Transcript Hazardous-waste

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1st period Wednesday recycling
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Nick D, Analicia – Teacher’s
lounge
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Jessica, Omid – Mr. Hoope’s
office
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Shania, Luisa – Tamar’s room
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Trenton – Mr. Wilcox’s office
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Noah, Sammy G – Odell’s room
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Morgan – Mr. O’Bryan’s room
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Cecilia – Tess’s room
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Vishaal, Mook – Citlati’s office
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Uchenna – Nida’s room
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Julie – Linda’s office
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John M – Ms. Summer’s room
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Chris – Tyler’s class
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Dean, Elliot – Ms. Becht’s room
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Joselyn T – Erin’s room (A)
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2nd period Wednesday Recycling

Jessica, Omid – Mr. Hoope’s
office

Trenton – Mr. Wilcox’s office

Morgan – Mr. O’Bryan’s room

Vishaal, Mook – Citlati’s office

Julie – Linda’s office
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Chris – Tyler’s class
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Joselyn T – Erin’s room (B)
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Hazardous Waste and
Sanitary Landfills
9/2/11
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What is an open dump landfill?
Open
dump landfills are
uncovered piles of solid waste.
 They
are more common in undeveloped
countries.
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What are Sanitary Landfills?
Solid wastes are spread into
thin layers, compacted and
covered daily with fresh clay
or plastic foam to prevent
leachate.
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What are the Pros and Cons of
Sanitary Landfill?
pros
 Low
operating Costs
 Can
Handle Large
amounts of waste.
 Filled
Land can be
used for other
purposes.
 There
limited landfill
space in many areas.
cons
 Noise, traffic, dust
 Greenhouse
gases
 Output
approach that
encourages waste
reduction
 Leachate
–
groundwater
contamination
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What is incineration?
Burning
trash
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What are the pros and cons of
Incineration?
pros
 Reduces
volume
trash
 Produces
energy
 Concentrates
hazardous
substances for burial
 Sale
cost
of E reduces
cons
 Expensive
 Produces
hazardous waste
Emits
air
pollutants
 Encourages
production
waste
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What is hazardous waste?

Any substance that is:
 Flammable
 Reactive
 Toxic
 Corrosive
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How can we detoxify
hazardous waste?
Physical
methods
Chemical
methods
Nanomagnets
Biological
– bioremediation and
phytoremediation
Plasma
Arch torch
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What are the physical methods
for detoxifying hazardous
waste?
 Charcoal
 Distilling
resins to filter solids
liquid wastes to separate out
harmful chemicals
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What are chemical methods to
detoxify hazardous waste?
Chemical
reactions (i.e.
neutralization) to convert
hazardous chemicals to less
harmful chemicals.
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What are nanomagnets?
Magnetic
particles coated
with compounds to remove
various pollutants from water.
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What is bioremediation?
Use
of biological agents, such
as bacteria or enzymes to
destroy toxins or convert them
to less hazardous waste.
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What is Phytoremediation?
The
use of naturally or
genetically engineered plants
to absorb, filter or remove
contaminates from soil and
water.
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What does a plasma arch torch
do?
Breaks
down
hazardous waste
at very high
temperatures.
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How can we store hazardous
waste?
Deep
well disposal
Surface
Above
impoundments
ground storage facilities
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What is deep well disposal?
Hazardous
wastes
are pumped through
a pipe full of dry,
porous rock, where
they soak into the
rocks.
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What are the pros and cons of
deep well disposal of Haz. Waste?
pros
 Safe
at certain sites
 Wastes
can often
be retrieved
 Low
cost
cons
 Leaks
from
corrosion of well
casing
 Emits
air pollutants
 Encourages
production
waste
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What are surface
impoundments?
Lined
ponds, pits or lagoons
in which liquid hazardous
wastes are stored.
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What are the pros and cons of
surface impoundments?
pros
 Low
Costs
 Waste
can often be
retrieved
 Can
store wastes
indefinitely with
secure double
liners
cons
 Groundwater
contamination from
leakage liners and
overflow
 Air
pollution from
volatile organic
compounds
 Encourages
production
waste
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FRQ check
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Annual precipitation at a landfill in the town of fremont is 100
mm per year, and 50 percent of this water runs off the landfill
without infiltrating the surface. The landfill has a surface of
5,000 m2 . Underneath the landfill, the town installed a leachate
collection system that is 80 percent effective. Any leachate not
collected by the system enters the surrounding soil and ground
water. This leachate contains cadmium and other toxic
materials.
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Calculate the volume of water in cubic meters (m3) that
infiltrates the landfill per year.
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100
0.1
mm/year = 0.1 m/year
m/year x 5,000 m2 x 50% = 250 m3
So
the volume of leachate in a m3 that
is treated per year is
250 m3 x 80% = 200 m 3
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Presentation Requirements
 1)
Everyone in the groups speaks
 2)
Name, Chemical structure of pollutant(s)
and characteristics
 3) Why
is it “Hazardous”?
 4)Summary
 5)
of Case Study
Recommended management plan
 6) Visual
(ppt or poster)