Vermicomposting vs Composting


In-vessel composting refers to a group of methods which confine the composting mass within a building, container or vessel. There are a variety of in-vessel methods with different combinations of vessels, aeration devices, and turning mechanisms. Among these, the most widely utilized are continuous vertical reactors, and horizontal reactors.

In continuous vertical reactors, the materials usually are loaded through the top of the reactor and discharged from its bottom. Oxygenation is provided by forcing air up from the bottom through the composting mass. These reactors can process large amounts of material (as much as 2,000 cubic meters) and may be as high as nine meters. However, the height is extremely critical and masses higher than three meters lead to a serious problems in ventilation.

In horizontal reactors, the materials are arranged along the length of the unit and the depth never exceeds two or three meters. The principal advantage of these systems is the possibility to control the process, resulting in a shorter duration of the thermophilic stage than in the open systems. Because oxygen is supplied either by turning or by aeration, the composting mass can be uniformly oxygenated and the temperature can be readily controlled.

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