CN114315029A - Method for removing nitrate nitrogen in water by promoting denitrification through magnetic resin - Google Patents
Method for removing nitrate nitrogen in water by promoting denitrification through magnetic resin Download PDFInfo
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- CN114315029A CN114315029A CN202111634438.1A CN202111634438A CN114315029A CN 114315029 A CN114315029 A CN 114315029A CN 202111634438 A CN202111634438 A CN 202111634438A CN 114315029 A CN114315029 A CN 114315029A
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Abstract
The invention belongs to the technical field of removal of nitrate nitrogen in water, and particularly relates to a method for removing nitrate nitrogen in water by promoting denitrification through magnetic resin. The invention forms a set of complete flow and system for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin through primary magnetic resin adsorption treatment, secondary magnetic resin adsorption treatment, tertiary magnetic resin adsorption treatment and subsequent cyclone separation treatment and denitrification treatment, and simultaneously uses control parameters of gradient temperature control and gradient treatment time control, thereby having the characteristics of shortening the retention time of sewage in a reactor, reducing the volume of the reactor and improving the removal effect of nitrate nitrogen in sewage.
Description
Technical Field
The invention belongs to the technical field of removal of nitrate nitrogen in water, and particularly relates to a method for removing nitrate nitrogen in water by promoting denitrification through magnetic resin.
Background
Nitrate nitrogen widely exists in natural water, the concentration of the nitrate nitrogen is in a lower level under the normal circulation action of natural substances, but with the rapid development of industry and agriculture, the population is increased sharply, the amount of ammonia-containing wastewater discharged into the water is increased continuously, the self-purification capability of the nature is exceeded, the problem of nitrate nitrogen pollution of water source water in the global range is caused, the condition that the nitrate nitrogen exceeds the standard is shown in the underground water of Europe, researches show that 60% of underground water of China belongs to poor water, wherein 67.78% of the proportion of the shallow underground water of Huaihe river basin exceeds the standard, the excessive concentration of the nitrate nitrogen is a main exceeding factor, and the excessive intake of the nitrate nitrogen can directly cause symptoms such as abdominal pain, diarrhea, hypertension and the like, and can possibly induce blue baby disease, and seriously affect the body health of human beings.
The prior art has the following problems: aiming at the water source with over-standard nitrate helium, the water source can be drunk only through proper treatment, and the traditional treatment methods comprise a physical separation method, a chemical reduction method, biological denitrification and denitrification, a permeable reaction wall and the like, and the traditional treatment methods all have the advantages and the disadvantages of the traditional treatment methods, wherein the ion exchange method using the resin is a simple and efficient physical removal method, is widely applied to the water treatment industry, and urgently needs a method for removing nitrate nitrogen in water by promoting denitrification through magnetic resin to shorten the retention time of sewage in a reactor, reduce the volume of the reactor and improve the removal effect of the nitrate nitrogen in the sewage.
Disclosure of Invention
1. Problems to be solved
In order to solve the problems in the prior art, the invention provides a method for removing nitrate nitrogen in water by promoting denitrification through magnetic resin, which forms a set of complete flow and system for removing nitrate nitrogen in water by promoting denitrification through primary magnetic resin adsorption treatment, secondary magnetic resin adsorption treatment, tertiary magnetic resin adsorption treatment and subsequent cyclone separation treatment and denitrification treatment, and has the characteristics of shortening the retention time of sewage in a reactor, reducing the volume of the reactor and improving the removal effect of nitrate nitrogen in sewage by using control parameters of gradient temperature control and gradient treatment time control.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention provides a method for removing nitrate nitrogen in water by promoting denitrification through magnetic resin, which comprises the steps of sequentially carrying out multistage magnetic resin adsorption treatment, cyclone separation treatment and denitrification treatment on sewage; the multistage magnetic resin adsorption treatment comprises a first-stage magnetic resin adsorption treatment, a second-stage magnetic resin adsorption treatment and a third-stage magnetic resin adsorption treatment which are sequentially carried out;
wherein: the temperature of a treatment pool for the first-stage magnetic resin adsorption treatment is 25-35 ℃, and the treatment time is 1.5-2.5 h;
the temperature of a treatment pool for the secondary magnetic resin adsorption treatment is 30-40 ℃, and the treatment time is 1-1.5 h; and
the temperature of the treatment pool for the three-stage magnetic resin adsorption treatment is 35-45 ℃, and the treatment time is 0.5-1 h.
Preferably, the magnetic resin used in the multistage magnetic resin adsorption treatment is NDM-2 magnetic anion exchange microsphere resin.
Preferably, aeration pipes are arranged in the treatment tanks of the multistage magnetic resin adsorption treatment.
Preferably, the denitrification treatment specifically comprises adding an electron donor into a denitrification reaction tank;
the treatment temperature of the denitrification treatment is 25-35 ℃, and the hydraulic retention time is 1-1.5 h.
Preferably, the resin addition amount of the first-order magnetic resin adsorption treatment is M1The addition amount of the resin for the second-stage magnetic resin adsorption treatment is M2Then M is1＜M2。
Preferably, the resin addition amount of the secondary magnetic resin adsorption treatment is M2The addition amount of the resin subjected to the three-stage magnetic resin adsorption treatment is M3Then M is2＜M3。
Preferably, the magnetic resin is synthesized by reacting y-Fe2O3Mixing with methyl acrylate, divinylbenzene, coupling agent and the like in a three-neck flask, adding a water phase, preparing the magnetic anion exchange microsphere resin selective to nitrate nitrogen by a suspension polymerization method, performing amination and alkylation to obtain a finished product of NDM-2 magnetic anion exchange microsphere resin, washing with methanol and distilled water for multiple times, and drying for later use.
Preferably, the electron donor is one or more of methanol, sodium acetate, glucose, starch, lactic acid, lactate, sulfur, ferrous salt and ferrous sulfide.
Preferably, one or more of activated sludge, denitrifying bacteria agent or anaerobic sludge is added into a denitrification reaction tank in the denitrification treatment.
Preferably, the method further comprises the step of recycling the resin, wherein the specific steps of recycling the resin are as follows: and discharging the resin at the bottom of the denitrification reaction tank back to the treatment tank subjected to the primary magnetic resin adsorption treatment in a natural sedimentation mode for recycling.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, a set of complete flow and system for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin is formed through primary magnetic resin adsorption treatment, secondary magnetic resin adsorption treatment, tertiary magnetic resin adsorption treatment and subsequent cyclone separation treatment and denitrification treatment, and the control parameters of gradient temperature control and gradient treatment time control are used for further improving the treatment effect of nitrate nitrogen.
(2) The invention discloses a method for removing nitrate nitrogen in water by promoting denitrification through magnetic resin, which comprises the steps of contacting and mixing NDM-2 magnetic anion exchange microsphere resin or MIEX magnetic anion exchange resin with sewage, carrying out ion exchange and denitrification dual actions on the NDM-2 magnetic anion exchange microsphere resin or MIEX magnetic anion exchange resin and the nitrate nitrogen in the sewage, realizing rapid and efficient removal of the nitrate nitrogen in the sewage, and simultaneously realizing reutilization of the NDM-2 magnetic anion exchange microsphere resin or MIEX magnetic anion exchange resin through microbial denitrification.
(3) According to the invention, through multi-stage magnetic resin adsorption treatment, simultaneous combination of one-stage treatment and two-stage synchronous adsorption treatment can be realized, the adsorption treatment time of each stage of magnetic resin is reduced, the adsorption treatment effect of each stage of magnetic resin is ensured, the subsequent process is prevented from being influenced, the accuracy of data is further ensured, and the reliability and effectiveness of the process for removing nitrate nitrogen in water are further verified. Moreover, the multistage treatment is carried out only by ensuring the addition amount of the resin, the feeding amount control is not required to be strictly carried out, and the development cost of the feeding amount control model is reduced.
Drawings
FIG. 1 is a flow chart of a process for removing nitrate nitrogen in water by magnetic resin enhanced denitrification.
Detailed Description
The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration exemplary embodiments in which the invention may be practiced, and in which features of the invention are identified by reference numerals. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is presented for purposes of illustration only and not limitation to describe the features and characteristics of the invention, to set forth the best mode of carrying out the invention, and to sufficiently enable one skilled in the art to practice the invention. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides a method for removing nitrate nitrogen in water by promoting denitrification through magnetic resin, which comprises the steps of sequentially carrying out multistage magnetic resin adsorption treatment, cyclone separation treatment and denitrification treatment on sewage as shown in figure 1; the multistage magnetic resin adsorption treatment comprises a first-stage magnetic resin adsorption treatment, a second-stage magnetic resin adsorption treatment and a third-stage magnetic resin adsorption treatment which are sequentially carried out. Wherein:
the temperature of a treatment pool for the first-stage magnetic resin adsorption treatment is 25-35 ℃, and the treatment time is 1.5-2.5 h;
the temperature of a treatment pool for the secondary magnetic resin adsorption treatment is 30-40 ℃, and the treatment time is 1-1.5 h; in a preferred embodiment, the resin added amount of the first-order magnetic resin adsorption treatment is M1The addition amount of the resin for the second-stage magnetic resin adsorption treatment is M2Then M is1＜M2(ii) a And
the temperature of a treatment pool for the three-stage magnetic resin adsorption treatment is 35-45 ℃, and the treatment time is 0.5-1 h; in a further preferred embodiment, the resin added in the secondary magnetic resin adsorption treatment is M2The addition amount of the resin subjected to the three-stage magnetic resin adsorption treatment is M3Then M is2＜M3Or further, M1＜M2＜M3. Further, the aeration pipes are arranged in the treatment tanks for the multistage magnetic resin adsorption treatment, and the aeration pipes are ensured to always run in the adsorption treatment process.
In a preferred embodiment of the present invention, the magnetic resin used in the multistage magnetic resin adsorption treatment is at least one of NDM-2 magnetic anion exchange microsphere resin or MIEX magnetic anion exchange resin. Further preferably NDM-2 magnetic anion exchange microsphere resin, the anion group of which has a long alkyl chain structure of triethylamine and is more hydrophobic and tends to absorb water energy than sulfurNitrate radical with small acid radical. NDM-2 magnetic anion exchange microsphere resin is used for being in contact with and mixed with sewage, and the NDM-2 magnetic anion exchange microsphere resin and nitrate nitrogen in the sewage have double effects of ion exchange and denitrification, so that the nitrate nitrogen in the sewage can be quickly and efficiently removed. Further, the invention provides a synthetic method of magnetic resin, which is prepared by mixing y-Fe2O3Mixing with methyl acrylate, divinylbenzene, coupling agent and the like in a three-neck flask, adding a water phase, preparing the magnetic anion exchange microsphere resin selective to nitrate nitrogen by a suspension polymerization method, performing amination and alkylation to obtain a finished product of NDM-2 magnetic anion exchange microsphere resin, washing with methanol and distilled water for multiple times, and drying for later use.
In the invention, the denitrification treatment specifically comprises adding an electron donor into a denitrification reaction tank, wherein the treatment temperature of the denitrification treatment is 25-35 ℃, and the hydraulic retention time is 1-1.5 h. The electron donor is one or more of methanol, sodium acetate, glucose, starch, lactic acid, lactate, sulfur, ferrous salt and ferrous sulfide. One or more of activated sludge, denitrifying bacteria agent or anaerobic sludge is added into a denitrification reaction tank in the denitrification treatment.
The invention also comprises a resin recycling process, and the specific steps of resin recycling are as follows: the resin at the bottom of the denitrification reaction tank is discharged back to the treatment tank for the first-level magnetic resin adsorption treatment in a natural sedimentation mode for recycling, so that the water treatment cost is reduced.
The invention is further described with reference to specific examples.
Example 1
In this embodiment, the specific steps of sewage treatment are as follows:
s100, firstly putting 1/3 NDM-2 magnetic anion exchange microsphere resin with fixed tank capacity into a primary magnetic resin adsorption treatment tank, then putting water containing nitrate nitrogen into the primary magnetic resin adsorption treatment tank, controlling the internal temperature of the primary magnetic resin adsorption treatment tank to be 25 ℃, controlling the adsorption treatment time of the nitrate nitrogen in the water to be 2 hours, arranging an aerator pipe at the bottom of the primary magnetic resin adsorption treatment tank, and ensuring that the aerator pipe runs all the time in the adsorption treatment process;
s200, discharging nitrate nitrogen-containing water in the primary magnetic resin adsorption treatment tank into a secondary magnetic resin adsorption treatment tank (filled with 1/2-tank-capacity magnetic resin), controlling the internal temperature of the secondary magnetic resin adsorption treatment tank to be 35 ℃, controlling the adsorption treatment time of nitrate nitrogen in water to be 1h, arranging an aerator pipe at the bottom of the secondary magnetic resin adsorption treatment tank, and ensuring that the aerator pipe runs all the time in the adsorption treatment process;
s300, discharging nitrate nitrogen-containing water in the second-stage magnetic resin adsorption treatment tank into a third-stage magnetic resin adsorption treatment tank (the filling volume of magnetic resin is 17% higher than that of the second-stage magnetic resin adsorption treatment tank), controlling the internal temperature of the third-stage magnetic resin adsorption treatment tank to be 45 ℃, controlling the adsorption treatment time of nitrate nitrogen in water to be 30min, arranging an aerator pipe at the bottom of the third-stage magnetic resin adsorption treatment tank, and ensuring that the aerator pipe always runs in the adsorption treatment process;
s400, discharging nitrate-containing nitrogen water in the three-stage magnetic resin adsorption treatment tank into a cyclone separator, and feeding the separated NDM-2 magnetic anion exchange microsphere resin into a denitrification reaction tank;
s500, adding an electron donor into a denitrification reaction tank, wherein the electron donor is methanol and sodium acetate, activated sludge is added into the denitrification reaction tank, the NDM-2 magnetic anion exchange microsphere resin stays in the denitrification reaction tank for 1h, and the temperature is maintained at 25-35 ℃;
s600, discharging the NDM-2 magnetic anion exchange microsphere resin at the bottom of the denitrification reaction tank back to the primary magnetic resin adsorption treatment tank in a natural sedimentation mode for recycling, contacting and mixing sewage through the NDM-2 magnetic anion exchange microsphere resin, and finally discharging the nitrate nitrogen from the device to water, wherein the removal rate of nitrate nitrogen reaches 96 +/-3%.
Example 2
The basic contents of this example are the same as example 1, except that an electron donor (glucose or starch) is added to the denitrification reactor, and a denitrifying bacteria agent (BioPower 100PLUS autotrophic nitrifying bacteria, available from national corporation of Hubei water) is added to the denitrification reactor. Through detection, the nitrate nitrogen removal rate of the final device in water reaches 93 +/-5%.
Example 3
The basic content of this example is the same as example 1, except that in this example, an electron donor, which is lactic acid or lactate, is added to the denitrification reactor, and anaerobic sludge is added to the denitrification reactor. Through detection, the nitrate nitrogen removal rate of the final device in water reaches 91 +/-3%.
Example 4
The basic content of this example is the same as example 1, except that in this example, an electron donor is added to the denitrification reaction tank, the electron donor is sulfur or ferrous salt, and anaerobic sludge is added to the denitrification reaction tank. Through detection, the nitrate nitrogen removal rate of the final device in water reaches 94 +/-2%.
Example 5
The basic content of this example is the same as example 1, except that in this example, an electron donor is added to the denitrification reaction tank, the electron donor is ferrous sulfide, and the denitrification reaction tank is added with a denitrifying bacteria agent and anaerobic sludge. Through detection, the nitrate nitrogen removal rate of the final device in water reaches 95 +/-2%.
Example 6
The basic content of this example is the same as example 1, except that the resin used in this example is a MIEX magnetic anion exchange resin. Meanwhile, in the embodiment, an electron donor is added into the denitrification reaction tank, wherein the electron donor is methanol or sodium acetate, and a denitrifying bacteria agent is added into the denitrification reaction tank. Through detection, the nitrate nitrogen removal rate of the final device in water reaches 92 +/-3%.
Example 7
The basic content of this example is the same as example 6, except that in this example, an electron donor, which is ferrous sulfide, is added to the denitrification reaction tank, and anaerobic sludge is added to the denitrification reaction tank. Through detection, the nitrate nitrogen removal rate of the final device in water reaches 92 +/-3%.
Example 8
The basic contents of this example are the same as example 6, except that in this example, an electron donor, which is glucose or starch, is added to the denitrification reaction tank, and activated sludge is added to the denitrification reaction tank. Through detection, the nitrate nitrogen removal rate of the final device in water reaches 94 +/-3%.
Example 9
The basic contents of this example are the same as example 6, except that in this example, an electron donor, which is sulfur or a ferrous salt, is added to the denitrification reaction tank, and activated sludge is added to the denitrification reaction tank. Through detection, the nitrate nitrogen removal rate of the final device in water reaches 93 +/-4%.
Example 10
The basic contents of this example are the same as example 6, except that in this example, an electron donor, which is methanol or sodium acetate, is added to the denitrification reaction tank, and a denitrifying bacteria agent and anaerobic sludge are added to the denitrification reaction tank. Through detection, the nitrate nitrogen removal rate of the final device in water reaches 92 +/-3%.
Example 11
The basic content of this embodiment is different from that of embodiment 1 in that:
the temperature of a treatment pool for the first-stage magnetic resin adsorption treatment is 25 ℃, and the treatment time is 1.5 h;
the temperature of a treatment pool for the secondary magnetic resin adsorption treatment is 30 ℃, and the treatment time is 1 h; and
the temperature of the treatment pool for the three-stage magnetic resin adsorption treatment is 35 ℃, and the treatment time is 0.5 h.
Through detection, the removal rate of nitrate nitrogen in the water discharged from the final device is basically the same as that in the example 1.
Example 12
The basic content of this embodiment is different from that of embodiment 1 in that:
the temperature of a treatment pool for the first-stage magnetic resin adsorption treatment is 35 ℃, and the treatment time is 2.5 h;
the temperature of a treatment pool for the secondary magnetic resin adsorption treatment is 40 ℃, and the treatment time is 1.5 h; and
the temperature of a treatment pool for the three-stage magnetic resin adsorption treatment is 45 ℃, and the treatment time is 1 h.
Through detection, the removal rate of nitrate nitrogen in the water discharged from the final device is basically the same as that in the example 1.
Comparative example 1
The basic content of this comparative example is the same as example 1, except that in this example:
the temperature of a treatment pool for the primary magnetic resin adsorption treatment is 35 ℃, and the treatment time is 1 h;
the temperature of a treatment pool for the secondary magnetic resin adsorption treatment is 35 ℃, and the treatment time is 1 h; and
the temperature of a treatment pool for the three-stage magnetic resin adsorption treatment is 35 ℃, and the treatment time is 1 h.
Through detection, the nitrate nitrogen removal rate of the final device effluent is 92 +/-3%.
More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, combined, e.g., between various embodiments, adapted and/or substituted, as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control. When a quality, concentration, temperature, time, or other value or parameter is expressed as a range, preferred range, or as a range defined by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, a range of 1 to 50 should be understood to include any number, combination of numbers, or subrange selected from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50, and all fractional values between the above integers, e.g., 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, and 1.9. With respect to sub-ranges, specifically consider "nested sub-ranges" that extend from any endpoint within the range. For example, nested sub-ranges of exemplary ranges 1-50 may include 1-10, 1-20, 1-30, and 1-40 in one direction, or 50-40, 50-30, 50-20, and 50-10 in another direction.
Claims (10)
1. A method for removing nitrate nitrogen in water by promoting denitrification with magnetic resin is characterized by comprising the steps of sequentially carrying out multistage magnetic resin adsorption treatment, cyclone separation treatment and denitrification treatment on sewage; the multistage magnetic resin adsorption treatment comprises a first-stage magnetic resin adsorption treatment, a second-stage magnetic resin adsorption treatment and a third-stage magnetic resin adsorption treatment which are sequentially carried out;
wherein: the temperature of the treatment pool for the primary magnetic resin adsorption treatment is 25-35 ℃, and the treatment time is 1.5-2.5 h;
the temperature of the treatment pool for the secondary magnetic resin adsorption treatment is 30-40 ℃, and the treatment time is 1-1.5 h; and
the temperature of the treatment pool for the three-stage magnetic resin adsorption treatment is 35-45 ℃, and the treatment time is 0.5-1 h.
2. The method for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin as claimed in claim 1, wherein: the magnetic resin used in the multistage magnetic resin adsorption treatment is at least one of NDM-2 magnetic anion exchange microsphere resin or MIEX magnetic anion exchange resin.
3. The method for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin as claimed in claim 1, wherein: aeration pipes are arranged in the treatment tanks for the multistage magnetic resin adsorption treatment.
4. The method for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin as claimed in claim 1, wherein: the denitrification treatment specifically comprises the steps of adding an electron donor into a denitrification reaction tank;
the treatment temperature of the denitrification treatment is 25-35 ℃, and the hydraulic retention time is 1-1.5 h.
5. The method for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin as claimed in claim 1, wherein: the addition of the resin subjected to the primary magnetic resin adsorption treatment is M1The addition amount of the resin for the secondary magnetic resin adsorption treatment is M2Then M is1＜M2。
6. The method for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin as claimed in claim 1 or 5, wherein: the addition of the resin subjected to the secondary magnetic resin adsorption treatment is M2The addition of the resin subjected to the three-stage magnetic resin adsorption treatment is M3Then M is2＜M3。
7. The method for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin as claimed in claim 2, wherein: the synthesis method of the magnetic resin comprises the following steps of mixing y-Fe2O3Mixing with methyl acrylate, divinylbenzene, coupling agent, etc. in a three-neck flask, adding water phase, and suspension polymerization to obtain the magnetic anion exchange microsphere with selectivity to nitrate nitrogenAnd (3) carrying out amination and alkylation on the resin to obtain a finished product of NDM-2 magnetic anion exchange microsphere resin, washing the resin for multiple times by using methanol and distilled water, and drying the resin for later use.
8. The method for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin as claimed in claim 4, wherein: the electron donor is one or more of methanol, sodium acetate, glucose, starch, lactic acid, lactate, sulfur, ferrous salt and ferrous sulfide.
9. The method for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin as claimed in claim 4, wherein: one or more of activated sludge, denitrifying bacteria agent or anaerobic sludge is added into a denitrification reaction tank in the denitrification treatment.
10. The method for promoting denitrification to remove nitrate nitrogen in water by using magnetic resin as claimed in any one of claims 1-9, further comprising the step of recycling the resin, wherein the specific steps of recycling the resin are as follows: and discharging the resin at the bottom of the denitrification reaction tank back to the treatment tank subjected to the primary magnetic resin adsorption treatment in a natural sedimentation mode for recycling.
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| CN102430433A (en) * | 2011-10-25 | 2012-05-02 | 南京大学 | Magnetic microsphere resin for removing nitrate nitrogen selectively, and preparation method thereof |
| CN107445249A (en) * | 2017-09-04 | 2017-12-08 | 南京大学盐城环保技术与工程研究院 | A kind of two-stage resin strengthens mutually the method for removing useless Organic substance in water and nitrate nitrogen |
| CN107651815A (en) * | 2017-11-17 | 2018-02-02 | 南京大学 | A kind of magnetic resin promotes the method that denitrification removes nitrate nitrogen in water removal |
| US20200338523A1 (en) * | 2017-11-17 | 2020-10-29 | Nanjing University | Magnetic strong base anion exchange resin with high mechanical strength, and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430433A (en) * | 2011-10-25 | 2012-05-02 | 南京大学 | Magnetic microsphere resin for removing nitrate nitrogen selectively, and preparation method thereof |
| CN107445249A (en) * | 2017-09-04 | 2017-12-08 | 南京大学盐城环保技术与工程研究院 | A kind of two-stage resin strengthens mutually the method for removing useless Organic substance in water and nitrate nitrogen |
| CN107651815A (en) * | 2017-11-17 | 2018-02-02 | 南京大学 | A kind of magnetic resin promotes the method that denitrification removes nitrate nitrogen in water removal |
| US20200338523A1 (en) * | 2017-11-17 | 2020-10-29 | Nanjing University | Magnetic strong base anion exchange resin with high mechanical strength, and preparation method thereof |
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