A solar drying process was implemented for extended dewatering, volume reduction and partial pathogen control of sewage sludge. The average sludge moisture content decreased from 85% to 6% within 7-12 d during summer, and to 10% within 9-33 days in autumn, resulting to a total volume reduction of 80-85%. Total and fecal coliforms were reduced during summer conditions by two orders of magnitude, resulting to a dry product with 2.10(4) CFU/g DS and 10(3) CFU/g DS, respectively. Incorporating a solar water heater, with water recirculation through the bottom of the plant, the drying process was accelerated by 1-9 d during winter conditions. Solar sludge drying was proved to be efficient for regions which receive high annual solar radiation such as Greece.