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A French company is using enzymes to recycle one of the most common single-use plastics

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A French company is using enzymes to recycle one of the most common single-use plastics


Because single-use plastics are largely derived from petroleum, by 2050 plastics might account for 20% of the world’s annual oil consumption. Reducing our dependence on plastics, and finding ways to reuse the plastic that’s already out in the world, could greatly reduce emissions.

Right now, only about 15% of all plastics worldwide are collected for recycling each year. Researchers have been trying since the 1990s to find new ways to break down plastics in the hopes of recycling more of them. Companies and researchers have worked to develop enzymatic processes, like the one used at Carbios, as well as chemical processes, like the method used by Loop Industries. But only recently have enzymatic and chemical processes started to go commercial.  

Carbios’s new reactor measures 20 cubic meters—around the size of a cargo van. It can hold two metric tons of plastic, or the equivalent of about 100,000 ground-up bottles at a time, and break it down into the building blocks of PET—ethylene glycol and terephthalic acid—in 10 to 16 hours.

The company plans to use what it learns from the demonstration facility to build its first industrial plant, which will house a reactor about 20 times larger than the demonstration reactor. That full-scale plant will be built near a plastic manufacturer somewhere in Europe or the US, and should be operational by 2025, says Alain Marty, Carbios’s chief science officer.

Carbios has been developing enzymatic recycling since the company was founded in 2011. Its process relies on enzymes to chop up the long chains of polymers that make up plastic. The resulting monomers can then be purified and strung together to make new plastics. Researchers at Carbios started with a natural enzyme used by bacteria to break down leaves, then tweaked it to make it more efficient at breaking down PET.

Carbios’s demonstration facility in Clermont-Ferrand, France. Image courtesy of SkotchProd.

Carbios estimates that its enzymatic recycling process reduces greenhouse gas emissions by about 30% compared to virgin PET. Marty says he expects that number to increase as they work out the kinks.

In a recent report, researchers estimated that manufacturing PET from enzymatic recycling could reduce greenhouse gas emissions between 17% and 43% compared to making virgin PET. The report wasn’t specifically about Carbios, but it’s probably a good estimate for its process, according to Gregg Beckham, a researcher at the US National Renewable Energy Laboratory and a co-author of the report.

While developing new enzymes has been a major focus of new research and commercial efforts, other parts of the process will determine how efficient and cost-effective the technology will be, says Beckham, who leads a consortium on new plastic recycling and production methods.

“It’s all the less glamorous stuff,” Beckham says, like getting the plastic into a form that the enzymes can efficiently break down or separating what the enzymes spit out, that can take a lot of energy and time, and drive up emissions and costs.

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A pro-China online influence campaign is targeting the rare-earths industry

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A pro-China online influence campaign is targeting the rare-earths industry


China has come to dominate the market in recent years, and by 2017 the country produced over 80% of the world’s supply. Beijing achieved this by pouring resources into the study and mining of rare-earth elements for decades, building up six big state-owned firms and relaxing environmental regulations to enable low-cost and high-pollution methods. The country then rapidly increased rare-earth exports in the 1990s, a sudden rush that bankrupted international rivals. Further development of rare-earth industries is a strategic goal under Beijing’s Made in China 2025 strategy.

The country has demonstrated its dominance several times, most notably by stopping all shipments of the resources to Japan in 2010 during a maritime dispute. State media have warned that China could do the same to the United States.

The US and other Western nations have seen this monopoly as a critical weakness for their side. As a result, they have spent billions in recent years to get better at finding, mining, and processing the minerals. 

In early June 2022, the Canadian mining company Appia announced it had found new resources in Saskatchewan. Within weeks, the American firm USA Rare Earth announced a new processing facility in Oklahoma. 

Dragonbridge engaged in similar activity in 2021, soon after the American military signed an agreement with the Australian mining firm Lynas, the largest rare-earths company outside China, to build a processing plant in Texas. 

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The U.S. only has 60,000 charging stations for EVs. Here’s where they all are.

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The U.S. only has 60,000 charging stations for EVs. Here’s where they all are.


The infrastructure bill that passed in November 2021 earmarked $7.5 billion for President Biden’s goal of having 500,000 chargers (individual plugs, not stations) around the nation. In the best case, Michalek envisions a public-private collaboration to build a robust national charging network. The Biden administration has pledged to install plugs throughout rural areas, while companies constructing charging stations across America will have a strong incentive to fill in the country’s biggest cities and most popular thoroughfares. After all, companies like Electrify America, EVgo, and ChargePoint charge customers per kilowatt-hour of energy they use, much like utilities.

Most new electric vehicles promise at least 250 miles on a full charge, and that number should keep ticking up. The farther cars can go without charging, the fewer anxious drivers will be stuck in lines waiting for a charging space to open. But make no mistake, Michalek says: an electric-car country needs a plethora of plugs, and soon.

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We need smarter cities, not “smart cities”

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We need smarter cities, not “smart cities”


The term “smart cities” originated as a marketing strategy for large IT vendors. It has now become synonymous with urban uses of technology, particularly advanced and emerging technologies. But cities are more than 5G, big data, driverless vehicles, and AI. They are crucial drivers of opportunity, prosperity, and progress. They support those displaced by war and crisis and generate 80% of global GDP. More than 68% of the world’s population will live in cities by 2050—2.5 billion more people than do now. And with over 90% of urban areas located on coasts, cities are on the front lines of climate change.

A focus on building “smart cities” risks turning cities into technology projects. We talk about “users” rather than people. Monthly and “daily active” numbers instead of residents. Stakeholders and subscribers instead of citizens. This also risks a transactional—and limiting—approach to city improvement, focusing on immediate returns on investment or achievements that can be distilled into KPIs. 

Truly smart cities recognize the ambiguity of lives and livelihoods, and they are driven by outcomes beyond the implementation of “solutions.” They are defined by their residents’ talents, relationships, and sense of ownership—not by the technology that is deployed there. 

This more expansive concept of what a smart city is encompasses a wide range of urban innovations. Singapore, which is exploring high-tech approaches such as drone deliveries and virtual-reality modeling, is one type of smart city. Curitiba, Brazil—a pioneer of the bus rapid transit system—is another. Harare, the capital of Zimbabwe, with its passively cooled shopping center designed in 1996, is a smart city, as are the “sponge cities” across China that use nature-based solutions to manage rainfall and floodwater.

Where technology can play a role, it must be applied thoughtfully and holistically—taking into account the needs, realities, and aspirations of city residents. Guatemala City, in collaboration with our country office team at the UN Development Programme, is using this approach to improve how city infrastructure—including parks and lighting—is managed. The city is standardizing materials and designs to reduce costs and labor,  and streamlining approval and allocation processes to increase the speed and quality of repairs and maintenance. Everything is driven by the needs of its citizens. Elsewhere in Latin America, cities are going beyond quantitative variables to take into account well-being and other nuanced outcomes. 

In her 1961 book The Death and Life of Great American Cities, Jane Jacobs, the pioneering American urbanist, discussed the importance of sidewalks. In the context of the city, they are conduits for adventure, social interaction, and unexpected encounters—what Jacobs termed the “sidewalk ballet.” Just as literal sidewalks are crucial to the urban experience, so is the larger idea of connection between elements.

Truly smart cities recognize the ambiguity of lives and livelihoods, and they are driven by outcomes beyond the implementation of “solutions.”

However, too often we see “smart cities” focus on discrete deployments of technology rather than this connective tissue. We end up with cities defined by “use cases” or “platforms.” Practically speaking, the vision of a tech-centric city is conceptually, financially, and logistically out of reach for many places. This can lead officials and innovators to dismiss the city’s real and substantial potential to reduce poverty while enhancing inclusion and sustainability.

In our work at the UN Development Programme, we focus on the interplay between different components of a truly smart city—the community, the local government, and the private sector. We also explore the different assets made available by this broader definition: high-tech innovations, yes, but also low-cost, low-tech innovations and nature-based solutions. Big data, but also the qualitative, richer detail behind the data points. The connections and “sidewalks”—not just the use cases or pilot programs. We see our work as an attempt to start redefining smart cities and increasing the size, scope, and usefulness of our urban development tool kit.

We continue to explore how digital technology might enhance cities—for example, we are collaborating with major e-commerce platforms across Africa that are transforming urban service delivery. But we are also shaping this broader tool kit to tackle the urban impacts of climate change, biodiversity loss, and pollution. 

The UrbanShift initiative, led by the UN Environment Programme in partnership with UNDP and many others, is working with cities to promote nature-based solutions, low-carbon public transport, low-emission zones, integrated waste management, and more. This approach focuses not just on implementation, but also on policies and guiderails. The UNDP Smart Urban Innovations Handbook aims to help policymakers and urban innovators explore how they might embed “smartness” in any city.

Our work at the United Nations is driven by the Sustainable Development Goals: 17 essential, ambitious, and urgent global targets that aim to shape a better world by 2030. Truly smart cities would play a role in meeting all 17 SDGs, from tackling poverty and inequality to protecting and improving biodiversity. 

Coordinating and implementing the complex efforts required to reach these goals is far more difficult than deploying the latest app or installing another piece of smart street furniture. But we must move beyond the sales pitches and explore how our cities can be true platforms—not just technological ones—for inclusive and sustainable development. The well-being of the billions who call the world’s cities home depends on it.

Riad Meddeb is interim director of the UNDP Global Centre for Technology, Innovation, and Sustainable Development. Calum Handforth is an advisor for digitalization, digital health, and smart cities at the UNDP Global Centre.

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