Patent ID: 7694432

Claim:
A method for dehumidification and sanitation of sewage sludge in a chamber, the method comprising: receiving the sewage sludge on a conveyor made of net that is located inside the chamber; emitting thermal radiation from at least one element in the chamber, wherein the at least one element is positioned between an upper part and a lower part of the conveyor, the thermal radiation is concentrated to one or more distinct wavelength ranges at which water has peaks for absorption of radiation energy, and the wavelengths of the thermal radiation are shorter than the openings of the surface structure of the sewage sludge; circulating air in the chamber using a fan to take up moisture evaporated from the sewage sludge; recovering energy from the moisture using a condenser; and maintaining the sewage sludge at a constant temperature within the range of 70-120° C. during the dehumidification cycle.