Abstract: Abstract:In a power plant project phase I, the ash sluicing water of ash yard and the circulating water blowdown water were recovered. The two kinds of waste water were mixed and treated by coagulation, clarification and filtration processes. Then, a part of the water is used as ash sluicing water and for mixed purposes in plant area, and the another part of the water treated further by ultra-filtration process and the reverse osmosis integrated membrane deep treatment process, and then was used for water make up of the boiler. The process flow, the matters needing attention in design, the debugging process and the operation of the recycling system were introduced. After the system was put into operation, the quality of the pretreatment and aftertreatment output water was stable and can satisfy the requirement of inlet water quality of the boiler make up water treatment system.

Key words: Keywords:power plant, blowdown water, ash sluicing water, clarification, ultrafiltration, reverse osmosis