CN115385360A - Low-temperature low-pressure ammonia recovery process - Google Patents
Low-temperature low-pressure ammonia recovery process Download PDFInfo
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- CN115385360A CN115385360A CN202210887887.5A CN202210887887A CN115385360A CN 115385360 A CN115385360 A CN 115385360A CN 202210887887 A CN202210887887 A CN 202210887887A CN 115385360 A CN115385360 A CN 115385360A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/022—Preparation of aqueous ammonia solutions, i.e. ammonia water
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Abstract
The invention discloses a low-temperature low-pressure ammonia recovery process, which comprises the steps that ammonia-containing wastewater is sucked into an evaporation tank by a vacuum pump, the ammonia-containing wastewater is sprayed onto an ultrasonic vaporizing sheet below by a spraying device, the ammonia-containing wastewater is vaporized into ammonia gas, and a coil pipe is arranged below the ultrasonic vaporizing sheet and used for heating the ammonia-containing wastewater; and part of ammonia-containing wastewater enters the spraying device again from the first circulating pipe through the pumping of the circulating pump for circulating evaporation, ammonia gas enters the recovery tank from the exhaust pipe to react with the solvent in the recovery tank, and ammonia water is generated and is pumped by the second water outlet pump to be discharged outwards. The process can reduce the concentration of ammonia in the high-concentration ammonia-containing wastewater to 15mg/L by adopting a negative-pressure normal-temperature evaporation method, and meanwhile, the recovered ammonia water can be recycled for production.
Description
Technical Field
The invention relates to the technical field of ammonia-containing wastewater treatment, in particular to a low-temperature and low-pressure ammonia recovery process.
Background
At present, the treatment of ammonia wastewater at home and abroad is a great difficulty, and the more mature ammonia wastewater mainly comprises the following steps: stripping, pharmaceutical, redox, ion exchange, membrane separation, etc. The air is mainly used as a gas phase in the air stripping method, and the air blower is used for stripping water to remove ammonia in water, but the removal effect is limited, and only ammonium salt solution byproducts can be recovered;
the steam stripping method is to use high-temperature steam as a vapor phase to perform mass and heat transfer exchange with liquid-phase wastewater in a stripping tower to realize the separation and balance of ammonia gas and liquid phase in the tower, so that ammonia in the wastewater is removed, and the steam stripping method has high ammonia removal rate, but needs to consume a large amount of steam and has higher operation cost;
the medicament method mainly utilizes medicaments (such as MAP method, ammonia remover and the like) and ammonia in the wastewater to form precipitate so as to achieve the aim of removing the ammonia in the wastewater, but the medicament method has the problems of great medicament consumption, difficult treatment of the generated precipitate, easy generation of secondary pollution and the like;
the redox method is to completely decompose ammonia in water into nitrogen and water by using a redox principle to realize absolute zero pollutant emission, but at present, the redox method is not mature enough, the efficiency of an oxidant or a reducing agent does not reach an expected target, the cost of a catalyst is extremely high, and the operation effect is not stable and reliable enough;
the ion exchange method is to remove ammonia in water by utilizing resin to exchange and adsorb ammonium ions in water, but in the prior art, the ion exchange method is only suitable for low-concentration and cleaner water samples, and has more problems in the aspects of investment, operation, regeneration treatment and the like aiming at wastewater with large water volume and high ammonia concentration; the membrane separation method is to separate ammonia from water by utilizing the permeability of a membrane, but the membrane flux is greatly influenced by a water sample, the investment cost is extremely high, the service life of the membrane is extremely related to the quality of the membrane, only an ammonium salt solution can be recovered, and the membrane separation method is not applied to the aspect of ammonia wastewater treatment in a large scale.
Although ammonia in wastewater can be removed by various methods, each process method has corresponding disadvantages, and an ammonia recovery process provided by the publication No. CN109607566A can produce qualified ammonia water with a mass concentration of 20% -30%, and the ammonia content in wastewater is stable and not more than 250mg/L, but the ammonia content in wastewater is still high, and the whole process is complex.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a low-temperature and low-pressure ammonia recovery process.
In order to achieve the purpose, the invention adopts the following technical scheme: a low-temperature and low-pressure ammonia recovery process comprises the following process flows:
the vacuum pump sucks ammonia-containing wastewater into the evaporation tank, the ammonia-containing wastewater is sprayed onto an ultrasonic vaporizing sheet below the vacuum pump through a spraying device, the ammonia-containing wastewater is vaporized into ammonia gas, and a coil pipe is arranged below the ultrasonic vaporizing sheet and used for heating the ammonia-containing wastewater;
pumping the waste water containing ammonium ions of less than 15mg/L out of the first water outlet by a first water outlet pump;
part of ammonia-containing wastewater is pumped by a circulating pump and enters the spraying device again from the first circulating pipe for circulating evaporation;
and ammonia gas enters the recovery tank from the exhaust pipe to react with the solvent in the recovery tank, so that ammonia water is generated and is pumped by the second water outlet pump to be discharged outwards.
As a further explanation of the above technical solution: and part of ammonia which does not react with the solvent enters the exhaust pipe through the circulating gas pipe to react with the solvent in the recovery tank again.
As a further explanation of the above technical solution: the solvent enters the recovery tank through the suction pump and the liquid inlet pipe, and the bottom of the recovery tank is communicated with a second circulating pipe communicated with the liquid inlet pipe.
As a further explanation of the above technical solution: the solvent comprises one of water, hydrochloric acid or sulfuric acid.
As a further explanation of the above technical solution: the vacuum pump pumps negative pressure to ensure that the atmospheric pressure in the evaporation tank is-99.99 to-99.96 atmospheric pressures.
As a further explanation of the above technical solution: the concentration of the ammonia water in the recovered solution is 28-30%.
As a further explanation of the above technical solution: the ultrasonic wave vaporization piece and the coil pipe are both positioned below the liquid level of ammonia-containing wastewater, and the spraying device is positioned above the ultrasonic wave vaporization piece.
As a further explanation of the above technical solution: the power of the vacuum pump, the first water outlet pump and the second water outlet pump is 2Kw.
As a further explanation of the above technical solution: the whole process is carried out at a temperature of 28-40 ℃.
As a further explanation of the above technical solution: and a condensing pipe is arranged in the recovery tank.
The invention has the following beneficial effects:
1. according to the invention, the ammonia concentration in the high-concentration ammonia-containing wastewater can be reduced to 15mg/L by adopting a negative-pressure normal-temperature evaporation method through the whole process, and meanwhile, the recovered ammonia water can be recovered for production, the whole process flow is simple to operate, secondary pollution cannot be generated, and meanwhile, the operation cost in the device of the whole process is very low, so that the device can be popularized and used on a large scale.
Drawings
FIG. 1 is a schematic diagram of a low temperature and low pressure ammonia recovery process according to the present invention.
Illustration of the drawings:
1. a vacuum pump; 2. an evaporation tank; 3. a spraying device; 4. ultrasonic vaporization sheet; 5. a first water outlet pump; 6. a first water outlet; 7. a circulation pump; 8. a first circulation pipe; 9. an exhaust pipe; 10. a recovery tank; 11. a second water outlet pump; 12. a circulating gas pipe; 13. a suction pump; 14. a liquid inlet pipe; 15. a second circulation pipe; 16. a coil pipe; 17. a liquid inlet pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present invention provides an embodiment: a low-temperature and low-pressure ammonia recovery process comprises the following process flows:
the vacuum pump 1 sucks ammonia-containing wastewater into the evaporation tank 2, and sprays the ammonia-containing wastewater onto the ultrasonic vaporization sheet 4 below through the spray device 3 to vaporize the ammonia-containing wastewater into ammonia gas, and the coil pipe 16 is arranged below the ultrasonic vaporization sheet and used for heating the ammonia-containing wastewater to separate the ammonia gas from water in the ammonia-containing wastewater;
the waste water containing less than 15mg/L of ammonium ions is pumped out from the first water outlet 6 by the first water outlet pump 5, and the waste water containing less than 15mg/L of ammonium ions cannot cause secondary pollution when being discharged outwards;
part of ammonia-containing wastewater is pumped by the circulating pump 7 and enters the spraying device 3 again from the first circulating pipe 8 for circulating evaporation, wherein the spraying device 3 can be of a structure similar to a shower head, and the spraying holes are small in diameter, so that the ammonia-containing wastewater can be sufficiently atomized, and the atomized ammonia-containing wastewater can be evaporated more easily to generate ammonia gas;
the ammonia gas enters the recovery tank 10 from the exhaust pipe 9 to react with the solvent in the recovery tank 10, the recovery tank 10 is pumped into the recovery tank 10 through an external liquid inlet pump 17, and the ammonia water is generated and pumped out through a second water outlet pump 11 to be discharged.
According to the technical scheme, the whole process adopts a negative-pressure normal-temperature evaporation method to reduce the concentration of ammonia in the wastewater to 15mg/L for the high-concentration ammonia-containing wastewater, and meanwhile, the recovered ammonia water can be recycled for production.
Further, a part of ammonia gas which does not react with the solvent enters the exhaust pipe 9 through the circulating gas pipe 12 to react with the solvent in the recovery tank 10 again, the solvent comprises one of water, hydrochloric acid or sulfuric acid, the concentration of ammonia water in the recovery liquid is 28% -30%, and the ammonia water can be recovered again for production.
Further, the solvent enters the recovery tank 10 through the suction pump 13 and the liquid inlet pipe 14, the bottom of the recovery tank 10 is communicated with the second circulating pipe 15 and communicated with the liquid inlet pipe 14, and after part of ammonia gas is saturated, but residual solvent is not reacted, the residual solvent can enter the liquid inlet pipe 14 through the second circulating pipe 15 again so as to enter the recovery tank 10 to be reacted with the ammonia gas again.
Furthermore, the vacuum pump 1 pumps negative pressure to ensure that the atmospheric pressure in the evaporating pot 2 is-99.99 to-99.96 atmospheric pressures, so that the ammonia-containing wastewater can smoothly enter the spraying device 3 to be atomized and sprayed into the evaporating pot 2.
Further, ultrasonic wave vaporization piece 4 and coil pipe 16 all are in the liquid level below that contains ammonia waste water, and spray set 3 is in ultrasonic wave vaporization piece's top, and ultrasonic wave vaporization piece 4 can make more even and thin that contains ammonia sewage dispersion, becomes the liquid little drop of water, contains the composition that easily produces the foam to some liquid simultaneously, can break the foam, and coil pipe 16 can heat the mist in the thin ammonia waste water that contains to wherein ammonia separates out.
Furthermore, the power of the vacuum pump 1, the first water outlet pump 5 and the second water outlet pump 11 is 2Kw, the operation cost of the whole process is mainly concentrated on the vacuum pump 1, the first water outlet pump 5, the second water outlet pump 11 and the suction pump 13, the operation power of the pump body is 2Kw, the operation cost of the whole process is very low, the power consumption of the whole process in use is 60Kw, the unit price per kilowatt is 0.7 yuan, the operation cost per hour is approximately 28.8 yuan, and the operation cost of the whole equipment is very low.
Furthermore, the whole process can be used at the normal temperature within the use temperature range of 28-40 ℃.
Further, a condenser pipe is provided inside the recovery tank 10, so that the high-temperature ammonia gas can be converted into ammonia water by reacting with the solvent at normal temperature.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A low-temperature and low-pressure ammonia recovery process is characterized in that: the process flow comprises the following steps:
the vacuum pump sucks ammonia-containing wastewater into the evaporation tank, the ammonia-containing wastewater is sprayed onto an ultrasonic vaporizing sheet below the vacuum pump through a spraying device, the ammonia-containing wastewater is vaporized into ammonia gas, and a coil pipe is arranged below the ultrasonic vaporizing sheet and used for heating the ammonia-containing wastewater;
pumping the waste water containing ammonium ions of less than 15mg/L out of the first water outlet by a first water outlet pump;
part of ammonia-containing wastewater is pumped by a circulating pump and enters the spraying device again from the first circulating pipe for circulating evaporation;
and ammonia gas enters the recovery tank from the exhaust pipe to react with the solvent in the recovery tank, so that ammonia water is generated and is pumped by the second water outlet pump to be discharged outwards.
2. A low temperature and low pressure ammonia recovery process according to claim 1, wherein: and part of ammonia which does not react with the solvent enters the exhaust pipe through the circulating gas pipe to react with the solvent in the recovery tank again.
3. A low temperature and low pressure ammonia recovery process according to claim 1, wherein: the solvent enters the recovery tank through the suction pump and the liquid inlet pipe, and the bottom of the recovery tank is communicated with a second circulating pipe communicated with the liquid inlet pipe.
4. A low temperature and low pressure ammonia recovery process according to claim 1, wherein: the solvent comprises one of water, hydrochloric acid or sulfuric acid.
5. A low temperature and low pressure ammonia recovery process according to claim 1, wherein: the vacuum pump pumps negative pressure to ensure that the atmospheric pressure in the evaporation tank is-99.99 to-99.96 atmospheric pressures.
6. A low temperature and low pressure ammonia recovery process according to claim 1, wherein: the concentration of the ammonia water in the recovered solution is 28-30%.
7. A low temperature and low pressure ammonia recovery process according to claim 1, wherein: the ultrasonic wave vaporization piece and the coil pipe are both arranged below the liquid level of ammonia-containing wastewater, and the spraying device is arranged above the ultrasonic wave vaporization piece.
8. A low temperature and low pressure ammonia recovery process according to claim 1, wherein: the power of the vacuum pump, the first water outlet pump and the second water outlet pump is 2Kw.
9. A low temperature and low pressure ammonia recovery process according to claim 1, wherein: the whole process is used at a temperature ranging from 28 to 40 ℃.
10. A low temperature and low pressure ammonia recovery process according to claim 1, wherein: and a condensing pipe is arranged in the recovery tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210887887.5A CN115385360A (en) | 2022-07-26 | 2022-07-26 | Low-temperature low-pressure ammonia recovery process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210887887.5A CN115385360A (en) | 2022-07-26 | 2022-07-26 | Low-temperature low-pressure ammonia recovery process |
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| CN115385360A true CN115385360A (en) | 2022-11-25 |
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| CN202210887887.5A Pending CN115385360A (en) | 2022-07-26 | 2022-07-26 | Low-temperature low-pressure ammonia recovery process |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2532067Y (en) * | 2002-05-04 | 2003-01-22 | 宜兴市天立环保有限公司 | Dehydrogenation and denitrification device for waste water |
| CN1412123A (en) * | 2002-12-09 | 2003-04-23 | 南京大学环境学院 | Method for blowing and removing volatile pollutant in waste water by using ultrasonic wave |
| CN102167454A (en) * | 2011-03-04 | 2011-08-31 | 大连理工大学 | Device and method for recovering ammonia during wastewater treatment |
| KR101476404B1 (en) * | 2013-08-19 | 2014-12-23 | 한국동서발전(주) | Method for treating scrapped ammonia and system thereof, and ammonia injection system of denitrification apparatus |
| CN207313355U (en) * | 2017-10-17 | 2018-05-04 | 童家亮 | A kind of high ammonia-nitrogen wastewater processing and resource recovery equipment |
| CN213266047U (en) * | 2020-09-04 | 2021-05-25 | 深圳职业技术学院 | Ammonia nitrogen stripping device based on ultrasonic atomization |
| CN114605017A (en) * | 2020-12-07 | 2022-06-10 | 湖南金保树环保科技有限公司 | Treatment process of ammonia nitrogen wastewater |
| CN216878693U (en) * | 2021-12-29 | 2022-07-05 | 北京赛博宇科技发展有限公司 | Ammonia water ultrasonic atomization evaporation device |
-
2022
- 2022-07-26 CN CN202210887887.5A patent/CN115385360A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2532067Y (en) * | 2002-05-04 | 2003-01-22 | 宜兴市天立环保有限公司 | Dehydrogenation and denitrification device for waste water |
| CN1412123A (en) * | 2002-12-09 | 2003-04-23 | 南京大学环境学院 | Method for blowing and removing volatile pollutant in waste water by using ultrasonic wave |
| CN102167454A (en) * | 2011-03-04 | 2011-08-31 | 大连理工大学 | Device and method for recovering ammonia during wastewater treatment |
| KR101476404B1 (en) * | 2013-08-19 | 2014-12-23 | 한국동서발전(주) | Method for treating scrapped ammonia and system thereof, and ammonia injection system of denitrification apparatus |
| CN207313355U (en) * | 2017-10-17 | 2018-05-04 | 童家亮 | A kind of high ammonia-nitrogen wastewater processing and resource recovery equipment |
| CN213266047U (en) * | 2020-09-04 | 2021-05-25 | 深圳职业技术学院 | Ammonia nitrogen stripping device based on ultrasonic atomization |
| CN114605017A (en) * | 2020-12-07 | 2022-06-10 | 湖南金保树环保科技有限公司 | Treatment process of ammonia nitrogen wastewater |
| CN216878693U (en) * | 2021-12-29 | 2022-07-05 | 北京赛博宇科技发展有限公司 | Ammonia water ultrasonic atomization evaporation device |
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