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Recent Developments in Wastewater Sludge Solar Drying Technology |
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Abstract: With the increase of the practice of sewage treatment in China, the annual growth rate of the sludge production reaches 10%~15%. The production of a large amount of sewage sludge creates tremendous pressure and secondary pollution in environment. The high content of organic substance and water, normally over 80%(wet basis), makes the treatment of dewatering sewage sludge rather difficult. Thermal drying of the sludge is an important treatment and process and is an important prerequisite for the stabilization of sludge, the reduction of sludge volumes and the utilization of sludge, but a quite large amount of energy is required for drying sludge. Heatpump assistant solar drying of the sewage sludge may reduce the energy requirement. In this paper, the recent development in the wastewater sludge solar drying technology in China and other countries is reviewed, and it is suggested that the key development in the sludge solar drying technology in the future is the heat storage and heatpump assisted wastewater sludge solar drying technology.
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Received: 28 October 2010
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