| 摘要 |
PURPOSE:To lower the concns. of Na<+>, Cl<-> and SO3<--> leaked in treated water, by connecting the resin withdrawing port provided to the intermediate part of a cation exchange regeneration tower to the upper part of an anion exchange resin regeneration tower by resin transfer piping. CONSTITUTION:An ion exchange resin mixture is backwashed along with a resin after a desalting process and allowed to stand to be separated into two layers. The resin above the resin withdrawing port 11 provided to the intermediate part of a cation exchange resin regeneration tower 1 is transferred to an anion exchange resin regeneration tower 2 by a resin transfer pipe 101. After transfer, the resins in both regeneration towers are backwashed and allowed to stand. Succeedingly, hydrochloric acid is flowed into the cation exchange resin regeneration tower 1 through piping 103 and sulfuric acid is simultaneously flowed into the anion exchange resin regeneration tower 2 through piping 103. Then, a caustic soda solution is flowed into the anion exchange resin regeneration tower 2 through piping 203 before washing. Subsequently, the resin is transferred to a storage tank 3 from resin transfer piping 102. |
