The methane reaction does NOT take place in environments with free oxygen. It only takes place in anoxic environments, like deep weathering, where the oxygen is already used up, in ocean bottoms that are composed of peridotites; the sea water penetrates in deep cracks, and reacts with the (reducing) rock, by which methane is formed, and the methane on Mars has probably a similar origin. It has advantages too, like the production of a richer biogas , while at the same time the CO2 in the biogas is not emitted to the atmosphere. Sensational examples are found in SW Turkey (the Yanartasi = the eternally burning rock), and on Luzon/Philippines, where it is called the Fuegos Eternos (the eternal fires). I attach a romantic description of the Turkish example, which I will revisit in May when I will lead a fieldtrip there, Olaf
From: [email protected] [mailto:[email protected]] On Behalf Of Oliver Tickell Sent: maandag 2 februari 2015 14:38 To: Schuiling, R.D. (Olaf); '[email protected]'; [email protected]; [email protected] Subject: Re: [geo]_Re:_A_graphic_to_help_map_the_Carbon_Dioxide_Removal_(“CDR”)_field_|_Deich Interesting! Clearly this reaction is good in a biodigester - but does it also take pleace in ordinary open air/water weathering? If so then it reduces the benefit to be gained from weathering olivine, as CH4 is a powerful GHG. Best, Oliver. On 31/01/2015 12:39, Schuiling, R.D. (Olaf) wrote: And if you add fine-grained olivine to the biodigester you add three advantages: 1. You shift part of the CO2 in the biogas to the liquid as bicarbonate. So the biogas becomes richer 2. The digester doesn’t smell anymore, because the iron in the olivine combines with the H2S as iron sulphide 3. The absolute amount of produced methane also increases thanks to the reaction 6 Fe2SiO4 + CO2 + 14 H2O --> 4 Fe3O4 + CH4 + 6 H4SiO4 . This reaction is catalyzed by the fine-grained magnetite crystals that form, and has been tested at several dutch universities. The reaction is well-known from places where the ocean bottom is composed of olivine rocks, and where seawater seeps into fractures, Olaf Schuiling From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of [email protected]<mailto:[email protected]> Sent: zaterdag 31 januari 2015 2:02 To: [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]> Subject: RE: [geo]_Re:_A_graphic_to_help_map_the_Carbon_Dioxide_Removal_(“CDR”)_field_|_Deich Noah, Nice clear graphic. Love it. Please add "C from N separation" within your Transformation approach. C (carbon) from N (plant nutrients, a big one being nitrogen as ammonia or nitrate) separation can be a fermentation or a chemical process. The most common fermentation is anaerobic digestion (AD). An up and coming chemical process is hydrothermal liquefaction (HL). Both processes economically produce energy in the form of CH4 and longer chain hydrocarbons. Both have a by-product of CO2 at about 40% of the biogas produced. (The HL biogas production is at 200 atm and 350C, which allows for very inexpensive production of pure CH4 separate from the pure CO2.) You should show both separation processes because they each scale much larger than any of the three (Biomass burial, Pyrolysis, or BECCS) you show currently. They scale larger because the plant nutrients are not sequestered with the carbon and they are both economically viable on the energy alone with wet biomass such as seaweed forests: as low as 1% solids for AD and as low as 10% solids for HL. Include an arrow over to "Pure compressed CO2" from each separation process. Your chart will be much more complete and accurate. Thank you Mark E. Capron, PE Ventura, California www.PODenergy.org<http://www.PODenergy.org> -------- Original Message -------- Subject: [geo]_Re:_A_graphic_to_help_map_the_Carbon_Dioxide_Removal_(“CDR”)_field_|_Deich From: Michael Hayes <[email protected]<mailto:[email protected]>> Date: Fri, January 30, 2015 10:49 am To: [email protected]<mailto:[email protected]> Noah, The statement that "...biochar can be burned to create electricity instead of applied to soils as a carbon sink." is questionable as biochar 'fuel' is charcoal. Only that which is buried is 'biochar'. Yet, I believe Ron Larson (IBI) can best express this point. Also, your mission objective of "map the most prominent aspects of CDR" would seem to open up the effort to listing the many important 'prominent aspect' of the biotic approach such as the production of food, feed, fuel, fertilizer, polymers and fresh water (etc.). In short, the biotic can pay for itself while the non-biotic can not. This is a profoundly important aspect which many authors in this field ignore. We must ask ourselves if we wish climate change mitigation to be at the whims of the political purse sting or financially independent and based solely on the science...not the thin ice of political popularity. Best, Michael On Thursday, January 29, 2015 at 10:53:49 AM UTC-8, andrewjlockley wrote: https://carbonremoval.wordpress.com/2015/01/22/a-graphic-to-help-map-the-carbon-dioxide-removal-cdr-field/ Everything and the Carbon Sink Noah Deich's blog on all things Carbon Dioxide Removal (CDR) A graphic to help map the Carbon Dioxide Removal (“CDR”) field JANUARY 22, 2015 For the carbon dioxide removal (“CDR”) field, breadth is simultaneously a blessing and a curse. On the bright side, the numerous approaches to CDR suggest the potential for deploying a diverse portfolio of CDR projects that reduces both the risks and costs of preventing climate change. But the down side of breadth is complexity, which makes the CDR field difficult to explain and envision, and can lead to confusion about how to catalyze development of CDR approaches as a result. In the graphic below, I’ve attempted to categorize and map the most prominent aspects of CDR in as comprehensive and clear a manner as possible:It is critical to note that not all of the elements of this graphic are exclusive to CDR. For example, direct air capture (“DAC”) machines can be used to create hydrocarbon fuels (instead of for carbon sequestration purposes). In a similar manner, biochar can be burned to create electricity instead of applied to soils as a carbon sink. Even more broadly, compressed CO2 can come from many places, including from fossil-fueled power plants with carbon capture and sequestration (“CCS”) systems. Unpacking how each of the elements for various CDR processes fit into wider industrial systems is critical for designing effective strategies for developing various CDR approaches — hopefully this visualization of the field can help with that process -- You received this message because you are subscribed to the Google Groups "geoengineering" group. 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Chimaera.docx
Description: Chimaera.docx
