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WO2002031273A1 - Procede de traitement d"un sol de dragage - Google Patents

Procede de traitement d"un sol de dragage Download PDF

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Publication number
WO2002031273A1
WO2002031273A1 PCT/FI2001/000883 FI0100883W WO0231273A1 WO 2002031273 A1 WO2002031273 A1 WO 2002031273A1 FI 0100883 W FI0100883 W FI 0100883W WO 0231273 A1 WO0231273 A1 WO 0231273A1
Authority
WO
WIPO (PCT)
Prior art keywords
dredged
water
lake
sediment
peat
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/FI2001/000883
Other languages
English (en)
Inventor
Minna Katriina Aarnio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU2002210584A priority Critical patent/AU2002210584A1/en
Publication of WO2002031273A1 publication Critical patent/WO2002031273A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/02—Stream regulation, e.g. breaking up subaqueous rock, cleaning the beds of waterways, directing the water flow
    • E02B3/023—Removing sediments
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F7/00—Equipment for conveying or separating excavated material
    • E02F7/005—Equipment for conveying or separating excavated material conveying material from the underwater bottom
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • 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 objective of the present invention is, in accordance with claim 1, a method for reconditioning especially a eutrophied lake or similar body of water, where waterlogged sediment is removed from the bed of the lake through dredging as known per se, in order to increase the depth of the lake.
  • the objective of the present invention is, furthermore, a method developed for the processing of waterlogged sediment containing organic material dredged from the bed of the lake, and the specific use of a twin-screw press intended mainly for agricultural use.
  • the water of lakes and similar bodies of water created by the Ice Age hosts a continuous biological cycle of flora and fauna; for example, the aquatic flora of the lake stores solar energy and converts nutrients in the water into organic material. Over time, as the flora dies, this material descends to the bed of the lake, forming a sediment that could be best described as peat, consisting largely of decomposing remains of flora. The decomposition of organic material continues in this sediment, releasing nutrients into the water. In low-nutrient lakes, this cycle remains largely in equilibrium; the sediment on the bed of the lake increases in thickness very slowly if at all.
  • lake eutrophication is a problem that can rapidly deteriorate the value of a body of water in terms of leisure use in particular. Since eutrophication is mostly due to human action, it is also typical that such a reduction of recreation value occur in locations where leisure use would be of the greatest benefit, i.e. near urban communities. It would thus be advantageous not only to cease feeding nutrients into such systems but also especially important to restore such lakes and ponds to leisure use instead of leaving them to become overgrown at an increasing rate.
  • Another reconditioning method includes artificial oxygenation of water in order to forcibly prevent anaerobic conditions from evolving in the bottom sediment .
  • Such a method requires constant expenditure of energy and does not solve the original problem, i.e. shallowness and surplus of nutrients.
  • the situation today is that the problem of eutrophication is acknowledged but there are no practical measures available to solve it.
  • the objective of this invention is to create a method for efficiently, economically and ecologically removing large volumes of bottom sediment from lakes and similar bodies of water.
  • the objective of the invention is to provide procedures that can be used near human habitation.
  • An additional objective is to create a method where the surplus nutrients, which are useful as such and would in fact become available near their potential end users, can be put to use as a substrate for plants.
  • the dredged organic material can be used to generate energy, as shown in an alternative embodiment of the present invention.
  • the above objectives can be achieved in the manner outlined in the enclosed claims and in accordance with the characteristics defined therein.
  • the reconditioning method according to the present invention is characterized by: combining the dredged material with an absorbent material, expecially with peat and mixing and compressing the resultant slurry so that the water in the dredged material is trapped in the cell structure of the absorbent material.
  • the dredged sediment processing method is characterized by: bringing the sediment material into contact with an absorbent material that has an absorbent cell structure, favorably with peat, bringing said sediment material and said peat into a mutual agitation and subjecting the resultant slurry to mechanical compression.
  • One embodiment of this invention includes the use of a twin-screw press intended mainly for agricultural use for the compression of the dredged material from the bottom sediment into the cell structure of the absorbent material, such as peat or the like.
  • Other benefits and characteristics of the present invention are disclosed in the enclosed dependent patent claims.
  • a body of water 1 such as a lake, pond or similar body of water contains water, whose surface is referred to as 2.
  • a bottom sediment 3 contains organic material derived from the biotope of the lake, such as flora, fish and micro-organisms .
  • the strata of the sediment are in various stages of decomposition: the deepest strata 3a are in an advanced state of mineralization, while the topmost strata 3b and 3c contain more recent organic material.
  • the topmost strata 3c of the bottom sediment 3 contain a large proportion of water, sometimes so much so that any boundary 4 between open water and bottom sediment is rather difficult to identify; the proportion of solid matter increases towards the bed 5 of the lake, as the darkening tone in the Figure depicts .
  • the Figure shows that large floating-leaf plants 6 such as yellow water-lilies grow with their leaves 7 very close to the surface 2, whereas their roots 8 are in the bottom sediment 3 at a level advantageous to the plant .
  • the Figure also shows minor aquatic plants 6a, whose roots form a sometimes very tough top layer to the bottom sediment 3.
  • a depth of two metres is often considered critical for the state of a lake in the sense that aquatic plants 6 usually cannot reach the surface from a depth of more than two metres, and thus cannot be under influence of the most effective solar radiation.
  • growing conditions in terms of both light and temperature are favourable for strong growth of aquatic plants, which in turn leads to an increase in biomass if nutrients are available.
  • the sediment zone to be removed 9 be dredged for instance using a suction dredger so as to remove the entire sediment stratum 3c.
  • the drawing shows, only schematically, an existing dredging system which may include, e.g., a pontoon 10 supporting an appropriately cutting suction head 11, whereby waterlogged dredged material 13 is removed from the body of water 1 by means of an arrangement known per se, e.g., a piping 12, for further processing.
  • Processing of the dredged material according to the present invention includes that the dredged material 13 is brought essentially as it is to be mixed with a porous absorbent material 14, especially with peat, so that the water and fine solids in the dredged material 13 are pressed into the cell structure of the absorbent material 14.
  • this phase is implemented using an existing screw press referred to by reference 15.
  • Said screw press 15 has a cooperating twin screw arrangement 16, which in connection with a mutua intermixing of said materials 13, 14 also subject the resultant slurry to a mutual compression. Through the compression, a considerable proportion of the dredged material 13 is forced into the cell structure of the absorbent material 14.
  • the dredged material 13 especially that from near the surface, usually contains less than 20 % of fine solids, in most cases ⁇ 2 to 15 % and typically 6 to 10 %.
  • These solids consist mainly of plant detritus, i.e. material akin to peat and as such similar to fully composted plant peat.
  • the chemical composition of the sediment 3, 3c includes organic carbon compounds as well as ordinary substances classified as fertilizers and trace elements such as phosphorus, nitrogen, potassium, sodium, calcium, magnesium, boron, copper, iron, etc.
  • the end product is a material excellently suited for use as a growth substrate for plants or as a raw material for such a substrate.
  • This type of material is in short supply in urban communities.
  • the material may also contain, due to external contamination, heavy metals and other harmful substances.
  • the presence of such substances is often local and well-defined, as disclosed in the Figure by reference 17, and thus it is appropriate to use sediment analysis to determine the zones and depths where the dredged material 13 or the mix material 18 produced through the compression process should be appropriately brought to further special treatment.
  • the compression process is regulated, at least in part, by adjusting the suction depth of the suction head 11 of the dredging apparatus, as shown with a dotted line in the drawing.
  • the water content of the sediment stratum 3 which may be 80 to >98 % of the total volume, contains a significant proportion of nutrients that need to be extracted from the body of water 1.
  • Peat has proven a particularly feasible absorbent material 14, because its vacant cell structure can receive water and fine solids to an amount which almost corresponds to the initial peat volume.
  • a suitable machine for the mixing and compression process is, e.g., a screw press used as such in agricultural manure processing 15.
  • This machine has parallel transporting screws 14 that mix material placed on the screws, in this case the dredged material 13 and the absorbent peat 14.
  • the dredged material 13 which is conveyed in appropriate manner by means of a pipe 12 is sprayed on top of a layer 20 of absorbent peat blown or otherwise conveyed from a peat silo 19.
  • additives to improve a particular desired feature of the end product 18 are added to the peat 14 and/or the dredged material 13 at this point in the process.
  • Such additives may, e.g., include bacteria that contribute to a further composting of the end product 18, possible additional nutrients to improve the nutrient balance of the end product, tensides, buffering materials such as lime, and/or some other appropriate additive 21.
  • the absorbent peat 14, 20, the dredged material 13 added to it and any additives 21 are mixed with one another, and at the same time the dredged material 13 with a high water content and any additives 21 are compressed into the cell structure of the peat 14.
  • the proportions of the materials being mixed depends on the properties of the dredged material 13; a typical mixture involves 1 part dredged material to 1 to 1.5 parts peat.
  • the mixture ratio and compression pressure are kept within such limits that essentially all of the dredged material 13, including the water it contains, is absorbed into the peat 14; thus, the nutrient-rich water is contained as a beneficial additive in the peat instead of flowing back into the body of water.
  • the parameters may be suitably adjusted by controlling the dredging power, the rotational speed of the screws 16 and/or the rate of adding peat to the process.
  • the water level 2 of the body of water 1 will also be regulated during the dredging with regard to the water removed from it with the dredged material 13, for instance by damming, as shown in the drawing at reference 22. Said dam 22 also prevents the nutrient-rich water, which may be temporarily clouded by the dredging, from progressing further in the watercourse.
  • the volume of the end product 18 is significantly smaller than the combined volume of the mixed materials 13, 14, since under pressure the cell structure of the peat 14 contains the water in the dredged material 13 very efficiently.
  • 1 part of dredging material 13 mixed with 1.5 parts of peat 14 yields only 1.5 parts of end product 18 after mixing and compression.
  • the end product 18 produced by means of the method according to the present invention contains all the nutrients required in a good substrate. Thus, if a dark, already composted peat is used as said absorbent peat 14, the end product 18 is usable as a substrate with no further processing at all.
  • the end product 18 is primarily suitable for energy production.
  • the absorbent peat 14 prevents also the unpleasant smells released by the decomposing dredging material 13 and renders the end product 18 hygienic, solid and easy to process and transport.
  • the present invention provides a number of significant benefits due to which the reconditioning even of large lakes becomes a feasible proposition. Firstly, the need for land areas to spread the dredging material to dry, and to smell in the process of decomposition, often for years, is eliminated, because the dredged material does not need to be dumped. Secondly, instead of the dredging producing mainly a problem waste, the dredged material is converted into a useful material of which there is in many cases a shortage especially in the immediate vicinity of eutrophied lakes. The process also eliminates the unpleasant olfactory effects of dredged material, and the end product is commercially viable. Furthermore, the end product is easy to handle, transport and process further.
  • the method according to the present invention is usable in the field, easy to implement and reliable. It recovers the greatest proportion of nutrients possible; even the nutrient-rich water involved is contained in th eproduct and will not be released back into the watercourse.
  • the technology involved in the method is existing, tested and easily available.
  • a further benefit to be noted is that even the dredging material 13 extracted from even very problematic locations 17 can easily be controlled, enabling harmful materials to be removed from the watercourse and preventing their spreading into the environment.
  • the method according to the present invention enables even lakes in an advanced state of eutrophication to be reconditioned into their natural state, and in any case increasing their water depth safely and without causing environmental problems. With the increase in depth and the removal of flora, the leisure use value of the lakes will increase.
  • the additives 21 discussed above may include a binding agent to render the end product 18 solid and malleable and thus usable for gardening and landscaping, so that the binding agent and/or the end product 18 itself also in a hardened state decomposes over time and/or forms a substrate by itself.
  • the binding agent 21 may also be such that the end product 18 in a shaped and more hardened form as discussed above is usable for other purposes, for instance as an essentially solid construction material or the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Ocean & Marine Engineering (AREA)
  • Treatment Of Sludge (AREA)

Abstract

La présente invention concerne un procédé permettant de remettre en état un lac eutrophisé (1). Selon le procédé décrit dans l"invention, un sédiment de fond saturé d"eau (3, 3a, 3b, 3c) du lac (1) est retiré de manière à augmenter la profondeur de l"eau. Dans ce procédé, un matériau dragué (13) et un matériau absorbant (14, 20) sont mélangés puis compressés, au moins une portion importante du matériau dragué (13) étant pressée par compression dans une structure alvéolaire du matériau absorbant (14, 20). La présente invention concerne également un procédé permettant de traiter un sédiment de fond saturé dragué contenant une matière organique, le matériau dragué (13) étant mis en contact avec un matériau absorbant (14, 20) présentant une structure alvéolaire absorbante, puis soumis à un mélange réciproque et à une compression mécanique (16). En outre, cette invention concerne l"utilisation d"une presse à deux vis (15, 16) permettant de compresser un matériau dragué (13) obtenu à partir d"un sédiment de fond (3, 3c, 9) d"un lac (1) dans une structure alvéolaire d"un matériau absorbant (14, 20), tel que de la tourbe.
PCT/FI2001/000883 2000-10-12 2001-10-11 Procede de traitement d"un sol de dragage Ceased WO2002031273A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002210584A AU2002210584A1 (en) 2000-10-12 2001-10-11 Method for treatment of dredging soil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20002247 2000-10-12
FI20002247A FI122359B (fi) 2000-10-12 2000-10-12 Menetelmä järven kunnostamiseksi, menetelmä sedimenttimassan käsittelemiseksi sekä kaksoisruuvipuristimen käyttö ruoppausjätteen käsittelemiseksi

Publications (1)

Publication Number Publication Date
WO2002031273A1 true WO2002031273A1 (fr) 2002-04-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2001/000883 Ceased WO2002031273A1 (fr) 2000-10-12 2001-10-11 Procede de traitement d"un sol de dragage

Country Status (3)

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AU (1) AU2002210584A1 (fr)
FI (1) FI122359B (fr)
WO (1) WO2002031273A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010140874A1 (fr) * 2009-06-02 2010-12-09 Vladimir Dementjev Produit améliorant des caractéristiques des sols
NL2004556C2 (en) * 2010-04-15 2011-10-18 Mfde B V Method for inhibiting and/or preventing the growth of algae in a lake or shallow water.
CN102936908A (zh) * 2011-08-15 2013-02-20 中交上海航道勘察设计研究院有限公司 一种环保疏浚方法
WO2016142465A3 (fr) * 2015-03-10 2016-11-03 Uwe Werner Procédé pour préparer des substances concentrées, liquides ou pâteuses à partir de matières premières de diverses origines, à plusieurs constituants, contenant une substance humique
CN107989101A (zh) * 2017-11-14 2018-05-04 中电建水环境治理技术有限公司 河湖及湿地整体移植的保护性生态清淤方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2808489A1 (de) * 1973-10-15 1979-08-30 Manchak Jun Verfahren und einrichtung zur umwandlung von insbesondere schlamm in ein festes, brechbares und im wesentlichen geruchfreies reaktionsprodukt
JPS58101798A (ja) * 1981-11-16 1983-06-17 Hitachi Metals Ltd 泥状物質の脱水方法
DE4110950A1 (de) * 1991-04-05 1992-10-08 Zge Duengestoffe Gross Kreutz Verfahren zur aufarbeitung von gewaessersedimenten
JPH06142699A (ja) * 1992-11-10 1994-05-24 Chiyoda Corp ヘドロの早期土壌化方法
JPH0810799A (ja) * 1994-07-05 1996-01-16 Ryoichi Wako 汚泥の繊維による処理方法とその複合固形物
JPH11207400A (ja) * 1998-01-28 1999-08-03 Tamuraya:Kk 汚泥の処理方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2808489A1 (de) * 1973-10-15 1979-08-30 Manchak Jun Verfahren und einrichtung zur umwandlung von insbesondere schlamm in ein festes, brechbares und im wesentlichen geruchfreies reaktionsprodukt
JPS58101798A (ja) * 1981-11-16 1983-06-17 Hitachi Metals Ltd 泥状物質の脱水方法
DE4110950A1 (de) * 1991-04-05 1992-10-08 Zge Duengestoffe Gross Kreutz Verfahren zur aufarbeitung von gewaessersedimenten
JPH06142699A (ja) * 1992-11-10 1994-05-24 Chiyoda Corp ヘドロの早期土壌化方法
JPH0810799A (ja) * 1994-07-05 1996-01-16 Ryoichi Wako 汚泥の繊維による処理方法とその複合固形物
JPH11207400A (ja) * 1998-01-28 1999-08-03 Tamuraya:Kk 汚泥の処理方法

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 8330, Derwent World Patents Index; AN 1983-719775 *
DATABASE WPI Week 9425, Derwent World Patents Index; AN 1994-205364 *
PATENT ABSTRACTS OF JAPAN *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010140874A1 (fr) * 2009-06-02 2010-12-09 Vladimir Dementjev Produit améliorant des caractéristiques des sols
NL2004556C2 (en) * 2010-04-15 2011-10-18 Mfde B V Method for inhibiting and/or preventing the growth of algae in a lake or shallow water.
CN102936908A (zh) * 2011-08-15 2013-02-20 中交上海航道勘察设计研究院有限公司 一种环保疏浚方法
WO2016142465A3 (fr) * 2015-03-10 2016-11-03 Uwe Werner Procédé pour préparer des substances concentrées, liquides ou pâteuses à partir de matières premières de diverses origines, à plusieurs constituants, contenant une substance humique
CN107989101A (zh) * 2017-11-14 2018-05-04 中电建水环境治理技术有限公司 河湖及湿地整体移植的保护性生态清淤方法

Also Published As

Publication number Publication date
FI122359B (fi) 2011-12-30
FI20002247L (fi) 2002-04-13
AU2002210584A1 (en) 2002-04-22
FI20002247A0 (fi) 2000-10-12

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