Abstract: A method and an apparatus are provided for aeration of organic material, wherein the organic material undergoes an aerobic composing process, such that air is caused to evenly penetrate the organic material. The organic material is first sealed in a vessel. Air is then delivered to the contents of the vessel such that an air pressure of from about 1 to about 1000 kPa above atmospheric pressure is maintained in the vessel. A pressure differential initially forms and is then allowed to equilibrate over a period of time, in which time air flows from areas of high pressure to areas of low pressure in the organic material thus ensuring that aeration is evenly distributed throughout the organic material.

Abstract: A method and apparatus for the treatment of contaminated gas which comprises placing a biofilter material (28) into a vessel (10) which is arranged to be sealed. A compressor (14) and valve (16) are provided for feeding pressurised contaminated gas into the vessel (10). A valve (20) is provided for releasing treated gas from the vessel (10). The use of pressurised contaminated gas increases the pressure in the vessel (10) which ensures a substantially even distribution of gas in the vessel (10) and the biofilter material (28). The treatment reduces the level of contaminants in the gas.

Abstract: A method and an apparatus is provided for aeration of organic material, wherein the organic material undergoes an aerobic composting process, such that air is caused to evenly penetrate the organic material. The organic material is first sealed in a vessel. Air is then delivered to the contents of the vessel such that an air pressure of from about 1 to about 1000 kPa above atmospheric pressure is maintained in the vessel. A pressure differential initially forms and is then allowed to equilibrate over a period of time, in which time air flows from areas of high pressure to areas of low pressure in the organic material thus ensuring that aeration is evenly distributed throughout the organic material.