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WO2000062949A1 - Traitement de substrats pollues ou contamines - Google Patents

Traitement de substrats pollues ou contamines Download PDF

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Publication number
WO2000062949A1
WO2000062949A1 PCT/GB2000/001480 GB0001480W WO0062949A1 WO 2000062949 A1 WO2000062949 A1 WO 2000062949A1 GB 0001480 W GB0001480 W GB 0001480W WO 0062949 A1 WO0062949 A1 WO 0062949A1
Authority
WO
WIPO (PCT)
Prior art keywords
solution
silicic acid
substrate
treatment
moles
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/GB2000/001480
Other languages
English (en)
Inventor
James Donald Hillcoat
Clive John Hillcoat
Mark James Hillcoat
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.)
UPPERFORCE Ltd
Original Assignee
UPPERFORCE Ltd
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 UPPERFORCE Ltd filed Critical UPPERFORCE Ltd
Publication of WO2000062949A1 publication Critical patent/WO2000062949A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment

Definitions

  • This invention relates to the treatment of substrates contaminated or polluted by leachates derived from industrial wastes or residues. Such substrates are commonly found in "brown field” sites, particularly those where industry has previously been active.
  • Pollution or contamination is commonly caused by spillage of raw materials or bi-products into the ground or lagoons.
  • Typical residues are the metal salts of arsenic, cyanide, chromium (in various forms) , potassium, lead, cadmium and zinc, and many sulphates and chlorides which can be particularly damaging.
  • These metal salts together with rainfall and carbonic acids occurring naturally in soil produce solutions which become toxic leachates.
  • Such leachates percolate through the ground and may enter water courses and can contaminate land over much greater areas than those of original sites where the contamination originated.
  • a method of treating a polluted or contaminated substrate comprising creating a plurality of treatment columns in the substrate, each treatment column having the form of a permeable matrix bearing a silicic acid composition and a solution of an alkaline metal salt: the size, location and spacing of the columns being selected such that leachates in the substrate contact a matrix in their natural migration through the substrate.
  • the invention effectively provides reservoirs of silicic acid positioned in the path of leachates in their natural migration through the substrate.
  • a treatment column will have a diameter in the range of 200 to 500mm with a preferred minimum diameter being around 300mm. While the columns can be of considerable depth, this will not normally exceed 16m. They can be set at a wide variety of spacings, typically from as close as 0.5m to 5m. The columns would normally be created in a vertical orientation, but they could be inclined. This enables them to extend beneath existing building structures without or with minimal interference in their foundations.
  • the respective treatment columns can be created in a number of ways.
  • One preferred technique uses the material of the substrate itself, fractured to form the permeable matrix.
  • a pilot hole is first drilled for each column, and compressed air then delivered to the pilot hole to fracture the substrate therearound.
  • a hydro fracture treatment may be employed using water under pressure. The treatment materials can then be delivered to the pilot hole, whence they dissipate into the permeable matrix comprising the fractured substrate to form the treatment column.
  • a hole for the entire treatment column is excavated and filled with a neutral material to form the matrix.
  • the treatment materials are either mixed with the matrix material before filling or applied thereafter and remain captivated in the matrix.
  • Typical neutral materials are sand, mica, starch, cellulose or waste paper bi-products, polystyrene grains or granules, or mixtures thereof.
  • limewater preferably under pressure.
  • the reaction of silicic acid with the contaminant metals requires a pH of >6.5 and most brown field sites tend to be more acidic.
  • Pumping limewater or other alkaline metal salt solution under pressure into the drill hole will flood an area beyond the drill altering the pH of the substrate.
  • the introduction of limewater or other alkaline metal salt solution in this manner can form part of a deliberate hydrofracture technique to form a permeable matrix in the substrate itself.
  • silicic acid solution may be pumped into the drill hole/excavation hole to react with the limewater and contaminant metal salts to convert the latter to stable insoluble silicate form.
  • the silicic acid solution may be in the form of a modified silicic acid solution as disclosed in EP-A-0902077.
  • a modified alkali silicic acid generally has a Me 2 Oi : Si 0 2 ratio of 1 : 2 or 1 : 3.
  • Me 2 0 for the oxide part of the solution Me is a metal selected from lithium, sodium and potassium. The latter is preferred in the mixture with sodium.
  • a typical composition as disclosed in EP-A-09020777 would contain a 20kg of solution:
  • concentration levels of the order of 1% have been equally effective and in other tests the efficacity against many metal contaminants is retained at concentrations of as low as 0.10% While we cannot sure of the reason for this, it is believed that the more dilute solutions permeate through the substrate more effectively than the higher concentrations .
  • the present invention applies the technique more generally using the material of the substrate itself as the permeable matrix. Particularly with the low concentrations of a silicic acid in the solution, it appears that the dilute solution itself migrates within the substrate to contact and react with the leachates to form stable compounds from active contaminants.
  • finely composed amorphous silicic acid preferably with at least 90% by weight Si0 2 or finely composed precipitate active silicates of magnesium calcium or aluminium may be introduced into the column to provide a reservoir of active material which will be contacted by leachates doing their natural migration through the substrate.
  • Such silicic acids have a BET surface of 50 to 200 m 2 /g and d 50% value in accordance with a grain analysis of Cilas of below 20 ⁇ m.
  • the finely composed amorphous silicic acid is generally introduced into the drill hole/excavation hole and compacted under pressure.
  • the silicic acid may be preformed into a shaped article for introduction into the hole e.g. in a similar manner to plasterboard .
  • one or more of the treatment columns may need replacement or replenishment with treatment material.
  • treatment columns formed in excavated holes are preferred as they are more readily removable.
  • a treatment column can be effectively enclosed within a permeable sleeve to facilitate its removal and replacement.
  • the treatment of the invention may need to be conducted over prolonged periods of time e.g. several years. It is desirable to have monitoring stations at various points on a site to sample leachate and test for contaminants and determine whether any of the treatment columns need replenishment. Replenishment of treatment columns may involve removal and replacement if they are in areas which are readily accessible. Alternatively, when the original columns are installed ducting or pipework may be laid which allows additional treatment material to be pumped under pressure into the columns .
  • the present invention has been described with reference particularly to industrial pollutants or contaminants in "brown field" sites. It will be appreciated, though, that the invention is equally applicable to the treatment of sites polluted or contaminated in other ways, by using different treatment materials in the columns. Particularly, it can be effective in cleansing or purification systems for the treatment of organic pollutants.
  • modified silicic acid solutions described above can be useful not only in stabilising soluble sulphates in substratum materials beneath concrete, but also to stabilise other metal salt contaminants in open soil .
  • a modified silicic acid solution is introduced into an open substrate to stabilise metal salt into contaminants therein.
  • the modified silicic acid solution is preferably used at a concentration of less than 5%, preferably less than 1% as described above.
  • the open substrate may comprise contaminated soil which has been excavated and stored.
  • Dilute modified silicic acid may be used to treat the contaminated soil to stabilise the contaminants e.g. by a continuous irrigation system which applies the solution to the soil allowing it to percolate through the soil and recirculating the solution with the addition of fresh solution as necessasry.
  • control solution comprising a number of single element ICP spectroscopic standards of known concentrations was prepared.
  • analysis of the control solution is as follows:
  • ISO 110K solutions were prepared from concentrations, ranging from 1% to 20% The same tests were than repeated, each solution being added to a solution of control water and calcium ions as before. In each test to one litre of control water was added 950ml of saturated calcium oxide solution and 50ml of ISO 110K solution. In seven separate experiments, seven different concentrations of ISO 110K solution were used 0.10%, 0.15%, 0.5%, 1%, 5%, 10% and 20% Each sample of treated control water was then analysed after standing for four hours. Results are reported on the following Table.
  • the precipitate was also analysed to determine its pH value, which was found to be 11.4 in each case.
  • the precipitate seemed relatively stable, but tests were made to determine the extent of its stability by lowering its pH value. Stability was maintained until the pH value dropped below 7.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Soil Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

L'invention concerne un procédé de traitement d'un substrat pollué ou contaminé consistant à créer une pluralité de colonnes de traitement dans le substrat, chacune de ces colonnes ayant la forme d'une matrice perméable comportant une composition d'acide silicique et une solution d'un sel métallique alcalin. La taille, l'emplacement et l'espacement des colonnes est choisi de manière que les produits de lixiviation se trouvant dans le substrat viennent en contact avec une matrice lors de leur migration naturelle à travers le substrat.
PCT/GB2000/001480 1999-04-15 2000-04-17 Traitement de substrats pollues ou contamines Ceased WO2000062949A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9908632.4A GB9908632D0 (en) 1999-04-15 1999-04-15 Treatment of polluted or contaminated substrates
GB9908632.4 1999-04-15

Publications (1)

Publication Number Publication Date
WO2000062949A1 true WO2000062949A1 (fr) 2000-10-26

Family

ID=10851596

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/001480 Ceased WO2000062949A1 (fr) 1999-04-15 2000-04-17 Traitement de substrats pollues ou contamines

Country Status (2)

Country Link
GB (1) GB9908632D0 (fr)
WO (1) WO2000062949A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105075801A (zh) * 2014-09-16 2015-11-25 中国农业科学院农田灌溉研究所 利用灌溉及化控技术联合提升镉污染土壤生产力的方法
CN105127192A (zh) * 2015-09-12 2015-12-09 复旦大学 通过电化学方式加入化学溶剂降低土壤渗透性的方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0287727A1 (fr) * 1987-04-24 1988-10-26 Union Oil Company Of California Décontamination des eaux souterraines
WO1992021409A1 (fr) * 1991-05-28 1992-12-10 Démos Druzstvo Procede d'immobilisation de metaux lourds dans le sol
WO1993016797A1 (fr) * 1992-02-20 1993-09-02 Agriton Van Den Ham & Co. Couche adsorbante d'etancheite et emploi de l'adsorbant dans l'immobilisation de metaux lourds
EP0566122A2 (fr) * 1992-04-16 1993-10-20 Westinghouse Electric Corporation Procédé de décontamination in-situ de sols et eaux souterraines pollués
WO1997020600A1 (fr) * 1995-12-01 1997-06-12 Ers Milieu Techniek V/Peter Kafton Compositions de silicate aqueuses
EP0787540A1 (fr) * 1994-09-29 1997-08-06 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Produit chemique de traitement de dechets et procede de mise au rebut desdits dechets
EP0902077A1 (fr) * 1997-09-03 1999-03-17 Bagrat (UK) Limited Stabilisation de sulfates solubles dans les sols de fondations

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0287727A1 (fr) * 1987-04-24 1988-10-26 Union Oil Company Of California Décontamination des eaux souterraines
WO1992021409A1 (fr) * 1991-05-28 1992-12-10 Démos Druzstvo Procede d'immobilisation de metaux lourds dans le sol
WO1993016797A1 (fr) * 1992-02-20 1993-09-02 Agriton Van Den Ham & Co. Couche adsorbante d'etancheite et emploi de l'adsorbant dans l'immobilisation de metaux lourds
EP0566122A2 (fr) * 1992-04-16 1993-10-20 Westinghouse Electric Corporation Procédé de décontamination in-situ de sols et eaux souterraines pollués
EP0787540A1 (fr) * 1994-09-29 1997-08-06 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Produit chemique de traitement de dechets et procede de mise au rebut desdits dechets
WO1997020600A1 (fr) * 1995-12-01 1997-06-12 Ers Milieu Techniek V/Peter Kafton Compositions de silicate aqueuses
EP0902077A1 (fr) * 1997-09-03 1999-03-17 Bagrat (UK) Limited Stabilisation de sulfates solubles dans les sols de fondations

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105075801A (zh) * 2014-09-16 2015-11-25 中国农业科学院农田灌溉研究所 利用灌溉及化控技术联合提升镉污染土壤生产力的方法
CN105075801B (zh) * 2014-09-16 2018-02-09 中国农业科学院农田灌溉研究所 利用灌溉及化控技术联合提升镉污染土壤生产力的方法
CN105127192A (zh) * 2015-09-12 2015-12-09 复旦大学 通过电化学方式加入化学溶剂降低土壤渗透性的方法

Also Published As

Publication number Publication date
GB9908632D0 (en) 1999-06-09

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