Kevin,
Charcoal has been used in animal feed and in animal bedding. The benefits don't immediately come to mind but it is in the literature. We had lunch in Kyoto with a manager of a sustainable farm near Hong Kong who was using charcoal in bedding for broilers. Palatability is probably not an issue if it is blended with normal feed. Volume and density of feed components are issues that we face with all natural additives in large scale, high rate, production. Charcoal would not be used by large producers unless there was a clear benefit that it would offset loss in weight gain, egg production, milk production or solve other issues like disease. We fed ash from broiler litter that was enriched in phosphorous to recycle P from the feed and to displace purchased dicalcium phosphate. Birds were healthy and growth was good but the strategy was rejected because pyrolysis and combustion in the presence of chlorine (from salt in the bird's diet) forms detectable dioxin. It is nowhere close to toxic levels but because it is detectable producers will not use it as a feed ingredient. This may not be an issue at the rural household level if there are other benefits. We see larger quantities of sand, or grit, in turkey litter than in broiler litter. It's hard to beat the price of sand or clay. The best way to recycle nutrients from poultry litter and manure may be by composting it with biochar, as described by Christoph Steiner, or by combining it with biochar and clay in an organo-mineral complex (synthetic terra preta, STP) as described by Dr. Stephen Joseph and researchers in New South Wales. Why burn nitrogen? My favorite presentation in Kyoto was titled" Environmental Improvement and Production of Delicious, High Quality Sake and Cheese through Use of Buried Charcoal," by Takemichi Tsurumi. Hopefully the presentation will appear on the Japan Biochar Association or conference website. http://www.geocities.jp/yasizato/JBA.htm Japanese have many uses for charcoal like soft charcoal for tea ceremonies and hard charcoal (binchotan) for pottery making. Tsurumi described two uses: 1. Producers of Sake in Chiba Prefecture "Hard charcoal and powdered charcoal are buried and layers of charcoal are spread on the premises. Through iyashirochi-ka the activity of micro-organisms is improved and delicious, high quality sake is produced. Over 30 tons are used in 14 places on the premise." 2. An NPO in Hokkaido "With buried charcoal in houses, cattle barns, production facilities, cheese factory, maturation room, and fields, micro-organisms are activated through iyashirochi-ka, and delicious, high quality cheese is produced. In both cases, production makes improved use of micro-organisms in conjunction with carbon storage through the iyashirochi-ka that accompanies carbon storage, delicious sake and cheese are produced." In this case Tsurumi explained that only wood buildings can be used Metal building "interrupt the electron flow." iyashirochi-ka seems to be an intriguing process for someone to pursue. The examples were given for small farms. This might be a strategy that could be used for rural farmers making charcoal for biochar or cooking. Unless there is further interest from the stoves community this discussion should move to the biochar list. Tom From: [email protected] [mailto:[email protected]] On Behalf Of Kevin Sent: Monday, October 31, 2011 4:44 PM To: Discussion of biomass cooking stoves Subject: Re: [Stoves] [biochar-production] Re: Stoves Digest, Vol 14, Issue 17 Dear Tom Given that biochar seems to be a good addition to manure and compost, what about purposely adding it to food scraps intended for animal feed, for the medicinal benefit that ingested charcoal may provide? 1: Is there any known detrimental effect to animals consuming charcoal? 2: Is there any reason to believe that animals would find charcoal fines in their food as unpalatable? 3: Would chickens perhaps seek out charcoal particles as a "grit substitute?" If nothing else, at least manure from animals fed charcoal would produce "pre-biocharred manure." :-) Best wishes, Kevin ----- Original Message ----- From: Tom Miles <mailto:[email protected]> To: 'Discussion of biomass cooking stoves' <mailto:[email protected]> Sent: Monday, October 31, 2011 6:17 PM Subject: Re: [Stoves] [biochar-production] Re: Stoves Digest, Vol 14,Issue 17 Frank, I can understand that carbon in different forms degrades at different rates. And dry AD systems are interesting. When I add char to household food scraps it makes what appears to be a better quality of compost. I am also aware that In the developing world these same scraps might be used as feed. Maybe Paul, Art, or others have had experience with adding TLUD char to compost from food waste, litter, or manure. Thanks Tom From: [email protected] [mailto:[email protected]] On Behalf Of Frank Shields Sent: Monday, October 31, 2011 1:45 PM To: 'Discussion of biomass cooking stoves' Subject: Re: [Stoves] [biochar-production] Re: Stoves Digest, Vol 14, Issue 17 Tom, The C/N ratio is almost useless in when preparing compost formulations contrary to what most people think. The carbon is determined on a Total Carbon and so is nitrogen. What we really need is available C and N and the availability changes during the composting process. If you add wood chips to a compost they will be there in a large part when the compost is finished - so should not be counted. Oils and other lipids will biodegrade quickly lowering the pH. Then it's the slow release of carbon to available form as the process continues. With nitrogen becoming available as ammonia the pH goes up. It can out-gas and be lost so availability of nitrogen should also be a continuous process. All this occurs with in vegetative material that has wood chips added only for porosity. So a measure of total N and total C at the beginning has little use and is only a guideline. Real way is to measure the Total N and C at the beginning and again at the end to determine the C removed as CO2 IMO. But to answer your question you might as well test for Total N and total C to get a C/N ratio with the char along with the wood chips. As for food scraps; They are the hardest to compost unless well mixed in with a lot of other materials. That because they are readily available C and N and react fast and that causes smells and fluctuation in pH, hugh oxygen demands making anaerobic conditions etc. New interest is AD dry systems then aerobic composting remaining material that have been partial stabilized. Frank From: [email protected] [mailto:[email protected]] On Behalf Of Tom Miles Sent: Monday, October 31, 2011 1:01 PM To: 'Discussion of biomass cooking stoves' Subject: Re: [Stoves] [biochar-production] Re: Stoves Digest, Vol 14, Issue 17 Frank If I am taking char from a TLUD and adding it to cooking scraps for compost do I ignore the carbon in the char when calculating the Carbon to Nitrogen ratio? Thanks Tom From: [email protected] [mailto:[email protected]] On Behalf Of Frank Shields Sent: Monday, October 31, 2011 12:05 PM To: 'Discussion of biomass cooking stoves' Subject: Re: [Stoves] [biochar-production] Re: Stoves Digest, Vol 14, Issue 17 Dear Tom, For compost the purpose is to 'stabilize' the carbon to a point the environment can replenish oxygen and nutrients at a rate plants and biota is not effected. When in an ag situation we have growers ready to supplement nutrients (nitrogen) at the ready when plants or lab tests indicate needed. Stabilized values I like to see is < 4 mg CO2-C / g organic matter / day. This dry weight. But many people use 8 mg CO2-C as a stabilized value. I think biochar is not even in the picture for nitrogen up-take or oxygen depletion in an ag soil because they will be so low. Perhaps over time in a non ag environment the carbon may deplete the nitrogen - put more likely just hold the nitrogen from being leached for later use. Frank From: [email protected] [mailto:[email protected]] On Behalf Of Tom Miles Sent: Friday, October 28, 2011 11:50 AM To: 'Discussion of biomass cooking stoves' Subject: Re: [Stoves] [biochar-production] Re: Stoves Digest, Vol 14, Issue 17 Crispin, Frank, Apart from fraud, it is nice to have a general indication of how much of the fuel will convert to a gas before burning and how much would, in theory, remain as char. IN practice you oxidize part of he "fixed" carbon as well. In carbonization the volatile carbon is a useful indicator of the extent of carbonization. We look for volatile carbon to be less than 20% for most applications. That does not mean that all biochar needs to be less than 20% volatile carbon. Other measures of labile carbon would be helpful. For biochar applications it would be useful to know how much of the carbon is likely to be consumed by organisms and will thereby have a demand on nitrogen or other nutrients. I have assumes that is the volatile fraction. How much char C do you include in calculating a C:N ration for composting, for example? If you intend to deliver a char to a uses that will supply it's own N how much to you have to add? How much char from stoves can you estimate will have a demand on plant nutrients if used as biochar? Tom From: [email protected] [mailto:[email protected]] On Behalf Of Crispin Pemberton-Pigott Sent: Friday, October 28, 2011 1:09 PM To: 'Discussion of biomass cooking stoves' Subject: Re: [Stoves] [biochar-production] Re: Stoves Digest, Vol 14, Issue 17 Dear Frank My main disagreement is the term Fixed Carbon and that it means the total weigh DAF where it should be a measure of carbon in that fraction. I will need to get over that. I assure you that Fixed Carbon does not have a clear and scientific meaning. I have given up hope with analyses that use the term. That means, it is 'helpful' but not an exact measure of anything. It really is taken to mean the carbon that happens not to disappear when the sample is treated in a certain way. Treat it in another way and the 'fixed' portion changes so it is an inherent property of the protocol times the fuel, not a property of the fuel alone. The coal industry is so large that they feel they can get away with internal definitions and that makes huge problems for stovers because we never really know what we are being handed to burn. With biomass that has historically been the 'chemistry' of the fuel contents. But the principal users of 'fixed carbon' are the coal consumers like power stations. To give the DAF value of anything is misleading because we need to know what % it is of the fuel, not of part of the fuel. There are many tricks played by people promoting processed fuels that involve switching the fuel energy content numbers during the conversation. For example, people will report the 'as received' heat content as the fuel's heating value (which is true) and then point out that their 'Processing' increases this to a much higher 'DAF value' showing a '60% increase in energy per kg' even though it takes energy to remove the water and calculate out the ash. Plain fraud. Whenever someone reports the energy content you have to not only ask on what basis the figure was derived, but also investigate the protocol to see if it really is what it claims to be. Many people believe that there is free energy to be harvested in this manner. Regards Crispin _____ _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists .org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/ _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1834 / Virus Database: 2092/4587 - Release Date: 10/31/11
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