Solid and hazardous waste 7

Solid and Hazardous Waste Overview

  • Presented by Linchen He, Assistant Professor, Lehigh University.

Type of Waste

  • Waste is categorized based on its type and how it is managed.

  • There are strategies to deal with solid waste management.

Definition of Waste

  • Waste is defined as a material without value.

  • The judgment of a material's value is subjective and can vary with time.

  • "One person’s waste may be another person’s treasure."

Laws and Policy in the U.S.

  • The Resource Conservation and Recovery Act (RCRA) enacted in 1976 grants the EPA authority over solid and hazardous waste management.

  • Hazardous waste management requires tracking from generation to disposal.

  • Solid waste landfills must have liner systems to prevent contamination of aquifers.

Types of Waste

  • Food Waste: Generated from households and food production processes.

  • Municipal Solid Waste (MSW): General waste from households.

  • Special Waste: Includes medical waste, e-waste, construction waste, etc.

  • Hazardous Waste: Waste that poses significant risk to health or environment.

Food Waste in the Food System

  • Food waste is a complex system of inputs (fertilizers, energy, water) and outputs (food, contamination, greenhouse gases, waste).

  • Important factors include production, distribution, and waste management.

Waste from Industrial Food Animal Production

  • Over 9 billion food animals are slaughtered annually in the U.S.

  • Industrial animal production results in more than 300 million tons of dry waste yearly, far exceeding human solid waste.

  • Regulatory standards for human waste treatment do not apply to animal manure, leading to environmental contamination.

Environmental Impacts of Wasted Food

  • Wasted food leads to significant resource wastage, accounting for 35% of North America's freshwater, and substantial levels of cropland and fertilizer use.

  • Globally, food waste emits greenhouse gases, ranking it as the #3 emitter after China and the U.S.

Municipal Solid Waste (MSW) Statistics

  • In 2013, total MSW generation in the U.S. reached 254 million tons.

  • Annual per capita waste generation is tracked and varying rates of production exist.

Special Waste Categories

  • Types of special waste include:

    • Medical waste

    • Construction waste

    • Asbestos

    • Mining, agricultural, radioactive, and electronic waste.

Medical Waste

  • Medical waste consists of materials like soiled bandages, used needles, and culture dishes.

  • It poses infection risks and is incinerated to ensure safe disposal.

Asbestos

  • Asbestos types include chrysotile, amosite, crocidolite, anthophyllite, actinolite, and tremolite.

  • Historically used for fire-resistant properties until linked with health risks.

Health Risks of Asbestos

  • Asbestos exposure can lead to serious diseases including mesothelioma and asbestosis.

  • Symptoms may take years to appear and can lead to severe respiratory complications.

Radioactive Waste

  • Contains materials with radioactive properties, categorized into low-level and high-level waste.

  • Disposal methods for high-level waste remain controversial and often involves temporary storage.

E-Waste

  • Includes discarded electronic devices, which are rapidly increasing as a waste type.

  • E-waste comprises about 1% of U.S. MSW and is primarily disposed of in landfills.

Concerns with E-Waste

  • E-waste contains hazardous metals like lead and mercury, leading to environmental contamination if not properly managed.

  • Health impacts from improper disposal include cancer and damage to various body systems.

Management of E-Waste

  • Strategies include reusing, recycling, and proper disposal to minimize hazards.

  • Avoiding exportation for extraction of valuable materials is crucial for safety.

Solid Waste Management Strategies

  • Emphasizes waste avoidance and reduction as primary strategies.

  • Proper handling and disposal methods aim to reduce health and environmental impacts.

Sanitary Landfills vs Incineration

  • Modern landfills utilize technologies to manage leachate and monitor groundwater.

  • Incineration is a method of controlled waste combustion, facing challenges like air pollutant release and community impact from emissions.

Summary of Solid/Hazardous Waste

  • Modern lifestyles produce significant volumes of waste, including food waste that exacerbates environmental issues.

  • The need for reduction, reuse, and recycling is critical to lessening public health and ecological impacts.

  • Advancements in industrial processes and waste treatment technologies are essential for future waste management.