"Whether it's crystallized or blended with other polymers, if handled appropriately like other polymers, Ingeo can be recycled and its properties retained through numerous recycle events," said Frank Diodato, segment director for durables and distribution for NatureWorks. "This is true for both post-industrial and post-consumer Ingeo (engineering) plastics formulations. At the post-consumer level plastics are often mixed, making recycling more difficult, but that's not as common with post-industrial materials."
Although bioplastics have been targeted as "contaminating" the recycling and waste stream, nearly all plastics do, said Davies.
"Bottles in the US are typically made of either 100-percent clear polyethylene terephthalate (PET) or 100-percent white high-density polyethylene, so these are easily identified. They are easy for consumers to identify, and for material recovery facilities (MRFs) to sort manually, and therefore get recycled in very high numbers. By contrast, clear clamshells can be made of PET, polystyrene, or polypropylene, and recyclers need the most modern equipment to distinguish among them. Most of them sort out bottles only and then landfill the rest, or ship it to Asia for sorting, or ship it to end users here for reuse."
Aside from sharing details with MRFs about how to work with its products, NatureWorks also wants to help develop end markets. "Once there are end markets for a material, the MRFs will be happy to sort it." said Davies. For example, traditional plastics compounders buy different plastics feedstocks and mix them together to make value-added blends. Some of them are interested in buying NatureWorks' recycled polylactic acid (PLA) bioplastics. BioCor, for example, already buys post-industrial and post-consumer PLA scrap, both petro-plastic and bioplastic.
The new range of materials made out of recyclables is opening up huge design possibilities. It's interesting to note that, right now, this is really taking just a drop in the bucket out of the waste stream. In 50 years, however, we could see a significant reduction in the waste stream because of serious percentages of recylcing. As well, the whole movement, notable in the auto industry, about designing equipment so that it's easily disassembled, will reach full flower and feed into this. Also of note is the fact that what's happening now seems driven more by technology than regulations, which makes it more organic.
Seems there are two interesting aspects of this story, Ann. for one, it's good to see a manufacturer would work with a recycler to make sure the products they produce have a welcome home at their end of life. It's also good to see these products will break down easily in landfills -- given that you say 88 percent of plastic doesn't get recycled.
Rob, Completely agree with you and it seems like those two criteria will ultimately become requirements for almost all types of recycling options. It's amazing to think about the amount of innovation that will likely occur in this market area over the next few years, given the pace of developments at this point. Good stuff, Ann.
Thanks for the feedback guys. Actually, only some bioplastics are biodegradable--but purposeful, managed composting and biodegrading in landfills are two different things. The first captures as much CO2 as possible, while the second does not--landfills are the last resort that everyone is trying to avoid because it takes so long for anything to break down there and lets off a lot of CO2 into the atmosphere. Engineering bioplastics are neither, so recycling them is the best option.
Alex' point is a good one about technology, not regulations, driving things. That's certainly the case when it comes to energy recovery of plastic by recycling them into fuels, which will be the subject of my May feature.
Chuck, it is possible to recycle plastics into fuels, which is the subject of my upcoming May feature article on alternative energy. However, bioplastics aren't currently a large component in such recycled plastics-based fuel, since they represent such a small part of the plastics waste stream and since plastics-to-oil technology is only just starting to take off commercially. But yes, you can start with either biomaterials or petromaterials to get to ethanol, and this is happening in small numbers.
I agree, Apresher. Given the low participation in recycling, your suggestion of making materials that decompose easily may be a big answer. Now that we're harvesting methane from landfills, decomposable trash going to landfills will become positive.
It's true that some energy harvesting is occurring at landfills, but it's important to remember that there's a world of difference in CO2 released between unmanaged biodegradation in the typical landfill or anywhere else on the one hand, and managed composting in landfills or anywhere else, on the other. A biodegradable material can take many many years to finish biodegrading, during which time it releases considerable amounts of CO2 and may also leave undesirable residues in the soil. Composting, when done right, happens a lot faster, capturing more CO2 and leaving little or (preferably) no residues.
There are many places on the web to find our more, but here's some info and definitions from BASF, a bioplastics maker:
The focus of my May feature is on plastics to oil technologies, not on harvesting energy from managed compositing at landfills, so I don't have details on those latter processes. The more common energy harvesting processes that are not plastics-to-oil either use mixed plastics and paper waste for solid recovered fuel (SRF) or refuse derived fuel (RDF), or the older combustion technologies of waste to energy (WTE) that use unsorted materials.
But, like everything else, recycling begins in the home. Our fast paced and often immoral life-style seems to be endangering the original concept of home. We now rely government, industry, science, and big thinking to solve the simplest problems that use to be second nature in the home.
My first question is how are the bioplastics identified? Is there a symbol for the recyclers, or anybody, to identify them by?
One advantage that the old dumps used to have that was much more effective than the modern encapsulation process was the exposure of the materials to both the ultraviolet from the sun and a constant supply of air and water.
In order for recycling to succeed it must be a bit profitable, otherwise it will exist as a drain on most governments. I don't have the answers about how to make it profitable right now, but I am working on it. And amazingly enough, the solution will not involve the government setting up programs, but rather the government getting out of the way.
William, as we've mentioned before, the two main problems with letting plastics degrade in the sun is that it takes way too long, and all that potential energy as a BTU value is wasted. Bioplastics are not necessarily biodegradable. Regarding labeling, I think you mean end-user sorting codes. Whether they are marked with the same information for recycling as petro-based varieties, I don't know, but would be surprised if they weren't.
Ann, it is certainly correct that allowing plastics to decompose in a landfill is a waste of either the recoverable energy or the material itself. ON the other side, however, is the question about the cost of doing anything else. My preference would be complete recycling of almost everything. The challenge is in the collection and sorting, of course. Much of the material would need to be extracted from the municiple waste stream, since a large portion of the population seems to be unwilling or unable to separate anything for recycling. That is where the problem lies.
William, I'm with you on those priorities, and so is everyone I've talked to about recycling and converting non-recycled plastics into fuel in my upcoming May feature on alternative energy. At each stage in the material's lifecycle, the question is often phrased as "what is the best and highest use, from both an economic and an environmental perspective?" Recycling is always considered first, but if that's not possible or would cost too much in money or environmental burden, then other energy recovery options should be explored.
Great article. Definitely current to the trends with bioplastics.
I manage a post-consumer bioplastics recycling initiative on a university campus. The bioplastic waste is being source separated at various dining locations on campus. Issues that our project has run in to are numerous:
1) The clear plastic bioplastic products (used by all dining facilities on campus) look just like PET products. So it is difficult for even people that care to recycle to easily tell the difference.
2) There is much confusion among students about our project because many of them that are environmentally conciencious know that the PLA (polylactic acid) waste is compostable, so they think our project is for composting instead of recycling and they think they are helping by including their food and paper waste in our recycling bin. My team of students has tried to use bold sinage that says "Place food waste in the trash, then place your PLA waste here". It has helped, but there is still some confusion certainly. All of the food waste and other garbage is currently being sorted by hand.
3) Because these products are used as "to-go" it is very difficult for our project to have messaging and containers everywhere that these products may travel to like academic buildings. We have implemented collection receptacles in the lobby of each residence hall, but few students have utilized them.
4) Getting college kids to really understand the entire process and significance of the project is very difficult; most of them truly don't care about how much waste they produce and where it goes.
Overall since September 2011 our project, titled FRESH, has diverted ~300lbs of PLA waste from going to a landfill. It's a start.
The PLA waste that has been collected has been stored on campus and will be shipped in one batch to a company in Eau Claire, WI that has the capability to do chemical recycling of PLA.
The PLA bioplastics have a resin identification code of 7, which is the broad category "other plastics". There is momentum to change the resin identification code to 0 for PLA. I've seen the 0 used on a select few items, but not the items we use on our campus.
I am a graduate student in waste management at UW-Stevens Point. The website for the FRESH Project is www.uwsp.edu/fresh. The project is led by the Wisconsin Institute for Sustainable Technology (WIST) and is funded by the Wisconsin State Energy Office. Transparency is the best policy for efforts like this one.
My graduate research is comparing the two end-of-life options for PLA waste: composting vs. chemical recycling.
wykratz, thanks for your input. It's great to hear from someone directly involved in bioplastics recycling. Interestingly, I met with both people from NatureWorks quoted in this article yesterday at the National Plastics Exposition in Orlando, FL. And I asked them the same question: how are bioplastic food service items coded and does that help in recycling? They told me that bioplastics are marked with the "7" or "other" category, as you mention. However, this coding system was developed for materials code labeling, not as a sorting system for recycling. Looks like we need a better coding/labeling system for consumers: I know I get confused, too, when trying to recycle, especially in public venues.
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Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.