CN105417800B - A kind of method that environmental protection removes nitrate nitrogen in waste water - Google Patents
A kind of method that environmental protection removes nitrate nitrogen in waste water Download PDFInfo
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- CN105417800B CN105417800B CN201610010067.2A CN201610010067A CN105417800B CN 105417800 B CN105417800 B CN 105417800B CN 201610010067 A CN201610010067 A CN 201610010067A CN 105417800 B CN105417800 B CN 105417800B
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
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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
- C02F2101/163—Nitrates
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Environmental & Geological Engineering (AREA)
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a kind of method that environmental protection removes nitrate nitrogen in waste water, zinc-silver bimetallic fragment and disodium ethylene diamine tetraacetate are added in waste water, adjusts the pH value of waste water, separation of solid and liquid after stirring reaction, it is standby to collect supernatant；Green vitriol is added in the supernatant of regulation pH value, complexing reduction reaction is carried out under stirring condition, obtains second-stage reduction liquid；Adjust the pH value of second-stage reduction liquid and add sodium sulfite, three-level reduction reaction, filtering are carried out under stirring condition, supernatant is the water for removing nitrate nitrogen.The present invention is a kind of economical and effective chemical denitrification technology, nitrate nitrogen in water is set to be reduced to the harmless object based on nitrogen while nitrate nitrogen clearance in improving water, the pollution of nitrate nitrogen in water is thoroughly eliminated, there is low in raw material price, being compatible with the environment property is good, technical process is simple and convenient to operate, reaction condition is gentle, is suitable for industrialization large-scale production.
Description
Technical field
The invention belongs to Environmental Chemistry technical field, and in particular to a kind of method that environmental protection removes nitrate nitrogen in waste water.
Background technology
Excess nitrate intake body can cause the generation of a variety of diseases such as to cause high ferro hemalbumin disease and induce cancer.
To protect health, China's standard provides that the concentration limit of Nitrate In Drinking Water nitrogen is 20mg/L.To nitrate content height
Waste water and underground water be effectively treated be ensure drinking water quality safety important channel, be this《At China's town sewage
Manage factory's pollutant emission standard》GB18918-2002、《Household refuse landfill sites contamination control standard》GB16889-2008 etc. is marked
The emission limit of total nitrogen is provided in standard.There is a variety of the minimizing technology of nitrate, wherein biological denitrification, ion in water
Exchange and practical application has been put into reverse osmosis process.Although the physical chemistry methods such as ion exchange and reverse osmosis process can be by nitric acid
Salt is separated from waste water or underground water, but the nitrate isolated also faces and solves the problems, such as final outlet.Take people
It is to solve azotate pollution that work mode, which promotes nitrogen to be released into air in the form of nitrogen to recover the balance of nature Nitrogen Cycling,
Fundamental solution.
Biological denitrification and chemical denitrification are two kinds of main methods that nitrate nitrogen in water is reduced to nitrogen.It is although raw
Thing denitrification method obtains practical application in the waste water of easily biological-degradable, but still suffer from complex process, operational management requirement it is high,
The shortcomings of denitrification speed is slow, required reactor volume is huge, it is especially poor to the high water treatment effect containing bio-toxicity.
Compared with biological denitrification, chemical denitrification method has that denitration speed is fast, and technique is simple, and the requirement to operational management is low, fits
For waste water quality scope it is wide the advantages that.Chemical denitrification method is by using reducing agent (energy) or reduction mode, by nitric acid
Salt is reduced to the nitrogen-containing compound of lower valency, so as to reach the purpose for removing nitrate nitrogen in waste water.In chemical denitrification process
In, the selection of the selection of reducing agent on the clearance and reduzate of nitrate nitrogen influence it is very big, therefore, people have developed use
Several reducing agents such as hydrogen, active metal and formic acid, methanol.Wherein, the work using metal simple-substances such as iron, aluminium, zinc as reducing agent
Metal deoxidization is sprinkled to be paid close attention to by some researchers due to the reason such as reducing agent is cheap, reaction speed is fast.But individually
The denitrifying primary product of metal simple-substance be ammonia nitrogen, and need more strictly control pH values.Although people construct
Bimetallic system solves the problems, such as that the control of pH values is difficult to a certain extent, makes denitrification can be with wider pH value range
There is higher activity, but also only be difficult to make the product of reaction by the single reduction process of bimetallic system with harmless nitrogen
Based on.How to efficiently control the reduction process of nitrate nitrogen, both played the advantage of bimetallic system, and can make reaction product with
It is current active metal denitrification method urgent problem based on nitrogen.
The content of the invention
The shortcomings that it is an object of the invention to overcome prior art, there is provided a kind of environmental protection removes the side of nitrate nitrogen in waste water
Method, this method are a kind of economical and effective chemical denitrification technologies, are made while nitrate nitrogen clearance in improving water in water
Nitrate nitrogen is reduced to the harmless object based on nitrogen, thoroughly eliminates the pollution of nitrate nitrogen in water.
The purpose of the present invention is achieved through the following technical solutions：A kind of method that environmental protection removes nitrate nitrogen in waste water,
It comprises the following steps：
S1. primary reduction：Zinc-silver bimetallic fragment and disodium ethylene diamine tetraacetate are added in waste water（EDTA-2Na）, adjust
The pH value of waste water is saved, separation of solid and liquid after stirring reaction, it is standby to collect supernatant；
S2. second-stage reduction：Green vitriol is added in the supernatant of regulation pH value, network is carried out under stirring condition
Reduction reaction is closed, obtains second-stage reduction liquid；
S3. three-level reduces：Adjust the pH value of second-stage reduction liquid and add sodium sulfite, three-level is carried out also under stirring condition
Original reaction, filtering, supernatant are the water for removing nitrate nitrogen.
Further, zinc-silver bimetallic fragment described in step S1 be with silver ion on zinc metal sheet by replacing reactive deposition
Form, in the zinc-silver bimetallic fragment silver-colored content be 0.005~0.01%, a length of 2~4mm of fragment, a width of 0.5~
2mm, thickness 0.1mm, the mass ratio of nitrate nitrogen is 600 in the dosage and waste water of zinc-silver bimetallic fragment:1~1000:1.
Further, the mass ratio of nitrate nitrogen is 10 in the dosage and waste water of EDTA-2Na described in step S1:1~
40:1。
Further, pH value described in step S1 is 2~5, and the temperature of stirring reaction is 15~40 DEG C, the reaction time 1
~4h, mixing speed are 100~200r/min.
Further, the mass ratio of nitrate nitrogen is in the dosage and waste water of green vitriol described in step S2
5:1~15:1.
Further, pH value described in step S2 is 4~7, and the temperature of complex reaction is 15~40 DEG C, the reaction time 10
~50min, mixing speed are 100~200r/min.
Further, the mass ratio of nitrate nitrogen is 10 in the dosage and waste water of sodium sulfite described in step S3:1~
30:1。
Further, the pH value of second-stage reduction liquid described in step S3 is 3~5, and the temperature of reaction is 15~40 DEG C, reaction
Time is 20~50min, and mixing speed is 100~200r/min.
Further, the pH value with sodium hydroxide regulation reaction solution is also included before being filtered described in step S3 to 6~9.
The present invention principle be：Zinc and the silver metal that to be two kinds of electrode potentials different, they are in the solution containing nitrate nitrogen
Galvanic couple galvanic cell can be formed during middle contact, under neutral and solutions of weak acidity, the higher zinc of electrode potential discharges electronics, promotees
Enter the reduction of nitrate nitrogen in solution, while reaction interface, nitrate nitrogen are provided for the reduction of nitrate nitrogen as the silver of negative electrode
Electronics can be directly obtained on its surface to be reduced.In reduction process, EDTA-2Na effect is added：First, caused by can making
With it corrosion of the complex reaction so as to accelerating anode zinc occurs for divalent zinc ion, accelerates the generation of electronics；Second, anodic attack is produced
After raw zinc ion forms complex compound with EDTA, change Zn/Zn () electrode potential so that whole galvanic couple galvanic cell
Control of Electric potentials makes the reduction of nitrate nitrogen control in the nitrite nitrogen stage in optimum range.By selecting silver to be used as catalysis reduction
Negative electrode and control reaction condition（Time, temperature, pH etc.）The reduction process of nitrate nitrogen can also be made to control in nitrite nitrogen
Stage.When ferrous ion is added in solution, with EDTA-2Na complex reaction, the NaFeEDTA complexing of generation occur for ferrous iron
Thing both can make nitrite nitrogen be reduced to NO, and caused NO can again be fixed in solution in the form of EDTA-Fe (II) NO, past
When sodium sulfite is added in the solution after nitrosation reaction, in certain reaction condition（Time, temperature, pH etc.）Under, sulfurous acid
Sodium can react with EDTA-Fe (II) NO, be reduced to nitrogen, reach the purpose for thoroughly going to remove pollution of nitrate nitrogen.Reduction
During main reaction equation it is as follows：
Primary reduction process：
The anode reaction of galvanic couple galvanic cell：Zn→Zn2++2e-, Zn2++ EDTA-2Na→EDTA-Zn()+2Na+
The cathode reaction of galvanic couple galvanic cell：NO3 -+2e-→NO2 -
Fe (II) two level complexing reduction process
Fe(II)+NO2 -+2H+→NO+H2O+ Fe(III)
EDTA-2Na +Fe(II) →EDTA-Fe(II) +2Na+
EDTA-Fe(II)+NO→EDTA-Fe(II)NO
EDTA-Fe(II)+ NO2 -+2H+→NO+H2O+ EDTA-Fe(III)
Na2SO3Three-level reduction reaction：EDTA-Fe(II)NO+ Na2SO3→Na2SO4+N2+ EDTA-Fe(II)
The present invention has advantages below：
（1）Present invention employs the zinc-silver bimetallic of sheet as one-level reducing agent, its preparation technology is simple, the double gold of zinc-silver
Category constitutes galvanic couple galvanic cell in the solution, the galvanic couple galvanic cell potential difference that both metals are formed, can make the reduction of nitrate nitrogen
The nitrite stage is rested on, support is provided for follow-up reduction reaction；
（2）The present invention makees reduction auxiliary agent using EDTA-2Na, can both change the difference in Electrode Potential of zinc-silver, make reduction-state nitrogen master
Will be based on nitrite nitrogen, again can be by being complexed with ferrous iron, EDTA-Fe (II) enhancing Fe (II) the reduction nitrite of generation
The reducing power of nitrogen, while caused NO can be made to be fixed on solution in the form of EDTA-Fe (II) NO again, both reduce NO to air
In release, be Na2SO3Its drastic reduction is provided into guarantee for nitrogen；
（3）The present invention uses galvanic couple galvanic cell, Fe (II) and Na2SO3Make reducing agent, by three-level reduction reaction, make nitric acid
Salt nitrogen is first reduced to nitrite nitrogen, then is reduced to NO by Fe (II), and the NO of generation is absorbed and with EDTA- by EDTA-Fe (II) again
Fe (II) NO forms are fixed in the solution, and EDTA-Fe (II) NO is again by Na2SO3Nitrogen is reduced into, relative to individually active gold
Category and single galvanic couple galvanic cell denitrification method, galvanic couple galvanic cell, Fe (II) and the Na that the present invention uses2SO3Coupling denitrification method
Improve the selectivity that reduction final product is nitrogen；
（4）Low in raw material price that the present invention uses, being compatible with the environment property be good, denitrifying final product is with harmless nitrogen
Based on gas, therefore, the present invention has the characteristics of green, environmentally friendly；
（5）Present invention process process is simple and convenient to operate, reaction condition is gentle, is suitable for industrialization large-scale production.
Embodiment
With reference to embodiment, the present invention will be further described, and protection scope of the present invention is not limited to following institute
State.
Embodiment 1：A kind of method that environmental protection removes nitrate nitrogen in waste water, it comprises the following steps：
S1. primary reduction：Zinc-silver bimetallic fragment and EDTA-2Na are added in waste water, the pH value for adjusting waste water is 2,15
Separation of solid and liquid after DEG C stirring reaction 1h, mixing speed 100r/min, it is standby to collect supernatant；The zinc-silver bimetallic fragment is
Formed with silver ion on zinc metal sheet by replacing reactive deposition, silver-colored content is 0.005% in the zinc-silver bimetallic fragment, broken
A length of 2mm of piece, a width of 0.5mm, thickness 0.1mm, the matter of nitrate nitrogen in the dosage and waste water of zinc-silver bimetallic fragment
Amount is than being 600：1；The mass ratio of nitrate nitrogen is 10 in the dosage and waste water of the EDTA-2Na:1；
S2. second-stage reduction：Green vitriol, green vitriol are added in regulation pH value is 4 supernatant
Dosage and waste water in nitrate nitrogen mass ratio be 5:1, stirred at a temperature of 15 DEG C and carry out complexing reduction reaction
50min, mixing speed 100r/min, obtain second-stage reduction liquid；
S3. three-level reduces：The pH value of regulation second-stage reduction liquid is 3 and adds sodium sulfite, and the dosage of sodium sulfite is
Mass ratio with nitrate nitrogen in waste water is 10:1, the stirring progress three-level reduction reaction 30min at a temperature of 30 DEG C, stirring speed
Spend and filtered, supernatant is the water for removing nitrate nitrogen to 6 for 100r/min, the pH value of hydrogenation sodium oxide molybdena regulation reaction solution.
Embodiment 2：A kind of method that environmental protection removes nitrate nitrogen in waste water, it comprises the following steps：
S1. primary reduction：Zinc-silver bimetallic fragment and EDTA-2Na are added in waste water, the pH value for adjusting waste water is 5,40
Separation of solid and liquid after DEG C stirring reaction 4h, mixing speed 200r/min, it is standby to collect supernatant；The zinc-silver bimetallic fragment is
Formed with silver ion on zinc metal sheet by replacing reactive deposition, silver-colored content is 0.01% in the zinc-silver bimetallic fragment, fragment
A length of 4mm, a width of 2mm, thickness 0.1mm, the mass ratio of nitrate nitrogen in the dosage and waste water of zinc-silver bimetallic fragment
For 1000:1；The mass ratio of nitrate nitrogen is 40 in the dosage and waste water of the EDTA-2Na:1；
S2. second-stage reduction：Green vitriol, green vitriol are added in regulation pH value is 7 supernatant
Dosage and waste water in nitrate nitrogen mass ratio be 15:1, stirred at a temperature of 40 DEG C and carry out complexing reduction reaction
10min, mixing speed 200r/min, obtain second-stage reduction liquid；
S3. three-level reduces：The pH value of regulation second-stage reduction liquid 5 and to add sodium sulfite, the dosage of sodium sulfite with
The mass ratio of nitrate nitrogen is 30 in waste water:1, stirring progress three-level reduction reaction 40min, mixing speed at a temperature of 20 DEG C
For 200r/min, for the pH value of hydrogenation sodium oxide molybdena regulation reaction solution to 9, filtering, supernatant is the water for removing nitrate nitrogen.
Embodiment 3：A kind of method that environmental protection removes nitrate nitrogen in waste water, it comprises the following steps：
S1. primary reduction：Zinc-silver bimetallic fragment and EDTA-2Na are added in waste water, the pH value for adjusting waste water is 3,22
Separation of solid and liquid after DEG C stirring reaction 2.5h, mixing speed 128r/min, it is standby to collect supernatant；The zinc-silver bimetallic fragment
It is to be formed with silver ion on zinc metal sheet by replacing reactive deposition, silver-colored content is 0.006% in the zinc-silver bimetallic fragment,
A length of 2.5mm of fragment, a width of 1mm, thickness 0.1mm, nitrate nitrogen in the dosage and waste water of zinc-silver bimetallic fragment
Mass ratio is 700:1；The mass ratio of nitrate nitrogen is 22 in the dosage and waste water of the EDTA-2Na:1；
S2. second-stage reduction：Green vitriol, green vitriol are added in regulation pH value is 5 supernatant
Dosage and waste water in nitrate nitrogen mass ratio be 8:1, stirred at a temperature of 22 DEG C and carry out complexing reduction reaction
40min, mixing speed 128r/min, obtain second-stage reduction liquid；
S3. three-level reduces：The pH value of regulation second-stage reduction liquid 4 and to add sodium sulfite, the dosage of sodium sulfite with
The mass ratio of nitrate nitrogen is 18 in waste water:1, stirring progress three-level reduction reaction 28min, mixing speed at a temperature of 40 DEG C
For 128r/min, for the pH value of hydrogenation sodium oxide molybdena regulation reaction solution to 7, filtering, supernatant is the water for removing nitrate nitrogen.
Embodiment 4：A kind of method that environmental protection removes nitrate nitrogen in waste water, it comprises the following steps：
S1. primary reduction：Zinc-silver bimetallic fragment and EDTA-2Na are added in waste water, the pH value for adjusting waste water is 4.5,
Separation of solid and liquid after 35 DEG C of stirring reaction 3.5h, mixing speed 180r/min, it is standby to collect supernatant；The zinc-silver bimetallic is broken
Piece is to be formed with silver ion on zinc metal sheet by replacing reactive deposition, and silver-colored content is in the zinc-silver bimetallic fragment
0.008%, a length of 3.5mm of fragment, a width of 1.6mm, thickness 0.1mm, nitre in the dosage and waste water of zinc-silver bimetallic fragment
The mass ratio of hydrochlorate nitrogen is 800:1；The mass ratio of nitrate nitrogen is 35 in the dosage and waste water of the EDTA-2Na:1；
S2. second-stage reduction：Green vitriol, green vitriol are added in regulation pH value is 6 supernatant
Dosage and waste water in nitrate nitrogen mass ratio be 13:1, stirred at a temperature of 36 DEG C and carry out complexing reduction reaction
20min, mixing speed 180r/min, obtain second-stage reduction liquid；
S3. three-level reduces：The pH value of regulation second-stage reduction liquid is 4.5 and adds sodium sulfite, the dosage of sodium sulfite
Mass ratio with nitrate nitrogen in waste water is 26:1, the stirring progress three-level reduction reaction 35min at a temperature of 35 DEG C, stirring speed
Spend and filtered, supernatant is the water for removing nitrate nitrogen to 8 for 180r/min, the pH value of hydrogenation sodium oxide molybdena regulation reaction solution.
Experimental example 1：
Certain percolate film-filter concentration liquid, nitrate nitrogen, nitrite nitrogen, ammonia-nitrogen content are respectively 40mg/ in raw water
L, 200mg/L, 182mg/L, raw sewage pre-process nitrate nitrogen, nitrite nitrogen, ammonia in water outlet after wet oxidation pre-processes
Nitrogen content is respectively 60mg/L, 0.17mg/L, 1.6mg/L, and this pretreatment water outlet 1L is collected in the container 1 of 2L acid and alkali-resistances,
The zinc-silver bimetallic fragment that silver content is 0.007% is added into container 1（A length of 2mm of fragment, a width of 0.5mm, thickness are
0.1mm）43.3g, the EDTA-2Na solution 13ml that mass fraction is 11% are added, with the pH to 3 of first acid-conditioning solution, at 20 DEG C
Lower progress nitrosation reduction reaction 120min, nitrosation reduction reaction water outlet is collected to volume as 2L and the container 2 of acid and alkali-resistance
In, 0.4g green vitriols, temperature and stirring condition at 20 DEG C are added into container 2（Stir speed (S.S.) is 150r/min)
Under carry out being complexed reduction reaction 40min；After complex reaction terminates, Na is added into container 22SO31.11g, regulation wastewater pH are
4.2, temperature and stirring condition at 20 DEG C（Rotating speed is 150r/min) under carry out three-level reduction reaction 30min, then adjusted with NaOH
The pH value for saving three-level reduction reaction water outlet is 6.0, and separation of solid and liquid, supernatant is water outlet.Nitrate nitrogen, Asia in measure processing water outlet
Content difference 0mg/L, the 0mg/L of nitrate nitrogen, ammonia nitrogen, 5mg/L, the clearance of nitrate nitrogen reach 100%, chemical denitrification
The selection rate of non-ammonia nitrogen reaches more than 95% in final product.
Experimental example 2：
Certain town domestic sewage, COD, nitrate nitrogen, nitrite nitrogen, ammonia-nitrogen content are respectively 260mg/L in raw water,
2mg/L, 0.5mg/L, 40mg/L, raw sewage is after biological contact oxidization treatment, nitrate nitrogen, nitrous acid in biological treatment water outlet
Salt nitrogen, ammonia-nitrogen content are respectively that content is 35.5mg/L, 0mg/L, 1.8mg/L, pH 6, biological treatment water outlet 1L are collected to
In the container 1 of 2L acid and alkali-resistance, the zinc-silver bimetallic fragment that silver content is 0.008% is added into container 1（Fragment it is a length of
3mm, a width of 0.5mm, thickness 0.1mm）23g, the EDTA-2Na solution 8ml that mass fraction is 11% are added, are adjusted with formic acid
The pH of solution to 4.1, nitrosation reduction reaction 60min is carried out at a temperature of 30 DEG C, nitrosation reduction reaction water outlet is collected
To volume in the container 2 of 2L and acid and alkali-resistance, to adjust wastewater pH, the addition 0.3g green vitriols into container 2, at 30 DEG C
Temperature and stirring condition（Stir speed (S.S.) is 150r/min) under carry out being complexed reduction reaction 30min；It is past after complex reaction terminates
Na is added in container 22SO30.67g, regulation wastewater pH are 4, temperature and stirring condition at 30 DEG C（Rotating speed is 150r/min) under
Carry out three-level reduction reaction 40min, then it is 6 to adjust the pH value of three-level reduction reaction water outlet with NaOH, separation of solid and liquid, supernatant is
Water outlet.Content the difference 0mg/L, 0.1mg/L, 3.3mg/L of nitrate nitrogen, nitrite nitrogen, ammonia nitrogen, nitre in measure processing water outlet
The clearance of hydrochlorate nitrogen reaches 100%, and the selection rate of non-ammonia nitrogen reaches more than 95% in chemical denitrification final product.
Claims (8)
1. a kind of method that environmental protection removes nitrate nitrogen in waste water, it is characterised in that it comprises the following steps：
S1. primary reduction：Zinc-silver bimetallic fragment and disodium ethylene diamine tetraacetate are added in waste water, the pH value of waste water is adjusted, stirs
Separation of solid and liquid after reacting is mixed, it is standby to collect supernatant；
S2. second-stage reduction：Green vitriol is added in the supernatant of regulation pH value, under stirring condition be complexed also
Original reaction, obtains second-stage reduction liquid；
S3. three-level reduces：Adjust the pH value of second-stage reduction liquid and add sodium sulfite, it is anti-that three-level reduction is carried out under stirring condition
Should, filtering, supernatant is the water for removing nitrate nitrogen；
Wherein, zinc-silver bimetallic fragment described in step S1 is to be formed with silver ion on zinc metal sheet by replacing reactive deposition, institute
It is 0.005~0.01% to state content silver-colored in zinc-silver bimetallic fragment, a length of 2~4mm of fragment, a width of 0.5~2mm, and thickness is
0.1mm, the mass ratio of nitrate nitrogen is 600 in the dosage and waste water of zinc-silver bimetallic fragment:1~1000:1.
2. the method that a kind of environmental protection as claimed in claim 1 removes nitrate nitrogen in waste water, it is characterised in that institute in step S1
The mass ratio for stating nitrate nitrogen in the dosage and waste water of disodium ethylene diamine tetraacetate is 10:1~40:1.
3. the method that a kind of environmental protection as claimed in claim 1 removes nitrate nitrogen in waste water, it is characterised in that institute in step S1
It is 2~5 to state pH value, and the temperature of stirring reaction is 15~40 DEG C, and the reaction time is 1~4h, and mixing speed is 100~200r/
min。
4. the method that a kind of environmental protection as claimed in claim 1 removes nitrate nitrogen in waste water, it is characterised in that institute in step S2
The mass ratio for stating nitrate nitrogen in the dosage and waste water of green vitriol is 5:1~15:1.
5. the method that a kind of environmental protection as claimed in claim 1 removes nitrate nitrogen in waste water, it is characterised in that institute in step S2
PH value is stated as 4~7, the temperature of complex reaction is 15~40 DEG C, and the reaction time be 10~50min, mixing speed for 100~
200r/min。
6. the method that a kind of environmental protection as claimed in claim 1 removes nitrate nitrogen in waste water, it is characterised in that institute in step S3
The mass ratio for stating nitrate nitrogen in the dosage and waste water of sodium sulfite is 10:1~30:1.
7. the method that a kind of environmental protection as claimed in claim 1 removes nitrate nitrogen in waste water, it is characterised in that institute in step S3
The pH value for stating second-stage reduction liquid is 3~5, and the temperature of reaction is 15~40 DEG C, and the reaction time is 20~50min, and mixing speed is
100~200r/min.
8. the method that a kind of environmental protection as claimed in claim 1 removes nitrate nitrogen in waste water, it is characterised in that institute in step S3
Also include the pH value with sodium hydroxide regulation reaction solution to 6~9 before stating filtering.
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| CN111196664B (en) * | 2020-01-16 | 2021-06-29 | 广东晟鑫环保科技有限公司 | Wastewater desalting treatment method based on advanced treatment |
| CN111484117B (en) * | 2020-04-17 | 2022-06-28 | 无锡中天固废处置有限公司 | Method and device for reducing nitrate radical in acid solution |
| CN114085008B (en) * | 2021-12-07 | 2023-04-07 | 中原环保股份有限公司 | Environment-friendly method treatment process of ammonium nitrate condensation wastewater |
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| JP4532967B2 (en) * | 2004-04-08 | 2010-08-25 | 英雄 早川 | How to remove nitrate nitrogen |
| CN103964550A (en) * | 2014-05-24 | 2014-08-06 | 长安大学 | Method for removing nitrate nitrogen in water body |
| CN104891722B (en) * | 2015-06-19 | 2016-11-30 | 四川师范大学 | A kind of remove the method for nitrate nitrogen in waste water |
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2016
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Effective date of registration: 20181213 Address after: 610041, 24th Floor, New Hope International C Block, No. 8, Jitai No. 3 Road, Chengdu High-tech Zone, Sichuan Province (1-8) Patentee after: Deepblue Environmental Protection Technologies Co., Ltd. Address before: 610068 No. 5 Jing'an Road, Jinjiang District, Chengdu City, Sichuan Province Patentee before: Sichuan Normal University |