Biodiesel has long been considered a cleaner substitute for fossil fuels, but high production costs have limited its wider use. Now, researchers say a new method using algae and discarded oyster shells could significantly reduce those costs and make the fuel more accessible, Tech Explorist reported.
A research team from Nicholls State University has developed a process that replaces traditional crop-based raw materials with algae, which grow quickly and do not require farmland. The study was presented at the American Chemical Society Spring 2026.
The researchers also found a way to use oyster shells, often treated as waste, to support the fuel-making process. By heating crushed shells, they converted calcium carbonate into calcium oxide, which acts as a catalyst to speed up the chemical reaction needed to produce biodiesel.
Using this method, the team extracted oil from locally sourced algae and combined it with methanol and the shell-based catalyst under controlled heat. The process produced biodiesel along with glycerin as a byproduct.
Early estimates suggest that using oyster shells as a catalyst could cut production costs by 70 to 85 percent compared to existing commercial options, making biodiesel far more affordable.
The team is now refining the process by adjusting factors such as the amount of catalyst used and the ratio of methanol to oil. They are also testing whether the fuel meets global quality standards.
One of the key challenges in biodiesel production has been ensuring that the energy produced is greater than the energy used to make it. High costs and inefficiencies have slowed its adoption worldwide.
Researcher Bello Makama noted that energy balance remains a major concern, with production often costing more than the value of the fuel produced.
The team is now working with industry partners to test the biodiesel in real-world conditions, including performance in cold weather and safety requirements.If successful, the approach could be scaled globally, as algae can grow in many environments and shell waste is widely available. Researchers say this could allow communities to produce their own low-cost renewable fuel, reducing reliance on fossil fuels and supporting cleaner energy systems.
