coal - pc\|macimages.pcmac.org/.../uploads/presentations/4.6_coal2.pdf · 2019. 9. 25. · coal...
TRANSCRIPT
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Coal
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Lower Kittanning Coal Seam,
Clarion University Campus
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Varieties of Coal
• Anthracite: "hard coal," anthracite is formed from bituminous coal
when great pressures developed in folded rock strata during the
creation of mountain ranges. Anthracite has the highest energy
content of all coals and is used for space heating and generating
electricity.
• Bituminous: Bituminous coal the type most commonly used for
electric power generation in the U.S.
• Subbituminous: Subbituminous coal formed from the remains of
trees, ferns and other plants that existed and died during the time of
the dinosaurs. A dull black coal
• Lignite: Increased pressures and heat from overlying strata caused
buried peat to dry and harden into lignite. Lignite is a brownish-black
coal with generally high moisture and ash content and lower heating
value.
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Where is coal mined?
(millions of tons, 2004)
1980:
Appalachia 438
Western 210
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Coal 1994
Petroleum liquids 31.2
Petroleum Coke 14.2
Natural gas 876.9
Other gases 11.6
Nuclear 806
Other 10.4
Hydro 248.1
Biomass 55.9
Geothermal 14.9
Solar/PV 0.8
Wind 52
Units in table are billion
kilowatt hours.
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Coal Facts
• Total demand for U.S. coal reached 1.05 billion tons in
2010.
• Nearly half of U.S. electricity is generated from coal.
• 9 out of every 10 tons of coal mined each year in the
U.S. is used for domestic electricity generation.
• Each person in the U.S. uses 3.4 tons of coal annually.
• There are approximately 600 coal generating facilities
(1,470 generating units) and 1,100 manufacturing
facilities using coal in the U.S., according to the U.S.
Energy Information Administration (EIA).
• EIA estimates that 73% of all coal-based generating
capacity was 30 years or older at the end of 2010.
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More Coal Facts
• The U.S. has 261 billion tons of recoverable coal
reserves
• That is a 235-year supply at current rate of use
• Coal accounts for approximately 94 percent of the
nation's fossil energy reserve
• Coal is found in 38 states, under 458,600 square miles-
or about 13 percent of the nation's land area
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A historic shift in electric generation
• 331 recently announced closings of old coal
fired power plants, mostly in 2015, and including
6 in Pennsylvania
• 258 new natural gas fired power plants currently
under construction
• Coal market share has fallen from 52% in 2000
to 39% in 2011
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Who to Thank for Healthier and
Cleaner Air and Water?
• Interstate Toxics Rule (EPA)
– Interstate Toxins Rule (2012)
– Cross-state Air Pollution Rule (in progress)
• Marcellus Shale Industry
(various corporations that people love
to hate (while buying fuel from them))
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Environmental Effects of Coal Use
• Water pollution
• Subsidence
• Loss of farmland and forests
• Air Pollution
• Waste Disposal
• Carbon flux
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Methods of Mining Coal
• Deep Mines
• Longwall Mining
• Surface Mining
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Formation of acid mine drainage
• Fracturing of overburden allows groundwater
to percolate through bedrock strata that were
formerly impermeable
• These strata often contain high
concentrations of pyrite (FeS2)
• Groundwater leaches pyrite from the bedrock,
carries it to the surface where it reacts with
oxygen
• 4FeS2+15O2+14H2O > 4Fe(OH3) + 8(SO4) 2 + 16H+
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Aluminum floc
from AMD -
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Scope of Problem: Pennsylvania
• Over 3,000 miles of stream have been
degraded in PA
• Daily influx of more than 1 billion gallons
of acid-mine drainage
• Economic cost associated with loss of
recreational fisheries alone exceeds 67
million / yr
• Cleanup costs for PA estimated to
exceed 15 billion
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SMCRA: Surface Mine Control and
Reclamation Act of 1977
• Regulates current mining practices
– Permitting: A reclamation plan is developed for
each mine at the time of permitting
– Bonding: Coal mining companies must post a
bond to guarantee reclamation of land
– Regulatory: Created OSM, Office of Surface
Mining
– Performance standards: regulations pertaining
to operations and reclamation (restore natural
vegetation)
– Land restrictions, no mining in parks, etc.
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SMCRA: Surface Mine Control
and Reclamation Act of 1977
• Created the abandoned mine lands (AML)
fund for reclamation work
– Taxes coal sales (35 cents/ ton) to fund
reclamation work (AML fund)
– Reauthorized in 2006 for 15 years
– Current expenditures about 500 million per year
– PA DEP commits to spending 30% of the 1.4 B it
will receive for water quality restoration
– PA has spent some 650 M on restoration, total
price is as high as 15 B
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Methods of Remediating AMD
• Diversion of surface and ground water
• Chemical (Active) Treatment
• Passive Treatment
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Water Diversion
• Groundwater diversions drains
• Revegetation,
• Restoration of soil profiles
• Surface contouring
• Surface caps
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Chemical Treatment – addition of:
– Calcium cabonate (lime)
– Calcium hydroxide
– Sodium carbonate (quicklime)
– Sodium hydroxide (caustic soda)
to mine effluent
• Calcium compounds cost less, but are
less soluble and require mixing aid
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Precipitates Formed
Through Chemical
Reaction
• The goal of
chemical
treatment systems
is to allow alkaline
material to
combine with the
mineral acidity to
precipitate the
metals out of the
AMD. This
neutralizes the
effluent so it can
be released
without causing
harm to the
environment.
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Passive Treatment Systems
• Designed to:
– Generate Alkalinity
– Neutralize Acid
– Precipitate Metals
• Resulting in overall improvement in water
quality of discharge before entering
stream.
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Components of passive
treatment • Anoxic Limestone Drains (ALD)
• Settling Ponds-aerobic wetlands
• Vertical Flow Wetlands / Successive
Alkalinity Producing Systems (SAPS)
• Function: add alkalinity, allow metals to
settle out of solution
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REM Passive Treatment System near Corsica, PA
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Strattanville-Reed Treatment
System
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Recycling Iron Hydroxide
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Issues
• Cost-effectiveness
• Longevity
• Compliance with Clean Water Regs
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Mill Creek Watershed
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Figure 6: Howe Bridge Discharge pH over Time
Year
92 93 94 95 96 97 98 99 00
Fie
ld p
H
4
5
6
7
8
Right SysDys
Left SysDys
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Figure 5. Removal efficiency for acidity, iron, and manganese at
the Howe Bridge passive treatment system over time.
91 92 93 94 95 96 97 98 99 00
% R
emo
val
0
20
40
60
80
100Acidity
Fe
Mn
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Additional Environmental Issues
Associated With Coal Mining
• Longwall mining and subsidence
• Loss of farmland for forests
• Mountain Top removal
• Disposal of Fly-ash
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Longwall Mining
• 100 Operations in US, mostly in Appalachia
• 31% US Coal production
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Types of damage
• Damage to homes
– Cracked masonary
– Damaged foundations
– Cracked plaster
• Lost water supply (wells)
• Damage to roads and railways
• Subsiding streams, loss of surface water • http://www.youtube.com/watch?v=wyyINgzZ8Gw
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Mountaintop Removal Up to 1000’ of overburden moved into adjoining valley
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Broad extent in Appalachia, with more than
400,000 acres affected
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Valley Fill
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Websites
http://earthobservatory.nasa.gov/Features/MountaintopRemoval/
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Legal protection against
mountaintop removal
• SMCRA 1977 – prohibits surface mining
within 100 ft. of perennial or intermittent
streams
• 2006 – EPA proposed changing this rule
to “minimize the destruction of fish and
wildlife to the extent possible”
• 2010 – EPA changed rule to strictly
regulate water quality – 300 mg/l TDS
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Legal protection against mountaintop removal
• Clean Water Act of 1977 - prohibits
industries from dumping waste into
waterways
• EPA 2006 rule change states that debris
from the mountaintop is not waste and
therefore, companies are free to dump
material into valleys
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Waste Disposal
• Flyash – the ash captured from Chimney of coal fired
boilers
• Bottom ash – captured from bottom of furnace
• Silicon dioxide, aluminum oxide, iron oxide, calcium oxide
• arsenic, beryllium, boron, cadmium, chromium, chromium
VI, cobalt, lead, manganese, mercury, molybdenum,
selenium, strontium, thallium, and vanadium, along with
dioxins and PAH compounds
• Nearly half is recycled (portland cement, bricks, roadbeds)
• Often stored on site, eventually remainder is placed into
landfills
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Flyash – wasteproduct of burning coal
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Kingston TN 2008
• 5.4 million
cubic yards
• 1.4 Billion
cleanup
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Minerals – Fast Facts
• Every American uses an average of nearly 40,000
pounds of newly mined materials each year
• Telephones are made from as many as 42 different
minerals, including aluminum, beryllium, coal, copper,
gold, iron, limestone, silica, silver, talc and wollastonite.
• A television requires 35 different minerals, and a
computer requires 30 minerals
• The construction industry accounts for approximately 51
percent of US copper demand.
• Silver's largest market use is for industrial applications,
particularly as an electrical connector. Jewelry is the
second largest use of silver.
• The Toyota Prius plug-in-hybrid requires about 50
pounds of rare earth metals for its motor and battery.
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Gold Mines (Zortman-Landusky)
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Cyanide Heap-Leach Gold Mining
• Began in 1970’s
• Allows the
processing of
low grade ore
• 35 tons of ore
per ounce of
gold
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Iron Mines
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Copper Mines • Kennecott
Mine,
Utah
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Phosphate Mines Bartow, FL
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