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    Food waste cement

    TOKYO (AP) – Ever dreamed of having a gingerbread house like Hansel and Gretel? In the near future, edible houses may no longer just be found in fairy tales.

    Tokyo University researchers Kota Machida and Yuya Sakai have developed a technology to transform food waste into potentially edible “cement” for construction use.

    It’s the world’s first process for making cement entirely from food waste. The researchers said the tensile, or bending, strength of their product is nearly quadruple that of ordinary concrete.

    Machida and Sakai said they hope to help reduce global warming, alleviating problems related to wasted food materials that emit methane when they rot while buried in landfills.

    Sakai, an associate professor of Industrial Science, developed the technology while researching sustainable materials that could replace cement-based concrete.

    Cement production accounts for eight per cent of the world’s carbon dioxide emissions, according to the think tank Chatham House.

    In the beginning, he was developing a way to make concrete by subjecting pulverised wood particles to heat compression.

    Tokyo University researchers Yuya Sakai and Kota Machida check on dried vegetables and fruit peels before pulverising them to particles at their university’s laboratory in Tokyo. PHOTOS: AP
    A sample of the food cement made out of dried cabbage

    The three-step process of drying, pulverisation, and compression was done using simple mixers and compressors the researchers said can be bought on Amazon.

    Sakai, with his student Machida, decided to do the same thing with food waste.

    Previous trials using food waste to make cement required plastics to be mixed in to get the materials to stick together.

    After months of failures, they realised they could get the cement to bind by adjusting the temperature and pressure used.

    “The most challenging part was that each type of food waste requires different temperatures and pressure levels,” Sakai said.

    Other experiments in using food waste in construction have mainly focussed on using stuff such as coffee grounds or bio-waste ashes as filler in regular concrete.

    Sakai and Machida said they have successfully made cement using tea leaves, orange and onion peels, coffee grounds, Chinese cabbage, and even lunchbox leftovers.

    They’ve adjusted flavours with different spices and found the colours, scent and taste of the cement can be quite appealing.

    To be able to eat the material, a person would need to break it into pieces and boil it, Sakai said.

    To make the cement waterproof and protect it from being eaten by rodents and other pests, it might be coated with Japanese lacquer.

    Food waste is a huge problem in Japan and worldwide.

    Japan produced around 5.7 million tonnes of edible food waste in 2019 and the government aims to reduce that around 2.7 million tonnes by 2030.

    Machida started a company called Fabula Inc last year with two of his childhood friends.

    They are working with other companies to make cups, cutlery, and furniture out of food cement.

    Sakai said the process could be used to make edible makeshift housing for disasters.

    “For example, if food cannot be delivered to evacuees, they could eat makeshift beds made out of food cement,” he said.

    The food cement can be reused and is bio-degradable, so it can be disposed simply by burying when it is no longer needed.

    “Our ultimate hope is that this cement replaces plastic and cement products, which have worse environmental impacts,” said Machida.

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