HOW LONG DO COMPOSTABLE GARBAGE BAGS TAKE TO DECOMPOSE?

How Long Do Compostable Garbage Bags Take to Decompose?

How Long Do Compostable Garbage Bags Take to Decompose?

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In the age of rising environmental awareness, more people are turning to compostable garbage bags as a greener alternative to traditional plastic waste solutions. But a common question still lingers: How long do compostable garbage bags take to decompose? The answer depends on several factors, including the bag material, environmental conditions, and where the composting process takes place.

This blog breaks down the timeline and science behind compostable bag decomposition while comparing them with bio degradable garbage bags and green garbage bags to help you make informed, eco-conscious decisions.

What Are Compostable Garbage Bags?


Compostable garbage bags are made from plant-based materials like cornstarch, cassava starch, PLA (polylactic acid), and PBAT (polybutylene adipate terephthalate). These materials break down into non-toxic, natural elements under composting conditions, leaving behind no harmful residue or microplastics.

Unlike traditional plastic bags, which can take hundreds of years to break down, compostable bags are designed to decompose quickly in the right environment.

 

Compostable vs. Biodegradable vs. Green Garbage Bags


Before diving into decomposition times, it’s important to understand the distinction:

  • Compostable Bags: Break down fully in a composting environment into water, CO₂, and biomass without leaving toxic residue.

  • Bio Degradable Garbage Bags: Made to break down over time but may still leave microplastics or toxic chemicals behind.

  • Green Garbage Bags: Often a generic term; they may be biodegradable or compostable, but it's best to check certifications.


Average Decomposition Time for Compostable Garbage Bags


The time it takes for a compostable garbage bag to decompose varies based on several factors:

1. Industrial Composting Conditions



  • Time: 90 to 180 days (3 to 6 months)

  • Conditions: High heat (above 55°C), controlled humidity, active microbial environment

  • Notes: This is the ideal scenario and often required for commercial compostable certification (e.g., EN 13432, ASTM D6400).


2. Home Composting Conditions



  • Time: 6 months to 1 year

  • Conditions: Lower temperatures, natural microbes, varied moisture levels

  • Notes: Some compostable bags are not suitable for home composting; check for "Home Compostable" label.


3. Landfill Conditions



  • Time: Indefinite (can be similar to plastic)

  • Conditions: Low oxygen, limited microbial activity

  • Notes: Compostable bags may not decompose efficiently in landfills. Proper disposal is crucial.


Factors That Affect Decomposition Time


Several variables influence how fast compostable garbage bags break down:

  • Material Composition: Bags made from pure PLA or PBAT may take longer than those made from starch blends.

  • Composting Conditions: Aeration, moisture, and temperature all play key roles.

  • Thickness of the Bag: Thicker bags take more time to break down.

  • Microbial Activity: The presence of fungi and bacteria accelerates decomposition.


Certification to Look For


To ensure your green garbage bags are genuinely compostable, look for these certifications:

  • ASTM D6400 (USA)

  • EN 13432 (Europe)

  • IS/ISO 17088 (India)


Benefits of Using Compostable Garbage Bags



  • Reduce landfill waste

  • Support zero-waste living

  • No toxic residue or microplastics

  • Safe for composting organic waste

  • Environmentally superior to bio degradable garbage bag alternatives


Proper Disposal Guidelines


To maximize the benefits of compostable garbage bags, follow these tips:

  • Dispose of them in composting bins, not regular trash.

  • Use for organic, compostable kitchen waste only.

  • Store in a cool, dry place to prevent premature breakdown.

  • Never mix with plastic bags – it contaminates the compost.


Final Thoughts


So, how long do compostable garbage bags take to decompose? In ideal industrial conditions, 3 to 6 months. In home composting, it may take up to a year. But if sent to landfills, even these eco-friendly heroes can struggle to break down.

By choosing certified compostable garbage bags over traditional or bio degradable garbage bags, and using them responsibly, you're taking an important step toward reducing your environmental footprint.

Next time you shop for green garbage bags, read the label, check the certification, and compost the smart way.

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