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Science & Technology |
Iceland Discovers "Clean" Geothermal Power Plant Not So Clean |
2009-05-27 |
Yes, Virginia, there really is no such thing as a free lunch.... Iceland officials are discovering that geothermal energy is not as clean as they expected. In 2006, when the Hellisheidi geothermal power plant began operating, about 30 kilometers from central Reykjavik, city residents started noticing that they had to clean their silverware every three to four days instead of every three to four months because it was covered with black soot. Truck drivers who drove daily to sand mines in western Hellisheidi found the rubber in their vehicles' suspension and steering systems became hard and prone to breakage after one year instead of three to five years. Then, in September 2008, people noticed that moss vegetation near the Hellisheidi plant was severely damaged. Reykjavik Energy commissioned research and discovered strong indications that sulfur derived from hydrogen sulfide is the cause of the damage. Mercury was also found in high concentrations in some dead moss. But...but...but geothermal is so earth-friendly! Mother Gaia makes it herself! The damage stems from the steam produced at the plant. Most of this is water, but 0.4 percent of the steam contains gases of various kinds - 83 percent is carbon dioxide (CO2), 16 percent hydrogen sulphide (H2S), and the remainder other gases. Trace elements in the steam include sulphur, mercury, boron, arsenic and aluminium. And none of this, I'm sure, would cause silver to tarnish or rubber to harden and crack. /sarc The environmental impact assessment (EIA) reports assumed that because Hellisheidi is a windy, rainy place, most of the H2S would be transformed into sulphur and washed away into the soil instead of being carried elsewhere. Nevertheless, in 2006 and 2007 several measuring gauges were set up in the capital area to check the pollution levels. The Hellisheidi plant was brought into operation in September 2006. Immediately, increased levels of H2S were seen in Reykjavik, especially when the wind blew from the east or south-east, from the plant to Reykjavik. Because of increasing concerns over H2S levels, more measuring devices are being set up around the city, and the Environment Ministry has requested the Environment Agency to find ways of reducing H2S levels overall. The Environment Ministry is also working towards a new regulation on the release of H2S which will include maximum permissible discharge levels from geothermal plants. World Health Organisation (WHO) guidelines state that exposure to H2S should not exceed 150 micrograms per cubic metre, which Reykjavik has exceeded once so far. Are levels of H2S poisonous to human health? At very high levels, yes, says Thorsteinn Johannsson, an air quality officer with the Environment Agency. "But the levels found in Reykjavik would not cause health problems. On the other hand, we know very little about the long-term effects of H2S on health. Iceland would be a good place to research this," he said in a recent radio interview. I'm sure the Icelanders won't mind being guinea pigs for you, Mr. Johannsson. |
Posted by:Barbara Skolaut |
#11 Hydrogen disulphide is more toxic to humans than is hydrogen cyanide. It's just that the H2S smells so bad that you leave the area. People have been killed by natural emissions of H2S though. |
Posted by: Aussie Mike 2009-05-27 23:41 |
#10 If they have above ground power lines they could have serious problems as well as the insulation degrades. Ummm, above ground power wires are NOT insulated, they're bare wire, almost always aluminum with a strong steel wire core, Insulators are those wrinkled looking glass things that suspend the wires and keep them from touching each other. If you Raise up a ladder and touch a wire, you're dead. |
Posted by: Redneck Jim 2009-05-27 22:35 |
#9 Yes, Virginia, there really is no such thing as a free lunch.... But we're all still getting ponies, right? 'Cause I still want one even if I have to scrap the precipitated sulfur off its hide on a daily basis. |
Posted by: SteveS 2009-05-27 16:11 |
#8 (EIA) reports assumed that because Hellisheidi is a windy, rainy place, most of the H2S would be transformed into sulphur and washed away into the soil instead So Acid Rain is OK. |
Posted by: Phil_B 2009-05-27 15:26 |
#7 So I guess Mother Gaia cuts nasty ones, huh? |
Posted by: tu3031 2009-05-27 15:15 |
#6 Those poor, dirty Icelandic girls |
Posted by: Chuck Simmins 2009-05-27 14:10 |
#5 That geothermal is a dirty operation has been well known since the thirties, maybe before. |
Posted by: Kelly 2009-05-27 14:03 |
#4 What?! Gases from the earth can kill you and do bad things?! But but...they're ALL NATURAL! How dare mother nature do things that can hurt you. We should beat her up. /sarc Sorry guys, volcanic vents and the like are well, DANGEROUS. |
Posted by: Silentbrick 2009-05-27 12:03 |
#3 Yep, and more people die annually from skin cancers created by nature's own Sun than ever from nuke plants in this country. Solar is not safer, you just can't do anything about it [other than live in a cave or missile silo]. |
Posted by: Procopius2k 2009-05-27 11:11 |
#2 So, Mother Gaia farts and the Icelanders have to clean their silverware. Life is like that. Surely there is at least one engineer in Iceland who is chanting "I told you so". |
Posted by: Richard of Oregon 2009-05-27 10:32 |
#1 If they have above ground power lines they could have serious problems as well as the insulation degrades. |
Posted by: tipover 2009-05-27 10:14 |