CN214115293U - Ion exchange regeneration sewage calcium removal system - Google Patents
Ion exchange regeneration sewage calcium removal system Download PDFInfo
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- CN214115293U CN214115293U CN202023202404.9U CN202023202404U CN214115293U CN 214115293 U CN214115293 U CN 214115293U CN 202023202404 U CN202023202404 U CN 202023202404U CN 214115293 U CN214115293 U CN 214115293U
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Abstract
The utility model discloses an ion exchange regeneration sewage decalcification system, including spent acid buffer pool, drip washing sewage buffer pool, alkali waste buffer pool, sodium hydroxide storage tank, decalcification agent sodium carbonate storage tank, equalizing basin, blender, settling basin, vacuum drum filter, carbon dioxide storage tank, surge tank, divide into calcium-containing spent acid, alkali waste and drip washing sewage with the ion exchange regeneration sewage, can reduce the decalcification load about 85%; the waste alkali is utilized to neutralize the waste acid containing calcium, so that the alkali consumption for adjusting pH before the calcium remover is added can be greatly reduced; the waste alkali and the ion exchange elution sewage are separated, so that the waste alkali is utilized, and the carbon dioxide consumption for neutralizing the pH value before the elution sewage enters the anaerobic tower is reduced; the precipitated calcium is separated from the sewage by vacuum drum filtration, so that the separation effect is improved. The utility model discloses the method removes calcium efficiently, and calcium ion concentration control is within 20ppm in the sewage after removing calcium, has reduced the risk of sewage system pipeline scale deposit and mud caking widely.
Description
Technical Field
The utility model relates to an ion exchange regeneration sewage treatment technical field, concretely relates to ion exchange regeneration sewage removes calcium system.
Background
In the sugar industry, a large amount of hydrated lime is often added into sugar liquor in the pretreatment stage for flocculation and precipitation, although the sugar liquor is precipitated by carbon dioxide, calcium ions in materials before ion exchange are still high (1000 ppm-2000 ppm), the calcium ions are adsorbed by ion exchange resin in the ion exchange process and enter sewage through the ion exchange regeneration process, so that the concentration of the calcium ions in the ion exchange regeneration sewage is often over 1000ppm, if calcium removal treatment is not carried out, a sewage treatment system is easy to scale, and the normal operation of production is influenced because the shutdown and cleaning are often needed.
The existence of a large amount of calcium ions in sewage not only easily causes the scaling of sewage pipelines, but also influences the operation of a water system due to the existence of sludge, and at present, more calcium removal researches are carried out. For example, patent No. CN201410414823.9 discloses a sewage decalcification device for paper industry, through improving the decalcification device, has realized sewage continuous processing, has improved the decalcification efficiency of water system, but this patent is on the high side with the filter sand decalcification cost, and removes calcium inefficiency, only is applicable to the preceding decalcification of the outer row of sewage, and the limitation is great. For example, patent No. CN201610666207.1 discloses a sewage treatment process and apparatus, in which calcium is removed by adding a calcium remover, but a large amount of quicklime is added in the pH adjustment stage, which increases the difficulty of solid-liquid separation in the later stage, and meanwhile, the quicklime has weak alkalinity, which increases the cost for adjusting pH, and in addition, the addition of quicklime in sewage generates a large amount of heat, which easily generates a lot of bad odors in sewage, and is not suitable for sewage treatment in sugar industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an ion exchange regeneration sewage removes calcium system to solve the not enough of prior art.
The utility model adopts the following technical scheme:
an ion exchange regeneration sewage calcium removal system comprises a waste acid buffer tank, a leaching sewage buffer tank, a waste alkali buffer tank, a sodium hydroxide storage tank, a calcium remover sodium carbonate storage tank, a regulating tank, a settling tank, a vacuum drum filter, a carbon dioxide storage tank and a regulating tank;
the waste acid buffer pool is connected with calcium-containing waste acid at the initial stage of the ion-exchange cation column ion-exchange regeneration process,
the waste alkali buffer pool is connected with the waste alkali at the initial stage of the ion exchange anion column ion exchange regeneration process,
the elution sewage buffer pool is connected with elution sewage at the last stage of the ion-exchange cation column and ion-exchange anion column ion-exchange regeneration process;
an outlet of the waste acid buffer tank, an outlet of the waste alkali buffer tank and an outlet of the sodium hydroxide storage tank are respectively connected with the regulating tank, an outlet of the regulating tank and an outlet of the calcium removing agent sodium carbonate storage tank are respectively connected with the sedimentation tank, an outlet of the sedimentation tank is connected with the vacuum drum filter, an outlet of a filtered liquid of the vacuum drum filter, an outlet of the elution sewage buffer tank and an outlet of the carbon dioxide storage tank are respectively connected with the regulating tank, a filtered solid outlet of the vacuum drum filter is connected with precipitated calcium conveying equipment, and an outlet of the regulating tank is connected to the anaerobic tower.
And the outlet of the waste acid buffer pool and the outlet of the waste alkali buffer pool are respectively connected with the mixer, and the outlet of the mixer is connected with the regulating pool.
Further, stirring devices are respectively arranged in the sodium hydroxide storage tank, the calcium removing agent sodium carbonate storage tank, the regulating tank and the regulating tank.
Further, a pH meter is also arranged in the adjusting tank.
The utility model has the advantages that:
1. the ion exchange regeneration sewage is divided into calcium-containing waste acid, waste alkali and leaching sewage which are respectively discharged into corresponding buffer tanks, and the calcium removal load can be reduced by about 85%.
2. The recycled waste alkali is utilized to neutralize the waste acid containing calcium, so that the alkali consumption for adjusting pH before the calcium remover is added can be greatly reduced.
3. The waste alkali and the ion exchange elution sewage are separated, so that the waste alkali is utilized, and the carbon dioxide consumption for neutralizing the pH value before the elution sewage enters the anaerobic tower is reduced.
4. The precipitated calcium is separated from the sewage by vacuum drum filtration, so that the separation effect is improved, and the precipitated calcium is prevented from entering an anaerobic tower to form secondary pollution.
5. The utility model discloses the method removes calcium efficiently, and calcium ion concentration control is within 20ppm in the sewage after removing calcium, has reduced the risk of sewage system pipeline scale deposit and mud caking widely, does benefit to and keeps production continuous.
Drawings
FIG. 1 is a schematic view of the structure principle of the ion exchange regenerative sewage calcium removal system of the present invention;
FIG. 2 is a schematic flow chart of the application method of the ion exchange regeneration sewage calcium removal system of the utility model.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An ion exchange regeneration sewage calcium removal system is shown in figure 1 and comprises a waste acid buffer tank 3, a leaching sewage buffer tank 4, a waste alkali buffer tank 5, a sodium hydroxide storage tank 6, a calcium remover sodium carbonate storage tank 7, an adjusting tank 8, a mixer 9, a settling tank 10, a vacuum drum filter 11, a carbon dioxide storage tank and an adjusting tank 12.
And the waste acid buffer tank 3 comprises a liquid level meter and is used for collecting the calcium-containing waste acid at the initial stage of the ion exchange regeneration process.
And the eluting sewage buffer tank 4 comprises a liquid level meter and is used for recovering eluting sewage at the final stage of the ion exchange regeneration process.
And the waste alkali buffer tank 5 comprises a liquid level meter and is used for recovering waste alkali at the initial stage of the ion exchange regeneration process.
The sodium hydroxide storage tank 6 comprises a liquid level meter and a stirring device 13 and is used for adjusting the pH value when the waste alkali is insufficient.
The calcium remover sodium carbonate storage tank 7 comprises a stirring device 13 and a liquid level meter, is used for storing sodium carbonate solution and is used for precipitating calcium ions in sewage.
And the adjusting tank 8 comprises a liquid level meter, a stirring device 13 and a pH meter and is used for adjusting the pH of the sewage to be subjected to calcium removal.
And the mixer 9 is used for mixing liquid and improving the acid-base mixing effect.
The sedimentation tank 10, which comprises a pH meter and a liquid level meter, is used for reacting calcium-containing sewage with sodium carbonate to convert calcium ions into calcium carbonate precipitates.
And the vacuum drum filter 11 is used for solid-liquid separation after the calcium precipitation.
A carbon dioxide storage tank for adjusting the pH value of the sewage in the adjusting tank 12.
The adjusting tank 12 comprises a pH meter, a liquid level meter, a stirring device 13 and an adjusting valve and is used for adjusting the pH of the sewage before the sewage enters the anaerobic tower;
the waste acid buffer tank 3 is connected with calcium-containing waste acid at the initial stage of the ion exchange regeneration process of the ion exchange positive column 1, the waste alkali buffer tank 5 is connected with waste alkali at the initial stage of the ion exchange regeneration process of the ion exchange negative column 2, and the elution sewage buffer tank 4 is connected with elution sewage at the final stage of the ion exchange regeneration process of the ion exchange positive column 1 and the ion exchange negative column 2.
The outlet of the waste acid buffer tank 3 and the outlet of the waste alkali buffer tank 5 are respectively connected with a mixer 9, and the outlet of the mixer 9 and the outlet of the sodium hydroxide storage tank 6 are respectively connected with an adjusting tank 8. The outlet of the regulating tank 8 and the outlet of the calcium removing agent sodium carbonate storage tank 7 are respectively connected with a sedimentation tank 10, and the outlet of the sedimentation tank 10 is connected with a vacuum rotary drum filter 11. The liquid outlet of the vacuum rotary drum filter 11, the outlet of the eluting sewage buffer tank 4 and the outlet of the carbon dioxide storage tank are respectively connected with a regulating tank 12, the solid outlet of the vacuum rotary drum filter 11 is connected with precipitated calcium conveying equipment, and the outlet of the regulating tank 12 is connected to an anaerobic tower.
A method for using an ion exchange regeneration sewage calcium removal system is shown in figure 2, and comprises the following steps:
(1) calcium-containing waste acid in the initial stage of the ion exchange regeneration process of the ion exchange cation column 1 is discharged into a waste acid buffer tank 3, and elution sewage in the final stage of the regeneration process is discharged into an elution sewage buffer tank 4.
(2) The waste alkali at the initial stage of the ion exchange regeneration process of the ion exchange anion column 2 is discharged into a waste alkali buffer tank 5, and the elution sewage at the final stage of the regeneration process is discharged into an elution sewage buffer tank 4.
(3) Calcium-containing waste acid in the waste acid buffer tank 3 and waste alkali in the waste alkali buffer tank 5 are mixed through a mixer 9 and then enter an adjusting tank 8, the pH of sewage in the adjusting tank 8 is controlled to be 7-8, and fresh alkali is added through a sodium hydroxide storage tank 6 to adjust the pH when the waste alkali is insufficient.
(4) And after the pH value in the adjusting tank 8 meets the requirement, discharging the sewage into a settling tank 10, and simultaneously adding a calcium removing agent sodium carbonate aqueous solution into the settling tank 10 through a calcium removing agent sodium carbonate storage tank 7, wherein the pH value of the sewage in the settling tank 10 is controlled to be 10-11.
(5) After the sewage in the sedimentation tank 10 reacts with the calcium removing agent, starting the vacuum drum filter 11, separating the precipitated calcium precipitate from the sewage, discharging the calcium-removed sewage and the sewage in the rinsing sewage buffer tank 4 into the adjusting tank 12 together, and controlling the final pH to be 9-10 by adding carbon dioxide; the separated calcareous precipitate is treated as solid waste.
(6) And after the pH value of the sewage in the adjusting tank 12 meets the requirement, the sewage enters an anaerobic tower for further treatment.
Example 1
Taking xylose mother liquor as an example, carrying out ion exchange on a material before ion exchange, controlling the calcium ion content to be 20ppm after ion exchange, carrying out 12m flowering by using dilute acid (4 wt% hydrochloric acid) consumed by positive column regeneration, and carrying out 42m flowering by using wastewater produced by one regeneration; and carrying out anion column regeneration for 8m high-yield cultivation and 40m high-yield cultivation on dilute alkali (4 wt% sodium hydroxide) each time, carrying out regeneration for once to produce sewage, and carrying out mixed blowdown until the calcium ion concentration reaches 1000 ppm.
In the first step, when the ion-exchange cation column 1 is regenerated, the first 12m of wastewater (calcium-containing waste acid) is drained into a waste acid buffer tank 3 (the recovery time can be slightly prolonged for thorough recovery), and the rest of leaching wastewater (containing no calcium) is switched to a leaching wastewater buffer tank 4.
And in the second step, when the ion exchange anion column 2 is regenerated, the first 8m of wastewater (waste alkali) is discharged into a waste alkali buffer tank 5 (the recovery time can be slightly prolonged for thorough recovery), and the rest of leaching wastewater is switched to a leaching wastewater buffer tank 4.
And thirdly, when the liquid level of the sewage in the waste acid buffer tank 3 reaches about 60%, mixing the calcium-containing waste acid in the waste acid buffer tank 3 and the waste alkali in the waste alkali buffer tank 5 through a mixer 9, and then feeding the mixture into an adjusting tank 8, controlling the pH of the sewage in the adjusting tank 8 to be 7-8, and adding fresh alkali (4 wt% of sodium hydroxide) through a sodium hydroxide storage tank 6 to adjust the pH when the waste alkali is insufficient.
And fourthly, discharging the sewage into a settling pond 10 after the pH value in the regulating pond 8 meets the requirement, and simultaneously adding a calcium removing agent sodium carbonate aqueous solution (15 wt%) into a calcium removing agent sodium carbonate storage tank 7, wherein the pH value of the sewage in the settling pond 10 is controlled to be 10-11.
Fifthly, after the sewage in the sedimentation tank 10 reacts with the calcium removing agent for 1 hour, starting a vacuum rotary drum filter 11 to separate precipitated calcium from the sewage, discharging the calcium-removed sewage and the sewage in the rinsing sewage buffer tank 4 into an adjusting tank 12, and controlling the final pH to be 9-10 by adding carbon dioxide; the separated precipitated calcium is treated as solid waste.
Sixthly, adjusting the pH value of the sewage in the tank 12 to meet the requirement, and then feeding the sewage into an anaerobic tower for further treatment.
Through the six steps, the calcium removal work before the ion exchange regeneration sewage enters the anaerobic tower is completed, and the main carriers (waste acid) of calcium ions are independently treated by analyzing the generation mechanism of calcium ions, so that the calcium removal sewage quantity required for each ion exchange regeneration is reduced from the root of shihike under 82m to the root of shihike under 12m, and the load of a calcium removal system is greatly reduced. And meanwhile, the regenerated waste alkali of the ion exchange anion column and the calcium-containing waste acid are utilized for neutralization, so that the consumption of new alkali can be reduced by 8 m/time, and the consumption of new alkali by adjusting the pH value is only one third of the original consumption. In addition, the application of the vacuum drum filter 11 improves the separation effect of the precipitated calcium and sewage, and prevents the precipitated calcium from entering an anaerobic tower to form secondary pollution. The calcium ion concentration of the sewage after calcium removal can be controlled within 20ppm, the risks of scaling of pipelines and sludge agglomeration of a sewage system are greatly reduced, and the continuous production is favorably kept.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. An ion exchange regeneration sewage calcium removal system is characterized by comprising a waste acid buffer tank, a leaching sewage buffer tank, a waste alkali buffer tank, a sodium hydroxide storage tank, a calcium remover sodium carbonate storage tank, a regulating tank, a sedimentation tank, a vacuum drum filter, a carbon dioxide storage tank and a regulating tank;
the waste acid buffer pool is connected with calcium-containing waste acid at the initial stage of the ion-exchange cation column ion-exchange regeneration process,
the waste alkali buffer pool is connected with the waste alkali at the initial stage of the ion exchange anion column ion exchange regeneration process,
the elution sewage buffer pool is connected with elution sewage at the last stage of the ion-exchange cation column and ion-exchange anion column ion-exchange regeneration process;
an outlet of the waste acid buffer tank, an outlet of the waste alkali buffer tank and an outlet of the sodium hydroxide storage tank are respectively connected with the regulating tank, an outlet of the regulating tank and an outlet of the calcium removing agent sodium carbonate storage tank are respectively connected with the sedimentation tank, an outlet of the sedimentation tank is connected with the vacuum drum filter, an outlet of a filtered liquid of the vacuum drum filter, an outlet of the elution sewage buffer tank and an outlet of the carbon dioxide storage tank are respectively connected with the regulating tank, a filtered solid outlet of the vacuum drum filter is connected with precipitated calcium conveying equipment, and an outlet of the regulating tank is connected to the anaerobic tower.
2. The ion exchange regeneration sewage calcium removal system according to claim 1, further comprising a mixer, wherein the outlet of the waste acid buffer tank and the outlet of the waste alkali buffer tank are respectively connected with the mixer, and the outlet of the mixer is further connected with the regulating tank.
3. The ion exchange regeneration sewage water calcium removal system according to claim 1, wherein stirring devices are respectively arranged in the sodium hydroxide storage tank, the calcium removal agent sodium carbonate storage tank, the adjusting tank and the adjusting tank.
4. The ion-exchange regeneration sewage calcium removal system as recited in claim 1, further comprising a pH meter disposed in the conditioning tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023202404.9U CN214115293U (en) | 2020-12-26 | 2020-12-26 | Ion exchange regeneration sewage calcium removal system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023202404.9U CN214115293U (en) | 2020-12-26 | 2020-12-26 | Ion exchange regeneration sewage calcium removal system |
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| CN214115293U true CN214115293U (en) | 2021-09-03 |
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