Method for composting sludge

A method for composting sludge, comprising:

• mixing sludge with a composting agent and, after thoroughly mixing the combination, depositing the mixture in a first enclosed area in even layers, said thoroughly mixed combination of said sludge and said composting agent being adjusted so that said mixture has a 30 to 1 carbon-nitrogen ratio, blowing air through the mass from the bottom to the top, periodically removing layers from the bottom of the enclosed area at a rate so that the passage time of the mixture from the top down to the bottom where it is removed is a period of 14 days, said depositing of even layers each being for a controlled depth of each said layer and for a controlled time period for depositing each said layer so as to provide for the controlled movement from said top down to said bottom in said 14 days, thereafter, redepositing the removed mixture into a second enclosed area in even layers, blowing air through the second mass from the bottom to the top, periodically removing layers from the bottom of said second enclosed area at a rate so the passage time of the mixture from the top down to the bottom where it is removed as a layer is a second period of 14 days, said depositing of even layers each being for a controlled depth of each said layer and for a controlled time period for depositing each said layer so as to provide for the controlled movement from said top down to said bottom in said 14 days, said periodically removing of layers from the bottom of both said first and said second enclosed areas being coordinated with the depositing of the next succeeding layer at the top, during said passage downwardly of said mixture in both said first and said second enclosed areas controlling the temperatures of said mixture at a plurality of zones in a plurality of temperature ranges, during the processing monitoring the carbon dioxide content of gases and monitoring the moisture content of various aspects of the process, passage through said first enclosed area composting the material and passage through said second enclosed area eliminating any odors therein.