Abstract: In a north waste incineration power plant, the underground water from deep well was treated by MF+RO+EDI integrated membrane method and used as chemical make up water. The design of the system process, the equipments and the operation conditions were introduced, and the problems existing in the system were analyzed. The practice shows that using the MF+RO+EDI technology, the quality of the output water can perfectly accord with the water quality standard of chemical make up water, and the system operates stably and reliably. 

Key words: chemical make up water, micro-filtering (MF), reverse osmosis (RO), electro-deionization (EDI)