CN112047546A - Treatment process for wastewater containing nitrate nitrogen through anodic oxidation - Google Patents
Treatment process for wastewater containing nitrate nitrogen through anodic oxidation Download PDFInfo
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- CN112047546A CN112047546A CN202010797106.4A CN202010797106A CN112047546A CN 112047546 A CN112047546 A CN 112047546A CN 202010797106 A CN202010797106 A CN 202010797106A CN 112047546 A CN112047546 A CN 112047546A
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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
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Abstract
The invention provides a process for treating wastewater containing nitrate nitrogen by anodic oxidation, belongs to the technical field of anodic oxidation wastewater treatment, and particularly relates to a process for treating wastewater containing nitrate nitrogen by anodic oxidation. The process comprises the following steps: electrolytic ion membrane treatment, pure water recovery and pure water reuse, low-temperature evaporation, nitric acid reuse, aluminum nitrate slag liquid treatment, secondary low-temperature evaporation, secondary nitric acid reuse and aluminum sulfate slag liquid treatment. The invention has the following advantages and effects: firstly, the process can realize zero discharge of wastewater, recycling of nitric acid and utilization of waste residues, can thoroughly solve the problem that total nitrogen discharged by wastewater is difficult to reach the standard, and has considerable economic benefit; secondly, the water produced by the separation of the electrolytic ion membrane has high purity, the conductivity is below 10us/cm, and the wastewater can be recycled; thirdly, the nitric acid recovered by the method has high purity, can be used as a raw material for blending and recycling, and can realize the utilization of waste residues; and finally, the process flow is simple, the cost is low, and the popularization and the use are convenient.
Description
Technical Field
The invention belongs to the technical field of anodic oxidation wastewater treatment, and particularly relates to a wastewater treatment process for anodic oxidation of nitrate-containing nitrogen.
Background
In the aluminum material anodic oxidation process, nitric acid is used for removing hanging ash and then cleaning is needed to enter a subsequent procedure, cleaning wastewater contains nitric acid and aluminum nitrate and waste liquid in a concentrated nitric acid tank and needs to be replaced periodically, the wastewater contains nitric acid and aluminum nitrate, nitrate radical is total nitrogen, in order to enable the total nitrogen of the wastewater to reach the standard, a conventional method is physical and chemical precipitation, the total nitrogen is removed by a biological method, and the problem that the total nitrogen is removed by the biological method is high in cost and difficult to reach the standard is solved.
The prior art discloses a comprehensive treatment process for electroplating wastewater with the patent number of CN201811441484.8, which comprises the following steps: (1) collecting electroplating wastewater containing phosphorus, aluminum, cobalt and manganese; (2) adding a sodium hydroxide solution into the wastewater, adjusting the pH value of the wastewater, and adding a compound oxidant to perform an oxidation reaction; (3) immersing the waste nickel-cobalt-manganese ternary lithium battery positive pole piece into acid liquor, adding a reducing agent into the acid liquor, heating, stirring and filtering to obtain filtrate; (4) mixing the wastewater in the step (2) and the filtrate in the step (3), adjusting the pH, and regulating the contents of nickel, cobalt and manganese in the mixed solution to obtain a regulated stock solution; (5) introducing CO gas into the regulating stock solution in the step (4) to obtain a solid material; (6) and (5) drying the solid material obtained in the step (5), adding lithium carbonate, uniformly mixing, performing high-temperature calcination, and obtaining the aluminum oxide coated nickel cobalt lithium manganate material after calcination. The invention combines the waste lithium battery and the electroplating wastewater, improves the electrochemical performance of the lithium battery, and finally discharges the electroplating wastewater up to the standard. Although the process reaches the discharge standard of electroplating wastewater, the reasonable recycling of the wastewater is not achieved.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a process for treating wastewater containing nitrate nitrogen by anodic oxidation, which can realize zero discharge of wastewater, recycling of nitric acid and utilization of waste residues and has considerable social and economic benefits.
Another object of the present invention is to provide a process for treating wastewater containing nitrate nitrogen by anodic oxidation, which can realize the recycling of wastewater.
The invention also aims to provide a process for treating wastewater containing nitrate nitrogen by anodic oxidation, which can realize the recycling of nitric acid in the nitric acid wastewater waste liquid.
The last purpose of the invention is to provide a process for treating wastewater containing nitrate nitrogen by anodic oxidation, which has the advantages of simple process flow, low cost and convenient popularization and use.
In order to achieve the above object, the present invention has the following technical means.
The invention provides a process for treating wastewater containing nitrate nitrogen by anodic oxidation, which comprises the following steps:
the method comprises the following steps: electrolytic ion membrane treatment: introducing the anodic oxidation wastewater containing aluminum nitrate and nitric acid into an electrolytic ion membrane device by using a water pump, and concentrating and separating to obtain a high-purity high-concentration nitric acid concentrated solution and pure water;
step two: and (3) pure water recovery: introducing the pure water obtained by the separation of the electrolytic ion membrane equipment into a pure water recovery tank;
step three: and (3) recycling pure water: introducing the pure water in the pure water recovery tank into a workshop production line by a water pump for cyclic utilization;
step four: low-temperature evaporation: and (3) introducing the concentrated nitric acid and the concentrated aluminum nitrate solution obtained by concentration and separation in the step one into a low-temperature evaporator by utilizing the characteristic of volatility of nitric acid to obtain a high-purity aqueous solution with the nitric acid content of about 40%.
Step five: recycling nitric acid: and (4) diluting the nitric acid solution obtained in the fourth step, and then recycling the nitric acid solution to an anodic oxidation workshop for recycling.
Step six: aluminum nitrate slag liquid treatment: and C, adding the concentrated aluminum nitrate slag liquid obtained in the fourth step into sulfuric acid to react to obtain a mixed liquid of nitric acid and aluminum sulfate.
Step seven: and (3) secondary low-temperature evaporation: and (5) introducing the mixed solution obtained in the sixth step into a low-temperature evaporator for evaporation, and separating out the pure nitric acid water solution.
Step eight: recycling secondary nitric acid: diluting the high-purity nitric acid solution obtained in the step seven, and recycling the diluted high-purity nitric acid solution to a workshop for reuse.
Step nine: treating aluminum sulfate slag liquid: can be used as coagulant aid or phosphorus removing agent.
Further, the ionic membrane electrolysis device in the first step is provided with a direct current electric field.
Further, the ionic membrane electrolysis device in the first step is provided with an ionic membrane, and ions in the wastewater pass through the ionic membrane under the action of a direct current electric field. Thereby achieving the purpose of separating nitric acid and aluminum nitrate from the wastewater.
Further, the conductivity of the pure water in the second step is lower than 10 us/cm.
Further, the evaporation temperature of the low-temperature evaporator in the fourth step is 50 ℃.
Further, the evaporation temperature of the low-temperature evaporator in the seventh step is 50 ℃.
Further, the nonaluminum sulfate liquid slag in the step can be used as a coagulant aid.
Further, the step nonaluminum sulfate liquid slag can be used as a phosphorous removal agent.
Compared with the prior art, the invention has the advantages and effects that: firstly, the process can realize zero discharge of wastewater, recycling of nitric acid and utilization of waste residues, has considerable social and economic benefits, and realizes high-level recycling economy; secondly, the water produced by the separation of the electrolytic ion membrane has high purity, the conductivity is below 10us/cm, the reuse water quality is good, and the cyclic utilization of the waste water can be realized; thirdly, the nitric acid recovered by the method has high purity and can be used as a raw material for blending and recycling, waste slag liquid generated in the process can realize waste slag utilization, the concentration multiple of the ionic membrane in the process can reach 50-100 times or even higher, the concentrated liquid amount is small, and the evaporation cost is low; the method realizes the recycling zero discharge of the waste water, the recycling of the nitric acid and the utilization of the waste residue, and has high social and economic benefits, low cost and convenient popularization and use.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments are provided to further illustrate the present invention in detail, and the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.
In order to achieve the above object, the technical solution of the present invention is as follows.
Referring to fig. 1, the invention provides a process for treating wastewater containing nitrate nitrogen by anodic oxidation, which comprises the following steps:
the method comprises the following steps: electrolytic ion membrane treatment: introducing the waste water containing aluminum nitrate and nitric acid in the anodic oxidation waste water into an electrolytic ion membrane device by using a water pump, and concentrating and separating to obtain a high-purity high-concentration nitric acid concentrated solution and pure water;
step two: and (3) pure water recovery: introducing water obtained by separation of electrolytic ion membrane equipment into a pure water recovery tank;
step three: and (3) recycling pure water: introducing the pure water in the pure water recovery tank into a workshop production line by using a water pump for reuse;
step four: low-temperature evaporation: and (3) introducing the concentrated nitric acid and the concentrated aluminum nitrate solution obtained by concentration and separation in the step one into a low-temperature evaporator by utilizing the characteristic of volatility of nitric acid to obtain a nitric acid solution with the nitric acid content of 40% and the pure water content of 60%, and an aluminum nitrate slag liquid.
Step five: recycling nitric acid: and (4) diluting the nitric acid solution obtained in the fourth step, and then recycling the nitric acid solution to an anodic oxidation workshop for recycling.
Step six: aluminum nitrate slag liquid treatment: and C, adding the concentrated aluminum nitrate slag liquid obtained in the fourth step into sulfuric acid to react to obtain a mixed liquid of nitric acid and aluminum sulfate.
Step seven: and (3) secondary low-temperature evaporation: and (5) introducing the mixed solution obtained in the sixth step into a low-temperature evaporator for evaporation, and separating out nitric acid.
Step eight: recycling secondary nitric acid: and diluting the nitric acid obtained in the step seven, and recycling the nitric acid to a workshop for recycling.
Step nine: treating aluminum sulfate slag liquid: and (4) recycling the residual aluminum sulfate slag liquid obtained in the step seven to obtain the coagulant aid or the phosphorus removing agent.
In this example, the electrolytic ion membrane device in the first step is provided with a direct current electric field.
In this example, the ionic membrane electrolysis device in the first step is provided with an ionic membrane, and ions in the wastewater pass through the ionic membrane under the action of a direct current electric field. Thereby achieving the purpose of separating the nitric acid, the aluminum nitrate concentrated solution and the pure water.
In this example, the ions pass through an ionic membrane.
In the example, the conductivity of the pure water in the second step is lower than 10us/cm, and the pure water is recycled when going to the workshop.
In the present example, the evaporation temperature of the low-temperature evaporator in the fourth step is 50 ℃.
In the present example, the evaporation temperature of the low-temperature evaporator in the seventh step is 50 ℃, and the high-purity nitric acid solution generated by the low-temperature evaporator is returned to the workshop for recycling.
In this example, the aluminum sulfate nonahydrate slag is treated to be used as a coagulant aid.
In this example, the step-nine aluminum sulfate liquid slag is treated to be used as a phosphorous removal agent.
The above examples are only used to illustrate the present invention, and the scope of the present invention is not limited to the above examples, and the waste water and the concentrated solution of the nitric acid compound including zinc and the like are all within the scope of the present invention. The objectives of the present invention can be achieved by the ordinary skilled person in the art according to the disclosure of the present invention and the ranges of the parameters.
Claims (8)
1. A process for treating wastewater containing nitrate nitrogen by anodic oxidation comprises the following steps:
the method comprises the following steps: electrolytic ion membrane treatment: leading the anodic oxidation wastewater containing aluminum nitrate and nitric acid into electrolytic ion membrane equipment by using a water pump, and concentrating and separating; obtaining a concentrated nitric acid solution with high purity and high concentration and simultaneously obtaining pure water;
step two: and (3) pure water recovery: introducing water obtained by separation of electrolytic ion membrane equipment into a pure water recovery tank;
step three: and (3) recycling pure water: introducing the pure water in the pure water recovery tank into a workshop production line by a water pump for cyclic utilization;
step four: low-temperature evaporation: by utilizing the characteristic that nitric acid is volatile, introducing the nitric acid and the aluminum nitrate concentrated solution obtained by concentration and separation in the step one into a low-temperature evaporator, and evaporating to obtain a high-purity aqueous solution with the nitric acid content of about 40%;
step five: recycling nitric acid: diluting the nitric acid solution obtained in the fourth step, and then recycling the nitric acid solution to an anodic oxidation workshop for recycling;
step six: aluminum nitrate slag liquid treatment: adding the concentrated aluminum nitrate residue liquid obtained in the fourth step into sulfuric acid to react to obtain a mixed liquid of nitric acid and aluminum sulfate;
step seven: and (3) secondary low-temperature evaporation: introducing the mixed solution obtained in the sixth step into a low-temperature evaporator for evaporation, and separating out a pure nitric acid water solution;
step eight: recycling secondary nitric acid: diluting the high-purity nitric acid solution obtained in the step seven, and recycling the diluted high-purity nitric acid solution to a workshop for reuse;
step nine: treating aluminum sulfate slag liquid: can be used as coagulant aid or phosphorus removing agent.
2. The process for treating wastewater containing nitrate nitrogen by anodic oxidation according to claim 1, wherein the electrolytic ion membrane device in the first step is provided with a direct current electric field.
3. The process for treating wastewater containing nitrate nitrogen by anodic oxidation according to claim 1, wherein the ionic membrane electrolysis apparatus in the first step is provided with an ionic membrane.
4. The process for the anodic oxidation of wastewater containing nitrate nitrogen as claimed in claim 1, wherein the conductivity of pure water in the second step is less than 10 us/cm.
5. The process for treating waste water containing nitrate nitrogen by anodic oxidation according to claim 1, wherein the vaporization temperature of the low-temperature vaporizer in the fourth step is 50 ℃.
6. The process for treating wastewater containing nitrate nitrogen by anodic oxidation according to claim 1, wherein the vaporization temperature of the low-temperature vaporizer in the seventh step is 50 ℃.
7. The process for treating waste water containing nitrate nitrogen by anodic oxidation as claimed in claim 1, wherein said step nine aluminum sulfate slag liquid is used as coagulant aid.
8. The process for treating wastewater containing nitrate nitrogen by anodic oxidation according to claim 1, wherein the aluminum sulfate slag liquid in the step can be used as a phosphorus removing agent.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213591A (en) * | 2021-05-27 | 2021-08-06 | 深圳市冠融辰环保科技有限公司 | Anodic electrooxidation wastewater treatment process |
| CN113213592A (en) * | 2021-05-27 | 2021-08-06 | 深圳市冠融辰环保科技有限公司 | Method for treating chromium electroplating cleaning wastewater |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11158700A (en) * | 1997-12-03 | 1999-06-15 | Nittetsu Mining Co Ltd | Method for regenerating processing solution consisting essentially of nitric acid for electrolytically etching aluminum foil |
| CN103866344A (en) * | 2014-03-11 | 2014-06-18 | 中国环境科学研究院 | Method for preparing nitric acid through electrolysis |
| CN108203083A (en) * | 2018-01-30 | 2018-06-26 | 新疆智诚同欣环保科技有限公司 | The recovery method and retracting device of a kind of Waste Sulfuric Acid when producing electrode foil and Waste Sulfuric Acid aluminium |
| CN108217614A (en) * | 2018-03-19 | 2018-06-29 | 南通海星电子股份有限公司 | Nitric acid recovery method in electrode foil for aluminum electrolytic capacitors production technology |
-
2020
- 2020-08-10 CN CN202010797106.4A patent/CN112047546A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11158700A (en) * | 1997-12-03 | 1999-06-15 | Nittetsu Mining Co Ltd | Method for regenerating processing solution consisting essentially of nitric acid for electrolytically etching aluminum foil |
| CN103866344A (en) * | 2014-03-11 | 2014-06-18 | 中国环境科学研究院 | Method for preparing nitric acid through electrolysis |
| CN108203083A (en) * | 2018-01-30 | 2018-06-26 | 新疆智诚同欣环保科技有限公司 | The recovery method and retracting device of a kind of Waste Sulfuric Acid when producing electrode foil and Waste Sulfuric Acid aluminium |
| CN108217614A (en) * | 2018-03-19 | 2018-06-29 | 南通海星电子股份有限公司 | Nitric acid recovery method in electrode foil for aluminum electrolytic capacitors production technology |
Non-Patent Citations (1)
| Title |
|---|
| 郭宇杰、修光利、李国亭主编: "《工业废水处理工程》", 31 October 2016, 上海：华东理工大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213591A (en) * | 2021-05-27 | 2021-08-06 | 深圳市冠融辰环保科技有限公司 | Anodic electrooxidation wastewater treatment process |
| CN113213592A (en) * | 2021-05-27 | 2021-08-06 | 深圳市冠融辰环保科技有限公司 | Method for treating chromium electroplating cleaning wastewater |
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Application publication date: 20201208 |