7.3 Solid Waste Management

Guiding Question

• How can societies sustainably manage waste?

Understandings

1. The use of natural resources generates waste, which can be classified by source or type.

   • Classification helps in understanding the origin and nature of waste for effective management.

2. Solid domestic waste (SDW) typically has diverse content.

   • SDW can include paper, organic materials, plastics, e-waste, etc.

3. The volume and composition of waste vary over time and between societies due to various factors:

   • Socio-economic, political, environmental, and technological factors.

4. The production, treatment, and management of waste can have environmental and social impacts, which may be experienced far from the waste's origin.

   • This emphasizes the global nature of waste management challenges.

5. Ecosystems can absorb some waste, but pollution occurs when harmful substances are added faster than they are transformed into harmless substances.

   • Understanding the limits of natural systems is essential for sustainable practices.

6. Preventative strategies for waste management are generally more sustainable than restorative strategies.

   • Preventative strategies focus on reducing waste generation from the outset.

7. Different waste disposal options have varying advantages and disadvantages regarding their impact on societies and ecosystems.

   • It’s crucial to evaluate disposal methods for environmental effects.

8. Sustainable options for managing SDW can be promoted in societies.

   • Awareness and policy changes can support sustainable practices.

9. The principles of a circular economy provide a holistic perspective on sustainable waste management.

   • Circular economy principles advocate for resource recirculation and minimizing waste generation.

Connections

• Relevant subtopics include 1.1, 1.2, 1.3, and HL.b regarding natural resources and waste management.

Natural Resources and Waste

• UN Sustainable Development Goal (SDG) 12 states:

  • If the global population reaches 9.8 billion by 2050, three planets worth of resources will be needed to sustain current lifestyles.

  • In 2015, approximately 12 tonnes of resources were extracted per person, with electronic waste as the fastest-growing sector.

  • Since the early 20th century, industrialized countries have wasted about 30% of the natural resources they extract or harvest.

Issues Related to Overexploitation of Natural Resources

• Overreliance on non-renewable resources (e.g., fossil fuels) leads to:

  • Resource depletion, environmental pollution, irreversible changes to ecosystems, loss of biodiversity, and social conflict.

Classification of Waste

• Major types of waste:

  • Liquid: Includes wastewater.

  • Solid: Comprises various materials discarded from households, industries, and agriculture.

  • Organic: Includes food waste and other biodegradable materials.

  • Recyclable: Materials that can be processed and reused.

  • Hazardous: Materials that can pose a risk to health and the environment.

• Origins of Waste:

  • Households: Domestic waste from daily activities.

  • Industry: Non-usable materials from manufacturing processes.

  • Agriculture: Unwanted or unsaleable produce.

  • E-waste: Varied components like plugs, monitors, and computers.

  • Biohazardous Waste: Potentially infectious materials.

Linear vs. Circular Economic Thinking

• The "take, make, waste" concept indicates unsustainable practices driven by linear thinking, which must be shifted to a circular economy approach.

Solid Domestic Waste (SDW)

• Definition: Rubbish from residential and urban areas, including various materials such as paper, packaging, food waste, e-waste, metals, plastics, and more.

• Composition of SDW is significant; while it comprises around 5% of total waste including agricultural and industrial waste, it is controllable by individuals.

Global Waste Generation Highlights

• According to a 2018 World Bank report:

  • The world generates an average of $0.74$ kg of waste per capita daily.

  • This rate varies between $0.11$ kg and $4.54$ kg per capita per day depending on the country.

  • An estimated $2.01$ billion tonnes of municipal solid waste were generated in 2016, expected to grow to $3.40$ billion tonnes by 2050 at current rates.

  • The East Asia and Pacific region generates the most waste globally (23%), while the Middle East and North Africa produce the least (6%).

Recycling Rates and Waste Management Practices

• Regional recyclable fractions vary:

  • LICs recycle around 16% (paper, cardboard, plastics, etc.) compared to about 50% in HICs.

Challenges in Waste Management

1. Volume Management: 33% of SDW annually is not managed safely for the environment.

2. Geographical Disparities: Waste management effectiveness varies significantly across countries.

Current Waste Disposal Methods

• Options include:

  • Recycling (3Rs): Reduce, Reuse, Recycle; increasingly recognized as necessary to manage waste.

  • Composting organic waste to add nutrients back into the soil.

  • Landfills: Emerging concern for long-term sustainability due to pollution risks.

  • Waste-to-energy schemes that use burning waste to generate power.

  • Incineration: Involves burning waste, producing ash and potential pollution.

  • Exporting waste to other countries for disposal or recycling, which raises ethical concerns.

  • Anaerobic digestion for organic waste.

Waste Management Strategies

• Preventing Waste Generation: The “3Rs” have evolved into more suggestions like Refuse, Rethink, Repurpose, Repair, Recover, and Refurbish.

  • Key actions include adopting minimalist consumption habits and reducing unnecessary purchases.

• Recycling: Systems can vary from region to region, with countries like Germany implementing strict recycling regulations.

Case Studies on Waste Disposal and Recycling

• Germany: Utilizes multiple recycling bins to segregate waste for recycling effectively, thus enhancing community participation.

• Plastic Waste: The production and disposal of plastics highlight serious environmental concerns; awareness campaigns and regulations like bans and taxes help reduce plastic use.

• Landfills: Feature proper management to mitigate environmental impacts; include stringent laws governing their operation.

• Incineration: Offers both advantages (reducing waste volume and producing energy) and disadvantages (releasing pollutants).

Circular Economy Approach

• Definition: A circular model aims to maintain resources in use for as long as possible, maximizing their value while minimizing waste and negative environmental impacts.

• Principles include designing products to last longer, focusing on renewable energy, and recycling and reusing materials rather than disposal.

Ethical Considerations in Waste Management

• Balancing economic growth and environmental protection requires careful consideration; policymakers face challenges in selecting waste management strategies focusing on sustainability.

International Trade in Waste

• Global waste trade primarily flows from HICs to LICs, creating both economic opportunities and significant environmental challenges for the receiving countries. Issues include illegal dumping and inadequate recycling processes.

Conclusion

• Addressing waste management sustainably requires collaboration across sectors: governmental policies, public engagement, technological advancements, and commitment to circular economy principles to redefine the interaction with waste and resources effectively.