CN103183429A - Process for treating ammonia nitrogen wastewater by utilizing direct contact type degassing membrane technology - Google Patents
Process for treating ammonia nitrogen wastewater by utilizing direct contact type degassing membrane technology Download PDFInfo
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- CN103183429A CN103183429A CN2013101169991A CN201310116999A CN103183429A CN 103183429 A CN103183429 A CN 103183429A CN 2013101169991 A CN2013101169991 A CN 2013101169991A CN 201310116999 A CN201310116999 A CN 201310116999A CN 103183429 A CN103183429 A CN 103183429A
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Abstract
The invention relates to a process for treating ammonia nitrogen wastewater by utilizing the direct contact type degassing membrane technology, which is characterized by comprising the following steps: 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, so that the SS value in the wastewater is less than or equal to 20 mg/L; then entering a wastewater circulating pool, adding caustic soda solution and steam in the wastewater circulating pool, regulating the PH value to the range of 10-12 under the action of an agitator and adjusting the temperature to be less than or equal to 55 DEG C; enabling the wastewater to enter one side of a membrane in a direct contact type degassing membrane device through a filter under the lifting of a wastewater circulating pump and; and returning to the wastewater circulating pool after the ammonia nitrogen wastewater goes out of a direct contact type degassing membrane to form an ammonia nitrogen wastewater circulation. The process has the benefits that the free ammonia is directly extracted from the ammonia nitrogen wastewater and can be made into ammonium sulfate solution with high concentration, so that resources are recycled; and the process has the characteristics of lower energy consumption, complete ammonia removal, low running cost, simplicity in operation, convenience in management and the like.
Description
Technical field
The present invention relates to environmental technology field, especially a kind of technology of utilizing direct contact type degassing film technical finesse ammonia nitrogen waste water, the present invention can be directly used in the processing of ammonia nitrogen waste water, is specifically related to utilization, direct contact type degassing film technology utilization and sour absorption process the utilization in ammonia nitrogen waste water handle in ammonia nitrogen waste water handle of degassing film technology in ammonia nitrogen waste water is handled.
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 direct contact type degassing film technical finesse ammonia nitrogen waste water, the present invention utilizes direct contact type degassing film technology, the ammonia in the ammonia nitrogen waste water is separated from waste water, thus the ammonia nitrogen concentration in the reduction waste water.Simultaneously ammonia and dilute sulphuric acid are reacted the ammonium sulfate that is recycled into 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 ammonium sulfate of high density;
4, how to prevent secondary pollution.
Technical scheme of the present invention is:
A kind of technology of utilizing direct contact type degassing film technical finesse 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, remove most suspended substance, make the SS value≤20mg/L in the waste water;
2) enter the waste water circulating water pool then, in the waste water 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 adjusted to≤55 ℃;
3) promote by the waste water recycle pump, waste water is through filter, a side that enters film in the direct contact type degassing film device;
4) after ammonia nitrogen waste water comes out from the direct contact type degassing film, get back to the waste water circulatory pool, constitute the circulation of ammonia nitrogen waste water.
In the described step 2 temperature is adjusted to 25-55 ℃.
The described technology of direct contact type degassing film technical finesse ammonia nitrogen waste water of utilizing is further comprising the steps of:
With the dilute sulphuric acid in the diluted acid circulatory pool, promote by acid circulating pump, dilute sulphuric acid enters the opposite side of film in the direct contact type degassing film device through filter;
Dilute sulphuric acid is got back in the diluted acid circulatory pool after coming out from the direct contact type degassing film, constitutes the circulation of dilute sulphuric acid.
Described ammonia nitrogen waste water and dilute sulphuric acid are entered in the direct contact type degassing film device simultaneously, the free ammonia in the ammonia nitrogen waste water is separated, and enters the opposite side of direct contact type degassing film, namely in the dilution heat of sulfuric acid, reacts generation ammonium sulfate with dilute sulphuric acid.
Described with ammonia nitrogen waste water through circulation several times after, 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.
Described with dilute sulphuric acid process several cycles, after the arrival absorption is saturated, is stored to the ammonium sulfate storage tank and sells or reuse.
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 isolates the ammoniumsulphate soln that free ammonia is made high density from ammonia nitrogen waste water, has realized the recycling of resource;
2, the present invention have that energy consumption is lower, deamination very thoroughly, characteristics such as low, simple to operate, the convenient management of running cost.；
3, the present invention does not have harmful byproduct generation, non-secondary pollution;
4, because the reaction of ammonia and dilute sulphuric acid is very thorough, so the ammonia-N removal rate in the waste water of the present invention is very high.
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 direct contact type degassing film technical finesse 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, remove most suspended substance, make the SS value≤20mg/L in the waste water;
2) enter the waste water circulating water pool then, in the waste water 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 adjusted to≤55 ℃;
3) promote by the waste water recycle pump, waste water is through filter, a side that enters film in the direct contact type degassing film device;
4) after ammonia nitrogen waste water comes out from the direct contact type degassing film, get back to the waste water circulatory pool, constitute the circulation of ammonia nitrogen waste water.
In the described step 2 temperature is adjusted to 25-55 ℃.
The described technology of direct contact type degassing film technical finesse ammonia nitrogen waste water of utilizing is further comprising the steps of:
With the dilute sulphuric acid in the diluted acid circulatory pool, promote by acid circulating pump, dilute sulphuric acid enters the opposite side of film in the direct contact type degassing film device through filter;
Dilute sulphuric acid is got back in the diluted acid circulatory pool after coming out from the direct contact type degassing film, constitutes the circulation of dilute sulphuric acid.
Described ammonia nitrogen waste water and dilute sulphuric acid are entered in the direct contact type degassing film device simultaneously, the free ammonia in the ammonia nitrogen waste water is separated, and enters the opposite side of direct contact type degassing film, namely in the dilution heat of sulfuric acid, reacts generation ammonium sulfate with dilute sulphuric acid.
Described with ammonia nitrogen waste water through circulation several times after, 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.
Described with dilute sulphuric acid process several cycles, after the arrival absorption is saturated, is stored to the ammonium sulfate storage tank and sells or reuse.
On the one hand, 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 the waste water circulating water pool then, in the waste water 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 ℃, promoting by the waste water recycle pump, waste water is through filter, enter a side of film in the direct contact type degassing film device, after coming out, get back to the waste water circulatory pool, so just constitute the circulation of ammonia nitrogen waste water.On the other hand, the dilute sulphuric acid in the diluted acid circulatory pool promotes by acid circulating pump, and dilute sulphuric acid enters the opposite side of film in the direct contact type degassing film device through filter, after coming out, gets back in the diluted acid circulatory pool, so just constitutes the circulation of dilute sulphuric acid.After ammonia nitrogen waste water and dilute sulphuric acid entered in the direct contact type degassing film device simultaneously, the free ammonia in the ammonia nitrogen waste water was separated, and enters the opposite side of film, namely in the dilution heat of sulfuric acid, reacts generation ammonium sulfate with dilute sulphuric acid.Ammonia nitrogen waste water through circulation several times after, 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.Dilute sulphuric acid, is stored to the ammonium sulfate storage tank and sells or reuse after the arrival absorption is saturated through several cycles.
Direct contact type degassing film know-why of the present invention: direct contact type degassing film technology 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, at the opposite side of the film dilute sulphuric acid of flowing through, the ammonia in the waste water just sees through film and enters dilute sulphuric acid one side from waste water one side like this, absorbed by dilute sulphuric acid, so just reach degassing purpose.The present invention utilizes direct contact type degassing film technology exactly, free ammonia is taken off from waste water, thereby reduce ammonia nitrogen concentration in the waste water.
Raising degassing efficiency know-why of the present invention: 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.Pass through the adjusting to pH value in the waste water and temperature among the present invention, regulate the ratio of free ammonia in the waste water, utilize circulation technology, ammonia nitrogen waste water is carried out repeatedly circular treatment, free ammonia in the ammonia nitrogen waste water constantly is separated from ammonia nitrogen waste water, thereby makes the ammonia nitrogen concentration in the waste water be reduced to preset value.
Raising ammonium sulfate concentrations know-why of the present invention: among the present invention, the free ammonia of from direct contact type degassing film ammonia nitrogen waste water one side, separating, absorbed by the dilute sulphuric acid of direct contact type degassing film opposite side, generate ammoniumsulphate soln, shown in reaction formula following (2) formula.
2NH
3+H
2SO
4=（NH
4）
2SO
4……………………………………………（2）
Utilize circulation technology, dilute sulphuric acid is repeatedly circulated, the reaction in above-mentioned (2) formula is all being carried out in each circulation, and is saturated up to absorbing, and so just formed the ammoniumsulphate soln of high density.
The secondary pollution know-why that prevents of the present invention: from this technology as can be seen, unique byproduct that whole process produces is ammonium sulfate, can carry out reuse according to the needs of self or sells.In addition, there are not other materials to produce.Therefore, there is not secondary pollution problem yet.
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 (6)
1. technology of utilizing direct contact type degassing film technical finesse 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, remove most suspended substance, make the SS value≤20mg/L in the waste water;
2) enter the waste water circulating water pool then, in the waste water 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 adjusted to≤55 ℃;
3) promote by the waste water recycle pump, waste water is through filter, a side that enters film in the direct contact type degassing film device;
4) after ammonia nitrogen waste water comes out from the direct contact type degassing film, get back to the waste water circulatory pool, constitute the circulation of ammonia nitrogen waste water.
2. the technology of utilizing direct contact type degassing film technical finesse ammonia nitrogen waste water according to claim 1 is characterized in that in the described step 2 temperature being adjusted to 25-55 ℃.
3. the technology of utilizing direct contact type degassing film technical finesse ammonia nitrogen waste water according to claim 1 is characterized in that the described technology of direct contact type degassing film technical finesse ammonia nitrogen waste water of utilizing is further comprising the steps of:
With the dilute sulphuric acid in the diluted acid circulatory pool, promote by acid circulating pump, dilute sulphuric acid enters the opposite side of film in the direct contact type degassing film device through filter;
Dilute sulphuric acid is got back in the diluted acid circulatory pool after coming out from the direct contact type degassing film, constitutes the circulation of dilute sulphuric acid.
4. the technology of utilizing direct contact type degassing film technical finesse ammonia nitrogen waste water according to claim 3, it is characterized in that described ammonia nitrogen waste water and dilute sulphuric acid being entered in the direct contact type degassing film device simultaneously, free ammonia in the ammonia nitrogen waste water is separated, enter the opposite side of direct contact type degassing film, be in the dilution heat of sulfuric acid, react generation ammonium sulfate with dilute sulphuric acid.
5. the technology of utilizing direct contact type degassing film technical finesse ammonia nitrogen waste water according to claim 3, it is characterized in that described with ammonia nitrogen waste water through several times the circulation after, 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.
6. the technology of utilizing direct contact type degassing film technical finesse ammonia nitrogen waste water according to claim 3, it is characterized in that described with dilute sulphuric acid through several cycles, arrive absorb saturated after, be stored to the ammonium sulfate storage tank and sell or reuse.
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| CN2013101169991A CN103183429A (en) | 2013-04-03 | 2013-04-03 | Process for treating ammonia nitrogen wastewater by utilizing direct contact type degassing membrane technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106045175A (en) * | 2016-07-26 | 2016-10-26 | 苏州新能环境技术股份有限公司 | Ammonia-nitrogen wastewater treatment system and process based on PTFE (polytetrafluoroethylene) deamination membrane component |
| CN107758960A (en) * | 2017-10-18 | 2018-03-06 | 江苏理工学院 | A kind of processing method of ammonia waste water |
| CN113307413A (en) * | 2021-06-21 | 2021-08-27 | 天津绿诺环保科技有限公司 | Device for removing ammonia nitrogen in synthetic ammonia industrial wastewater and treatment method and application thereof |
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| WO2006137808A1 (en) * | 2005-06-24 | 2006-12-28 | Nanyang Technological University | Contaminated inflow treatment with membrane distillation bioreactor |
| CN102295378A (en) * | 2010-06-28 | 2011-12-28 | 中国石油化工股份有限公司 | Treatment and recycling method of ammonia nitrogen containing high-salt catalyst wastewater |
| CN102757149A (en) * | 2012-08-06 | 2012-10-31 | 哈尔滨工业大学 | Multi-stage membrane distillation treating method for ammonia nitrogen wastewater |
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2013
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Patent Citations (3)
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|---|---|---|---|---|
| WO2006137808A1 (en) * | 2005-06-24 | 2006-12-28 | Nanyang Technological University | Contaminated inflow treatment with membrane distillation bioreactor |
| CN102295378A (en) * | 2010-06-28 | 2011-12-28 | 中国石油化工股份有限公司 | Treatment and recycling method of ammonia nitrogen containing high-salt catalyst wastewater |
| CN102757149A (en) * | 2012-08-06 | 2012-10-31 | 哈尔滨工业大学 | Multi-stage membrane distillation treating method for ammonia nitrogen wastewater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106045175A (en) * | 2016-07-26 | 2016-10-26 | 苏州新能环境技术股份有限公司 | Ammonia-nitrogen wastewater treatment system and process based on PTFE (polytetrafluoroethylene) deamination membrane component |
| CN107758960A (en) * | 2017-10-18 | 2018-03-06 | 江苏理工学院 | A kind of processing method of ammonia waste water |
| CN113307413A (en) * | 2021-06-21 | 2021-08-27 | 天津绿诺环保科技有限公司 | Device for removing ammonia nitrogen in synthetic ammonia industrial wastewater and treatment method and application thereof |
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Application publication date: 20130703 |