Waste
Overview
Waste refers collectively to materials that are unnecessary or have lost their use value, generated from human daily life and production activities. In modern society, the amount of waste has surged due to industrialization and increased consumption, leading to serious environmental problems such as soil, water, and air pollution, ecosystem destruction, and climate change. Proper waste treatment and resource circulation have emerged as core tasks for sustainable development.
Main Content
Classification of Waste
Waste is classified in various ways according to source, characteristics, and treatment method. It is generally divided into household waste (from homes and commerce), industrial waste (from industry and construction), and specific waste (medical and hazardous). It is also categorized based on recyclability into general waste, recyclables, food waste, and bulky waste. Classification by material—such as plastic, paper, glass, metal, and organic matter—is also important.
Waste Treatment Methods
- Landfill: The most traditional method, burying waste in the ground. It poses problems of leachate and methane gas generation, and securing landfill sites is difficult.
- Incineration: A method of burning waste using heat, which can reduce volume by over 90%, but raises concerns about the release of harmful substances like dioxins. Recently, resource recovery facilities that utilize incineration heat for power generation have been expanding.
- Recycling: Separately discharged waste is processed and used as raw material for new products. It is effective in saving resources and reducing environmental burden, but issues include contamination with pollutants and economic feasibility.
- Composting: Organic waste such as food waste is decomposed by microorganisms to produce compost. It has soil improvement benefits, but drawbacks include odor and processing time.
- Energy Recovery: Electricity or heat is produced using incineration heat, landfill gas, or biogas. Waste-to-Energy (WtE) technology is gaining attention.
Environmental Impact of Waste Problems
If waste is not properly treated, soil and groundwater become contaminated, and marine waste is fatal to marine life. In particular, microplastics can affect the human body through the food chain. Methane gas from landfills has a greenhouse effect 25 times that of carbon dioxide, accelerating climate change. Air pollutants from incineration can cause respiratory diseases.
Waste Reduction and Resource Circulation
To fundamentally solve waste problems, the '3R' principle (Reduce, Reuse, Recycle) is emphasized. At the production stage, excessive packaging should be reduced; at the consumption stage, the use of disposable items should be avoided; and at the disposal stage, thorough separate discharge is necessary. Recently, the concept of a Circular Economy has spread, introducing systems that ensure resources circulate from product design to disposal.
Domestic and International Waste Management Policies
South Korea implemented a volume-based waste fee system in 1995, successfully reducing waste output. A volume-based food waste fee system was introduced in 2013, and a deposit system for disposable cups has been piloted since 2022. The European Union (EU) has set a goal to make all plastic packaging recyclable by 2030. Japan has developed advanced incineration facilities, and Germany boasts a high recycling rate (approximately 65%).
Latest Trends
As of 2024-2025, the following changes are prominent in the waste sector. First, the plastic waste problem has emerged as an international agenda, with negotiations for the UN Global Plastics Treaty underway. Second, smart waste sorting systems using artificial intelligence (AI) and robots are being commercialized, improving recycling efficiency. Third, technology for producing bioplastics from food waste is advancing. Fourth, the Zero Waste movement is spreading globally, increasing the number of packaging-free stores and reusable container systems. In South Korea, the deposit system for disposable cups is scheduled to expand nationwide from 2025, and obligations to reduce greenhouse gas emissions from waste treatment facilities are being strengthened to achieve carbon neutrality.
Related Topics
- [[Environmental Pollution]]
- [[Recycling]]
- [[Plastic]]
- [[Circular Economy]]
- [[Climate Change]]
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