The hottest thing about mixed ion exchange

2022-10-01
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About mixed ion exchange

mixed bed is the abbreviation of mixed ion exchange column, which is designed for ion exchange technology. The so-called mixed bed means that a certain proportion of cation and anion exchange resins are mixed and filled in the same exchange device to exchange ions in the fluid. Gradually, with the development of science and technology, there are electromechanical driven pressure testing machines and removal. Since the specific gravity of cation resin is larger than that of anion resin, the anion resin is at the top and the cation resin is at the bottom in the mixed bed. Generally, the filling ratio of cation and anion resins is 1:2, and there are also filling ratios of 1:1.5, which can be selected according to different resins. Mixed beds are also divided into internal synchronous regeneration mixed beds and external regeneration mixed beds. During the operation and the whole regeneration process of the synchronous regeneration mixed bed, the resin will not be removed from the equipment during regeneration, and the cation and anion resins will be regenerated at the same time, so less auxiliary equipment is required and the operation is simple

the equipment of mixed bed treatment process includes mixed ion exchanger and in vitro regeneration equipment. The in vitro regeneration equipment mainly includes resin separator, anion (cation) resin regenerator, resin storage tower, hybrid resin tower and acid-base regeneration equipment. The main characteristics of domestic mixed bed treatment process are reflected in the resin separation and regeneration process. There are three separation and regeneration processes of resin

the mixed bed is generally placed behind the electrodialyzer or reverse osmosis device (or directly applied to water with low salt content). Further desalination of water can produce higher purity water, which is widely used in electronics, chemical industry, medicine, atomic energy, electric power and other industries

advantages

1. The effluent quality is excellent, and the pH value of the effluent is close to neutral

2. The outlet water quality is stable, and the change of short-term operating conditions (such as inlet water quality or components, operating flow rate, etc.) has little effect on the outlet water quality of the mixed bed

3. Intermittent operation has little impact on the effluent quality, and the time required to recover to the water quality before shutdown is relatively short

4. The recovery rate reaches 100%

regeneration steps:

Step 1: Operation

there are two water inlet methods: softening (softener treated water) water inlet and primary desalination (reverse osmosis treated water) water inlet, which are controlled by their respective control valves. During operation, the desalting water inlet control valve, water inlet valve, water production valve and other valves should be closed at the beginning

step 2: backwash

close the water inlet valve and water production valve; Open the backwash inlet valve and backwash discharge valve, and backwash for 15min with 1133 construction adhesive 0m/h. Then, close the backwash inlet valve and backwash discharge valve. Stand still and settle for 5-10min. Open the exhaust valve and intermediate discharge valve, partially drain water to about 10cm above the surface of the resin layer, and close the exhaust valve and intermediate discharge valve

step 3: regeneration

open the water inlet valve, acid dosing pump, acid inlet valve and intermediate discharge valve, regenerate the cation resin at 5m/s and 200l/h, and use reverse osmosis water to clean the grease of the anion tree, which is currently under expansion and construction with an annual output of 5000 tons of graphene heavy-duty coating production line, so as to maintain the liquid level in the column at 10cm above the surface of the resin layer. After regenerating the cation resin for 30min, close the water inlet valve, acid dosing pump and acid inlet valve, open the backwashing water inlet valve, alkali dosing pump and alkali inlet valve, regenerate the anion resin at 5m/s and 200l/h, and clean the cation resin with water measured by the dynamometer capacity of the reverse osmosis production Jinan testing machine, maintain the liquid level in the column at 10cm above the surface of the resin layer, and regenerate for 30min

step 4: replacement, grease mixing, flushing

close the alkali dosing pump and alkali inlet valve, open the water inlet valve, and feed water up and down at the same time to replace and clean the resin. After 30min, close the water inlet valve, backwash water inlet valve and intermediate discharge valve, and open the backwash discharge valve, air inlet valve and exhaust valve with the pressure of 0.1-0.15mpa and the gas volume of 2-3m3/(M2) ˙ Min), mixed resin for 0.5-5min. Close the backwashing discharge valve and inlet valve, and settle for 1-2min. Open the water inlet valve, washing discharge valve, adjust the exhaust valve, fill water until there is no air in the column, close the exhaust valve, and flush the resin. When the conductivity meets the requirements, open the water production valve, close the washing discharge valve, and start water production

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