Closed Air Composting

Closed air (anaerobic) composting is done in a closed bin. Anaerobic microorganisms, which produce end products that can smell like rotting eggs, also become involved in the decomposition process. In closed air bins, water is continuously recycled as condensation, which drops back to the mass from the interior of the lid. This process helps the contents of the bin stay damp, a good feature given the Coachella Valley's dry climate.

Materials to Use
Use the same ingredients as the hot compost pile; with closed-air composting. However, kitchen scraps can be added. Do not add meat, bones, oils, fatty foods or dairy products.

The Closed-Air Composting System
Position the compost bin in a sunny spot if possible, to utilize the "glass house effect," which in turn encourages the entry, but not the loss of heat. It is best to have two composting bins; while the first is maturing, the second can be filled.
Bins should be placed on soil that will allow drainage and the entry of earthworms and other beneficial organisms. Some closed-air systems require the bin to be placed over a hole 6-12 inches deep.

Chop or grind large kitchen scraps and yard trimmings into smaller pieces, to hasten the composting process.
Add materials to the compost bin once or twice a week. Try to avoid more frequent opening of the bin, and keep the lid tightly secured. Vary the layers of material, or mix them together when adding to the bin.
It is very important that the compost material does not dry out. Add water, if necessary, to keep the compost moist. If the compost becomes sloppy, add dry ingredients to the mixture.

You do not need to turn or aerate the contents of the bin.ﾠ Continue adding materials to the bin until it is full. The materials will reduce significantly in volume as the composting process takes place. When the bin is completely full, cover the compost with a thin layer of soil and allow it to sit for 12-16 weeks.

The compost on the bottom of the pile will mature first. Some bins have a bottom opening to harvest this finished compost, while others require the bin to be pulled up over the mature compost.
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