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Phoenix666 [soylentnews.org] writes:

Last August, the seasonal harmful algal blooms (HABs) in Lake Erie grew so extreme that they poisoned the water system in Toledo, Ohio, leaving nearly half a million residents without drinking water. But a few researchers at the time collected some of the toxic HABs, and have now shown that, by heating them at temperatures of 700-1000 °C in argon gas, the HABs can be converted into a material called "hard carbon" [techxplore.com] that can be used as high-capacity, low-cost electrodes for sodium-ion (Na-ion) batteries.
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"Harmful algal blooms, caused by cyanobacteria (or so called 'blue-green algae'), severely threaten humans, livestock, and wildlife, leading to illness and sometimes even death," Deng told Phys.org. "The Toledo water crisis in 2014 caused by HABs in Lake Erie is a vivid example of their powerful and destructive impact. The existing technologies to mitigate HABs are considered a 'passive' technology and have certain limitations. It would significantly and broadly impact our society and environment if alternative technologies could be developed to convert the HABs into functional high-value products."

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