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Danish City First To Test Return System For Reusable Coffee Cups

Danish City First To Test Return System For Reusable Coffee Cups

The Danish city of Aarhus launched a three-year trial program to curve down the number of disposable coffee cups where locals can use a deposit system for reusable takeaway packages.

Like in other Nordic and Central European countries, in Denmark deposit system where one receives back money one pays when purchasing a plastic bottles or cans is already in place

The project that focused on eliminating disposable cups trash is the result of a collaboration between the Municipality of Aarhus and the recycling company TOMRA which already provides other waste collection services to the city.

For a year and a half in 2022, the company All In On Green’s robotic arm SeaProtectorOne deployed in the water, collected over 100,000 disposable glasses from the city’s river Å – from which the city derived its name – demonstrating a huge level of plastic pollution in the city.

”Aarhus must be greener and more sustainable, and Aarhus must be a city where we have the courage to test new solutions.” said Nicolaj Bang, Aarhus’ councillor for technology and environment in a press release. “We use enormous amounts of takeaway packaging in Denmark, and consumption is increasing. Therefore, it really matters if we can make it easier for both consumers and businesses to choose a more sustainable alternative to disposable packaging,” he stated.

Aarhus is the second biggest city in Denmark, counting around 336,000 inhabitants – and potential disposable cup users. The trial has been set as voluntary, but so far already 44 cafés and bars in the center of the city got interested in the project – perhaps even some frequented by King Frederik X, when he used to study at the city’s university.

Initially, 40,000 cups in two designs will be produced and around 25 deposit machines will be established in the city so that citizens can return their cups, and cash back some Danish kroner. Geir Sæther, senior vice president for circular economy at TOMRA said the company expects ‘to be able to expand the system to other types of packaging in the near future’, so to facilitate the transition from single-use to reusable packaging.

The return fee for a reused cup is just over 70 dollar cents (DKK 5) , but it is not for the money that citizens should start returning their cups: ”Recycling saves the earth’s resources and our emission of CO2. More recycling means that there is less waste that ends up as rubbish in our city and our nature,” said Bang.

This is the first city in Denmark, and the world, to carry out such city experiments, although Copenhagen had previously trialed an experimental system where pizza containers, sushi trays and coffee cups should be able to be returned in the hip area of Kødbyen, situated in a central neighborhood. Currently, Danish startup Kleen hub is experimenting in the capital with its third-generation return system based on a single bank card tap.

TOMRA’s ceo Tove Andersen said in a press release that “Aarhus shows the way to one more sustainable future, and we hope that many more cities will be inspired to do the same,”.

Cities and regional authorities have so far acted upon consumer behaviors to decrease different kinds of pollution in their cities: “These policies are quietly working because local governments are addressing climate change with communities long-term together with other challenges that people care about, like healthy diets and supporting local businesses,” said Olivier de Schutter, co-chair of the sustainable food system expert team IPES-Food.

 

 


 

 

Source  Forbes

 

 

Coffee Biochar Concrete Carbon Sequestration

Coffee Biochar Concrete Carbon Sequestration

Coffee is one of the most popular drinks worldwide; on average, 400 billion cups of coffee are consumed each year. As a result, approximately 18 million tonnes of coffee grounds are produced annually. Coffee grounds can be used for a variety of purposes. It can be used to fertilize your garden or added to compost. Coffee grounds can neutralize odors, can be used to exfoliate your skin, tenderize meats, and many other uses.

Despite all of these amazing uses for coffee grounds, the reality is that most of the coffee grounds produced actually end up in landfills; about 75% in fact. Rotting coffee grounds generate methane, a powerful greenhouse gas contributing to warming. Rotting coffee grounds also emit carbon dioxide, nitrous oxide, and ammonia. While there have been programs from coffee shops that will donate their coffee grounds to customers to use in their gardens (Starbucks has been part of the Grounds for Your Garden program since 1995), but most coffee shops are not implementing these initiatives.

Researchers from the Royal Melbourne Institute of Technology University in Australia have found a way to use coffee grounds on a larger scale and to eliminate the risk of them ending up in landfills. And that is to use coffee biochar concrete in the construction industry.

The researchers have developed concrete that is almost 30 percent stronger than traditional concrete by mixing in coffee-derived biochar. The coffee biochar was created using a low-energy process called pyrolysis. The organic waste is heated to 350 degrees Celsius without oxygen to avoid the risk of generating carbon dioxide. Under pyrolysis, organic molecules vibrate and break down into smaller components, creating biochar. This is a similar process that is used to roast unused beans to enhance their taste, except without the use of oxygen.

In coffee biochar concrete, about 15 percent of the sand they would use to make concrete is replaced with the coffee biochar, thus creating new concrete. The coffee biochar is finer than sand, and its porous qualities help to bind to organic material. Reducing the total use of sand in concrete will minimize the construction industry’s environmental footprint. It is said that over 50 billion metric tons of natural sand are used annually in construction. Sand mining significantly stresses ecosystems, including riverbeds and riverbanks, coffee biochar concrete can relieve some of that pressure on the environment.

The cement industry is the third largest source of industrial air pollution, including sulfur dioxide, nitrogen oxides, and carbon monoxide. Moreover, cement currently accounts for around 8% of global carbon dioxide emissions. Turning coffee- biochar into concrete will reduce the construction industry’s reliance on continuous mining of natural resources, making the industry more sustainable.

When introduced into concrete mixtures, the coffee biochar concrete was found to act as a microscopic carbon repository within the concrete matrix. The alkaline conditions within hardened concrete enable biochar to mineralize and firmly bind carbon dioxide into its structure over time. Concrete containing even a small percentage of spent coffee biochar was shown to sequester meaningful quantities of CO2 from the curing process and surrounding environment.

Utilizing waste coffee grounds to synthesize biochar for carbon sequestration could offer a sustainable way to offset concrete’s sizable carbon footprint while giving new purpose to spent grounds. With further research, coffee biochar concrete could provide a feasible carbon capture pathway for the construction industry.

The researchers estimate that if all the waste grounds produced in Australia annually could be converted into coffee biochar, it would amount to roughly 22,500 tonnes. Compare that to the 28 million tonnes of sand that are required to produce over 72 million tonnes of cement concrete in Australia. Just think: Australia has over 13 thousand coffee shops, whereas the United States has over 38 thousand coffee shops. If this project expands outside of Australia, coffee biochar concrete could significantly impact the environment and waste.

The research on coffee biochar concrete is still in the early stages; there is still a lot of testing to be done, but it shows that there are innovative and unique ways to reduce and repurpose organic landfill waste. Once the researchers can account for things like durability, the researchers will collaborate with local councils on future infrastructure projects, including the construction of walkways and pavements. Just think, we are one step closer to adding sustainability into the construction industry and one step closer to walking on coffee biochar concrete!

 

 


 

 

Source   Happy Eco News