WO1993013846A1 - Appareil d'egouttage de boues - Google Patents

Appareil d'egouttage de boues Download PDF

Info

Publication number
WO1993013846A1
WO1993013846A1 PCT/DK1993/000013 DK9300013W WO9313846A1 WO 1993013846 A1 WO1993013846 A1 WO 1993013846A1 DK 9300013 W DK9300013 W DK 9300013W WO 9313846 A1 WO9313846 A1 WO 9313846A1
Authority
WO
WIPO (PCT)
Prior art keywords
sludge
sieve drum
open
rinsing water
drum
Prior art date
Application number
PCT/DK1993/000013
Other languages
English (en)
Inventor
Emil Hestbek
Original Assignee
I. Krüger Systems As
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 I. Krüger Systems As filed Critical I. Krüger Systems As
Publication of WO1993013846A1 publication Critical patent/WO1993013846A1/fr

Links

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
    • C02F11/126—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using drum filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/11—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/72—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/72—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding
    • B01D33/722—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding containing fixed liquid displacement elements or cores
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/18—Machines or apparatus for drying solid materials or objects with movement which is non-progressive on or in moving dishes, trays, pans, or other mainly-open receptacles
    • F26B11/181—Machines or apparatus for drying solid materials or objects with movement which is non-progressive on or in moving dishes, trays, pans, or other mainly-open receptacles the receptacle being a foraminous, perforated or open-structured drum or drum-like container, e.g. rotating around a substantially horizontal or vertical axis; the receptacle being multiple perforated drums, e.g. in superimposed arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat

Definitions

  • the present invention relates to an apparatus for the dewatering of sludge, in particular waste water sludge, which apparatus comprises a sieve drum rotatable around a substantially horizontal axis, said drum being closed at the one end and open at the other end, a sludge feed pipe extending from the open end of the sieve drum to an area in the vicinity of the inner side of the sieve drum at its closed end, means for collecting partially dewatered sludge passing out of the sieve drum at its open end and means for supplying rinsing water to the upper surface of the sieve drum to remove sludge residues therefrom.
  • waste water sludge has a content of solids of between 0.5 and 2% by weight. A portion of the solids is typically of a colloid character and hence it is difficult to precipitate.
  • Such a concentration tank makes it possible to obtain such an increase in the content of sludge solids that the concentrated sludge can be subjected to a dewatering proper in conventional sludge dewatering apparatuses, e.g. a centrifuge, a belt screen press or a chamber filter press.
  • a dewatering proper in conventional sludge dewatering apparatuses, e.g. a centrifuge, a belt screen press or a chamber filter press.
  • the content of solids can be increased to 18-35% by weight and hence the amount of sludge is significantly reduced and simultaneously it becomes possible to remove the sludge in open tanks.
  • a flocculant e.g. an electrolyte
  • a flocculant is ordinarily added to the waste water sludge in an amount of from 0.2 to 0.5% of the total amount of sludge before continously feeding the sludge through the sludge feed pipe onto the inner side of the rotatable sieve drum, the sieve surface of which consists of a nylon or metal wire screen, and a radially inwards extending helical flange is mounted on the inner side of the sieve drum, the twist direction of said flange being so that during operation of the sieve drum sludge is conveyed in the direction towards the discharge end of the sieve drum.
  • the sieve drum typically rotates at a rate of between 1.5 and 9 rpm and consequently the sludge will be conveyed slowly from the closed end of the sieve drum towards its open end.
  • the sludge will be partially dewatered as a portion of the water contained in the sludge passes through the sieve surface of the sieve drum and further down onto a collecting tray located beneath the sieve drum.
  • rinsing water is supplied continuously or intermittently onto the upper surface of the sieve drum by means of a row of nozzles located a short distance above the upper side of the drum along its entire length.
  • the rinsing water flows from the upper portion of the sieve drum and either direcly down into the sludge or down into a separate collecting tray conducting the rinsing water to the open end of the drum, where it is supplied to the partially dewatered sludge.
  • both methods counteract the dewatering of the sludge.
  • the object of the present invention is to avoid this drawback.
  • this object is obtained with a sludge feed pipe which is open upwards and is located in the zone below the means for supplying rinsing water.
  • the upwards open pipe has a U shaped sectional profile. Such a shape allows substantially all the rinsing water to be caught.
  • the means for supplying rinsing water to the upper surface of the sieve drum preferably comprise a row of closely spaced nozzles arranged on a common supply pipe located vertically above the rotation axis of the drum.
  • Fig. 1 is a perspective view of a sludge dewatering apparatus according to the invention, wherein portions of the casing and the sieve surface of the sieve drum are removed,
  • Fig. 2 is a side view partially in section of the apparatus of Fig. 1 without casing
  • Fig. 3 is a vertical section through the sieve drum, casing and support of an apparatus according to Figs. 1 and 2.
  • the apparatus shown in Figs 1, 2 and 3 comprises a casing 1 mounted on a frame 2.
  • the casing 1 has a tray shaped bottom 3 with a discharge pipe 4.
  • a rotatable sieve drum 5 is mounted around a substantially horizontal axis and on the inside of the drum helical flange segments 6 are located.
  • the casing 1 has an opening 7 located directly above a funnel 8 having a discharge pipe 9.
  • the apparatus shown further comprises a supply pipe 11 for sludge to be dewatered.
  • Said supply pipe 11 is connected with an upwards open U shaped feed pipe 12 debouching near the opposite end of the sieve drum 5.
  • the apparatus further comprises a row of nozzles 13 arranged on a pipe 14 extending over the entire length of the sieve drum and connected to a water supply pipe 15 having a valve 16.
  • the apparatus shown comprises supporting rollers 17 located at the open end of the sieve drum and drive means (not shown) for rotating the same.
  • sludge to be dewatered is fed to the inner side of the sieve drum 5 at its closed end, the sludge being supplied through the supply pipe 11 and the upwards open feed pipe 12.
  • the sludge will move towards the opening 7 in a slow stream and simultaneously be dewatered gradually as water passes through the wall of the sieve drum and is collected on the tray shaped bottom 3 of the casing 1, from which it is removed through the dicharge pipe 4. Having reached the opening 7 the partially dewatered sludge falls down into the funnel 8, from which it is discharged through the discharge pipe 9.
  • the sieve drum In order to remove sludge deposited on or in the sieve wall of the sieve drum 5, the sieve drum is sprayed continuously or intermittently with rinsing water supplied through the nozzles 13. A major portion of the rinsing water falling down together with the removed sludge residues from the upper portion of the drum towards its bottom, will be caught by the upwards open feed pipe 12. As a result, it is avoided that the rinsing water wets the sludge which has already been dewatered.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Treatment Of Sludge (AREA)

Abstract

Appareil d'égouttage de boues comportant un tambour tamiseur (5) monté rotatif autour d'un axe sensiblement horizontal et fermé à l'une de ses extrémités tandis que l'autre extrémité est ouverte. Il comporte également un dispositif (13) déversant de l'eau de rinçage sur la surface supérieure du tambour tamiseur (5) afin d'en évacuer les résidus de boue, un tuyau d'amenée (12) de boues s'ouvrant vers le haut et s'étendant de l'extrémité ouverte (7) du tambour tamiseur (5) jusqu'à une zone voisine de la face intérieure du tambour tamiseur (5) au niveau de son extrémité fermée, ledit tuyau d'amenée étant placé dans la zone située sous le dispositif (13) d'amenée d'eau de rinçage, ainsi qu'un dispositif (8) servant à recueillir les boues partiellement égouttées à leur sortie de l'extrémité ouverte (7) du tambour tamiseur (5). Ledit tuyau d'amenée (12) de boues s'ouvrant vers le haut achemine jusqu'à l'extrémité fermée du tambour tamiseur (5) les eaux usées et les résidus de boue afin que les boues partiellement égouttées ne puissent être mouillées à nouveau par l'eau de rinçage.
PCT/DK1993/000013 1992-01-20 1993-01-18 Appareil d'egouttage de boues WO1993013846A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK006392A DK6392A (da) 1992-01-20 1992-01-20 Apparat til afvanding af slam
DK0063/92 1992-01-20

Publications (1)

Publication Number Publication Date
WO1993013846A1 true WO1993013846A1 (fr) 1993-07-22

Family

ID=8089314

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1993/000013 WO1993013846A1 (fr) 1992-01-20 1993-01-18 Appareil d'egouttage de boues

Country Status (3)

Country Link
AU (1) AU3448793A (fr)
DK (1) DK6392A (fr)
WO (1) WO1993013846A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5543051A (en) * 1992-11-06 1996-08-06 The Minister For Public Works And Services For And On Behalf Of The State Of New South Wales Biological phosphorus removal from waste water
EP1236493A1 (fr) * 2001-02-26 2002-09-04 Van Remmen UV techniek Filtre separateur
GB2501122A (en) * 2012-04-13 2013-10-16 Siemens Vai Metals Tech Gmbh Slurry dewatering and filtering device
JP2020093224A (ja) * 2018-12-13 2020-06-18 株式会社タクマ 回転ドラム型汚泥濃縮装置
JP2020093223A (ja) * 2018-12-13 2020-06-18 株式会社タクマ 回転ドラム型汚泥濃縮装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3401801A (en) * 1965-08-20 1968-09-17 Passavant Werke Apparatus for separating the liquid phase and the solid phase in mixtures of liquid matter and solid matter
US4507202A (en) * 1982-01-18 1985-03-26 Dan Nord Device for the separation of a liquid

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3401801A (en) * 1965-08-20 1968-09-17 Passavant Werke Apparatus for separating the liquid phase and the solid phase in mixtures of liquid matter and solid matter
US4507202A (en) * 1982-01-18 1985-03-26 Dan Nord Device for the separation of a liquid

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5543051A (en) * 1992-11-06 1996-08-06 The Minister For Public Works And Services For And On Behalf Of The State Of New South Wales Biological phosphorus removal from waste water
EP1236493A1 (fr) * 2001-02-26 2002-09-04 Van Remmen UV techniek Filtre separateur
GB2501122A (en) * 2012-04-13 2013-10-16 Siemens Vai Metals Tech Gmbh Slurry dewatering and filtering device
WO2013153186A1 (fr) * 2012-04-13 2013-10-17 Siemens Vai Metals Technologies Gmbh Dispositif de déshydratation des boues
JP2020093224A (ja) * 2018-12-13 2020-06-18 株式会社タクマ 回転ドラム型汚泥濃縮装置
JP2020093223A (ja) * 2018-12-13 2020-06-18 株式会社タクマ 回転ドラム型汚泥濃縮装置

Also Published As

Publication number Publication date
DK6392D0 (da) 1992-01-20
AU3448793A (en) 1993-08-03
DK6392A (da) 1993-07-21

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