Harnessing biodegradable plastics from microalgae cultivated on recalcitrant waste streams

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Approximately 300 million tons of plastics are produced annually on a global scale. Only a fraction of these plastics are recycled and a much larger amount ends up as waste. Plastics in landfills, in water resources, lakes, rivers, and oceans are a serious and growing issue. Of particular concern are micro-plastics (particles of plastic less than 5 mm in diameter), which can be ingested by marine organisms, endangering their life and leading to various downstream environmental problems. In Canada, around 150 billion litres of untreated or under-treated wastewater are introduced into Canadian waterways. The discharge of wastewater into the environment is one of the major causes of harmful algal blooms (HABs), which can have toxic effects on humans, fish, and waterways and economic losses in hundreds of millions of dollars annually. The overall objectives of this strategic grant are to develop new strategies for harvesting biodegradable plastics from microalgae cultivated on wastewater streams, thus, addressing two serious environmental issues simultaneously. Specifically, in this research, (a) we investigate the production of bio-composite plastics from algae ( which are cultured on effluents from a dairy farm); (b) we investigate the expression of the monomer itaconic acid in microalgal-based expression systems; and (3) we evaluate the development of new approaches to use itaconic acid produced from genetically modifed algae grown on farm effluent streams for the preparation of new biodegradable polymers. We work closely in this research project with a large, local dairy farm, utilizing effluent streams from aerobic and anaerobic digesters as substrates for microalgal bioplastics. The research using recombinant microalgae to harvest algal-fiber composites and itaconic acid and ultimately produce biodegradable segments in conventional plastics will lead to economically competitive bio-products which will benefit society, the environment and the economy. The proposed research will lead to new opportunities to develop the rural economy and also train highly qualified personnel in these fields.