boojum research ltd - 25 years of ecological engineering invited by west virginia mine drainage task...
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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 ?
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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.
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No patents – Natural processes : Virtual Library
http://biblio.laurentian.ca/boojum
Company is 29 years old, with contracts worldwide.
Canadian contracts only shown
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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
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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
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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
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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
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Members of this Task force did leading work with tests of phosphate material
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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 -------------------------------
pH Fe S Acidity Cond
Cycle 1** 1.8 – 2.3 436 – 1206 3314 -1925 150 – 390 7.2 – 13.75
Cycle 2 2.8 – 3.6 25 – 119 190 – 493 8 – 32 1.3 – 2.36
Cycle 3 2.8 – 3.5 8 – 63 103 - 357 7 - 28 1.0 – 1.4
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Field experiment
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!
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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
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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!
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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
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NPR Code 484 mm to < 0.04 mm
Relating the Scale of the Observations
Phosphate Rock
Waste Rock1
50mm
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Boojum Research LTD - 25 years of Ecological Engineering
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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
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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%)
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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 )
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Autopsy section overview
Piles 1 to 4Lime compacted etc
Pile 5 NPR
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Tailings Surface Cover Development through Integration of Reactive Phosphate and Organic Matter (PHITO)
Boojum Research LTD - 25 years of Ecological Engineering
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integrate nutrients, precipitation agents and NPR below the roots, then grow organics
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Stanrock: Horse Manure and Natural Phosphate Rock 1995
Boojum Research LTD - 25 years of Ecological Engineering
Heterotroph Oxygen RequirementsHeterotrophs counted fresh tailings: 107/g
Populations oxygen requirement: 175µL/g
Oxygen present in fresh tailings: < 20 µL/g
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Boojum Research LTD - 25 years of Ecological Engineering
Only practical long term tests in mining wastes in the field can provide evidence of the validity of the assumptions
•Tests NPR additions to tailings and conc. spill
•2- 85 % sulphide
• left in field 3.2-3.7 years
•monitor the pore water metal acidity
•TAILINGS AREA – Inco: 2700m2; Stanrock:432 m2
•Test NPR additions to waste rock •4-15 % sulphide •left outdoors 2.7 years •monitor the effluent metal acidity•Monitoring 1.8
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Boojum Research LTD - 25 years of Ecological Engineering
Results of the waste rock drums
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pH profile for low pyrite
Stable layer
Boojum Research LTD - 25 years of Ecological Engineering
Unstable layer
no matter what amount of pyrite – acid rock drainage is with you !
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Uranium Pyhrrotite Polymetalic Waste rock
Elements (mg.L-1)
Control NPR Control NPR Control NPR Control NPR
N=1 N=1 N=1 N=1 N=2 N=2 N=3 N=6
Fe 18 0.01 43 0.1 1053 0.02 3.77 0.32
P 0.03 0.05 0.22 6.9 0.16 0.04 0.20 0.13
S 630 510 4460 1060 3020 500 126 123
pH 2.67 6.75 3.06 3.84 2.59 5.40 4.06 6.09
Acidity (mgCaCO3 .L-1) 656 39 6715 1090 5544 87 257 76
If sulphide oxidation can be reduced - the process has to be similar in a large variety of mining wastes:
Pore water results : Control NO NPR and NPR additions
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OXIDATION RATES
Boojum Research LTD - 25 years of Ecological Engineering
r = 10-19.71 (±0.86). Eh12.93(±1.04). pH1.0(±0.29) (1)log r =-19.71(±0.86) + 12.93(±1.04)log(Eh) +1.0(±0.29)log(pH)
Williamson and Rumstidt . 1994
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16x
The reactant: Phosphate mining wastes or Natural Phosphate Rock
• Un-economic for fertilizer production• a sedimentary deposit N. Carolina – Sea
shells –Shark teeth (organophosphate)
• grain size 4cm to < 0.04 mm• NPR contains 8-12 % P and 20-35 % Ca
(as CaCO3)
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Taylor mesh conversion and size description for the NPR Code 48 particles
Taylor Mesh Size Used
Range of Particle Diameter (mm)
M.I.T Particle Classification
Percent finer than
Percentage of the total material
6 >3.35 Fine Gravel (44.8%)
90.754% 9.246%
8 2.36 - 3.35 55.183% 35.571%
10 1.7 - 2.36
Coarse Sand (52.0%)
10.281% 44.902%
14 1.18 - 1.7 4.826% 5.455%
20 0.85 - 1.18 3.881% 0.944%
28 0.6 - 0.85 3.229% 0.652%
35 0.425 - 0.6Medium Sand
(2.2%)
2.600% 0.630%
48 0.3 - 0.425 1.819% 0.781%
54 0.212 -0.3 1.008% 0.811%
100 0.15 - 0.212Fine Sand
(0.7%)
0.736% 0.271%
150 0.106 - 0.15 0.400% 0.336%
200 0.075 - 0.106 0.270% 0.130%
270 0.053 - 0.075
Silt (0.3%)
0.176% 0.094%
325 0.045 - 0.053 0.116% 0.060%
400 0.038 - 0.045 0.065% 0.051%
<400 <0.038 0.000% 0.065%
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MACRONUTRIENTSMACRONUTRIENTSP (nucleic acids synthesis, ATP),
K (enzymes activation), Ca (cells walls and endospores),
Source :Chapelle, F; (1993 “Ground-Water Microbiology & Geochemistry” John Wiley & Sons, Inc)
1. NPR is acid-soluble and provides all the nutrients needed for microbial growth
2. It needs to be in particulate form on the mineral surface to change the environment
3. We suspect the fine particles made it to the mineral surface4. We dissolved NPR in 0.1N sulphuric acid and only a fraction of it dissolved
5. WE HAD THE BIOLOGICAL ROLE OF NPR!
-
MICRONUTRIENTSMICRONUTRIENTS Fe (electron transport systems),
Mn, Cu, Ni, Mo, Co and Zn (components of protein complexes and
enzyme activators)
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Scanning Electron Microscopy of Waste Rock Surface (1st Observation)
Boojum Research LTD - 25 years of Ecological Engineering
1995
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Boojum Research LTD - 25 years of Ecological Engineering
Boojum Research and U of Toronto(ongoing research)
After 3 years of outdoor exposure and 11 years of storage
P
SAu
Fe
20092007
AMIRA P933 Report
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Mineral Surfaces: The Site of the Problem and the Solution
Untreated waste rock
Waste rock with NPR
Untreated waste rock
Waste rock with NPR
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Bugs generally cause only trouble, but when fed, they are here to help!
A mining research group confirmed the presence of a biofilm on rocks from our
experiment in 2008.
• It is presently being tested on other waste rock by the same group.
• Do you want to reduce Acid Generation? • What are you waiting for. We are ready to
work with you?