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Mixed ion exchanger
A mixed bed refers to a system in which water sequentially passes through a cation bed containing hydrogen type cation exchange resin and a anion bed
Product details
Product Introduction:
A mixed bed refers to a system in which water sequentially passes through a cation bed containing hydrogen type cation exchange resin and a anion bed containing hydrogen oxygen type anion exchange resin.
Equipment advantages
1. The effluent quality 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 inlet water quality or composition, operating flow rate, etc.) have little impact on the effluent quality of the mixed bed.
3. Intermittent operation has little impact on the effluent quality, and the time required to restore the water quality to before shutdown is relatively short.
4. Recovery rate reaches 100%
Application scope
Widely used in industries such as electronics, chemical, pharmaceutical, atomic energy, and power.
Working principle
Run
There are two ways of water inlet in this system: softening (water treated by softener) inlet and initial desalination (water treated by reverse osmosis) inlet, which are controlled by their respective control valves.
When operating a mixed bed, the desalination inlet control valve, inlet valve, and production valve should be closed at the beginning, and all other valves should be closed!
Backwashing
Close the inlet valve and production valve; Open the backwash inlet valve and backwash discharge valve, and backwash at 10m/h for 15 minutes. Then, close the backwash inlet valve and backwash discharge valve. Let it settle for 5-10 minutes. Open the exhaust valve and middle exhaust valve, partially drain water to about 10cm above the surface of the resin layer, and close the exhaust valve and middle exhaust valve.
Regeneration
Open the inlet valve, acid pump, acid inlet valve, and intermediate discharge valve to regenerate the cation resin at 5m/s and 200L/h. Clean the anion resin with reverse osmosis water to maintain the liquid level in the column 10cm above the surface of the resin layer. After regenerating the cation resin for 30 minutes, close the inlet valve, acid pump, and acid inlet valve, open the backwash inlet valve, alkali pump, and alkali inlet valve to regenerate the anion resin at 5m/s and 200L/h. Clean the cation resin with reverse osmosis water to maintain the liquid level in the column 10cm above the surface of the resin layer and regenerate for 30 minutes.
Replacement, mixing, and rinsing
Turn off the alkali pump and alkali inlet valve, open the inlet valve, and simultaneously introduce water up and down to replace and clean the resin. After 30 minutes, close the inlet valve, backwash inlet valve, and intermediate exhaust valve, open the backwash discharge valve, inlet valve, and exhaust valve, and mix the resin for 0.5-5 minutes at a pressure of 0.1-0.15 MPa and an air volume of 2-3m3/(m2 · min). Close the backwash discharge valve and intake valve, and let it settle for 1-2 minutes. Open the inlet valve and the positive wash discharge valve, adjust the exhaust valve, fill the column with water until there is no air, then close the exhaust valve and flush the resin. When the conductivity meets the requirements, open the water production valve, close the positive wash discharge valve, and start water production.
Ion exchange process:
Positive resin reaction R-H++Na+→ R-Na++H+
Negative resin reaction R-OH -+Cl - → R-Cl -+OH-
Resin regeneration process:
Resin reaction R-Na++H+→ R-H++Na+
Negative resin reaction R-Cl -+OH - → R-OH -+Cl-
A mixed bed refers to a system in which water sequentially passes through a cation bed containing hydrogen type cation exchange resin and a anion bed containing hydrogen oxygen type anion exchange resin.
Equipment advantages
1. The effluent quality 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 inlet water quality or composition, operating flow rate, etc.) have little impact on the effluent quality of the mixed bed.
3. Intermittent operation has little impact on the effluent quality, and the time required to restore the water quality to before shutdown is relatively short.
4. Recovery rate reaches 100%
Application scope
Widely used in industries such as electronics, chemical, pharmaceutical, atomic energy, and power.
Working principle
Run
There are two ways of water inlet in this system: softening (water treated by softener) inlet and initial desalination (water treated by reverse osmosis) inlet, which are controlled by their respective control valves.
When operating a mixed bed, the desalination inlet control valve, inlet valve, and production valve should be closed at the beginning, and all other valves should be closed!
Backwashing
Close the inlet valve and production valve; Open the backwash inlet valve and backwash discharge valve, and backwash at 10m/h for 15 minutes. Then, close the backwash inlet valve and backwash discharge valve. Let it settle for 5-10 minutes. Open the exhaust valve and middle exhaust valve, partially drain water to about 10cm above the surface of the resin layer, and close the exhaust valve and middle exhaust valve.
Regeneration
Open the inlet valve, acid pump, acid inlet valve, and intermediate discharge valve to regenerate the cation resin at 5m/s and 200L/h. Clean the anion resin with reverse osmosis water to maintain the liquid level in the column 10cm above the surface of the resin layer. After regenerating the cation resin for 30 minutes, close the inlet valve, acid pump, and acid inlet valve, open the backwash inlet valve, alkali pump, and alkali inlet valve to regenerate the anion resin at 5m/s and 200L/h. Clean the cation resin with reverse osmosis water to maintain the liquid level in the column 10cm above the surface of the resin layer and regenerate for 30 minutes.
Replacement, mixing, and rinsing
Turn off the alkali pump and alkali inlet valve, open the inlet valve, and simultaneously introduce water up and down to replace and clean the resin. After 30 minutes, close the inlet valve, backwash inlet valve, and intermediate exhaust valve, open the backwash discharge valve, inlet valve, and exhaust valve, and mix the resin for 0.5-5 minutes at a pressure of 0.1-0.15 MPa and an air volume of 2-3m3/(m2 · min). Close the backwash discharge valve and intake valve, and let it settle for 1-2 minutes. Open the inlet valve and the positive wash discharge valve, adjust the exhaust valve, fill the column with water until there is no air, then close the exhaust valve and flush the resin. When the conductivity meets the requirements, open the water production valve, close the positive wash discharge valve, and start water production.
Ion exchange process:
Positive resin reaction R-H++Na+→ R-Na++H+
Negative resin reaction R-OH -+Cl - → R-Cl -+OH-
Resin regeneration process:
Resin reaction R-Na++H+→ R-H++Na+
Negative resin reaction R-Cl -+OH - → R-OH -+Cl-
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