Crispin,
AD responded right away on June 24 in the digestion list: "Dear Tom, the peels can be charred in a charring kiln of the TLUD as well as of the oven and retort type. If the essential oil has been extracted from the peel, it can serve as feedstock in a biogas plant, but if the essential oil has not been extracted, I don't think that the peel could be digested in a biogas plant as the sole substrate, because the essential oil in the peel may kill the methanogens. But mixed with other material, it can be digested. One would have to conduct experiments to find out the correct ratio of peel to other substances. Yours A.D.Karve" His comments regarding digestion were confirmed by others on the digestion list. Tom From: [email protected] [mailto:[email protected]] On Behalf Of Crispin Pemberton-Pigott Sent: Friday, June 24, 2011 8:32 AM To: 'Discussion of biomass cooking stoves'; [email protected]; AD Karve Cc: 'Discussion of biomass pyrolysis and gasification'; 'For Discussion of Anaerobic Digestion' Subject: Re: [Digestion] [Stoves] [biochar] Orange Peels Dear Tom We did not hear from Dr AD Karve on this. I wonder if a pure orange peel diet would affect his small sucrose/starch biogas digester? Regards Crispin From: [email protected] [mailto:[email protected]] On Behalf Of Tom Miles Sent: 24 June 2011 09:40 To: 'Discussion of biomass cooking stoves'; [email protected] Cc: 'Discussion of biomass pyrolysis and gasification'; 'For Discussion of Anaerobic Digestion' Subject: Re: [Stoves] [biochar] Orange Peels All, Many thanks for the all of the generous suggestions regarding orange peels. We'll compile them and put them on the websites while we determine what is most suitable for the particular application in Southern Africa. I have to admit that when I last looked at a pile of orange peels (in Brazil) I wasn't thinking of how they could be used. It certainly looks like at sufficient scale the limonene may be worth recovering. At smaller scales management (rotting) or use (briquetting, drying, charring) of the peel also seems to have potential. Pigs and chickens would also probably recycle the peel, or make enough of a mess to be incorporated in compost or soil. Feeding to birds with char is not high on my list unless there is a health benefit. Usually the object is to increase weight gain my increasing intake rather than reduce intake with a low density material like char. Regards, Tom
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