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E-Waste Science &Technology

E-Waste Effects on theEnvironment and Humans

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Contents

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Objectives

Understand water cycle and how it can becontaminated

Understand how E-Waste contributes tocontamination

Explain the major harmful components inwaste

Demonstrate contamination processes

Comprehend effects of toxics on humans

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Outline

Environmental Effects Explain Water Cycle

How toxic substances get into the watercycle

Demonstrations and labs

Human effects Sources of hazards in E-Waste

Effects on humans

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Purpose

The field of toxicology

Industrial sources

Environmental effects (water and air)

Human Effects

Water contamination experiments

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Waste Near Water

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Hydrologic (Water) Cycle

http://www.groundwater.org/kc/gwwatercycle.html 9-15-05 The Groundwater Foundation

The water cycle

may be explained

by a circular

pattern, but water

moves randomly

among the states

in the diagram

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GroundwaterGroundwater comes

from rain, snow, sleet,

and hail that soaks into

the ground.

Water in a lake can soakdown into the ground and

become groundwater.

An area that

holds a lot ofwater which can

be pumped up

with a well is

called an aquifer

Contaminatedgroundwater can

eventually make

its way to the

water we drink

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Hydrologic Cycle-Toxicity Unit

Sources Industrial waste

Landfill Incineration

Infamous cases Love Canal

HexavalentChromium(Erin Brokavich)

Perchlorate(San Martin, CA)

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Recycling Hazards

Heavy metals (lead & cadmium in circuitboards)

Batteries containing cadmiumCathode ray tubes with lead oxide & barium

Brominated flame-retardants on printedcircuitboards, cables and plastic casing.

Poly Vinyl Chloride(PVC)-coated copper cablesand plastic computer casings

Mercury switches and flat screens

Poly Chlorinated Biphenyls (PCBs) in older

capacitors & transformers

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Hazards in Waste Streams

Hazards of throwing e-scrap into regularwaste streams

Sources and effects of major toxic materials Lead

Cadmium

Mercury

HexavalentChromium

Polyvinyl Chloride PVC

Brominated Flame Retardants

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Landfill Hazards

Leakage

Leaching

Vaporization

Particle and gas emissions (Fires)

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Incineration Hazards

Municipal incineration

is the largest point

source of dioxins intothe US and Canadian

environments and

among the largest

point source of heavy

metal contamination ofthe atmosphere.

JUST SAY NO TO E-WASTE: BACKGROUND DOCUMENT ON HAZARDS AND WASTE FROM COMPUTERS

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Contamination Mechanics

Leaching

The Plume Effect

Grinding

Incineration

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Toxocology-Human Effects

Under development