Development of condensate and waste liquid treatment system for power generation plants using hollow thread film filter

The authors have developed the waste liquid treatment system of 100 m3/h using hollow thread films for BWR power plants. Further by improving and developing this, the condensate-purifying system with large capacity of 1500 m3/h has been put to practical use. At present, these systems are operated in ten power plants, and contribute to the improvement of quality of the water held in the plants, the reduction of labor in operation, the decrease of waste quantity and so on, so those have obtained high appraisal from users. The selection of the polyethylene hollow thread films made by Mitsubishi Rayon Co., Ltd., the development of the hollow thread films for atomic energy, the development of hollow thread film modules and the development of reverse washing method are reported. The waste liquid treatment systems using U-type modules of 10 - 85 m3/h treatment capacity have been used in ten power plants. The condensate-purifying system of arranging two towers of the filters of 750 m3/h treatment capacity in which three stages of I-type modules are connected in parallel was adopted. Those of 750 - 1500 m3/h are used in seven plants. (K.I.)