The paper mainly targets at investigating which municipal sludge drying technology is efficient and economical. Using the drying method of microwave to study on the factors influenced over the drying efficiency of municipal sludge. And do the experiment analysis and comparison about the energy consumption of microwave methods to seek for the more efficient, energy-saving sludge drying technology. The results show that Sludge microwave drying process consists of three stages: acceleration phase,

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... constant speed phase and deceleration phase. During the microwave drying process, when the microwave power is the same, the bigger diameter of the municipal sludge is the faster drying rate exists. The higher the microwave power, the faster drying rate exists. In this research, the unit energy consumption of 480W microwave power is lower than others, and the drying rate in this condition is relatively faster. The research conclusions will provide a scientific basis for municipal sludge drying and semi-drying in engineering practice, which has a certain guiding significance.