Hazrdous Waste

HAZARDOUS WASTE

Signs/Symbols

Toxic Waste

Biohazard Warning

Outline
Definition  Sources  Disposal/Control
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Outline
Definition  Sources  Disposal/Control
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What Is Hazardous Waste?
Hazardous substance  Quantity  Concentration  Characteristics (physical, chemical, infectious) increase in mortality  Increase in irreversible or incapacitating reversible illness  Pose substantial present or potential hazard to human health and the environment
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What Is Hazardous Waste? a name given to material that, when intended for disposal, meets one of two criteria: Criteria Pollutants (over 50,000 identified)  Characteristics
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Hazardous Substances
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Lead Arsenic Mercury, Metallic Vinyl Chloride Benzene Polychlorinated Biphenyls (PCB’s) Cadmium Benzo(a)pyrene Chloroform

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DDT, P’P’Aroclor 1260 Trichloroethylene Aroclor 1254 Chromium (+6) Chlordane Dibenz [a, h] anthacene Hexachlorobutadiene Dieldrin

Characteristics
Flammability  Reactivity  Corrosivity  Toxicity
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Flammable
Liquid with flash points below 600C  Easily ignited; burn vigorously and persistently
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Corrosive
Aqueous solution  Have pH values outside the range 2.0 to 12.5  Any liquid that exhibits corrosivity to steel at a rate greater than 6.35 mm per year.
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Reactive
Unstable  Can form toxic fumes or can explode
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Toxic
Bioconcentration  LD50 (less than 50 mg/kg body weight)  LC50 (less than 2 mg/kg)  Phytotoxicity
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Radioactive

Outline
Definition  Sources  Disposal/Control
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Sources
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Industrial Wastes Agricultural Wastes Household Wastes Medical Wastes

BHOPAL, India Accident

Timeline
At the plant  21:00 Workers begin water cleaning pipes.  22:00 Water enters tank 610, reaction starts.  22:30 Gases are emitted from the vent gas scrubber tower.  00:30 The large siren sounds and is turned off  00:50 The siren is heard within the plant