CN114605017A - Treatment process of ammonia nitrogen wastewater - Google Patents
Treatment process of ammonia nitrogen wastewater Download PDFInfo
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- CN114605017A CN114605017A CN202011414279.XA CN202011414279A CN114605017A CN 114605017 A CN114605017 A CN 114605017A CN 202011414279 A CN202011414279 A CN 202011414279A CN 114605017 A CN114605017 A CN 114605017A
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/06—Flash evaporation
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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
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
Abstract
The invention discloses a treatment process of ammonia nitrogen wastewater, which is characterized by comprising the following steps: adjusting the pH value of the ammonia nitrogen wastewater to be alkaline, performing flocculation and sedimentation to obtain supernatant and thick liquid, treating the thick liquid by adopting a filter pressing washing process to obtain filtrate and filter residues, and combining the supernatant and the filtrate to obtain mixed liquid; filtering the mixed solution by a fiber filter to obtain filtrate; the filtered liquid falls to the bottom of the ultrasonic flash tower from the top of the ultrasonic flash tower in a spraying mode, an ultrasonic device arranged at the bottom of the ultrasonic flash tower carries out ultrasonic treatment on the pretreatment liquid at the bottom of the ultrasonic flash tower, and ammonia gas continuously generated in the tower is led out and collected through an air outlet pipe; returning the pretreatment liquid at the bottom of the tower to the top of the tower through a circulating pipeline for spraying, and circularly operating for 5-10 h; adding magnesium salt and phosphate into the ammonia nitrogen wastewater subjected to flash evaporation treatment for precipitation reaction, and performing solid-liquid separation after stirring to finish the treatment of the ammonia nitrogen wastewater. The process has low investment cost and can efficiently treat the high-concentration ammonia nitrogen wastewater.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment process of ammonia nitrogen wastewater.
Background
Fertilizers, smelting, coking, petrifaction, pharmacy, foods, refuse landfills and the like all generate a large amount of high-concentration ammonia nitrogen wastewater. The discharge of a large amount of ammonia nitrogen wastewater into the water body not only causes eutrophication of the water body and causes black and odorous water body, but also increases the difficulty and cost of water supply treatment and even has toxin effect on people and organisms. With the rapid development of chemical fertilizer, petrochemical industry and other industries, the generated high ammonia nitrogen wastewater also becomes one of the industry development restriction factors. The red tide and ammonia nitrogen in the sea area of China are one of the important causes of pollution, in particular to the pollution caused by high-concentration ammonia nitrogen wastewater. Therefore, the economic and effective control of high concentration pollution is also an important subject of current research by environmental protection workers, and is highly regarded by the industry. The general formation of ammonia nitrogen wastewater is caused by the coexistence of ammonia water and inorganic ammonia, generally, the main source of ammonia nitrogen in wastewater with pH above neutral is the combined action of inorganic ammonia and ammonia water, and the ammonia nitrogen in wastewater under the acidic condition of pH is mainly caused by inorganic ammonia. The ammonia nitrogen in the wastewater mainly comprises two ammonia nitrogen components, wherein one is formed by ammonia water, and the other is formed by inorganic ammonia, and the other is mainly ammonium sulfate, ammonium chloride and the like. The commonly used ammonia nitrogen wastewater treatment methods mainly comprise a biochemical method, a breakpoint chlorination method, a zeolite adsorption method, a chemical precipitation method, an ammonia evaporation method, a stripping method and the like. The methods have obvious treatment effect on the medium-low concentration ammonia nitrogen wastewater, but cannot meet the treatment requirement of the high concentration ammonia nitrogen wastewater due to the limitation of technology and cost. At present, the combined process of air stripping and biochemical method is usually adopted for high-concentration ammonia nitrogen wastewater with the content of more than or equal to 5g/L in the industry, but the method has high treatment cost, and the stripped ammonia gas is directly discharged into the atmosphere, thereby causing secondary pollution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a treatment process of high-concentration ammonia nitrogen wastewater with low investment cost.
In order to solve the technical problem, the invention adopts the following technical scheme:
the treatment process of the ammonia nitrogen wastewater is characterized by comprising the following steps:
s1: adjusting the pH value of the ammonia nitrogen wastewater to be alkaline, performing flocculation and sedimentation in a reaction sedimentation tank to obtain supernatant and thick liquid, treating the thick liquid by adopting a filter pressing and washing process to obtain filtrate and filter residues, and combining the supernatant and the filtrate to obtain mixed liquid;
s2: filtering the mixed solution by a fiber filter to obtain filtrate;
s3: the filtered liquid falls to the bottom of the ultrasonic flash tower from the top of the ultrasonic flash tower in a spraying mode, an ultrasonic device arranged at the bottom of the ultrasonic flash tower carries out ultrasonic treatment on the pretreatment liquid at the bottom of the ultrasonic flash tower, and ammonia gas continuously generated in the tower is led out and collected through an air outlet pipe; returning the pretreatment liquid at the bottom of the tower to the top of the tower through a circulating pipeline for spraying, and circularly operating for 5-10 h;
s4: adding magnesium salt and phosphate into the ammonia nitrogen wastewater subjected to flash evaporation treatment for precipitation reaction, and performing solid-liquid separation after stirring to finish the treatment of the ammonia nitrogen wastewater.
Further, the pH value of the ammonia nitrogen wastewater is adjusted to 9-11.
Further, the pH regulator is one or more of sodium hydroxide, calcium hydroxide, sodium carbonate and sodium bicarbonate.
Further, the temperature of the precipitation reaction is 25-35 ℃, and the time of the precipitation reaction is 20-40 min.
Further, the magnesium salt is magnesium chloride, and the phosphate salt is sodium dihydrogen phosphate.
Further, the molar ratio of Mg in magnesium salt, N in ammonia nitrogen wastewater and P in phosphate is 0.8-0.9: 1: 1.1-1.2.
Further, a flat membrane separator is adopted for solid-liquid separation, and an aerator is arranged at the bottom of the flat membrane separator.
Further, the flash evaporation treatment temperature of the filtrate is 60-80 ℃.
Further, the ammonia nitrogen concentration of the ammonia nitrogen wastewater is more than or equal to 5 g/L.
Compared with the prior art, the invention has the advantages that:
the method firstly adjusts the pH value of the ammonia nitrogen wastewater to be alkaline, so that ammonium ions in the ammonia nitrogen wastewater are easily converted into ammonia monohydrate, and then carries out flocculation sedimentation and a fiber filter on the obtained adjusting solution in sequence to remove suspended matters, heavy metal impurities and the like in the ammonia nitrogen wastewater, so as to reduce the influence of the heavy metal ions and the like on chemical precipitation and improve the purity of the ammonia nitrogen. Then evaporating free NH in the ammonia nitrogen wastewater by flash evaporation treatment3Greatly reducing the dosage of the subsequent chemical precipitation medicament. And by combiningThe ultrasonic technology greatly reduces the temperature of the wastewater required by the flash evaporation process, thereby greatly reducing the energy consumption, and the ultrasonic energy accelerates the free NH3The ammonia gas escapes from the solution in the form of ammonia gas, thereby improving the removal rate of ammonia nitrogen. The equipment for treating the ammonia nitrogen wastewater has the advantages of simple structure, low investment and operation cost and high ammonia nitrogen removal efficiency.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the present invention will be clearly and completely described below in conjunction with specific preferred embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the treatment process of the ammonia nitrogen wastewater is characterized by comprising the following steps:
s1: the pH value of the smelting ammonia nitrogen wastewater with the ammonia nitrogen concentration of 120g/L is adjusted to about 9 by using a sodium hydroxide solution, so that ammonium ions in the ammonia nitrogen wastewater are easily converted into ammonium monohydrate, more ammonia nitrogen in the ammonia nitrogen wastewater can be formed into ammonia gas in the subsequent flash evaporation treatment, and the evaporated concentrated solution can meet the discharge standard.
S2: and (2) flocculating and settling the ammonia nitrogen wastewater with the pH value adjusted by a reaction sedimentation tank to obtain supernatant and thick liquid, treating the thick liquid by adopting a filter pressing washing process to obtain filtrate and filter residues, and combining the supernatant and the filtrate to obtain mixed liquid.
Solid-liquid separation is carried out on the ammonia nitrogen wastewater with the pH value adjusted, so that suspended solids in the ammonia nitrogen wastewater can be removed, the impurities are prevented from scaling in subsequent flash evaporation equipment, the ammonia nitrogen purity in the regulating solution can be improved by removing the impurities, and the evaporation efficiency of the ammonia nitrogen in the subsequent flash evaporation process is improved.
S3: and filtering the mixed solution by a fiber filter to obtain filtrate. Through carrying out the fiber filter to mixed liquid and filtering to get rid of impurity such as heavy metal in the ammonia nitrogen waste water, avoid heavy metal impurity to influence follow-up chemical precipitation effect.
S4: in order to evaporate more ammonia nitrogen in the filtrate to form ammonia gas, the filtrate is conveyed to a liquid storage tank with a heater for heating, and the filtrate is heated to 60 ℃.
S5: opening an ultrasonic device at the bottom of the ultrasonic flash tower, conveying the heated filtrate to an inlet at the top of the ultrasonic flash tower, enabling the filtrate to fall to the bottom of the ultrasonic flash tower from the top of the ultrasonic flash tower in a spraying manner, carrying out ultrasonic treatment on the filtrate at the bottom of the ultrasonic flash tower by using an ultrasonic device arranged at the bottom of the ultrasonic flash tower, and leading out and collecting ammonia gas continuously generated in the tower through an air outlet pipe; and returning the filtrate at the bottom of the tower to the top of the tower through a circulating pipeline for spraying, and circularly operating for 6 hours.
The ultrasonic energy effectively changes the complexed ammonia into free NH4+Accelerating free NH3The ammonia escapes from the solution in the form of ammonia, the flash evaporation efficiency is enhanced, and the removal rate of ammonia nitrogen is obviously improved. And, through combining the ultrasonic technology, greatly reduced the required waste water temperature of flash distillation process to greatly reduced the power consumption.
S6: adding magnesium chloride and sodium dihydrogen phosphate into the ammonia nitrogen wastewater subjected to flash evaporation treatment for precipitation reaction, wherein the molar ratio of Mg in magnesium salts, N in the ammonia nitrogen wastewater and P in phosphate is 0.8: 1: 1.2, precipitating for 30min at 30 ℃ after stirring, performing solid-liquid separation by a flat membrane separator, and detecting to reduce the ammonia nitrogen in the wastewater to 11.7Mg/L and ensure that the treatment of high-concentration ammonia nitrogen wastewater reaches the standard.
Example 2:
the method for treating ammonia nitrogen wastewater comprises the following steps:
s1: the pH value of the smelting ammonia nitrogen wastewater with the ammonia nitrogen concentration of 130.5g/L is adjusted to about 10 by using a sodium hydroxide solution.
S2: and (2) flocculating and settling the ammonia nitrogen wastewater with the pH value adjusted by a reaction sedimentation tank to obtain supernatant and thick liquid, treating the thick liquid by adopting a filter pressing washing process to obtain filtrate and filter residues, and combining the supernatant and the filtrate to obtain mixed liquid.
S3: and filtering the mixed solution by a fiber filter to obtain filtrate.
S4: and conveying the filtrate to a liquid storage tank with a heater for heating, and heating the filtrate to 70 ℃.
S5: opening an ultrasonic device at the bottom of the ultrasonic flash tower, conveying the heated filtrate to an inlet at the top of the ultrasonic flash tower, enabling the filtrate to fall to the bottom of the ultrasonic flash tower from the top of the ultrasonic flash tower in a spraying manner, carrying out ultrasonic treatment on the filtrate at the bottom of the ultrasonic flash tower by using an ultrasonic device arranged at the bottom of the ultrasonic flash tower, and leading out and collecting ammonia gas continuously generated in the tower through an air outlet pipe; and returning the filtrate at the bottom of the tower to the top of the tower through a circulating pipeline for spraying, and circularly operating for 10 hours.
S6: adding magnesium chloride and sodium dihydrogen phosphate into the ammonia nitrogen wastewater subjected to flash evaporation treatment for precipitation reaction, wherein the molar ratio of Mg in magnesium salts, N in the ammonia nitrogen wastewater and P in phosphate is 0.9: 1: 1.1, precipitating for 30min at 30 ℃ after stirring, performing solid-liquid separation by a flat membrane separator, and detecting to reduce the ammonia nitrogen in the wastewater to 14.5Mg/L and ensure that the treatment of high-concentration ammonia nitrogen wastewater reaches the standard.
Example 3:
the method for treating ammonia nitrogen wastewater comprises the following steps:
s1: the pH value of the smelting ammonia nitrogen wastewater with the ammonia nitrogen concentration of 90.5g/L is adjusted to about 10 by using a sodium hydroxide solution.
S2: and (2) flocculating and settling the ammonia nitrogen wastewater with the pH value adjusted by a reaction sedimentation tank to obtain supernatant and thick liquid, treating the thick liquid by adopting a filter pressing washing process to obtain filtrate and filter residues, and combining the supernatant and the filtrate to obtain mixed liquid.
S3: and filtering the mixed solution by a fiber filter to obtain filtrate.
S4: and (3) conveying the filtrate to a liquid storage tank with a heater for heating, and heating the filtrate to 75 ℃.
S5: opening an ultrasonic device at the bottom of the ultrasonic flash tower, conveying the heated filtrate to an inlet at the top of the ultrasonic flash tower, enabling the filtrate to fall to the bottom of the ultrasonic flash tower from the top of the ultrasonic flash tower in a spraying manner, carrying out ultrasonic treatment on the filtrate at the bottom of the ultrasonic flash tower by using an ultrasonic device arranged at the bottom of the ultrasonic flash tower, and leading out and collecting ammonia gas continuously generated in the tower through an air outlet pipe; the filtrate at the bottom of the tower returns to the top of the tower through a circulating pipeline for spraying, and the circulating operation is carried out for 8 hours.
S6: adding magnesium chloride and sodium dihydrogen phosphate into the ammonia nitrogen wastewater subjected to flash evaporation treatment for precipitation reaction, wherein the molar ratio of Mg in magnesium salts, N in the ammonia nitrogen wastewater and P in phosphate is 0.8: 1: 1.2, precipitating for 30min at 30 ℃ after stirring, performing solid-liquid separation by a flat membrane separator, and detecting to reduce the ammonia nitrogen in the wastewater to 15.7Mg/L and ensure that the treatment of high-concentration ammonia nitrogen wastewater reaches the standard.
The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.
Claims (9)
1. The treatment process of the ammonia nitrogen wastewater is characterized by comprising the following steps:
s1: adjusting the pH value of the ammonia nitrogen wastewater to be alkaline, performing flocculation sedimentation in a reaction sedimentation tank to obtain supernatant and thick liquid, treating the thick liquid by adopting a filter pressing washing process to obtain filtrate and filter residue, and combining the supernatant and the filtrate to obtain mixed liquid;
s2: filtering the mixed solution by a fiber filter to obtain filtrate;
s3: the filtered liquid falls to the bottom of the ultrasonic flash tower from the top of the ultrasonic flash tower in a spraying mode, an ultrasonic device arranged at the bottom of the ultrasonic flash tower carries out ultrasonic treatment on the pretreatment liquid at the bottom of the ultrasonic flash tower, and ammonia gas continuously generated in the tower is led out and collected through an air outlet pipe; returning the pretreatment liquid at the bottom of the tower to the top of the tower through a circulating pipeline for spraying, and circularly operating for 5-10 h;
s4: adding magnesium salt and phosphate into the ammonia nitrogen wastewater subjected to flash evaporation treatment for precipitation reaction, and performing solid-liquid separation after stirring to finish the treatment of the ammonia nitrogen wastewater.
2. The ammonia nitrogen wastewater treatment process according to claim 1, characterized in that the pH value of the ammonia nitrogen wastewater is adjusted to 9-11.
3. The ammonia nitrogen wastewater treatment process according to claim 1, wherein the pH value regulator is one or more of sodium hydroxide, calcium hydroxide, sodium carbonate and sodium bicarbonate.
4. The ammonia nitrogen wastewater treatment process according to claim 1, characterized in that the temperature of the precipitation reaction is 25-35 ℃, and the time of the precipitation reaction is 20-40 min.
5. The ammonia nitrogen wastewater treatment process according to claim 1, wherein the magnesium salt is magnesium chloride, and the phosphate is sodium dihydrogen phosphate.
6. The ammonia nitrogen wastewater treatment process of claim 1, wherein the molar ratio of Mg in magnesium salts, N in ammonia nitrogen wastewater and P in phosphate is 0.8-0.9: 1: 1.1-1.2.
7. The ammonia nitrogen wastewater treatment process according to claim 1, characterized in that a flat membrane separator is adopted for solid-liquid separation, and an aerator is arranged at the bottom of the flat membrane separator.
8. The ammonia nitrogen wastewater treatment process according to claim 1, wherein the flash evaporation treatment temperature of the filtrate is 60-80 ℃.
9. The ammonia nitrogen wastewater treatment process according to claim 1, wherein the ammonia nitrogen concentration of the ammonia nitrogen wastewater is not less than 5 g/L.
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| CN202011414279.XA CN114605017A (en) | 2020-12-07 | 2020-12-07 | Treatment process of ammonia nitrogen wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115385360A (en) * | 2022-07-26 | 2022-11-25 | 上海御镐实业发展有限公司 | Low-temperature low-pressure ammonia recovery process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115385360A (en) * | 2022-07-26 | 2022-11-25 | 上海御镐实业发展有限公司 | Low-temperature low-pressure ammonia recovery process |
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