solid waste


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SOLID WASTE. Objective. Define solid waste Reduce, reuse and recycle Recycling glass Recycling paper Recycling plastic Recycling metals Discuss impacts of solid waste on terrestrial environment. What is solid waste?. - PowerPoint PPT Presentation



SOLID WASTEDefine solid wasteReduce, reuse and recycleRecycling glassRecycling paperRecycling plasticRecycling metalsDiscuss impacts of solid waste on terrestrial environmentObjective What is solid waste?Solid products or materials generated by the activity of living things or of natural origin that are disposed of, as useless unwanted substances.

Commercial wasteConstruction wasteHospital wasteDomestic wasteTypes of WasteSolid Waste Management

Solid waste management is a system for handling all of the garbage produced.

Before industrialization, solid waste was made up of mostly biodegradable materials. And was recycled in the soil.

However, modern societies generate far more solid waste than early humans ever did.

Larger amounts of non-biodegradable materials are now produced.

In order to maintain a healthy environment the large sums of garbage produced can be controlled by following the 3 Rs

REDUCE, RESUE AND RECYCLEREDUCEDefinition: To lessen the amount of items consumed and discarded.

Reducing involves;Purchasing items that are produced using minimum amount of raw materials.Using items that have longer life.Items that can be used several times.REUSEDefinition: To extend the life of an item beyond its original use, instead of discarding it.

Reusing involves;Using empty jars and bottles as storage containers.Repairing items that are broken or damaged.Donating old clothes, toys, magazines, etc. to charity.RECYCLINGDefinition: Is the processing of discarded old items to produce useful products.

Recycling involves;Conserving raw materials and energy.Reducing the amount of material going into landfills.Lessens the pollution that may result from waste disposalRECYCLING GLASSSteps In The Recycling Glass Process

Glass bottles are collected at recycling centers.

Bottles are then cleaned and separated by colour.

Glass is then crushed in a processor; the crushed class is called the cullet

*NOTE: A magnet is passed over cullet to remove any metal such as bottle caps

CULLETCOLLECTED GLASSThe cullet is place into a furnace; where it becomes molten.

Soda ash, sand and limestone are added to the molten cullet; to form molten glass.

This molten glass can now be molded or blown into new glass materials.


Glass can be recycled repeatedly without loosing its quality.

Soda ash, limestone and sand are cheap raw materials, that saves about half the energy required when making glass from all new materialsAbout Glass RecyclingOther glass objects such as light bulbs, ceramics, mirrors; can not be recycled with bottles as they are composed of different materials.

Neither can coloured glass be recycled with clear glass.

Recycling Paper

1) Collection2) sorted

3) Pulper with water

Pulp slurry

4) screening

5) De-inking

6) compression

20-30 trees are saved for every one ton (2 000 lbs) of paper recycledCan only be recycled 5-7 timesNew wood is often mixed in pulp slurryAbout Paper


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