WO1995013124A1 - Filtre a sable dynamique - Google Patents

Filtre a sable dynamique Download PDF

Info

Publication number
WO1995013124A1
WO1995013124A1 PCT/SE1994/001060 SE9401060W WO9513124A1 WO 1995013124 A1 WO1995013124 A1 WO 1995013124A1 SE 9401060 W SE9401060 W SE 9401060W WO 9513124 A1 WO9513124 A1 WO 9513124A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
filter material
washer
outlet
flow
Prior art date
Application number
PCT/SE1994/001060
Other languages
English (en)
Inventor
Sven HÅKANSON
Original Assignee
Haakanson Sven
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Haakanson Sven filed Critical Haakanson Sven
Priority to AU10383/95A priority Critical patent/AU1038395A/en
Publication of WO1995013124A1 publication Critical patent/WO1995013124A1/fr

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
    • B01D24/28—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
    • B01D24/38—Feed or discharge devices
    • 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
    • B01D24/4631—Counter-current flushing, e.g. by air
    • 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

  • DYNAMIC SAND FILTER This invention relates to method and apparatus for reducing reject water flow and energy consumption in filtration in dynamic filters.
  • the sand In a dynamic filter, the sand is transported from the bottom of the bed up to the sand washer by means of compressed air in a so-called air lift pump, or by a water jet in an elector pump In both cases, considerable amounts of water follows the sand up to the washer and this water is mixed with the water from tne sand washer and flows out as reject water
  • This invention relates to method and apparatus for preventing the water from the washer and the sand pump from being mixed, this makes it possible to reduce the reject water flow as well as to reduce the power consumption
  • the Austrian patent description A 128/72 depicts a filter where the sand is transported from the bottom of the bed, by a water driven ejector pump, to a hydrocyclone. placed above the bed. where sand and water with impurities are separated
  • the lower outlet of the hydrocyclone is connected to a container which has a bottom outlet for the sand Pure water is fed into the container in order to prevent the reject water from flowing down into the filtrated water
  • a part of the supplied water follows the sand down into the filter and a part follows the water from the hydrocyclone to the retention vessel
  • the vessel is equipped with an overflow pipe for reject water Tne water in the vessel is used for the ejector pump It seems that the method of using a hydrocyclone for cleaning the sand does not give sufficiently clean sand for exacting applications Tne filter na ⁇ not gain any commercial significance
  • the filter according to the Swedish patent 7602999 has because of simple design and good performances become very popular
  • the sand is transported from the Dottom of tne bed by a compressed air driven pump placed in the center uo to a counter- current washer placed aoove the oed Filtrated water flows up tnrough the washer and meets there the sand that falls down Tne dirty water flows out over an overflow weir
  • the water that follows the sand through the sand pump is mixed with the wash water and flows out over the same overflow weir This means that the water flow through the washer is affected considerably if the sand flow changes
  • the sand flow is increased, the amount o * water that follows the sand increases As a result the level in the top of the washer rises and thereby the water flow through the washer is decreased This is contrary to what is desireable, an increased sand flow requires an increased wash water flow
  • the capacity of a compressed air driven sand pump is highly dependent on the pressure difference between
  • the present invention provides a method and an apparatus for keeping the water flow from the washer and the waterflow from the sand pump separate and thereby making possible a lower reject water flow and a lower power consumption
  • Fig 1 shows a filter according to heretofore known technique with the washer modified according to the invention
  • Fig 2 shows a filter with water jet driven sand pump and separator for impurities
  • Fig 3 shows a variant of Fig 2
  • Fig 4 shows a filter with the washer placed outside the filter tank
  • Fig 5 shows a detail of the invention
  • the filter according to Fig 1 functions in the following way
  • the water to be filtered is fed through the pipe 1 , distributed round the bed by the circular channel 2 moves up vertically through the bed 3 and flows out over the overflow weir 4
  • a sand pump 5 In the lowest part of the sand bed a sand pump 5 is connected which may be driven by air that is supplied through pipe 6 or by water that is supplied through pipe 22 or by a combination of air and water
  • the sand is transported up to a vessel 8, placed above the washer 7, with outlet 4 and overflow weir 9 Filtrated water is pushed up through the washer by the level difference between the overflow weirs 4 and 9
  • a container 10 with an overflow weir 11 and with an outlet pipe 12 is placed in the center, above the center part 13 of the washer
  • the container is equipped with a conical bottom and an outlet hole or holes for the sand
  • the container may be placed immediately above the center part 13 in such a manner that a slot 14 is formed
  • the slot is so adjusted that the flow of sand fills the greater part of the slot
  • the slot may be made adjustable for example by making the container 10 or the top of the center part 13 adjustable vertically
  • the slot can be made automatically adjustable if the top of the center part is made moveable and equipped with a spring or a float that keeps it against the bottom of the container 10 the slot will then be adjusted automatically according to the sand flow
  • the container 10 may be placed quite above the center part 13 and equipped with a manually or automatically regulated throttle see Fig 5
  • the outlet pipes 12 and 27 may be equipped with regulating valves In that case, the levels in vessels 8 and 10 must be set to be equal by adjusting the valves manually or automatically
  • the invention makes it possible to introduce a control system that automatically adapts the wash water flow to the filter load This can be accomplished for example, by measuring the flow into the filter and control the wash water flow in proportion to the inflow
  • the pressure loss through the bed is affected by the inflow and tne degree of contamination of the bed Therefore the pressure loss may be used for control of tne wash water flow
  • An increase of tne pressure loss means that the inflow nas increased or the amount of impurities in the bed has increase ⁇ In that case the wash water flow must be increased too to avoid that the filtration may become worse
  • the feature of the sand pump that, besides sand, water too is transported leads to its functioning as a pre-washer for the sand
  • the pump water can contain a large amount of impurities Depending on the operational conditions, the pump water or wash water may be more contaminated If the more contaminated water flow is discharged as reject water and the other flow is returned to the inlet of the filter, the reject flow is reduced conciderably
  • the filters which have gained the most use so far have a sand pump that is driven by compressed air It has been shown that the energy cost for the compressed air is considerable, the installation cost for the compressor equippment is high and the service cost may become very high
  • Fig 2 shows a filter equipped with a water jet pump
  • a water pump 15 takes water from the inlet side of the filter and pushes it through a nozzle 22 in the lowest part of the bed
  • the water jet from the nozzle pushes up the sand through the pipe 5
  • the sand falls down through the washer and the pump water out over the overflow weir 11 through the pipe 12, and, if the water is very dirty, through a separator 16 where concentrated impurities are taken out through the outlet p ⁇ pe17
  • the water goes from the separator to a tank 18 with an overflow pipe 19
  • the water from the washer goes directly to the tank 18 or if the water is very dirty via separator 16
  • the water is pumped from tank 18 to the inlet of the filter
  • the flow is controlled by the valve 20 so that a suitable reject water fiow flows out of pipes 19 and 20
  • Fig 3 shows a filter similar to Fig 1 but with the difference that the water from the tank 18 goes directly to pump 15
  • the reject water flow from pipes 17 and 19 are controlled here by the level of the overflow wei
  • nozzle 22 In order to prevent the nozzle 22 to be clogged with impurities or sand, it may be made of an elastic material, rubber, polyurethane or similar If something gets stuck in the nozzle the water pressure rises, the nozzle expands and releases what has got stuck The reduction 23 in the inlet of the pump pipe and the conical outlet 24 increase the efficiency of the pump and lower the power consumption
  • Fig 4 shows that a washer according to the invention may be placed by the side of the fiter tank when a low filter is needed This filter may also be equipped according to Fig 2 and 3
  • Fig 5 shows an embodiment of the pump water container 10
  • the container is here equipped with an overflow weir around the full circumference
  • the flow area of the outlet hole is controlled by a control body 26
  • the control can be accomplished automatically if an upward force is applied against the control body
  • the force is so adjusted that the sand flows evenly around the periphery of the control body
  • the force may be generated by a spring 23 or a float
  • the control body may be shaped as a float

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)

Abstract

Cette invention concerne un procédé et un appareil permettant de réduire l'écoulement d'eau qui est rejeté par le filtre à lit mobile et de laver ledit sable dans un laveur de sable. Les écoulements d'eau de lavage et de la pompe sont maintenus séparés et par conséquent n'importe lequel de ces écoulements, ou des fractions de ces derniers, peuvent être ramenés au côté d'entrée du filtre.
PCT/SE1994/001060 1993-11-12 1994-11-11 Filtre a sable dynamique WO1995013124A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU10383/95A AU1038395A (en) 1993-11-12 1994-11-11 Dynamic sand filter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9303735-6 1993-11-12
SE9303735A SE501901C2 (sv) 1993-11-12 1993-11-12 Förfarande och anordning för att minska rejektflöde och energiförbrukning vid filtrering i dynamiska filter

Publications (1)

Publication Number Publication Date
WO1995013124A1 true WO1995013124A1 (fr) 1995-05-18

Family

ID=20391724

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1994/001060 WO1995013124A1 (fr) 1993-11-12 1994-11-11 Filtre a sable dynamique

Country Status (6)

Country Link
JP (1) JP2754452B2 (fr)
KR (1) KR0169762B1 (fr)
AU (1) AU1038395A (fr)
SE (1) SE501901C2 (fr)
TW (1) TW234696B (fr)
WO (1) WO1995013124A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19735672A1 (de) * 1997-08-18 1999-03-04 Maier & Partner Abwassertechni Verfahren und Vorrichtung zum Regenerieren eines Filtermaterials
WO2001030474A1 (fr) * 1999-10-27 2001-05-03 Koyo Engineering Co., Ltd. Appareil de filtrage avec lit de sable filtrant
DE10047530A1 (de) * 2000-09-22 2002-04-11 Egner Umwelttech Gmbh Filtrationsvorrichtung und Verfahren zum Betreiben einer Filtrationsvorrichtung
KR20020085698A (ko) * 2001-05-09 2002-11-16 주식회사 타 셋 여과사를 이용한 원수 여과장치

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI419846B (zh) * 2010-10-25 2013-12-21 Han Pin Lee 移動床式高級氧化循環處理方法及其系統
JP5763503B2 (ja) * 2011-11-07 2015-08-12 三機工業株式会社 移動床式上向流連続砂濾過装置及びその運転方法
CN105668834B (zh) * 2016-03-30 2018-05-08 湖北君集水处理有限公司 一种多管束旋流沉淀分离装置
CN109092554B (zh) * 2018-06-12 2020-06-19 张日养 交叉流式砂泥洗涤分离的方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4197201A (en) * 1976-03-03 1980-04-08 Rederiaktiebolaget Nordstjernan Apparatus for the filtration of a suspension or emulsion
WO1981002393A1 (fr) * 1980-02-26 1981-09-03 B Moeller Appareil de filtration de liquides
WO1991008818A1 (fr) * 1989-12-08 1991-06-27 Haakanson Sven Anders Samuel Appareil de filtration de liquides
WO1994001194A1 (fr) * 1992-07-14 1994-01-20 Andritz Sprout-Bauer, Inc. Filtre a lit profond a gravier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4197201A (en) * 1976-03-03 1980-04-08 Rederiaktiebolaget Nordstjernan Apparatus for the filtration of a suspension or emulsion
WO1981002393A1 (fr) * 1980-02-26 1981-09-03 B Moeller Appareil de filtration de liquides
WO1991008818A1 (fr) * 1989-12-08 1991-06-27 Haakanson Sven Anders Samuel Appareil de filtration de liquides
WO1994001194A1 (fr) * 1992-07-14 1994-01-20 Andritz Sprout-Bauer, Inc. Filtre a lit profond a gravier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19735672A1 (de) * 1997-08-18 1999-03-04 Maier & Partner Abwassertechni Verfahren und Vorrichtung zum Regenerieren eines Filtermaterials
WO2001030474A1 (fr) * 1999-10-27 2001-05-03 Koyo Engineering Co., Ltd. Appareil de filtrage avec lit de sable filtrant
US6471857B1 (en) 1999-10-27 2002-10-29 Koyo Engineering Co., Ltd. Filter apparatus with sand filter bed
DE10047530A1 (de) * 2000-09-22 2002-04-11 Egner Umwelttech Gmbh Filtrationsvorrichtung und Verfahren zum Betreiben einer Filtrationsvorrichtung
KR20020085698A (ko) * 2001-05-09 2002-11-16 주식회사 타 셋 여과사를 이용한 원수 여과장치

Also Published As

Publication number Publication date
AU1038395A (en) 1995-05-29
KR0169762B1 (ko) 1999-01-15
SE9303735L (sv) 1995-06-13
JPH07204421A (ja) 1995-08-08
SE501901C2 (sv) 1995-06-19
KR950013554A (ko) 1995-06-15
TW234696B (en) 1994-11-21
JP2754452B2 (ja) 1998-05-20
SE9303735D0 (sv) 1993-11-12

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