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Ion exchange tower acid-base regeneration wastewater recycling system and recycling method

A technology for ion exchange and wastewater regeneration, applied in the field of ion exchange, can solve problems such as rising costs, and achieve the effects of saving water replenishment, reducing production costs, and reducing sewage discharge.

Active Publication Date: 2018-04-13
内蒙古君正化工有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Ion exchange tower acid-base regeneration wastewater recycling system and recycling method
  • Ion exchange tower acid-base regeneration wastewater recycling system and recycling method
  • Ion exchange tower acid-base regeneration wastewater recycling system and recycling method

Examples

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Embodiment 1

[0032] like figure 1 , an ion exchange tower acid-base regeneration wastewater reuse system, wherein the ion exchange tower 1 is connected with a recovery brine storage tank 3 and a waste brine storage tank 4,

[0033] A recovery brine pump 301 is provided on the liquid outlet pipeline of the recovered brine storage tank 3 , a waste brine pump 401 is provided on the outlet pipeline of the waste brine storage tank 4 , and between the recovery brine pump 301 and the waste brine pump 401 The communication pipeline 7 of the recovery brine storage tank and the waste brine storage tank is provided with a return pipeline 5 connected to the waste brine storage tank 4 . A pH meter 6 is provided on the return line 5 .

[0034] The outlet pipeline of the recovered brine storage tank 3 is connected to the primary brine storage tank through the pipeline 8 to the primary brine storage tank, and the outlet pipeline of the waste brine storage tank 4 is connected to the primary brine storage ...

Embodiment 2

[0048] The production unit has a total of three ion exchange towers, two of which are connected in series and one of which is regenerated and run alternately. The three ion exchange towers are all transformed into a regenerated wastewater reuse system as in Example 1. The steps of regeneration are the same as in Example 1.

[0049] Every time a single ion exchange tower runs for 80 hours, it needs to be regenerated for 40 hours. The regeneration of a single ion exchange tower produces a total of 175.55m3 of acid-base wastewater, about 175.55t, and 3 ion-exchange towers generate 4.39t / h of acid-base regeneration wastewater per hour. After reuse of the regenerated wastewater from the waste brine storage tank, the sewage discharge is reduced by 4.39 tons per hour, and the annual sewage discharge cost is saved by 105,360 yuan (the annual operation is 8000h, and the sewage discharge fee is 3 yuan / t); in addition, 4.39 tons of brine storage tank is saved once The production water re...

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Abstract

The invention provides an ion exchange tower acid-base regeneration waste water reuse system. The ion exchange tower is connected with a recovered brine storage tank and a waste brine storage tank. A waste brine pump is provided on the outlet pipeline of the storage tank, a communication pipeline is provided between the recovery brine pump and the waste brine pump, and a return pipeline connected to the waste brine storage tank is provided on the communication pipeline. The invention also proposes a method for reusing the acid-base regeneration wastewater of the ion exchange tower. The wastewater reuse system proposed by the present invention can utilize the pipeline from the original recovered brine storage tank to the primary brine storage tank to realize the reuse of regenerated wastewater in the waste brine storage tank; by setting a pH value measuring device on the return pipeline, it can ensure that the waste salt The pH value of the pump outlet is greater than 7, so as to avoid affecting the normal production of the salt process. The method of the invention reduces the amount of sewage discharge, saves the water replenishment amount of the brine production water in a brine storage tank, and reduces the production cost.

Description

technical field [0001] The invention belongs to the technical field of ion exchange, and in particular relates to a device and method for reusing wastewater from an ion exchange tower. Background technique [0002] Ion exchange membrane alkali production is to separate the anode and cathode of electrolytic brine with cation exchange membrane, and electrolyze to generate caustic soda, chlorine gas and hydrogen gas. The ion membrane method has high requirements on the purity of the brine. The brine has to be refined twice, and the Ca 2+ , Mg 2+ The content should be below 20ppb, so it should be treated with ion exchange resin to remove calcium and magnesium ions: first remove the Ca in the brine 2+ +Mg 2+ down to less than 10 ppm, and then ion-exchange treatment with chelating resin. [0003] At present, the ion-exchange tower is commonly used in the ion-exchange membrane industry to remove Ca in brine. 2+ , Mg 2+ After a certain period of operation, the chelating resin ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J49/60
Inventor 苏新华张敬宇李斌王洪丽张红瑞马龙王果园孔红霞李杨
Owner 内蒙古君正化工有限责任公司