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7 Algae uses that can help save the world

Jessica Guttridge

Students, researchers and businesses are looking to the sea for sustainable business solutions

The world’s first algae biotech accelerator, Green Light, is showcasing student ideas, start-ups and SMEs that are creating businesses opportunities through algae-based biotechnology innovation.

Researchers in the field call algae the cutting edge of today’s biotechnology, with applications across carbon offsetting, water waste management, fuel, plastics, clothing, and a potential food source. 

While the amount of fertile land for farming is decreasing as a result of global warming, huge bodies of water can be cultivated with crops of algae. Researchers point out that algae are fast growing, require little effort to cultivate, use a fraction of the land and water required to grow grain crops, and can be grown in separate ponds or the ocean. 

Algae cleans the water and generally produces more oxygen during the day than it consumes at night, however there are conditions where it can disrupt water quality. When algae dies it reduces the water’s oxygen supply, while severe weather conditions can rapidly mix different layers of water and algae. As a result, harvesting algae and using it as a resource can help keep water quality in check. 

Successful cohorts of the five-month program have access to seed funding of up to $20,000, research expertise and mentoring, masterclasses and networking opportunities to support their idea.

Green Light is run by the University of Technology Sydney (UTS) Deep Green Biotech Hub, which supports the rise of algae biotechnology in New South Wales.

There are multiples potential uses for algae, here are some that are being looked at or developed already:

  1. Carbon offsets/reduction 
    Algae when used with AI-powered bioreactors can be 400 times more effective than trees in reducing carbon. As the world is behind in the number of trees scientists have told us that we needed to plant, a few decades ago, some have recommended that we need to look at the ocean for carbon solutions as well. Researchers have observed that algae absorbs carbon in the atmosphere, increases in size, and after dying sinks to the bottom of the ocean taking the carbon it absorbed with it. Some researchers want to add more iron to the ocean, to boost phytoplankton (a form of algae) in the ocean to accelerate carbon reduction, a process that has been named ‘iron fertilisation.’ As with all geoengineering projects, a lot of scepticism remains, as there is a lack of understanding on the effects it may cause on marine life or if an experiment goes wrong.

  2. Water waste management 
    Studies in the USA have shown that certain strains of algae can be used to restore oxygen levels in water and reduce ammonia in septic waste water after it has gone through treatment. It can also be used to clean water high in heavy metals or toxins, according to the Deep Green Biotech Hub.

  3. Architecture 
    A company in Hamburg, Germany has created an algae façade panel that fosters trapped algae between glass panels, providing a solution for tinted windows which allows for light shielding, heat protection and carbon reduction. The algae in the panels can also be harvested and fermented to create energy through biogas.  

  4. Plastic 
    Plastic is primarily made with fossil fuels, and is a major pollutant, but designers are looking into producing single-use and reusable plastics made from algae that can be produced sustainably and break down into the environment after two to three months. 

  5. Fuel
    According to CSIRO the oil and other lipids in algae, as well as the microalgal matter itself have the potential to be a good biofuel for motor vehicles.

  6. Food and supplements 
    Currently supplement companies use fish and krill to make omega 3 supplements. As fish get omega 3 from the algae they eat, it can instead can be sourced directly from algae itself as an animal-friendly alternative. Sourcing omega 3 from algae instead of fish is more sustainable because of how easily and rapidly algae grows, especially in warming conditions, as well reducing strain on fish populations. The remaining portions of the algae after the omega 3 is extracted can be used for protein and carbohydrates, and as an alternative to salt. Algae has an ‘umami’ taste and an earthy or fishy flavour profile which is complementary to a lot of seafood and other savoury dishes. One of Green Light’s participants, Sea Health Products, has turned golden kelp into granules as an alternative for salt in cooking. 

  7. Clothing
    The natural fibres of algae can be woven into a yarn like fibre for knitting or grown into a mould of a pattern which produces the precise amount of textile needed without any waste. When the clothing isn’t needed, it can break down into nontoxic substances leaving behind no microplastics in the ocean or the wider environment. Dr Mark Liu, a researcher at the University of Technology Sydney told Fashion Journal that algae fabric is still in it’s infancy, with more infrastructure and technology needed to make proper use of it. H&M have used algae for the foam in their sneakers by partnering with Bloom Foam, a company that harvests algae and turns it into shoe foam. 


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