CN102603040B - Processing method for electro-adsorption demineralized water - Google Patents
Processing method for electro-adsorption demineralized water Download PDFInfo
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Abstract
The invention discloses a processing method for electro-adsorption demineralized water, which belongs to the water processing with an electrochemical separation method. The processing method for the electro-adsorption demineralized water comprises the following technical processes of energizing working, discharging for standing, carrying out short circuit and regenerating, and has the characteristics that industrial hydrochloric acid is injected into an electro-adsorption module (1) under the condition of continuously feeding water and energizing before the technical process of discharging for standing; water injected with the hydrochloric acid is controlled to just fill in the electro-adsorption module without being discharged out of the system; in addition, the pH (Potential Of Hydrogen) value range of the electro-adsorption module is controlled to 2.0-6.0; while the hydrochloric acid is injected, yielding water normally enters a water production tank (6) and is switched to a middle water discharging tank B (12); and after the electro-adsorption module is full of the hydrochloric acid, water is stop to feed, and the power supply is cut off to enter the technical processes of discharging for standing and regenerating. The invention provides the processing method for the electro-adsorption demineralized water, which has the advantages of simple step and excellent electrode regeneration effect, the electro-adsorption module does not scale, and an electro-adsorption demineralizer is guaranteed to continuously and stably operate for a long term.
Description
Technical field
The present invention is a kind of electro-adsorption demineralization water treatment method.Belong to the processing to water by Electrochemical separation method.
Background technology
Waste water, sewage recycle by processing, not only can save valuable water resources, and can significantly reduce sewage discharge, and the physical environment that to protect mankind is depended on for existence is significant for the mankind's life and economic Sustainable development.Trade effluent generally adopts after secondary biochemical treatment-filtration-charcoal absorption-reverse-osmosis treated, then the flow process of reuse.In prior art, for soft, low-corrosiveness, hyposaline oil refining sewerage, the outer draining after can secondary biochemical treatment is up to standard.After flocculation sediment, filtration and germicidal treatment, direct reuse is done recirculated cooling water moisturizing.But for the higher trade effluent of salts contg, in the time of advanced treatment and reclamation, must remove part or whole inorganic salt almost, could meet the requirement of reuse water.
Electro-adsorption demineralization technology requires the features such as wide, contamination resistance is strong, non-secondary pollution to be widely used because it has to water inlet.Electro-adsorption demineralization is as a kind of water technology, and its core is electro-adsorption module, and electro-adsorption demineralization technique is provided with 2 pack modules, and alternation, regeneration realize and produces continuously water.The technical process of each pack module can be divided into 3 processes, is respectively that energising working process, electric discharge leave standstill process and short circuit regenerative process.Energising working process is the process of electro-adsorption module energising water flowing absorption, namely in module, on electrode, apply galvanic while water flowing, utilize the potential difference between electrode to adsorb gradually the zwitterion in water between electrode of flowing through, start to finishing from work, the ion content producing in water is a process then being raise gradually by the rapid reduction of height, in the time that product water ions content can not meet the demands, end-of-job.Now electrode interior has stored a large amount of energies of position, in order to make full use of this portion of energy, electric discharge is set and leaves standstill process, this process is that electrode positive and negative electrode is connected with the positive and negative electrode of another pack module, recovery part energy, due to potential difference, electric energy can be transferred to rapidly on another pack module, the electromotive force of absorption zwitterion reduces rapidly, and the zwitterion being adsorbed on electrode is understood desorption in the water of electrode channel.After potential difference drops to a certain degree, enter short circuit regenerative process, short circuit regenerative process is by electrode positive and negative electrode short circuit water flowing, now potential difference also can decline rapidly until 0V, water flowing is for electro-adsorption electrode is washed away, departed to desorption in standing short circuit and short circuit regenerative process to the ion in passage, thereby electrode is regenerated.
But electro-adsorption desalination system is in actual motion, electro-adsorption module desalting efficiency can constantly decline, and makes electro-adsorption desalination system be difficult to long-term continuous and steady operation.Therefore the renovation process of exploring electro-adsorption module is those skilled in the art's research direction always.
Patent of invention CN102010039A thinks, it is thoroughly not cause due to the long-term regeneration of module that electro-adsorption module desalting efficiency declines.But the former water water yield used when improving regeneration effect and just must increasing backwash, has so just reduced the producing water ratio of system, has contradiction between the two.Its terms of settlement is: use the electro-adsorption demineralization backwashing system that comprises water unit composition in electro-adsorption module to be regenerated, middle water tank, middle water backwash unit, raw water box, former water backwash unit, recovery, the method for water step backwash in water backwash step, former water backwash step, recovery in employing.Processing step is loaded down with trivial details, electrode regeneration poor effect.
Patent of invention CN102126772A thinks, it is because electrode lengthens duration of service that electro-adsorption module desalting efficiency declines, and surface has produced has that the acidic-group of ion-exchange causes in a large number.This kind of group has the function of similar ion-exchange, that is: electrode slice is placed in to the solution that pH value is lower, the positively charged ion generation permutoid reaction of hydrogen ion energy and the absorption of electrode surface group in solution, hydrogen ion is adsorbed by electrode slice, and the cation concn of bulk solution raises; Again electrode slice is inserted to pH value in neutral salts solution, the hydrogen ion of electrode surface group absorption again can with solution in positively charged ion generation permutoid reaction, positively charged ion is adsorbed by electrode slice group, the pH value reduction of solution.This behavior shows in module routine, that is: when work, because electrode slice is anodal aobvious acid, pH value is lower, and the positively charged ion adsorbing on electrode slice group can be exchanged in original solution by hydrogen ion, and the cation concn of original solution is raise, go out water concentration and raise, affect clearance.And in regenerative process, near electrode slice, solution is neutral, the positively charged ion in solution can be exchanged by the hydrogen ion on electrode slice group, and positively charged ion is come back on electrode slice, affects regeneration effect.Form and the contrary process of electro-adsorption module adsorption-desorption-Adsorption Phase, caused electro-adsorption module adsorption efficiency to decline.Its terms of settlement is the system that uses the electro-adsorption demineralization backwash that comprises electro-adsorption module to be regenerated, sour water case, pickling short circuit regeneration unit, acid discharge unit, water tank, regeneration flushing unit, drainage cell composition, the method for the step of the step of employing pickling regeneration, the step of acid discharge, regeneration flushing, the step backwash of draining.But owing to adding the technique Shortcomings of acid regeneration, electrode regeneration effect is not ideal enough.
The present inventor thinks, in electro-adsorption demineralization water treatment method, the Another reason that electrode adsorption efficiency constantly reduces is that the passage in the electro-adsorption module causing because of the fouling of electro-adsorption module stops up.About the reported in literature that solves this technical problem also there is not yet.
Summary of the invention
The object of the invention is to avoid above-mentioned deficiency of the prior art, and provide, a kind of processing step is simple, to add acid regeneration process reasonable, electrode regeneration effect excellence, electro-adsorption module non flouling behaviour, guarantee the electro-adsorption demineralization water treatment method of the long-term continuous and steady operation of electrical adsorption desalting device.
Object of the present invention can reach by following measure:
Electro-adsorption demineralization water treatment method of the present invention, comprise energising work technological process, electric discharge leaves standstill technological process and short circuit reclaiming process process, it is characterized in that before electric discharge leaves standstill technological process, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module (1), control the water injecting after hydrochloric acid, just be full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 2.0～6.0; With the injection hydrochloric acid while, output water produces water tank (6) by normally entering, and is switched to and enters intermediate water tank B (12); After hydrochloric acid fills electro-adsorption modular system, stop water flowing, cut off the electricity supply, enter electric discharge and leave standstill technological process and short circuit reclaiming process process.
The present inventor thinks, in electro-adsorption demineralization water treatment method, the reason that electrode adsorption efficiency constantly reduces, except electrode regeneration is not exclusively with along with the electrode lengthening of duration of service, surface has produced to be had beyond the acidic-group of ion-exchange in a large number, passage in the electro-adsorption module that the fouling of electro-adsorption module causes stops up, and is another another major reason can not be ignored that electrode adsorption efficiency constantly reduces.
The technique of exactly zwitterion in water being removed from water due to electro-adsorption demineralization technique itself, zwitterion in energising working process water is adsorbed in the electrostatic double layer of positive and negative electrode, leave standstill process in electric discharge, because potential difference reduces rapidly, be adsorbed on zwitterion on positive and negative electrode electrostatic double layer can desorption in the water of electrode channel, because leaving standstill, electric discharge needs the regular hour, zwitterion will meet, now local ionic concn can be very high, when calcium in water, magnesium cation and carbonate, when hydroxide radical anion reaches finite concentration, the factor of fouling will improve greatly, once scale formation occurs, passage in electro-adsorption module will stop up, system pressure raises, desalting efficiency will decline rapidly.
Therefore, before electric discharge leaves standstill technological process, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module, leave standstill in technological process and short circuit reclaiming process process in electric discharge, be attracted to zwitterion desorption on electrode in the water of electrode channel, when the calcium ion of desorption, magnesium ion and carbonate, hydroxide ion meet from electrode, just can not form precipitation fouling, thereby avoid electro-adsorption module to leave standstill in electric discharge the weak point that the fouling in technological process and short circuit reclaiming process process causes.The drawback that electrode adsorption efficiency constantly reduces, the fault of also having avoided the system pressure causing because of the fouling of electro-adsorption module to raise are effectively avoided in electro-adsorption demineralization water treatment method.Guarantee electrical adsorption desalting device continuous and steady operation for a long time.
Object of the present invention can also reach by following measure:
Electro-adsorption demineralization water treatment method of the present invention, is characterized in that comprising the steps:
The a working process of switching on
1. walkthrough step
Working barrel (3) extracts and adsorbs after desalination through electro-adsorption module 1 from the pending water of inlet chest 2, and the initial stage that not yet reaches technical indicator is produced water, enters intermediate water tank B 12;
2. adsorb desalination step
Working barrel (3) extracts and adsorbs after desalination through electro-adsorption module 1 from the pending water of inlet chest 2, reaches the output water of technical indicator, enters and produces water tank 6;
3. arrange afterwards step
When absorption desalination step is when 2. output water quality can not meet technical indicator, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module 1, control the water injecting after hydrochloric acid, be just full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 2.0～6.0; With the injection hydrochloric acid while, output water produces water tank 6 by normally entering, and is switched to and enters intermediate water tank B 12; After hydrochloric acid fills electro-adsorption modular system, stop water flowing, cut off the electricity supply, enter electric discharge and leave standstill technological process.
B electric discharge leaves standstill process
After 3. step completes, stop water flowing, cut off electro-adsorption modular power source, one group of electrode positive and negative electrode is connected with the positive and negative electrode of another pack module, in step 3. in environment, standing electric discharge, recovery part energy;
C short circuit regenerative process
By electrode positive and negative electrode short circuit water flowing, now potential difference also can decline rapidly until 0V, water flowing be for electric discharge is left standstill and short circuit regenerative process in desorption rinse, shift out electro-adsorption modular system to the zwitterion in aquaporin, thereby electrode is regenerated;
1. primary recycling step
Regenerative pump A 8 extracts the water from intermediate water tank A 11, after backwash electro-adsorption module 1, enters dense water tank 7;
2. secondary recycling step
Regenerative pump B 9 extracts the water from inlet chest 2, after backwash electro-adsorption module 1, enters intermediate water tank A 11;
3. tertiary recycling step
Regenerative pump C 10 extracts the water from intermediate water tank A 11, after backwash electro-adsorption module 1, enters inlet chest 2.
Electro-adsorption demineralization water treatment method of the present invention, is characterized in that before electric discharge leaves standstill technological process, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module 1, control the water injecting after hydrochloric acid, be just full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 3.0～5.0; It is preferred technical scheme.
Electro-adsorption demineralization water treatment method of the present invention, it is characterized in that saving walkthrough step in described energising working process a 1., working barrel (3) extracts and adsorbs after desalination through electro-adsorption module 1 from the pending water of inlet chest 2, and output water reaches technical indicator, directly enters and produces water tank 6.
Electro-adsorption demineralization water treatment method of the present invention, it is characterized in that rear row's step in described energising working process a 3., when absorption desalination step is when 2. output water technical indicator approaches a certain set(ting)value exceeding standard, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module, control the water injecting after hydrochloric acid, be just full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 2.0～6.0; With the injection hydrochloric acid while, output water normally enters and produces water tank 6; After hydrochloric acid fills electro-adsorption modular system, stop water flowing, cut off the electricity supply, enter electric discharge and leave standstill technological process.
Electro-adsorption demineralization water treatment method of the present invention, is characterized in that, in described short circuit regenerative process c, adopting a regenerative pump 13, substitutes regenerative pump A 8, regenerative pump B 9 and regenerative pump C 10, and being embodied as the regeneration of electro-adsorption module by time variable control provides power.
Electro-adsorption demineralization water treatment method of the present invention, is characterized in that described intermediate water tank A 11 or intermediate water tank B 12, by saving wherein any one, or increases in addition intermediate water tank, reduces and increase the regeneration times of electro-adsorption module.
The application of electro-adsorption demineralization water treatment method of the present invention, it is characterized in that being applicable to sea water desaltination, brackish water desalination is processed and salts contg is higher trade effluent secondary biochemical treatment up to standard after, during as industrial circulating cooling water reuse, the Demineralized Water Production technological process that need to carry out.
The claimed technical scheme of electro-adsorption demineralization water treatment method of the present invention has following positively effect compared to existing technology.
1. provide that a kind of processing step is simple, to add acid regeneration process reasonable, electrode regeneration effect excellence, electro-adsorption module non flouling behaviour, guarantee the electro-adsorption demineralization water treatment method of the long-term continuous and steady operation of electrical adsorption desalting device.
2. before electric discharge leaves standstill technological process, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module, when the calcium ion of desorption, magnesium ion and carbonate, hydroxide ion meet from electrode, just can not form precipitation fouling, thereby avoid electro-adsorption module to leave standstill the fouling tendency in technological process and short circuit reclaiming process process in electric discharge.
3. the drawback that electrode adsorption efficiency constantly reduces, the fault of also having avoided the system pressure causing because of the fouling of electro-adsorption module to raise have effectively been avoided in electro-adsorption demineralization water treatment method.
4. control the pH value in electro-adsorption module by controlling acid adding amount, make electrode module there is antiscale, scale removal performance, improved the scope of application of electro-adsorption demineralization technique to treatment sewage total hardness and basicity, widened the Application Areas of electro-adsorption demineralization technique.
5. adopt electro-adsorption demineralization water treatment method of the present invention, the producing water ratio of electro-adsorption desalination system reaches more than 75%, and desalination rate reaches more than 80%, ensures the long-term continuous and steady operation of electrical adsorption desalting device.
Brief description of the drawings
The process flow diagram of Fig. 1 embodiments of the invention 1 and embodiment 2
The process flow diagram of Fig. 2 embodiments of the invention 3
The process flow diagram of Fig. 3 embodiments of the invention 4
In figure
1-electro-adsorption module, 2-inlet chest, 3-working barrel, 4-sour water case, 5-acid adding pump, 6-produces water tank, the dense water tank of 7-, 8-regenerative pump A, 9-regenerative pump B, 10-regenerative pump C, 11-intermediate water tank A, 12-intermediate water tank B, 13-regenerative pump.
Embodiment
The present invention will now be further detailed embodiment:
Embodiment 1
A kind of electro-adsorption demineralization water treatment method of the present invention, referring to Fig. 1.
Comprise the steps:
The a working process of switching on
1. walkthrough step
Working barrel (3) extracts and adsorbs after desalination through electro-adsorption module 1 from the pending water of inlet chest 2, and the initial stage that not yet reaches technical indicator is produced water, enters intermediate water tank B 12;
2. adsorb desalination step
Working barrel (3) extracts and adsorbs after desalination through electro-adsorption module 1 from the pending water of inlet chest 2, reaches the output water of technical indicator, enters and produces water tank 6;
3. arrange afterwards step
When absorption desalination step is when 2. output water quality can not meet technical indicator, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module 1, control the water injecting after hydrochloric acid, be just full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 2.0～6.0; With the injection hydrochloric acid while, output water produces water tank 6 by normally entering, and is switched to and enters intermediate water tank B 12; After hydrochloric acid fills electro-adsorption modular system, stop water flowing, cut off the electricity supply, enter electric discharge and leave standstill technological process.
B electric discharge leaves standstill process
After 3. step completes, stop water flowing, cut off electro-adsorption modular power source, one group of electrode positive and negative electrode is connected with the positive and negative electrode of another pack module, in step 3. in environment, standing electric discharge, recovery part energy;
C short circuit regenerative process
By electrode positive and negative electrode short circuit water flowing, now potential difference also can decline rapidly until 0V, water flowing be for electric discharge is left standstill and short circuit regenerative process in desorption rinse, shift out electro-adsorption modular system to the zwitterion in aquaporin, thereby electrode is regenerated;
1. primary recycling step
Regenerative pump A 8 extracts the water from intermediate water tank A 11, after backwash electro-adsorption module 1, enters dense water tank 7;
2. secondary recycling step
Regenerative pump B 9 extracts the water from inlet chest 2, after backwash electro-adsorption module 1, enters intermediate water tank A 11;
3. tertiary recycling step
Regenerative pump C 10 extracts the water from intermediate water tank A 11, after backwash electro-adsorption module 1, enters inlet chest 2.Electro-adsorption module has obtained regeneration.
The producing water ratio of electro-adsorption desalination system reaches more than 75%, and desalination rate reaches more than 80%, ensures the long-term continuous and steady operation of electrical adsorption desalting device.
Embodiment 2
According to the method for embodiment 1 and step, difference is:
1. saved walkthrough step in described energising working process a 1., working barrel (3) extracts and adsorbs after desalination through electro-adsorption module 1 from the pending water of inlet chest (2), and output water reaches technical indicator, directly enters and produces water tank 6.
Rear row's step in energising working process a 3. in, when absorption desalination step is when 2. output water technical indicator approaches a certain set(ting)value exceeding standard, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module, control the water injecting after hydrochloric acid, just be full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 3.0～5.0; With the injection hydrochloric acid while, output water normally enters and produces water tank 6; After hydrochloric acid fills electro-adsorption modular system, stop water flowing, cut off the electricity supply, enter electric discharge and leave standstill technological process.
The producing water ratio of electro-adsorption desalination system reaches more than 75%, and desalination rate reaches more than 80%, ensures the long-term continuous and steady operation of electrical adsorption desalting device.
Embodiment 3
According to the method for embodiment 1 and step, referring to Fig. 2.
Difference is:
Rear row's step in energising working process a 3. in
When absorption desalination step is when 2. output water quality can not meet technical indicator, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module 1, control the water injecting after hydrochloric acid, be just full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 4.5～6.0; With the injection hydrochloric acid while, output water produces water tank 6 by normally entering, and is switched to and enters intermediate water tank B 12; After hydrochloric acid fills electro-adsorption modular system, stop water flowing, cut off the electricity supply, enter electric discharge and leave standstill technological process.
2. described in, in short circuit regenerative process c, adopt a regenerative pump 13, substitute regenerative pump A 8, regenerative pump B 9 and regenerative pump C 10, being embodied as the regeneration of electro-adsorption module by time variable control provides power.
C short circuit regenerative process
1. primary recycling step
By time variable control, regenerative pump 13 extracts the water from intermediate water tank A 11, after backwash electro-adsorption module 1, enters dense water tank 7;
2. secondary recycling step
By time variable control, regenerative pump 13 extracts the water from inlet chest 2, after backwash electro-adsorption module 1, enters intermediate water tank A 11;
3. tertiary recycling step
By time variable control, regenerative pump 13 extracts the water from intermediate water tank A11, after backwash electro-adsorption module 1, enters inlet chest 2.Electro-adsorption module 1 has obtained regeneration.
The producing water ratio of electro-adsorption desalination system reaches more than 75%, and desalination rate reaches more than 80%, ensures the long-term continuous and steady operation of electrical adsorption desalting device.
Embodiment 4
According to the method for embodiment 1 and step, referring to Fig. 3.
Difference is:
1. the rear row's step in energising working process a 3., when absorption desalination step is when 2. output water technical indicator approaches a certain set(ting)value exceeding standard, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module, control the water injecting after hydrochloric acid, just be full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 4.0～5.0; With the injection hydrochloric acid while, output water normally enters and produces water tank 6; After hydrochloric acid fills electro-adsorption modular system, stop water flowing, cut off the electricity supply, enter electric discharge and leave standstill technological process.
2. in short circuit regenerative process c, save intermediate water tank B 12
C short circuit regenerative process
1. primary recycling step
By time variable control, start the water that regenerative pump A 8 extracts from intermediate water tank A 11, after backwash electro-adsorption module 1, enter dense water tank 7;
2. secondary recycling step
By time variable control, start the water that regenerative pump B 9 extracts from inlet chest 2, after backwash electro-adsorption module 1, enter intermediate water tank A1; Electro-adsorption module 1 has obtained regeneration.
The producing water ratio of electro-adsorption desalination system reaches more than 75%, and desalination rate reaches more than 80%, ensures the long-term continuous and steady operation of electrical adsorption desalting device.
Claims (7)
1. an electro-adsorption demineralization water treatment method, comprise energising work technological process, electric discharge leaves standstill technological process and short circuit reclaiming process process, it is characterized in that before electric discharge leaves standstill technological process, in the situation that continuing water flowing, energising, (1) technical hydrochloric acid is injected to electro-adsorption module, control the water injecting after hydrochloric acid, just be full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 2.0～6.0; With the injection hydrochloric acid while, (6) output water produce water tank by normally entering, and is switched to and enters intermediate water tank B (12); After hydrochloric acid fills electro-adsorption modular system, stop water flowing, cut off the electricity supply, enter electric discharge and leave standstill technological process and short circuit reclaiming process process; Comprise the steps:
The a working process of switching on
1. walkthrough step
(3) working barrel extracts from inlet chest pending water (2) and (1) adsorbs after desalination through electro-adsorption module, and the initial stage that not yet reaches technical indicator is produced water, enters intermediate water tank B (12);
2. adsorb desalination step
(3) working barrel extracts from inlet chest pending water (2) and (1) adsorbs after desalination through electro-adsorption module, reaches the output water of technical indicator, enters and produces water tank (6);
3. arrange afterwards step
When absorption desalination step is when 2. output water quality can not meet technical indicator, in the situation that continuing water flowing, energising, (1) technical hydrochloric acid is injected to electro-adsorption module, control the water injecting after hydrochloric acid, be just full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 2.0～6.0; With the injection hydrochloric acid while, (6) output water produce water tank by normally entering, and is switched to and enters intermediate water tank B (12); After hydrochloric acid fills electro-adsorption modular system, stop water flowing, cut off the electricity supply, enter electric discharge and leave standstill technological process;
B electric discharge leaves standstill process
After 3. step completes, stop water flowing, cut off electro-adsorption modular power source, one group of electrode positive and negative electrode is connected with the positive and negative electrode of another pack module, in step 3. in environment, standing electric discharge, recovery part energy;
C short circuit regenerative process
By electrode positive and negative electrode short circuit water flowing, now potential difference also can decline rapidly until 0V, water flowing be for electric discharge is left standstill and short circuit regenerative process in desorption rinse, shift out electro-adsorption modular system to the zwitterion in aquaporin, thereby electrode is regenerated;
1. primary recycling step
(8) regenerative pump A extracts the water (11) from intermediate water tank A, for backwash electro-adsorption module (1) after, enter dense water tank (7);
2. secondary recycling step
(9) regenerative pump B extracts from inlet chest water (2), for backwash electro-adsorption module (1) after, enter intermediate water tank A (11);
3. tertiary recycling step
(10) regenerative pump C extracts the water (11) from intermediate water tank A, backwash electro-adsorption module (1) after, enter inlet chest (2).
2. according to the electro-adsorption demineralization water treatment method of claim 1, it is characterized in that described before electric discharge leaves standstill technological process, in the situation that continuing water flowing, energising, (1) technical hydrochloric acid is injected to electro-adsorption module, control the water injecting after hydrochloric acid, just be full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 3.0～5.0.
3. according to the electro-adsorption demineralization water treatment method of claim 1, it is characterized in that saving walkthrough step in described energising working process a 1., (3) working barrel extracts from inlet chest pending water (2) and (1) adsorbs after desalination through electro-adsorption module, output water reaches technical indicator, directly enters and produces water tank (6).
4. according to the electro-adsorption demineralization water treatment method of claim 2, it is characterized in that rear row's step in described energising working process a 3., when absorption desalination step is when 2. output water technical indicator approaches a certain set(ting)value exceeding standard, in the situation that continuing water flowing, energising, technical hydrochloric acid is injected to electro-adsorption module, control the water injecting after hydrochloric acid, be just full of electro-adsorption modular system, and till not being exhausted from system; And by the pH value scope control of electro-adsorption modular system between 2.0～6.0; With the injection hydrochloric acid while, output water normally enters and produces water tank (6); After hydrochloric acid fills electro-adsorption modular system, stop water flowing, cut off the electricity supply, enter electric discharge and leave standstill technological process.
5. according to the electro-adsorption demineralization water treatment method of claim 2, it is characterized in that in described short circuit regenerative process c, adopt a regenerative pump (13), substitute regenerative pump A (8), regenerative pump B (9) with regenerative pump C (10), being embodied as electro-adsorption module regeneration by time variable control provides power.
6. according to the electro-adsorption demineralization water treatment method of claim 2, it is characterized in that described intermediate water tank A (11) or intermediate water tank B (12), by saving wherein any one, or increase in addition intermediate water tank, reduce and increase the regeneration times of electro-adsorption module.
7. the application of the electro-adsorption demineralization water treatment method of claim 1, it is characterized in that being applicable to sea water desaltination, brackish water desalination is processed and salts contg is higher trade effluent secondary biochemical treatment up to standard after, during as industrial circulating cooling water reuse, the Demineralized Water Production technological process that need to carry out.
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| CN105084471B (en) * | 2014-05-23 | 2019-07-30 | 佛山市顺德区美的饮水机制造有限公司 | Water purification system and process for purifying water |
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