WO1996007620A1 - Procede et dispositif servant a secher des boues - Google Patents
Procede et dispositif servant a secher des boues Download PDFInfo
- 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
Links
Classifications
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers 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.
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)
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)
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 |
-
1994
- 1994-09-06 FI FI944083A patent/FI944083A7/fi not_active Application Discontinuation
-
1995
- 1995-09-06 WO PCT/FI1995/000473 patent/WO1996007620A1/fr active Application Filing
Patent Citations (3)
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)
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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