CN1253911A - Regeneration method of effluent brine and its device - Google Patents
Regeneration method of effluent brine and its device Download PDFInfo
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- CN1253911A CN1253911A CN98111580A CN98111580A CN1253911A CN 1253911 A CN1253911 A CN 1253911A CN 98111580 A CN98111580 A CN 98111580A CN 98111580 A CN98111580 A CN 98111580A CN 1253911 A CN1253911 A CN 1253911A
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Abstract
The present invention relates to a method for regeneration of waste saline solution produced by regenerating exchange resin in the course of softening water and its recovery and circulating utilization method and its equipment. It is characterized by adding effective quantity of alkali and CO2 gas in waste saline solution, and making them fully mix and react to make calcium and magnesium ions being in said waste solution produce the salt insoluble in water, then using solid-liquid separation equipment to make separation and recovery.
Description
The invention relates to a method and a device for regenerating waste salt solution by resin for ion exchange softened water.
Chinese patent 95106410 discloses a method for recycling waste salt solution generated by regenerating ion exchange resin in the course of water softening treatment, which comprises adding effective amount of sodium hydroxide and sodium carbonate into the waste salt solution, removing precipitate, adding effective amount of sodium chloride, measuring and adjusting PH and concentration, and recycling. The method has high cost due to the use of sodium carbonate; in addition, since the added sodium hydroxide and sodium carbonate are both strong in alkalinity, the treatment solution needs to be neutralized to adjust the pH after removing calcium and magnesium ions, so that the treatment process is complex and the treatment cost is high; in addition, the amount of alkali and/or sodium carbonate added in the treatment is insufficient, and the calcium and magnesium ions in the waste salt solution are not completely removed; the excessive addition causes the increase of alkalinity and increases the amount of acid used for neutralization; moreover, the method can not completely remove calcium and magnesium ions in the waste salt solution. There is therefore still room for improvement.
The invention aims to overcome the defects of the prior art and provide a waste salt solution regeneration method which is simple and convenient in waste solution regeneration, high in efficiency, good in effect, low in cost and capable of thoroughly removing calcium and magnesium components in the waste solution.
Another object of the present invention is to provide a processing apparatus applying the above method.
The main improvement of the method is that carbon dioxide is used to replace sodium carbonate, so that the waste salt solution reacts with the carbon dioxide under the alkaline condition to generate precipitable calcium and magnesium carbonates, thereby achieving the purpose of removing calcium and magnesium ions in the waste salt solution. Specifically, the method for regenerating the waste brine comprises the step of adding an effective amount of alkali into the waste brine, and is characterized in that an effective amount of carbon dioxide is added through aeration.
The effective amount of the invention refers to the total amount of calcium and magnesium ions in the waste salt solution which is measured according to the dosage or slight excess required by complete positive and negative reaction, and corresponding (complete reaction) alkali and carbon dioxide are added. In the invention, the optimal ratio ofthe total amount of calcium and magnesium ions in the waste salt solution to alkali and carbon dioxide is 1: 2: 1, and the reaction formula is as follows:
the key carbon dioxide has three functions, namely, the carbon dioxide is replaced to react with calcium ions and magnesium ions to generate precipitated carbonate, so that the calcium ions and the magnesium ions are separated and removed from the waste salt solution; secondly, the carbon dioxide is acidic in water, so that the carbon dioxide has the function of neutralizing and regulating the PH at the same time, and the pH can be neutralized and regulated by adding acid after reduction treatment; the cost of the carbon dioxide is low, so that the regeneration treatment cost of the waste salt solution can be reduced. Carbon dioxide is added, particularly carbon dioxide gas is added through aeration, so that the reaction is more complete through aeration, calcium ions and magnesium ions in the waste salt solution can be completely removed, and an additional stirring device is not needed. The alkali added in the invention, particularly sodium hydroxide is the best, and can replace part of regeneration salt. The regeneration treatment can be carried out by mixing the waste salt solution, the alkali and the carbon dioxide at the same time, or mixing the waste salt solution with the alkali and then introducing the carbon dioxide into the mixed solution, which do not influence the invention.
The waste liquid regenerating device includes a regenerating container, and features that the regenerating container has alkali liquid inlet, inclined pipe or inclined plate solid-liquid separator, aerator and mud discharger. The regeneration container of the invention is used for waste liquidreaction and regeneration, and can be a hollow container with a round shape, a rectangular square shape or other geometric shapes, wherein the rectangular square shape is preferred, and the installation of an inclined tube or an inclined plate is convenient because of no circular arc structure. The solid-liquid separation device mainly has the function of accelerating the sedimentation separation of water-insoluble product carbonate, and is particularly preferred to be an inclined tube, so that the sedimentation separation effect is good due to a plurality of contact surfaces. The aeration device is characterized in that carbon dioxide gas is introduced into the regenerated liquid (or the mixed liquid of the regenerated liquid and the alkali liquor), and the aeration device has the stirring function at the same time, so that the waste salt liquid, the alkali liquor and the carbon dioxide can be fully mixed and reacted, calcium ions and magnesium ions can be thoroughly removed, the regenerated liquid can be completely regenerated, and the aeration device is particularly preferred. The alkali liquor inlet of the invention is preferably a perforated pipe, which is beneficial to fully and uniformly mixing the alkali and the waste salt liquor. The mud discharging device consists of a conical mud collecting hopper and a mud discharging pipe (opening).
The concept and the construction according to the invention will be explained below with reference to the description of two non-limiting embodiments.
FIG. 1 is a schematic structural diagram of an apparatus according to a first embodiment of the present invention.
Fig. 2 and 3 are schematic structural views of a device according to a second embodiment of the present invention.
Example 1: referring to fig. 1, a water level observation sight glass 2 is arranged at the upper part of a rectangular regeneration container 1, an inclined tube 3 for accelerating sedimentation is arranged at the middle lower part, an aeration device 5, a porous alkali liquor inlet tube 4 and a waste salt liquor inlet/emptying port 7 are arranged below the inclined tube, and a conical sludge collection hopper 8 and a sludge discharge pipe 6 (or a sludge discharge port) are arranged at the bottom. The regeneration waste liquid to be treated is injected into a regeneration container through a liquid inlet 7, the total content of calcium ions and magnesium ions is measured, and alkali (solution) and carbon dioxide gas are added according to the ratio of 1: 2: 1. Alkali liquor enters from the perforated pipe 4 to be mixed with the regeneration waste liquor, carbon dioxide gas is aerated and blown in from the aeration device 5, the aeration time is generally 15-40 minutes, the regeneration waste liquor, the alkali liquor and the carbon dioxide are fully contacted and reacted under aeration and stirring to be milky, calcium and magnesium in the waste regeneration liquid are generated into calcium carbonate and magnesium carbonate precipitates, the calcium carbonate and the magnesium carbonate precipitates are separated from salt liquid and fall into a conical mud collecting hopper through the accelerated settling of an inclined pipe (standing for about 1 hour), and the precipitated carbonate is discharged by a mud discharging device by depending on the static pressure of water in a regeneration container. The separated treated liquid can be reused for regeneration of saturated resin in the exchange column by supplementing proper amount of salt and water. The alkali liquor inlet and the waste salt liquor inlet can also be arranged at the upper part.
Example 2: referring to fig. 2 and 3, as in example 1, the regeneration device comprises a reaction regeneration container 1 and a mixing container 9, a liquid inlet 7 (which may be below or above) and a pipe chute separation device 3 are arranged in the reaction regeneration container 1, and an aeration device 5, a conical sludge collecting hopper 8 and a sludge discharge device 6 are arranged below the pipe chute. The mixing container 9 is provided with a stirring device 12, a waste salt liquid inlet 10 and an alkali liquid inlet 11, and the bottom of the mixing container is provided with a liquid outlet 13 and a vent 14. After the waste salt liquid and the alkali liquor are fully mixed in the mixing container, the mixture is sent to a regeneration container from a liquid outlet, and precipitated carbonate is generated in the regeneration container through carbon dioxide aeration reaction and falls into a mud collecting hopper to be discharged after being separated by an inclined pipe. The structure is favorable for being directly connected with the softened water device in series and combined for use, so that the resin regeneration and the waste liquid salt solution regeneration are circulated, and an intermediate container can be omitted.
The invention adopts aeration to fill carbon dioxide, so the reaction is violent, the whole process can be completely replaced and separated, the regeneration is thorough, and the effect is good. And the method also has the advantages of simple regeneration and low cost, and the treatment cost of each ton of waste salt solution is about 20 yuan, which is only 1/5 added with sodium carbonate. The carbon dioxide is added to react with calcium and magnesium ions to generate precipitates, and the PH of the regeneration liquid is adjusted at the same time, so that the reaction naturally reaches neutral without adding acid to adjust the PH. The device has the advantages of simple regeneration and high efficiency, and can be matched with a cation water softening device for use, so that the regenerated waste liquid can be recycled after being treated only by adding a proper amount of salt and supplementing a proper amount of water.
Claims (9)
1. A method for regenerating waste brine, which comprises adding an effective amount of alkali to the waste brine, and is characterized in that an effective amount of carbon dioxide is added by aeration.
2. The method for regenerating waste brine according to claim 1, wherein the ratio of the total amount of calcium and magnesium ions in the waste brine to alkali to carbon dioxide is 1: 2: 1.
3. The method for regenerating waste brine according to claim 1 or 2, wherein said alkali is sodium hydroxide.
4. A regenerated waste liquid treater is composed of a regenerating container with alkali liquid inlet, inclined tube or inclined plate for separating solid from liquid, aerating unit and mud discharger.
5. The apparatus for treating a regenerated waste liquid according to claim 4, wherein said regeneration container is a rectangular container.
6. The apparatus for treating a regeneration waste liquid according to claim 4, wherein said solid-liquid separation device is an inclined tube.
7. The apparatus for treating a regenerated waste liquid according to claim 4, wherein said alkali liquid inlet is a perforated pipe.
8. The apparatus for treating a regenerated waste liquid according to claim 4, characterized in that said alkali liquid inlet is provided at a lower portion.
9. The regeneration waste liquid treatment apparatus according to claim 4, 5, 6, 7 or 8, wherein said aeration means is provided below the solid-liquid separation means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98111580A CN1253911A (en) | 1998-11-17 | 1998-11-17 | Regeneration method of effluent brine and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98111580A CN1253911A (en) | 1998-11-17 | 1998-11-17 | Regeneration method of effluent brine and its device |
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| CN1253911A true CN1253911A (en) | 2000-05-24 |
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| CN98111580A Pending CN1253911A (en) | 1998-11-17 | 1998-11-17 | Regeneration method of effluent brine and its device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102986579A (en) * | 2012-12-14 | 2013-03-27 | 浙江海洋学院 | Multiple-effect super-intensification circulating breeding device |
| CN103010411A (en) * | 2012-12-14 | 2013-04-03 | 浙江海洋学院 | Large-scale storing and transporting ship for live aquatic products |
| CN103011508A (en) * | 2012-12-14 | 2013-04-03 | 浙江海洋学院 | Circulating water treatment device for industrial culture |
| CN104496041A (en) * | 2014-12-22 | 2015-04-08 | 内蒙古久科康瑞环保科技有限公司 | Softening device for treating high-hardness, low-alkalinity salt-containing wastewater |
| CN105906129A (en) * | 2016-06-12 | 2016-08-31 | 鲁西化工集团股份有限公司 | Method for reutilization of water resources and transformation and utilization of salt in waste water |
| CN109796084A (en) * | 2017-11-17 | 2019-05-24 | 济南欧瑞实业有限公司 | Salt water demineralizer |
| CN110479734A (en) * | 2019-07-31 | 2019-11-22 | 同济大学 | A kind of method and device thereof using alkaline melt harmless treatment industrial waste salt |
-
1998
- 1998-11-17 CN CN98111580A patent/CN1253911A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102986579A (en) * | 2012-12-14 | 2013-03-27 | 浙江海洋学院 | Multiple-effect super-intensification circulating breeding device |
| CN103010411A (en) * | 2012-12-14 | 2013-04-03 | 浙江海洋学院 | Large-scale storing and transporting ship for live aquatic products |
| CN103011508A (en) * | 2012-12-14 | 2013-04-03 | 浙江海洋学院 | Circulating water treatment device for industrial culture |
| CN102986579B (en) * | 2012-12-14 | 2014-12-31 | 浙江海洋学院 | Multiple-effect super-intensification circulating breeding device |
| CN103010411B (en) * | 2012-12-14 | 2015-11-18 | 浙江海洋学院 | Large-scale aquatic products are lived and are stored up carrier |
| CN104496041A (en) * | 2014-12-22 | 2015-04-08 | 内蒙古久科康瑞环保科技有限公司 | Softening device for treating high-hardness, low-alkalinity salt-containing wastewater |
| CN105906129A (en) * | 2016-06-12 | 2016-08-31 | 鲁西化工集团股份有限公司 | Method for reutilization of water resources and transformation and utilization of salt in waste water |
| CN109796084A (en) * | 2017-11-17 | 2019-05-24 | 济南欧瑞实业有限公司 | Salt water demineralizer |
| CN110479734A (en) * | 2019-07-31 | 2019-11-22 | 同济大学 | A kind of method and device thereof using alkaline melt harmless treatment industrial waste salt |
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