CN110835204A - Method for degrading ammonia nitrogen in wastewater - Google Patents
Method for degrading ammonia nitrogen in wastewater Download PDFInfo
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- CN110835204A CN110835204A CN201911084060.5A CN201911084060A CN110835204A CN 110835204 A CN110835204 A CN 110835204A CN 201911084060 A CN201911084060 A CN 201911084060A CN 110835204 A CN110835204 A CN 110835204A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a method for degrading ammonia nitrogen in wastewater, which comprises the following steps of sampling the wastewater and detecting the initial concentration of the ammonia nitrogen in the wastewater; sequentially adding magnesium salt and phosphate into the wastewater, filtering the generated precipitate, and taking supernatant; adjusting the pH of the supernatant; adding a microbial agent and a carbon source into the supernatant, and culturing; and detecting the concentration of ammonia nitrogen in the supernatant. According to the method for degrading the ammonia nitrogen in the wastewater, provided by the invention, a chemical method and a microbiological method are combined for degrading the ammonia nitrogen in the wastewater, firstly, magnesium salt and phosphate which are chemical reagents are sequentially added into the wastewater, precipitates are filtered, the ammonia nitrogen degradation rate of the wastewater is about 50%, and then, a microbial agent and a carbon source are added into the supernatant for cultivation, so that the ammonia nitrogen degradation rate of the wastewater reaches over 75%.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a method for degrading ammonia nitrogen in wastewater.
Background
The problem of water pollution caused by ammonia nitrogen discharge has attracted wide attention at home and abroad. The increase of the content of ammonia nitrogen in the wastewater can bring high oxygen consumption, cause water eutrophication, form 'water bloom' and 'red tide', destroy the water environment, generate toxic action on aquatic organisms, and endanger the life safety of human beings eating polluted aquatic products by mistake. With the aggravation of water resource crisis and the deeper understanding of people on ammonia nitrogen wastewater, the comprehensive treatment of ammonia nitrogen wastewater by searching economic and efficient treatment technology becomes a problem to be solved urgently.
At present, the main methods for removing ammonia nitrogen comprise physical methods, chemical methods and biological methods. The physical method comprises treatment methods such as reverse osmosis, distillation, soil irrigation and the like; the chemical method comprises the treatment methods of ion exchange, ammonia stripping, breakpoint chlorination, incineration, chemical precipitation, catalytic cracking, electrodialysis, electrochemistry and the like; the biological method comprises treatment methods such as algae cultivation, biological nitrification, immobilized biotechnology and the like.
For high-concentration ammonia nitrogen wastewater (NH3-N >500mg/L), the traditional chemical method has the following defects: for example, the breakpoint chlorination process has high operation requirements and high cost, and can generate harmful gases; the ion exchange method has the advantages of large resin consumption, difficult regeneration and high cost; the ammonia stripping method has large energy consumption and secondary pollution. Direct use of biological principles may have inhibitory effects on microbial activity.
Therefore, it is necessary to provide a new method for degrading ammonia nitrogen in wastewater to solve the above problems.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The invention provides a method for degrading ammonia nitrogen in wastewater, which comprises the following steps:
sampling wastewater, and detecting the initial concentration of ammonia nitrogen in the wastewater;
sequentially adding magnesium salt and phosphate into the wastewater, filtering the generated precipitate, and taking supernatant;
adjusting the pH of the supernatant;
adding a microbial agent and a carbon source into the supernatant, and culturing;
and detecting the concentration of ammonia nitrogen in the supernatant.
Further, the step of sequentially adding magnesium salt and phosphate to the wastewater comprises:
adding the magnesium salt into the wastewater, and stirring for dissolving;
adjusting the pH value of the wastewater;
adding the phosphate to the wastewater and stirring to produce the precipitate.
Further, the magnesium salt comprises magnesium sulfate or magnesium chloride, and the ratio of the amount of magnesium ions in the magnesium salt to the amount of ammonia nitrogen in the wastewater is 1.3: 1-1.5: 1.
Further, the phosphate comprises disodium hydrogen phosphate or potassium dihydrogen phosphate, and the ratio of the amount of phosphate ions in the added phosphate to the amount of ammonia nitrogen in the wastewater is 0.8: 1-1.0: 1.
Further, the microbial agent comprises heterotrophic nitrification-aerobic denitrification bacteria.
Further, the volume of the added microbial agent is 0.1-1% of the volume of the wastewater.
Further, the carbon source comprises sodium citrate or glucose.
Further, the mass ratio of the mass of the carbon atoms in the added carbon source to the mass of the nitrogen and ammonia in the supernatant is 5: 1-12: 1.
Further, the cultivation temperature is 25-35 ℃, and the cultivation time is 3-6 days.
Further, when the concentration of ammonia nitrogen in the supernatant is higher than a threshold value, adding a microbial agent into the supernatant again, wherein the volume of the added microbial agent is 0.01-0.1% of the volume of the wastewater.
According to the method for degrading the ammonia nitrogen in the wastewater, provided by the invention, a chemical method and a microbiological method are combined for degrading the ammonia nitrogen in the wastewater, firstly, magnesium salt and phosphate which are chemical reagents are sequentially added into the wastewater, precipitates are filtered, the ammonia nitrogen degradation rate of the wastewater is about 50%, and then, a microbial agent and a carbon source are added into the supernatant for cultivation, so that the ammonia nitrogen degradation rate of the wastewater reaches over 75%.
Drawings
The following drawings of the invention are included to provide a further understanding of the invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles and apparatus of the invention. In the drawings, there is shown in the drawings,
FIG. 1 is a flow chart of the method for degrading ammonia nitrogen in wastewater according to the invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In order to provide a thorough understanding of the present invention, detailed steps and detailed structures will be set forth in the following description in order to explain the present invention. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
Aiming at the problem that when high-concentration ammonia nitrogen wastewater is treated (NH3-N is more than 500mg/L) in the prior art, the traditional chemical method has the defects that: for example, the breakpoint chlorination process has high operation requirements and high cost, and can generate harmful gases; the ion exchange method has the advantages of large resin consumption, difficult regeneration and high cost; the ammonia stripping method has large energy consumption and secondary pollution. Direct use of biological principles may have inhibitory effects on microbial activity. The invention provides a method for degrading ammonia nitrogen in wastewater, which comprises the following steps as shown in figure 1:
s101: sampling wastewater, and detecting the initial concentration of ammonia nitrogen in the wastewater;
s102: sequentially adding magnesium salt and phosphate into the wastewater, filtering the generated precipitate, and taking supernatant;
s103: adjusting the pH of the supernatant;
s104: adding a microbial agent and a carbon source into the supernatant, and culturing;
s105: and detecting the concentration of ammonia nitrogen in the supernatant.
First, step S101 is performed: sampling the wastewater, and detecting the initial concentration of ammonia nitrogen in the wastewater.
Illustratively, the wastewater includes actual wastewater, such as industrial wastewater or domestic wastewater, and may be collected from factories, sewage treatment plants, and the like. The wastewater can also comprise self-prepared simulated wastewater, and a solution with certain COD and ammonia nitrogen concentration is prepared by utilizing carbon sources such as glucose and the like and nitrogen sources such as ammonium sulfate and the like as the simulated wastewater, because the invention is used for treating the high-concentration ammonia nitrogen wastewater, the target ammonia nitrogen concentration (mass fraction) of the simulated wastewater is 500mg/L, in one embodiment, 1L of pure water is taken, and 2.5g of ammonium sulfate is added to prepare the simulated high-ammonia nitrogen wastewater.
Illustratively, the amount of waste water sampled may be selected and adjusted as desired. In one embodiment, approximately 250mL of wastewater is taken.
Illustratively, the detection of the initial concentration of ammonia nitrogen in the wastewater may be performed using any technique that can be used to detect the concentration of ammonia nitrogen in the solution. As an example, the initial ammonia nitrogen concentration of the wastewater is detected by using a Nashin reagent spectrophotometry (national environmental protection standard HJ 535-2009 of the people's republic of China: Nashin reagent spectrophotometry for measuring ammonia nitrogen in water). The principle of the nano-reagent spectrophotometry is as follows: the alkaline solution of mercuric iodide and potassium iodide reacts with ammonia to generate a light red brown colloidal compound, the chroma of the compound is in direct proportion to the content of ammonia nitrogen, the absorbance of the compound can be measured within the wavelength range of 410-425 nm, and the content of the compound can be calculated. In one embodiment, the initial concentration (mass fraction) of ammonia nitrogen in the wastewater is about 493 mg/L.
Next, step S102 is performed: and sequentially adding magnesium salt and phosphate into the wastewater, filtering the generated precipitate, and taking supernatant.
Wherein the step of sequentially adding magnesium salt and phosphate into the wastewater comprises:
s1021: adding the magnesium salt into the wastewater, and stirring for dissolving;
s1022: adjusting the pH value of the wastewater;
s1023: adding the phosphate to the wastewater and stirring to produce the precipitate.
Illustratively, the magnesium salt comprises magnesium sulfate or magnesium chloride, and the ratio of the amount of magnesium ions in the added magnesium salt to the amount of ammonia nitrogen in the wastewater is 1.3: 1-1.5: 1.
In one example, 3.26g of magnesium sulfate was added to the above 250mL of wastewater having an ammoniacal nitrogen concentration of about 493mg/L, followed by stirring to completely dissolve the added magnesium sulfate.
And then, adjusting the pH value of the wastewater to 9-11, preferably, adjusting the pH value of the wastewater to about 10 to make the solution alkaline.
In one embodiment, an alkaline solution including, but not limited to, NaOH solution having a concentration (mass fraction) of about 32% is added to the wastewater to adjust the pH.
Illustratively, the phosphate comprises disodium hydrogen phosphate or potassium dihydrogen phosphate, and the ratio of the amount of phosphate ions in the phosphate to the amount of ammonia nitrogen in the wastewater is 0.8: 1-1.0: 1.
In one example, 1.21g of disodium hydrogen phosphate was added to the 250mL of wastewater, stirred well and allowed to stand for a period of time to allow the resulting precipitate to settle.
Next, the method further includes step S1024: the resulting precipitate and supernatant were separated by filtration.
Illustratively, methods of filtration include, but are not limited to, standing, filter paper filtration, centrifugation, and the like.
Next, the method further includes step S1025: and detecting the concentration of ammonia nitrogen in the supernatant.
In one embodiment, the concentration of ammonia nitrogen in the supernatant is about 250mg/L by using a nano reagent spectrophotometry, so that the degradation rate of ammonia nitrogen is about 50%.
By adding chemical reagents such as magnesium salt, phosphate and the like into the wastewater, the degradation rate of ammonia nitrogen in the wastewater reaches about 50%, and generated precipitates comprise magnesium ions, ammonium ions and phosphate ions and can be used as a compound fertilizer, so that secondary pollution is avoided.
Next, step S103 is performed: adjusting the pH of the supernatant.
Illustratively, the pH value of the wastewater is adjusted to 6-8, and preferably, the pH value of the wastewater is adjusted to about 7, so that the solution is neutral.
In one embodiment, an acidic solution including, but not limited to, HCl solution is added to the wastewater to adjust the pH.
Next, step S104 is performed: and adding a microbial agent and a carbon source into the supernatant, and culturing.
Illustratively, the carbon source comprises sodium citrate or glucose, and the ratio of the mass of the carbon atoms in the added carbon source to the mass of the nitrogen and ammonia in the supernatant is 5: 1-12: 1. In one example, 2.15g of sodium citrate was added to the above supernatant.
Illustratively, the microbial agent includes heterotrophic nitrification-aerobic denitrification bacteria, and as an example, the heterotrophic nitrification-aerobic denitrification bacteria of the present invention are Raoultella raeana.
Illustratively, the volume of the microbial agent added is 0.1% to 1% of the volume of the wastewater, wherein the concentration of the microbial agent is bacterial cell density (OD)600) The value of (1) is 1 to 1.2.
In one embodiment, 250 μ L of microbial agent is added to the supernatant.
Illustratively, the temperature of the incubation is 25 ℃ to 35 ℃, and the incubation time is 3 days to 6 days.
Next, step S105 is performed: and detecting the concentration of ammonia nitrogen in the supernatant.
In one embodiment, the concentration of ammonia nitrogen in the supernatant is detected by using a nano-reagent spectrophotometry, and the ammonia nitrogen concentration and the ammonia nitrogen degradation rate of the sample after different incubation times are shown in table 1.
TABLE 1 Ammonia nitrogen concentration and degradation rate of ammonia nitrogen in samples after different incubation times
After the degradation rate of ammonia nitrogen in the wastewater reaches about 50% by a chemical method, the ammonia nitrogen in the wastewater is further degraded by a microbiological method, the degradation rate of the ammonia nitrogen can reach over 75% after 3 days of cultivation, the degradation rate of the ammonia nitrogen can reach over 80% after 6 days of cultivation, and the degradation rate of the ammonia nitrogen can reach about 90% after 8 days of cultivation. Compared with a single chemical method (the ammonia nitrogen degradation rate is 40-60%) or a single microbiological method (the ammonia nitrogen degradation rate is about 20-40%), the method combining the chemical method and the microbiological method can obviously improve the ammonia nitrogen degradation rate in the wastewater.
Illustratively, the treated wastewater may be discharged when the concentration of ammonia nitrogen in the supernatant is below a threshold value. The threshold value can be set according to relevant environmental standards existing in China, and the environmental standards include but are not limited to 'surface water environment quality standards' (GB3838-2002), 'underground water environment quality standards' (GB/T14848-93), 'comprehensive sewage discharge standards' (GB8978-1996) and the like.
Illustratively, when the concentration of ammonia nitrogen in the supernatant is higher than a threshold value, step S106 is performed: the microbial agent is again added to the supernatant.
Illustratively, the volume of the microbial agent added is 0.01% to 0.1% of the volume of the wastewater.
According to the method for degrading the ammonia nitrogen in the wastewater, provided by the invention, a chemical method and a microbiological method are combined for degrading the ammonia nitrogen in the wastewater, firstly, magnesium salt and phosphate which are chemical reagents are sequentially added into the wastewater, precipitates are filtered, the ammonia nitrogen degradation rate of the wastewater is about 50%, and then, a microbial agent and a carbon source are added into the supernatant for cultivation, so that the ammonia nitrogen degradation rate of the wastewater reaches over 75%.
The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A method for degrading ammonia nitrogen in wastewater is characterized by comprising the following steps:
sampling wastewater, and detecting the initial concentration of ammonia nitrogen in the wastewater;
sequentially adding magnesium salt and phosphate into the wastewater, filtering the generated precipitate, and taking supernatant;
adjusting the pH of the supernatant;
adding a microbial agent and a carbon source into the supernatant, and culturing;
and detecting the concentration of ammonia nitrogen in the supernatant.
2. The method of degrading ammonia nitrogen in wastewater according to claim 1, wherein the step of adding magnesium salts and phosphate salts to the wastewater sequentially comprises:
adding the magnesium salt into the wastewater, and stirring for dissolving;
adjusting the pH value of the wastewater;
adding the phosphate to the wastewater and stirring to produce the precipitate.
3. The method for degrading ammonia nitrogen in wastewater according to claim 1, wherein the magnesium salt comprises magnesium sulfate or magnesium chloride, and the ratio of the amount of magnesium ions in the magnesium salt to the amount of ammonia nitrogen in the wastewater is 1.3: 1-1.5: 1.
4. The method for degrading ammonia nitrogen in wastewater according to claim 1, wherein the phosphate comprises disodium hydrogen phosphate or potassium dihydrogen phosphate, and the ratio of the amount of phosphate ions in the phosphate to the amount of ammonia nitrogen in the wastewater is 0.8:1 to 1.0: 1.
5. The method for degrading ammonia nitrogen in wastewater according to claim 1, wherein the microbial agent comprises heterotrophic nitrification-aerobic denitrification bacteria.
6. The method for degrading ammonia nitrogen in wastewater according to claim 1, wherein the volume of the added microbial agent is 0.1-1% of the volume of the wastewater.
7. The method for degrading ammonia nitrogen in wastewater according to claim 1, wherein the carbon source comprises sodium citrate or glucose.
8. The method for degrading ammonia nitrogen in wastewater according to claim 7, wherein the mass ratio of carbon atoms in the added carbon source to nitrogen ammonia in the supernatant is 5: 1-12: 1.
9. The method for degrading ammonia nitrogen in wastewater according to claim 1, wherein the temperature of the cultivation is 25 ℃ to 35 ℃, and the cultivation time is 3 days to 6 days.
10. The method for degrading ammonia nitrogen in wastewater according to claim 1, wherein when the concentration of ammonia nitrogen in the supernatant is higher than a threshold value, a microbial agent is added to the supernatant again, and the volume of the added microbial agent is 0.01-0.1% of the volume of the wastewater.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113604407A (en) * | 2021-09-03 | 2021-11-05 | 中冶华天南京工程技术有限公司 | Composite microbial algaecide and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5294348A (en) * | 1990-11-26 | 1994-03-15 | Societe Nationale Elf Aquitaine | Process for removing ammonia from waste waters |
| CN103508618A (en) * | 2012-06-27 | 2014-01-15 | 中国石油化工股份有限公司 | Method for treating high-concentration ammonia nitrogen wastewater |
| CN107244742A (en) * | 2017-05-10 | 2017-10-13 | 上田环境修复股份有限公司 | A kind of method of the microbial degradation of pollutant in trade effluent |
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2019
- 2019-11-07 CN CN201911084060.5A patent/CN110835204A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5294348A (en) * | 1990-11-26 | 1994-03-15 | Societe Nationale Elf Aquitaine | Process for removing ammonia from waste waters |
| CN103508618A (en) * | 2012-06-27 | 2014-01-15 | 中国石油化工股份有限公司 | Method for treating high-concentration ammonia nitrogen wastewater |
| CN107244742A (en) * | 2017-05-10 | 2017-10-13 | 上田环境修复股份有限公司 | A kind of method of the microbial degradation of pollutant in trade effluent |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113604407A (en) * | 2021-09-03 | 2021-11-05 | 中冶华天南京工程技术有限公司 | Composite microbial algaecide and preparation method and application thereof |
| CN113604407B (en) * | 2021-09-03 | 2024-02-06 | 中冶华天南京工程技术有限公司 | Composite microbial algicidal fungicide and preparation method and application thereof |
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Application publication date: 20200225 |