EP3793705A1 - Filtre à sable continu - Google Patents

Filtre à sable continu

Info

Publication number
EP3793705A1
EP3793705A1 EP19804517.1A EP19804517A EP3793705A1 EP 3793705 A1 EP3793705 A1 EP 3793705A1 EP 19804517 A EP19804517 A EP 19804517A EP 3793705 A1 EP3793705 A1 EP 3793705A1
Authority
EP
European Patent Office
Prior art keywords
fluid
filter
diffusor
continuous sand
sand filter
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Withdrawn
Application number
EP19804517.1A
Other languages
German (de)
English (en)
Other versions
EP3793705A4 (fr
Inventor
Mattias FELDTHUSEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sulzer Management AG
Original Assignee
Nordic Water Products AB
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 Nordic Water Products AB filed Critical Nordic Water Products AB
Publication of EP3793705A1 publication Critical patent/EP3793705A1/fr
Publication of EP3793705A4 publication Critical patent/EP3793705A4/fr
Withdrawn legal-status Critical Current

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
    • B01D24/46—Regenerating the filtering material in the filter
    • 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
    • B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
    • B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
    • B01D24/16—Upward filtration
    • B01D24/167—Upward filtration the container having distribution or collection headers or pervious conduits
    • 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
    • B01D24/36—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed fluidised during the filtration
    • 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
    • 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
    • C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters

Definitions

  • the present invention relates generally to a continuous sand filter according to claim 1.
  • 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 amount of sand in the filter bed is of importance when for example the nozzle is to be replaced or need maintenance. If any of the nozzles has to be replaced or needs maintenance, the major amount of the filter medium has to be removed, which demands a great effort which is time-consuming and costly.
  • An object of the present invention is to create a continuous sand filter for fluid treatment which is easy to maintain and which provides for good aeration.
  • a continuous sand filter comprising a filter module for holding a filter bed, a fluid inlet and a fluid outlet provided in the filter module. Further, the sand filter comprises a fluid distributor which extend at least partially through the filter bed. Further, the fluid inlet is connected to the fluid distributor.
  • a diffusor is provided between the fluid inlet and the fluid distributor, wherein the diffusor is arranged to create micro or nano bubbles which are distributed into the fluid.
  • the diffusor is at least partially arranged above an upper surface of the filter bed.
  • the diffusor is arranged to create the micro or nano bubbles with diameters within the interval of 10nm - 500pm.
  • the fluid distributor is provided to supply gaseous fluid from the diffusor to a bottom area of the filter bed.
  • the fluid distributor comprises fluid distributor arms arranged in the bottom area of the filter bed. Further the fluid distributor arms are preferably arranged at a maximal distance of approximately 6.5 m from a lower part of the diffusor.
  • the gaseous fluid supplied from the diffusor is air or oxygen gas.
  • the length of the diffusor is less than
  • the continuous sand filter is an up-flow filter.
  • the continuous sand filter comprises a fluid flow capacity between approximately 10-100m 3 /h through the sand of the continuous sand filter.
  • the continuous sand filter comprises a decrease in pressure which is based on a water column with preferably a length in the interval of about 0.5 m to 10 m, measured between a fluid surface of the filter bed and a fluid inlet to the filter bed within the filter module.
  • the diffusor is a carbon ceramic diffusor.
  • a method for processing fluid using the continuous sand filter comprising the steps: -supplying fluid into the fluid inlet,
  • FIG. 1 shows a continuous sand filter according to the invention. Description of embodiments
  • fluid should be construed broadly to incorporate all kinds of fluids in a continuous sand filter, such as wastewater which is to be purified or drinking water produced from surface water.
  • the continuous sand filter is a device for continuous cleaning of a filter bed material. This in turn means a liquid treatment process for liquid purification of e.g. sewerage. Further, the continuous sand filter is an up-flow filter, which means that suspended solids within the fluid are filtered out as the fluid flows up through the continuous sand filter.
  • the continuous sand filter comprises a filter module 1 which is provided with a filter bed 2 comprising sand, a fluid inlet 3 and a fluid outlet (not shown).
  • the fluid inlet 3 is in fluid connection to a fluid distributor 4 which extend at least partially through the filter bed 2. Further, a diffusor 5 is provided between the fluid inlet 3 and the fluid distributor 4. The diffusor 5 is at least partially arranged above an upper surface 6 of the filter bed 2, so that it is easily accessible. The position of the diffusor 5 facilitates maintenance or replacement in case of malfunction.
  • the diffusor 5 is arranged to create bubbles which is distributed into the fluid by means of the fluid distributor 4.
  • the bubbles are preferably micro or nano bubbles.
  • the size of the bubbles is of importance since if the sizes are too large the bubbles tend to merge with one another too quickly and the oxygen feed into the filter bed will not be sufficient. If the size of the bubbles is too small organic nitrogen may dissolve into the fluid which is not desirable, since gives rise to nitrogen fixation.
  • the diffusor 5 is arranged to create micro or nano bubbles into the fluid with diameters preferably within the interval of 10nm - 500pm.
  • the diffusor 5 may be a diffusor using carbon ceramic technology.
  • the carbon ceramic diffusor is provided with a compressor which is arranged to deliver gas under pressure, which gas is arranged to deliver micro or nano bubbles into the liquid.
  • the carbon ceramic diffusor comprises a bubble generation medium which is porous and having several pores.
  • the bubble generation medium may be a compound of a carbon-based material which is porous.
  • the gas delivered under pressure by the compressor passes through the pores of the bubble generation medium and further into liquid of the continuous sand filter as micro or nano bubbles.
  • the micro or nano bubbles are created by the carbon ceramic diffusor when the gas from the compressor is squeezed through the pores of the bubble generation medium.
  • the fluid distributor 4 is provided to supply gaseous fluid from the diffusor 5 to a bottom area 7 of the filter bed 2.
  • the diffuser 5 produces very small bubbles which are introduced through the fluid distributor 4 to the bottom area 7 of the filter bed 2.
  • the small bubbles rise slowly through the filter bed 2 from the bottom of the filter module 1 to a liquid layer 11 above the filter bed 2 and provide efficient transfer of oxygen to the fluid.
  • the oxygen combined with the food source, sewage, allows the bacteria to produce enzymes which help break down the waste so that it can settle in the filter.
  • the fluid distributor 4 comprises fluid distributor arms 8 arranged in the bottom area 7 of the filter bed 2. A stream of bubbles ascend up from the fluid distributor arms 8 to the liquid layer 1 1 above the filter bed 2.
  • a filter medium distributor pipe 10 for conveying polluted filter medium, in this case sand, extends through the central portions of the filter bed 2, from its lowest level to a washing apparatus 12. Air is used for transporting the sand to the washing apparatus 12, whereby the air is taken down centrally in an air distributor pipe 9 disposed concentrically around the filter medium pipe 10. The washed sand is returned to the top of the filter bed 2 and moves downwards in the filter bed 2 as the sand at the bottom is taken away for washing.
  • the fluid distributor 4 is arranged concentrically around the air distributor pipe 9.
  • the fluid, preferably wastewater, that is to be treated in the filter bed 2 is taken via the fluid distributor 4 down into the bottom portion of the filter bed 2, e.g.
  • the treated liquid is taken out (not shown) somewhere above the filter bed 2.
  • the wastewater is oxygenated during this counterflow process between water and sand. Oxygenation suitably takes place using air that is introduced into the filter bed 2 by means of the fluid distributor arms 8.
  • the distributor arms 8 are preferably provided with apertures, through which the gaseous liquid is allowed to escape into the filter bed material.
  • the fluid distributor arms 8 are arranged at a maximal distance A of approximately 6.5 m from a lower part of the diffusor.
  • the maximal distance A is determined by constructional design of the filter module and the limited space available within the filter module 1.
  • the gas supplied to the gaseous fluid by means of the diffusor 5 is air or oxygen gas.
  • the diffusor 5 relates to an oxygenation device in the shape of a tube.
  • the diffusor 5 is used to transfer oxygenated air or oxygen gas into the filter module 1.
  • Oxygen is required by microorganisms/bacteria in the fluid or on the grains in the filter bed 2 to break down pollutants such as inorganic substances. Diffusers in this context produce fine bubbles which are used to oxygenate the inlet fluid for treatment.
  • the length B of the diffusor 5 is less than approximately 1.5 m. The length B is determined by constructional design of the filter module and the limited space available within the filter module 1.
  • blower e.g. an air lift pump which is adapted to transport contaminated filter material from the bottom area 7 of the filter module 1 , preferably a bottom cone 14 of the filter module 1.
  • the air-lift pump extends down close to the bottom of the filter module 1 for removal of contaminated filter material.
  • the filter module 1 is defined as a filter unit having a system for the removal of contaminated filter material.
  • the filter employs a backwash rinse that is performed continually while the tank is
  • the air lift pump located a in a center region of the bottom area of the filter bed draws the liquid from a bottom area 7 of the filter bed 2 up to a washing apparatus 12, e.g. a wash box. As the liquid is released into the washing apparatus 12, it falls into a sand washer where the filtered solids are separated from the sand.
  • the filtered liquid i.e. filtrate carries the solids out as waste so called“backwash”.
  • the washed sand falls down onto the filter bed 2 for continued use.
  • the fluid flow capacity is between approximately 10-100m 3 /h through each filter module of the continuous sand filter.
  • the continuous sand filter may be built up by one or multiple filter modules.
  • a decrease in pressure is based on a water column with preferably a length in the interval of about 0.5 m to 10 m.
  • the water column is measured between the fluid surface of the filter bed 2 and the fluid inlet 3 to the filter bed 2 within the filter module 1.
  • air or oxygen gas is supplied by means of the diffusor 5 through the fluid distributor 4 and out through the distributor arms 8 into the filter bed 2.
  • Fluid contained in the filter material will be oxygenated by means of the distributor arms 8 by means of the aerated air or oxygen gas therefrom.
  • undesirable substances are removed from the fluid, which substances are filtered out as the liquid flows up through the filter bed 2.
  • As the fluid reaches an upper region of the filter module 1 it passes out through the fluid outlet and is
  • the sand filter has been described up to now as continuously operating. This does not mean that each operational phase is continuous.
  • the upward conveyance of polluted filtering medium in this case sand

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

Un filtre à sable continu pour traitement de fluide comprend un module filtrant (1) pour maintenir un lit filtrant (2), une entrée de fluide (3) et une sortie de fluide disposée dans le module filtrant (1). En outre, le filtre à sable continu comprend un distributeur de fluide (4) qui s'étend au moins partiellement à travers le lit filtrant (2) et l'entrée de fluide (3) est reliée au distributeur de fluide (4). Un diffuseur (5) pour créer des micro ou des nano-bulles est disposé entre l'entrée de fluide (3) et le distributeur de fluide (4).
EP19804517.1A 2018-05-18 2019-05-16 Filtre à sable continu Withdrawn EP3793705A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1850587 2018-05-18
PCT/SE2019/050442 WO2019221663A1 (fr) 2018-05-18 2019-05-16 Filtre à sable continu

Publications (2)

Publication Number Publication Date
EP3793705A1 true EP3793705A1 (fr) 2021-03-24
EP3793705A4 EP3793705A4 (fr) 2022-03-02

Family

ID=68540666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19804517.1A Withdrawn EP3793705A4 (fr) 2018-05-18 2019-05-16 Filtre à sable continu

Country Status (2)

Country Link
EP (1) EP3793705A4 (fr)
WO (1) WO2019221663A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100501522B1 (ko) * 2004-08-18 2005-07-18 주식회사 이티에프 상향류식 모래 여과기
NL2001166C2 (nl) * 2008-01-08 2009-07-13 Pacques Bv Inrichting voor het reinigen van een vloeistof middels een filterbed alsmede werkwijze voor het bepalen van de mate van beweging van het filterbed.
US7713426B2 (en) * 2008-01-11 2010-05-11 Blue Water Technologies, Inc. Water treatment
WO2011084172A1 (fr) * 2010-01-08 2011-07-14 Parkson Corporation Appareil pour le traitement d'un liquide contenant des impuretés
KR20100102567A (ko) * 2010-08-27 2010-09-24 대웅이엔에스 (주) 여과병용 다기능 소결소재 미세기포 발생기에 의한 고도 수처리 방법
WO2013036055A1 (fr) * 2011-09-07 2013-03-14 Woongjincoway Co., Ltd Filtre à sable à circulation continue et procédé de filtration à sable à circulation continue
KR101335096B1 (ko) * 2011-09-21 2013-12-03 에이티이 주식회사 상향류식 연속 여과기를 구비한 질소·인 제거 및 재이용수 처리 시스템
CN105060488A (zh) * 2015-09-09 2015-11-18 桂林理工大学 一种利用充氧过滤系统进行污水深度处理的方法
CN106861257A (zh) * 2015-12-14 2017-06-20 哈尔滨顺芝科技有限公司 连续生流式活性砂过滤处理装置及过滤方法
CN107434299B (zh) * 2017-06-01 2023-07-07 厦门百仕洁环保科技有限公司 一种同步硝化反硝化滤池

Also Published As

Publication number Publication date
WO2019221663A1 (fr) 2019-11-21
EP3793705A4 (fr) 2022-03-02

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