Biochar May Help Fight HABs

  Algae Europe December 2022
Biochar

Cyanobacteria in the St. Lucie Estuary can release toxins that affect the liver and nervous system. Credit: Greg Allen/NPR

by Ryan Randall, Florida Institute of Technology

Toufiq Reza, biomedical and chemical engineering and sciences assistant professor, and Spencer Fire, ocean engineering and marine sciences assistant professor, both at Florida Institute of Technology (FIT), have collaborated in researching mitigation and control of harmful algal blooms. Their goal is to utilize locally produced low-cost sustainable biochar to control harmful algal blooms in Florida’s St. Lucie Estuary, Indian River Lagoon, Tampa Bay Estuary and Sarasota Bay.

The biochar, a porous carbon material, is created using waste biomass, such as agricultural wastes, as well as sargassum, a floating, seaweed algae that has been in the news recently for overtaking beaches in South Florida and Mexico. Using a high-temperature retort — like a furnace — the waste is turned into biochar, which would be then spread across the lagoon water. As with the activated carbon in a Brita or PUR water filter, the biochar would absorb the toxins in the water, and ultimately fall to the bottom, trapping the toxins in the process.

“Our goal is to use that biochar to remove toxins from different harmful algal blooms like red tide, pyrodinium, and blue-green algae,” Dr. Reza said. “So far, the result has been amazing.”

It has been an eye-opening experience for students, he added. “Students have been highly motivated. For example, originally from Jamaica, Cadianne Chambers, a chemical engineering Ph.D. student, has seen firsthand the harmful algal bloom and sargassum in her country. She’s been excited about how effective biochar could be to mitigate harmful algal blooms.”

“Other undergraduate students, like Russel Smith from Ohio and Savannah Grimms from Illinois, are also aware of the harmful algal bloom devastations on the Great Lakes and they are excited to find an engineering solution using their engineering knowledge.”

Drs. Reza and Fire met in 2019, and the following year they began collaborating on research proposals. The ability to complement each other’s research has led to this collaboration, with the goal of improving the community around them. Having lived near the Indian River Lagoon for some time, Dr. Fire was familiar with a lot of the effects that harmful algal blooms have on human and wildlife health and water quality. Coupled with Dr. Reza’s background in chemical engineering, the two have been able to turn Dr. Fire’s analysis of water quality issues into green and sustainable ways to solve the problems.

The projects have also led to work with community members such as a local biochar producer in Indiantown as well as FIT alumna and owner of Treasure Coast Shellfish, Nicolette Mariano, who is on the research team’s advisory board.

The opportunity to assist businesses is something that has added an extra layer to Dr. Fire’s side of the research. Another FIT alumnus, David Tomasko, executive director of Sarasota Bay Estuary Program, aims to reduce the negative impact of Sarasota Bay from red tide. Biochar could be a potential solution to this problem.

“Someone who owns an aquaculture pen and has a big crop of oysters or shellfish, and then red tide comes in, they could lose their entire crop overnight if there’s a big harmful algal bloom,” Dr. Fire said. “So, having an actual application that can be used by folks to potentially not have a catastrophic business loss is one of the times I’ve ever been able to look at a problem and say, ‘Hey, there’s a solution for that.’”

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