Boojum Research LTD - 25 years of Ecological Engineering Invited by West Virginia Mine Drainage Task Force Symposium Morgantown , March 2011 M. Kalin and W. N. Wheeler Boojum Research Ltd Toronto, Canada The role of Phosphate and Phosphate mining wastes in controlling ARD and AMD. Is it a chemical or biological role or is it both ?
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Boojum Research LTD - 25 years of Ecological Engineering Invited by West Virginia Mine Drainage Task Force Symposium Morgantown, March 2011 M. Kalin and.
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Boojum Research LTD - 25 years of Ecological Engineering
Invited by West Virginia Mine Drainage Task Force Symposium
Morgantown , March 2011
M. Kalin and W. N. Wheeler Boojum Research Ltd
Toronto, Canada
The role of Phosphate and Phosphate mining wastes in
controlling ARD and AMD.
Is it a chemical or biological role or is it both ?
Boojum Research LTD - 25 years of Ecological Engineering
Margarete Kalin/Boojum Research LTD• President and founder of Boojum Research LTD
• Adjunct professor at U of Toronto, Ryerson University, U of Windsor, Queen’s Univeristy , Kingston
• QEP with the Institute of Environmental Practice and Senior Ecologist with the American Ecological Society.
• has written and presented more than 100 scientific papers, many book chapters and more than 100 technical reports
• has applied the technology to effluent streams from coal, uranium, base metal and precious metals in North and South America as well as Europe.
RECIPIENT OF THE: Noranda Award for Outstanding Achievement in the Field of Land Reclamation Teck-Cominco Environmental Award Distinguished Lecturer for the Canadian Institute of Mining.
No patents – Natural processes : Virtual Library
http://biblio.laurentian.ca/boojum
Company is 29 years old, with contracts worldwide.
Canadian contracts only shown
Boojum Research LTD - 25 years of Ecological Engineering
ECOLOGICAL ENGINEERING aims to practically and beneficially apply knowledge of how ecological systems operate on the mineral and rocks surfaces within these landforms
1838Ehrenberg
Gallionella ferruginea with ochreous deposits of bog
iron.
1887Winogradsky Beggiatoa
oxidation H2S to elemental sulfur; Leptothrix ochracea oxidation of FeCO3 to ferric
oxid
1919Harder
microbial iron oxidation and precipitation in iron
sedimentary deposits.
Stutzer (1911)Vernadsky (1908-1922)
Geomicrobiology has a long history- and they dominate the MWWMA ecosystem
These ecosystems are living landforms – they change with time
Mineral Surfaces: The Site of the Problem and the Solution
Oxidation of sulphide particles in tailings, waste-rock piles, underground mine workings and open pit walls Limited by the transport of oxygen
Convection, advection or diffusion to the mineral surface
Bacterial biofilm activity – BOTH OXIDATIVE AND REDUCTIVE – CHANGE THE HABITAT / ENVIRONMENT
Scale diagram of typical bacteria size compared to the surface roughness
Nutrients need to be added, NOT to the water, BUT to the rock surfaces and it has to stick to the rock in the oxidation pit
Members of this Task force did leading work with tests of phosphate material
Results from 5 Soxhlet leaching cycles – Appendix 1
My conclusion; Internal precipitation took place* Calculated average N=3 ** N= 24, each amendment all application rates N=3
pH Fe S Acidity Cond
NO PHOSPHATE* Cycle 1 2.0 1100 3000 360 14.20
Cycle 2 2.6 170 400 38 2.70
Cycle 3 2.8 55 140 29 1.66
Amendments all types including North Carolina phosphate
----------------------------- min – max -------------------------------
Control 1.14 t PO₄ 0.55 t PO₄45 28 25-55 -25 12550 5 -754.2 5.5 7.75
Day 500Mg FeS₂ OX per day/ per g FeS₂ NET ALKALINITY (mg/l CaCO₃)
ACID LOAD g/d CaCO₃ EQU.pH
• Fill #2 - 366 Tons shale/coal (parting)• Fill #6 - 367 Tons shale/coal l with 1.14 tons of apatite
rock• Fill #7 - 368 Tons shale/coal with .55 tons of apatite rock
Results were good – but did not make sense – so let‘s think what went wrong!
Acid Mine drainage treatment: Phosphate Technology- the chemical Phosphate role • P and Fe cycling are closely linked• P concentrations (e.g. for organisms) are generally very low• P is sequestered as co-precipitates with Fe hydroxides (oxic
conditions)• P forms metal salts (anoxic conditions)• P is bound by organics (e.g. humic substances in muskeg)• P may absorb to pyrite (source of AMD) surfaces and inhibit
acid generation
The Northern Miner Magazine Sept Oct.
1991 reported on the cessation leaching of
Cu from a dump in B.C.
Sample obtained in 1992
Boojum Research LTD - 25 years of Ecological Engineering
How did it start? A customer requested that something should be done to reduce oxidation rather than waiting for it occur!
The key questions are :
How do we get NPR to the mineral surface or to the place where the AMD is generated? AND It has to be economic and practicalIt has to be suistainable – lasting for everIt has to be general – i.e. work in all types of wastes
NPR Code 484 mm to < 0.04 mm
Relating the Scale of the Observations
Phosphate Rock
Waste Rock1
50mm
Boojum Research LTD - 25 years of Ecological Engineering
B- zone waste rock pile in distance with muskeg area in front
Boojum Research LTD - 25 years of Ecological Engineering
B-zone waste rock pile
Boojum Research LTD - 25 years of Ecological Engineering
B-zone waste rock pile
LOAD IN SEEPAGES As Fe SAnnual Load % Leached from pile %/year 0.26 0.0003 0.65Years to exhaustion year 378 322 153
Maximum elemental concentrations in Rock and Secondary Precipitate As Fe SWhole Rock
mg.g-1 2.7 43 1.5n=97
WRP-P Precipitatemg.g-1 242 206 7.2
n=1
Distribution of measured elements comprising 10% of a Waste Rock Pile As (0.07%)
S (0.29%)
Fe (10%)
We had to work in the field first – it has to work there, so we set up large field tests with Texas Gulf Natural Phosphate Rock – Train cars full of the stuff came to Northern Ontario and Quebec • In uranium tailings
• In phyrrotite tailings ( Cu , Ni ) • In coal, coarse waste rock • in polymetallic concentate spills• In sulphidic waste rock ( Cu , Zn )
Autopsy section overview
Piles 1 to 4Lime compacted etc
Pile 5 NPR
Tailings Surface Cover Development through Integration of Reactive Phosphate and Organic Matter (PHITO)
Boojum Research LTD - 25 years of Ecological Engineering
integrate nutrients, precipitation agents and NPR below the roots, then grow organics
Stanrock: Horse Manure and Natural Phosphate Rock 1995
Boojum Research LTD - 25 years of Ecological Engineering