Notes on Solid Waste Generation and Disposal

Overview of Solid Waste Generation and Disposal

  • Solid waste comprises the materials that are disposed of and cannot be used by other organisms.
  • The need to manage solid waste is central to environmental science and public health.

Waste Generation Statistics in NYC

  • 14 million tons of trash produced annually in New York City.

Types and Composition of Waste

  • Waste Definition: Anything produced that is unconsumed or not useful.
  • Municipal Solid Waste (MSW): Refuse from households and institutions, including schools, hospitals, and businesses.

Breakdown of MSW by Composition

  • Paper: 31%
  • Organic materials (yard waste, food scraps, wood): 33%
  • Nondurable goods: 25%
  • Durable goods (appliances, tires): 18%
  • Plastics: 12%
  • Metals: 8%
  • Glass: 5%
  • Other: 3%

Electronic Waste (E-Waste)

  • Definition: E-waste comprises electronic products like TVs and computers that contain hazardous materials.
  • Recycling Rates: Less than 20% of e-waste is recycled in the U.S.
  • Health Risks: Toxic exposures can occur in countries receiving exported e-waste.

The Three R's of Waste Management

  • Reduce: Minimize waste creation through practices like using both sides of paper and avoiding excessive packaging.
  • Reuse: Use items multiple times, e.g., refillable bottles.
  • Recycle: Convert waste into new materials; should be the last resort.

Composting

  • Definition: Organic material that decomposes into nutrient-rich substance under controlled conditions.
  • Process: Involves collecting organic waste, separating compostable materials, and curing them for use.

Landfills and their Management

  • Landfills vs. Open Dumps: Sanitary landfills are engineered for minimal environmental impact while open dumps are unregulated.
  • Components of a Sanitary Landfill:
    • Clay liner and Leachate collection systems to manage contaminated water.
  • Environmental Concerns: Leachate can pollute groundwater.
  • Tipping Fees: May cost around $72.00 per ton, promoting recycling efforts.

Incineration

  • Definition: Burn waste to reduce volume; may generate heat/electricity.
  • Issues: Higher costs, potential air pollution, toxic ash disposal, and NIMBY (not-in-my-backyard) reactions to establishment.
  • Incineration statistics in NYC: 25% of non-recyclable waste incinerated.

Hazardous Waste

  • Definition: Waste damaging to human health/economies; includes industrial waste and certain munitions.
  • Handling: Requires special disposal methods as specified by laws like the RCRA (Resource Conservation and Recovery Act).

Legislative Framework for Waste Management

  • RCRA (1976): Enacts measures to minimize hazardous waste generation.
  • CERCLA (Superfund Act, 1980): Focused on cleaning up hazardous waste sites, following registration of concerns.

Integrated Waste Management (IWM)

  • Concept: Comprehensive approach combining source reduction, recycling, composting, landfilling, and incineration.
  • Eco-friendly Strategies: Encourages reduction at the source and scrutinizes waste lifecycle.

Review Questions

  1. Define waste and its unique characteristics in human-generated waste.
  2. What are the sources and types of waste?
  3. Explain the three Rs with examples.
  4. Describe the purpose of compost and its benefits.
  5. What occurs to most solid waste today, and how do landfills differ from open dumps?
  6. Analyze the advantages and disadvantages of incineration as a waste disposal strategy.
  7. Outline key provisions of RCRA and CERCLA.
  8. What role does IWM play in modern waste management?