Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/13—Supported filter elements
  • B01D29/15—Supported filter elements arranged for inward flow filtration
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D39/00—Filtering material for liquid or gaseous fluids
  • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/13—Supported filter elements
  • B01D29/15—Supported filter elements arranged for inward flow filtration
  • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/13—Supported filter elements
  • B01D29/23—Supported filter elements arranged for outward flow filtration
  • B01D29/27—Filter bags
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
  • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
  • B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
  • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
  • B01D35/26—Filters with built-in pumps filters provided with a pump mounted in or on the casing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D39/00—Filtering material for liquid or gaseous fluids
  • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
  • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
  • E04H4/00—Swimming or splash baths or pools
  • E04H4/12—Devices or arrangements for circulating water, i.e. devices for removal of polluted water, cleaning baths or for water treatment
  • E04H4/1209—Treatment of water for swimming pools
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
  • E04H4/00—Swimming or splash baths or pools
  • E04H4/12—Devices or arrangements for circulating water, i.e. devices for removal of polluted water, cleaning baths or for water treatment
  • E04H4/1209—Treatment of water for swimming pools
  • E04H4/1218—Devices for removal of polluted water; Circumferential gutters
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2101/00—Nature of the contaminant
  • C02F2101/10—Inorganic compounds
  • C02F2101/20—Heavy metals or heavy metal compounds
  • C02F2101/203—Iron or iron compound
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2101/00—Nature of the contaminant
  • C02F2101/10—Inorganic compounds
  • C02F2101/20—Heavy metals or heavy metal compounds
  • C02F2101/206—Manganese or manganese compounds
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
  • C02F2103/42—Nature of the water, waste water, sewage or sludge to be treated from bathing facilities, e.g. swimming pools
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2201/00—Apparatus for treatment of water, waste water or sewage
  • C02F2201/002—Construction details of the apparatus
  • C02F2201/006—Cartridges

Definitions

• the present invention relates to an additional filter for an existing cartridge- like pool filter of a pool, said pool being filled with water from a source containing metal compounds via a piping system, and comprising a circulation loop that contains a pump having a filter housing for the filter cartridge, for separating visible organic matter from the pool water circulating
• the pool water contains metal compounds originating from said source and piping system and causing the pool water, after a certain period of use, to become discoloured by coloured particles formed in the pool water.
• the invention also relates to a method of removing water-discolouring particles from water in a pool, which is filled with water from a source, that contains metal compounds, via a piping system, said pool comprising a circulation loop, that contains a pump having a filter housing for a filter cartridge for separating visible organic matter from the pool water circulating
• pool water contains metal compounds originating from said source and piping system and causing the pool water, after a certain period of use, to become discoloured by said coloured particles formed in the pool water.
• Pools such as outdoor pools, indoor pools, whirlpools and the like, which are filled with water from a well or lake via a piping system in the ground, will contain different metal compounds such as iron, copper and manganese compounds, and others, and usually also calcium compounds.
• bactericidal agents such as chlorine or a chlorine-releasing chlorine compound, are added to the water in the pool to kill bacteria therein.
• the pool water After a certain time, depending on the composition of the well water, the pool water becomes discoloured so that it turns blue, green, brown, reddish- -brown, black or blackish-brown.
• the pool manufacturers propose or recommend that the water in the pool is subjected to shock- treatment with chlorine. Such a chlorine treatment, however, does not give the desired result and is
• Another possibility is to provide expensive special filters for removing the discolouring matter, but because of, among other things, the price of
• the pool is completely or partially filled with municipal water, for example by getting the rescue corps to handle the filling by means of a water tanker. Also this
• the object of the invention is to solve the above- -mentioned problems and to provide an additional filter, for the regular pool filter, which is cheap and efficient to use for removing the discolouration and achieving a clearer or completely clear water in a relatively short time .
• the additional filter comprises a plurality of water-permeable filter layers of a thin fabric material contacting each other, and is dimensioned and designed to be fitted around the existing filter cartridge in order to completely enclose the filter cartridge with a main portion, and
• each filter layer has, on the one hand, larger apertures, wherein some of the larger apertures of the filter layers are completely or partially aligned with each other to form throughflowing passages for the circulating water, and, on the other hand, smaller apertures of varying sizes, that prevent passage of the water-discolouring particles which are distributed within a specific size range, the upper value of which constitutes a limit value for the transition between said larger apertures and said smaller apertures.
• an additional filter that comprises a plurality of water-permeable filter layers of a thin fabric material contacting each other, is fitted around the removed filter cartridge in order to completely enclose the filter cartridge with a main portion, said filter layers each having, on the one hand, larger apertures, wherein some of the larger apertures of the filter layers are completely or partially aligned with each other to form throughflowing passages for the
• said predetermined period of time is within 24+6 hours.
• the procedure is repeated 3-6 times, more preferably 4-5 times.
• At least some of said larger apertures are of sizes forming said flow passages, in order to allow a high water permeability so that the flow rate in said circulation loop is minimally influenced.
• said smaller apertures comprise small apertures of varying sizes, preventing passage of water- -discolouring particles larger than about 30 microns, said particles thereby being trapped and retained by the filter layers.
• said limit value is about 600 microns.
• the additional filter is designed as a sleeve having end portions, defining opposite end openings, wherein the filter cartridge is adapted to be inserted through one of these end openings to form a filter assembly for positioning in a filter chamber in the filter housing. It has surprisingly been found that the additional filter according to the invention removes the discolouration of the pool water in an efficient manner, and this in a relatively short time, usually less than 5 days.
• the pool water has a relatively large free surface that is exposed to the surrounding air, causing the oxygenation of the pool water to be increased. Also the circulation of the pool water through the circulation loop contributes to increased oxygenation of the pool water. The metal compounds, which are present in the pool water after having filled the pool, will then be
• the well water usually contains calcium compounds, which are also oxidized to calcium oxide, wherein particles of calcium oxide can absorb colouring particles of said metal oxides, which also can contribute to an increased colour intensity and thus an increased degree of discolouration of the pool water.
• chlorine ions or other acidic ions, originating from bactericidal agents added to the pool water, can participate in the chemical reactions leading to the discolouration.
• Figure 2 is an exploded view of the pump of Figure 1.
• Figures 3 and 4 show an additional filter according to the invention.
• Figure 4a is an enlargement in the scale 1:7 of a portion of an outer filter layer of the additional filter in Figure 4.
• Figures 5 and 6 show the additional filter of Figures 3 and 4 enclosing the pool filter of Figure 1 partly and completely, respectively.
• Figure 1 shows part of an outdoor pool, which comprises a pool 1 and an external circulation loop 2 for purifying the water in the pool with respect to larger, visible, solid particles.
• the circulation loop contains a pump 3 and a discharge hose 4 and a feed hose 5.
• the discharge hose 4 is connected to an outlet 6 of the pool 1 and an inlet 7 of the pump 3
• the feed hose 5 is connected to an outlet 8 of the pump 3 and an inlet 9 of the pool 1.
• the inlet 7 is located vertically above the outlet 8.
• the pump 3 comprises a cylindrical filter housing 10, the central line of which is vertical and which is located vertically above the pump part itself.
• the filter housing 10 has an internal filter chamber 11, which consequently also has a cylinder shape and which has a central opening (not shown) at its bottom end in
• the filter chamber 11 has a side opening, connecting directly to the inlet 7 through the wall of the filter housing 10. During operation, the filter chamber 11 is kept sealed by means of a top cover 12, which is screwed to the upper end portion of the filter housing 10. In the filter chamber 11, there is a
• cylindrical pool filter 13 in the form of a removable pool filter cartridge, the upper end opening 14 of which is kept sealed during operation by means of the top cover 12, so that no water is allowed to pass through this upper end opening 14 from the outside of the pool filter 13, and the lower end opening (not shown) of which is in direct communication with said central opening in the bottom end of the filter chamber 11, against which the pool filter cartridge 13 lies in sealing contact.
• the diameter of the pool filter cartridge 13 is slightly smaller than the diameter of the filter chamber 11, so that an annular, free space is formed, between the inside of the filter housing 10 and the outside of the filter cartridge 13, through which water from the pool 1 can be distributed around the filter member 15 of the pool filter cartridge 13, so that the entire filter area can be used for through- flow of pool water through the pool filter cartridge 13 into its internal space.
• FIGS 3-6 show an additional filter 16 according to the invention, which is applied on the pool filter 15 when required, so that it completely encloses the filter member 15 of the pool filter 13.
• the additional filter 16 has the shape of a sleeve having opposite end openings 17, 18 with a diameter that is slightly smaller than the diameter of the pool filter 13, in order to form
• the end portions are provided with elastic ribbons, enabling the end openings 17, 18 to be widened so that the pool filter cartridge 13 easily can be inserted into the additional filter 16 through one of these end openings 17, 18.
• the additional filter 16 is so dimensioned relative to the size of the pool filter 13 that it, with a larger filter portion extending between the end portions 19, 20, will contact the pool filter 13 or be located relatively close
• the additional filter 16 is manufactured from two, or preferably more, air and water permeable filter layers of a pliable, non self-supporting, thin fabric material, which e.g. can consist of thin, short and/or long, straight and/or curved filaments or fibres of plastic, e.g. polypropylene, which are bonded together in an irregular pattern with apertures of varying size and shape between the filaments or fibres as is illustrated in Figure 4a.
• the multilayered additional filter has a high water permeability so that the flow rate of the pool water will be nearly the same as when the additional filter is not fitted on the pool filter 13.
• Each filter layer of the additional filter 16 comprises a first group of larger apertures, ensuring that continuous flow passages through all filter layers are formed, and a second group of smaller apertures, ensuring that the water- -discolouring particles are trapped in the filter layers, wherein these particles are distributed in a size range, where the upper value of particle size constitutes a limit and transition between said first group of larger apertures and second group of smaller apertures .
• an additional filter 16 having five separate filter layers of a thin fabric material of the above-described type was used, wherein said fabric material had a basis weight of approx. 20 g/m 2 .
• the trial showed that the flow rate decreased by only 0.1-0.2 % after the fitting of the five-layered additional filter 16.
• the additional filter 16 was removed.
• the additional filter 16 was rinsed with fresh water.
• the rinsing water was collected and the procedure was repeated for an additional period of 4 days, while using an entirely new, clean additional filter of the same type after each day's run.
• the rinsing water from the five rinses was collected and evaporated to obtain 2.73 g of a dry material of particles, wherein said material was sieved and analysed in order to determine the distribution of the particle size.
• the result was the following: Sieving analysis
• said upper value of particle size within said size range is thus about 600 microns.
• the lower value can be estimated to be about 30 microns (0.14 g passes through apertures smaller than 43 microns) .
• the sieved particulate material was collected and
• a X-ray Fluorescence Spectrophotometer designated
• the multilayered additional filter does not appreciably reduce the flow rate of the water, at the same time as the small water-discolouring
• particles typically between about 30 and about
• 600 microns can be captured and retained by the fabric layers.
• a probable explanation may be as follows: When several fabric filter layers, e.g. 5 of them, are placed against each other, some of the larger apertures, thus being greater than about 600 microns, will overlap each other completely or partially in certain places, and if the overlap is continuous through all the filter layers, i.e. from the outermost or first to the last or innermost filter layer, the thus overlapping apertures will form a flow passage for water, which accordingly passes through all the filter layers and then the permanent pool filter. Of course, some of the water-discolouring particles may be carried along with this water, but can, however, be captured during the next pass or passage of pool water.
• apertures thus being smaller than about 600 microns, and which initially let through water but gradually become blocked by particles in the specified size range of about 30-600 microns. It will be appreciated that some smaller particles can pass through apertures in said denser region, having sizes in the upper part of said size range, but then can get trapped in a similar region, which can be situated in the 4th and/or 5th filter layer. What has been described above also applies to a larger aperture, i.e. above about 600 microns, which is present in the first filter layer but lacks overlap with a larger aperture in the second filter layer, then instead having a denser region of the above-described type.
• a removal of an additional filter that has been in operation for 1 day will show particle accumulations on the outside of all layers.
• the particle range may vary depending on the ground conditions present in the area in question, where water is collected for the pool. In general, most particle sizes will be in the range of about 30-600 microns.
• a suitable fabric material is the one used as a plant protection cover in the cultivation of plants, said fabric material being air and water permeable and having a basis weight of about 20 g/m 2 .
• a fabric material exhibiting larger and smaller apertures of the indicated type, with a suitable area division into regions between them to achieve said effects, can also be manufactured separately, wherein a larger proportion of the smaller apertures preferably have a size of about 75 microns and below.
• the fabric material is pliable and has a low grammage weight, generally suitably about 15-40 g/m 2 .

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Architecture (AREA)
• Water Supply & Treatment (AREA)
• Structural Engineering (AREA)
• Civil Engineering (AREA)
• Textile Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Hydrology & Water Resources (AREA)
• Environmental & Geological Engineering (AREA)
• Organic Chemistry (AREA)
• Filtration Of Liquid (AREA)
• Filtering Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=43900534

Family Applications (1)

Country Status (3)

Family Cites Families (4)

• 2009
  • 2009-10-21 SE SE0901359A patent/SE534219C2/sv not_active IP Right Cessation
• 2010
  • 2010-10-11 EP EP10825273A patent/EP2491202A1/de not_active Withdrawn
  • 2010-10-11 WO PCT/SE2010/000240 patent/WO2011049502A1/en not_active Ceased

Non-Patent Citations (1)

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