The system is practicable now. Farmers would have to set up algal turf scrubber (ATS) raceways covered with nylon netting to serve as a platform for algae to grow upon. The capture costs of around US$5 to US$6 per pound of nitrogen and US$25 per pound of phosphorus is about the same as other manure-management practices.
But Walter Mulbry, the USDA microbiologist, also showed that corn and cucumber seedlings could thrive on an organic fertiliser made from the dried-out algae. That might allow farmers to recoup even more of the costs from the ATS system, or perhaps turn a profit if the price is right.
Mulbry has already begun another study to see whether fertiliser made from chicken and poultry litter can also benefit from the algae cleanup system. And he has also begun studying whether the ATS systems can remove nitrogen and phosphorus from estuaries that flow into the Chesapeake Bay, so that they could clean up runoff that has already made it into the water system.
Algae’s versatility has already won over scientists who see it as the biofuel of the future, and the tiny plant organisms have also been proving their worth in scrubbing carbon dioxide and nitrous gas from industrial smokestacks. A company called Algenol has even looked to using algae-derived plastic as a replacement for petroleum-derived plastic.
Even the U.S. Department of Energy and various branches of the U.S. military have begun seriously exploring algae-derived solutions. If that doesn’t entirely ensure a clean future, it at least suggests a future with a scummy color palette ranging from pale to bright green.
[USDA]
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