Pollination Fuels
Wednesday, November 4, 2009 at 2:24PM Energy self-sufficiency is an important goal for the WSU organic farm, and producing fuels for running our vehicles to and from markets would be an important step toward this goal. While BioEthanol production is a potential vehicle fuel source, it has many drawbacks, one of which is the need for energy, land, and nutrients to grow the source crop, and another is the need for energy to distill the Ethanol. The HoneyFuel ethanol system seeks to overcome both of these obstacles by using a by-product of fruit, vegetable and flower production, honey, to produce ethanol which can then be distilled in a passive solar converter.
Honey on its own is not fermentable by yeast because of its low moisture content, however, when brought to the hive as nectar, it is nearly 80% water, and is a suitable medium for yeast growth and alcohol production. To eliminate the need for re-nectaring honey, which would waste water and energy, the HoneyFuel system would maintain yeast colonies within the combs, to begin producing alcohol from the nectar as soon as it is brought in and at its most fermentable. The alcohol produced by the yeast would then be directed out of the comb and directly into a passive, solar, distillation unit, where the alcohol and water would be separated with a relatively low energy input. Because honey is only produced in summer, there would be no need for a supplemental power source or still for the shorter, cooler winter season.
Numbers:
Average hive produces 140 pounds of honey a year, 60 lbs of which is needed for winter. Of the remaining 80 lbs of honey, 79.5%, or 63 lbs is fermentable sugar. Yeast convert sugar at a 50% efficiency rate, meaning that of this 63 lbs of sugar, 31.8 lbs or 4.83 gallons of ethanol can be produced a year. In an apiary of, say, 25 to 40 hives, this would be a total yield of 120 to 190 gallons of ethanol a year.
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