flow over overflow weir

[0095] 17: Liquid flow through the filter

[0096] 19: Residue

[0097] 20: Cooling device

[0098] 30: Food processing machines

[0099] 40: Protective layer

[0100] 71: Opening

[0101] 72: Filter area

[0102] 73: Filter section

[0103] 74: Flow Bend

[0104] 100: Ultraviolet radiation

[0105] x: liquid flow direction, flow length, main extension direction

[0106] α: The tilt angle relative to the vertical plane

Claims

1. A filter unit (1) for treating a liquid, wherein the filter unit (1) comprises an inlet (2), an outlet (3), a filter (7) and a disinfection device (10), wherein the inlet (2) and the outlet (3) are each connected to a food processing machine (30), the disinfection device (10) comprising an ultraviolet radiation source (10), characterized in that It (10) is configured to irradiate ultraviolet radiation (100) towards the filter surface (7').

2. The filter unit (1) according to one of the preceding claims, characterized in that The disinfection device (10) comprises a plurality of ultraviolet radiation sources (10').

3. The filter unit (1) according to claim 2, characterized in that The plurality of ultraviolet radiation sources (10') are arranged along the length (x) of the filter (7).

4. Filter unit (1) according to one of the preceding claims, characterized in that The plurality of ultraviolet radiation sources (10') are configured to emit ultraviolet radiation (100) of different and / or same intensities and / or different and / or same wavelengths.

5. The filter unit (1) according to claim 2, characterized in that At least one further ultraviolet radiation source (10") is arranged on the side of the filter (7) opposite to the ultraviolet radiation source (10').

6. The filter unit (1) according to claim 5, characterized in that The at least one further UV radiation source (10") irradiates a further surface of the filter (7").

7. Filter unit (1) according to one of the preceding claims, characterized in that The incoming liquid (12) is a marinade or salt solution, in particular brine.

8. Filter unit (1) according to one of the preceding claims, characterized in that The filter (7) comprises a plurality of sections, wherein the number of openings and / or the diameter of the openings of the filter (7) varies between the plurality of sections.

9. Filter unit (1) according to one of the preceding claims, characterized in that The filter (7) comprises a flow bend, wherein the flow bend is arranged in the surface of the filter (7') at an angle in the range of 0°-90°, in particular in the range of 45°-70°, to the direction of liquid flow along the filter (7).

10. Filter unit (1) according to one of the preceding claims, characterized in that The filter unit (1) comprises a collecting tank for collecting the outflowing liquid (13).

11. Filter unit (1) according to one of the preceding claims, characterized in that The filter unit (1) comprises an overflow weir (5) and a regulating valve (6) for controlling the liquid flow (15) overflowing the overflow weir.

12. Filter unit (1) according to one of the preceding claims, characterized in that The disinfection device (10) comprises an ozone inlet, wherein the inlet is configured to inject ozone into the filter unit (1) in gaseous form or in a form dissolved in water.

13. Filter unit (1) according to one of the preceding claims, characterized in that The filtering unit (1) comprises a cooling device (20), which is located between the food processing machine (30) and the outlet (3).

14. Filter unit (1) according to one of the preceding claims, characterized in that The filter unit (1) comprises a protective layer (40) between the filter (7) and the ultraviolet radiation source (10'), wherein the protective layer (40) allows the ultraviolet radiation (100) to pass through.

15. A method for treating a liquid by means of a filter unit (1) according to claim 1, characterized in that The liquid is filtered and simultaneously irradiated with ultraviolet radiation (100).

16. A method for treating a liquid by means of a filter unit (1) according to claim 1, characterized in that In a first step, liquid flowing out of a food processing machine (30) is collected in a collecting tank, and in a second step, the liquid in the collecting tank flows toward the filtering unit (1).

17. The method for treating liquid according to claim 15, characterized in that: The outflowing liquid (13) is collected in a tank located between the outlet (3) and the food processing machine (30).

18. The method for treating liquid according to claim 15, characterized in that: The outflowing liquid (13) flows directly into the food processing machine (30).

19. Method for treating a liquid according to one of the preceding claims, characterized in that The outflowing liquid (13) is cooled immediately after leaving the filter unit (1).

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