WO2005108314A1 - Procede de deshydratation de suspensions - Google Patents

Procede de deshydratation de suspensions Download PDF

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Publication number
WO2005108314A1
WO2005108314A1 PCT/SE2005/000667 SE2005000667W WO2005108314A1 WO 2005108314 A1 WO2005108314 A1 WO 2005108314A1 SE 2005000667 W SE2005000667 W SE 2005000667W WO 2005108314 A1 WO2005108314 A1 WO 2005108314A1
Authority
WO
WIPO (PCT)
Prior art keywords
dewatering
comprised
procedure according
promoting agent
sludge
Prior art date
Application number
PCT/SE2005/000667
Other languages
English (en)
Inventor
Arne Lindahl
Original Assignee
Arne Lindahl
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 Arne Lindahl filed Critical Arne Lindahl
Priority to JP2007513103A priority Critical patent/JP2007536084A/ja
Publication of WO2005108314A1 publication Critical patent/WO2005108314A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • 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

Definitions

  • This invention relates to a procedure concerning dewatering of suspensions, in particular, suspensions with a relatively low concentration of organic matter.
  • the dewatering is performed with the aid of known dewatering apparatus. Simultaneously as thickening occurs the suspension is mixed with materials that are able to increase the dry solid content.
  • Patent SE 9704653-6 recommends the addition of sawdust and bark with the intention to "crush” cells, to form channels and to "reinforce” the sludge.
  • Swedish patent 0200217-8 a procedure is described which results in high solid contents by mechanical dewatering. By aid of this procedure dry content levels in sludge exceed 50 %.
  • the material is mixed with one or more additives in particle form in which the content of fine materials, defined by their passing a pulp strainer (screen) with a diameter of 2 mm or corresponding screen width, achieves at least 40 weight-% of the total weight of additives.
  • a drawback with many apparatuses are that they expose the material to a substantial compression, which can damage the material and parts of the machine equipment.
  • high levels of mechanical pressure damage wires, press felts and the like. Increasing wear and tear can result in breakage of the wire or felt. Press rolls can also be damaged.
  • more energy is required for each increase in the working pressure.
  • a higher energy consumption results in a negative effect on the natural environment, because electrical energy is usually needed, which in turn is generated through the combustion of fossil fuels and the like, which among other things results in carbon dioxide emissions.
  • the suspension, to be dewatered is mixed together with a solid matter (henceforth named agent) in particle form.
  • agents are comprised of polymers and the like, for example polyurethane with low density or with a volume density much lower than 1 kg/dm .
  • Polyurethane is a composite of carbamide acid esters (general formula RO.CO.NH ). This type of ethyl ester is usually named urethane, and such urethane can be recycled from used insulation from for example old freezers and refrigerators.
  • regenerated cellulose cellulose acetate silk, "WETTEX-foam”
  • sawdust sawdust
  • starch straw plants as for example reed-canary grass and straw
  • the agent must be shredded and ground to relatively small particles, if possible before sifting by means of separating (straining) for concentration of the agent's fine particles.
  • the desired particle size of the agent is best achieved through straining in one or more stages.
  • straining devices can be used, as for example a shaking sieve, a vibration sieve or a so called air separator.
  • the agents weight ratio can vary within a large interval. From an economical point of view however the lowest possible ratio of agent is preferable. However to achieve an effect a weight ratio of at least 5 % and preferably more then 10 weight-% is required. In some cases it can be advantageous to produce briquettes, granulates or pellets after thickening. Here, the method that is used in patent SE 9904313-5 among others can be utilised.
  • An essential and distinguishing feature of the invention is that the mixing of the above described agents occurs in an integrated step at the same time as thickening occurs.
  • This refers to the thickening of liquids, which have a relatively low concentration content of matter, as for example sludge.
  • the aim is to thicken suspensions with concentrations of solid matter, which lie between 0.5 % and 15 %.
  • the integrated combination of the mixing and the thickening procedures can be carried out by using known devices.
  • the screw water extractor with a core or a water extractor without a core which transfers liquid and matter with the aid of a spiral
  • a tube surrounds the screw or the spiral with openings on its envelope surface.
  • the envelope surface's outside or inside can be covered with a wire of plastic or steel.
  • Further alternatives constitute dewatering devices with rotating paddles or pins connected to a central axel.
  • Sludge containing fibres in suspension form from a paper mill's biological refining treatment was transferred, as in the example with prior art, to a screw water extractor whose envelope surface had holes with a diameter of 0.2 mm.
  • sawdust was added from a sawmill.
  • the sawdust was a separation of strained sawdust.
  • the strained sawdust had a weight ratio of 64 % fine screening, which per definition passed a sieve with a hole diameter of 2 mm.
  • the sawdust had a dry content of 43 %.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Treatment Of Sludge (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

La présente invention concerne un procédé de déshydratation de suspensions, notamment, de suspensions possédant une concentration relativement basse de matière organique et une concentration en matières sèches inférieure à 15 %. Une caractéristique de distinction de cette invention repose sur le fait que des agents favorisant la déshydratation sont mélangés simultanément avec la suspension, à mesure que l'épaississement se produit. Parmi des exemples de matières qui accroissent la concentration de matière organique, sont répertoriées la sciure de bois, les matières synthétiques qui, de préférence, contiennent du polyuréthanne pulvérulent, de la tourbe broyée ou encore de l'écorce broyée. La proportion pondérale des additifs s'élève à au moins 5 % en poids et, de préférence, à au moins 10 % en poids du poids total de la matière organique. La déshydratation et le mélange simultanés sont réalisés à l'aide de systèmes de déshydratation connus. Un exemple est celui de la vis d'extraction d'eau. Après la déshydratation partielle, la matière est transférée à une presse en vue d'une déshydratation complémentaire des contenus d'extraits secs supérieurs à 45 %.
PCT/SE2005/000667 2004-05-10 2005-05-08 Procede de deshydratation de suspensions WO2005108314A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007513103A JP2007536084A (ja) 2004-05-10 2005-05-08 サスペンションの脱水方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0401234-0 2004-05-10
SE0401234A SE527884C2 (sv) 2004-05-10 2004-05-10 Förfarande för vätskeutdrivning från suspensioner

Publications (1)

Publication Number Publication Date
WO2005108314A1 true WO2005108314A1 (fr) 2005-11-17

Family

ID=32390935

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2005/000667 WO2005108314A1 (fr) 2004-05-10 2005-05-08 Procede de deshydratation de suspensions

Country Status (5)

Country Link
JP (1) JP2007536084A (fr)
CN (1) CN1980865A (fr)
RU (1) RU2006142558A (fr)
SE (1) SE527884C2 (fr)
WO (1) WO2005108314A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2746232A1 (fr) 2012-12-19 2014-06-25 Messer Austria GmbH Procédé de drainage de boues résiduaires
WO2017219131A1 (fr) * 2016-06-23 2017-12-28 Fpinnovations Amélioration de la déshydratation de boues biosolides à l'aide d'un acide et de matières lignocellulosiques
SE543633C2 (en) * 2020-03-25 2021-04-27 Valmet Oy Method for utilizing sludges from wood pulping

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105384322A (zh) * 2015-07-02 2016-03-09 江苏鑫中恒水工业装备有限公司 一种污泥干化及污水处理的方法
CN109574446A (zh) * 2018-12-14 2019-04-05 上海交通大学 一种利用臭氧/混凝剂/疏水性聚氨酯改善污泥脱水性能的方法
CN111499148B (zh) * 2020-05-13 2021-01-29 扬州纪扬机械设备有限公司 一种用于淤泥污水分离的设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60147299A (ja) * 1984-01-09 1985-08-03 Ebara Infilco Co Ltd 汚泥等の脱水方法及びその装置
US4595506A (en) * 1978-07-17 1986-06-17 Gebruder Weiss K.G. Filtering aid for the treatment of suspensions, particularly of domestic, industrial, and other sludges for subsequent draining
SE523787C2 (sv) * 2002-01-23 2004-05-18 Arne Lindahl Förfarande för dränering av vätska från svåravvattnade material
JP2018032707A (ja) * 2016-08-24 2018-03-01 トヨタ自動車株式会社 リアクトル用のコイルを形成する平角線

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595506A (en) * 1978-07-17 1986-06-17 Gebruder Weiss K.G. Filtering aid for the treatment of suspensions, particularly of domestic, industrial, and other sludges for subsequent draining
JPS60147299A (ja) * 1984-01-09 1985-08-03 Ebara Infilco Co Ltd 汚泥等の脱水方法及びその装置
SE523787C2 (sv) * 2002-01-23 2004-05-18 Arne Lindahl Förfarande för dränering av vätska från svåravvattnade material
JP2018032707A (ja) * 2016-08-24 2018-03-01 トヨタ自動車株式会社 リアクトル用のコイルを形成する平角線

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 309 (C - 318) 5 December 1985 (1985-12-05) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 163 (C - 0826) 24 April 1991 (1991-04-24) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2746232A1 (fr) 2012-12-19 2014-06-25 Messer Austria GmbH Procédé de drainage de boues résiduaires
DE102012024888A1 (de) 2012-12-19 2014-06-26 Institut za okoljevarstvo in senzorje, d.o.o. Verfahren und Vorrichtung zum Entwässern von Abfallschlamm
WO2017219131A1 (fr) * 2016-06-23 2017-12-28 Fpinnovations Amélioration de la déshydratation de boues biosolides à l'aide d'un acide et de matières lignocellulosiques
SE543633C2 (en) * 2020-03-25 2021-04-27 Valmet Oy Method for utilizing sludges from wood pulping
SE2050328A1 (en) * 2020-03-25 2021-04-27 Valmet Oy Method for utilizing sludges from wood pulping
WO2021194403A1 (fr) * 2020-03-25 2021-09-30 Valmet Ab Procédé d'utilisation des boues provenant de la fabrication de la pâte de bois

Also Published As

Publication number Publication date
CN1980865A (zh) 2007-06-13
SE527884C2 (sv) 2006-07-04
SE0401234L (sv) 2005-11-11
JP2007536084A (ja) 2007-12-13
SE0401234D0 (sv) 2004-05-10
RU2006142558A (ru) 2008-06-20

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