The Owner Built Home & Homestead

(Page 22 of 23)

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Rikard Lindstrom of Tyreso, Sweden, has patented a simple aerobic composting chamber. Its salient feature consists of a sloping (16-degree) bottom to the tank, which provides for a continual movement of the decomposed refuse to a storage chamber as additional wastes are added to the other compartment. The chamber bottom should contain a thick lays (12-inches) of straw or sawdust so that urine will be absorbed and reclaimed. This porous layer of cellulose also provides aeration to the central section of the pile. Lindstrom used a system of inverted U-shaped conduits and ventilation holes to provide adequate aeration. Air circulation is also accelerated through solar-heated flue conversion.

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In Japan, where excreta is traditionally used as a fertilizer, powdered soybean is often added. Enzymes in the soybean speed up the breakdown of organic solids. Kazuyoshi Yamaji of Tokyo holds a U.S. patent on a "powdered deodorizer of the acceleration of ripening of organic fertilization fertilizers." A dried and powdered cereal containing a large quantity of enzyme is first mixed with rice-bran, barley-bran, or wheat-bran. Water is added and it is heaped for fermentation. It is then dried and powdered and mixed with tricalcium phosphate and the powder of germinated seeds of cereal such as barley, wheat, bean, etc. which contains a large quantity of enzyme. Only a small quantity of the finished product need be sprinkled on the excreta.

Bio-Dynamic gardeners use a special preparation—inocula—in making compost humus. The formula is based on the researches of the late Dr. Rudolf Steiner. One of these exotic preparations (502) is made from yarrow blossoms, fermented together with deer bladders over a period of 6 months in earth during the winter.

Using enzymes, hormones, or biocatalysts in the decomposition of organic material and for nitrogen fixation may prove to be an interesting sideline, but none of these inocula are really necessary to a properly balanced compost environment. Organic material contains all the growth factors and vitamins necessary for normal development. These growth factors are produced by micro-organisms in sufficient quantities in a mixed microbial population to meet normal growth requirements.

From the point of view of cost, health, and good design, I recommend the cylinder-shaped structure. The 4-foot diameter structure contains, in its series of levels: Effluent drainage pit, compost chamber, bathroom facility, solar water heater. A very simple slip-form jig can be employed to build the solid concrete walls. The complete unit is available from me for loan to interested people. Floor and roof are cast-in-place concrete. Ideally the unit would be built on a hillside to provide best access to the compost compartment. It can be built as a detached structure or connected to hall, breezeway or directly to sleeping unit. The accompanying drawings and photos best illustrate the structure and techniques of construction.

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