Biodegradability of Cotton

Just as grocery store shoppers seek ingredient lists they know and understand, the textile supply chain – from manufacturers to clothing retailers and brands – is seeking answers on where its raw material comes from and how it impacts the environment. The U.S. cotton industry wants to ensure the cotton fiber is something that the industry can trust and continue to depend on when making product decisions to use cotton.

The biodegradability of raw materials – both natural and synthetic – is an important topic throughout the supply chain. With the rise of production in the fashion industry, demand for man-made fibers, like polyester, has nearly doubled in the last 15 years (Environmental Health Perspectives). The impact of fast fashion has an impact beyond the closet.

Breaking it Down: Cotton’s Biodegradability in Soil

What happens when your favorite cotton shirt finally reaches the end of its functional life? In most cases, the shirt is donated, repurposed for things such as rags around the house, or thrown away.

Did you know the average American disposes 70 pounds of textiles each year, according to the Council for Textile Recycling? If only about 10 pounds are donated, the remaining 60 pounds ends up in landfills or other disposal environments.

For many, the minute clothing and apparel leave their wardrobe whether through donation or throwaway, the garments are out of sight and out of mind. But for the garment itself, this is just a step in the process of its chemical breakdown – also referred to as biodegradation. How and when a garment biodegrades dictates how long it will sit in a landfill or other compost environments.

What you might not realize is that most polyester is made of polyethylene terephthalate, also referred to as PET and more commonly known as the main ingredient in water bottles. So if you have ditched your plastic water bottle because of its environmental impact, consider how your polyester attire fairs in landfills.

 

While nearly all materials are subject to biodegradation eventually, the rate at which materials decompose varies greatly depending on their chemical make-up. Synthetic fibers like polyester biodegrade much slower than cotton. Cotton biodegrades relatively quickly because it is made of cellulose, an organic compound that is the basis of plant cell walls and vegetable fibers.

How much faster does cotton break down?

 

Cotton Incorporated breaks down this question and others in this recorded webinar, played on March 27, 2018. Hear from Cotton Incorporated’s expert researchers as they explore recent studies on the biodegradability of the fiber in both natural and activated soil environments.

 

What about nonwovens such as wipes? The webinar explores this topic as well. With a growing consumer market for wet wipes, there is also a growing concern in the nonwovens industry about the biodegradability of these single-use wipes. Recent studies also evaluated cotton’s ability to return to nature in a composting environment as well sewer and septic systems. We’re sharing the results of these independent analyses during this webinar.

Interested in downloading the slides from this presentation? Click here.

Breaking it Down: Cotton’s Biodegradability in Water

 

Did you know apparel begins to break down in the wash?

 

Fabrics (both natural and synthetic) shed microfibers which enter into rivers, lakes, and oceans. Research shows synthetic fibers contribute to plastic pollution in the earth’s water supply by shedding microplastics into waterways when laundered. (Microfiber Pollution and the Apparel Industry and Accumulation of Microplastic on Shorelines Worldwide).

 

It is estimated that there is now a minimum of 5.25 trillion plastic particles, weighing 270,000 tons, floating in the world’s oceans (Eriksen et al. 2014).  These particles do not break down, but continue to bio-accumulate causing further harm to Earth’s marine habitats.

Cotton Incorporated and North Carolina State University teamed up to better understand how cotton biodegrades in water. The study considers the path of cotton and synthetic microfibers as they:

 

  • Shed in the wash
  • Enter waterways
  • Breakdown in water

 

A major objective of the NCSU research was to determine the degradability of various types of microfibers in a wastewater environment. The results concluded that after 243 days, cotton had 76% degradation while the polyester fibers showed 4% degradation – that’s means cotton degrades 95% more than polyester in wastewater. The research further indicates that cotton will continue to degrade overtime unlike polyester whose degradation plateaued after the time tested.

For more information about the study underway and the sustainability of cotton and synthetic microfibers in water, watch this video.

Microfibers in Water

The issue of microfiber and microplastic pollution is gaining traction with those concerned about protecting the environment. This webinar explores two specific areas:

 

  • The state of the science regarding emerging research on microfibers and the problems they pose to the natural environment.
  • Cotton’s degradation in conditions similar to a wastewater treatment plant.

 

Hear as researchers from University of California – Santa Barbara and North Carolina State University give a breakdown of the science behind this topic.

 

Watch the replay of Cotton’s Biodegradability in Aquatic Environments, which originally played on Tuesday, April 24, 2018.

Interested in downloading the slides from this aquatic webinar presentation? Click here.

How can you make a difference?

Cotton Incorporated has developed viable alternatives to synthetic microfiber fleece through the creation of cotton and cotton/wool blend fabrics designed to insulate and provide warmth, while offering a natural, biodegradable option. The natural fibers shed from these fabrics easily break down in soil and wastewater environments. Research currently shows the rapid breakdown in waste water, and more research is underway to confirm their breakdown in salt and fresh water environments.

Suppliers

Many Cotton LEADS™ partners provide various cotton/wool yarns in a range of blends and yarn counts, and can easily connect with your supply chain. Below is a list of suppliers who are currently offering cotton/wool yarn.

 

China

Company: Bros Eastern Co., Ltd.

Contact: Ms. Lau Mable

Email: cs@bros.com.hk

Telephone: 86 13925244672

Capabilities: Yarn counts finer than 20/2

 

Company: Dezhou Huayuan Eco-Technology Co., Ltd.

Contact: Mr. Li Xiangdong

Email: lixdhn@126.com

Telephone: 86 13605349831

Capabilities: Yarn counts finer than 20/2

 

Company: Qingdao Textile Group

Contact: Ms. Wang Lingling

Email: evelynwang_qd@yahoo.com

Telephone: 86 13953205646

Capabilities: Yarn counts finer than 16/2

 

Company: Ruyi Group Co., Ltd

Contact: Ms. Zhou Yanmin

Email: zym77@chinaruyi.com

Telephone: 86 13562778485

Capabilities: Counts finer than 10/1

 

Korea

Company: Dong-Il Corporation

Contact: Mr. Howard Yoo

Email: howard@dong-il.com

Telephone: 82-02-2222-3071

Capabilities: 40/1, 50% cotton/50% wool

 

Taiwan

Company: Chia Her

Contact: Mr. Richard Chen

Email: richard.chen@chgtex.com

Telephone: 886-2-2712 3998

Capabilities: Yarn count range of 16/1 – 30/1, 80% cotton/ 20% wool

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