Abstract: A sludge treatment upgrading project was built on the original sludge treatment facilities in Shidongkou， one of the three wastewater treatment districts in central city of Shanghai. Shidonkou sludge treatment upgrading project takes drying and incineration technology to deal with the sludge from local wastewater treatment plant（WWTP）.The flue gas processed by cyclone dust separating + semi-dry spraying+ activated carbon injection and absorption+ filter dedusting+ wet de-acidification +flue gas reheating techniques can meet the requirement of national standards and the newest local standards of Shanghai. The practical data show that the flue gas procedure is feasible and effective.And with fluid-bed-incinerators， it is competent in municipal sludge incineration and flue gas treatment.Although the current emission standards for flue gas implemented by this project is advanced in China，and some have even reached the EU level， upper limits of a few pollutant are still far higher than that required by the ultra-low emission in power industry， which means that further upgrading for the flue gas treatment system is promising.

Key words: sludge drying and incineration, flue gas treatment, up-to-standard emission, ultra-low emission, system upgrading