Process and apparatus for the separation of solids from slimy liquids by means of press screw separators

• US 5,118,427 A
• Filed: 02/11/1991
• Issued: 06/02/1992
• Est. Priority Date: 02/10/1990
• Status: Expired due to Term

• Current Assignee: Gebr Tigges GMBH & Company KG (Gebr)
• Original Assignee: Fan Engineering GmbH
• Inventors: Eichler, Dietrich
• Primary Examiner(s): Jones, W. Gary
• Assistant Examiner(s): FORTUNA, ANA M
• Application Number:
  US07/653,161
• Time in Patent Office: 477 Days
• Field of Search: 210/770, 210/768, 210/204, 210/415, 210/767, 210/230, 210/414, 210/788, 210/145, 210/197, 210/748, 210/744, 210/770, 210/788, 210/197, 210/145, 210/414, 210/415, 100/145, 100/117, 100/45, 100/30, 100/45, 100/117
• US Class Current: 210/748.01
• CPC Class Codes: B01D 29/25 open-ended the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of the filtering element
• CPC Class Codes: B01D 29/445 Bar screens
• CPC Class Codes: B01D 29/6476 with a rotary movement with respect to the filtering element
• CPC Class Codes: B01D 29/865 by vibration of the liquid
• CPC Class Codes: B01D 29/906 Special treatment of the feed stream before contacting the filtering element, e.g. cutting B01D35/24, B01D37/02, B01D37/03 take precedence
• CPC Class Codes: B30B 9/127 Feed means
• CPC Class Codes: C02F 11/12 by de-watering, drying or thickening

Abstract

Slimy liquids, such as slimy manure, are passed through a press screw separator to separate the solids. Vibrations are introduced into the slimy liquid for reducing its viscosity to enable the liquid to more readily gravitate through a screen basket of the separator.

Claims

1. A process for the separation of solids from slimy liquid comprising the steps of introducing the slimy liquid into a press screw separator having a screen basket, introducing vibrations into the slimy liquid for reducing the viscosity thereof to promote a gravity discharge of the liquid through the screen basket.

2. A process according to claim 1, wherein said separator includes a charging space located upstream of said screen basket, the vibrations are introduced into the slimy liquid within said charging space.

3. A process according to claim 1, wherein said separator includes a screw conveyor for advancing the slimy liquid through said screen basket, said separator further including a compression zone located downstream of said screw conveyor and arranged such that solids which have been dewatered while being advanced along said screw conveyor are compressed in said compression zone.

4. A press screw separator for the separation of solids from slimy liquids, said separator including a housing having inlet means for receiving slimy liquid, a cylindrical screen basket disposed downstream of said inlet means for the gravity separation of liquid, a motor-driven screw for feeding the slimy liquid into said screen basket, and vibration means for introducing vibrations into the slimy liquid downstream of said inlet means for reducing the viscosity of the slimy liquid to promote a gravity discharge of the liquid through said screen basket.

5. A press screw separator according to claim 4, wherein said separator includes a charging space disposed between said inlet means and said screen basket, said vibration means arranged to introduce vibrations into the slimy liquid within said charging space.

6. Apparatus according to claim 4, wherein said vibration means includes a vibrator mounted outside of said housing, and a transducer mounted inside of said housing, and vibration transmitting means passing through an opening in said housing and interconnecting said vibrator and said transducer, said vibration transmitting means including an elastic membrane arranged across said opening to prevent the escape of liquid from said housing.

7. Apparatus according to claim 6, wherein said membrane is mounted at its periphery to said housing, said vibration transmitting means including first means connecting said vibrator with said membrane, and second means interconnecting said membrane with said transducer.

8. Apparatus according to claim 6 including means mounting said vibrator for movement relative to said housing, and elastic damping means interposed between said vibrator and said housing.

9. Apparatus according to claim 8, wherein said means mounting said vibrator comprises a stabilizer arm pivotably mounted at one end to said housing and carrying said vibrator at the other end.

10. Apparatus according to claim 4, wherein said vibrator generates non-directional vibrations.