US20150076085A1 - Sludge screw thickener with screen rotation during cleaning - Google Patents
Sludge screw thickener with screen rotation during cleaning Download PDFInfo
- Publication number
- US20150076085A1 US20150076085A1 US14/395,599 US201314395599A US2015076085A1 US 20150076085 A1 US20150076085 A1 US 20150076085A1 US 201314395599 A US201314395599 A US 201314395599A US 2015076085 A1 US2015076085 A1 US 2015076085A1
- Authority
- US
- United States
- Prior art keywords
- screw press
- screening section
- screening
- auger
- section
- 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.)
- Abandoned
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 8
- 238000004140 cleaning Methods 0.000 title abstract description 17
- 239000002562 thickening agent Substances 0.000 title 1
- 238000012216 screening Methods 0.000 claims abstract description 123
- 238000000034 method Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 abstract description 21
- 230000007246 mechanism Effects 0.000 abstract description 14
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 239000007921 spray Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 17
- 239000007788 liquid Substances 0.000 description 13
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000004927 wastewater treatment sludge Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- 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
- B01D29/31—Self-supporting filtering elements
- B01D29/35—Self-supporting 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
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
- B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/126—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using drum filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Definitions
- This specification relates to separating solids from liquids, screw presses and to methods of thickening sludge.
- a typical screw press comprises a screw, also called an auger, rotating within a fixed cylindrical body comprising screen panels.
- a solid-liquid mixture to be treated is fed into an inlet end of the screw press.
- the auger conveys the mixture through the cylindrical body while pressing the mixture against the screens.
- Liquid and fine solids are collected from the outside of the screens.
- Retained solids and residual liquid are collected from an outlet end of the screw press.
- the cylindrical body is dismantled when the screens need to be cleaned.
- a screw press is used to separate solids from sewage.
- a screw is driven by an electric motor. The direction of rotation of the screw is reversed periodically to clean the screw press.
- a screw press has a cylindrical body made up of a stack of annular plates. Some of the plates are fixed and some of the plates are movable. An eccentric shaft passing through the stack of plates rotates when the auger rotates. The rotation of the eccentric shaft causes the movable plates to oscillate relative to the fixed plates.
- a screw press described in this specification has a cylindrical screening section mounted to a frame of the press such that the screening section is able to rotate. Restraints between the screening body and the frame may be configured to allow the screening body to rotate or to inhibit or prevent the screening body from rotating.
- a sprayer system is provided on the outside of the screening body.
- a motor may be used to cause the screening body to rotate. Optionally, the motor may also drive an auger within the screening body.
- a screw press described in this specification has a screening body with opening sizes appropriate to retain flocculated solids.
- a sprayer system may be provided on the outside of the screening body.
- an auger shaft may have an increased diameter towards an outlet end of the press.
- a screw press cleaning method described in this specification comprises steps of spraying water at a screening section of the screw press from outside of the screening section.
- the screening section may be rotated while water is sprayed at it.
- the invention provides an alternative device for separating solids from a liquid or an alternative method of operating a screening device.
- the device and method may be used, for example, to thicken sludge from a wastewater treatment plant such as primary or activated sludge from a municipal sewage treatment plant.
- FIG. 1 shows a schematic cross sectional view of a screw press with a screening section.
- FIG. 2 shows a portion of the screening section of FIG. 1 with optional screening section mounts and restraints and optional drive mechanisms for rotating the screening body.
- FIG. 1 shows a screw press 10 having an inlet end 6 and an outlet end 8 .
- the screw press 10 has a cylindrical screening body 12 and a frame 16 .
- the screening body 12 has a non-porous inlet section 20 , a porous screening section 22 and a non-porous outlet section 24 .
- the frame 16 similarly has an inlet portion 26 , a central portion 28 and an outlet portion 30 .
- the inlet portion 26 of the frame 16 may share components with or support the inlet section 20 of the screening body 12 .
- the central portion 28 of the frame 16 at least partially surrounds the screening section 22 of the screening body 12 .
- the outlet portion 30 of the frame 16 may share components with or support the outlet section 24 of the screening body 12 .
- the screw press 10 also has an auger 14 and a drive mechanism 18 .
- the auger 14 is located within the screening body 12 and is supported by the frame 16 .
- the auger 14 and screening body 12 are concentric about a central axis 32 of the screw press 10 .
- One end of a shaft 60 of the auger 14 is supported through a bearing (not shown) on a stationary post 34 attached to the outlet portion 30 of the frame 16 .
- the other end of the auger shaft 60 of the auger 14 is supported on a drive shaft 36 of the drive mechanism 18 .
- a blade 58 of the auger 14 is attached in a spiral around the auger shaft 60 and extends towards, or optionally touches, the inside of the screening body 12 .
- the drive mechanism 18 is attached to the inlet portion 26 of the frame 16 and comprises a motor 38 and a gearbox 40 .
- the frame 16 is supported on the ground through a frame 41 .
- the inlet portion 26 of the frame 16 has an inlet 42 to receive a feed mixture 44 .
- the central portion 28 of the frame 16 has a liquid outlet 46 to discharge a liquid fraction 48 of the feed mixture 44 .
- the outlet portion 30 of the frame 16 has a solids outlet 50 to discharge a solids fraction 52 of the feed mixture.
- the liquid fraction 48 may have some solids remaining in it but at a reduced solids concentration relative to the feed mixture 44 .
- the solids fraction 52 may have some liquid in it but at a higher solids concentration than the feed mixture 44 .
- the feed mixture 44 is pumped into the inlet 42 at an initial pressure.
- the drive mechanism 18 rotates the auger 14 causing the blade 58 to convey the feed mixture 44 along the screening body 12 .
- the auger 14 preferably also increases the pressure of the feed mixture 44 .
- Liquid and fine solids in the feed mixture 44 are forced through the screening body 12 . These liquids and fine solids are collected in the central portion 28 of the frame 16 and discharged through liquid outlet 46 .
- the remainder of the feed mixture 44 exits the screening body 12 after passing by a counter pressure cone 60 .
- Counter pressure cone 60 is biased towards the screening body 12 by a biasing mechanism 62 such as a set of springs or a pneumatic cylinder.
- the solids fraction 52 drops from the end of the screening body 12 and is discharged from the frame 16 through the solids outlet 50 .
- the internal volume of the screening section 22 preferably decreases towards the outlet end 8 of the screw press 10 . This helps maintain pressure in the screening section 22 even though the liquids fraction 48 is removed from the feed mixture 44 .
- a decreasing volume may be obtained by reducing the diameter of the screening section 22 .
- the pitch of the blades 58 may be decreased towards the outlet end 8 of the screw press. Both of these methods, however, prevent the use of a blade 58 having a uniform outer diameter and pitch, which is more easily manufactured to a tight fit with the screening section 22 .
- a decreasing internal volume is provided by increasing the diameter of at least a portion of the shaft 60 towards the outlet end 8 of the screw press 10 .
- the screening section 22 of the screening body 12 has openings of a size and shape adapted to provide a selected degree of separation.
- the screening section 22 may remove fibrous materials from the digestate of an anaerobic digester treating manure or other agricultural wastes.
- the screening section 12 may have smaller openings suited to separating flocculated solids from primary or activated wastewater treatment sludge.
- the screening section 22 may be made from wedgewire with a slot opening in the range from about 0.25 mm to about 0.75 mm.
- any screw press may benefit from having a convenient cleaning method, cleaning is required more frequently when the screening section 22 has small openings.
- the screw press 10 is fitted with a sprayer system 70 to allow cleaning by spraying water against the outside of the screening section 22 .
- water is pumped through a manifold 72 to a series of sprayer heads 74 located inside of the central portion 28 of the frame 16 .
- the screw press 10 of FIG. 1 has one manifold 72 , but there may be multiple manifolds 72 spaced around the circumference of the screening body 12 .
- the water sprayed against the screening section 22 moistens and breaks up accumulations of solids caught in the openings of the screening section. Some of the water may also force its way through the openings of the screening section 22 in a reverse direction.
- the water is preferably heated.
- the supply of feed mixture 44 may be stopped while the auger 14 continues to rotate for a period of time before the water is sprayed. This reduces the volume or pressure, or both, of the feed mixture 44 inside the screening section 22 .
- the screening section 22 may be made up of screen panels 82 having openings 84 .
- the screening section 22 is made up of segments 84 each having a cylindrical screen panel 82 attached to a forward flange 86 and a rearward flange 88 .
- the screening section is built up by attaching the rearward flange 88 of one segment 84 to the forward flange 86 of another segment 84 , optionally by way of fasteners 90 .
- Other methods of constructing a screening section 22 may also be used.
- a forward flange 86 at one end of the screening section 22 is held within a receiver 94 attached to the frame 16 through the inlet section 20 of the screening body 12 .
- the receiver 94 may be attached directly to the frame 16 .
- the receiver 94 contains a bearing, such as a brass or plastic ring or a race of ball bearings, and allows rotation of the screening section 22 .
- a receiver 94 is attached to the frame 16 and holds, but allows rotation of, the other end of the screening section 22 .
- This second receiver 94 may hold a rearward flange 88 or a supplementary flange 92 fastened to a rearward flange 88 .
- At least the screening section 22 of the screening body 12 is allowed to rotate about the central axis 32 .
- one or more non-porous parts of the screening body 12 may also be allowed to rotate.
- intermediate bearing mechanisms 96 may be provided to support, but allow rotation of, the screening section 22 .
- each bearing mechanism 96 has a roller 98 supported through a post 100 by the frame 16 .
- the roller 98 spins on an axle 102 supported by the post 100 .
- Three or more bearing mechanisms 96 may be spaced around the circumference of the frame 16 at each longitudinal position shown in FIG. 1 to better support and center the screening section 22 .
- a lever 104 supported on the end of an axle 102 is attached to an actuator 106 .
- the actuator 106 When the actuator 106 is moved to the left, the lever 104 bears against a forward flange 86 .
- the lever 104 may apply friction to reduce the speed of rotation of the screening section 22 or to stop the screening section 22 from rotating. Moving the actuator 106 to the right lessens or removes the friction. Moving the actuator 106 even further to the right moves the lever 104 to the outside of the forward flange 86 so that the screening section 22 can be pulled out of, or inserted into, the frame 16 .
- FIG. 2 An alternative mechanism for supporting or facilitating a desired rotation of the screening section 22 is shown at the top of FIG. 2 .
- rearward flanges 88 are made in the form of ring gears.
- a gear shaft 110 supported by the frame 16 is fitted with gears 112 that engage the rearward flanges 88 .
- the gear shaft 110 may be supported by the frame 16 at intermediate positions to allow the gears 112 to help support or center the screening section 22 .
- the gear shaft 110 may be attached to a brake such that the gear shaft 110 can be used to stop or slow the rotation of the screening section 22 .
- the gear shaft 110 may be connected to the gearbox 40 of the drive mechanism 18 , or to a separate drive mechanism, so that the gear shaft 110 can be used to drive the rotation of the screening section 22 .
- the screening section 22 When rotation of the screening section 22 is not restrained, the screening section 22 will tend to rotated with the auger 14 due to friction between the auger 14 and the screening section 22 .
- the screening section 22 may be forced to rotate with the auger 14 by actuating a releasable connection (not shown) between the auger 14 and the screening section 22 .
- the screening section 22 may be driven by the drive mechanism 18 without applying force through the auger 14 , for example by use of the gear shaft 110 of FIG. 2 .
- the motor 38 is used, directly or indirectly, to rotate the screening section 22 .
- a separate motor may also be used to rotate the screening section 22 .
- the screening section 22 may be rotated when the auger 14 is not rotating or at a different speed than the auger 14 . In some other examples, such as applying some friction to the screening section 22 while the auger 14 is rotating, the screening section 22 can only be rotated while the auger 14 is rotated but the screening section 22 may rotate at a different speed than the auger 14 .
- the screening section 22 is preferably rotated while water is sprayed against it during the cleaning process described above. Rotating the screening section 22 allows each part of the screening section to pass under a line of sprayer heads 74 . Multiple manifolds 72 are not required. Rotating the screening section 22 also allows each part of the screening section 22 to be placed at or near the top of the screening section 22 so that gravity may assist in the cleaning. Rotating the screening section 22 also avoids having the bottom of the screening section 22 accumulate solids that fall from upper parts of the screening section 22 during cleaning.
- the screening section 22 may be stopped and the auger 14 may be rotated for a period of time during or after the cleaning procedure to convey backwashed solids out of the screening section 22 . Alternatively, the auger 14 may be rotated at a faster speed than the screening section 22 during the cleaning process to convey material released during cleaning out of the screening section 22 .
- the screening section 22 is restrained from rotating, the auger 14 resumes or continues normal rotation, and the supply of feed mixture 44 is restarted.
- the screening section 22 is typically prevented from rotating during operation of the filter press 10 except when cleaning the screening section 22 .
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Microbiology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biodiversity & Conservation Biology (AREA)
- Treatment Of Sludge (AREA)
- General Chemical & Material Sciences (AREA)
Abstract
A screw press has a cylindrical screening section mounted to a frame. The screening section is able to rotate but can be prevented from rotating. A sprayer system is operable to spray water on the screening section. In a cleaning process, the screening section is rotated while water is sprayed against it. Optionally, the power required to rotate the screen may be provided by an auger drive mechanism. The screening section may have openings sized to retain flocculated solids. The screw press may be used to thicken a sludge from a waste water treatment plant.
Description
- This application claims the benefit of U.S. Provisional Application No. 61/636,000 filed Apr. 20, 2012 and U.S. application Ser. No. 13/826,410 filed on Mar. 14, 2013. US provisional application number 61/636,000 and U.S. application Ser. No. 13/826,410 are incorporated by reference.
- This specification relates to separating solids from liquids, screw presses and to methods of thickening sludge.
- In general, a typical screw press comprises a screw, also called an auger, rotating within a fixed cylindrical body comprising screen panels. A solid-liquid mixture to be treated is fed into an inlet end of the screw press. The auger conveys the mixture through the cylindrical body while pressing the mixture against the screens. Liquid and fine solids are collected from the outside of the screens. Retained solids and residual liquid are collected from an outlet end of the screw press. The cylindrical body is dismantled when the screens need to be cleaned.
- In International Publication Number WO02/062564, a screw press is used to separate solids from sewage. A screw is driven by an electric motor. The direction of rotation of the screw is reversed periodically to clean the screw press.
- In International Publication Number WO99/52704, a screw press has a cylindrical body made up of a stack of annular plates. Some of the plates are fixed and some of the plates are movable. An eccentric shaft passing through the stack of plates rotates when the auger rotates. The rotation of the eccentric shaft causes the movable plates to oscillate relative to the fixed plates.
- The following introduction is intended to introduce the reader to the detailed description but not to limit or define the claimed invention.
- A screw press described in this specification has a cylindrical screening section mounted to a frame of the press such that the screening section is able to rotate. Restraints between the screening body and the frame may be configured to allow the screening body to rotate or to inhibit or prevent the screening body from rotating. A sprayer system is provided on the outside of the screening body. A motor may be used to cause the screening body to rotate. Optionally, the motor may also drive an auger within the screening body.
- A screw press described in this specification has a screening body with opening sizes appropriate to retain flocculated solids. Optionally, a sprayer system may be provided on the outside of the screening body. Optionally, an auger shaft may have an increased diameter towards an outlet end of the press.
- A screw press cleaning method described in this specification comprises steps of spraying water at a screening section of the screw press from outside of the screening section. Optionally, the screening section may be rotated while water is sprayed at it.
- The invention provides an alternative device for separating solids from a liquid or an alternative method of operating a screening device. The device and method may be used, for example, to thicken sludge from a wastewater treatment plant such as primary or activated sludge from a municipal sewage treatment plant.
-
FIG. 1 shows a schematic cross sectional view of a screw press with a screening section. -
FIG. 2 shows a portion of the screening section ofFIG. 1 with optional screening section mounts and restraints and optional drive mechanisms for rotating the screening body. -
FIG. 1 shows ascrew press 10 having aninlet end 6 and anoutlet end 8. Thescrew press 10 has acylindrical screening body 12 and aframe 16. Thescreening body 12 has a non-porous inlet section 20, a porous screening section 22 and a non-porous outlet section 24. Theframe 16 similarly has aninlet portion 26, acentral portion 28 and anoutlet portion 30. Theinlet portion 26 of theframe 16 may share components with or support the inlet section 20 of thescreening body 12. Thecentral portion 28 of theframe 16 at least partially surrounds the screening section 22 of thescreening body 12. Theoutlet portion 30 of theframe 16 may share components with or support the outlet section 24 of thescreening body 12. - The
screw press 10 also has anauger 14 and a drive mechanism 18. Theauger 14 is located within thescreening body 12 and is supported by theframe 16. In particular, theauger 14 andscreening body 12 are concentric about acentral axis 32 of thescrew press 10. One end of ashaft 60 of theauger 14 is supported through a bearing (not shown) on astationary post 34 attached to theoutlet portion 30 of theframe 16. The other end of theauger shaft 60 of theauger 14 is supported on adrive shaft 36 of the drive mechanism 18. Ablade 58 of theauger 14 is attached in a spiral around theauger shaft 60 and extends towards, or optionally touches, the inside of thescreening body 12. The drive mechanism 18 is attached to theinlet portion 26 of theframe 16 and comprises amotor 38 and agearbox 40. Theframe 16 is supported on the ground through aframe 41. - The
inlet portion 26 of theframe 16 has an inlet 42 to receive afeed mixture 44. Thecentral portion 28 of theframe 16 has aliquid outlet 46 to discharge aliquid fraction 48 of thefeed mixture 44. Theoutlet portion 30 of theframe 16 has a solids outlet 50 to discharge a solids fraction 52 of the feed mixture. Theliquid fraction 48 may have some solids remaining in it but at a reduced solids concentration relative to thefeed mixture 44. The solids fraction 52 may have some liquid in it but at a higher solids concentration than thefeed mixture 44. - In operation, the
feed mixture 44 is pumped into the inlet 42 at an initial pressure. The drive mechanism 18 rotates theauger 14 causing theblade 58 to convey thefeed mixture 44 along thescreening body 12. Theauger 14 preferably also increases the pressure of thefeed mixture 44. Liquid and fine solids in thefeed mixture 44 are forced through thescreening body 12. These liquids and fine solids are collected in thecentral portion 28 of theframe 16 and discharged throughliquid outlet 46. The remainder of thefeed mixture 44 exits thescreening body 12 after passing by acounter pressure cone 60.Counter pressure cone 60 is biased towards the screeningbody 12 by abiasing mechanism 62 such as a set of springs or a pneumatic cylinder. The solids fraction 52 drops from the end of thescreening body 12 and is discharged from theframe 16 through the solids outlet 50. - The internal volume of the screening section 22 preferably decreases towards the
outlet end 8 of thescrew press 10. This helps maintain pressure in the screening section 22 even though theliquids fraction 48 is removed from thefeed mixture 44. A decreasing volume may be obtained by reducing the diameter of the screening section 22. Alternatively, the pitch of theblades 58 may be decreased towards theoutlet end 8 of the screw press. Both of these methods, however, prevent the use of ablade 58 having a uniform outer diameter and pitch, which is more easily manufactured to a tight fit with the screening section 22. In thescrew press 10 ofFIG. 1 , a decreasing internal volume is provided by increasing the diameter of at least a portion of theshaft 60 towards theoutlet end 8 of thescrew press 10. - The screening section 22 of the
screening body 12 has openings of a size and shape adapted to provide a selected degree of separation. For example, the screening section 22 may remove fibrous materials from the digestate of an anaerobic digester treating manure or other agricultural wastes. Alternatively, thescreening section 12 may have smaller openings suited to separating flocculated solids from primary or activated wastewater treatment sludge. For example, the screening section 22 may be made from wedgewire with a slot opening in the range from about 0.25 mm to about 0.75 mm. - Although any screw press may benefit from having a convenient cleaning method, cleaning is required more frequently when the screening section 22 has small openings. In particular, when the
screw press 10 is used to thicken sludge, dismantling thescrew press 10 for cleaning is undesirable. Thescrew press 10 is fitted with asprayer system 70 to allow cleaning by spraying water against the outside of the screening section 22. When cleaning is required, water is pumped through a manifold 72 to a series of sprayer heads 74 located inside of thecentral portion 28 of theframe 16. Thescrew press 10 ofFIG. 1 has onemanifold 72, but there may bemultiple manifolds 72 spaced around the circumference of thescreening body 12. - The water sprayed against the screening section 22 moistens and breaks up accumulations of solids caught in the openings of the screening section. Some of the water may also force its way through the openings of the screening section 22 in a reverse direction. The water is preferably heated. In order to assist the water in cleaning the screening section 22, the supply of
feed mixture 44 may be stopped while theauger 14 continues to rotate for a period of time before the water is sprayed. This reduces the volume or pressure, or both, of thefeed mixture 44 inside the screening section 22. - Referring to
FIG. 2 , the screening section 22 may be made up of screen panels 82 havingopenings 84. In the construction shown inFIG. 2 , the screening section 22 is made up ofsegments 84 each having a cylindrical screen panel 82 attached to aforward flange 86 and arearward flange 88. The screening section is built up by attaching therearward flange 88 of onesegment 84 to theforward flange 86 of anothersegment 84, optionally by way of fasteners 90. Other methods of constructing a screening section 22 may also be used. - Referring back to
FIG. 1 , aforward flange 86 at one end of the screening section 22 is held within areceiver 94 attached to theframe 16 through the inlet section 20 of thescreening body 12. Alternatively, thereceiver 94 may be attached directly to theframe 16. Thereceiver 94 contains a bearing, such as a brass or plastic ring or a race of ball bearings, and allows rotation of the screening section 22. Similarly, areceiver 94 is attached to theframe 16 and holds, but allows rotation of, the other end of the screening section 22. Thissecond receiver 94 may hold arearward flange 88 or a supplementary flange 92 fastened to arearward flange 88. In this way, at least the screening section 22 of thescreening body 12 is allowed to rotate about thecentral axis 32. Optionally, one or more non-porous parts of thescreening body 12 may also be allowed to rotate. Optionally, intermediate bearing mechanisms 96 may be provided to support, but allow rotation of, the screening section 22. - Referring back to
FIG. 2 , each bearing mechanism 96 has a roller 98 supported through a post 100 by theframe 16. The roller 98 spins on anaxle 102 supported by the post 100. Three or more bearing mechanisms 96 may be spaced around the circumference of theframe 16 at each longitudinal position shown inFIG. 1 to better support and center the screening section 22. Alever 104 supported on the end of anaxle 102 is attached to anactuator 106. When theactuator 106 is moved to the left, thelever 104 bears against aforward flange 86. Thelever 104 may apply friction to reduce the speed of rotation of the screening section 22 or to stop the screening section 22 from rotating. Moving theactuator 106 to the right lessens or removes the friction. Moving theactuator 106 even further to the right moves thelever 104 to the outside of theforward flange 86 so that the screening section 22 can be pulled out of, or inserted into, theframe 16. - An alternative mechanism for supporting or facilitating a desired rotation of the screening section 22 is shown at the top of
FIG. 2 . In this alternative,rearward flanges 88 are made in the form of ring gears. A gear shaft 110 supported by theframe 16 is fitted with gears 112 that engage therearward flanges 88. The gear shaft 110 may be supported by theframe 16 at intermediate positions to allow the gears 112 to help support or center the screening section 22. Alternatively or additionally, the gear shaft 110 may be attached to a brake such that the gear shaft 110 can be used to stop or slow the rotation of the screening section 22. Alternatively or additionally, the gear shaft 110 may be connected to thegearbox 40 of the drive mechanism 18, or to a separate drive mechanism, so that the gear shaft 110 can be used to drive the rotation of the screening section 22. - When rotation of the screening section 22 is not restrained, the screening section 22 will tend to rotated with the
auger 14 due to friction between theauger 14 and the screening section 22. Optionally, the screening section 22 may be forced to rotate with theauger 14 by actuating a releasable connection (not shown) between theauger 14 and the screening section 22. Alternatively, the screening section 22 may be driven by the drive mechanism 18 without applying force through theauger 14, for example by use of the gear shaft 110 ofFIG. 2 . In all of these examples, themotor 38 is used, directly or indirectly, to rotate the screening section 22. A separate motor may also be used to rotate the screening section 22. In some of the examples above, the screening section 22 may be rotated when theauger 14 is not rotating or at a different speed than theauger 14. In some other examples, such as applying some friction to the screening section 22 while theauger 14 is rotating, the screening section 22 can only be rotated while theauger 14 is rotated but the screening section 22 may rotate at a different speed than theauger 14. - The screening section 22 is preferably rotated while water is sprayed against it during the cleaning process described above. Rotating the screening section 22 allows each part of the screening section to pass under a line of sprayer heads 74.
Multiple manifolds 72 are not required. Rotating the screening section 22 also allows each part of the screening section 22 to be placed at or near the top of the screening section 22 so that gravity may assist in the cleaning. Rotating the screening section 22 also avoids having the bottom of the screening section 22 accumulate solids that fall from upper parts of the screening section 22 during cleaning. Optionally, the screening section 22 may be stopped and theauger 14 may be rotated for a period of time during or after the cleaning procedure to convey backwashed solids out of the screening section 22. Alternatively, theauger 14 may be rotated at a faster speed than the screening section 22 during the cleaning process to convey material released during cleaning out of the screening section 22. - After the cleaning procedure, the screening section 22 is restrained from rotating, the
auger 14 resumes or continues normal rotation, and the supply offeed mixture 44 is restarted. The screening section 22 is typically prevented from rotating during operation of thefilter press 10 except when cleaning the screening section 22.
Claims (25)
1. A screw press having a screening section that may be selectively fixed or allowed to rotate.
2. The screw press of claim 1 wherein the screening section is generally cylindrical and mounted to a frame of the screw press such that the screening section may rotate relative to the frame.
3. The screw press of claim 1 comprising a releasable restraint between the screening section and the frame.
4. The screw press of claim 1 further comprising a sprayer system located outside of the screening body.
5. The screw press of claim 1 further comprising an auger within the screening body.
6. The screw press of claim 1 wherein the auger has a shaft with increased diameter towards an outlet end of the screw press.
7. The screw press of claim 1 comprising a motor adapted to rotate the screening section.
8. The screw press of claim 7 wherein the motor is adapted to rotate the screening section by way of rotating the auger while the screening section is allowed to rotate.
9. The screw press of claim 7 comprising a detachable connection between the motor and the screening section.
10. The screw press of claim 1 wherein the screening section has openings sized to remove floc from a sludge.
11. The screw press of claims 1 wherein the screening section comprises wedgewire with a slot opening in the range from about 0.25 mm to about 0.75 mm.
12. A screw press having a screening section with openings sized to remove floc from a sludge.
13. The screw press of claim 12 wherein the screening section comprises wedgewire with a slot opening in the range from about 0.25 mm to about 0.75 mm.
14. The screw press of claim 12 having an auger with a constant outside diameter.
15. The screw press of claim 14 wherein the auger has a shaft with increased diameter towards an outlet end of the screw press.
16. A screw press comprising a screening section and an auger, wherein the auger has a shaft with an increased diameter towards an outlet end of the screw press.
17. A process of operating a screw press comprising a step of spraying water against a screening section of the screw press.
18. The process of claim 17 further comprising a step of rotating the screening section while spraying water against it.
19. The process of claim 17 wherein the screening section is rotated by power supplied by a motor that rotates an auger of the screw press.
20. The process of claim 17 comprises a step of releasing a restraint on the screening section such that rotation of the auger causes rotation of the screening section.
21. (canceled)
22. (canceled)
23. (canceled)
24. (canceled)
25. (canceled)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/395,599 US20150076085A1 (en) | 2012-04-20 | 2013-04-18 | Sludge screw thickener with screen rotation during cleaning |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201261636000P | 2012-04-20 | 2012-04-20 | |
US13/826,410 US9561978B2 (en) | 2012-04-20 | 2013-03-14 | Sludge screw thickener with screen rotation during cleaning |
PCT/CA2013/050297 WO2013155630A1 (en) | 2012-04-20 | 2013-04-18 | Sludge screw thickener with screen rotation during cleaning |
US14/395,599 US20150076085A1 (en) | 2012-04-20 | 2013-04-18 | Sludge screw thickener with screen rotation during cleaning |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/826,410 Continuation US9561978B2 (en) | 2012-04-20 | 2013-03-14 | Sludge screw thickener with screen rotation during cleaning |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150076085A1 true US20150076085A1 (en) | 2015-03-19 |
Family
ID=49379144
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/826,410 Active 2033-10-29 US9561978B2 (en) | 2012-04-20 | 2013-03-14 | Sludge screw thickener with screen rotation during cleaning |
US14/395,599 Abandoned US20150076085A1 (en) | 2012-04-20 | 2013-04-18 | Sludge screw thickener with screen rotation during cleaning |
US14/395,717 Abandoned US20150076059A1 (en) | 2012-04-20 | 2013-04-19 | Anaerobic treatment of industrial wastewater |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/826,410 Active 2033-10-29 US9561978B2 (en) | 2012-04-20 | 2013-03-14 | Sludge screw thickener with screen rotation during cleaning |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/395,717 Abandoned US20150076059A1 (en) | 2012-04-20 | 2013-04-19 | Anaerobic treatment of industrial wastewater |
Country Status (4)
Country | Link |
---|---|
US (3) | US9561978B2 (en) |
EP (1) | EP2838717A4 (en) |
CA (1) | CA2870947A1 (en) |
WO (1) | WO2013155630A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130277319A1 (en) * | 2012-04-20 | 2013-10-24 | Anaergia Inc. | Sludge screw thickener with screen rotation during cleaning |
WO2017211363A1 (en) | 2016-06-07 | 2017-12-14 | Gea Process Engineering A/S | Screw press apparatus including an improved cip arrangement and method of cleaning the apparatus |
CN110668669A (en) * | 2019-09-26 | 2020-01-10 | 浙江中卓环境科技有限公司 | Mud-water separation system |
US10974982B2 (en) * | 2013-07-26 | 2021-04-13 | Ishigaki Company Limited | Recovery device and recovery method for recovering specific material from sludge |
US11931677B2 (en) * | 2020-01-31 | 2024-03-19 | Hydra Water Ab | Separation device and method to separate contaminants from contaminated water |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR112014005169A2 (en) * | 2011-09-06 | 2017-04-11 | Anaeco Ltd | separation method and instrument |
US9540270B2 (en) | 2012-04-20 | 2017-01-10 | Anaergia Inc. | Anaerobic treatment of industrial wastewater |
PL2754552T3 (en) * | 2013-01-09 | 2018-12-31 | Röhren- und Pumpenwerk Bauer GmbH | Worm press separator and method for operating the worm press separator |
NL1040425C2 (en) | 2013-10-02 | 2015-04-07 | Technologies Holding B V D | METHOD AND DEVICE FOR SEPARATING LIGHER PARTICLES AND HEAVIER PARTICLES |
US11180391B2 (en) * | 2013-10-02 | 2021-11-23 | Anaergia B.V. | Method and device for processing solid waste |
US20160045844A1 (en) * | 2014-08-13 | 2016-02-18 | Samuel N. Tyler | Pulsed Backwash Method and Apparatus |
CN104402189A (en) * | 2014-10-14 | 2015-03-11 | 轻工业环境保护研究所 | Laminated dehydrator having mud-scraping knife |
EP3370889B1 (en) | 2015-11-02 | 2020-04-08 | Anaergia B.V. | Method and device for processing solid waste |
EP3225596B1 (en) * | 2016-03-30 | 2020-05-20 | FCC Aqualia, S.A. | Anaerobic process and installation with filtration procedure for treating wastewater at room temperature |
CN109071267A (en) * | 2016-04-11 | 2018-12-21 | 凯米拉公司 | Improve the sludge dewatering ability and energy balance of wastewater treatment |
US10143944B2 (en) * | 2016-05-04 | 2018-12-04 | Ovivo Inc. | Filter underdrain with internal air scour laterals |
EP3458421A4 (en) | 2016-05-17 | 2020-01-22 | Anaergia Inc. | Sewage sludge processing with multi-stage thermophilic digester |
US10550023B2 (en) | 2016-08-22 | 2020-02-04 | Anaergia Inc. | Two stage anaerobic digestion with intermediate hydrolysis |
US20180280840A1 (en) * | 2017-03-29 | 2018-10-04 | Larry Baxter | Method and Device for Separating Solids and Liquids using a Modified Pump |
US10967300B2 (en) * | 2017-08-29 | 2021-04-06 | Green Flow Industries, LLC | Transportable separation and monitoring apparatus with auger |
CN107935177B (en) * | 2017-12-29 | 2024-03-01 | 哈尔滨工业大学 | Membrane aeration anaerobic granular sludge reactor and efficient denitrification and greenhouse gas emission reduction method thereof |
CA3105070A1 (en) * | 2018-06-28 | 2020-01-02 | Aecom | Continuous flow wastewater treatment system |
GB2586200A (en) * | 2019-04-25 | 2021-02-17 | Sem Energy Ltd | Apparatus and method |
CA3057084A1 (en) * | 2019-01-09 | 2020-07-09 | Jeremy Leonard | Centrifugal separator |
ES2789874B2 (en) * | 2019-04-25 | 2022-01-25 | Sist Azud S A | Filtration process of heterogeneous fluids that present matter in suspension |
KR102504657B1 (en) * | 2019-11-18 | 2023-02-27 | 주식회사 엘지화학 | Pressurizing centrifugal dehydrator |
CN114804564A (en) * | 2021-01-29 | 2022-07-29 | 阿法拉伐股份有限公司 | Method for removing solids from biogas residues obtained from biogas plants |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04118198A (en) * | 1990-09-04 | 1992-04-20 | Ishigaki Mech Ind Co | Device for removing blinding of screen drum of screw press |
JPH0740086A (en) * | 1993-07-29 | 1995-02-10 | Ishigaki Mech Ind Co | Operation control device of screw press |
JP2000033495A (en) * | 1998-07-15 | 2000-02-02 | Fukoku Kogyo Kk | Rotary screen |
JP2009142723A (en) * | 2007-12-12 | 2009-07-02 | Hitachi Plant Technologies Ltd | Apparatus for separating and dehydrating influent scum |
JP2011020080A (en) * | 2009-07-17 | 2011-02-03 | Hitachi Plant Technologies Ltd | Apparatus for separating and dehydrating sewage sludge |
US9561978B2 (en) * | 2012-04-20 | 2017-02-07 | Anaergia Inc. | Sludge screw thickener with screen rotation during cleaning |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1564585A (en) * | 1924-09-05 | 1925-12-08 | Ji Case Threshing Machine Co | Weed screen for thrashing machines |
US2634776A (en) * | 1951-08-02 | 1953-04-14 | Maurice H Kowan | Vegetable and fruit pulping and juicing machine |
SE421434B (en) * | 1978-06-14 | 1981-12-21 | Berggren Torsten L | SCREW PRESS |
SE456149B (en) * | 1987-02-18 | 1988-09-12 | Hedemora Ab | PROCEDURE AND DEVICE FOR DRAINAGE AND PRESSURE OF MATERIALS BY A SCREW PRESSURE |
JPH0698513B2 (en) | 1990-04-23 | 1994-12-07 | 石垣機工株式会社 | Feeder for undiluted solution in screw press |
FR2663240B1 (en) * | 1990-06-14 | 1992-09-04 | Perfojet | APPARATUS FOR SEPARATING A LIQUID AND SUSPENDED SOLID PARTICLES THEREIN. |
JPH0698517B2 (en) | 1990-06-28 | 1994-12-07 | 石垣機工株式会社 | Cleaning method and device for screw press |
JPH0698515B2 (en) * | 1990-11-29 | 1994-12-07 | 石垣機工株式会社 | Screw press operating method and device |
US6395187B1 (en) * | 1998-10-01 | 2002-05-28 | Noe Martinez Alanis | Horizontal solids recycler |
CA2388259A1 (en) * | 2002-05-30 | 2003-11-30 | Sophia Cummings | Solid and liquid separation device |
JP4373832B2 (en) | 2004-03-30 | 2009-11-25 | 三菱化工機株式会社 | Screw press |
US8017021B1 (en) * | 2006-02-01 | 2011-09-13 | Staples Wesley A | Sludge processing apparatus and method |
US8580113B2 (en) * | 2010-08-31 | 2013-11-12 | Zenon Technology Partnership | Method for utilizing internally generated biogas for closed membrane system operation |
US8302780B1 (en) * | 2012-02-22 | 2012-11-06 | M2 Renewables, Inc. | Industrial separator and dewatering plant |
US20130213904A1 (en) * | 2012-02-22 | 2013-08-22 | M2 Renewables, Inc. | Industrial separator and dewatering plant |
US9822020B2 (en) * | 2012-12-18 | 2017-11-21 | Anaergia Inc. | Nutrient recovery process |
-
2013
- 2013-03-14 US US13/826,410 patent/US9561978B2/en active Active
- 2013-04-18 EP EP13779000.2A patent/EP2838717A4/en not_active Withdrawn
- 2013-04-18 WO PCT/CA2013/050297 patent/WO2013155630A1/en active Application Filing
- 2013-04-18 US US14/395,599 patent/US20150076085A1/en not_active Abandoned
- 2013-04-18 CA CA2870947A patent/CA2870947A1/en not_active Abandoned
- 2013-04-19 US US14/395,717 patent/US20150076059A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04118198A (en) * | 1990-09-04 | 1992-04-20 | Ishigaki Mech Ind Co | Device for removing blinding of screen drum of screw press |
JPH0740086A (en) * | 1993-07-29 | 1995-02-10 | Ishigaki Mech Ind Co | Operation control device of screw press |
JP2000033495A (en) * | 1998-07-15 | 2000-02-02 | Fukoku Kogyo Kk | Rotary screen |
JP2009142723A (en) * | 2007-12-12 | 2009-07-02 | Hitachi Plant Technologies Ltd | Apparatus for separating and dehydrating influent scum |
JP2011020080A (en) * | 2009-07-17 | 2011-02-03 | Hitachi Plant Technologies Ltd | Apparatus for separating and dehydrating sewage sludge |
US9561978B2 (en) * | 2012-04-20 | 2017-02-07 | Anaergia Inc. | Sludge screw thickener with screen rotation during cleaning |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130277319A1 (en) * | 2012-04-20 | 2013-10-24 | Anaergia Inc. | Sludge screw thickener with screen rotation during cleaning |
US9561978B2 (en) * | 2012-04-20 | 2017-02-07 | Anaergia Inc. | Sludge screw thickener with screen rotation during cleaning |
US10974982B2 (en) * | 2013-07-26 | 2021-04-13 | Ishigaki Company Limited | Recovery device and recovery method for recovering specific material from sludge |
WO2017211363A1 (en) | 2016-06-07 | 2017-12-14 | Gea Process Engineering A/S | Screw press apparatus including an improved cip arrangement and method of cleaning the apparatus |
WO2017211369A1 (en) | 2016-06-07 | 2017-12-14 | Gea Process Engineering A/S | Screw press apparatus including an improved cip arrangement and method of cleaning the apparatus |
DE202017007084U1 (en) | 2016-06-07 | 2019-06-13 | Gea Process Engineering A/S | Screw press device with an improved CIP (Clean in Place) arrangement |
US10850465B2 (en) | 2016-06-07 | 2020-12-01 | Gea Process Engineering A/S | Screw press apparatus including an improved CIP arrangement and method of cleaning the apparatus |
CN110668669A (en) * | 2019-09-26 | 2020-01-10 | 浙江中卓环境科技有限公司 | Mud-water separation system |
US11931677B2 (en) * | 2020-01-31 | 2024-03-19 | Hydra Water Ab | Separation device and method to separate contaminants from contaminated water |
Also Published As
Publication number | Publication date |
---|---|
EP2838717A4 (en) | 2015-12-30 |
EP2838717A1 (en) | 2015-02-25 |
US20130277319A1 (en) | 2013-10-24 |
WO2013155630A1 (en) | 2013-10-24 |
CA2870947A1 (en) | 2013-10-24 |
US20150076059A1 (en) | 2015-03-19 |
US9561978B2 (en) | 2017-02-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9561978B2 (en) | Sludge screw thickener with screen rotation during cleaning | |
CA2870952A1 (en) | Anaerobic treatment of industrial wastewater | |
US20110198268A1 (en) | Hybrid rotary screen separator | |
CN109647855B (en) | Industrial solid waste treatment device | |
US20130299395A1 (en) | Hybrid Rotary Screen Separator | |
US20150343344A1 (en) | Cleaning Systems and Methods for Rotary Screen Separators | |
US8151702B2 (en) | Device for dehumidifying and compacting solids contained in sewage for disposal | |
JP5815417B2 (en) | Solid-liquid separation device, sludge treatment system, and solid-liquid separation method | |
EP2314446A3 (en) | Screw press | |
WO2007032605A1 (en) | Screw type solid-liquid separation appartus | |
EP1194383A1 (en) | Device for dehydrating sludge | |
KR20170049730A (en) | Sewage treatment plant of portable toilets | |
KR101623259B1 (en) | Apparatus for low separating solid and liquid | |
CN205235546U (en) | Sewage prefiltration processing apparatus | |
US20160096125A1 (en) | Sludge classification press having a rotationally adjustable separation screen | |
JP2007029930A (en) | Solid-liquid separator | |
CN102068846B (en) | Hair filter | |
KR20130072505A (en) | Membrane filtration apparatus | |
CN209307168U (en) | A kind of micropolis sewage disposal system | |
JP2008012524A (en) | Solid-liquid separator | |
CN107915266B (en) | Waste water treatment device with centrifugal sliding type filter frame | |
JP2009213986A (en) | Sludge flocculating apparatus and sludge treatment apparatus having the same | |
WO2011001467A1 (en) | Sludge flocking unit and sludge treatment system with flocking unit | |
CN219784047U (en) | Agricultural sewage solid-liquid separation device | |
KR101678768B1 (en) | Screw-type low-speed solid-liquid separation apparatus |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |