WO1989001814A1 - Filtration plant - Google Patents

Filtration plant Download PDF

Info

Publication number
WO1989001814A1
WO1989001814A1 PCT/FI1988/000136 FI8800136W WO8901814A1 WO 1989001814 A1 WO1989001814 A1 WO 1989001814A1 FI 8800136 W FI8800136 W FI 8800136W WO 8901814 A1 WO8901814 A1 WO 8901814A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
water
basin
filtration plant
devices
Prior art date
Application number
PCT/FI1988/000136
Other languages
French (fr)
Inventor
Esko MÄLKKI
Kalevi Hautakangas
Original Assignee
Maelkki Esko
Kalevi Hautakangas
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 Maelkki Esko, Kalevi Hautakangas filed Critical Maelkki Esko
Publication of WO1989001814A1 publication Critical patent/WO1989001814A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/02—Combinations of filters of different kinds
    • 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
    • B01D24/20—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 provided in an open container
    • B01D24/24—Downward 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
    • B01D24/38—Feed or discharge devices
    • B01D24/42—Feed or discharge devices for discharging filtrate
    • 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
    • B01D29/117—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 arranged for outward flow filtration
    • 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
    • B01D29/52—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 parallel connection

Definitions

  • the object of the invention is a filtration plant for water, to which filtration plant belong a filter basin and a filtering material layer, favourably a layer of sand, through which the water to be purified is arranged 5 to be led.
  • part of the precipi ⁇ tation takes place on the surface and/or in the surface layer of the sand filter.
  • the impurities accumulated into the.-E ⁇ lters deteriorate the functioning of the plant and
  • the cleaning of the filters can be performed by technical methods, but they are expensive especially with filters of large areas. For this reason the accumulated impurities 25 are removed by peeling the surface part of the sand layer away. This again for its part is causing difficulties especially under winter conditions.
  • the purpose of the invention is to bring about a filtration 30 plant, which eliminates disadvantages connected with the present filtration plants.
  • Especially the aim of the inven ⁇ tion is to bring forth a filtration plant, where the im ⁇ purities are removed to their biggest part before the water is led to the actual filtering material layer.
  • 35 the purpose of the invention is to bring about a filtration plant, which is dependable in operation, easy to construct and to maintain.
  • the filter basin placed filter devices, through which the running water is arranged to flow before the water HG ⁇ - is being led to the filtering material layer.
  • a part of the capacity of the sand filter is compensated with the in the basin positioned separate filter devices, whereat in a small space a large filtering area is being formed.
  • the filter devices belong favourably a supporting framework and the on the supporting framework fastened filter material.
  • filter material is ⁇ used a filter cloth, a filter paper, a permeable mineral sheet, an activated carbon package, a mineral earth package
  • the water permeable walls of the filter devices filtrate mechanically the already formed deposit. At the same time on the surfaces of the walls ferric and manganic bacterial action is formed lead ⁇ ing for the part of the not yet precipitated material to
  • This process can favour ⁇ ably be activated by treating the wall material with bac ⁇ terial action promoting/initiating nutrients, catalytic process promoting substances, bacterial action favouring underlaying colonies as well as with direct bacterial
  • the number of the filter devices is selected in accordance with the prevailing circumstances in such a way, that the hydraulic surface load is suitable. For instance in one to its dimensions 100x100x100 cm being, with a sand filter equipped basin for instance 10 pcs to
  • figure 1 presents the filtration plant in accordance with the invention seen from the above
  • figure 2 presents the filtration plant in accordance with the figure 1 in cross-section along the line A-A
  • figure 3 presents the filtration plant in accordance with the figure 1 in cross-section along the line B-B
  • figure 4 presents an other application of the filtration EO plant in accordance with the invention seen from the above
  • figure 5 presents the filtration plant in accordance with the figure 4 in cross-section along the line C-C.
  • the filter basin is in this application to its form a right ⁇ -angled parallelogram and the filter devices are lengthy and reach in the lateral direction of the basin from close to the one side of the basin to close to the
  • the filter devices are arranged to reach from above the water surface level to relatively close to the surface of the sand layer.
  • the filter devices 30 have been connected with each other with the help of the fastening bars 8.
  • the fastening bars are fastened close to the ends of the filter devices and they fix the filter devices to each other at regular distances from each other.
  • the ends of the fastening bars have been arranged to reach 35 outside the edges of the basin, so the filter devices hang in the basin supported by the fastening bars.
  • To the filtration plant belongs the in the figures 1 and 2 presented inlet tube system 4 for the water to be purified, which is arranged to reach over the basin to the spot of fcfre farthermost filter device. ' On the inlet tube system troles or nozzles have been arranged on the spots of the filter devices.
  • the collect ⁇ ing pipe 9 placed inside the sand filter, which is equipped with a drainage valve 10 and with the the water level of the basin simultaneously controlling discharge pipe 11.
  • FIG 3 has been presented a cleaning device intended for the scavenging of the filter devices.
  • To the cleaning device belong a longitudinal support tube 12 and on the support tube downright fastened, with holes equipped flush ⁇ ing pipes 13.
  • the flushing pipes are positioned at a distance from each other in such a way, that every second flushing pipe is in the filter - device and every other second flushing pipe is between the filter devices.
  • the outermost flushing pipes are between the filter device and the edge of the basin.
  • the filter devices are cleaned by directing on the walls of the filter devices a cleaning water flush from the holes made on the flushing pipes.
  • the filter devices placed in the filter basin support themselves against the underlying framework 14 positioned on the bottom of the basin, under which a space for sedimentation is remaining.
  • the filter devices are con ⁇
  • This unit is cleaned by lifting it away from the sand fil ⁇ ter and by flushing water in the opposite direction to the operational position.
  • the invention is not limited to the presented favourable application examples, but it can vary withia' the frames of the patent claims.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

The object of the invention is a filtration plant for processing of water, to which filtration plant belong a filter basin (1) and a filtering material layer (2), favourably a sand layer, through which the water to be purified is arranged to be led. The sand filters are blocked by the impurities accumulated into them and the cleaning of them is troublesome. To the filtration plant in accordance with the invention belong several, into the filter basin placed filter devices (3), through which the water to be purified is arranged to flow prior to the filtering material layer.

Description

FILTRATION PLANT
The object of the invention is a filtration plant for water, to which filtration plant belong a filter basin and a filtering material layer, favourably a layer of sand, through which the water to be purified is arranged 5 to be led.
To the processing of the water belongs always a filter¬ ing phase, in which the raw or with some method prepro- cessed water is led through the filtering material layer. j(j As the filtering material is usually always a layer of sand. Generally in the processing of the water different as well chemical as biological precipitation processes are applied prior to leading of the water through the fil¬ tering material. Hereat the solid material still contain-
1~ ed in the water remains in the filtering material layer.
Especially in the biological processes part of the precipi¬ tation takes place on the surface and/or in the surface layer of the sand filter. The impurities accumulated into the.-Eϊlters deteriorate the functioning of the plant and
20 tend to block the filter.
The cleaning of the filters can be performed by technical methods, but they are expensive especially with filters of large areas. For this reason the accumulated impurities 25 are removed by peeling the surface part of the sand layer away. This again for its part is causing difficulties especially under winter conditions.
The purpose of the invention is to bring about a filtration 30 plant, which eliminates disadvantages connected with the present filtration plants. Especially the aim of the inven¬ tion is to bring forth a filtration plant, where the im¬ purities are removed to their biggest part before the water is led to the actual filtering material layer. Additionally, 35 the purpose of the invention is to bring about a filtration plant, which is dependable in operation, easy to construct and to maintain.
The purpose of the invention is reached with such a filtra¬ tion plant, which is mainly characterized by that, what 5 has been presented in the patent claims.
According to the invention to the filtration plant belong several, in the filter basin placed filter devices, through which the running water is arranged to flow before the water HGΪ- is being led to the filtering material layer. Hereat a part of the capacity of the sand filter is compensated with the in the basin positioned separate filter devices, whereat in a small space a large filtering area is being formed.
15 According to the invention to the filter devices belong favourably a supporting framework and the on the supporting framework fastened filter material. As filter material is Ϊ used a filter cloth, a filter paper, a permeable mineral sheet, an activated carbon package, a mineral earth package
20 or some other suitable material. The water permeable walls of the filter devices filtrate mechanically the already formed deposit. At the same time on the surfaces of the walls ferric and manganic bacterial action is formed lead¬ ing for the part of the not yet precipitated material to
25 a biological purification process. This process can favour¬ ably be activated by treating the wall material with bac¬ terial action promoting/initiating nutrients, catalytic process promoting substances, bacterial action favouring underlaying colonies as well as with direct bacterial
SO plantations on the walls. The number of the filter devices is selected in accordance with the prevailing circumstances in such a way, that the hydraulic surface load is suitable. For instance in one to its dimensions 100x100x100 cm being, with a sand filter equipped basin for instance 10 pcs to
35 their area about 1 sq.m being filter devices can be placed, whereat as the filtration area the tenfold compared with the sand filter is obtained. In the following the invention is explained more in detail by referring to the attached drawing, in which figure 1 presents the filtration plant in accordance with the invention seen from the above, 5 figure 2 presents the filtration plant in accordance with the figure 1 in cross-section along the line A-A, figure 3 presents the filtration plant in accordance with the figure 1 in cross-section along the line B-B, figure 4 presents an other application of the filtration EO plant in accordance with the invention seen from the above, and figure 5 presents the filtration plant in accordance with the figure 4 in cross-section along the line C-C.
15 In the application presented in the figures 1-3 to the fil¬ tration plant belong the filter basin 1, on the bottom of the filter basin placed filtering sand layer 2 and several in the filter basin positioned filter devices 3. The fil¬ ter devices in this application are formed from supporting
20 frameworks and from on the supporting frameworks fastened filter cloths. The filter basin is in this application to its form a rightτ-angled parallelogram and the filter devices are lengthy and reach in the lateral direction of the basin from close to the one side of the basin to close to the
25 other side. In the height direction of the basin the filter devices are arranged to reach from above the water surface level to relatively close to the surface of the sand layer.
As it has been presented on figure 1 the filter devices 30 have been connected with each other with the help of the fastening bars 8. The fastening bars are fastened close to the ends of the filter devices and they fix the filter devices to each other at regular distances from each other. The ends of the fastening bars have been arranged to reach 35 outside the edges of the basin, so the filter devices hang in the basin supported by the fastening bars. To the filtration plant belongs the in the figures 1 and 2 presented inlet tube system 4 for the water to be purified, which is arranged to reach over the basin to the spot of fcfre farthermost filter device.' On the inlet tube system troles or nozzles have been arranged on the spots of the filter devices. Further to the plant belongs the collect¬ ing pipe 9 placed inside the sand filter, which is equipped with a drainage valve 10 and with the the water level of the basin simultaneously controlling discharge pipe 11.
On. figure 2 the flowing and the leading of the water in trite- plant has been presented. From the water inlet tube system 4 the water is fed into the filter devices 3. Through the walls of the filter devices the water is flowing in ac- cordance with the arrows to the rest of the filter basin.
From the filter basin the water is leaving through the sand filter 2 and the inside of it placed collecting pipe to the discharge pipe and away from the basin.
In figure 3 has been presented a cleaning device intended for the scavenging of the filter devices. To the cleaning device belong a longitudinal support tube 12 and on the support tube downright fastened, with holes equipped flush¬ ing pipes 13. In accordance with the figure the flushing pipes are positioned at a distance from each other in such a way, that every second flushing pipe is in the filter - device and every other second flushing pipe is between the filter devices. The outermost flushing pipes are between the filter device and the edge of the basin. The filter devices are cleaned by directing on the walls of the filter devices a cleaning water flush from the holes made on the flushing pipes. In the way presented on the figure 3 the flowing coming from the outside of the filter devices is directed in right angle on the surface of the filter device wall, whereat the flow coming from the flushing pipe posi¬ tioned on its inside is directed obliquely downwards. Here¬ with a suitable combined effect is obtained for the loosen¬ ing of the impurities adhering to the filters and a sedi- mentation of them on the bottom of the device. The impuri¬ ties collected on the bottoms of the devices are easy to remove with the help of a suitable instrument by suction. The cleaning device system is moved in the transverse di- 3 rection of the basin. For the maintenance of the sand fil¬ ter the filter devices connected together with the support¬ ing bars are lifted away out of the basin, whereat also the filter devices can at the same time be emptied from the impurities. m
In the application presented in the figures 4 and 5 in the first filter basin 1 the filter devices 3 have been placed, and in the second filter basin 5 the sand layer 2 has been placed. The structure of the filter devices is correspond¬
15 ing to that presented in the presentation of the earlier application. The filter devices placed in the filter basin support themselves against the underlying framework 14 positioned on the bottom of the basin, under which a space for sedimentation is remaining. The filter devices are con¬
20 nected with each other with the collecting pipe 7, which is led further to the second filter basin above the sand layer. On top of the sand layer is in this application placed in a horizontal position the filter device 15.
25 In this, application the water to be processed is led through the inlet tube system 6 into the free water space of the filter basin, from where it flows into the filter devices through their walls. The filter devices are cleaned in a corresponding manner to that in the above presented applica-
20 tion. From the filter devices the water is flowing through the collecting pipe positioned in their upper part to the sand filter. The uppermost filter surface on it is on the limiting border between the air and the water, where the prerequisitions for the bacterial action are good. The lower,
3.5 on the surface, being filter cloth activates the effect.
This unit is cleaned by lifting it away from the sand fil¬ ter and by flushing water in the opposite direction to the operational position. The invention is not limited to the presented favourable application examples, but it can vary withia' the frames of the patent claims.

Claims

PATENT CLAIMS
I. A filtration plant for processing of the water, into which filtration plant belong a filter basin (1) and a fil¬ tering material layer (2), favourably a sand layer, through which the water to be purified is arranged to be led, 5 c h a r a c t e r i z e d in, that to the filtration plant belong several in the filter basin positioned filter devices (3), through which the water to be purified is arranged to be flown before the filtering material layer.
10 2. The filtration plant in accordance with the patent claim 1, c h a r a c t e r i z e d in, that to the fil¬ ter device belong a supporting framework and an on the sup¬ porting framework fastened filtering material.
15 3. The filtration plant in accordance with the patent claims 1 or 2, c h a r a c t e r i z e d in, that the filter devices are lengthy, from the above of the water surface level near to the filter basin bottom reaching devices.
20
4. The filtration plant in accordance with some of the patent claims 1-3, in which on the bottom of the filter basin has been placed a filtering material layer, c h a r a c t e r i z e d in, that to the filtration
25 plant belongs an inlet tube system (4) of the water to be purified, which has been arranged to lead the water to the filter devices and, that from the filter devices the water is arranged to flow through the wall of the filter devices into the rest of the water basin space and through the
30 filtering material layer located on the bottom of the fil¬ ter basin away from the basin.
5. The filtration plant in accordance with some of the patent claims 1-3, c h a r a c t e r i z e d in, that
35 the filtering material layer is placed in a second filter basin (5) and, that to the filtration plant belongs an inlet tube system (6) for the water to be purified, which is arranged to lead the water in the filter basin (1), and from the filter basin the water is arranged to flow into the filter devices through their walls and in the upper part of the filter devices is positioned a discharge pipe (7), through which the water is arranged to flow away from filter basin (1) on top of the filtering material layer.
6. The filtration plant in accordance with some of the patent claims 1-5, c h a r a c t e r i z e d in, that as a part of the filter device is a filter cloth, a filter paper, a permeable mineral sheet, an activated carbon pack¬ age or a mineral earth package.
7. The filtration plant in accordance with some of the patent claims 1-6, c h a r a c t e r i z e d in, that the wall material of the filter devices has been treated with ferric-manganic bacterial action promoting nutrients, cata- lytically influential materials or underlying bacterial colonies.
PCT/FI1988/000136 1987-08-27 1988-08-24 Filtration plant WO1989001814A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI873711A FI873711A (en) 1987-08-27 1987-08-27 FILTRERAPPARATUR.
FI873711 1987-08-27

Publications (1)

Publication Number Publication Date
WO1989001814A1 true WO1989001814A1 (en) 1989-03-09

Family

ID=8524944

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1988/000136 WO1989001814A1 (en) 1987-08-27 1988-08-24 Filtration plant

Country Status (2)

Country Link
FI (1) FI873711A (en)
WO (1) WO1989001814A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995009038A1 (en) * 1993-09-27 1995-04-06 Paroc Oy Ab Method and device for slow filtration of raw water
US5705402A (en) * 1988-11-03 1998-01-06 Igen International, Inc. Method and apparatus for magnetic microparticulate based luminescence assay including plurality of magnets
US5746974A (en) * 1988-11-03 1998-05-05 Igen International, Inc. Apparatus for improved luminescence assays using particle concentration, electrochemical generation of chemiluminescence and chemiluminescence detection
US5770459A (en) * 1986-04-30 1998-06-23 Igen International, Inc. Methods and apparatus for improved luminescence assays using particle concentration, electrochemical generation of chemiluminescence detection
US5779976A (en) * 1988-11-03 1998-07-14 Igen International, Inc. Apparatus for improved luminescence assays
US5798083A (en) * 1988-11-03 1998-08-25 Igen International, Inc. Apparatus for improved luminescence assays using particle concentration and chemiluminescence detection
US5962218A (en) * 1988-11-03 1999-10-05 Igen International Inc. Methods and apparatus for improved luminescence assays
US6078782A (en) * 1988-11-03 2000-06-20 Igen International Inc. Methods for improved particle electrochemiluminescence assays
US6325973B1 (en) 1991-02-06 2001-12-04 Igen International, Inc. Methods and apparatus for improved luminescence assays
US6881589B1 (en) 1987-04-30 2005-04-19 Bioveris Corporation Electrochemiluminescent localizable complexes for assay compositions
ES2335456A1 (en) * 2007-10-16 2010-03-26 Astral Pool Group S.L.U. Installation for the saving of water in the filtration systems in swimming pools (Machine-translation by Google Translate, not legally binding)
CN102030405A (en) * 2010-10-28 2011-04-27 智承开发株式会社 Up-flow bio-filtration processing device using EPE filter material and processing method thereof
US8211279B2 (en) 2005-06-03 2012-07-03 Board Of Regents Of The University Of Texas System Electrochemistry and electrogenerated chemiluminescence with a single faradaic electrode

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382983A (en) * 1964-03-16 1968-05-14 Dixie Entpr Inc Multi-layered filter apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382983A (en) * 1964-03-16 1968-05-14 Dixie Entpr Inc Multi-layered filter apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5770459A (en) * 1986-04-30 1998-06-23 Igen International, Inc. Methods and apparatus for improved luminescence assays using particle concentration, electrochemical generation of chemiluminescence detection
US6881589B1 (en) 1987-04-30 2005-04-19 Bioveris Corporation Electrochemiluminescent localizable complexes for assay compositions
US5746974A (en) * 1988-11-03 1998-05-05 Igen International, Inc. Apparatus for improved luminescence assays using particle concentration, electrochemical generation of chemiluminescence and chemiluminescence detection
US5705402A (en) * 1988-11-03 1998-01-06 Igen International, Inc. Method and apparatus for magnetic microparticulate based luminescence assay including plurality of magnets
US5779976A (en) * 1988-11-03 1998-07-14 Igen International, Inc. Apparatus for improved luminescence assays
US5798083A (en) * 1988-11-03 1998-08-25 Igen International, Inc. Apparatus for improved luminescence assays using particle concentration and chemiluminescence detection
US5962218A (en) * 1988-11-03 1999-10-05 Igen International Inc. Methods and apparatus for improved luminescence assays
US6078782A (en) * 1988-11-03 2000-06-20 Igen International Inc. Methods for improved particle electrochemiluminescence assays
US6325973B1 (en) 1991-02-06 2001-12-04 Igen International, Inc. Methods and apparatus for improved luminescence assays
WO1995009038A1 (en) * 1993-09-27 1995-04-06 Paroc Oy Ab Method and device for slow filtration of raw water
US8211279B2 (en) 2005-06-03 2012-07-03 Board Of Regents Of The University Of Texas System Electrochemistry and electrogenerated chemiluminescence with a single faradaic electrode
US8840774B2 (en) 2005-06-03 2014-09-23 Board Of Regents Of The University Of Texas System Electrochemistry and electrogenerated chemiluminescence with a single faradaic electrode
ES2335456A1 (en) * 2007-10-16 2010-03-26 Astral Pool Group S.L.U. Installation for the saving of water in the filtration systems in swimming pools (Machine-translation by Google Translate, not legally binding)
CN102030405A (en) * 2010-10-28 2011-04-27 智承开发株式会社 Up-flow bio-filtration processing device using EPE filter material and processing method thereof

Also Published As

Publication number Publication date
FI873711A0 (en) 1987-08-27
FI873711A (en) 1989-02-28

Similar Documents

Publication Publication Date Title
WO1989001814A1 (en) Filtration plant
CN110143730B (en) Sewage treatment device capable of treating particulate matters through multistage grading and layering
CN206325269U (en) The continuous sand filtration apparatus of level stream
JPH0655009A (en) Cleanable filter
CN106621493A (en) Horizontal flow continuous sand filtration equipment and water treatment process thereof
US4964987A (en) Cross flow filter apparatus
CN108236800A (en) Continous way hangs dirt filtering device and filtering, back-flushing method
EP0498037A1 (en) Tertiary filtration section for refining waste water
CN2907825Y (en) Self-cleaning sand shifting filter
DK161672B (en) Filter apparatus
CN212387839U (en) Sewage air-float purification device
CN209824668U (en) Liquid bacterial purification system
CN209537160U (en) A kind of multistage medium sanitary sewage filter
CN211340209U (en) Double-layer filtering device for paper machine outer discharge white water
CN2406715Y (en) Filter for continuously recirculating sand-washing
CN216808495U (en) Purification structure of garden design
CN2267851Y (en) Air-purging type micro filter
CN219972112U (en) Ore mud subsides separation collection device
WO2021093219A1 (en) Blue algae concentration device and continuous concentration method
CN214482575U (en) Air mist culture device for mushroom cultivation shed
CN219547908U (en) Gardens ramp rainwater collection device
CN220214091U (en) Filtering and separating device with anti-blocking function
CN217247075U (en) Prevent tombarthite oxide industrial wastewater filter equipment of jam
CN217431052U (en) Pile foundation construction mud treatment facility
CN214654337U (en) Sewage treatment equipment

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): DE DK GB HU NO SE SU US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LU NL SE

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642