Chapter 21: Solid, Toxic and Hazardous Waste

Chapter 21:Solid, Toxic and Hazardous

WasteBrita Christensen and Carlye Richter

Case Study: South Africa’s “National Flower”-Some South Africans began referring to plastic bags as the country’s national flower-Each year shops hand out 8 billion light-weight, single-use bags-If they were thicker (80 microns) they would be reusable and litter would be reduced-Trade unions fear that current machines wouldn’t be able to make such bags, causing unemployment-If the bags were thicker, stores would charge more for them, making customers more likely to reuse

Solid Waste

The U.S. produces 11 billion tons per year

½ is agricultural waste 1/3 of all solid wastes

are produced from mining and primary metal processing

Road and building construction debris

Improper disposal methods spread waste

Industrial waste is 400 million metric tons a year

60 million of these are hazardous or toxic waste

Municipal waste is 200 million + metric tons a year

2/3 of a ton per person

Question!

How many tons of solid waste does the U.S. produce every year!?

The Waste Stream

Definition: the steady flow of varied wastes that we all produce, from domestic garbage and yard wastes to industrial, commercial and construction refuse.

Most of this waste could be valuable if it wasn’t mixed

Hazardous materials spread through garbage making disposal processes more difficult, expensive and risky

Examples of potentially hazardous trash: spray paint cans, pesticides, batteries, cleaning solvents, dioxin releasing plastics

Question!

What is one example of potentially hazardous trash!?

Open Dumps Release Hazardous Materials Into

Air and Water--The Three “R’s”

Waste Disposal Methods

Open, unregulated dumps are predominant in most developing countries

Mexico City produces 10,000 tons of trash a day

Manila, Philippines –half of their waste collects in “Smoky Mountain” -20,000 people live and work there

Open dumping has been banned in most places, but illegal dumping is still a problem

200 million L of motor oil are illegally dumped a year –5 times the amount spilled from Exxon Valdez, 1989

Toxic chemicals are showing up in groundwater supplies that ½ of America depends on for drinking-Theoretically, one liter of gasoline could make a million liters of water undrinkable

Ocean Dumping is Nearly Uncontrollable

-25,000 metric tons (55 million lbs.) of packaging a year are dumped at sea.-Federal legislation prohibits dumping of municipal refuse, industrial waste, sewage and sewage sludge in the ocean-60-80 million m3 of dredge spoil are disposed of at sea.

Landfills Receive Most of Our Waste

-Sanitary landfills are an alternative to open dumps-This method regulates and controls solid waste disposal-landfill operators are required to compact the refuse and cover it with a layer of dirt, this controls pollution but also takes up 20% of landfill space-An impermeable clay and/or plastic lining underlies and encloses the storage area in landfills-Drainage systems surrounding the liner catch drainage and monitor chemicals that may be leaking-location is essential to landfills, demonstrating concern for long-term effects associated with this form of disposal

Question!

What is an alternative to open dumps!?

More on Landfills …-The U.S. spends $10 billion a year to dispose of trash-1,200 of the 1,500 existing landfills in the U.S. have closed since stricter financial and environmental protection requirements for landfills took effect in 1984-Cities have begun exporting trash which is expensive-Methane –an important GHG is important to recover.-It seeps to the surface of a landfill and escapes, but now it is collected and burned.-Landfills could provide enough electricity for a city of a million people

Question!

How much money does the U.S spend per year on disposing of trash!?

Most industrialized nations have agreed to stop shipping hazardous and toxic waste to less-developed countries

The Taiwan village disaster Poor neighborhoods and minority populations

are much more likely than richer ones to be the recipients of dumps, waste incinerators, and other locally unwanted land uses (LULUs)

One method of disposing of toxic wastes is to recycle them

Manufacturers are now required to report the “active” ingredient content of their product, but much can go unreported as “inert” matter

Exporting Waste Exposes Villagers to Hazards

Burning serves as an alternative to landfills Energy-recovery Refuse-derived fuel Mass burn Incinerators are costly, but can also extend the lifetime of

existing landfills EPA found high levels of toxic substances in incinerator ash

–more in the fly ash than others EPA says the danger is small, and causes 1 death per

million people every 70 years, though critics claim it to be 250 per million

To reduce dangers, remove batteries containing heavy metals and plastics containing chlorine before incineration (eliminates majority of dioxins and other by-products)

Incineration Produces Energy but Causes Pollution

What is one advantage of incinerators?

Question!

Shrinking the Waste Stream

• Recycling means reusing, but also reprocessing• One problem for recyclers is the fluctuation in market

prices for commodities• Another problem is contamination (ex: soda bottles)• Plastic recycling is down 50% due to “on the go”

packaging• Recycling is the best alternative because it saves

money, energy, raw materials, and land space• Encourages individual awareness and responsibility• Recycling has quadrupled since 1980, right now Japan is

the world’s leader, recycling ½ of it’s municipal waste• When waste is well sorted, recycling is most successful• Recycling reduces our need for raw resources• Although public policy favors the use of raw material

now, government statutes are working to change that

Composting is the most common form of large-scale recycling

Cities and towns have begun providing compost facilities to save landfill space

Organic debris is 12% of our waste stream, and ½ of organic waste is composted

An increasing number of the thousands of tons of debris sent to landfills is being collected, sorted and resold

Thermal conversion Process (TCP)

Commercial-scale Recycling and Composting

De-manufacturing• Definition: the disassembly

and recycling of obsolete products like TV sets, computers, refrigerators and air conditioners. Electronics and appliances are one of the fastest-growing components of the global waste stream

• E-waste –computers, cell phones, TVs and printers

• A single computer can contain 70 different chemical compounds

• 40% of lead and 70% of heavy metals come from e-waste

• Some nations have taken the initiative in reducing these environmental hazards

What is an example of E-waste?

Question!

Reusing vs. Recycling Reusing is better than

recycling The reusable, refillable bottle

is the most efficient beverage container we have

Big companies prefer recyclable containers over reusable containers because they are more cost efficient

In some cases, reusing is not energy efficient

Where manufactured products are expensive and labor is cheap, it pays to reuse

Question!

Which is better: reusing or recycling?

Reducing Waste is Often the Cheapest Option

• Excess packaging of food and consumer products is one of our greatest sources of unnecessary waste

• Paper, plastic, glass and metal packaging material make up 50% of our domestic trash by volume

• Most packaging is primarily for marketing purposes• Canada’s National Packaging Protocol (NPP)• 1) no packaging 2) minimal packaging 3)

reusable packaging 4) recyclable packaging• -Photodegradable plastics • Biodegradable plastics• Both are compostable or degradable• Sometimes materials don’t decompose completely• The most effective way to save energy, materials,

and money is to slow the consumption of throwaway products

• Hazardous waste –any discarded material, liquid or solid, that contains substances known to be (1) fatal to humans or laboratory animals in low doses (2) toxic, carcinogenic, mutagenic, or teratogenicto humans or other life-forms (3) ignitable with a flash point less than 60 degrees Celsius (4) corrosive or (5) explosive or highly reactiveMost hazardous waste is recycled, converted to nonhazardous forms, stored or otherwise disposed of onsite by the generators5 billion metric tons of highly poisonous chemicals were improperly disposed of in the U.S. between 1950 and 1975

Hazardous Waste Must be Recycled, Contained or

Detoxified

Hazardous and Toxic Wastes

• The most dangerous aspect of the waste stream is that it often contains highly toxic and hazardous materials that are injurious to both human health and environmental quality

• The EPA states that industries in the U.S. generate about 265 million metric tons of officially classified hazardous wastes each year, slightly more than 1 ton for each person in the country

• 40 million metric tons (22billion lbs.) of toxic and hazardous wastes are released into the air, water, and land in the U.S. a year

Question!

Why is the waste stream so dangerous?

Federal Legislation• The Resource Conservation

and Recovery ACT of 2976• The Comprehensive

Environmental Response, Compensation and Liability Act (CERCLA or Superfund ACT) of 1980 (modified in 1984 by the Superfund Amendments and Reauthorization Act (SARA))

• The Toxic Release Inventory requires more 20,000 manufacturing facilities to report annually on releases of more than 300 toxic materials

Superfund Sites are Those Listed for Federal Cleanup • The EPA estimates that there

are at least 36,000 seriously contaminated sites in the U.S.

• The GAO says it’s higher (400,000 +)

• By 1997 1,400 sites were on the NPL (National Priority List) for cleanup financed by the federal Superfund program

• Superfund –a revolving pool designed to (1) provide an immediate response to emergency situations that pose imminent hazards and (2) to clean up or remediate abandoned or inactive sites

Case Study #2: Hardeman County, Tennessee

• The chemical build up began when William T. Love left his project of a man-made canal unfinished

• Hooker Chemicals Corp. used this as a landfill

• The runoff started emerging throughout the community

• The seepage caused adverse effects among community members

• Some included: birth defects, miscarriages, still births, cancers, heart diseases, nervous system defects and other health related issues

• The tragedy was resolved only after many activist efforts

Brownfields Large areas of contaminated properties that have

been abandoned or are not being used up to their potential because of real or suspected pollution

No one wanted to redevelop brownfields because of liability

Why does no one want to redevelop brownfields?

Question!

Redeveloping Brownfields Reusing contaminated

properties can rebuild old cities, create jobs, increase the tax base, and prevent needless destruction of open space at urban margins

Programs have been established at the federal and state levels to encourage brownfield recycling

Must pass EPA standards

What do we do with toxic and hazardous wastes?

Produce less waste! Modify manufacturing processes, recycle, and reuse

material Convert to less hazardous substances! (several

processes to make hazardous materials less toxic) Physical treatments- tie up or isolate substances Incineration- burning wastes Chemical processing- transform materials into nontoxic Bioremediation- uses microorganisms to absorb,

accumulate, and detoxify toxic compounds

What else do we do with toxic and hazardous wastes?

Store permanently! Permanent retrievable storage- placing waste storage

containers in a secure building, salt mine, or bedrock cavern where they can be inspected periodically and retrieved for repacking or for transfer

Secure landfills- must be safe Thick bottom cushion of compacted clay Layer of gravel over the clay and drain pipes to collect seepage Thick polyethylene liner Layer of soil or absorbent sand cushions Wastes packed in drums, separated into small units

What is one method of disposing of hazardous wastes?

Question!