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WO1996007620A1 - Procede et dispositif servant a secher des boues - Google Patents

Procede et dispositif servant a secher des boues Download PDF

Info

Publication number
WO1996007620A1
WO1996007620A1 PCT/FI1995/000473 FI9500473W WO9607620A1 WO 1996007620 A1 WO1996007620 A1 WO 1996007620A1 FI 9500473 W FI9500473 W FI 9500473W WO 9607620 A1 WO9607620 A1 WO 9607620A1
Authority
WO
WIPO (PCT)
Prior art keywords
sludge
peat
centrifuge
accordance
mixing
Prior art date
Application number
PCT/FI1995/000473
Other languages
English (en)
Inventor
Arto RYHÄNEN
Original Assignee
Vapo Oy
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 Vapo Oy filed Critical Vapo Oy
Publication of WO1996007620A1 publication Critical patent/WO1996007620A1/fr

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/38Treatment of water, waste water, or sewage by centrifugal separation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/147Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
    • CCHEMISTRY; METALLURGY
    • C05FERTILISERS; MANUFACTURE THEREOF
    • C05FORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F7/00Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses

Definitions

  • the object of the invention is a method and equipment for drying sludge, in which method the sludge is mixed with a flocculant and the mixture obtained is treated in a centrifuge, in order to separate the water component from the solid substance.
  • the intention of this invention is to create a new kind of method and equipment, by means of which the centrifuge treatment can be considerably improved over previous ones.
  • the charac ⁇ teristic features of the method in accordance with the invention is presented in the accompanying Patent Claim 1 and the charac ⁇ teristic features of corresponding equipment are presented in Patent Claim 7.
  • the invention is based on the surprising obser ⁇ vation that small additions of peat to the sludge before centri- fuging improve the separation result considerably.
  • the manner of the influence of the peat is not precisely known at this stage.
  • the water component does not directly travel through the quan ⁇ tity of peat, so that the manner of operation is different to that in, for example, a peat filter. It seems to be that a small quantity of peat solidifies the solids mass in the sludge, which makes possible an improved separation result.
  • a centrifuge model SKZSNH S530L4 which has a capacity of 8 - 25 m 3 sludge per hour and is manufactured by the German Maschinen- fabrik Sangerhausen Gmbh, is advantageously used as the centri- fuge 1.
  • the solids content of the sludge is between 0,5 - 10 %.
  • the flocculant is dosed with the aid of dosing tank 7 and is pumped to the centrifuge feed pipe by means of dosing pump 8.
  • a clear water component 5 and a noticeably dry solid substance 6 are obtained from the centrifuge 1.
  • the solids content of the final product has been as much as 36 %, which can probably be further improved. Without the addition of peat, the solids content of the final product in tests was only 30 %.
  • the purity of the reject water in par ⁇ ticular has been improved with the aid of flocculation.
  • the reject water obtained is generally clear.
  • the peat is dosed as 10 - 20 % of the solids of the sludge.
  • the normal moisture content of peat is 50 % ⁇ 5 %.
  • the speed of revolution of the centrifuge used can be steplessly adjusted up to 3000 rpm.
  • a speed of revolution of 200 rpm was used, which gives a circumferential velocity of 55 m/s with a rotor diameter of 530 mm.
  • the circumferential velocity is less than 70 m/s, when the structure of the peat does not break down too early in the centrifuge treatment.
  • intermediate grade peat is used, i.e. it is slightly decomposed. If, on the other hand, the final product is to be burned, fuel peat, which is highly decomposed and has a moisture content of about 45 %, is used.
  • the mixing that takes place in the mixing tank 2 is so gentle that the peat would rise to the surface, if the mixture was allowed to stand.
  • the mixture, which is subject to continual mixing, is, however, led as such to the pipe, and the mixture is not given time to stand before the centrifuge treatment.

Landscapes

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

Abstract

L'invention concerne un procédé et un dispositif servant à sécher des boues. Ce procédé consiste à mélanger un agent de floculation avec la boue et à traiter le mélange obtenu dans une centrifugeuse afin de séparer l'eau de la substance solide. On mélange légèrement de la tourbe à la boue, en une proportion de 10 à 30 % de la substance solide de la boue, préalablement au traitement en centrifugeuse.
PCT/FI1995/000473 1994-09-06 1995-09-06 Procede et dispositif servant a secher des boues WO1996007620A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI944083A FI944083A7 (fi) 1994-09-06 1994-09-06 Menetelmä ja laitteisto lietteen kuivaamiseksi
FI944083 1994-09-06

Publications (1)

Publication Number Publication Date
WO1996007620A1 true WO1996007620A1 (fr) 1996-03-14

Family

ID=8541305

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1995/000473 WO1996007620A1 (fr) 1994-09-06 1995-09-06 Procede et dispositif servant a secher des boues

Country Status (2)

Country Link
FI (1) FI944083A7 (fr)
WO (1) WO1996007620A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2136615C1 (ru) * 1995-06-26 1999-09-10 Торккели Эско Способ переработки жидких отходов
WO2009019609A3 (fr) * 2007-07-03 2009-04-09 Dominick O'reilly Système amélioré de traitement des déchets
CN102302974A (zh) * 2011-06-14 2012-01-04 重庆大学 一种适用于去除污水处理厂活性污泥中淤沙的分离器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1965734A1 (de) * 1969-12-31 1971-07-08 Degussa Verfahren zur Klaerschlamm-Entwaesserung
CH679998A5 (fr) * 1989-05-09 1992-05-29 Bct Ag
WO1994001369A1 (fr) * 1992-07-08 1994-01-20 Osmo Nenonen Procede d'egouttage de boues

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1965734A1 (de) * 1969-12-31 1971-07-08 Degussa Verfahren zur Klaerschlamm-Entwaesserung
CH679998A5 (fr) * 1989-05-09 1992-05-29 Bct Ag
WO1994001369A1 (fr) * 1992-07-08 1994-01-20 Osmo Nenonen Procede d'egouttage de boues

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2136615C1 (ru) * 1995-06-26 1999-09-10 Торккели Эско Способ переработки жидких отходов
WO2009019609A3 (fr) * 2007-07-03 2009-04-09 Dominick O'reilly Système amélioré de traitement des déchets
GB2463628A (en) * 2007-07-03 2010-03-24 Dominick O'reilly An improved waste treatment system
GB2463628B (en) * 2007-07-03 2013-04-24 Hydropress Holdings Inc An improved waste treatment system
CN102302974A (zh) * 2011-06-14 2012-01-04 重庆大学 一种适用于去除污水处理厂活性污泥中淤沙的分离器

Also Published As

Publication number Publication date
FI944083L (fi) 1996-03-07
FI944083A7 (fi) 1996-03-07
FI944083A0 (fi) 1994-09-06

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