CN106698793A - Method and system for treating ammonia-nitrogen-containing wastewater - Google Patents
Method and system for treating ammonia-nitrogen-containing wastewater Download PDFInfo
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- CN106698793A CN106698793A CN201710050083.9A CN201710050083A CN106698793A CN 106698793 A CN106698793 A CN 106698793A CN 201710050083 A CN201710050083 A CN 201710050083A CN 106698793 A CN106698793 A CN 106698793A
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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
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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
- C02F1/26—Treatment of water, waste water, or sewage by extraction
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
Abstract
The invention provides a method and system for treating ammonia-nitrogen-containing wastewater. The ammonia-nitrogen-containing wastewater is originated from wastewater generated in a process of preparing a metal carbonate by using an ammonium carbonate or ammonium hydrogen carbonate raw material. The method comprises the following steps: directly crystallizing the wastewater, the ammonia-nitrogen concentration of which is greater than 20g/L, to obtain ammonium salt crystals; using the wastewater, the ammonia-nitrogen concentration of which is between 10g/L and 20g/L, as a dissolving agent which dissolves the ammonium carbonate or ammonium hydrogen carbonate raw material, or a dissolving agent of a back-extractant which enables metal ions in an organic phase to transfer, or a part of the wastewater as the dissolving agent which dissolves the ammonium carbonate or ammonium hydrogen carbonate raw material, and the residual part of the wastewater as the dissolving agent of the back-extractant which enables metal ions in the organic phase to transfer; and using the wastewater, the ammonia-nitrogen concentration of which is smaller than 10g/L, as a washing liquid of the metal carbonate. With adoption of the method and system provided by the invention, a water body is prevented from being polluted due to direct discharge of high-concentration ammonia-nitrogen wastewater, and the method is simple to operate and easy to popularize industrially.
Description
Technical field
The present invention relates to environmental pollution process for comprehensively treating field, more particularly to a kind of method for processing nitrogen-containing wastewater and
System.
Background technology
Ammonia nitrogen is one of main pollutant in China's water body, can result in body eutrophication, promotes algae reproduction, greatly
Dissolved oxygen in amount consumption water body, causes organism in water is dead, water body fouls etc..Waste water containing ammonia nitrogen is mainly derived from coloured smelting
The industries such as gold, chemical industry, biofermentation, ammonia nitrogen pollutant is mainly present in water with ammonium root, free state molecular forms in ammonia nitrogen waste water
In.
In the prior art, it will usually processed nitrogen-containing wastewater using single technique, technology common at present
There are evaporating, concentrating and crystallizing method, distillation rectification method, stripping hair, chemical precipitation method, but single handling process is except relatively costly
Outward, more waste water containing finite concentration ammonia nitrogen can also be produced.
The Chinese patent application of Publication No. CN102060406A discloses a kind of method that blow-off method processes ammonia nitrogen waste water,
By the way that packed tower is by the ammonia-nitrogen desorption in waste water and absorbs recovery.The Chinese patent application of Publication No. CN1958471A is disclosed
A kind of processing method of ammonia nitrogen waste water, the method first has to add a large amount of alkali to adjust pH value in waste water, is gone through separation of solid and liquid
Except the suspension in waste water and the sial ion and its compound of dissolving；Calcium ion generation calcium sulfate precipitation is added, through solid-liquid point
Acidic materials in waste water is reduced；Carbanion generation precipitation of calcium carbonate is added, through the calcium in separation of solid and liquid removal waste water
Ion；It is last to adjust pH value between 9.5~13 with alkali again, carry out stripping deamination and biochemical treatment, it is that waste water reaches national row
Put standard.
The above method, is required for using alkali to adjust to suitable pH ammonia nitrogen waste water, but when ammonia nitrogen concentration is higher, pH is not
In the case of height, regulation pH can consume a large amount of alkali, so as to cause secondary pollution to water body.Therefore, a kind of energy of research and development is needed badly
The ammonia nitrogen of Coal Gas Washing Cycling Water is enough processed, while secondary pollution will not be caused to water body, and cost is relatively low, it is easy to and industrialization is pushed away
Wide method and system.
The content of the invention
In order to solve the above technical problems, first aspect present invention provides a kind of method for processing nitrogen-containing wastewater, it is described
Nitrogen-containing wastewater prepare the waste water produced during metal carbonate from by ammonium carbonate or ammonium hydrogen carbonate raw material, wherein
Waste water by ammonia nitrogen concentration more than 20g/L is directly crystallized, and obtains ammonium salt crystal；
Waste water by ammonia nitrogen concentration between 10g/L~20g/L, as dissolving the molten of the ammonium carbonate or ammonium hydrogen carbonate raw material
Solution agent；Or as the lytic agent of the back washing agent for shifting the metal ion in organic phase；Or a part is described as dissolving
The lytic agent of ammonium carbonate or ammonium hydrogen carbonate raw material, remainder is used as the back washing agent for shifting the metal ion in organic phase
Lytic agent；
Ammonia nitrogen concentration is less than the waste water of 10g/L as the cleaning solution of the metal carbonate.
Wherein, the temperature of described crystallization is 35~55 DEG C, and the time is 1~4h.
Wherein, described metal ion be cobalt ions, nickel ion, manganese ion, magnesium ion or other can generate carbonate
Metal ion.
Wherein, in the nitrogen-containing wastewater, the waste water between 10g/L≤ammonia nitrogen concentration≤13g/L is used as the dissolving carbon
The lytic agent of sour ammonium or ammonium hydrogen carbonate raw material.
Wherein, in the nitrogen-containing wastewater, during 13g/L ＜ ammonia nitrogen concentration ＜ 18g/L, 30%~80% waste water is used as dissolving
The lytic agent of the ammonium carbonate or ammonium hydrogen carbonate raw material, remainder as the metal ion made in organic phase shift it is anti-
Extract the lytic agent of agent.
Preferably, in the nitrogen-containing wastewater, during 13g/L ＜ ammonia nitrogen concentration ＜ 18g/L, 45%~70% waste water is used as molten
The lytic agent of the ammonium carbonate or ammonium hydrogen carbonate raw material is solved, remainder is shifted as the metal ion made in organic phase
The lytic agent of back washing agent.
Wherein, in the nitrogen-containing wastewater, waste water between 18g/L≤ammonia nitrogen concentration≤20g/L is used as in making organic phase
The lytic agent of back washing agent that shifts of metal ion.
Second aspect present invention provides a kind of system for processing nitrogen-containing wastewater, including reaction unit, wash mill, knot
Brilliant device and back extraction device, are connected with the first pipeline in the reaction unit, the reaction unit and the crystallization apparatus it
Between be connected with the second pipeline, be connected with the 3rd pipeline between the wash mill and the reaction unit, the wash mill and
The 4th pipeline is connected between the back extraction device, the 5th pipe is connected between the back extraction device and the reaction unit
Road.
Wherein, it is respectively arranged with the first described pipeline, the second pipeline, the 3rd pipeline, the 4th pipeline and the 5th pipeline
Pump.
Wherein, it is respectively arranged with the first described pipeline, the second pipeline, the 3rd pipeline, the 4th pipeline and the 5th pipeline
Valve.
Beneficial effects of the present invention：
The system of the treatment nitrogen-containing wastewater provided by the present invention, can be produced to different links in metal carbonate technology of threonates
Raw waste water is respectively processed, and when the ammonia nitrogen concentration in waste water is more than or equal to 20g/L, can be directly entered by the second pipeline
Crystallization apparatus, generate ammonium salt crystal.
When the ammonia nitrogen concentration in waste water is between 10g/L~20g/L, can by the 3rd pipeline enter reaction unit be used for after
Continuous dissolving ammonium carbonate or ammonium hydrogen carbonate, so as to can not only reduce the usage amount of deionized water, can also will be unnecessary in waste water
Carbanion further generates metal carbonate precipitate, while improve further the ammonia nitrogen concentration in waste water, so that
Crystallization apparatus are entered by the second pipeline and generates ammonium salt crystal；Or first pass through the 4th pipeline and enter into back extraction device, make organic
Metal ion in phase is entered into waste water, then is entered into reaction unit by the 5th pipeline, in can not only making waste water
Metal ion can again as the raw material of generation metal carbonate, it is to avoid directly discharge causes water pollution, while can also make
Ammonia nitrogen in waste water is further improved in reaction unit, so that entering crystallization apparatus by the second pipeline generates ammonium salt crystal.
When the ammonia nitrogen concentration in waste water is less than or equal to 10g/L, it is heavy to metal carbonate in wash mill directly to stay in
Shallow lake is cleaned, and on the one hand reduces direct discharging of waste water and causes water pollution, and still further aspect also saves metal carbonate
The usage amount of deionized water in production process.
The system provided by the present invention, can respectively process the different ammonia nitrogens produced in metal carbonate production process dense
The waste water of degree, the direct discharge of ammonia nitrogen waste water that not only avoid high concentration is polluted to water body, while can also effectively using useless
Carbanion and metal ion in water, make it again as the raw material of production metal carbonate.The system architecture is simple, easily
In operation, it is easy to Industry Promotion.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, letter will be made to the accompanying drawing needed to use in implementation method below
Singly introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, correspond to the general of this area
For logical technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the treatment nitrogen-containing wastewater system that the present invention is provided；
In figure：1- reaction units, 2- wash mills, 3- crystallization apparatus, 4- back extraction devices, the pipelines of 5- first, 6- second is managed
Road, the pipelines of 7- the 3rd, the pipelines of 8- the 4th, the pipelines of 9- the 5th.
Specific embodiment
The following is the preferred embodiment of the present invention, it is noted that for those skilled in the art,
Under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as this hair
Bright protection domain.
First aspect present invention provides a kind of method for processing nitrogen-containing wastewater, described nitrogen-containing wastewater derive from by
The waste water that ammonium carbonate or ammonium hydrogen carbonate raw material are produced during preparing metal carbonate, ammonia nitrogen concentration is useless more than 20g/L
Water is directly crystallized, and obtains ammonium salt crystal；
Waste water by ammonia nitrogen concentration between 10g/L~20g/L, as dissolving the molten of the ammonium carbonate or ammonium hydrogen carbonate raw material
Solution agent；Or as the lytic agent of the back washing agent for shifting the metal ion in organic phase；Or a part is described as dissolving
The lytic agent of ammonium carbonate or ammonium hydrogen carbonate raw material, remainder is used as the back washing agent for shifting the metal ion in organic phase
Lytic agent；
Ammonia nitrogen concentration is less than the waste water of 10g/L as the cleaning solution of the metal carbonate.
In embodiments of the present invention, the temperature of described crystallization is 35~55 DEG C, and the time is 1~4h.
Preferably, the temperature of described crystallization is 35~45 DEG C, and the time is 1.5~3h.
In embodiments of the present invention, described metal ion be cobalt ions, nickel ion, manganese ion, magnesium ion or other
The metal ion of carbonate can be generated.
In embodiments of the present invention, in the nitrogen-containing wastewater, the waste water between 10g/L≤ammonia nitrogen concentration≤13g/L
As the lytic agent for dissolving the ammonium carbonate or ammonium hydrogen carbonate raw material.
In embodiments of the present invention, in the nitrogen-containing wastewater, during 13g/L ＜ ammonia nitrogen concentration ＜ 18g/L, 30%~80%
Waste water as the lytic agent for dissolving the ammonium carbonate or ammonium hydrogen carbonate raw material, remainder as the metal made in organic phase from
The lytic agent of the back washing agent that son is shifted.
Preferably, in the nitrogen-containing wastewater, during 13g/L ＜ ammonia nitrogen concentration ＜ 18g/L, 45%~70% waste water is used as molten
The lytic agent of the ammonium carbonate or ammonium hydrogen carbonate raw material is solved, remainder is shifted as the metal ion made in organic phase
The lytic agent of back washing agent.
In embodiments of the present invention, in the nitrogen-containing wastewater, the waste water between 18g/L≤ammonia nitrogen concentration≤20g/L
As the lytic agent of the back washing agent for shifting the metal ion in organic phase.
Second aspect present invention provide it is a kind of process nitrogen-containing wastewater system, including reaction unit 1, wash mill 2,
Crystallization apparatus 3 and back extraction device 4, are connected with the first pipeline 5, the reaction unit 1 and the crystallization in the reaction unit 1
The second pipeline 6 is connected between 3 devices, the 3rd pipeline 7 is connected between the wash mill 2 and the reaction unit 1, it is described
The 4th pipeline 8, back extraction device 4 and the reaction unit 1 are connected between wash mill 2 and the back extraction device 4
Between be connected with the 5th pipeline 9.
In embodiments of the present invention, the first described pipeline 5, the second pipeline 6, the 3rd pipeline 7, the 4th pipeline 8 and
Pump is respectively arranged with five pipelines 9.
In embodiments of the present invention, the first described pipeline 5, the second pipeline 6, the 3rd pipeline 7, the 4th pipeline 8 and
Valve is respectively arranged with five pipelines 9.
The nitrogen-containing wastewater of present invention treatment is mainly the process that metal carbonate is produced using ammonium carbonate or ammonium hydrogen carbonate
Middle generation, the concrete technology for preparing metal carbonate is：First by ammonium carbonate or ammonium hydrogen carbonate deionized water dissolving, it is configured to
Certain density precipitating reagent, adds certain density metal ion solution, and reaction prepares corresponding metal carbonate and sinks
Form sediment, finally repeatedly washed metal carbonate precipitate, filter, drying can obtain metal carbonate product.
Embodiment 1
First by ammonium hydrogen carbonate deionized water dissolving, certain density precipitating reagent is configured to, adds cobalt chloride solution and sunk
Form sediment and react, generation cobalt carbonate precipitation, by detection, ammonia nitrogen concentration is 21.3g/L in precipitation Mother liquor.
（1）Mother liquor after above-mentioned precipitation is entered into crystallization apparatus 3 by the second pipeline 6, concentration, cooling knot is evaporated
Crystalline substance, obtains ammonia chloride crystal and crystalline mother solution, and crystalline mother solution continues to be concentrated by evaporation.
（2）Above-mentioned cobalt carbonate precipitation is washed with deionized water, the waste water after once washing is detected, ammonia nitrogen
Concentration is 11.1g/L, and the waste water to being produced in the washing process enters reaction unit 1 by the 3rd pipeline 7, instead of deionized water
For dissolving ammonium hydrogen carbonate, adding cobalt chloride and carrying out solution carries out precipitation reaction, and generation cobalt carbonate precipitation, by detection, is sunk
Ammonia nitrogen concentration is 26.5g/L in the Mother liquor of shallow lake, continues repeat step（1）.
（3）Secondary, three washings are carried out to the cobalt carbonate precipitation after above-mentioned once washing, after secondary, three washings
Waste water is detected that ammonia nitrogen concentration is respectively 5.4g/L and 1.8g/L, and the effluent part can continue on for cleaning cobalt carbonate precipitation,
When concentration is higher than 10 g/L, can continue to repeat the above steps（2）, can reduce by 60% deionized water consumption by the method,
The mother liquor of more high-concentration ammonia-nitrogen is ultimately generated, ammonia nitrogen concentration is 28 g/L after testing.
Embodiment 2
First by the once washing water dissolves that ammonium hydrogen carbonate ammonia nitrogen concentration is 12.6g/L, certain density precipitating reagent is configured to, then
Adding cobalt sulfate solution carries out precipitation reaction, and generation cobalt carbonate is precipitated, and by detection, ammonia nitrogen concentration is in precipitation Mother liquor
28.8g/L。
（1）Mother liquor after above-mentioned precipitation is entered into crystallization apparatus 3 by the second pipeline 6, concentration, cooling knot is evaporated
Crystalline substance, obtains ammonia sulfate crystal and crystalline mother solution, and crystalline mother solution continues to be concentrated by evaporation.
（2）Above-mentioned cobalt carbonate precipitation is washed with deionized water, the waste water after once washing is detected, ammonia nitrogen
Concentration is 13.1g/L, in the washing process produce waste water 55% by the 3rd pipeline 7 enter reaction unit 1, instead of go from
Sub- water is used to dissolve ammonium hydrogen carbonate；45% enters back extraction device 4 by the 4th pipeline 8, by the cobalt back extraction in organic phase to waste water
In, then reaction unit 1, generation cobalt carbonate precipitation, by detection, ammonia nitrogen concentration in precipitation Mother liquor are entered by the 5th pipeline 9
It is 29.5g/L, continues repeat step（1）.
（3）Secondary, three washings are carried out to the cobalt carbonate precipitation after above-mentioned once washing, after secondary, three washings
Waste water is detected that ammonia nitrogen concentration is respectively 6.8g/L and 2.7g/L, and the effluent part can continue on for cleaning cobalt carbonate precipitation,
When concentration is higher than 10 g/L, can continue to repeat the above steps（2）Can reduce by 58% deionized water consumption by the method,
The mother liquor of more high-concentration ammonia-nitrogen is ultimately generated, ammonia nitrogen concentration is 30 g/L after testing.
Embodiment 3
First the deionized water and once washing water dissolves that 50% ammonia nitrogen concentration is 14.8g/L by ammonium carbonate with 50%, are configured to one
Determine the precipitating reagent of concentration, adding cobalt chloride solution carries out precipitation reaction, and generation cobalt carbonate precipitation, by detection, precipitates stepmother
Ammonia nitrogen concentration is 29.3g/L in liquid.
（1）Mother liquor after above-mentioned precipitation is entered into crystallization apparatus by the second pipeline 6, concentration is evaporated, crystallisation by cooling,
Ammonia chloride crystal and crystalline mother solution are obtained, crystalline mother solution continues to be concentrated by evaporation.
（2）Above-mentioned cobalt carbonate precipitation is washed with deionized water, the waste water after once washing is detected, ammonia nitrogen
Concentration is 13.6g/L, in the washing process produce waste water 50% by the 3rd pipeline 7 enter reaction unit 1, instead of go from
Sub- water is used to dissolve ammonium hydrogen carbonate；50% enters back extraction device 4 by the 4th pipeline 8, by the cobalt back extraction in organic phase to waste water
In, then reaction unit 1, generation cobalt carbonate precipitation, by detection, ammonia nitrogen concentration in precipitation Mother liquor are entered by the 5th pipeline 9
It is 31.2g/L, continues repeat step（1）.
（3）Secondary, three washings are carried out to the cobalt carbonate precipitation after above-mentioned once washing, after secondary, three washings
Waste water is detected that ammonia nitrogen concentration is respectively 7.0g/L and 2.7g/L, and the effluent part can continue on for cleaning cobalt carbonate precipitation,
When concentration is higher than 10 g/L, can continue to repeat the above steps（2）, can reduce by 58% deionized water consumption by the method,
The mother liquor of more high-concentration ammonia-nitrogen is ultimately generated, ammonia nitrogen concentration is 32 g/L after testing.
Embodiment 4
First by the once washing water dissolves that ammonium carbonate ammonia nitrogen concentration is 15.1g/L, certain density precipitating reagent is configured to, then add
Entering cobalt sulfate solution carries out precipitation reaction, and generation cobalt carbonate is precipitated, and by detection, ammonia nitrogen concentration is 35.2g/ in precipitation Mother liquor
L。
（1）Mother liquor after above-mentioned precipitation is entered into crystallization apparatus 3 by the second pipeline 6, concentration, cooling knot is evaporated
Crystalline substance, obtains ammonia sulfate crystal and crystalline mother solution, and crystalline mother solution continues to be concentrated by evaporation.
（2）Above-mentioned cobalt carbonate precipitation is washed with deionized water, the waste water after once washing is detected, ammonia nitrogen
Concentration is 15.6g/L, in the washing process produce waste water 56% by the 3rd pipeline 7 enter reaction unit 1, instead of go from
Sub- water is used to dissolve ammonium hydrogen carbonate；44% enters back extraction device 4 by the 4th pipeline 8, by the cobalt back extraction in organic phase to waste water
In, then reaction unit 1, generation cobalt carbonate precipitation, by detection, ammonia nitrogen concentration in precipitation Mother liquor are entered by the 5th pipeline 9
It is 36.6g/L, continues repeat step（1）.
（3）Secondary, three washings are carried out to the cobalt carbonate precipitation after above-mentioned once washing, after secondary, three washings
Waste water is detected that ammonia nitrogen concentration is respectively 8.4g/L and 3.2g/L, and the effluent part can continue on for cleaning cobalt carbonate precipitation,
When concentration is higher than 10 g/L, can continue to repeat the above steps（2）, can reduce by 55% deionized water consumption by the method,
The mother liquor of more high-concentration ammonia-nitrogen is ultimately generated, ammonia nitrogen concentration is 37.5 g/L after testing.
Embodiment 5
First by the once washing water dissolves that ammonium carbonate ammonia nitrogen concentration is 16.2g/L, certain density precipitating reagent is configured to, then add
Entering cobalt sulfate solution carries out precipitation reaction, and generation cobalt carbonate is precipitated, and by detection, ammonia nitrogen concentration is 36.8g/ in precipitation Mother liquor
L。
（1）Mother liquor after above-mentioned precipitation is entered into crystallization apparatus 3 by the second pipeline 6, concentration, cooling knot is evaporated
Crystalline substance, obtains ammonia sulfate crystal and crystalline mother solution, and crystalline mother solution continues to be concentrated by evaporation.
（2）Above-mentioned cobalt carbonate precipitation is washed with deionized water, the waste water after once washing is detected, ammonia nitrogen
Concentration is 18.2g/L, and the waste water to being produced in the washing process enters back extraction device 4 by the 4th pipeline 8, by organic phase
Cobalt back extraction in waste water, then reaction unit 1, generation cobalt carbonate precipitation, by detection, after precipitation are entered by the 5th pipeline 9
Ammonia nitrogen concentration is 37.4g/L in mother liquor, continues repeat step（1）.
（3）Secondary, three washings are carried out to the cobalt carbonate precipitation after above-mentioned once washing, after secondary, three washings
Waste water is detected that ammonia nitrogen concentration is respectively 8.6g/L and 4.2g/L, and the effluent part can continue on for cleaning cobalt carbonate precipitation,
When concentration is higher than 10 g/L, can continue to repeat the above steps（2）, can reduce by 50% deionized water consumption by the method,
The mother liquor of more high-concentration ammonia-nitrogen is ultimately generated, ammonia nitrogen concentration is 38.8 g/L after testing.
The system of the treatment nitrogen-containing wastewater that the present invention is provided, is respectively equipped with pump, for existing as needed on each pipeline
Transport wastewater between each device, while valve is additionally provided with, the conveying for controlling each pipeline waste water respectively.Due to pump and
Valve belongs to the conventional arrangement in pipeline, therefore does not carry out associated description in accompanying drawing of the present invention and brief description of the drawings part and say
It is bright.
Above example only expresses several embodiments of the invention, and its description is more specific and detailed, but can not
Therefore it is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these are all belonging to protection of the invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of method for processing nitrogen-containing wastewater, described nitrogen-containing wastewater is derived from by ammonium carbonate or ammonium hydrogen carbonate raw material system
The waste water produced during standby metal carbonate, it is characterised in that：
Waste water by ammonia nitrogen concentration more than 20g/L is directly crystallized, and obtains ammonium salt crystal；
Waste water by ammonia nitrogen concentration between 10g/L~20g/L, as dissolving the molten of the ammonium carbonate or ammonium hydrogen carbonate raw material
Solution agent；Or as the lytic agent of the back washing agent for shifting the metal ion in organic phase；Or a part is described as dissolving
The lytic agent of ammonium carbonate or ammonium hydrogen carbonate raw material, remainder is used as the back washing agent for shifting the metal ion in organic phase
Lytic agent；
Ammonia nitrogen concentration is less than the waste water of 10g/L as the cleaning solution of the metal carbonate.
2. it is according to claim 1 treatment nitrogen-containing wastewater method, it is characterised in that：The temperature of described crystallization is 35
~55 DEG C, the time is 1~4h.
3. it is according to claim 1 treatment nitrogen-containing wastewater method, it is characterised in that：Described metal ion be cobalt from
Son, nickel ion, manganese ion, magnesium ion or other can generate the metal ion of carbonate.
4. it is according to claim 1 treatment nitrogen-containing wastewater method, it is characterised in that：In the nitrogen-containing wastewater,
Waste water between 10g/L≤ammonia nitrogen concentration≤13g/L is used as the lytic agent for dissolving the ammonium carbonate or ammonium hydrogen carbonate raw material.
5. it is according to claim 1 treatment nitrogen-containing wastewater method, it is characterised in that：In the nitrogen-containing wastewater,
During 13g/L ＜ ammonia nitrogen concentration ＜ 18g/L, 30%~80% waste water is used as the dissolving for dissolving the ammonium carbonate or ammonium hydrogen carbonate raw material
Agent, remainder as the back washing agent for shifting the metal ion in organic phase lytic agent.
6. it is according to claim 5 treatment nitrogen-containing wastewater method, it is characterised in that：In the nitrogen-containing wastewater,
During 13g/L ＜ ammonia nitrogen concentration ＜ 18g/L, 45%~70% waste water is used as the dissolving for dissolving the ammonium carbonate or ammonium hydrogen carbonate raw material
Agent, remainder as the back washing agent for shifting the metal ion in organic phase lytic agent.
7. it is according to claim 1 treatment nitrogen-containing wastewater method, it is characterised in that：In the nitrogen-containing wastewater,
Waste water between 18g/L≤ammonia nitrogen concentration≤20g/L is used as the molten of the back washing agent for shifting the metal ion in organic phase
Solution agent.
It is 8. a kind of to realize such as the system of the treatment nitrogen-containing wastewater of any one claim methods described in claim 1~7,
It is characterized in that：Including reaction unit, wash mill, crystallization apparatus and back extraction device, the is connected with the reaction unit
One pipeline, is connected with the second pipeline between the reaction unit and the crystallization apparatus, the wash mill and the reaction are filled
The 3rd pipeline is connected between putting, the 4th pipeline, the back extraction are connected between the wash mill and the back extraction device
Take and the 5th pipeline is connected between device and the reaction unit.
9. it is according to claim 8 treatment nitrogen-containing wastewater system, it is characterised in that：Described the first pipeline, second
Pump is respectively arranged with pipeline, the 3rd pipeline, the 4th pipeline and the 5th pipeline.
10. it is according to claim 8 treatment nitrogen-containing wastewater system, it is characterised in that：Described the first pipeline, second
Valve is respectively arranged with pipeline, the 3rd pipeline, the 4th pipeline and the 5th pipeline.
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