Sunday, November 06, 2011

View from space: Toxic algae bloom in Lake Erie

Landsat-5 satellite images acquired in early October, 2011 revealed the worst algae bloom North America’s Lake Erie has experienced in decades. The bloom is primarily microcystis aeruginosa, an algae that is toxic to mammals, according to the Great Lakes Environmental Research Laboratory. The reasons for this year’s giant bloom are complex, say scientists, but might be related to a rainy spring and invasive mussels.

See pictures and more of the story at:

http://earthsky.org/water/view-from-space-toxic-algae-bloom-in-lake-erie
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Source: EarthSky.org Water Blog

Thursday, June 23, 2011

Algal Turf Scrubbers

An article published in the June issue of BioScience describes the early scale-up stage of a new biotechnology with environmental benefits and possible commercial potential. Algal turf scrubbers are field-sized, water-treatment systems that can extract excess nutrients from streams, canals, and lakes polluted by agricultural, domestic, and some industrial runoff. They use sunlight as their principal source of energy and simultaneously restore oxygen levels. The devices work by pulsing contaminated water across algae that are allowed to grow on screens. Algal turf scrubbers produce waste suitable for use as a nitrogen- and phosphorus-rich fertilizer. Some algal turf scrubbers can even operate in open water, thus minimizing loss of agricultural land to the systems.

The BioScience article, by Walter H. Adey of the Smithsonian Institution, Patrick C. Kangas of the University of Maryland, and Walter Mulbry of the US Department of Agriculture, notes that the need to clean wastewater and various types of runoff contaminated with nitrogen and phosphorus is immediate in many places where natural waters are polluted.

The article stresses that algal turf scrubbing is not likely to ever be profitable just as a way of making a fuel crop. Algal turf scrubbing could become common if the economic value of nutrient removal can be applied to the cost of building and running the units. That might depend on public policy that imposes a predictable cost on pollution of natural waters.
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Source: NALMS Notes - June 2011
http://www.nalms./org

Saturday, March 26, 2011

Newly Discovered Group of Algae Live in Both Fresh Water and Ocean

ScienceDaily (Jan. 21, 2011) — A team of biologists has discovered an entirely new group of algae living in a wide variety of marine and freshwater environments. This group of algae, which the researchers dubbed "rappemonads," have DNA that is distinctly different from that of other known algae. In fact, humans and mushrooms are more closely related to each other than rappemonads are to some other common algae (such as green algae). Based on their DNA analysis, the researchers believe that they have discovered not just a new species or genus, but a potentially large and novel group of microorganisms.

Read the rest at http://www.sciencedaily.com/releases/2011/01/110120151633.htm

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