Mixed bed - ion exchange column
Mixed bed is the abbreviation of mixed ion exchange column, which is an equipment designed for ion exchange technology.
The so-called mixed bed is to mix and pack a certain proportion of cation and anion exchange resins in the same exchange device to exchange and remove ions in the fluid. Since the specific gravity of the cation resin is larger than that of the anion resin, the anion resin is above the cation resin in the mixed bed. Generally, the ratio of cation and anion resin filling is 1:2, and there are also filling ratios of 1:1.5, which can be selected according to different resins as appropriate.
Mixed beds are also divided into in vivo synchronous regenerative mixed beds and in vitro regenerative mixed beds. The synchronous regeneration mixed bed is in operation and the whole regeneration process is carried out in the mixed bed, the resin is not moved out of the equipment during regeneration, and the cation and anion resins are regenerated at the same time, so less auxiliary equipment is required, the operation is simple, and has the following advantages:
(1) The quality of the effluent is excellent, and the pH value of the effluent is close to neutral.
(2) The effluent quality is stable, and short-term changes in operating conditions (such as influent water quality or composition, operating flow rate, etc.) have little effect on the effluent quality of the mixed bed.
(3) The impact of intermittent operation on the effluent quality is small, and the time required to restore the water quality before the shutdown is relatively short.
(4) The exchange end point is obvious
