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Method for regenerating ion exchange resin of reverse osmosis rear secondary mixed bed

A technology of ion exchange resin and reverse osmosis, applied in the direction of ion exchange regeneration, ion exchange, ion exchange bed cleaning/flushing, etc., can solve the problems such as difficult to remove, achieve the effect of reducing resin consumption, simple operation, and improving effluent water quality

Active Publication Date: 2011-08-03
中铝中州铝业有限公司
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Problems solved by technology

It is difficult to remove by ion exchange

Method used

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  • Method for regenerating ion exchange resin of reverse osmosis rear secondary mixed bed
  • Method for regenerating ion exchange resin of reverse osmosis rear secondary mixed bed

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Embodiment Construction

[0025] A regeneration method for secondary mixed bed ion exchange resin after reverse osmosis, the secondary mixed bed effluent SiO 2 After the index exceeds the standard (resin SiO 2 deposition poisoning), according to the following methods:

[0026] (1) The first step: after the second-stage mixed bed is out of operation, first use 0.5% low-concentration NaOH solution to pass through the mixed bed resin layer at a flow rate of 4-5m / h, and stop when the lye flows out;

[0027] (2) The second step: 1) Use 5% high-concentration NaOH solution to pass through the mixed bed resin layer at a flow rate of 4-5m / h, close the lower row when the lye flows out, soak the resin for 24 hours, and then drain the regeneration product ;

[0028] 2) Rinse with desalinated water until PH=7;

[0029] (3) The third step: 1) Backwash stratification and release water;

[0030] 2) Wash the anion resin with hot desalted water at 45°C-50°C;

[0031] 3) Perform mixed bed regeneration according to t...

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Abstract

The invention relates to a method for regenerating ion exchange resin of a reverse osmosis rear secondary mixed bed. The method is characterized by comprising the following regenerating steps of: 1) cleaning the ion exchange resin of the secondary mixed bed to be regenerated by using low-concentration alkali liquor so that the resin totally becomes invalid; 2) soaking the totally invalid resin into high-concentration alkali liquor; 3) performing a resin backwashing and demixing process, and cleaning the resin by using heat removal saline; and 4) finally regenerating the mixed bed in a normal regenerating order. The method can effectively solve the common SiO2 deposition positioning problem of the secondary mixed bed in back of a reverse osmosis (RO) water treatment system, and is simple in operation and economic and valid; and the effluent water quality of the mixed bed can reach the standard requirements, the consumption of expensive resin can be reduced, and the effluent water quality can be improved.

Description

technical field [0001] A method for regenerating post-reverse osmosis secondary mixed bed ion exchange resins, relating to a water treatment process, a reverse osmosis RO system post post secondary mixed bed ion exchange resins to remove SiO 2 regeneration method. Background technique [0002] At present, the process of water treatment system used in large-scale alumina plants is usually: groundwater through sand filter + security filter + reverse osmosis + carbon removal + two-stage mixed bed treatment process. After the above process has been in operation for a period of time, there will often be a secondary mixed bed effluent SiO 2 Exceeding the standard phenomenon, and it is difficult to deal with, often affects the quality of boiler feed water. [0003] At present, the silicon removal of the strong base anion resin used in the two-stage mixed bed is an ion exchange reaction to remove silicon, mainly to remove soluble silicon in water. The reaction formula is as follow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J49/00C02F1/44B01J49/50B01J49/60
Inventor 周江红郜生法郎会学王俊芳
Owner 中铝中州铝业有限公司
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