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Waste Management

Waste Management . Obj - Discuss sources and types of waste. Waste Disposal. Solid waste disposal is a problem in this country It is considered by some to be the most pressing environmental problem . Solid Waste Sources . Solid waste: non-liquid, non-soluble materials

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Waste Management

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  1. Waste Management Obj- Discuss sources and types of waste.

  2. Waste Disposal • Solid waste disposal is a problem in this country • It is considered by some to be the most pressing environmental problem

  3. Solid Waste Sources • Solid waste: non-liquid, non-soluble materials • Industrial solid waste • Primarily spoilage from mining (largest producer), logging, and other industrial processes • Municipal solid waste (MSW) • Less quantity than industrial waste, but larger problem • Amount generated doubled between 1960-2000 • Paper is the largest amount • USA generates more than any country

  4. Types of Solid Waste • Hazardous: waste, that if there is enough, poses a threat to human life, human health, or the environment • Radioactive: waste that is contaminated with any radioactive material • Non-hazardous: all other wastes not meeting the definitions of hazardous or radioactive

  5. Waste & Society • As the population increases, the role of waste management becomes more critical • Industries and municipalities must continue to develop safe and effective ways of waste disposal

  6. Waste Management & Disposal Objective- Evaluate methods of waste management & disposal

  7. Disposal of Solid Waste • Traditionally, waste was buried in a pit or just left in the open • Studies have shown that this was not an acceptable solution • When water percolates through the waste, it picks up contamination • As water passes through, it becomes what is called leachate, which can flow out of the waste and into streams or into the groundwater • A landfill is an open area into which garbage is placed and is covered with some other material usually soil

  8. Landfill Design Natural Attenuation • Designed to hold waste material in a covered area, allow natural percolation or precipitation to pass through the waste and flow through the underlying soil & rocks • Concept=leachate will be attenuated (neutralized by soil microorganisms and soil particles) • Safe for paper products and yard waste • Attenuation works by 6 natural mechanisms: adsorption, biological removal, ion exchange, dilution, filtration, chemical precipitation

  9. Landfill Design Containment Landfill • Designed to minimize seepage of leachate into the surrounding soil and groundwater • Most containment landfills minimize leachate, but there is still some leachate • A total containment landfill is used for hazardous waste and allows no seepage • Generally, containment landfills have a liner to restrict water from percolating in a natural way • Often, collection pipes are used to capture and drain the seepage before it reaches the liner. This leachate is then collected and treated in a wastewater treatment plant. • Best way to handle the majority of MSW • More expensive to build

  10. Recycling of Waste • Argument: Recycling reduces the need for expensive landfills • Natural resources are not really benefited in any substantial way by recycling. • There is no real shortage of energy sources or trees for paper • The cost of solid waste disposal is the primary reason for recycling

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