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June 8, 2007

How long does it take for items to bio-degrade?

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Today through my daily research and surfing, i came across a good article on biodegradability, and just exactly what is the meaning of this commonly used word. The author states several questions should be asked when trying to label a product as biodegradable. Questions such as:

  • inherent biodegradability of the material?
  • how long it takes for the material to actually break down?
  • what exactly does the product or material break down into?

The issue that resonates with most Americans is the last factor for biodegradability which is, “the characteristics of the environment that the substance or material is in”, the author poses another question, “should a product be called biodegradable if it inherently has the ability to biodegrade, or should it only be called biodegradable if it also is commonly disposed of in a way in which it really will biodegrade? For example, should a paper grocery bag be labeled biodegradable? It will biodegrade if placed in nature, however it won’t biodegrade in a landfill because the conditions aren’t right”.

Here’s how long it takes for commonly used products to biodegrade, when they are scattered as litter:

cotton rags 1-5 months

paper 2-5 months

rope 3-14 months

orange peels 6 months

wool socks 1 to 5 years

cigarette butts 1 to 12 years

plastic coated paper milk cartons 5 years

leather shoes 25 to 40 years

nylon fabric 30 to 40 years

tin cans 50 to 100 years

aluminum cans 80 to 100 years

plastic 6-pack shower holder rings 450 years

glass bottles 1 million years

plastic bottles forever

This article does a good job of explaining the nature of where we find ourselves today, as far as the problems we are having with waste and landfills.
For an insightful read on this topic, visit the full article at World Wise. , , , , , , , , , , , , , , , ,

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Does this refer to a modern sanitary landfill? Or simply dumped garbage?

A modern landfill is a complicated process designed to accelerate the process.

Comment by Dwindle — June 8, 2007 @ 6:53 pm

great post! it does make me wonder what would happen when we run out of land to fill up our trash.

Comment by Susie — June 8, 2007 @ 7:13 pm

Hi–Dwindle: Thanxs for dropping by, the article doesn’t necessarily specify which type of landfill it refers to, but i doubt that a modern landfill speeds the process much from 1 million years, say for the “glass bottles”. I’m all ears to any other details on this topic. Thanxs.

Hi—Susie: I wonder myself what is the future of our landfills.

Comment by Missy — June 8, 2007 @ 7:25 pm

You know, there’s an island in Korea that’s made up of landfill. Well they had landfill that started producing natural gas so now they have all kinds of plants growing. They even got a soccer stadium and a golf course on that landfill island. Let me see if I can find more detailed info…

Comment by max — June 8, 2007 @ 7:29 pm

Well, the bottle would have long since been crushed - it’s the plastic I’m wondering about. Essentially, the garbage is ripped apart by construction vehicles with metal wheels about 8 feet wide and 14 feet high, with giant cleats that look like a meat hammer, each about the size of a microwave. Bulldozers continuously mix the garbage, and this process extends for a month while the sun and air (not to mention thousands of seagulls) degrade the trash. It is then buried with soaker hoses which continuously add water and air to the pile for two years. It is then dug up, mixed around again, and buried for another ten. The finished product is used as fill for construction. Some more modern landfills simply shred the garbage as it comes in.

One construction project involved dumping 400,000 truckloads of this fill into a valley over the course of 3 years. They then plowed the surrounding hills into it, and created a 3 square mile plot of flat land - in a place where flat lands don’t exist. In theory, the garbage shouldn’t degrade further to ever sink again, and suposedly the fill is clean enough to not contaminate the groundwater, as the new houses have individual wells about 300 feet deep.

Comment by Dwindle — June 10, 2007 @ 7:27 am

I’ve always felt prisoners should sort trash for a living. The consumer should have only two kinds of trash, one for biodegradables, one for everything else. The food garbage could be ground and used as fertilizer, and the rest could be sorted by prisoners for recyclables. You would then be left only with things that are not biodegradable nor recyclable. Even non recyclable plastic can be melted together and used as building materials.

The electricity wasted by the production of aluminum is disturbing.

The advantage to the prisoner idea is, you could have them working in three shifts around the clock, meaning only two thirds of the prisoners would be in the jail at any given time - enhancing their capacity by 33%.

Comment by Dwindle — June 10, 2007 @ 7:35 am

I just stumbled on your page on StumbleUpon.. :) great to see you guys on here.

Comment by Susie — June 25, 2007 @ 9:56 am

I feel like I struggle with this topic every day. I recycle everything that can be recycled and feel badly that there are some things that have to go into the landfill.

What really upset me was reading about the giant mass of garbage floating in the N. Pacific that is about twice the size of Texas. We are the laziest bunch of humans ever imagined. I am amazed at how little responsibility many of us feel for this small planet of ours.

Comment by Marilyn — June 27, 2007 @ 7:07 am

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