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22 -February- 2022

Used PPE Turned into Water and Vinegar

Turning non-recyclable PPE into water and vinegar could be the game-changing solution the world needs to stop tonnes of PPE being dumped daily into landfills and oceans.

This miracle-sounding process has been developed at the University of Auckland’s Faculty of Engineering. Shredded masks, gowns, gloves and plastic safety glasses go into a machine; hot, pressurised water and compressed air are applied; water and acetic acid are the end-products.

The PPE-to-liquid process is carried out at a temperature of 300°C and takes about an hour in a small prototype machine in a laboratory in the faculty. Gaseous by-products from the process are oxygen and low concentrations of carbon dioxide which can be safely discharged.

“This is a clean, chemical-free solution which will be a game changer internationally,” says Dr Saied Baroutian, an associate professor in the faculty’s Department of Chemical and Materials Engineering.

“The technology used is a hydrothermal deconstruction or valorisation process and it destroys the waste completely. The liquid produced in the process is safe, inert and can be reused – the vinegar or acetic acid can be used for disinfecting and the water can be reused for the processing cycle therefore minimising water consumption and helping with sustainability.” The process has been developed at the university in collaboration with the Faculty of Medical and Health Sciences and the Universities of Otago and Waterloo (Canada).

It is one of two innovative solutions that link up to tackle the Covid-19 healthcare waste problem which has been described as “threatening human and environmental health” by the World Health Organisation.

In terms of cost, the researchers have already completed an economic analysis which shows a large-scale hydrothermal deconstruction system could process PPE waste at a cost comparable to the current practice of autoclaving and landfilling.

“And in terms of the environment,” says Dr.Saeid, “the savings on offer are huge.”

Courtesy: Technology Networks

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