Tag: zinc

Algae Mops Up Heavy Metals

The Great Lakes suffer from all kinds of pollution, but among the most dangerous pollutants from industrial waste are mercury, cadmium, and zinc. Researchers at Ohio State University are perfecting a way to clean up those heavy metals…. using algae. The Great Lakes Radio Consortium’s Bill Cohen explains:

Transcript

The Great Lakes suffer from all kinds of pollution, but among the most dangerous pollutants from industrial waste are mercury, cadmium, and zinc. Researchers at Ohio State University are perfecting a way to clean up those heavy metals – using algae. The Great Lakes Radio Consortium’s Bill Cohen explains:

Picture using algae as a sponge. The one-cell
plants attach themselves to the polluting metals…you pull them out of the
water…squeeze out the metals in an acid solution….and re-use the algae
sponge 30 times. Researcher Richard Sayre has genetically altered the
algae to sop up more pollution than ever:


“We’ve improved their ability to sequester and bind these heavy metals by a factor of five.”


Sayre stresses – the algae itself won’t be put
into the lakes free-floating …and it won’t even be living.


“The metal-binding capacity is about three times greater when they’re dead than when they’re alive.”


The next step for Sayre…convincing a few cities to let him put this algae into pollution control equipment so he can prove to them it’s a cheap and effective way to stop industrial waste before it gets into waterways.


For the Great Lakes Radio Consortium, I’m Bill Cohen.

A ROAD SALT SUBSTITUTE? (Short Version)

  • Road salt spread on the streets of Ann Arbor, MI has a corrosive effect on this sewer grate. Many cities and states are looking for a less damaging, and more environmentally sensitive alternative to road salt.

Many highway departments in the Midwest are looking into alternative ways to remove snow and ice from streets. The Great Lakes Radio Consortium’s Jonathan Ahl reports:

Transcript

Many highway departments in the Midwest are looking into alternative ways to remove
snow and ice from streets. The Great Lakes Radio Consortium’s Jonathan Ahl reports:


Most states and cities use rock salt and Calcium Chloride to keep streets from becoming
slippery and dangerous, but several companies are marketing additives to salt that they
say are just as effective, but do not include many of the pollutants that come from salt.
Graig Phelps is with Natural Solutions, a company that makes one of the additives:


“There’s a definite move to limit the nutrients that are applied through snow and
ice control. Phosphorus, copper, zinc, irons, and your heavy metals, which also have a
tendency to accumulate.”


Phelps says in addition to reducing pollutants, the additives also cut down on wear and
tear of streets and trucks because the bio-based products are non-corrosive. While the
use of the corn-based de-icers is on the rise, many cities say they have to wait until the
price comes down before converting to the new products. For the Great Lakes Radio
Consortium, I’m Jonathan Ahl.