CN100494095C - Two-section type inverse penetration water treatment system and its water treatment method - Google Patents
Two-section type inverse penetration water treatment system and its water treatment method Download PDFInfo
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- CN100494095C CN100494095C CNB2005101257485A CN200510125748A CN100494095C CN 100494095 C CN100494095 C CN 100494095C CN B2005101257485 A CNB2005101257485 A CN B2005101257485A CN 200510125748 A CN200510125748 A CN 200510125748A CN 100494095 C CN100494095 C CN 100494095C
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Abstract
This invention provides a dual hyperfiltration process system and a method, in which, the system includes a first section of hyperfiltration processor, an anode exchanger and a second section of hyperfiltration processor connected by pipelines orderly, which can effectively solve the problem of scaling and blockage possibly met in water process.
Description
Technical field
The present invention relates to a kind of two-section type reverse osmosis water treatment system, the especially a kind of two-section type reverse osmosis water treatment system that can remove carbonate composition in the water effectively.
Background technology
In the manufacturing processed of pure water, because the reverse osmosis water treatment system is in the application of the purification of water quality program of removing the water intermediate ion and filtering out impurities, have the economy that is difficult to replace and the advantage of function aspects, so the reverse osmosis water treatment system has become the necessaries of the semicon industry that uses the high purity pure water and pharmaceutical industries etc.One of characteristics on the reverse osmosis water treatment system is used are to utilize a part of discharge water, the impurity in the water after concentrating are after filtration discharged, so that the reverse osmosis water treatment system can keep operation stably under the situation of the obstruction that can not cause because of impurities accumulation.
But in the process of and development concentrated in industry, the insufficient situation of regional water resources is appeared in one's mind gradually.For improving the service efficiency of water in the water treatment system, discharged waste water has become one of prerequisite of keeping the industry sustainable development in the minimizing treating processes.For overcoming the problem that known reverse osmosis water treatment system is discharged too much waste water, reduce necessary discharged waste water, someone proposes a kind of two-section type reverse osmosis water treatment system, and it purifies (polish) discharged waste water by the water quality that improves water that reverse osmosis produces to reduce.Referring to Fig. 1, it is the synoptic diagram of known two-section type reverse osmosis water treatment system.Known two-section type reverse osmosis water treatment system system comprises: a front processor 2, the first water inlet dashpot 4, first section reverse osmosis treater 6, the second water inlet dashpot 8, second section reverse osmosis treater 10, a filtered water storage tanks 12 and vacuum degasser 14.When carrying out water treatment, at first before entering first section reverse osmosis treater 6, pending water adds acid, the pH value of pending water is reduced to below 4.3, so that the carbonic acid composition in the water (for example carbanion or its esters) changes carbonic acid gas fully into, is incrustation scales such as lime carbonate with the ionic bond of alkaline-earth metal such as calcium to avoid carbonic acid composition in the water in the process that reverse osmosis is handled, and then causes the obstruction of reverse osmosis treater.Pending water adds alkali reagent again with more than the pH value to 8.3 of adjusting water, so that the carbonic acid gas in the water changes carbonic acid compositions such as heavy carbonic radical ion or carbanion again into after filtering the removal calcium ion through first section reverse osmosis treater 6.Then, remove aforementioned carbonic acid composition by second section reverse osmosis treater 10 again.The carbonic acid composition that from the water that second section reverse osmosis treater 10 discharged, can have at this moment, higher concentration.To the water of discharging, add acid again, make that the carbonic acid composition changes carbonic acid gas entirely in the water, after vacuum degasser 14 or degassing tower are removed the carbonic acid gas in the water from second section reverse osmosis treater 10.Water after removing carbon dioxide treatment thus can import in the aforementioned first water inlet dashpot 4 again and mix the back recycling with pending water from the water source, to reach the purpose of minimizing waste discharge.
But still exist some problems in the aforementioned known two-section type reverse osmosis water treatment system, for example, cause the interpolation that is difficult for carrying out correct alkali number in the preceding method because carbonate composition is the buffer reagent of acid base equilibrium.When adding too much alkali, remove the water-quality deterioration that can cause the water after two sections reverse osmosis are handled, and related increasing the weight of outside the load that back segment handles, also can cause and chase phenomenon (hunting) when adding acid once again, this causes the waste of sour reagent and alkali reagent.In case when adding acid system and going wrong because of the error of chasing phenomenon or pH and measuring, will make carbonic acid composition and calcium ion in first section reverse osmosis treater 6, combine and form fouling fast to cause the obstruction of first section reverse osmosis treater 6, and then cause the collapse of whole reverse osmosis water treatment system.
On the other hand,, contain a large amount of silicon-dioxide (silica) in the pending water often,, have to carry out twice reverse osmosis and handle in order to alleviate silicon-dioxide to the load that the back segment deionizer causes because silicon is the element of content second on the earth.If the aforementioned incorrect alkali that adds takes place, can cause the pH value of pending water to surpass 11, then this moment, silicon-dioxide can become water-soluble state, can cause its supersaturation and separate out after the reverse osmosis filtering and concentrating, and then cause the obstruction of pipeline.The obstruction that silicon-dioxide causes is for the reverse osmosis water treatment system, and not having suitable reagent can use, and can only be cleaned with hydrofluoric acid, and this injury that operator and environment are caused can't be weighed with money.
In addition, in known two-section type reverse osmosis water treatment system, need at last by using vacuum degasser 14 to remove the carbonic acid gas in the water.It is quite high with the processing cost of removing carbonic acid gas in the water that outgases that yet those skilled in the art all understand the setting of vacuum degasser, but if use the positive-pressure type degassing tower, then easily cause the problem of mushroom and algae reproduction, and the both can occupy very big space, causes to such an extent that the volume of known two-section type reverse osmosis water treatment system can't dwindle.On the other hand, therefore small-sized pure water user must use disposable type deionization resin to come carbonate composition in the treating water because its scale is not enough to be provided with regenerative deionization system.Yet can expend surprising cost like this and produce a large amount of waste resin, also also uneconomical in the use, and can cause problem in the environmental protection.
Summary of the invention
For solving the aforementioned shortcoming that in known two-section type reverse osmosis water treatment system, exists, the purpose of this invention is to provide a kind of two-section type reverse osmosis water treatment system, be difficult for the correct alkali that adds in the known two-section type reverse osmosis water treatment system to solve, and the problem that needs to remove carbonic acid gas by vacuum degasser, with reduce because of excessive adding alkali to pollution that environment was caused, and improve and produce quality to reduce the wastewater discharge of further water purifying treatment, to reach the purpose of water-saving.
According to a kind of two-section type reverse osmosis water treatment system of the present invention, comprise:
One front processor, it is used for water is tentatively filtered, with impurity in the filtering water;
First section reverse osmosis treater;
One anion exchanger, it is used for removing the carbonate composition of water; And
Second section reverse osmosis treater;
Wherein, this front processor, first section reverse osmosis treater, anion exchanger and reverse osmosis treater are to be connected in series in regular turn by a pipeline respectively.
Another object of the present invention provides a kind of two-section type reverse osmosis water treatment method, removes the required cost of carbonic acid composition in the water in the known two-section type reverse osmosis water treatment method to reduce effectively.According to a kind of two-section type reverse osmosis water treatment method of the present invention, its step comprises:
(1) obtains former water from the water source, and remove impurity in the water;
(2) carry out first section reverse osmosis and handle, to remove the alkaline-earth metal ions in the former water;
(3) carry out ion-exchange, to remove the carbonate composition in the former water; And
(4) carry out second section reverse osmosis and handle, with the carbonate composition in the former water of further removal.
After the former water process two-section type reverse osmosis water treatment system of the present invention and disposal methods from the water source, the reverse osmosis water that can obtain to have good water quality.Owing to use anion exchanger removing the carbonate composition (for example, carbanion and heavy carbonic radical ion) in the water in the present invention, so need not to use cost and all higher vacuum degasser of operating cost be set.In addition, because anionite-exchange resin can effectively be removed aforesaid carbonate composition, therefore can improve because of the carbonate composition accumulation problem that is difficult to adjust pH that causes, therefore can avoid effectively handling to load increasing the weight of and owing to chasing the alkali reagent that phenomenon causes and the problems such as waste of sour reagent because of the water-quality deterioration, the back segment that excessively add the reverse osmosis water after treatment that alkali reagent caused.
The present invention will be by being described further with reference to following embodiment, and these embodiments do not limit the content that disclose front of the present invention.Those skilled in the art can carry out some improvement and modify, but still do not break away from category of the present invention.
Description of drawings
Fig. 1 is the synoptic diagram of known two-section type reverse osmosis water treatment system.
Fig. 2 is the synoptic diagram of two-section type reverse osmosis water treatment system of the present invention.
Among the figure
2 front processors
4 first water inlet dashpots
6 first sections reverse osmosis treaters
8 second water inlet dashpots
10 second sections reverse osmosis treaters
12 filtered water storage tankss
14 vacuum degassers
18 water sources
20 pretreating devices
22 first water inlet dashpots
24 first sections reverse osmosis treaters
26 mixing tanks
28 anion exchangers
30 second sections reverse osmosis treaters
32 filtered water storage tankss
34 small-sized anionite-exchange resin
Embodiment
With reference to Fig. 2, it is the synoptic diagram of two-section type reverse osmosis water treatment system of the present invention.The pointed two-section type reverse osmosis water treatment system according to the present invention comprises one in order to water is tentatively filtered the front processor 20 with impurity in the filtering water, first section reverse osmosis treater 24, an anion exchanger 28 and second section reverse osmosis treater 30.Wherein, this front processor, first section reverse osmosis treater, anion exchanger and reverse osmosis treater are connected in series in regular turn by a pipeline respectively.
When using two-section type reverse osmosis water treatment system of the present invention to carry out water treatment, at first will pass through pretreating device 20 from the former water at water source 18, to remove the impurity in the former water, comprise sand grains, coloring matter and odoring substance, but be not limited in this.Can use the pretreating device among the present invention, so long as any known treatment unit that can be applicable to remove impurity in the water all can be applied to comprising sand filtration strainer and activated carbon treatment device at this example that can enumerate, but being not limited in this among the present invention.
Owing to knownly reduce to 4.3 when following when the pH of water value, carbonate composition in the water can be transformed into carbonic acid gas fully, therefore will add sour reagent through the former water after pretreating device 20 is handled at this and adjust its pH value and make it be no more than 4.3, so that the carbonate composition in the water is transformed into carbonic acid gas.Aforesaid carbonate composition comprises carbanion and heavy carbonic radical ion, but is not limited in this.Then, the water of adjusting the pH value is fed in first section reverse osmosis treater 24 handle.For the sour reagent of guaranteeing aforementioned adding can be sneaked in the water equably, and can be convenient to monitor the pH value in the water, even more preferably, at water after pretreating device 20 is handled, be introduced in the first water inlet dashpot 22, sour reagent can be sneaked in the water equably, be convenient to adjust its pH value, again water is introduced in first section reverse osmosis treater 24 afterwards.Aforesaid sour reagent just can be applied among the present invention so long as knownly can be used for adjusting the pH value, and the embodiment that can enumerate comprises hydrochloric acid (HCl), but is not limited in this.
Handle through 24 pairs of water of first section reverse osmosis treater, can be with the alkaline-earth metal ions filtering that is contained in the water, the alkaline-earth metal ions that therefore will contain high density in the waste water of being discharged, and by only containing the alkaline-earth metal ions of lower concentration in the water behind first section reverse osmosis treater 24, it can remove the alkaline-earth metal ions more than 95% in the water.Aforesaid alkaline-earth metal ions comprises calcium ion, but is not limited in this.Because the carbonate composition in the water has been converted to carbonic acid gas, therefore can combine and form precipitation of calcium carbonate, and block first section reverse osmosis treater 24 with the calcium ion in the water.Carbonic acid gas in the water can retain in the water of treated mistake by first section reverse osmosis treater 24.
Afterwards, in by the water behind first section reverse osmosis treater 24, add alkali reagent, the pH of water is risen, make the carbonic acid gas in the water of aforementioned processing be converted to carbonate composition again.Then, the water of adjusting the pH value is fed in the anion exchanger 28 handle.The amount that adds alkali reagent at this moment need not to reach all degree that are converted to carbonate composition soluble in water of the carbonic acid gas that makes in the water, only needs a part and converts carbonate composition to and get final product.When carbonate composition in the water was absorbed by anion exchanger 28, the balance in the water between carbonic acid gas and the carbonate composition promptly can be damaged, and the carbonic acid gas in the water promptly can dissolvedly be converted to carbonate composition so that its balance is maintained again like this.Therefore, can reduce like this and make in the water all required alkali reagent consumptions of carbonate composition that are converted to soluble in water of carbonic acid gas.In addition, can sneak into equably in the water for the alkali reagent of guaranteeing aforementioned adding, more preferably be water after adding alkali reagent, earlier through in the mixing tank 26, alkali reagent can be sneaked in the water equably, is convenient to promptly to adjust the pH value of water.Aforesaid alkali reagent all can be applicable among the present invention so long as knownly can be used for adjusting pH value person, and the example that can enumerate comprises sodium hydroxide (NaOH), but is not limited in this.Aforementioned mixing tank just can be applied among the present invention so long as knownly can be used for making liquid mixed uniformly.Those skilled in the art can recognize that aforesaid mixing tank also can substitute with surge tank or other device that can reach identical function easily by reading this specification sheets.When the water that has carbonate composition passed through resin anion(R.A) interchanger 28, the carbonate composition in the water promptly can be absorbed by resin anion(R.A) interchanger 28 and be removed from water.
At last, water is handled by second section reverse osmosis treater 30 again, with residual carbonate composition in the further removal water, and the water that can obtain to have good water quality, the water of this treated mistake can be stored in earlier in the filtered water storage tanks 32.For avoiding carbon dioxide in air to dissolve in once again in the water, more preferably be filtered water storage tanks 32 filling nitrogen in advance.On the other hand, handle the waste water that the back is discharged via second section reverse osmosis treater 30, owing to only contain a spot of carbonate composition, therefore can through recovery deliver to again in the first water inlet dashpot 22 with handle through pretreating device 20 after former water mix, can reduce the demand of former water.
For carbonate composition in the real-time monitoring water treatment system can not accumulated load above water treatment system, even more preferably locate to be provided with water resistance table (water resistance tester), monitor the accumulation situation of carbonate composition in the water in real time in order to detect resistivity of water at the product mouth of a river of second section reverse osmosis treater 30 (that is water port of the water after treated).When anionite-exchange resin 28 when saturated, carbonate composition in the water promptly can increase, this moment, the water resistance table can give the alarm because of water resistance descends, and can learn like this and need carry out the regeneration of anionite-exchange resin 28 this moment, to guarantee the normal operation of water treatment system of the present invention.When guaranteeing that further water treatment system of the present invention is not in time shut down; the carbonate composition that yet can keep in the water treatment system can suddenly significantly not increase; even more preferably small-sized anionite-exchange resin 34 is set, can in system, cause accumulation further to guarantee carbonate composition at the second section reverse osmosis treater 30 and first 22 of the dashpots of water inlet.
Owing to used anionite-exchange resin in the water treatment method of the present invention, therefore can solve the variable of co 2 removal ratio, make the control of water treatment system situation become comparatively simple, and in case reach stable adjustment result, the situation of water treatment system just will only be subjected to the influence of raw water quality change.This respect typically refers to the variation of water temperature with regard to tap water; For underground water, then can be subjected to the water quality influence of change in wet season and low water season.The change of these factors all is progressive, as long as there is the reading of pH table to do with reference to all being enough to strain.
On the other hand, at aforementioned ion-exchanger when absorbing that carbonate composition reaches capacity in the water, promptly need ion-exchanger is regenerated this moment, discharges with the carbonate composition that will be absorbed, so will contain the carbonate composition of high density in the regeneration draining of ion-exchanger.For solving this discharge of wastewater problem, can further comprise a step among the present invention, being about to this regeneration draining that contains high density carbonic acid composition mixes with the aforementioned high concentration alkali earth metals ionic waste water that contains of being discharged by first section reverse osmosis device, forming sedimentary form so that the carbonate composition in this mixed solution combines with alkaline-earth metal ions (for example separates out, form precipitation of calcium carbonate), can make this waste water mixed solution softening with this, and make its recyclable utilization again.At last, the waste water after will softening in this way again can reduce the demand and the discharged waste water of former water with after the former water from the water source mixes.
Claims (16)
1. two-section type reverse osmosis water treatment system comprises:
One first section reverse osmosis treater, it is in order to remove the alkaline-earth metal ions in the water;
One anion exchanger, it is in order to remove the carbonate composition in the water; And
One second section reverse osmosis treater, it is in order to remaining carbonate composition in the further removal water;
Wherein, this first section reverse osmosis treater, anion exchanger and reverse osmosis treater are connected in series in regular turn by a pipeline respectively.
2. the two-section type reverse osmosis water treatment system described in the claim 1 wherein further is provided with one first water inlet dashpot between front processor and first section reverse osmosis treater.
3. the two-section type reverse osmosis water treatment system described in the claim 1 wherein in first section reverse osmosis treater and the anion exchanger, further is provided with a mixing tank.
4. the two-section type reverse osmosis water treatment system described in the claim 2, wherein the waste outlet of second section reverse osmosis treater is connected via a pipeline and the first water inlet dashpot.
5. the two-section type reverse osmosis water treatment system described in the claim 4 wherein further is provided with a small-sized anion exchanger on the pipeline between the second section reverse osmosis treater and the first water inlet dashpot.
6. the two-section type reverse osmosis water treatment system described in the claim 1, wherein the waste outlet of second section reverse osmosis treater further connects a filtered water storage tanks.
7. the two-section type reverse osmosis water treatment system described in the claim 6 wherein is filled with nitrogen in the filtered water storage tanks.
8. the two-section type reverse osmosis water treatment system described in the claim 4, wherein the product mouth of a river of second section reverse osmosis treater further is provided with a water resistance table.
9. the water treatment method of a two-section type reverse osmosis, its step comprises:
(1) obtains former water from the water source, and remove the impurity in the water;
(2) carry out first section reverse osmosis and handle, to remove the alkaline-earth metal ions in the former water;
(3) carry out ion-exchange, to remove the carbonate composition in the former water; And
(4) carry out second section reverse osmosis and handle, with the carbonate composition in the former water of further removal.
10. the water treatment method described in the claim 9, wherein taking a step forward in step (2) comprises that the pH value of adjusting former water makes it be no more than 4.3.
11. the water treatment method described in the claim 9, wherein taking a step forward in step (3) comprises the pH value of adjusting former water to alkaline range, so that the carbonic acid gas in the former water is converted to the carbonic acid composition.
12. the water treatment method described in the claim 9, wherein this water treatment method further comprises following step:
(a) step (3) the is regenerated regeneration draining that is produced mixes with the filtered wastewater that step (2) is produced;
(b) make the carbonate composition of regeneration in the draining combine, separate out and precipitate with alkaline-earth metal ions in the filtered wastewater; And
(c) removing the draining of will regenerate behind the throw out mixes with former water with the mixed solution recovery of filtered wastewater.
13. the water treatment method described in the claim 9, wherein this water treatment method further comprises the detection resistivity of water, with the accumulation situation of carbonate composition in the real-time monitoring water.
14. the water treatment method described in the claim 9, wherein this alkaline-earth metal ions is a calcium ion.
15. the water treatment method described in the claim 9, wherein this carbonate composition is a carbanion.
16. the water treatment method described in the claim 9, wherein this carbonate composition is the heavy carbonic radical ion.
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| CNB2005101257485A CN100494095C (en) | 2005-12-01 | 2005-12-01 | Two-section type inverse penetration water treatment system and its water treatment method |
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| CNB2005101257485A CN100494095C (en) | 2005-12-01 | 2005-12-01 | Two-section type inverse penetration water treatment system and its water treatment method |
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| CN1978334A CN1978334A (en) | 2007-06-13 |
| CN100494095C true CN100494095C (en) | 2009-06-03 |
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| CN105000632B (en) * | 2015-08-05 | 2018-05-18 | 华北电力科学研究院有限责任公司 | A kind of preparation facilities and method of micro high purity water |
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Granted publication date: 20090603 Termination date: 20121201 |