EP2852451A1 - Continuous sand filter plant with fluid distributors - Google Patents
Continuous sand filter plant with fluid distributorsInfo
- Publication number
- EP2852451A1 EP2852451A1 EP13793691.0A EP13793691A EP2852451A1 EP 2852451 A1 EP2852451 A1 EP 2852451A1 EP 13793691 A EP13793691 A EP 13793691A EP 2852451 A1 EP2852451 A1 EP 2852451A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- filter plant
- fluid distributor
- plant according
- distributor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/38—Feed or discharge devices
- B01D24/40—Feed or discharge devices for feeding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/002—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/002—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection
- B01D24/005—Filters being divided into a plurality of cells or compartments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/28—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed moving during the filtration
- B01D24/30—Translation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4668—Regenerating the filtering material in the filter by moving the filtering element
- B01D24/4689—Displacement of the filtering material to a compartment of the filtering device for regeneration
Definitions
- the present invention relates generally to the treatment of
- the water/ wastewater needs to be purified.
- one such system may be a drinking water system where drinking water is produced from surface water and another system may be a municipal wastewater treatment wherein the wastewater needs to be treated so that it can be discharged or reused in industry or for irrigation and similar purposes.
- the sand In the air-lift pump, the sand is subjected to a thorough mechanical agitation by the action of the air bubbles within the pump such that the dirt is separated from the grains of sand.
- the separated dirt is rinsed from the sand in a sand washer near the top of the airlift pump, the sand washer being disposed concentrically around the upper part of the air-lift pump.
- the clean sand is returned to the top of the filter bed. Reject water is continuously removed from the sand washer and discharged from the sand filter whereas the filtrate exits from the sand filter as an overflow.
- Such sand filters can also be adapted for removing nitrogen from water. The presence of oxygen is needed for nitrification and COD reduction .
- Some prior art sand filters are therefore provided with an aerator. Process air is supplied by a blower or compressor and is admitted to the process via non-clogging aeration hoods in the filter.
- US 5,472,61 0 discloses an apparatus for blowing a gas into a granular filter bed comprising elongate hoods adapted for a single filter bed.
- An object of the present invention is to provide a new and improved continuous sand filter plant which is more cost efficient than prior art plants.
- a continuous sand filter plant comprising a plurality of filter modules and comprising at least one fluid distributor, characterized in that the at least one fluid distributor has a length adapted to extend across at least two filter modules.
- the at least one fluid distributor exhibits at least one straight section, which lends itself to easy manufacturing. It is also preferred that the fluid distributor is made of plastic.
- the at least one fluid distributor can be a water or a gas distributor, whereby the advantages of the invention can be applied to more than one application.
- the at least one fluid distributor is provided with a plurality of holes, whereby an even distribution of the fluid is achieved.
- the device comprises a first and a second fluid distributor, wherein the first fluid distributor is provided at a higher level than the second fluid distributor.
- a stable design is thereby achieved, wherein the upper level of the fluid distributors relieve the lower level from part of the pressure exerted by the filter bed material.
- each filter module is partly defined by a bottom cone. This is a suitable shape for providing a filter module.
- FIG. 1 is an overall view of a first embodiment of a filter plant according to the invention provided with a plurality of fluid distributors in the form of water and air distributors.
- FIG. 2 is a detailed side view of the filter plant shown in Fig. 1 .
- FIG. 3 is a detailed side view of the filter plant shown in Fig. 1 illustrating the operation thereof.
- FIG. 4 is a detailed end view of the filter plant shown in Fig. 1 .
- FIG. 5 is a detailed view of the filter plant shown in Fig. 1 .
- FIG. 6 is a detailed view of an air distributor comprised in the filter plant of Fig. 1 .
- FIG. 7 is an overall view of a second embodiment of a filter plant according to the invention provided with a plurality of fluid distributors in the form of water and air distributors.
- Fig. 8 is a detailed side view of the filter plant shown in Fig. 7.
- Fig. 9 is a detailed view of an alternative air distributor comprised in a filter plant.
- FIG. 1 0 and 1 1 are overall views of alternative embodiments of a filter plant comprising an air distributor in the form of a hose.
- FIG. 1 2 is an overall view of an embodiment of a filter plant wherein the water distributors extend across a plurality of filter modules.
- fluid should be construed broadly to incorporate all kinds of fluids in a filter plant, such as the water to be purified, a denitrification gas, such as air, etc.
- Fig. 1 shows an overall view of a filter plant, generally designated 1 .
- the filter plant comprises a plurality of filter modules, generally designated 1 0, conventionally comprising sand as filter material.
- Each filter module is partly defined by a bottom cone made of concrete, for example.
- the plant is provided with a plurality of inlet water distributors 20 and the water to be denitrified is admitted there through.
- Each water distributor 20 has a length adapted to extend across at least two filter modules. In the embodiment shown, there are four parallel water distributors running above each filter module.
- a plurality of process air distributors in the form of elongated hoods 30 having a length adapted to extend across at least two filter modules.
- a device for continuous cleaning is provided for each of the filter modules.
- an air-lift pump 40 adapted to transport contaminated sand from the bottom cone.
- FIG. 2 A sectional view of the plant 1 is shown in Fig. 2.
- Filter material in the form of sand (not shown in this figure) is provided as inverted cones in the respective filter module 1 0.
- the air-lift pumps 40 extend down close to the bottom of the respective filter module for removal of contaminated filter material, preferably sand.
- a filter module is defined as a filter unit having a separate system for the removal of contaminated filter material.
- each water distributor extends across two filter modules 1 0, although it is envisaged that they can extend across more than two filter modules.
- Each water distributor 20 is supported in its middle section by concrete pyramids forming the base of the filter plant 1 and is at the two ends thereof supported by a respective bracket 22.
- each air distributor 30 is supported at the two ends thereof by a respective bracket 22.
- a beam 32 is provided at the centre of the air distributors for supporting a plurality of air distributors, see also Fig . 1 .
- Water is supplied to the water distributors 20 by means of a respective water inlet conduit 24 while air is supplied to the air distributors 30 by means of a respective air inlet conduit 34.
- the air distributors 30 are provided with a plurality of holes 30a, through which air is allowed to escape. All holes are provided at the same level and this provides even distribution of air bubbles rising through the filter material of the module in question. It is preferred that the holes 30a on the two sides of each air distributor are provided mutually displaced so as to achieve even distribution of the air bubbles. [0041 ] The operation of the filter plant 1 will now be explained with reference to Fig. 3. Water is supplied through the water inlet conduit 24 and is evenly
- Fig. 4 is a detailed end view of the water and air distributors showing the water inlet conduits 24 supplying water to the water distributors 20 and the air inlet conduits 34 supplying air to the air distributors 30.
- FIG. 5 is a view showing the shape of the water distributors 20 and the air distributors 30.
- Fig. 6 it is seen that the holes 30a on the different sides of the air distributor are mutually displaced.
- FIG. 7 An alternative embodiment of a filter plant will now be described with reference to Figs. 7 and 8.
- the water distributors 1 20 are of a conventional type in the form of arms extending radially from the water inlet conduits 1 24.
- water rising from the water distributors is aerated by the air bubbles leaving the air distributors 30.
- Each air distributor 1 30 is constituted by a hood 1 32 preferably made of a plastic material, although it is also possible to use stainless steel or the like.
- the hood 1 32 has a ridge and two essentially planar slanting sections 1 32b extending at an angle from the ridge.
- a plurality of notches 1 32c are provided, which are adapted to release air enclosed by the hood 1 32.
- the air distributors are in the form of a perforated hose 230, which is provided above the water distributors, see Figs. 1 0 and 1 1 .
- this kind of air distributor is combined with water distributors 20 extending across two filter modules while in Fig. 1 1 it is combined with water distributors 1 20 of the conventional form of arms extending radially from the water inlet conduits 1 24.
- the hose 230 is preferably made of polyurethane or other suitable plastic material and can thus be arranged in different configurations depending on the layout of the filter plant 1 .
- each air distributor comprises a plurality of essentially straight tube-like sections provided with holes, wherein these sections are interconnected so as to form a circle.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1250518 | 2012-05-23 | ||
PCT/SE2013/050586 WO2013176616A1 (en) | 2012-05-23 | 2013-05-22 | Continuous sand filter plant with fluid distributors |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2852451A1 true EP2852451A1 (en) | 2015-04-01 |
EP2852451A4 EP2852451A4 (en) | 2016-02-24 |
Family
ID=47934738
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13793691.0A Withdrawn EP2852451A4 (en) | 2012-05-23 | 2013-05-22 | Continuous sand filter plant with fluid distributors |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2852451A4 (en) |
CN (2) | CN202822936U (en) |
IN (1) | IN2014MN02597A (en) |
WO (1) | WO2013176616A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103657173A (en) * | 2013-12-12 | 2014-03-26 | 王强 | Upward flow filtering device using homogeneous heavy thick filter material |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011057665A1 (en) * | 2009-11-11 | 2011-05-19 | Nordic Water Products Ab | A method for the treatment of water and wastewater |
JP2011200776A (en) * | 2010-03-25 | 2011-10-13 | Takuma Co Ltd | Sand filter apparatus |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4126546B1 (en) | 1977-02-23 | 1993-05-18 | Axel Johnson Engineering Ab | Method for the filtration of a suspension or emulsion |
US4197201A (en) * | 1976-03-03 | 1980-04-08 | Rederiaktiebolaget Nordstjernan | Apparatus for the filtration of a suspension or emulsion |
SE429128B (en) | 1976-11-29 | 1983-08-15 | Nordstjernan Rederi Ab | PROCEDURE FOR SEPARATING POLLUTANTS IN WATER SUSPENSIONS OR EMULSIONS |
DE7816518U1 (en) * | 1978-06-02 | 1978-09-28 | Passavant Werke | Device for fine filtering of water or waste water |
SE470155B (en) * | 1991-04-16 | 1993-11-22 | Nordic Water Prod Ab | Blowing a gas into a granular filter bed |
US5558763A (en) * | 1993-06-24 | 1996-09-24 | Hitachi Plant Engineering & Construction Co., Ltd. | Sewage treatment system with air jetting means |
TW296654U (en) * | 1996-05-23 | 1997-01-21 | Mao-Sheng Lin | Improved structure for continuous sand filter |
FR2755620B1 (en) * | 1996-11-14 | 1998-12-24 | Jean Voisin Sa | INSTALLATION FOR A SOLID WASTEWATER TREATMENT BY FILTRATION-PERCOLATION ON SAND |
CN2313656Y (en) * | 1997-11-18 | 1999-04-14 | 张富华 | Continuous filter |
DE60226965D1 (en) * | 2001-04-04 | 2008-07-17 | Ngk Insulators Ltd | RAINWATER TREATMENT DEVICE IN MIXED WATER CHANNELS AND RELATED METHOD OF BACKWASHING |
CN201524479U (en) * | 2009-07-03 | 2010-07-14 | 北京沃特林克环境工程有限公司 | Filter system for active sand |
-
2012
- 2012-06-07 CN CN2012202751069U patent/CN202822936U/en not_active Expired - Lifetime
-
2013
- 2013-05-22 CN CN201380039238.9A patent/CN104736215A/en active Pending
- 2013-05-22 WO PCT/SE2013/050586 patent/WO2013176616A1/en active Application Filing
- 2013-05-22 EP EP13793691.0A patent/EP2852451A4/en not_active Withdrawn
-
2014
- 2014-12-23 IN IN2597MUN2014 patent/IN2014MN02597A/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011057665A1 (en) * | 2009-11-11 | 2011-05-19 | Nordic Water Products Ab | A method for the treatment of water and wastewater |
JP2011200776A (en) * | 2010-03-25 | 2011-10-13 | Takuma Co Ltd | Sand filter apparatus |
Non-Patent Citations (1)
Title |
---|
See also references of WO2013176616A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN104736215A (en) | 2015-06-24 |
CN202822936U (en) | 2013-03-27 |
EP2852451A4 (en) | 2016-02-24 |
IN2014MN02597A (en) | 2015-07-24 |
WO2013176616A1 (en) | 2013-11-28 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20141218 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAX | Request for extension of the european patent (deleted) | ||
RA4 | Supplementary search report drawn up and despatched (corrected) |
Effective date: 20160126 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: B01D 24/40 20060101AFI20160120BHEP Ipc: B01D 24/16 20060101ALI20160120BHEP Ipc: B01D 24/30 20060101ALI20160120BHEP Ipc: B01D 24/46 20060101ALI20160120BHEP Ipc: B01D 24/00 20060101ALI20160120BHEP |
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17Q | First examination report despatched |
Effective date: 20180124 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20190918 |