Tag: gypsum

Re-Using Power Plant Pollutant

Coal fired power plants use chemical scrubbers in their
smokestacks to reduce pollution. Now researchers are working on
ways to re-use what’s scrubbed out of the stacks. The Great Lakes
Radio Consortium’s Fred Kight has more:

Transcript

Coal fired power plants use chemical scrubbers in their smokestacks to
reduce pollution. Now researchers are working on ways to re-use what’s
scrubbed out of the stacks. The Great Lakes Radio Consortium’s Fred Kight
has more:


Warren Dick is a soil scientist at Ohio State University. He’s been
studying synthetic gypsum, which comes from coal-fired power plants that
use scrubbers to reduce sulfur dioxide emissions. While nobody wants sulfur
in the air we breathe, Dick says it is often needed by farmers for some of
their crops.


“Sulfur is one of five or six major plant nutrients that are required for good
plant growth, and our soils are becoming deficient in sulfur. We’re not
getting it out of the atmosphere as much anymore.”


Dick’s research shows crops do better using synthetic gypsum as a sulfur
fertilizer. Coal is burned to generate more than half of the electricity in
the U.S., but it results in approximately 120 million tons of waste
each year, and Dick says the tonnage is likely to increase as
additional clean air measures are imposed.


For the GLRC, I’m Fred Kight.

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Solution for Arsenic in Drinking Water?

  • Researchers from the University of Illinois have discovered a way to remove arsenic from drinking water at its source. (photo by David Guglielmo)

Researchers believe they have found a way to reduce
arsenic levels in drinking water. They say, for people to drink water from wells or aquifers, the solution starts at the source. The Great Lakes Radio Consortium’s Jeff Bossert explains:

Transcript

Researchers believe they have found a way to reduce arsenic levels in drinking water. They say, for people to drink water from wells or aquifers, the solution starts at the source. The Great Lakes Radio Consortium’s Jeff Bossert explains:


Chronic exposure to arsenic in drinking water has been linked to a variety of health concerns, including hypertension, cardiovascular disease, and cancer.


Researchers from the University of Illinois collected groundwater samples from 21 wells. They found that the wells with almost no arsenic in the water also contained high levels of sulphate-reducing bacteria, which convert the arsenic into a solid, where it drops out of the water. Dr. Craig Bethke led the study.


“What we’re saying is that if there’s sulfate in the water, then there’s probably sulfate-reducing bacteria active in the subsurface, and that means that a simple field test, which is very inexpensive and very rapid to protect sulfate, could identify safe water sources.”


Bethke says places where aresenic levels are high, sulphate salts, such as gypsum and calcium sulphate, can be injected underground to reduce arsenic levels.


Researchers say this information could prove to be invaluable in places where aresenic contamination is a major problem, including parts of the U.S., Australia, and Mongolia. The researchers’ findings were published in the journal Geology.


For the Great Lakes Radio Consortium, I’m Jeff Bossert.

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