waste- energy- fertilizer
Tuesday, November 3, 2009 at 10:09PM 
Photosynthesis comes first. Plants store the energy as carbohydrates, and then we harvest the crops and leave residues. The residues yield energy, either for us directly or for the micro-organisms that decompose the plant matter. When the process is done, plant-essential nutrients are left.
The first model is biogas generation from farm waste: crop residue, or the more concentrated animal manure. An anaerobic fermentation system extracts methane for domestic cooking, heating and potential electric power generation from the farm waste and the gray water of the residential facility. Batch processing requires an awareness of energy consumption on the part of the residents: more demand may exceed supply and require supplemental inputs such as propane to provide domestic cooking and space heating needs. Surplus production may require methane powered electrical power generation to store temporary surplus on the grid.
The leftover slurry is excellent fertilizer, but to qualify for organic practices and health codes, would need to be applied to perennials, flowers, or green manure crops, or be applied 90 days before harvest.
The second model is to use biomass in the form of orchard prunings as a fuel for domestic space heating. The method is the masonry wood stove (also known as the Russian fireplace or Swedish wood stove.) Small wood scraps are burned in a high oxygen environment to ensure complete combustion with minimal creosote, and the thermal energy stored in a massive thermal structure with considerable surface extraction area for exhaust gasses. The fly-ash that remains is a useful mineral fertilizer.
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