CONTAMINATION AND REMEDIATION OF FOREST SOILS IN SURROUNDINGS OF A - - PowerPoint PPT Presentation

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CONTAMINATION AND REMEDIATION OF FOREST SOILS IN SURROUNDINGS OF A - - PowerPoint PPT Presentation

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CONTAMINATION AND REMEDIATION OF FOREST SOILS IN SURROUNDINGS OF A NICKEL SMELTER Igor Ermakov, Galina Koptsik Moscow State University, Soil Science Faculty Soil Science Faculty, 08.06.2006 1 Moscow State University Podzol soils under

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Soil Science Faculty, Moscow State University 08.06.2006 1

CONTAMINATION AND REMEDIATION OF FOREST SOILS IN SURROUNDINGS OF A NICKEL SMELTER

Igor Ermakov, Galina Koptsik Moscow State University, Soil Science Faculty

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Soil Science Faculty, Moscow State University 08.06.2006 2

Podzol soils under spruce forest and agricultural vegetation

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Soil Science Faculty, Moscow State University 08.06.2006 3

Aims:

  • to find out the main patterns of heavy metal pollution under

simulated atmospheric precipitation

  • to forecast natural remediation of podzol soil if atmospheric

pollution would be stopped

  • to develop a simple and economical technology for metal in-

situ removal from contaminated soils

The work was supported by INTAS (01-2213) EC FP6 (INCO-CT-2005-013420) RFBR (05-04-48460-а)

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Soil Science Faculty, Moscow State University 08.06.2006 4

Scheme of column experiment

Background precipitation Polluted precipitation

Background soil Polluted soil Background soil Polluted soil

Four types of percolates

Filtration through 0.45 µm filters

Analysis for pH, DOC and heavy metal concentrations

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Soil Science Faculty, Moscow State University 08.06.2006 5

pH values in column percolates

Background precipitation

3 4 5 6 7 40 80 120 160

Time, days pH Background soil Background forest floor Polluted soil Polluted forest floor Precipitation

Polluted precipitation

3 4 5 6 7 40 80 120 160

Time, days pH

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Soil Science Faculty, Moscow State University 08.06.2006 6

Leaching of DOC under simulated precipitation (cumulative curves)

Background precipitation

10 20 30 40 50 60 40 80 120 160

Time, days DOC, g/m2

Background soil Background forest floor Background forest floor (fulvic acids) Polluted soil Polluted forest floor Polluted forest floor (fulvic acids)

Polluted precipitation

10 20 30 40 50 60 40 80 120 160

Time, days DOC, g/m2

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Soil Science Faculty, Moscow State University 08.06.2006 7

Leaching of nickel under simulated precipitation (cumulative curves)

Background precipitation

100 200 300 400 500 40 80 120 160

Time, days Ni, mg/m2 Background soil Background forest floor Polluted soil Polluted forest floor Precipitation

Polluted precipitation

200 400 600 800 1000 40 80 120 160

Time, days Ni, mg/m2

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Soil Science Faculty, Moscow State University 08.06.2006 8

Leaching of copper under simulated precipitation (cumulative curves)

Background precipitation

5 10 15 20 25 30 40 80 120 160

Time, days Cu, mg/m2 Background soil Background forest floor Polluted soil Polluted forest floor Precipitation

Polluted precipitation

200 400 600 800 40 80 120 160

Time, days Cu, mg/m2

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Soil Science Faculty, Moscow State University 08.06.2006 9

Testing of different sorbents for heavy metal retention

Ni adsorption isotherms

50 100 150 200 250 300 350 400 450 0,0 1,0 2,0 3,0 4,0

Ni equilibrium, mmol/l Ni sorbed, mmol/kg activated carbon vermiculite bentonite zeolite pearlite flue ash microspheres

Cu adsorption isotherms

50 100 150 200 250 300 0,0 0,5 1,0 1,5 2,0

Cu equilibrium, mmol/l Cu sorbed, mmol/kg

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Soil Science Faculty, Moscow State University 08.06.2006 10

Conclusions:

  • Contaminated precipitation strongly acidified the

mineral soil layers, and there is a real possibility for acidification of ground waters.

  • The background forest floor has a very high retention

capacity towards both Ni and Cu. Contaminated forest floor kept almost the same buffer capacity towards Cu but strongly decreased the accumulation

  • f Ni.
  • The retention of metals in the mineral layers was

much less significant. Although the polluted mineral layer removed the majority of input Cu, it had a little effect on percolate Ni concentrations.

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Soil Science Faculty, Moscow State University 08.06.2006 11

Conclusions:

  • Natural soil remediation is impossible without

simultaneous contamination of ground waters.

  • Leaching of Ni from the soils is more rapid than that
  • f Cu, and the risk of Ni contamination of ground

waters is higher.

  • Leaching of Cu would be expected to take place
  • ver a longer time period, giving a consequently

lower risk of groundwater pollution.

  • Testing of different sorbents showed that activated

carbon and vermiculite can be used for Cu retention. Vermiculite also has the highest retention capacity towards Ni.

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Soil Science Faculty, Moscow State University 08.06.2006 12

The 6th Framework Programme, European Commission

  • CLEANSOIL - An Innovative

Method for the On-Site Remediation of Polluted Soil Under Existing Infrastructures (INCO-CT-2005-013420)

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Soil Science Faculty, Moscow State University 08.06.2006 13

Thank you for attention