Biodegradable waste: What You Need to Know
When I say ‘Biodegradable Waste’ what’s the first thing that comes to your mind?
Al and fill with overflowing waste right?
In the current scenario, where overflowing landfills, polluted water bodies, and the increasing need for environmental sustainability are a pressing concern, waste management has become a critical issue.
Urban India produces about 42.0 million tons of municipal solid waste every year which means around 1.15 lakh metric tons of waste is generated per day. Out of this majority of the waste i.e. somewhere around 50-60 per cent is biodegradable.
Despite having the infrastructure to turn this waste towards composting and Bio-methanization 80-90% of this waste is directly dumped into landfills without being treated.
While there are multiple types of waste some can be recycled while some can be decomposed, biodegradable waste can be the easiest to manage yet poses a high risk if not treated and managed properly, emitting millions of tons of GHGs into the environment. Therefore, we need to understand what exactly is biodegradable waste, and why is it essential to manage it effectively.
What Does Biodegradable Mean?
The term "biodegradable" simply means substances that can be broken down or decomposed biologically or naturally by living organisms into simpler and harmless compounds over time. Unlike non-biodegradable materials like plastics, which can stay in the environment for hundreds of years, biodegradable waste can decompose relatively quickly.
Different Types of Biodegradable Waste
Biodegradable waste consists of a wide range of organic materials, including:
- Food waste: Leftover food scraps, fruits and vegetables, coffee grounds, etc.
- Yard waste: Grass clippings, leaves, branches, and other garden debris.
- Paper and cardboard: Used paper products, cardboard packaging, newspapers, etc.
- Biodegradable plastics: Certain types of plastics made from natural materials like cornstarchor sugarcane can degrade over time.
Biodegradable Waste Management: A Necessity
While the biodegradable waste can decompose over time and can be converted in to manure and compost if not managed correctly can emit tons of emissions into the environment. If not treated properly the biodegradable waste also disrupts the quality of life surrounding the landfills it is dumped into.
While we have the feasible infrastructure to turn this waste into gold and avoidemitting GHGs into the environment landfills like the Ghazipur landfill in Delhi, the Deonar landfill in Mumbai and Bengaluru's Mitaganahalli land fill highlight the concern for managing this waste properly.
The process of Biodegradable Waste Management involves a thorough process of collection, handling, treatment, and disposal of organic materials that can decompose naturally.
Benefits of Biodegradable Waste Management
The benefits of managing biodegradable waste effectively are numerous:
Reduced Environmental Pollution: Proper management of biodegradable waste minimizes the release of harmful pollutants into the environment, such as methane.
- Resource Conservation: Recycling organic waste through composting or anaerobic digestion helps conserve valuable nutrients and organic matter, which can be returned to the soil as natural fertilizers.
- Energy Generation: Anaerobic digestion of biodegradable waste can produce renewable energy in the form of biogas, which can be used for electricity generation or as a clean fuel for cooking and heating.
- Economic Opportunities: The recycling and treatment of biodegradable waste create jobs in the waste management sector and stimulate economic growth by producing compost, biogas, and other valuable by-products.
How to Reduce Biodegradable Waste:
Although ways like anaerobic digestion can be fruitful in managing the Biodegradable waste at a large scale every individual needs to understand their responsibility towards the environment and consider reducing or treating the waste at their homes, and offices to ease the burden on the environment. Following are some ways to manage waste at an individual level.
- Reducing the consumption: Limit the purchase of disposable products or products with bulky packaging
- Re-use products: Use reusable bottles, grocery bags, or other products for the same function
- Recycling: Reintroduce waste materials into the production cycle as raw materials
- Composting: A simple and cheap process that turns organic waste into nutrient-rich soil
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Biogas Production: Turning Waste into Energy
One of the key processes in biodegradable waste management is biogas production through anaerobic digestion or bio-methanization. Anaerobic digestion is a natural biological process in which microorganisms break down organic matter in the absence of oxygen, producing biogas as a by-product. The Biogas received is primarily composed of methane and carbon dioxide, with small amounts of other gases such as hydrogen sulfide and ammonia.
The process of biogas production involves the following steps:
- Feedstock Preparation: Biodegradable waste materials such as food scraps, agricultural residues, and animal manure are collected and prepared for digestion.
- Anaerobic Digestion: The prepared feedstock is placed in an airtight digester tank, where anaerobic bacteria break down the organic matter into biogas and digestate.
- Biogas Collection: The biogas produced during digestion is collected and stored in agas holder or storage tank.
- Utilization: The biogas obtained from the process of bio-methanization can be used as a renewable energy source for various applications, which include electricity generation, heating, and cooking. Also, the digestate remaining after digestion can be used as a nutrient-rich fertilizer.
Challenges in Managing Biodegradable Waste
Despite its environmental benefits, managing biodegradable waste poses several challenges:
- Contamination: Improper segregation and contamination of biodegradable waste with non-biodegradable materials can hinder the composting process and reduce the quality of recycled products.
- Infrastructure: Inadequate infrastructure and facilities for waste collection, and handling limit the scalability and efficiency of biodegradable waste management systems.
- Awareness and Education: Lack of public awareness and education about the importance of separating organic waste and participating in recycling programs can hinder the participation of the citizens in the walk towards sustainability.
Conclusion
Biodegradable waste management has immense potential for addressing environmental challenges and promoting sustainability. By adopting efficient waste management practices, such as composting, an aerobic digestion, and recycling, we can minimize waste generation, conserve resources, and reduce our environmental footprint. However, effective management of biodegradable waste requires collaborative efforts from government agencies, businesses, communities, and citizens. By working together, we can harness the power of biodegradable waste as a sustainable solution for a cleaner, greener future.
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