Study Notes on Solid Waste Management

Definition of Solid Waste

  • Non-liquid waste: includes household garbage, plastics, paper, metals, glass, organic waste, and construction debris.

  • Managed under Solid Waste Management (SWM).

  • Categorized by production sector.

Categorization of Solid Waste

  • Municipal Solid Waste

  • Industrial Waste

  • Biomedical Waste

  • Agricultural Waste

  • E-waste

  • Construction & Demolition Waste

Magnitude of the Problem

  • 2.01 billion tonnes of municipal solid waste (MSW) generated annually worldwide.

  • Over 33% is not managed environmentally safely.

Methods of Waste Disposal

  • Landfills

  • Incineration

  • Source reduction

  • Composting

  • Recycling

Landfills

  • New landfills have impermeable liners and monitoring systems for contaminants.

  • Declining number of landfills due to regulations and public resistance.

Incineration

  • Burns refuse in controlled settings (12% of U.S. MSW).

  • Reduces waste volume by 90%, weight by 75%.

  • Risks include air quality issues and ash toxicity.

Composting

  • Transforms organic waste into compost through natural decomposition.

  • Can be done on a small scale in backyards.

Source Reduction

  • Prevents waste generation by designing and reusing materials.

  • Focuses on reducing toxicity and waste at the manufacturing level.

Recycling

  • Important environmental process with about 35% of solid waste diverted from landfills (2011).

  • Deposit-refund programs incentivize recycling.

  • Mandatory recycling laws increase recycling rates in many states/cities.

Solid Waste Management in the Middle East

  • Generates 150 million tonnes of waste annually, high per capita production (1.5-2.0 kg/day).

  • Reliance on landfilling with low recycling rates (<10%).

Challenges in the Middle East

  • Low recycling rates due to cultural barriers.

  • Over 70% of waste ends in landfills.

  • Economic focus on industrial growth over sustainability.

Case Study: Qatar

  • Generates 2.5 million tonnes of waste annually (1.8 kg/day per capita).

  • Initiatives focus on domestic waste management and construction waste recycling.

  • Aims to align with Qatar's Vision 2030 for increased sustainability.

UDST Initiative: Zero-Waste Campus by 2027

  • Aims to eliminate landfill waste through sustainable strategies.

Symposium on Sustainable Organic Waste Management

  • Discussion on innovative waste management and the role of technology.

  • Focus on decentralized waste-to-compost systems.