CN110746023A - Treatment method and treatment system for chemical high-salt high-ammonia nitrogen wastewater - Google Patents
Treatment method and treatment system for chemical high-salt high-ammonia nitrogen wastewater Download PDFInfo
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- CN110746023A CN110746023A CN201911017012.4A CN201911017012A CN110746023A CN 110746023 A CN110746023 A CN 110746023A CN 201911017012 A CN201911017012 A CN 201911017012A CN 110746023 A CN110746023 A CN 110746023A
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by 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
- C02F1/66—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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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Abstract
The invention discloses a treatment method and a treatment system for chemical high-salt high-ammonia nitrogen wastewater. The method for treating the chemical high-salt high-ammonia nitrogen wastewater comprises the following steps: adjusting the pH value of the wastewater to weak acidity; evaporating and concentrating the weakly acidic wastewater until the salt content is close to saturation to obtain a concentrated solution and first distilled water; crystallizing the concentrated solution to obtain salt crystals and second distilled water; combining the first distilled water and the second distilled water to obtain a liquid to be treated; adjusting the pH value of the liquid to be treated to weak acidity; intercepting a weakly acidic solution to be treated by a reverse osmosis membrane; the treatment system comprises a pretreatment device, a concentration device, a crystallization device and a reverse osmosis membrane interception device, wherein the pretreatment device is communicated with the concentration device, the concentration device is communicated with the crystallization device, and the crystallization device is communicated with the reverse osmosis membrane interception device. The method for treating the chemical high-salt high-ammonia nitrogen wastewater has high stability and can ensure the quality of the effluent.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment method and a treatment system for chemical high-salt high-ammonia nitrogen wastewater.
Background
At present, chemical high-salt high-ammonia nitrogen wastewater is treated by a biochemical method or a multi-stage A/O method generally. The method has high requirement on water inflow, the stability of a biochemical system is easily impacted by large TDS fluctuation, the survival of strains in the system is damaged, the effluent is easily polluted greatly, and even the whole system is crashed. However, the method of evaporation concentration treatment is not thorough, and the treatment effect and the effluent quality cannot be guaranteed.
Disclosure of Invention
Therefore, the invention needs to provide a treatment method of chemical high-salt high-ammonia nitrogen wastewater, which has high stability and can ensure the quality of effluent.
The invention also provides a treatment system for the chemical high-salt high-ammonia nitrogen wastewater.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a treatment method of chemical high-salt high-ammonia nitrogen wastewater comprises the following steps:
adjusting the pH value of the wastewater to weak acidity;
evaporating and concentrating the weakly acidic wastewater until the salt content is close to saturation to obtain a concentrated solution and first distilled water;
crystallizing the concentrated solution to obtain salt crystals and second distilled water;
combining the first distilled water and the second distilled water to obtain a liquid to be treated;
adjusting the pH value of the liquid to be treated to weak acidity;
and (3) carrying out reverse osmosis membrane interception treatment on the weakly acidic liquid to be treated.
The method for treating the chemical high-salt high-ammonia nitrogen wastewater comprises the steps of firstly adjusting organic nitrogen in the wastewater into ammonium salt, improving the concentration of the wastewater in an evaporation concentration mode, then crystallizing to wash out most of ammonium salt, carrying volatile ammonia gas in steam in the steps of evaporation concentration and salt crystallization, forming distilled water after the steam is cooled, adjusting the pH value of the distilled water to change the volatile ammonia gas into ammonium salt, intercepting the ammonium salt by a reverse osmosis membrane intercepting device, and removing ammonium ions in the ammonium salt.
In some embodiments, the step of adjusting the pH of the wastewater to be weakly acidic is to add sulfuric acid to the wastewater to adjust the pH of the wastewater to 4 to 5.
In some embodiments, the step of adjusting the pH value of the solution to be treated to weak acidity is to add sulfuric acid to the solution to be treated to adjust the pH value of the solution to be treated to weak acidity.
In some embodiments, in the step of evaporating and concentrating the weakly acidic wastewater until the salt content is close to saturation to obtain a concentrated solution, an MVR horizontal tube falling film concentration device is used for evaporating and concentrating the wastewater; and in the step of crystallizing the concentrated solution to obtain salt crystals and second distilled water, crystallizing the concentrated solution to obtain salt by adopting an MVR crystallization device.
In some embodiments, the treatment method further comprises the step of evaporating and concentrating part of the liquid to be treated again.
The invention also provides a treatment system of the chemical high-salt high-ammonia-nitrogen wastewater, which comprises a pretreatment device, a concentration device, a crystallization device and a reverse osmosis membrane interception device, wherein the pretreatment device is communicated with the concentration device, the concentration device is communicated with the crystallization device, the crystallization device is communicated with the reverse osmosis membrane interception device, the pretreatment device is used for adjusting the pH value of the wastewater to obtain weakly acidic wastewater, the concentration device is used for receiving the weakly acidic wastewater and carrying out evaporation concentration to form concentrated solution and first distilled water, the crystallization device is used for receiving the concentrated solution and crystallizing out salt to obtain salt crystals and second distilled water, and the reverse osmosis membrane interception device is used for receiving the first distilled water and the second distilled water and carrying out interception treatment.
In some embodiments, the treatment system further comprises a dosing device, wherein the dosing device is respectively communicated with the pretreatment device and the reverse osmosis membrane interception device, and is used for adding acid liquor into the pretreatment device and the reverse osmosis membrane interception device.
In some embodiments, the treatment system further comprises a water storage container, the water storage container is respectively communicated with the concentration device, the crystallization device, the reverse osmosis membrane interception device and the chemical adding device, and is used for receiving the first distilled water treated by the concentration device and the second distilled water treated by the crystallization device, receiving the acid liquor of the chemical adding device, and communicating the first distilled water and the second distilled water added with the acid liquor to the reverse osmosis membrane interception device.
In some embodiments, the water storage container is communicated with the concentration device to return the first distilled water and the second distilled water to the concentration device for circulation treatment.
In some embodiments, the concentration device is a MVR horizontal tube falling film concentration device, and the crystallization device is a MVR crystallization device.
Drawings
FIG. 1 is a flow chart of a method for treating chemical high-salt high-ammonia nitrogen wastewater according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a chemical high-salt high-ammonia nitrogen wastewater treatment device according to an embodiment of the invention.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, 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.
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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example one
Referring to fig. 1, the invention provides a treatment method of chemical high-salt high-ammonia nitrogen wastewater, which is used for recovering salt and ammonia nitrogen in the wastewater to enable the wastewater to reach the discharge standard, and the treatment method comprises the following steps:
adjusting the pH value of the wastewater to weak acidity;
evaporating and concentrating the weakly acidic wastewater until the salt content is close to saturation to obtain a concentrated solution and first distilled water;
crystallizing the concentrated solution to obtain salt crystals and second distilled water;
combining the first distilled water and the second distilled water to obtain a liquid to be treated;
adjusting the pH value of the liquid to be treated to weak acidity;
and (3) intercepting the weakly acidic solution to be treated by a reverse osmosis membrane.
According to the treatment method, organic nitrogen in the wastewater is firstly adjusted into ammonium salt by adjusting the pH value, the concentration of the wastewater is improved by means of evaporation and concentration, the wastewater is remained in the concentrated solution during evaporation, the hot steam carries with the volatile ammonia gas, first distilled water is formed after cooling, salt is crystallized from the concentrated solution, the salt in the concentrated solution forms solid crystals, ammonium salt in the concentrated solution is washed out, the volatile ammonia gas is taken away by the hot steam and forms second distilled water after cooling, the first distilled water and the second distilled water are combined and then adjusted to weak acidity, the volatile ammonia gas forms ammonium salt, and the ammonium salt in the volatile ammonia gas is efficiently intercepted by the reverse osmosis membrane through reverse osmosis membrane interception treatment, so that water with little salt and ammonia nitrogen is obtained.
Compared with biochemical treatment, the method does not use microorganisms, has lower requirement on inflow water, and has stable treatment system even though TDS has large fluctuation; compared with the existing single evaporation treatment method, most of ammonia nitrogen in the ammonia nitrogen is changed into ammonium salt due to the fact that acidification treatment is carried out in advance, the efficiency of evaporation removal is high, and finally the ammonia nitrogen is recovered with high efficiency through interception treatment, so that the quality of effluent water can be guaranteed.
Since the wastewater is alkaline, the pH value is adjusted to be weakly acidic and is adjusted to 4-5. The method of adjustment may be any method known in the art. As the waste water is alkaline, strong acid such as sulfuric acid, hydrochloric acid and the like is added for regulation. Preferably, treatment with sulfuric acid results in the formation of stable ammonium sulfate.
The steps are as follows: the weakly acidic wastewater is evaporated and concentrated until the salt content is close to saturation, and an MVR horizontal pipe falling film concentration device is adopted to evaporate and concentrate the wastewater. The MVR horizontal pipe falling film concentration device is large in treatment capacity, high in treatment efficiency and high in stability.
The steps are as follows: crystallizing the concentrated solution to obtain salt by adopting an MVR crystallization device. MVR crystallization device's handling capacity is big, the treatment effeciency is high, and can with MVR horizontal pipe falling film enrichment facility adaptation, guarantee the stability of system.
In the method, after the first distilled water and the second distilled water are combined to obtain the liquid to be treated, part of the liquid to be treated can return to be evaporated and concentrated again, and then the steps of crystallizing to obtain salt and the like are carried out, so that the water formed by evaporation and crystallization is recycled again, and the treatment effect is ensured. Or returning to the evaporation concentration treatment after the pH value of the liquid to be treated reaches weak acidity, so that the ammonia nitrogen in the distilled water forms ammonium salt, and the salt crystallization effect is better.
The reverse osmosis membrane is preferably a Dow brackish water membrane, and has high retention efficiency on ammonium salt in distilled water.
Example two
Referring to fig. 2, the present embodiment provides a chemical high-salt high-ammonia nitrogen wastewater treatment system 100, which includes a pretreatment device 10, a concentration device 20, a crystallization device 30 and a reverse osmosis membrane retention device 40, wherein the pretreatment device 10 is communicated with the concentration device 20, the concentration device 20 is communicated with the crystallization device 30, the crystallization device 30 is communicated with the reverse osmosis membrane retention device 40, the pretreatment device 10 is configured to adjust a pH value of wastewater to obtain weak acid wastewater, the concentration device 20 is configured to receive the weak acid wastewater and perform evaporation concentration to form a concentrated solution and first distilled water, the crystallization device 30 is configured to receive the concentrated solution and crystallize salt to obtain salt crystals and second distilled water, and the reverse osmosis membrane retention device 40 is configured to receive the first distilled water and the second distilled water and perform retention treatment.
Further, the treatment system 100 further comprises a dosing device 50, wherein the dosing device 50 is respectively communicated with the pretreatment device 10 and the reverse osmosis membrane interception device 40, and is used for adding acid liquor into the pretreatment device 10 and the reverse osmosis membrane interception device 40. Preferably, the applicator 50 is an automatic applicator, and after being activated, acid solution can be continuously added thereto.
Further, the treatment system 100 further includes a water storage container 60, the water storage container 60 is respectively communicated with the concentration device 20, the crystallization device 30, the reverse osmosis membrane interception device 40 and the chemical adding device 50, the water storage container 60 is configured to receive the distilled water obtained by the treatment of the concentration device 20 and the distilled water obtained by the treatment of the crystallization device 30, receive the acid solution of the chemical adding device 50, and introduce the distilled water added with the acid solution into the reverse osmosis membrane interception device 40. The liquid to be treated formed by combining the first distilled water and the second distilled water is stored in the water storage container 60 so as to be communicated to the reverse osmosis membrane interception device 40.
Further, the water storage container 60 is communicated with the concentration device 20 to return the first distilled water and the second distilled water, i.e. the liquid to be treated, to the concentration device 20 for circulation treatment. Evaporating and crystallizing again to separate out ammonium salt, thereby ensuring the treatment effect of the ammonium salt.
Wherein, the above-mentioned concentration device 20 is an MVR horizontal tube falling film concentration device, and the crystallization device 30 is an MVR crystallization device. MVR horizontal pipe falling film enrichment facility and MVR crystallization device handling capacity are big, the treatment effeciency is high, and can guarantee the stability of system's operation.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A treatment method of chemical high-salt high-ammonia nitrogen wastewater is characterized by comprising the following steps:
adjusting the pH value of the wastewater to weak acidity;
evaporating and concentrating the weakly acidic wastewater until the salt content is close to saturation to obtain a concentrated solution and first distilled water;
crystallizing the concentrated solution to obtain salt crystals and second distilled water;
combining the first distilled water and the second distilled water to obtain a liquid to be treated;
adjusting the pH value of the liquid to be treated to weak acidity;
and (3) carrying out reverse osmosis membrane interception treatment on the weakly acidic liquid to be treated.
2. The method for treating high-salinity high-ammonia-nitrogen wastewater as claimed in claim 1, wherein the step of adjusting the pH value of the wastewater to weak acidity is to add sulfuric acid into the wastewater to adjust the pH value of the wastewater to 4-5.
3. The method for treating high-salinity high-ammonia-nitrogen wastewater according to claim 1, wherein the step of adjusting the pH value of the solution to be treated to weak acidity is to add sulfuric acid into the solution to be treated to adjust the pH value of the solution to be treated to weak acidity.
4. The method for treating the chemical high-salt high-ammonia nitrogen wastewater as claimed in claim 1, wherein in the step of evaporating and concentrating the weakly acidic wastewater until the salt content is close to saturation to obtain a concentrated solution, an MVR horizontal tube falling film concentration device is adopted to evaporate and concentrate the wastewater; and in the step of crystallizing the concentrated solution to obtain salt crystals and second distilled water, crystallizing the concentrated solution to obtain salt by adopting an MVR crystallization device.
5. The method for treating the chemical high-salt high-ammonia nitrogen wastewater as claimed in any one of claims 1-4, wherein the method further comprises the step of evaporating and concentrating part of the liquid to be treated again.
6. The utility model provides a processing system of high ammonia-nitrogen concentration waste water of chemical industry, its characterized in that, includes preprocessing device, enrichment facility, crystallization device and reverse osmosis membrane trapping apparatus, the preprocessing device intercommunication enrichment facility, the enrichment facility intercommunication crystallization device, the crystallization device intercommunication reverse osmosis membrane trapping apparatus, preprocessing device is used for adjusting the pH value of waste water, obtains weak acid waste water, enrichment facility is used for receiving weak acid waste water carries out evaporation concentration to form concentrate and first distilled water, crystallization device is used for receiving concentrate and crystallization salt, obtain salt crystal and with second distilled water, reverse osmosis membrane trapping apparatus is used for receiving first distilled water with second distilled water carries out the interception and handles.
7. The system for treating chemical high-salt high-ammonia nitrogen wastewater as claimed in claim 6, further comprising a dosing device, wherein the dosing device is respectively communicated with the pretreatment device and the reverse osmosis membrane interception device, and is used for adding acid liquor into the pretreatment device and the reverse osmosis membrane interception device.
8. The system for treating chemical high-salt high-ammonia nitrogen wastewater as claimed in claim 7, further comprising a water storage container, wherein the water storage container is respectively communicated with the concentration device, the crystallization device, the reverse osmosis membrane interception device and the chemical dosing device, and is configured to receive the first distilled water treated by the concentration device and the second distilled water treated by the crystallization device, receive the acid solution of the chemical dosing device, and communicate the first distilled water and the second distilled water added with the acid solution to the reverse osmosis membrane interception device.
9. The system for treating chemical high-salt high-ammonia nitrogen wastewater as claimed in claim 8, wherein the water storage container is communicated with the concentration device to return the first distilled water and the second distilled water to the concentration device for circulation treatment.
10. The treatment system for the chemical high-salt high-ammonia nitrogen wastewater as claimed in claim 6, wherein the concentration device is an MVR horizontal tube falling film concentration device, and the crystallization device is an MVR crystallization device.
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| CN111748012A (en) * | 2020-06-22 | 2020-10-09 | 广东闻扬环境科技有限公司 | Device and method for recovering ammonium from ammonian-containing stock solution and concentrating protein stock solution |
| CN114212948A (en) * | 2021-11-25 | 2022-03-22 | 嘉兴溪上源环保科技有限公司 | Treatment method of waste engine oil/lubricating oil regeneration distillation wastewater |
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