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Toward a Circular Economy: Tackling the Plastics Recycling Problem
By Margaret Sobkowicz
Why has the world continued to increase consumption of plastic materials when at the same time, environmental and human health concerns over their use have grown?
One answer is they are immensely useful to humankind, and despite problems they create, they have provided countless benefits. They are used to construct lighter automobiles and planes, improving fuel efficiency and reducing greenhouse gas emissions. Plastic food packaging has dramatically reduced food spoilage, improving human health as well as decreasing emissions associated with transportation and decomposition of waste. In addition to all these upsides, another benefit often quoted is that plastics are recyclable.
At UMass Lowell, where I am based, we argue that "recyclable" must be clearly distinguished from "recycled." Unfortunately, society has a long way to go before we could declare plastics recycling a success.
My group has been working for the past eight years on sustainability of plastic materials for a range of applications. We study plant-based and biodegradable polymers, improved technologies for recycling plastics and reducing plastics toxicity. Polymers (long-chain organic molecules) are fascinating materials, and they have provided so many benefits to society; however, as population and consumption rates grow, humans must always be mindful of our relationship with the Earth. It is my goal as a researcher, educator and citizen to harness the tools of engineering for environmentally sound plastics production and use.
The Plastics Recycling Infrastructure is Flawed
Polymers are large molecules made up of many repeating units. They exhibit diverse mechanical, thermal and chemical properties that make them suitable for a wide range of applications. They are called "plastics" because in theory they can be reshaped multiple times into new products—that is, they are recyclable. In practice, unfortunately, remelting and forming new packaging often degrades the properties of these recycled products, as they are contaminated with impurities from food, labels and other materials.
With the introduction of fines for littering and increasing environmental awareness, the fraction of waste Americans recycle increased steadily starting in the 1970s. In recent decades, however, recycling rates have stalled due to limited technological and logistical options for the materials collected from residential and industrial sites. Today, chemical and polymer companies have become experts at making new plastic products that are durable and inexpensive. Since this new "virgin" plastic is cheap, there is little incentive for using the recycled versions if properties are compromised in any way. Improving recycling performance depends on several complex factors.
The Key to Recycling Plastics: People
The first and most important variable is that people need to participate. In general, Americans show a strong commitment to using recycle bins—when they are made available. But far too many large event centers and point sources of plastics waste do not prioritize collection of recyclable items. Furthermore, the public is confused about which plastic types can and should end up in the recycling bin.
Complex plastic products such as multi-layer film and electronics housings are more difficult to recycle. And current trends suggest that manufacturers are shifting to more complex materials. Bright, multicolored designs end up as a dull brown color when the different packages are melted down. Advanced functionality such as embedded electronics, oxygen barrier layers and other exciting technologies have the unfortunate downside of decreasing the package value in a recycled stream, because separations are difficult and costly.
The technology to sort different varieties of plastic is also lagging. The quality of a recycled plastic depends on its purity. It must be decontaminated from food waste, labels and other polymer types before it is melted down and resold to a product maker. While some automated technologies exist, a large amount of the sorting is still done by hand and the results are imperfect at best.
Once industry demands high quality recycled plastic, then reprocessors will have the confidence to produce a consistent stream to replace some or all of the virgin material they use in their products. The industry needs to standardize the metrics by which the quality of recycle streams are measured.
This wish list for improving the recycling infrastructure may seem insurmountable, but public-private consortia like the REMADE institute are gathering industry stakeholders, university researchers and national labs to tackle the challenge.
An Urgent Call to Action
In July 2017, China announced that it would stop accepting imports of certain classes of waste that come from the recycled streams in other parts of the world. These included contaminated bales of mixed plastics and forms that are challenging to reprocess. This has left piles of waste plastics sitting on loading docks at municipal recycling facilities around the U.S., Canada and Europe.
At the same time, the public outcry over the plastics pollution problem is growing. From the recent efforts to clean up the Great Pacific Garbage Patch to the viral image of a turtle with a straw in its nose that led to widespread rejection of drinking straws, the public is increasingly aware of and demanding solutions to the problem.
Where Do We Go From Here?
The Ellen MacArthur Foundation is a U.K.-based charitable organization that is focused on environmental issues. The foundation has called for a circular economy approach to work toward a new plastics economy. They are working with business, government and academia to shift the way humans consume. Currently society's throwaway culture supports a linear economy in which items, especially plastics, are used once and tossed out. In a circular economy, plastics would be designed, manufactured and collected in such a way that they could easily be broken down, separated and recycled. As an example, a thoughtfully designed cellphone could be separated into plastics, electronics, glass and other components, and each stream could then be recycled into something just as high quality the second time around—hence the phrase "circular economy."
The concept introduces a three-pronged approach to eliminate unnecessary plastics we consume, innovate new packaging designs that are more easily recycled or reused, and recirculate more of the plastics we do use through appropriate diversion and reprocessing strategies.
How does the circular economy work? Ellen MacArthur Foundation / CC BY-SA
The time is ripe for innovation, but academics, regulatory agencies and stakeholders from multiple points in the value chain must work together. The Plastics Engineering Department here at UMass Lowell is poised to take on the challenge. We are working on new biodegradable polymer recipes and new processes for recycling plastics. We are sharing our findings with the public, collaborating with industry-leading partners and educating next-generation plastics engineers so they can be leaders of change.
Reposted with permission from our media associate The Conversation.
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By Will Sarni
It is far too easy to view scarcity and poor quality of water as issues solely affecting emerging economies. While the images of women and children fetching water in Africa and a lack of access to water in India are deeply disturbing, this is not the complete picture.
The Past is No Longer a Guide to the Future
We get ever closer to "day zeros" — the point at when municipal water supplies are switched off — and tragedies such as Flint. These are not isolated stories. Instead they are becoming routine, and the public sector and civil society are scrambling to address them. We are seeing "day zeros" in South Africa, India, Australia and elsewhere, and we are now detecting lead contamination in drinking water in cities across the U.S.
"Day zero" is the result of water planning by looking in the rear-view mirror. The past is no longer a guide to the future; water demand has outstripped supplies because we are tied to business-as-usual planning practices and water prices, and this goes hand-in-hand with the inability of the public sector to factor the impacts of climate change into long-term water planning. Lead in drinking water is the result of lead pipe service lines that have not been replaced and in many cases only recently identified by utilities, governments and customers. An estimated 22 million people in the US are potentially using lead water service lines. This aging infrastructure won't repair or replace itself.
One of the most troubling aspects of the global water crisis is that those least able to afford access to water are also the ones who pay a disproportionately high percentage of their income for it. A report by WaterAid revealed that a standard water bill in developed countries is as little as 0.1 percent of the income of someone earning the minimum wage, while in a country like Madagascar a person reliant on a tanker truck for their water supply would spend as much as 45 percent of their daily income on water to get just the recommended daily minimum supply. In Mozambique, families relying on black-market vendors will spend up to 100 times as much on water as those reached by government-subsidized water supplies.
Finally, we need to understand that the discussion of a projected gap between supply and demand is misleading. There is no gap, only poor choices around allocation. The wealthy will have access to water, and the poor will pay more for water of questionable quality. From Flint residents using bottled water and paying high water utility rates, to the poor in South Africa waiting in line for their allocation of water — inequity is everywhere.
Water Inequity Requires Global Action — Now.
These troubling scenarios beg the obvious question: What to do? We do know that ongoing reports on the 'water crisis' are not going to catalyze action to address water scarcity, poor quality, access and affordability. Ensuring the human right to water feels distant at times.
We need to mobilize an ecosystem of stakeholders to be fully engaged in developing and scaling solutions. The public sector, private sector, NGOs, entrepreneurs, investors, academics and civil society must all be engaged in solving water scarcity and quality problems. Each stakeholder brings unique skills, scale and speed of impact (for example, entrepreneurs are fast but lack scale, while conversely the public sector is slow but has scale).
We also urgently need to change how we talk about water. We consistently talk about droughts happening across the globe — but what we are really dealing with is an overallocation of water due to business-as-usual practices and the impacts of climate change.
We need to democratize access to water data and actionable information. Imagine providing anyone with a smartphone the ability to know, on a real-time basis, the quality of their drinking water and actions to secure safe water. Putting this information in the hands of civil society instead or solely relying on centralized regulatory agencies and utilities will change public policies.
Will Sarni is the founder and CEO of Water Foundry.
Note: This post also appears on the World Economic Forum.
Reposted with permission from our media associate Circle of Blue.
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