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Home Renewables Biofuels

Clean Energy from Food Waste

by Dafizeck Daud
March 28, 2022
in Biofuels, Features, Power Generation
Clean Energy from Food Waste
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Food waste is a growing problem in many parts of the world — and it is only expected to get worse in the coming years. The world population is expected to grow to 9.7 billion by 2050, alongside global food demand.

Not only will this create large amounts of food and municipal organic waste, but there will also be increasing amounts of agricultural waste as the global demand of vegetables, fruits and grains increases. For example, an estimated 60 percent of food produced in Canada — over 35 million tonnes per year — ends up in landfills. However, Canadian cities have also run out of land to dispose this accumulating waste.

Food waste comes with its own set of issues, including greenhouse gas emissions, unpleasant odours, pests and toxic fluids that can infiltrate water sources. In addition, every year, municipal dumps take over more land, reaching the edges of communities, which can lead to health issues for those who are living nearby.

To reduce the growing problem of food waste disposal, researchers are focusing on developing new technologies that use food waste to generate clean energy. My team and I are studying a process known as biomass gasification.

Biomass gasification

Biomass gasification uses heat, oxygen, steam, or a mixture of those, to convert biomass — food and agricultural waste or other biological materials — into a mixture of gases that can be used as fuel.

A diagram of the process of biomass gasification where food waste is mixed with heat, steam and oxygen to produce synthetic fuel or gasses called Syngas.

Biomass gasification uses heat, oxygen, steam, or a mixture of those, to convert biomass — food or agricultural waste, or other biological materials — into a mixture of fuel gases. (Salvador Escobedo Salas), Author provided

Biomass gasification works by feeding semi-dry food waste into a unit that looks a bit like a cooking pot, where it passes through a hot, bubbling substance that converts it to fuel gas. This process, known as fluidization is very efficient at converting food waste into high-valuable sources of energy-rich synthesis gas, a mixture of hydrogen, methane, carbon monoxide and carbon dioxide, also called syngas. Syngas can be used to generate heat and power. This process is sustainable because is considered to be carbon-neutral.

Farms, cities and municipalities could implement this sustainable technology to cut utility expenses for heating or electricity. They could also significantly reduce dependency on landfills and lower the operating budget for solid waste management services which can reach near US$380 million per year for a city the size of Toronto.

Replacing fossil fuels

The consumption of fossil fuels and their derivatives has created an environmental crisis, mainly due to greenhouse gas emissions in the atmosphere, which has led to climate change. As governments around the world implement climate policies that restrict greenhouse gas emissions or tax them, it is important to replace fossil fuels with alternative renewable sources of energy such as agricultural and food waste.

Although syngas can be used like a conventional natural gas, which is a methane-based fossil fuel, it is different from it because of its higher composition of carbon monoxide and hydrogen.

These gases can be further converted into high-value bio-based chemicals such as methanol and ammonia. Biomass gasification also generates biochar, which can be used to improve soil fertility.

The gasification process turns trash into gas in an economical and eco-friendly way.

While the production of syngas depends on the type of biomass and technology used. The Canadian Atikokan Generating Station, for instance, produced 205 megawatts of clean electricity. This is enough energy to power about 70, 000 residential and commercial buildings.

A sustainable and circular economy

Biomass gasification is a sustainable and technological strategy that turns food waste to a value-added product. It is a step along the path to a circular economy culture of zero waste.

Policy leaders and governments need to support sustainable programs by providing financial aid, subsidies and tax incentives. These programs may also encourage individuals and companies to invest in biomass gasification technologies and develop them on a commercial scale.

Biomass gasification brings cities and municipalities one step closer to putting an end to concerns about food waste. It also helps meet energy demands and displace fossil fuel use and will help us transition towards a sustainable and circular economy.

Tags: Biomass gasificationclean energyFood Wastepower generation
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