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WO1994001369A1 - Procede d'egouttage de boues - Google Patents

Procede d'egouttage de boues Download PDF

Info

Publication number
WO1994001369A1
WO1994001369A1 PCT/FI1993/000283 FI9300283W WO9401369A1 WO 1994001369 A1 WO1994001369 A1 WO 1994001369A1 FI 9300283 W FI9300283 W FI 9300283W WO 9401369 A1 WO9401369 A1 WO 9401369A1
Authority
WO
WIPO (PCT)
Prior art keywords
peat
sludge
dry substance
accordance
mixed
Prior art date
Application number
PCT/FI1993/000283
Other languages
English (en)
Inventor
Osmo Nenonen
Original Assignee
Osmo Nenonen
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 Osmo Nenonen filed Critical Osmo Nenonen
Publication of WO1994001369A1 publication Critical patent/WO1994001369A1/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
    • C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
    • 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 for dewatering sludge, in which method the sludge is mixed with peat, the dry substances being calculated as 20 - 150 % and after which the mixture is compressed mechanically to separate the water component from it.
  • the invention is particularly related to the treatment of sewage cleaning plant sludge, but is also applicable to e.g. the treatment of forest product industry fibre sludges.
  • Patent Claim 895032 a method of mixing peat and sludge is presented, by means of which a mass substance is produced that does not load the environment so severely.. In it, however, the consumption of peat is very great, typically 1,6 times the amount of sludge. This means 300 - 1000 % peat dry substances in relation to the sludge dry substances. Decomposition of the sludge is also not a final solution, because the decomposed sludge still demands a drying agent, which increases the mass to be dealt with. In Finnish Patent 51338 presents the production of useful soil using decomposed sludge. Its dry substances content should be more than 10 %.
  • the sludge is mixed with sand material and possibly peat, and the resulting mixture is subjected to compression.
  • the sludge is squeezed through a peat filter, the filter material obtained being used for soil improvement. Excess moisture is squeezed out of the saturated filter material.
  • US publication 4,659,472 presents a treatment method for sludge obtained from a sewage purification plant, by means of which a compostable mixture is obtained.
  • Sawdust, finely milled peat or bark, and flocculants are thoroughly mixed into the sludge, after which the mixture is compressed by means of a belt press to separate the water from it. After this the mixture is taken to composting vessels.
  • French patent publication no. 2 497 790 also presents a method for improving the drying of the sludge.
  • sawdust, peat, straw, or other similar organic materials are mixed with the sludge before mechanical filtering. These prevent the mechanical filter used from becoming clogged.
  • an opening size of 100 microns is typically used. The method is slow.
  • the intention of the invention is to create a simpler method than previously for removing water from sludge in such a way that the amount of mass substance requiring further treatment really does diminish.
  • the intention of the invention is also a simple method of operating a composting reactor.
  • the characteristic features of the method in accordance with the invention are presented in the accompanying Patent Claims.
  • the mixing should take place gently, so that the cellular structure of the peat is not broken.
  • the peat here especially rough surface peat, has many functions. It acts as an internal filter, increases friction in the screw press, and provides a suitable amount of carbon for composting.
  • the operation of the invention is based on the fact that the fibres of the sludge partly penetrate the cellular structure of the peat, when it is possible to separate the water from them by means of pressure. In other words, the compression resistance of the peat is raised by this means. At the present moment it seems that the compression in accordance with the invention cannot be achieved with any other device than a screw press.
  • the peat dry substance is 35 - 65 % of the sludge dry substance.
  • the dosing is from 20 % to 150 %.
  • the dosing also depends on the quality of the sludge. For example, forest product industry fibre sludges may require different dosing to purification plant sewage sludges.
  • the amount (vol) of peat is in the region of 1 - 100 % of the amount of sludge (vol) .
  • Figure 1 shows the sludge drying process
  • Figure 2 shows the construction of the internal jacket of the screw press in detail
  • the sludge to be treated is led from the input pipe 1 to the mixing tank 3 , into which a suitable amount of rough surface peat, for example sphagnum moss, is dosed from silo 2.
  • a suitable amount of rough surface peat for example sphagnum moss
  • the dry substance content of the peat should be between 50 - 120, most advantageously 50 - 80 kg/m 3 .
  • the peat should be only slightly decomposed.
  • the amount of peat also depends on further treatment.
  • the nitrogen - carbon ratio required for composting is adjusted at each time correctly for the amount of peat, which is the source of carbon.
  • the mixed mixture is led through throttle valve 16 to the feed hopper 18 of press 6.
  • flocculants i.e. polyelectrolytes are added to the mixture through connection 17 immediately after the throttle valve 16.
  • the dry substance content is no longer raised, instead the intention is to clarify the filtrate.
  • the mixture is further mixed by means of a slowly rotating screw coil 19. From here the mixture is led to a suitable screw press. By means of this a high pressure and non- clogging operation is achieved.
  • a screw press it is possible to use e.g. the model "Tasster FA”, manufactured by the French firm Neyrtec, which is shown schematically in the figure by the reference number 6.
  • Figure 2 shows an advantageous construction for the internal jacket. It consists in an axial direction of elongated components 13, between which grooves 14 are left. The edge 15 of the wings of the screw 7 pushes new peat mass along the grooves 14 and changes the mass in the grooves, filtration continuing effectively.
  • the final product obtained is a firm, soil-like mass that only smells slightly, the further treatment of which is easy, no matter whether it takes place by combustion, composting, or in another manner.
  • a flocculant With the aid of a flocculant the water component obtained is clearer, with a dry substance content of only 0,01 - 0, 2 %.
  • the amount of peat must be increased slightly to increase friction. It is possible to put the water component back into circulation at a purification plant. Without a flocculant the dry substance content at this point rises to about 1 %.
  • the compression is advantageously between 2 - 10 bar.
  • the dry substance content may rise at times to between 45 - 50 %, possibly even higher. In reactor composting a 30 % dry substance content is sufficient, nor is further drying necessary.
  • the sludge can be pretreated either biologically or decomposed. As such, the method can be also be used for other than organic sludges.

Landscapes

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

Abstract

L'invention se rapporte à un procédé d'égouttage de boues, ce procédé consistant à mélanger de la tourbe à la boue afin d'en porter la teneur en matières sèches à un niveau compris entre 20 et 150 %, après quoi le mélange est mécaniquement comprimé pour en séparer le constituant aqueux. Selon l'invention, la tourbe est mélangée avec précaution afin de ne pas en briser la structure. La compression est effectuée par l'intermédiaire d'une presse à vis à fonctionnement continu dans laquelle se trouve une chemise de filtration interne. La teneur en matières sèches de la tourbe à mélanger est comprise entre 50 et 120 kg/m3, de préférence entre 50 et 80 kg/m3.
PCT/FI1993/000283 1992-07-08 1993-07-02 Procede d'egouttage de boues WO1994001369A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI923134A FI101292B (fi) 1992-07-08 1992-07-08 Menetelmä veden poistamiseksi biologisesti käsitellystä puhdistamoliet teestä
FI923134 1992-07-08

Publications (1)

Publication Number Publication Date
WO1994001369A1 true WO1994001369A1 (fr) 1994-01-20

Family

ID=8535588

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1993/000283 WO1994001369A1 (fr) 1992-07-08 1993-07-02 Procede d'egouttage de boues

Country Status (2)

Country Link
FI (1) FI101292B (fr)
WO (1) WO1994001369A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996007620A1 (fr) * 1994-09-06 1996-03-14 Vapo Oy Procede et dispositif servant a secher des boues
WO1997001513A1 (fr) * 1995-06-26 1997-01-16 Esko Torkkeli Procede pour traiter une boue residuaire
WO2000058229A1 (fr) * 1999-03-29 2000-10-05 Etor Oy Technique de traitement et d'utilisation de boues
WO2001028939A1 (fr) * 1999-10-22 2001-04-26 Sphagnum As Procede de deshydratation de boues
WO2009019609A3 (fr) * 2007-07-03 2009-04-09 Dominick O'reilly Système amélioré de traitement des déchets
US8196311B2 (en) 2008-10-22 2012-06-12 Hydrocell Technologies Waste treatment system
CN111777315A (zh) * 2020-07-14 2020-10-16 张磊 一种污泥干化处理系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2747130A1 (de) * 1976-10-21 1978-04-27 Waste Eng Syst Co Oy Anlage zur herstellung eines bodenverbesserungsmittels
US4659472A (en) * 1984-01-04 1987-04-21 Purac Ab Method for producing a compostable mixture of sludge from sewage purification plants
SE468048B (sv) * 1988-10-25 1992-10-26 Vapo Oy Foerfarande och blandare foer blandning av torv och slam till homogen massa

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2747130A1 (de) * 1976-10-21 1978-04-27 Waste Eng Syst Co Oy Anlage zur herstellung eines bodenverbesserungsmittels
US4659472A (en) * 1984-01-04 1987-04-21 Purac Ab Method for producing a compostable mixture of sludge from sewage purification plants
SE468048B (sv) * 1988-10-25 1992-10-26 Vapo Oy Foerfarande och blandare foer blandning av torv och slam till homogen massa

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996007620A1 (fr) * 1994-09-06 1996-03-14 Vapo Oy Procede et dispositif servant a secher des boues
WO1997001513A1 (fr) * 1995-06-26 1997-01-16 Esko Torkkeli Procede pour traiter une boue residuaire
RU2136615C1 (ru) * 1995-06-26 1999-09-10 Торккели Эско Способ переработки жидких отходов
US5972058A (en) * 1995-06-26 1999-10-26 Torkkeli; Esko Ilmari Method of treating waste sludge
WO2000058229A1 (fr) * 1999-03-29 2000-10-05 Etor Oy Technique de traitement et d'utilisation de boues
US6837999B1 (en) 1999-10-22 2005-01-04 Sphagnum As Process for dewatering of sludge
WO2001028939A1 (fr) * 1999-10-22 2001-04-26 Sphagnum As Procede de deshydratation de boues
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
US8196311B2 (en) 2008-10-22 2012-06-12 Hydrocell Technologies Waste treatment system
CN111777315A (zh) * 2020-07-14 2020-10-16 张磊 一种污泥干化处理系统
CN111777315B (zh) * 2020-07-14 2021-02-02 深圳市深水水务咨询有限公司 一种污泥干化处理系统

Also Published As

Publication number Publication date
FI923134L (fi) 1994-01-09
FI101292B1 (fi) 1998-05-29
FI101292B (fi) 1998-05-29
FI923134A0 (fi) 1992-07-08

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