In recent years, India has been making strides to reduce its environmental impact. Algae cultivation could be the answer to many of the nation’s environmental problems, and many organisations are exploring the mass production of microalgae like Spirulina and Chlorella. Quick-growing and packed full of nutrients, microalgae could replace animal feeds, enhance nutritional supplements, and even power our society through the use of biofuels.
“I see that microalgae can play critical roles in many aspects of the circular economy, including the cycling of carbon, nitrogen, and phosphorus that impact the production of food and feed, fertilisers, fuels and chemicals, wastewater treatment, environmental remediation, and metal recovery,” said Jianping Yu, a researcher at the National Renewable Energy Laboratory.
Spirulina cultivation Credit: FlickrCarbon capture
India's carbon dioxide emissions surpassed 2.5 billion tons in 2022. Microalgae can capture substantial amounts of carbon dioxide from the atmosphere, actively reducing air pollution as they grow. By integrating microalgae cultivation with emission-heavy industries, India could turn an ecological crisis into an opportunity for carbon capture.
Meanwhile, India’s Ministry of Science and Technology’s INSPIRE program (Innovation in Science Pursuit for Inspired Research) has spent the last decade advancing biodiesel production from microalgae. Led by T Mathimani from the National Institute of Technology (NIT), the initiative aims to create a sustainable, cost-effective biodiesel production model. INSPIRE's pioneering work marks a critical step towards a future where clean, renewable fuel is the norm.
Oceanic algae farming
Oceanic microalgae farming, which involves cultivating various microalgae species in seawater, is emerging as a popular solution due to its high carbon absorption through photosynthesis. The process not only helps combat air pollution but also avoids competition for arable land. Seawater, naturally rich in essential nutrients like phosphorus, provides an ideal growing environment for these tiny powerhouses. Compared to terrestrial plants, microalgae can grow up to a hundred times faster, presenting a highly efficient solution for sustainable agriculture and carbon capture.
Despite its promise, large-scale microalgae farming is not without its hurdles. “Crop protection is a big challenge in large-scale microalgae cultivation. Microalgae could be outcompeted by other algae, or consumed by predators like ameba. Weather events such as heavy rainfalls or gust winds can also lead to crop loss in outdoor ponds,” Yu said. Managing these challenges is essential to maintaining the viability of microalgae farming as a sustainable resource.
As the world seeks sustainable alternatives to resource-heavy crops, microalgae emerges as a remarkable solution, growing at astonishing rates and requiring minimal resources. In carefully designed vessels called photobioreactors, microalgae flourish with little more than light and nutrients, offering a powerful approach to curb the environmental toll of traditional agriculture.
Photobioreactor Credit: IGV Biotech, CC BY-SA 3.0Photobioreactors, transparent chambers that harness sunlight, provide the ideal setting for microalgae growth. Light seeps in through the clear walls, maximising exposure, while osmosis between seawater and freshwater in the chamber intensifies nutrient concentration in the algae, fostering rapid growth. In fact, some microalgae species can be harvested twice a day, underscoring their unmatched efficiency.
Greener feed
By integrating microalgae into livestock feed, we could sharply reduce the need for traditional feed crops like soy and corn. High in essential vitamins (A, B1, B2, B6, B12, C, E) and minerals (such as potassium and calcium), microalgae offer a nutrient-rich feed that also saves freshwater and prevents deforestation. For livestock, it promises not only improved health but also a natural supplement, further benefiting agricultural sustainability.
Microalgae’s nutrient profile doesn’t just benefit animals; it’s equally powerful as a human supplement, containing essential vitamins and minerals that bolster health. This superfood grows with minimal inputs, adding a potent yet environmentally friendly nutritional source to our food options.
Plastic-free future
As scientists race to replace petroleum-based plastics, microalgae show potential as a base material for eco-friendly composites. By blending microalgae into bioplastics, researchers are tapping into a renewable resource to craft durable, degradable materials–one more step towards a world free of plastic waste.
From efficient feed to plastic alternatives, microalgae could transform our approach to sustainability, combining ecological benefits with practical applications. As India faces the challenge of sustainable energy, microalgae offers a promising solution that could transform biofuel production. Heterotrophic microalgae, which can convert organic compounds into lipids, present a green pathway to biodiesel production. In addition, microalgae can be used to produce bioethanol, making it a versatile option in the quest for eco-friendly fuel. With its ability to grow quickly and thrive in diverse conditions, microalgae could reshape fuel production on a global scale.
Green alternative
Compared to livestock farming and other resource-intensive agriculture, microalgae farming has minimal environmental impact. Growing microalgae in seawater reduces the need for arable land and conserves freshwater, which is critical in a country like India, where water scarcity is a pressing concern. By utilising seawater, microalgae cultivation avoids the high freshwater demands of traditional crops, saving precious resources and reducing waste.
Microalgae have the natural abilities to absorb carbon dioxide through photosynthesis. This ability can help reduce global warming as a whole if the carbon absorbed into microalgae is not released back into the atmosphere.
Microalgae’s natural photosynthesis process captures large amounts of carbon dioxide, actively helping to mitigate climate change. With its rapid growth rate, microalgae offers a faster, more efficient option for reducing pollution than most terrestrial plants.
“Microalgae have the natural abilities to absorb carbon dioxide through photosynthesis. This ability can help reduce global warming as a whole if the carbon absorbed into microalgae is not released back into the atmosphere. For example, if the algal biomass is used to produce polyurethane that is incorporated into furniture, the carbon is locked away at least for decades,” said Yu.
Cleaning polluted waters
Diseases from polluted water, such as Hepatitis and Cholera, affect millions across India, and microalgae offers another critical benefit: its ability to absorb heavy metals. Using biosorption, bioaccumulation, and metallic transformation processes, microalgae can remove toxins from oceans and rivers, improving water quality and ecosystem health. Studies from 2022 confirm that Indian waters have alarmingly high levels of heavy metal pollution, underscoring the need for effective, natural solutions like microalgae to restore balance. The natural filtration process could be a game-changer for water-stressed regions and polluted rivers across the country.
The microalgae cultivation field is only now starting to be taken seriously, but it may have significant effects on food waste in India and the world as a whole. Through the use of microalgae as a sustainable food and fuel source, carbon emissions and deforestation will be greatly reduced.
Although the future of environmental sustainability will be a challenging road for India, emerging agricultural technologies like oceanic microalgae farming are leading the effort to create a greener planet.