Materials & Assembly

Biofase Makes Bioplastic From Avocado Pits

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Dave Palmer
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Re: That's a lot of guacamole
Dave Palmer   1/22/2013 8:07:57 PM
@TJ McDermott: Mexico produces about 1.3 million metric tons of avocados per year, so 30,000 metric tons per month of seeds (360,000 metric tons per year) being disposed of by industry seems reasonable.

Avocados are either sold whole (in which case the industry isn't responsible for disposing of the seeds), or else processed into other products (guacamole, avocado oil, etc.).

I'm going to guestimate that about 75% of the weight of an avocado is contained in the seed.  That would mean that 1.3 million metric tons of avocados (i.e. the entire annual crop) yields 975,000 metric tons of seeds.

If industry has to dispose of 360,000 metric tons of seeds per year, that means that about 40% of the avocados are processed, and 60% are being sold as primary product (whole avocados).  That makes sense to me.

1.3 million metric tons is about 4.3 billion avocados -- which sounds like a lot -- but if we assume that all Mexican avocados are consumed either in the U.S. or Mexico (combined population about 430 million), that's only 10 avocados per person per year (or 6, if you only don't count processed avocados).

Each member of my family eats at least one avocado per week, so we're definitely exceeding our quota.

Ann R. Thryft
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Re: Unique process for each material?
Ann R. Thryft   1/22/2013 4:05:59 PM
TJ, the answer is kind of yes and no, depending on what part of the process you mean. It's the front end where things are really different, depending on what the feedstock is and whether it's starch-based or cellulose-based (or yet others). Once you've figured out how to convert it into ethanol you're home free. But that conversion is different for different feedstocks, depending on, among other things, the monomer, which is why Biofase wants to find other feedstock candidates with the same monomer so they can use their process on it. And the conversion can contain multiple steps--or not. There are lots of research efforts afoot to simplify that front-end process. If there's a holy grail, it might be there.

Ann R. Thryft
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Re: still recyclable?
Ann R. Thryft   1/22/2013 11:52:08 AM
All good questions, Clint. None of the Biofase-specific answers are immediately available on Biofase's website. I looked for such information--after using Google Translate, but this effort is quite new: the company was started early last year. I hope they publish a paper on the subject soon. Regarding compostability and recycling: most participants in the bioplastic industry say that recycling is the first "best use", and compostability comes second. Making a bioplastic compostable is usually aimed at food-service or other single-use items--as Biofase is doing--since the idea there is at least if the items are thrown in the trash (as they often are, as Elizabeth's comment points out), it's better to be compostable and/or be biodegradable in a landfill. We covered this here:

User Rank
still recyclable?
CLMcDade   1/21/2013 3:18:30 PM
Hi Ann,

Great article as usual.  As always with these introductory articles, they open the door to a lot of questions.  Mike and I were wondering the following:

When does the degradation kick in?  After exposure to what?  Into what components does it break down? 

All of these lead to our most important question, from a manufacturer of plastic components point of view - what is the impact of a biodegradable additive that is combined with PP or PE? 

-  Does it eliminate the possibility of recycling PP and PE materials into like product. 

- Will it prevent recycled plastics from having properties comparable to plastics without the additive? 

- Does the partially degraded bioplastic remain in recycled PP and PE or does the additive (and any components it has broken down into) burn off during recompounding or remelting? 

While a 100% compostable product makes a lot of sense, a partially decomposing one might not if it prevents or negatively impacts the recyclability of the PE or PP.

Elizabeth M
User Rank
Re: Innovative Process
Elizabeth M   1/21/2013 5:16:31 AM
I agree, Greg--good to see not just a great idea for using a natural resource to create a biodegradeable plastic but also showing the financial benefit to doing so, which often is how naysayers dismiss such initiatives. I love this idea, of course, especially as someone who consciously limits my use of single-use plastic because I know the truth about it--it can only be recycled once and ultimately ends up in landfills or in the ocean. And again, it's taking a country outside of the U.S. to lead the way on an environmental business move. Will definitely be keeping an eye on how this and similar ideas pan out.

TJ McDermott
User Rank
That's a lot of guacamole
TJ McDermott   1/20/2013 3:14:20 PM
30,000 metric tons a month, of just avocado pits.  One source on the web says an average avocado seed weighs 7.584 ounces (.215 kg, or .000215 metric tons).

30000 metric tons * (1 seed / .000215 metric tons) = 

139,534,884 avocados per month, 

1,674,418,605 per year. We've reached a Carl Sagan moment.


Please pass the tortilla chips?

TJ McDermott
User Rank
Unique process for each material?
TJ McDermott   1/20/2013 3:01:17 PM
Ann, your article leads me to believe each material requires its own unique process to become a plastic.  Avocado pits need one, corn needs a different one.

Is this true?  Is the grail of the bioplastic industry a universal process?

Greg M. Jung
User Rank
Innovative Process
Greg M. Jung   1/18/2013 11:26:47 PM
Great job for turning a cost outlay into a profit.  I applaud the innovative initiative to take a previous waste product and turn it into a productive product and a new revenue stream (not to mention reducing waste to the environment).

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