CN105417800A - Environment-friendly method for removing nitrate nitrogen in waste water - Google Patents
Environment-friendly method for removing nitrate nitrogen in waste water Download PDFInfo
- Publication number
- CN105417800A CN105417800A CN201610010067.2A CN201610010067A CN105417800A CN 105417800 A CN105417800 A CN 105417800A CN 201610010067 A CN201610010067 A CN 201610010067A CN 105417800 A CN105417800 A CN 105417800A
- Authority
- CN
- China
- Prior art keywords
- waste water
- nitrate nitrogen
- reaction
- reduction
- nitrogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
Abstract
The invention discloses an environment-friendly method for removing nitrate nitrogen in waste water. Zinc and silver dual-metal fragments and disodium ethylenediaminetetraacetate dihydrate are added in the waste water, the pH value of the waste water is adjusted, solid and liquid separation is performed after a stirring reaction, and supernatant liquid is collected for standby use; ferrous sulfate heptahydrate is added into the supernatant liquid where the pH value is adjusted, a complexing reduction reaction is performed under the stirring condition, and second-level reduction liquid is obtained; the pH value of the second-level reduction liquid is adjusted, sodium sulfite is added, a third-level reaction is performed under a stirring condition, filtration is performed, and supernatant liquid is water with nitrate removed. The method is an economical and effective chemical denitrification technology, nitrate nitrogen in water is reduced into harmless matter mainly composed of nitrogen while the removing rate of nitrate nitrogen in water is increased, pollution of nitrate nitrogen in water is thoroughly eliminated, and the method has the advantages that the raw materials are low in price, environment compatibility is good, the technological process is simple, operation is convenient, reaction conditions are mild, and the method is suitable for industrial large-scale production.
Description
Technical field
The invention belongs to environmental chemistry technical field, be specifically related to a kind of method that nitrate nitrogen in waste water is removed in environmental protection.
Background technology
Excess nitrate is taken in body and the generation of various diseases can be caused as caused siderosis albumen disease and bringing out cancer etc.For protection HUMAN HEALTH, China's standard specifies that the concentration limit of Nitrate In Drinking Water nitrogen is 20mg/L.It is the important channel ensureing drinking-water quality safety that the waste water high to nitrate content and underground water carry out effectively process, specifies in the standard such as " China's urban wastewater treatment firm pollutant emission standard " GB18918-2002, " household refuse landfill sites Environmental capacity standard " GB16889-2008 to the emission limit of total nitrogen for this reason.In water, the minimizing technology of nitrate has multiple, and wherein biological denitrification, ion-exchange and reverse osmosis process drop into practical application.Although nitrate can be separated by the physical chemistry method such as ion-exchange and reverse osmosis process from waste water or underground water, isolated nitrate is also faced with the problem solving final outlet.Nitrogen is released into air to recover the fundamental solution that the balance of nature Nitrogen Cycling is solution azotate pollution with nitrogen form to take manual type to promote.
Biological denitrification and chemical denitrification are two kinds of main method nitrate nitrogen in water being reduced to nitrogen.Although biological denitrification method obtains practical application in the waste water of readily biodegradable, but still there is the shortcomings such as complex process, operational management requirement is high, slow, the required reactor volume of denitrification speed is huge, the water treatment effect especially to high containing bio-toxicity is poor.Compared with biological denitrification, it is fast that chemical denitrification method has denitration speed, and technique is simple, low to the requirement of operational management, the advantages such as the waste water quality scope be applicable to is wide.Chemical denitrification method is by using reductive agent (energy) or reduction mode, being the nitrogenous compound of lower valency, thus reaching the object removing nitrate nitrogen in waste water by nitrate reduction.In chemical denitrification process, the selection impact of selection on the clearance of nitrate nitrogen and reduzate of reductive agent is very big, and for this reason, people have developed and adopt hydrogen, active metal and several reductive agents such as formic acid, methyl alcohol.Wherein, receive the concern of some investigators due to reasons such as reductive agent are cheap, speed of response is fast with the metal simple-substances such as iron, aluminium, the zinc active metal reduction method that is reductive agent.But the denitrifying primary product of independent metal simple-substance is ammonia nitrogen, and need more strictly control ph.Although people construct bimetallic system and to some extent solve the problem that pH value controls difficulty, make denitrification can have higher activity in wider pH value range, but only be also difficult to make the product of reaction based on harmless nitrogen by the single reduction process of bimetallic system.How effectively to control the reduction process of nitrate nitrogen, both played the advantage of bimetallic system, it is current active metal denitrification method urgent problem that reaction product can be made again to take nitrogen as master.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, a kind of environmental protection is provided to remove the method for nitrate nitrogen in waste water, the method is a kind of economic, effective chemical denitrification technology, nitrate nitrogen in water is made to be reduced to harmless object based on nitrogen while nitrate nitrogen clearance improving in water, the thoroughly pollution of nitrate nitrogen in elimination water.
Object of the present invention is achieved through the following technical solutions: the method for nitrate nitrogen in waste water is removed in a kind of environmental protection, and it comprises the following steps:
S1. primary reduction: add zinc-silver bimetal fragment and disodium ethylene diamine tetraacetate (EDTA-2Na) in waste water, regulates the pH value of waste water, solid-liquid separation after stirring reaction, collects supernatant liquor for subsequent use;
S2. second-stage reduction: add ferrous sulfate in the supernatant liquor of adjust ph, carries out complexing reduction reaction under agitation condition, obtains second-stage reduction liquid;
S3. three grades of reduction: regulate the pH value of second-stage reduction liquid and add S-WAT, carrying out three grades of reduction reactions under agitation condition, filter, and supernatant liquor is the water removing nitrate nitrogen.
Further, the bimetal of zinc-silver described in step S1 fragment is formed by replacement(metathesis)reaction deposition on zinc metal sheet with silver ions, in described zinc-silver bimetal fragment, the content of silver is 0.005 ~ 0.01%, the length of fragment is 2 ~ 4mm, wide is 0.5 ~ 2mm, thickness is 0.1mm, and in the dosage of zinc-silver bimetal fragment and waste water, the mass ratio of nitrate nitrogen is 600:1 ~ 1000:1.
Further, in the dosage of EDTA-2Na described in step S1 and waste water, the mass ratio of nitrate nitrogen is 10:1 ~ 40:1.
Further, pH value described in step S1 is 2 ~ 5, and the temperature of stirring reaction is 15 ~ 40 DEG C, and the reaction times is 1 ~ 4h, and stirring velocity is 100 ~ 200r/min.
Further, in the dosage of ferrous sulfate described in step S2 and waste water, the mass ratio of nitrate nitrogen is 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, and the reaction times is 10 ~ 50min, and stirring velocity is 100 ~ 200r/min.
Further, in the dosage of S-WAT described in step S3 and waste water, the mass ratio of nitrate nitrogen is 10:1 ~ 30:1.
Further, the pH value of the liquid of second-stage reduction described in step S3 is 3 ~ 5, and the temperature of reaction is 15 ~ 40 DEG C, and the reaction times is 20 ~ 50min, and stirring velocity is 100 ~ 200r/min.
Further, pH value to 6 ~ 9 regulating reaction solution with sodium hydroxide are also comprised before filtering described in step S3.
Principle of the present invention is: zinc and silver are the different metals of two kinds of electropotentials, they can form galvanic couple galvanic cell when contacting in the solution containing nitrate nitrogen, under neutrality and solutions of weak acidity, the zinc that electropotential is higher discharges electronics, promote the reduction of nitrate nitrogen in solution, the reduction being simultaneously nitrate nitrogen as the silver of negative electrode provides reaction interface, and nitrate nitrogen can directly obtain electronics on its surface and be reduced.In reduction process, add the effect of EDTA-2Na: one be can make the divalent zinc ion of generation and it there is complex reaction thus the corrosion of accelerating anode zinc, accelerate the generation of electronics; Two is zine ions of producing of anodic corrosion and after EDTA forms complex compound, change Zn/Zn (
) electropotential, thus make the control of Electric potentials of whole galvanic couple galvanic cell at optimum range, the reduction of nitrate nitrogen controlled in the nitrite nitrogen stage.Also the reduction process of nitrate nitrogen can be made by selecting silver to control in the nitrite nitrogen stage as catalytic reduction negative electrode and control reaction conditions (time, temperature, pH etc.).When ferrous ion joins in solution, there is complex reaction in ferrous iron and EDTA-2Na, the NaFeEDTA complex compound generated both can make nitrite nitrogen be reduced to NO, the NO of generation can be made again to be fixed in the solution with the form of EDTA-Fe (II) NO, when adding S-WAT in the solution after nitrosation reaction, under certain reaction conditions (time, temperature, pH etc.), S-WAT can react with EDTA-Fe (II) NO, be reduced to nitrogen, reached the object thoroughly removing to remove pollution of nitrate nitrogen.Reaction formula main in reduction process is as follows:
Primary reduction process:
The anodic reaction of galvanic couple galvanic cell: Zn → Zn
2++ 2e
-, Zn
2++ EDTA-2Na → EDTA-Zn (
)+2Na
+
The cathodic reaction of galvanic couple galvanic cell: NO
3 -+ 2e
-→ NO
2 -
The secondary complexing reduction process of Fe (II)
Fe(II)+NO
2 -+2H
+→NO+H
2O+Fe(III)
EDTA-2Na+Fe(II)→EDTA-Fe(II)+2Na
+
EDTA-Fe(II)+NO→EDTA-Fe(II)NO
EDTA-Fe(II)+NO
2 -+2H
+→NO+H
2O+EDTA-Fe(III)
Na
2sO
3three grades of reduction reaction: EDTA-Fe (II) NO+Na
2sO
3→ Na
2sO
4+ N
2+ EDTA-Fe (II)
The present invention has the following advantages:
(1) present invention employs the zinc-silver bimetal of sheet as one-level reductive agent, its preparation technology is simple, zinc-silver bimetal constitutes galvanic couple galvanic cell in the solution, the galvanic couple galvanic cell potential difference that these two kinds of metals are formed, the reduction of nitrate nitrogen can be made to rest on the nitrite stage, for follow-up reduction reaction provides support;
(2) the present invention adopts EDTA-2Na to make reduction auxiliary agent, both the difference in Electrode Potential of zinc-silver can have been changed, make reduction-state nitrogen mainly based on nitrite nitrogen, again by with ferrous iron complexing, the EDTA-Fe (II) generated strengthens Fe (II) and reduces the reducing power of nitrite nitrogen, the NO of generation can be made again to be fixed on solution with EDTA-Fe (II) NO form, both having decreased NO to the release in air, is Na simultaneously
2sO
3be that nitrogen provides guarantee by its drastic reduction;
(3) the present invention adopts galvanic couple galvanic cell, Fe (II) and Na
2sO
3make reductive agent, by three grades of reduction reactions, nitrate nitrogen is made first to be reduced to nitrite nitrogen, NO is reduced to again by Fe (II), the NO generated is absorbed by EDTA-Fe (II) again and fixes in the solution with EDTA-Fe (II) NO form, and EDTA-Fe (II) NO is again by Na
2sO
3be reduced into nitrogen, relative to independent active metal and independent galvanic couple galvanic cell denitrification method, galvanic couple galvanic cell, Fe (II) and Na that the present invention adopts
2sO
3it is the selectivity of nitrogen that coupling denitrification method improves reduction final product;
(4) the present invention adopt low in raw material price, with good, the denitrifying final product of Environmental compatibility based on harmless nitrogen, therefore, the present invention has the feature of green, environmental protection;
(5) present invention process process is simple, easy to operate, reaction conditions is gentle, be suitable for industrialization scale operation.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, and protection scope of the present invention is not limited to the following stated.
Embodiment 1: the method for nitrate nitrogen in waste water is removed in a kind of environmental protection, and it comprises the following steps:
S1. primary reduction: add zinc-silver bimetal fragment and EDTA-2Na in waste water, the pH value regulating waste water is solid-liquid separation after 2,15 DEG C of stirring reaction 1h, and stirring velocity is 100r/min, collects supernatant liquor for subsequent use; Described zinc-silver bimetal fragment is formed by replacement(metathesis)reaction deposition on zinc metal sheet with silver ions, in described zinc-silver bimetal fragment, the content of silver is 0.005%, the length of fragment is 2mm, wide is 0.5mm, thickness is 0.1mm, and in the dosage of zinc-silver bimetal fragment and waste water, the mass ratio of nitrate nitrogen is 600:1; In the dosage of described EDTA-2Na and waste water, the mass ratio of nitrate nitrogen is 10:1;
S2. second-stage reduction: be add ferrous sulfate in the supernatant liquor of 4 in adjust ph, in the dosage of ferrous sulfate and waste water, the mass ratio of nitrate nitrogen is 5:1, stir at the temperature of 15 DEG C and carry out complexing reduction reaction 50min, stirring velocity is 100r/min, obtains second-stage reduction liquid;
S3. three grades of reduction: regulate the pH value of second-stage reduction liquid be 3 and add S-WAT, the dosage of S-WAT is be 10:1 with the mass ratio of nitrate nitrogen in waste water, stir at the temperature of 30 DEG C and carry out three grades of reduction reaction 30min, stirring velocity is 100r/min, hydro-oxidation sodium regulates the pH value to 6 of reaction solution, filter, supernatant liquor is the water removing nitrate nitrogen.
Embodiment 2: the method for nitrate nitrogen in waste water is removed in a kind of environmental protection, and it comprises the following steps:
S1. primary reduction: add zinc-silver bimetal fragment and EDTA-2Na in waste water, the pH value regulating waste water is solid-liquid separation after 5,40 DEG C of stirring reaction 4h, and stirring velocity is 200r/min, collects supernatant liquor for subsequent use; Described zinc-silver bimetal fragment is formed by replacement(metathesis)reaction deposition on zinc metal sheet with silver ions, in described zinc-silver bimetal fragment, the content of silver is 0.01%, the length of fragment is 4mm, wide is 2mm, thickness is 0.1mm, and in the dosage of zinc-silver bimetal fragment and waste water, the mass ratio of nitrate nitrogen is 1000:1; In the dosage of described EDTA-2Na and waste water, the mass ratio of nitrate nitrogen is 40:1;
S2. second-stage reduction: be add ferrous sulfate in the supernatant liquor of 7 in adjust ph, in the dosage of ferrous sulfate and waste water, the mass ratio of nitrate nitrogen is 15:1, stir at the temperature of 40 DEG C and carry out complexing reduction reaction 10min, stirring velocity is 200r/min, obtains second-stage reduction liquid;
S3. three grades of reduction: regulate the pH value of second-stage reduction liquid be 5 and add S-WAT, in the dosage of S-WAT and waste water, the mass ratio of nitrate nitrogen is 30:1, stir at the temperature of 20 DEG C and carry out three grades of reduction reaction 40min, stirring velocity is 200r/min, hydro-oxidation sodium regulates the pH value to 9 of reaction solution, filter, supernatant liquor is the water removing nitrate nitrogen.
Embodiment 3: the method for nitrate nitrogen in waste water is removed in a kind of environmental protection, and it comprises the following steps:
S1. primary reduction: add zinc-silver bimetal fragment and EDTA-2Na in waste water, the pH value regulating waste water is solid-liquid separation after 3,22 DEG C of stirring reaction 2.5h, and stirring velocity is 128r/min, collects supernatant liquor for subsequent use; Described zinc-silver bimetal fragment is formed by replacement(metathesis)reaction deposition on zinc metal sheet with silver ions, in described zinc-silver bimetal fragment, the content of silver is 0.006%, the length of fragment is 2.5mm, wide is 1mm, thickness is 0.1mm, and in the dosage of zinc-silver bimetal fragment and waste water, the mass ratio of nitrate nitrogen is 700:1; In the dosage of described EDTA-2Na and waste water, the mass ratio of nitrate nitrogen is 22:1;
S2. second-stage reduction: be add ferrous sulfate in the supernatant liquor of 5 in adjust ph, in the dosage of ferrous sulfate and waste water, the mass ratio of nitrate nitrogen is 8:1, stir at the temperature of 22 DEG C and carry out complexing reduction reaction 40min, stirring velocity is 128r/min, obtains second-stage reduction liquid;
S3. three grades of reduction: regulate the pH value of second-stage reduction liquid be 4 and add S-WAT, in the dosage of S-WAT and waste water, the mass ratio of nitrate nitrogen is 18:1, stir at the temperature of 40 DEG C and carry out three grades of reduction reaction 28min, stirring velocity is 128r/min, hydro-oxidation sodium regulates the pH value to 7 of reaction solution, filter, supernatant liquor is the water removing nitrate nitrogen.
Embodiment 4: the method for nitrate nitrogen in waste water is removed in a kind of environmental protection, and it comprises the following steps:
S1. primary reduction: add zinc-silver bimetal fragment and EDTA-2Na in waste water, the pH value regulating waste water is solid-liquid separation after 4.5,35 DEG C of stirring reaction 3.5h, and stirring velocity is 180r/min, collects supernatant liquor for subsequent use; Described zinc-silver bimetal fragment is formed by replacement(metathesis)reaction deposition on zinc metal sheet with silver ions, in described zinc-silver bimetal fragment, the content of silver is 0.008%, the length of fragment is 3.5mm, wide is 1.6mm, thickness is 0.1mm, and in the dosage of zinc-silver bimetal fragment and waste water, the mass ratio of nitrate nitrogen is 800:1; In the dosage of described EDTA-2Na and waste water, the mass ratio of nitrate nitrogen is 35:1;
S2. second-stage reduction: be add ferrous sulfate in the supernatant liquor of 6 in adjust ph, in the dosage of ferrous sulfate and waste water, the mass ratio of nitrate nitrogen is 13:1, stir at the temperature of 36 DEG C and carry out complexing reduction reaction 20min, stirring velocity is 180r/min, obtains second-stage reduction liquid;
S3. three grades of reduction: regulate the pH value of second-stage reduction liquid be 4.5 and add S-WAT, in the dosage of S-WAT and waste water, the mass ratio of nitrate nitrogen is 26:1, stir at the temperature of 35 DEG C and carry out three grades of reduction reaction 35min, stirring velocity is 180r/min, hydro-oxidation sodium regulates the pH value to 8 of reaction solution, filter, supernatant liquor is the water removing nitrate nitrogen.
Experimental example 1:
Certain percolate film-filter concentration liquid, nitrate nitrogen in former water, nitrite nitrogen, ammonia-nitrogen content is respectively 40mg/L, 200mg/L, 182mg/L, raw waste water is after wet oxidation pre-treatment, nitrate nitrogen in pre-treatment water outlet, nitrite nitrogen, ammonia-nitrogen content is respectively 60mg/L, 0.17mg/L, 1.6mg/L, this pre-treatment water outlet 1L is collected in the container 1 of 2L acid and alkali-resistance, add in container 1 silver content be 0.007% zinc-silver bimetal fragment (length of fragment is 2mm, wide is 0.5mm, thickness is 0.1mm) 43.3g, add the EDTA-2Na solution 13ml that massfraction is 11%, with the pH to 3 of formic acid regulator solution, nitrosification reduction reaction 120min is carried out at 20 DEG C, the water outlet of nitrosification reduction reaction is collected to volume and is 2L and in the container 2 of acid and alkali-resistance, 0.4g ferrous sulfate is added in container 2, complexing reduction reaction 40min is carried out at the temperature of 20 DEG C and agitation condition (stir speed (S.S.) is 150r/min), after complex reaction terminates, in container 2, add Na
2sO
31.11g, regulate wastewater pH to be 4.2, at the temperature of 20 DEG C and agitation condition (rotating speed is 150r/min), carry out three grades of reduction reaction 30min, then regulate the pH value of three grades of reduction reaction water outlets to be 6.0 with NaOH, solid-liquid separation, supernatant liquor is water outlet.Measure content difference 0mg/L, 0mg/L, the 5mg/L of nitrate nitrogen, nitrite nitrogen, ammonia nitrogen in process water outlet, the clearance of nitrate nitrogen reaches 100%, in chemical denitrification final product, the selection rate of non-ammonia nitrogen reaches more than 95%.
Experimental example 2:
Certain town domestic sewage, COD in former water, nitrate nitrogen, nitrite nitrogen, ammonia-nitrogen content is respectively 260mg/L, 2mg/L, 0.5mg/L, 40mg/L, raw waste water is after biological contact oxidization treatment, nitrate nitrogen in biological treatment water outlet, nitrite nitrogen, it is 35.5mg/L that ammonia-nitrogen content is respectively content, 0mg/L, 1.8mg/L, pH is 6, biological treatment water outlet 1L is collected in the container 1 of the acid and alkali-resistance of 2L, add in container 1 silver content be 0.008% zinc-silver bimetal fragment (length of fragment is 3mm, wide is 0.5mm, thickness is 0.1mm) 23g, add the EDTA-2Na solution 8ml that massfraction is 11%, with the pH to 4.1 of formic acid regulator solution, nitrosification reduction reaction 60min is carried out at the temperature of 30 DEG C, the water outlet of nitrosification reduction reaction is collected to volume and is 2L and in the container 2 of acid and alkali-resistance, regulate wastewater pH, 0.3g ferrous sulfate is added in container 2, complexing reduction reaction 30min is carried out at the temperature of 30 DEG C and agitation condition (stir speed (S.S.) is 150r/min), after complex reaction terminates, in container 2, add Na
2sO
30.67g, regulate wastewater pH to be 4, at the temperature of 30 DEG C and agitation condition (rotating speed is 150r/min), carry out three grades of reduction reaction 40min, then regulate the pH value of three grades of reduction reaction water outlets to be 6 with NaOH, solid-liquid separation, supernatant liquor is water outlet.Measure content 0mg/L, 0.1mg/L, the 3.3mg/L respectively of nitrate nitrogen, nitrite nitrogen, ammonia nitrogen in process water outlet, the clearance of nitrate nitrogen reaches 100%, and in chemical denitrification final product, the selection rate of non-ammonia nitrogen reaches more than 95%.
Claims (9)
1. a method for nitrate nitrogen in waste water is removed in environmental protection, and it is characterized in that, it comprises the following steps:
S1. primary reduction: add zinc-silver bimetal fragment and disodium ethylene diamine tetraacetate in waste water, regulates the pH value of waste water, solid-liquid separation after stirring reaction, collects supernatant liquor for subsequent use;
S2. second-stage reduction: add ferrous sulfate in the supernatant liquor of adjust ph, carries out complexing reduction reaction under agitation condition, obtains second-stage reduction liquid;
S3. three grades of reduction: regulate the pH value of second-stage reduction liquid and add S-WAT, carrying out three grades of reduction reactions under agitation condition, filter, and supernatant liquor is the water removing nitrate nitrogen.
2. the method for nitrate nitrogen in waste water is removed in a kind of environmental protection as claimed in claim 1, it is characterized in that, the bimetal of zinc-silver described in step S1 fragment is formed by replacement(metathesis)reaction deposition on zinc metal sheet with silver ions, in described zinc-silver bimetal fragment, the content of silver is 0.005 ~ 0.01%, the length of fragment is 2 ~ 4mm, wide is 0.5 ~ 2mm, and thickness is 0.1mm, and in the dosage of zinc-silver bimetal fragment and waste water, the mass ratio of nitrate nitrogen is 600:1 ~ 1000:1.
3. the method for nitrate nitrogen in waste water is removed in a kind of environmental protection as claimed in claim 1, it is characterized in that, in the dosage of disodium ethylene diamine tetraacetate described in step S1 and waste water, the mass ratio of nitrate nitrogen is 10:1 ~ 40:1.
4. the method for nitrate nitrogen in waste water is removed in a kind of environmental protection as claimed in claim 1, and it is characterized in that, pH value described in step S1 is 2 ~ 5, and the temperature of stirring reaction is 15 ~ 40 DEG C, and the reaction times is 1 ~ 4h, and stirring velocity is 100 ~ 200r/min.
5. the method for nitrate nitrogen in waste water is removed in a kind of environmental protection as claimed in claim 1, it is characterized in that, in the dosage of ferrous sulfate described in step S2 and waste water, the mass ratio of nitrate nitrogen is 5:1 ~ 15:1.
6. the method for nitrate nitrogen in waste water is removed in a kind of environmental protection as claimed in claim 1, and it is characterized in that, pH value described in step S2 is 4 ~ 7, and the temperature of complex reaction is 15 ~ 40 DEG C, and the reaction times is 10 ~ 50min, and stirring velocity is 100 ~ 200r/min.
7. the method for nitrate nitrogen in waste water is removed in a kind of environmental protection as claimed in claim 1, it is characterized in that, in the dosage of S-WAT described in step S3 and waste water, the mass ratio of nitrate nitrogen is 10:1 ~ 30:1.
8. the method for nitrate nitrogen in waste water is removed in a kind of environmental protection as claimed in claim 1, it is characterized in that, the pH value of the liquid of second-stage reduction described in step S3 is 3 ~ 5, and the temperature of reaction is 15 ~ 40 DEG C, reaction times is 20 ~ 50min, and stirring velocity is 100 ~ 200r/min.
9. the method for nitrate nitrogen in waste water is removed in a kind of environmental protection as claimed in claim 1, it is characterized in that, also comprises pH value to 6 ~ 9 regulating reaction solution with sodium hydroxide described in step S3 before filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610010067.2A CN105417800B (en) | 2016-01-08 | 2016-01-08 | A kind of method that environmental protection removes nitrate nitrogen in waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610010067.2A CN105417800B (en) | 2016-01-08 | 2016-01-08 | A kind of method that environmental protection removes nitrate nitrogen in waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105417800A true CN105417800A (en) | 2016-03-23 |
| CN105417800B CN105417800B (en) | 2017-11-21 |
Family
ID=55496420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610010067.2A Active CN105417800B (en) | 2016-01-08 | 2016-01-08 | A kind of method that environmental protection removes nitrate nitrogen in waste water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105417800B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111196664A (en) * | 2020-01-16 | 2020-05-26 | 广东晟鑫环保科技有限公司 | Wastewater desalting treatment method based on advanced treatment |
| CN111484117A (en) * | 2020-04-17 | 2020-08-04 | 无锡中天固废处置有限公司 | Method and device for reducing nitrate radical in acid solution |
| CN114085008A (en) * | 2021-12-07 | 2022-02-25 | 中原环保股份有限公司 | Environment-friendly method treatment process of ammonium nitrate condensation wastewater |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10128347A (en) * | 1996-11-05 | 1998-05-19 | Kansai Electric Power Co Inc:The | Method for treating water containing nitrite nitrogen |
| JP2005296743A (en) * | 2004-04-08 | 2005-10-27 | Hideo Hayakawa | Method for removing nitrate nitrogen |
| CN103964550A (en) * | 2014-05-24 | 2014-08-06 | 长安大学 | Method for removing nitrate nitrogen in water body |
| CN104891722A (en) * | 2015-06-19 | 2015-09-09 | 四川师范大学 | Method of removing nitrate nitrogen in wastewater |
-
2016
- 2016-01-08 CN CN201610010067.2A patent/CN105417800B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10128347A (en) * | 1996-11-05 | 1998-05-19 | Kansai Electric Power Co Inc:The | Method for treating water containing nitrite nitrogen |
| JP2005296743A (en) * | 2004-04-08 | 2005-10-27 | Hideo Hayakawa | Method for removing nitrate nitrogen |
| CN103964550A (en) * | 2014-05-24 | 2014-08-06 | 长安大学 | Method for removing nitrate nitrogen in water body |
| CN104891722A (en) * | 2015-06-19 | 2015-09-09 | 四川师范大学 | Method of removing nitrate nitrogen in wastewater |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111196664A (en) * | 2020-01-16 | 2020-05-26 | 广东晟鑫环保科技有限公司 | Wastewater desalting treatment method based on advanced treatment |
| 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 |
| CN111484117A (en) * | 2020-04-17 | 2020-08-04 | 无锡中天固废处置有限公司 | Method and device for reducing nitrate radical in acid solution |
| 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 |
| CN114085008A (en) * | 2021-12-07 | 2022-02-25 | 中原环保股份有限公司 | Environment-friendly method treatment process of ammonium nitrate condensation wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105417800B (en) | 2017-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104386874B (en) | A kind of wiring board industry high-concentration waste liquor treating process | |
| CN106396056B (en) | Handle method magnesium eletrolysis containing manganese manganese waste water and recycle Manganese in Waste Water | |
| CN102531296A (en) | Comprehensive electroplating wastewater treatment method | |
| CN103553249B (en) | In electroplating effluent, acid is separated and heavy metal collection method | |
| CN110304757A (en) | It is a kind of for handling the technique of arsenic-containing waste water | |
| CN102642953B (en) | Treatment method for high-salinity heavy-metal-containing production sewage | |
| CN105884157A (en) | Method for removing and recovering heavy metal in sludge through electrolytic method | |
| CN103496802A (en) | Chromium and manganese recovery method in electrolytic manganese chromium wastewater treatment process | |
| CN105417800A (en) | Environment-friendly method for removing nitrate nitrogen in waste water | |
| CN112811663A (en) | High-concentration chromium-containing wastewater treatment method for reducing sludge production | |
| CN105417647B (en) | A kind of method that nitrate nitrogen in water removal is removed using bimetallic as reducing agent | |
| CN106044999B (en) | A kind of method of Fenton group technology processing waste water | |
| CN105540954B (en) | A kind of method that chemical denitrification removes nitrate nitrogen in water removal | |
| CN109437447A (en) | A kind of preprocess method of guanine waste water | |
| CN101428887B (en) | Treatment for nickel-ammonia wastewater with aeration-hydrolyzing process | |
| CN110615501B (en) | Method for treating landfill leachate | |
| De Lima et al. | Anaerobic sulphate-reducing microbial process using UASB reactor for heavy metals decontamination | |
| CN103641227A (en) | Method for eliminating heavy metal in industrial sewage | |
| CN111320316A (en) | Landfill leachate membrane concentrated solution treatment method | |
| CN105884132A (en) | Deep treatment method for thallium-containing wastewater of electronic product manufacturing and metallurgical process | |
| CN114956430A (en) | Landfill leachate membrane concentrated solution treatment process | |
| CN111333152A (en) | Method for treating high-concentration nickel-phosphorus-containing organic waste liquid through electrolytic oxidation | |
| CN106587539B (en) | Treatment method of tannery wastewater | |
| CN109607945B (en) | Method for improving biochemical efficiency of wastewater in photovoltaic and electronic industries | |
| RU2122979C1 (en) | Method of purification of water from nitrates and nitrites |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
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 |
|
| TR01 | Transfer of patent right |