When I was a kid, I learnt that carbon dioxide (CO\u2082) makes up around 0.3 % (300 ppm) of the atmosphere. Man-made CO\u2082 output, from burning of fossil fuels to deforestation, has increased this number year after year. In 2013 it first exceeded 400 ppm. Even back in the 1950s, after over century or coal and oil burning, the number was already the highest in 650,000 years. We are still adding CO\u2082 to the atmosphere every year and the amount being added per year is still increasing. As CO\u2082 is a heat-trapping greenhouse gas, this has far-reaching consequences. There are dangerous feedback loops that will amplify the consequences, from increased arctic warming from absorbed sunlight due to melted sea ice to increased methane output from melted permafrost regions. Disappearing mountain glaciers will have effects on rivers downstream.<\/p>\n
As humanity realizes the dangers from changing climate, from rising sea levels to extreme weather patterns, devastating droughts and wildfires, desertification and failing harvests we need to take action. We will need to cut CO\u2082 emissions as much as possible as soon as possible, but we also need to look at ways of binding CO\u2082 that has already been released.<\/p>\n
Some people are trying to make a quick buck on this or to deflect consequences from industries that harm the environment. Because of this, be very skeptical of any claims made for carbon sink technologies that aim to delay the phasing out of fossil energy sources (including but not limited to “clean coal”).<\/p>\n
A couple of years ago a US company called Calera made headlines with bold claims of a process that could act as a carbon sink for CO\u2082 from fossil fueled power stations while producing a product that could be used in place of cement. About 5 % of global CO\u2082 output is from cement production while power stations account for about 1\/3 of CO\u2082 output in the US, therefore this would sound like a win\/win situation. The process would extract calcium from sea water, combine it with CO\u2082 from the smoke stack of a power station and output calcium carbonate (lime stone) as a building material. Calera received funding from ventures capital fund Khosla Ventures and built a prototype plant adjacent to the Moss Landing power station at Monterey bay, California.<\/p>\n
The company has always remained fairly tight lipped about how its process would actually work and what its inputs and outputs would be. However, despite the numerous articles that repeated its ambitious claims, nothing much seems to have come off it since.<\/p>\n
The fact is, their claims were debunked by two critics, Jerry D. Unruh and Ken Caldeira, but relatively little attention was paid by the media to the inconvenient facts they had pointed out.<\/p>\n
Most of the calcium and magnesium dissolved in sea water is either in the form of calcium bicarbonate or magnesium bicarbonate. To precipitate dissolved (Ca,Mg) bicarbonate as solid (Ca,Mg) carbonate, one has to remove CO\u2082, not add it. Calcium and Magnesium dissolved in the ocean is there because rain water absorbs CO\u2082 from the atmosphere and then dissolves lime stone and dolomite rock as it seeps down into the ground before re-emerging in springs and rivers:<\/p>\n
H\u2082O + CO\u2082 + CaCO\u2083 => Ca(HCO\u2083)\u2082
\nH\u2082O + CO2 + MgCO\u2083 => Mg(HCO\u2083)\u2082<\/code><\/p><\/blockquote>\nPrecipitating solid carbonate from dissolved bicarbonate reverses the process and thus releases CO\u2082:<\/p>\n
Ca(HCO\u2083)\u2082 => CaCO\u2083 + H\u2082O + CO\u2082
\nMg(HCO\u2083)\u2082 => MgCO\u2083 + H\u2082O + CO\u2082<\/code><\/p><\/blockquote>\nFundamentally, calcium and magnesium ions (Ca++, Mg++) in sea water are not a viable option for binding millions of tons of CO\u2082 as they are already the end result of a carbon-binding process. Turning bicarbonates into carbonates either releases CO\u2082 or it requires huge amounts of alkaline materials to bind that CO\u2082.<\/p>\n
The truth is, besides CO\u2082 and seawater, Calera’s prototype plant consumes existing stocks of alkaline magnesium oxide left over from previous industrial uses at the site, but those stocks won’t last forever. If one had to replenish these stocks from scratch year after year, this typically would involve the high temperature calcination of magnesium carbonate, which consumes roughly as much energy and produces as much CO\u2082 as making cement does.<\/p>\n
Calera has suggested a few alternatives in place of magnesium oxide as alkaline process inputs for a full scale production system, but these don’t make much more sense either:<\/p>\n
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- Making sodium hydroxide from brine via electrolysis consumes more electricity than can be produced from any power station whose CO\u2082 this process could clean up.<\/li>\n
- Fly ash from power stations can be a low cost source of alkalinity, but only in the case of relatively carbon-heavy coal and not natural gas. Even there the amounts of ash are far too small relative to the amount of CO\u2082 to be absorbed from burning the coal. Cleaning up CO\u2082 from coal using fly ash still leaves you with more CO\u2082 than burning natural gas without cleanup.<\/li>\n<\/ul>\n
Long term, the cheapest way of dealing with rising CO\u2082 levels are not carbon sinks, but not producing the CO\u2082 in the first place. This means reducing energy consumption, a halt to deforestation, switching transport to electricity and producing power from wind, solar, geothermal and other non-fossil energy sources. The sooner we do this, the more livable this planet will remain for its 7 to 12 billion inhabitants this century.<\/p>\n
Further reading:<\/p>\n
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- Examining Calera Corporation\u2019s Claims<\/a><\/li>\n
- Exclusive: Does carbon-eating cement deserve the hype?<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
When I was a kid, I learnt that carbon dioxide (CO\u2082) makes up around 0.3 % (300 ppm) of the atmosphere. Man-made CO\u2082 output, from burning of fossil fuels to deforestation, has increased this number year after year. In 2013 … Continue reading