CN105903499A - System and method for recycling acid-alkali regeneration wastewater from ion exchange tower - Google Patents
System and method for recycling acid-alkali regeneration wastewater from ion exchange tower Download PDFInfo
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- CN105903499A CN105903499A CN201610367769.6A CN201610367769A CN105903499A CN 105903499 A CN105903499 A CN 105903499A CN 201610367769 A CN201610367769 A CN 201610367769A CN 105903499 A CN105903499 A CN 105903499A
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Abstract
The invention provides a system for recycling acid-alkali regeneration wastewater from an ion exchange tower. The ion exchange tower is connected to a recovered salt water storage tank and a waste salt water storage tank. A recovered salt water pump is arranged on a liquid outlet pipe of the recovered salt water storage tank. A waste salt water storage tank is arranged on a liquid outlet pipe of a waste salt water storage tank. A communicating pipe is arranged between the recovered salt water pump and the waste salt water pump, and a return pipe connected to the waste salt water storage tank is arranged on the communicating pipe. The invention also provides a method for recycling acid-alkali regeneration wastewater from an ion exchange tower. The waste water recycling system provided by the present invention is capable of achieving recycling of regeneration waste water in the waste salt water storage tank by utilizing the existing pipe from the recovered salt water storage tank to a primary salt water storage tank. A pH value measuring device is arranged on the return pipe to guarantee that a pH value at the outlet of the waste salt water pump is greater than 7, thereby avoiding influence on normal production in a salt dissolving procedure. The method provided by the invention has the advantages of reducing sewage discharge, saving water supplementation amount for salt dissolving production water of the primary salt water storage tank, and lowering the production cost.
Description
Technical field
The invention belongs to ion exchange technique field, be specifically related to a kind of ion exchange tower waste water and return
Apparatus and method.
Background technology
Ion exchange membrane alkaline, is the anode with cation exchange membrane isolation electrolytic brine and the moon
Pole, electrolytically generated Caustic soda and chlorine and hydrogen.Ionic membrane method is high to the requirement of saline purity, salt
Water will be through secondary refining, Ca in the saline of entrance electrolysis bath2+、Mg2+Content will be at 20ppb
Hereinafter, spent ion exchange resin is therefore wanted to process to remove calcium, magnesium ion: first by saline
Ca2++Mg2+It is down to below 10ppm, then carries out ion-exchange treatment with chelating resin.
At present, the commonly used ion exchange tower of ionic membrane alkaline industry removes the Ca in demineralized water2+、
Mg2+Deng metal cation, often run certain time, chelating resin in tower need to be regenerated,
Recover its resin activity, to realize recycling.Different ions exchange column resin content, friendship
Changing capacity different, therefore also there is some difference for cycle of operation.The operation of ion exchange tower
Cost is mainly determined by cycle of operation, and cycle of operation is the longest, and regeneration times is the fewest, regenerative process
Middle pure water, compressed air, hydrochloric acid, caustic soda consumption are the fewest, and quantity of wastewater effluent is the fewest, produces into
This is the lowest.
Ion exchange tower water inlet Ca2++Mg2+Content 10ppm, water outlet Ca2++Mg2+Content
20ppb, with Ca2+Content 10ppm adjusts, then primary brine need to increase refining agent Na2CO3
Consumption 2.9 × 10-4T/t (rolls over hundred alkali), just can ensure that system index is qualified.This also result in
The rising of cost.
Summary of the invention
The deficiency existed for this area, the problem to be solved in the present invention is to provide a kind of ion and hands over
Change tower acid alkali regenerative wastewater reclaiming system.
Second object of the present invention is to provide a kind of ion exchange tower acid-alkali regeneration waste water recycling
Method.
The technical scheme realizing above-mentioned purpose of the present invention is:
A kind of ion exchange tower acid-alkali regeneration waste water reuse system, described ion exchange tower connects to be had
Recovered brine storage tank and effluent brine storage tank,
Recovered brine pump, described effluent brine it is provided with on the drain pipe road of described recovered brine storage tank
It is provided with abraum salt water pump on the drain pipe road of storage tank, sets between recovered brine pump and abraum salt water pump
It is equipped with connecting pipe, connecting pipe is provided with the reflux pipe connecting described effluent brine storage tank.
Wherein, the drain pipe road of described recovered brine storage tank is connected to primary brine storage tank, described
The drain pipe road of effluent brine storage tank is connected to sewage disposal system.
Further, described reflux pipe is provided with pH measurement apparatus.
Wherein, described ion exchange tower top is provided with water influent pipeline, and described water influent pipeline connects
There are hydrochloric acid pipeline, Caustic soda pipeline and pure water pipeline, compressed air piping；Described ion exchange tower
Top is additionally provided with drain pipe road, and described drain pipe road connects resin catcher, described resin
Catcher connects described recovered brine storage tank.
Being provided with discharge of wastewater pipeline bottom described ion exchange tower, described discharge of wastewater pipeline is even
Connect described recovered brine storage tank and effluent brine storage tank.
Further, the drain pipe road of described recovered brine storage tank is arranged at the bottom of salt solution reservoir
Portion, the drain pipe road of described effluent brine storage tank is arranged on effluent brine reservoir bottom, described return duct
Road is connected to described effluent brine storage tank top；Wherein, recovered brine storage tank drain pipe road, abraum salt
It is provided with valve on water storage tank drain pipe road, reflux pipe.
A kind of ion exchange tower acid-alkali regeneration waste water recycling method, use present invention proposition is
System, including step:
(1), before the regeneration of separate unit ion exchange tower, fan the air effluent brine storage tank and recovered brine storage tank
Interior regenerative wastewater, starts to regenerate ion exchange tower；First ion exchange tower is carried out once
Washing, blowback, big flow backwash, carry out regeneration of hydrochloric acid, secondary water afterwards to ion exchange tower
Wash, finally ion exchange tower is carried out alkali liquid regeneration, three washings, once washing, big flow
The water outlet of backwash drains into recovered brine storage tank, the washing of regeneration of hydrochloric acid, secondary, alkali liquid regeneration, three
The water outlet of secondary washing drains into effluent brine storage tank；
(2) after secondary washing terminates, open abraum salt water pump, close recovered brine storage tank and connect
Valve on primary brine storage tank pipeline, opens the valve on reflux pipe, effluent brine storage tank
Interior waste water carries out self-loopa mixing；
(3) regenerating ion exchange tower with Caustic soda and water, the waste liquid of discharge enters abraum salt
Water storage tank, when in effluent brine storage tank, pH value reaches more than 7, the valve on closing volume pipeline,
Open the valve that recovered brine storage tank is connected on primary brine storage tank pipeline, to effluent brine storage tank
Liquid level is down to 0, closes abraum salt water pump.
Wherein, in described step (1), ion exchange tower is once washed, hydrochloric acid
Regeneration and secondary are washed, and once discharge opeing, blowback, backwash after washing, in backwash operation, pure
Water is entered by bottom ion exchange tower, top discharge and deliver to resin catcher, drain into back afterwards
Receive salt solution reservoir, then use regeneration of hydrochloric acid.
Wherein, after ion exchange tower is regenerated by step (3) with Caustic soda and water, refined brine is used
Replace described ion exchange tower.
Described refined brine is produced in the following manner: primary brine process uses and adds refining agent
Mode controls Ca in primary brine2++Mg2+≤ 10ppm, then spent ion exchange resin processes
Obtain refined brine；Described refining agent is sodium carbonate, NaOH, FeCl3In one or more.
Wherein, with mass content 25～the hydrochloric acid of 35%, mass content 30～35% Caustic soda to from
Sub-exchange column regenerates, and the volume ratio of hydrochloric acid and Caustic soda is 1:1～1.5.
The beneficial effects of the present invention is:
The waste water reuse system that the present invention proposes, available former recovered brine storage tank is to primary brine
The pipeline of storage tank, it is achieved the reuse of regenerative wastewater in effluent brine storage tank；By on reflux line
PH value measurement apparatus is set, it is ensured that effluent brine pump discharge waste water pH value is more than 7, it is to avoid shadow
Soundization salt operation normally produces.
The method that the present invention proposes, reduces quantity of wastewater effluent, has saved primary brine storage tank
Change brine production water rate of water make-up, reduce production raw originally.
This production unit has ion exchange tower to amount to three, take two series connection, one regeneration
Mode is substituted operation, and separate unit ion exchange tower often runs 80h, need to regenerate 40h, separate unit ion
Exchange column regeneration common property raw acidic and alkaline waste water 175.55m3, about 175.55t, then 3 ion exchanges
Tower produces acid-alkali regeneration waste water 4.39t/h per hour.After effluent brine storage tank regenerative wastewater reuse, often
Hour reducing 4.39t quantity of wastewater effluent, annual charges for disposing pollutants of saving are paid 105360 yuan (year are transported
Row 8000h, 3 yuan/t of charges for disposing pollutants)；Additionally, save 4.39t primary brine storage tank per hour
Produce water rate of water make-up, the water rate expenditure of saving production every year 175600 yuan (year runs 8000h,
Produce 5 yuan/t of water unit price), add up to and reduce production cost 280960 yuan/year.Except economic benefit with
Outward, the reuse of acid-alkali regeneration waste water decreases quantity of wastewater effluent, reduces sewage treatment load,
There is good social benefit and environmental benefit.
Accompanying drawing explanation
Fig. 1 be present system schematic diagram is set.
In figure, 1 is ion exchange tower, and 101 is filtered brine entrance, and 102 is pure water entrance,
103 is hydrochloric acid entrance, and 104 is Caustic soda entrance, and 105 is compressed air line, and 106 put for saline
Change pipeline；2 is resin catcher, and 3 is recovered brine storage tank, and 301 is recovered brine pump, 4
For effluent brine storage tank, 401 is abraum salt water pump, and 402 is the pipeline of decontaminated water processing system, and 5 are
Reflux line, 6 is pH meter, and 7 is the connecting pipe of recovered brine storage tank and effluent brine storage tank, 8
For removing the pipeline of primary brine storage tank.
Detailed description of the invention
Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
In embodiment, if no special instructions, the method used is the method that this area is conventional.
Embodiment 1:
Such as Fig. 1, a kind of ion exchange tower acid-alkali regeneration waste water reuse system, its intermediate ion exchanges
Tower 1 connects recovered brine storage tank 3 and effluent brine storage tank 4,
Recovered brine pump 301, described effluent brine it is provided with on the drain pipe road of recovered brine storage tank 3
It is provided with abraum salt water pump 401, at recovered brine pump 301 and effluent brine on the drain pipe road of storage tank 4
The connecting pipe 7 of recovered brine storage tank and effluent brine storage tank, this communicating pipe it is provided with between pump 401
The reflux pipe 5 being connected to effluent brine storage tank 4 it is provided with on road.Reflux pipe 5 is provided with
PH meter 6.
Wherein, the drain pipe road of recovered brine storage tank 3 is by removing the pipeline 8 of primary brine storage tank
Being connected to primary brine storage tank, decontaminated water processing system is passed through on the drain pipe road of effluent brine storage tank 4
Pipeline 402 be connected to sewage disposal system.
Ion exchange tower 1 top is provided with water influent pipeline, and described water influent pipeline connects filtration salt
Water inlet 101, pure water entrance 102, hydrochloric acid entrance 103, Caustic soda entrance 104, compressed air enters
Mouth 105；Described ion exchange tower 1 top is additionally provided with drain pipe road, and described drain pipe road connects
Resin catcher 2, described resin catcher 2 is had to connect described recovered brine storage tank 3.
Being provided with discharge of wastewater pipeline bottom described ion exchange tower, described discharge of wastewater pipeline leads to
Piping is connected to recovered brine storage tank 3 and effluent brine storage tank 4.
Further, the drain pipe road of recovered brine storage tank 3 is arranged on recovered brine reservoir bottom,
The drain pipe road of effluent brine storage tank 4 is arranged on effluent brine reservoir bottom, and reflux pipe 5 is connected to give up
Salt solution reservoir 4 top；On recovered brine storage tank drain pipe road, effluent brine storage tank drain pipe road,
Valve it is provided with on reflux pipe.
The regeneration of ion exchange tower comprises the following steps:
Use the system of the present embodiment, carry out ion exchange tower acid-alkali regeneration waste water recycling, including
Step:
(1), before the regeneration of separate unit ion exchange tower, fan the air effluent brine storage tank and recovered brine storage tank
Interior regenerative wastewater, starts to regenerate ion exchange tower；First ion exchange tower is carried out a water
Wash, blowback, big flow backwash, afterwards ion exchange tower is carried out regeneration of hydrochloric acid, secondary washing,
Finally ion exchange tower is carried out alkali liquid regeneration, three washings, once washing, big flow backwash
Water outlet drain into recovered brine storage tank, the washing of regeneration of hydrochloric acid, secondary, alkali liquid regeneration, three water
The water outlet washed drains into effluent brine storage tank.
(2) after secondary washing terminates, open abraum salt water pump, close recovered brine storage tank and connect
Valve on primary brine storage tank pipeline, opens the valve on reflux pipe, effluent brine storage tank
Interior waste water carries out self-loopa mixing.
(3) regenerating ion exchange tower with Caustic soda and water, the waste liquid of discharge enters abraum salt
Water storage tank, valve when pH value reaches more than 7 in effluent brine storage tank 4, on closing volume pipeline
Door, opens the valve on the pipeline 8 removing primary brine storage tank that recovered brine storage tank connects, extremely
Effluent brine storage tank 4 liquid level is down to 0, closes abraum salt water pump 401.
(4), after ion exchange tower being regenerated with Caustic soda and water, described ion is replaced with refined brine
Exchange column.Primary brine process uses and adds refining agent sodium carbonate, NaOH, FeCl3Mode
Control Ca in primary brine2++Mg2+≤ 10ppm, more i.e. obtain refined brine through ion-exchange treatment.
In refined brine displacement step, the regenerative wastewater that ion exchange tower top is discharged is arranged through resin catcher
To recovered brine storage tank, (that is, step Isosorbide-5-Nitrae, the water outlet of 11 drains into recovered brine storage tank 3, step 6
Water outlet to 9 drains into effluent brine storage tank 4).
When regeneration is carried out at the end of step 7, and liquid level 2.6m in effluent brine storage tank 4 (accounts for volume
35%), now start abraum salt water pump 401, close and remove the valve of primary brine storage tank pipeline,
Opening the return valve of effluent brine storage tank 4, in effluent brine storage tank 4, waste water self-loopa mixes
Close.When regeneration runs at the end of step 9, and the about 4.8m of the liquid level in effluent brine storage tank 4 (accounts for appearance
Long-pending 64%), hereafter, pay close attention to abraum salt water pump 401 and export pH value, after about 20～30min,
It is stable more than 7 that abraum salt water pump 401 exports pH value, and closing volume pipeline valve opens one
The valve of the pipeline 8 of secondary salt solution reservoir, until effluent brine storage tank 4 liquid level is reduced to 0, stops abraum salt
Water pump 401.
Embodiment 2
This production unit has ion exchange tower to amount to three, take two series connection, one regeneration
Mode is substituted operation, and three ion exchange tower regenerative wastewater of having transformed the most the same manner as in Example 1 are returned
Use system.The step of regeneration is with embodiment 1.
Separate unit ion exchange tower often runs 80h, need to regenerate 40h, and the regeneration of separate unit ion exchange tower is altogether
Produce acidic and alkaline waste water 175.55m3, about 175.55t, then 3 ion exchange towers produce acid per hour
Alkali regenerative wastewater 4.39t/h.After effluent brine storage tank regenerative wastewater reuse, reduce 4.39t per hour
Quantity of wastewater effluent, annual charges for disposing pollutants of saving pay 105360 yuan of (year operation 8000h, blowdowns
Take 3 yuan/t)；Additionally, save the production water rate of water make-up (year of 4.39t primary brine storage tank per hour
Run 8000h, produce 5 yuan/t of water unit price), annual production water rate of saving pays 175600 yuan,
Add up to and reduce production cost 280960 yuan/year.
Above embodiment is only that the preferred implementation to invention is described, not to this
The scope of invention is defined, and on the premise of designing spirit without departing from the present invention, this area is general
Lead to various modification and improvement that technical scheme is made by engineers and technicians, all should fall
Enter in the protection domain that claims of the present invention determines.
Claims (10)
1. an ion exchange tower acid-alkali regeneration waste water reuse system, described ion exchange tower is even
It is connected to recovered brine storage tank and effluent brine storage tank, it is characterised in that
Recovered brine pump, described effluent brine it is provided with on the drain pipe road of described recovered brine storage tank
It is provided with abraum salt water pump on the drain pipe road of storage tank, sets between recovered brine pump and abraum salt water pump
It is equipped with connecting pipe, connecting pipe is provided with the reflux pipe connecting described effluent brine storage tank.
Ion exchange tower acid-alkali regeneration waste water reuse system the most according to claim 1, its
Being characterised by, the drain pipe road of described recovered brine storage tank is connected to primary brine storage tank, described
The drain pipe road of effluent brine storage tank is connected to sewage disposal system.
Ion exchange tower acid-alkali regeneration waste water reuse system the most according to claim 1, its
It is characterised by, described reflux pipe is provided with pH measurement apparatus.
Ion exchange tower acid-alkali regeneration waste water reuse system the most according to claim 1, its
Being characterised by, described ion exchange tower top is provided with water influent pipeline, and described water influent pipeline connects
There are hydrochloric acid pipeline, Caustic soda pipeline and pure water pipeline and compressed air piping；Described ion exchange tower
Top is additionally provided with drain pipe road, and described drain pipe road connects resin catcher, described resin
Catcher connects described recovered brine storage tank；
Being provided with discharge of wastewater pipeline bottom described ion exchange tower, described discharge of wastewater pipeline is even
Connect described recovered brine storage tank and effluent brine storage tank.
5. according to Claims 1 to 4 arbitrary described ion exchange tower acid-alkali regeneration waste water recycling system
System, it is characterised in that the drain pipe road of described recovered brine storage tank is arranged on bottom salt solution reservoir,
The drain pipe road of described effluent brine storage tank is arranged on effluent brine reservoir bottom, and described reflux pipe is even
It is connected to described effluent brine storage tank top；Wherein, recovered brine storage tank drain pipe road, effluent brine storage
It is provided with valve on groove drain pipe road, reflux pipe.
6. an ion exchange tower acid-alkali regeneration waste water recycling method, uses Claims 1 to 5
Arbitrary described system, it is characterised in that include step:
(1), before the regeneration of separate unit ion exchange tower, fan the air effluent brine storage tank and recovered brine storage tank
Interior regenerative wastewater, starts to regenerate ion exchange tower；First ion exchange tower is carried out once
Washing, blowback, big flow backwash, carry out regeneration of hydrochloric acid, secondary water afterwards to ion exchange tower
Wash, finally ion exchange tower is carried out alkali liquid regeneration, three washings, once washing, big flow
The water outlet of backwash drains into recovered brine storage tank, the washing of regeneration of hydrochloric acid, secondary, alkali liquid regeneration, three
The water outlet of secondary washing drains into effluent brine storage tank；
(2) after secondary washing terminates, open abraum salt water pump, close recovered brine storage tank and connect
Valve on primary brine storage tank pipeline, opens the valve on reflux pipe, effluent brine storage tank
Interior waste water carries out self-loopa mixing；
(3) regenerating ion exchange tower with Caustic soda and water, the waste liquid of discharge enters abraum salt
Water storage tank, when in effluent brine storage tank, pH value reaches more than 7, the valve on closing volume pipeline,
Open the valve that recovered brine storage tank is connected on primary brine storage tank pipeline, to effluent brine storage tank
Liquid level is down to 0, closes abraum salt water pump.
Ion exchange tower acid-alkali regeneration waste water recycling method the most according to claim 6, its
It is characterised by, in described step (1), ion exchange tower is once washed, hydrochloric acid
Regeneration and secondary are washed, and once discharge opeing, blowback, backwash after washing, in backwash operation, pure
Water is entered by bottom ion exchange tower, top discharge and deliver to resin catcher, drain into back afterwards
Receive salt solution reservoir, then use regeneration of hydrochloric acid.
Ion exchange tower acid-alkali regeneration waste water recycling method the most according to claim 6, its
It is characterised by, after ion exchange tower is regenerated with Caustic soda and water by step (3), uses refined brine
Replace described ion exchange tower.
Ion exchange tower acid-alkali regeneration waste water recycling method the most according to claim 8, its
Being characterised by, described refined brine is produced in the following manner: primary brine process uses and adds essence
The mode of preparation controls Ca in primary brine2++Mg2+≤ 10ppm, then uses amberlite
Fat processes and obtains refined brine；Described refining agent is sodium carbonate, NaOH, FeCl3In one or
Multiple.
10. according to the arbitrary described ion exchange tower acid-alkali regeneration waste water recycling of claim 6～9
Method, it is characterised in that by mass content 25～the hydrochloric acid of 35%, mass content 30～35%
Ion exchange tower is regenerated by Caustic soda, and the volume ratio of hydrochloric acid and Caustic soda is 1:1～1.5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610367769.6A CN105903499B (en) | 2016-05-27 | 2016-05-27 | Ion exchange tower acid-alkali regeneration waste water reuse system and reuse method |
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| CN201610367769.6A CN105903499B (en) | 2016-05-27 | 2016-05-27 | Ion exchange tower acid-alkali regeneration waste water reuse system and reuse method |
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| CN105903499B CN105903499B (en) | 2018-04-13 |
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Cited By (3)
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| CN107628674A (en) * | 2017-10-31 | 2018-01-26 | 南通江山农药化工股份有限公司 | The categorised collection of resin tower regenerated liquid utilizes technique |
| CN110436570A (en) * | 2019-09-08 | 2019-11-12 | 东营华泰化工集团有限公司 | Refined brine chelating resin regenerative wastewater recyclable device and its use technique |
| CN111003779A (en) * | 2019-11-18 | 2020-04-14 | 浙江浙能技术研究院有限公司 | Fine treatment regeneration system and wastewater classified collection method |
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| CN105903499B (en) | 2018-04-13 |
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