| 摘要 |
PROBLEM TO BE SOLVED: To prolong a water-passing period of a NH4 type condensed water desalinization device while blockage for water passing is surely prevented by a method wherein the number of fine particles reaches the specific number of pieces by measuring the number of fine particles in desalinization treated water from a mixed bed column, back washing of the mixed bed column or regeneration of a resin is carried out. SOLUTION: When water passing treatment is carried out by arranging a plurality of mixed bed columns in parallel, the number of fine particles of treated water is measured per each mixed bed column by using a fine particle detection meter for which laser beams, ultrasonic, etc., are utilized. In the case where the number of fine particles per unit volume of the treated water reaches the specific number of particles by this measurement, the water passing is changed to another mixed bed column, and back washing of the mixed bed column or regeneration of the resin is carried out. Thereby, blockage for water passing and deterioration of the treated water are surely prevented, and an operation period of time as a NH4 type condensed water desalinization device can be prolonged to a maximum limit. |
