CN103183393A - Process for treating ammonia nitrogen wastewater by utilizing vacuum degassing membrane technology - Google Patents
Process for treating ammonia nitrogen wastewater by utilizing vacuum degassing membrane technology Download PDFInfo
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- CN103183393A CN103183393A CN2013101169173A CN201310116917A CN103183393A CN 103183393 A CN103183393 A CN 103183393A CN 2013101169173 A CN2013101169173 A CN 2013101169173A CN 201310116917 A CN201310116917 A CN 201310116917A CN 103183393 A CN103183393 A CN 103183393A
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- waste water
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- ammonia nitrogen
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Abstract
The invention relates to a process for treating ammonia nitrogen wastewater by utilizing the vacuum degassing membrane technology, which is characterized by comprising the following steps: 1) enabling discharged wastewater containing ammonia, nitrogen and other impurities to enter an ammonia nitrogen wastewater pool and removing most of suspended matters through pre-treatment; 2) then entering a circulating pool and adding caustic soda solution and steam in the circulating pool; 3) enabling the wastewater to enter one side of a membrane in a vacuum degassing membrane device through a filter under the action of a circulating pump, separating free ammonia in the wastewater in the vacuum degassing membrane device and entering the other side of the membrane; and 4) pumping under the action of a vacuum system. After a plurality of times of circulations, the free ammonia in the wastewater is continuously removed. The process has the benefits that the free ammonia is directly extracted from the ammonia nitrogen wastewater and can be made into ammonia water with high concentration, so that resources are recycled; the process has the advantages of small investment, low running cost, simplicity in operation and easiness in maintenance; according to the process, harmful by-products can not be generated, and secondary pollution is avoided; and the removal rate of ammonia nitrogen in the wastewater is high.
Description
Technical field
The present invention can be directly used in the process field of ammonia nitrogen waste water, especially a kind of technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water.The utilization of vacuum outgas membrane technique in ammonia nitrogen waste water is handled; The utilization of degassing film vacuum outgas method in ammonia nitrogen waste water is handled; Directly from ammonia nitrogen waste water, reclaim ammoniacal liquor (resource recovery).
Background technology
Be accompanied by the development of industrial and agricultural production, the quantity discharged of ammonia nitrogen waste water sharply rises, and has become an important factor in the environmental pollution.Its source is relatively extensive: as the decomposition of itrogenous organic substance; Trade effluents such as synthetic ammonia, coking, petrochemical industry, pharmacy, food; And the use of chemical fertilizer etc. all produces a large amount of high-concentration ammonia nitrogenous wastewaters.Along with the raising of people's living standard, the harm that ammonia nitrogen waste water brings is more and more paid attention to by people.Many experts both domestic and external have carried out many-sided research to this, formed technology such as ammonia blow-off method, chemical precipitation method, ion exchange method, break point chlorination, biological deamination method.But also exist picture in these technology: secondary pollution, cost height, long processing period, shortcoming such as clearance is relatively low, resource can't reclaim.
Summary of the invention
The object of the present invention is to provide a kind of technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water.The present invention utilizes the vacuum outgas membrane technique, the ammonia in the ammonia nitrogen waste water separated from waste water, thus the ammonia nitrogen concentration in the reduction waste water.Simultaneously ammonia fully is recycled into the ammoniacal liquor of high density, direct reuse reduces running cost in producing or selling.It has: energy consumption is low, resource reclaims, characteristics such as running cost is low, simple to operate, convenient management, non-secondary pollution.
The main technical problem to be solved in the present invention has:
1, how ammonia is separated from ammonia nitrogen waste water;
2, how the ammonia nitrogen concentration in the waste water is reduced to preset value;
3, how the ammonia of separating is made the ammoniacal liquor of high density;
4, how to prevent secondary pollution.
Technical scheme of the present invention is:
A kind of technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water may further comprise the steps:
1) waste water that contains impurity such as ammonia nitrogen that is discharged enters the ammonia nitrogen waste water pond, by handling early stage, removes most suspended substance;
2) enter circulating water pool then, in circulating water pool, add caustic soda soln and steam;
3) under the recycle pump effect, waste water process filter, a side that enters the film in the vacuum outgas film device, in the vacuum outgas film device, the free ammonia in the waste water is separated and enters the opposite side of film;
4) under the effect of vacuum system, be drawn out of.After the several times circulation, the free ammonia in the waste water constantly is removed.
Further comprising the steps of after the described step 4:
Enter tertiary amine gas absorption tower after the free ammonia of separating is extracted out by vacuum system from waste water, utilize absorbing pure water, wait to absorb and be stored to that tank used for storing ammonia is sold or reuse after saturated.
Further comprising the steps of afterwards:
The tail gas that tertiary amine gas absorption tower emits enters tail gas absorber, utilizes dilute sulphuric acid that tail gas is absorbed, because the reaction of free ammonia and dilute sulphuric acid is very thorough, avoided the secondary pollution of tail gas to atmosphere, after the dilute sulphuric acid absorption is saturated, has come back to the ammonia nitrogen waste water pond and handle.
Processing through described step 1 makes the SS value≤20mg/L in the waste water.
Waste water is adjusted to pH value in the 10-12 scope under the effect of stirrer, temperature is adjusted to≤55 ℃ in the described step 2.
As preferably, waste water is adjusted to pH value in the 10-12 scope under the effect of stirrer, temperature is adjusted to 25-55 ℃ in the described step 2
Through after the several times circulations, the free ammonia in the waste water constantly is removed in the step 4, after the ammonia nitrogen concentration in waste water arrives preset value, effluxes during to 6-9 with the pH value in the acid adjustment waste water again
The invention has the beneficial effects as follows:
The present invention compares with existing ammonia nitrogenous wastewater treatment technology and has following advantage and positively effect:
1, the present invention directly extracts the ammoniacal liquor that free ammonia is made high density from ammonia nitrogen waste water, has realized the recycling of resource;
2, the present invention invest little, running cost is low, operation of equipment is simple, be easy to safeguard;
3, the present invention does not have harmful byproduct generation, non-secondary pollution;
4, the ammonia-N removal rate height in the waste water of the present invention.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described:
As Fig. 1, a kind of technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water may further comprise the steps:
1) waste water that contains impurity such as ammonia nitrogen that is discharged enters the ammonia nitrogen waste water pond, by handling early stage, removes most suspended substance;
2) enter circulating water pool then, in circulating water pool, add caustic soda soln and steam;
3) under the recycle pump effect, waste water process filter, a side that enters the film in the vacuum outgas film device, in the vacuum outgas film device, the free ammonia in the waste water is separated and enters the opposite side of film;
4) under the effect of vacuum system, be drawn out of.After the several times circulation, the free ammonia in the waste water constantly is removed.
Further comprising the steps of after the described step 4:
Enter tertiary amine gas absorption tower after the free ammonia of separating is extracted out by vacuum system from waste water, utilize absorbing pure water, wait to absorb and be stored to that tank used for storing ammonia is sold or reuse after saturated.
Further comprising the steps of afterwards:
The tail gas that tertiary amine gas absorption tower emits enters tail gas absorber, utilizes dilute sulphuric acid that tail gas is absorbed, because the reaction of free ammonia and dilute sulphuric acid is very thorough, avoided the secondary pollution of tail gas to atmosphere, after the dilute sulphuric acid absorption is saturated, has come back to the ammonia nitrogen waste water pond and handle.
Processing through described step 1 makes the SS value≤20mg/L in the waste water.
Waste water is adjusted to pH value in the 10-12 scope under the effect of stirrer, temperature is adjusted to≤55 ℃ in the described step 2.
As preferably, waste water is adjusted to pH value in the 10-12 scope under the effect of stirrer, temperature is adjusted to 25-55 ℃ in the described step 2
Through after the several times circulations, the free ammonia in the waste water constantly is removed in the step 4, after the ammonia nitrogen concentration in waste water arrives preset value, effluxes during to 6-9 with the pH value in the acid adjustment waste water again
The waste water that contains impurity such as ammonia nitrogen that is discharged enters the ammonia nitrogen waste water pond.By handling early stage, remove most suspended substance, make the SS value≤20mg/L in the waste water, enter circulating water pool then, in circulating water pool, add caustic soda soln and steam, and under the effect of stirrer, adjust to pH value in the 10-12 scope, temperature is adjusted to 25-55 ℃, under the recycle pump effect, waste water is through filter, enter a side of the film in the vacuum outgas film device, in the vacuum outgas film device, the free ammonia in the waste water is separated and enters the opposite side of film, is drawn out of under the effect of vacuum system.After circulation several times, the free ammonia in the waste water constantly is removed, and after ammonia nitrogen concentration in waste water arrives preset value, effluxes during to 6-9 with the pH value in the acid adjustment waste water again.The free ammonia of being extracted out by vacuum system enters tertiary amine gas absorption tower, utilizes absorbing pure water, waits to absorb to be stored to that tank used for storing ammonia is sold or reuse after saturated.The tail gas that tertiary amine gas absorption tower emits, enter tail gas absorber, utilize dilute sulphuric acid that tail gas is absorbed, because the reaction of free ammonia and dilute sulphuric acid is very thorough, so, just avoided the secondary pollution of tail gas to atmosphere, after the dilute sulphuric acid absorption is saturated, has come back to the ammonia nitrogen waste water pond and handle.
Vacuum outgas membrane technique principle of the present invention is: the vacuum outgas membrane technique is a kind of novel gas/liquid membrane separation process process, mainly be hydrophobicity and the ventilation property of utilizing hollow-fibre membrane, namely gas can see through film and liquid can not see through the characteristic of film under certain conditions, at an effluent of film through waste water, opposite side at film vacuumizes, and the ammonia in the waste water just sees through film and enters vacuum one side from waste water one side like this, taken away by vacuum system, so just reach degassing purpose.This patent utilizes the vacuum outgas membrane technique exactly, free ammonia is taken off from waste water, thereby reduce ammonia nitrogen concentration in the waste water.
The principle of raising degassing efficiency of the present invention is: in ammonia nitrogen waste water, ammonia nitrogen is with ammonium ion (NH
4 +) and free ammonia (NH
3) form exist.And, keeping the state of balance according to the equilibrium relationship of (1) formula:
(1) in the formula, the concentration of free ammonia mainly is subjected to the influence of two aspect factors.Be the pH value in the waste water on the one hand, the pH value in waste water is more high, and balance just more moves to the free ammonia direction, and the ratio of free ammonia is just more high; Be the temperature in the waste water on the other hand, the temperature in waste water is more high, and balance just more moves to the free ammonia direction, and the ratio of free ammonia is just more high.By the adjusting to pH value in the waste water and temperature, can make the ammonia nitrogen concentration in the waste water be reduced to preset value in this patent.
The principle that ammoniacal liquor of the present invention reclaims is: in this patent, the free ammonia of separating from the vacuum outgas film by vacuum system, is directly delivered to tertiary amine gas absorption tower with free ammonia, utilizes pure water directly ammonia to be absorbed, and makes the ammoniacal liquor of high density.
The principle that tail gas of the present invention absorbs is: for the ammonia in the tail gas that prevents the ammonia absorption tower causes secondary pollution to air, this patent adopts dilute sulphuric acid that the tail gas on ammonia absorption tower is absorbed.When ammonia ran into dilute sulphuric acid, the reaction of (2) formula took place:
2NH
3+H
2SO
4=（NH
4）
2SO
4…………………………………………（2）
Because it is quite thorough that the reaction of (2) formula is carried out, and therefore, so just avoided the tail gas on ammonia absorption tower to the secondary pollution of air.
Embodiment recited above is described preferred implementation of the present invention; be not that the spirit and scope of the present invention are limited; do not breaking away under the design concept prerequisite of the present invention; common engineering technical personnel make technical scheme of the present invention in this area various modification and improvement; all should fall into protection scope of the present invention, the technology contents that the present invention asks for protection all is documented in claims.
Claims (7)
1. technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water is characterized in that may further comprise the steps:
1) waste water that contains impurity such as ammonia nitrogen that is discharged enters the ammonia nitrogen waste water pond, by handling early stage, removes most suspended substance;
2) enter circulating water pool then, in circulating water pool, add caustic soda soln and steam;
3) under the recycle pump effect, waste water process filter, a side that enters the film in the vacuum outgas film device, in the vacuum outgas film device, the free ammonia in the waste water is separated and enters the opposite side of film;
4) under the effect of vacuum system, be drawn out of.After the several times circulation, the free ammonia in the waste water constantly is removed.
2. the technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water according to claim 1 is characterized in that after the described step 4 further comprising the steps of:
Enter tertiary amine gas absorption tower after the free ammonia of separating is extracted out by vacuum system from waste water, utilize absorbing pure water, wait to absorb and be stored to that tank used for storing ammonia is sold or reuse after saturated.
3. the technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water according to claim 2 is characterized in that after the step of claim 2 further comprising the steps of:
The tail gas that tertiary amine gas absorption tower emits enters tail gas absorber, utilizes dilute sulphuric acid that tail gas is absorbed, because the reaction of free ammonia and dilute sulphuric acid is very thorough, avoided the secondary pollution of tail gas to atmosphere, after the dilute sulphuric acid absorption is saturated, has come back to the ammonia nitrogen waste water pond and handle.
4. the technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water according to claim 1 is characterized in that the processing through described step 1, makes the SS value≤20mg/L in the waste water.
5. the technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water according to claim 1 is characterized in that waste water is adjusted to pH value in the 10-12 scope, temperature adjusted to≤55 ℃ in the described step 2 under the effect of stirrer.
6. the technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water according to claim 1 is characterized in that waste water is adjusted to pH value in the 10-12 scope, temperature is adjusted to 25-55 ℃ in the described step 2 under the effect of stirrer.
7. the technology of utilizing the vacuum outgas membrane technique to handle ammonia nitrogen waste water according to claim 1, it is characterized in that in the described step 4 through after the several times circulation, free ammonia in the waste water constantly is removed, after ammonia nitrogen concentration in waste water arrives preset value, efflux during to 6-9 with the pH value in the acid adjustment waste water again.
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| CN2013101169173A CN103183393A (en) | 2013-04-03 | 2013-04-03 | Process for treating ammonia nitrogen wastewater by utilizing vacuum degassing membrane technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106145488A (en) * | 2014-09-29 | 2016-11-23 | 财团法人工业技术研究院 | Ammonia nitrogen recovery equipment and multi-section ammonia nitrogen wastewater treatment system |
| CN107857395A (en) * | 2017-11-27 | 2018-03-30 | 浙江海盐力源环保科技股份有限公司 | A kind of condensate polishing treatment regenerative wastewater ammonia recovery system |
| CN113880314A (en) * | 2021-11-10 | 2022-01-04 | 广东工业大学 | Treatment method and treatment system for obtaining ammonia water from ammonia nitrogen wastewater |
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| CN1087874A (en) * | 1993-10-21 | 1994-06-15 | 浙江大学 | Ammonia/moisture film separates and recovery ammonia novel process |
| CN101428916A (en) * | 2008-12-23 | 2009-05-13 | 杨高利 | Ammonia nitrogen wastewater treating method |
| EP1909948B1 (en) * | 2005-06-24 | 2011-10-05 | Nanyang Technological University | Contaminated inflow treatment with membrane distillation bioreactor |
| CN202492399U (en) * | 2012-03-27 | 2012-10-17 | 四川科伦药业股份有限公司 | Degassing membrane device for purified water treatment system |
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2013
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Patent Citations (5)
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| CN1087874A (en) * | 1993-10-21 | 1994-06-15 | 浙江大学 | Ammonia/moisture film separates and recovery ammonia novel process |
| EP1909948B1 (en) * | 2005-06-24 | 2011-10-05 | Nanyang Technological University | Contaminated inflow treatment with membrane distillation bioreactor |
| CN101428916A (en) * | 2008-12-23 | 2009-05-13 | 杨高利 | Ammonia nitrogen wastewater treating method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106145488A (en) * | 2014-09-29 | 2016-11-23 | 财团法人工业技术研究院 | Ammonia nitrogen recovery equipment and multi-section ammonia nitrogen wastewater treatment system |
| CN107857395A (en) * | 2017-11-27 | 2018-03-30 | 浙江海盐力源环保科技股份有限公司 | A kind of condensate polishing treatment regenerative wastewater ammonia recovery system |
| CN107857395B (en) * | 2017-11-27 | 2024-01-09 | 浙江海盐力源环保科技股份有限公司 | Condensate fine treatment regeneration wastewater ammonia recovery system |
| CN113880314A (en) * | 2021-11-10 | 2022-01-04 | 广东工业大学 | Treatment method and treatment system for obtaining ammonia water from ammonia nitrogen wastewater |
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Application publication date: 20130703 |