CN105967326A - Device and method for removing N2O through denitrification - Google Patents
Device and method for removing N2O through denitrification Download PDFInfo
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- CN105967326A CN105967326A CN201610366366.XA CN201610366366A CN105967326A CN 105967326 A CN105967326 A CN 105967326A CN 201610366366 A CN201610366366 A CN 201610366366A CN 105967326 A CN105967326 A CN 105967326A
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- denitrification
- municipal sewage
- sbr
- denitrification sbr
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/282—Anaerobic digestion processes using anaerobic sequencing batch reactors
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/34—N2O
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- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a device and method for removing N2O through denitrification, and belongs to the field of sewage treatment and environmental protection. The device comprises a municipal sewage original water tank, a denitrification SBR, a magnetic stirrer, a N2O microelectrode, a N2O online monitoring system and a municipal sewage outlet tank. The method comprises the steps that municipal sewage enters the denitrification SBR, a N2O solution is added into the denitrification SBR, and N2O serves as a denitrifying electron acceptor to conduct hypoxic stirring for 2 h to 4 h; precipitation is conducted for 30 min to 45 min, water is drained, and drained water enters the municipal sewage outlet tank; the denitrification SBR needs on-time mud discharge to keep the sludge concentration of a reactor ranging from 2,500 mg/L to 4,000 mg/L, wherein SRT is 16 d; removal of COD in the sewage and additional N2O is achieved. According to the device and method for removing N2O through denitrification, an economical, simple and efficient N2O removing mode is opened up, COD in the sewage is removed, N2O replaces a traditional denitrifying electron acceptor, the electron acceptor is obtained without aeration, and energy consumption is saved.
Description
Technical field
The present invention relates to denitrification and remove N2The apparatus and method of O, belong to sewage disposal and environmental conservation
Technical field.
Background technology
Nitrous oxide (N2O) it is that Kyoto Protocol regulation includes carbon dioxide (CO2), methane
(CH4), hydrofluorocarbons (HFCs), perfluorinated hydrocarbon (PFCs) and sulfur hexafluoride (SF6)
At one of interior six kinds of greenhouse gases (greenhouse gases, GHGs).N2O weighs in an atmosphere
Exist, but its to heat potentiality be CO2298 times.The N relevant to mankind's activity2O source of release character
Chemistry and biological two big processes can be divided into.N in chemical process2O source of release by oxidizing fire, burn
The compositions such as change, commercial production and atmospheric sedimentation.The N of release in bioprocess2O mostlys come from agro-farming
Soil, Marine microorganism, compost storage pool and nitrogenous garbage and the processing procedure of waste water.Wherein
Nitrogenous effluent includes municipal sewage, percolate and industrial wastewater etc..At present, N2O is big to the whole world
The contribution of gas greenhouse effect has reached 5～6%.Therefore, gradually strengthen in Global Greenhouse Effect
Today, the most effectively control and remove N2O has become a difficult problem for research.
In the current research removed about N2O, mainly there is N2The direct catalytic decomposing method of O.
Refer at high temperature, use NiO, Fe2O3、Al2O3、CuO、MoO3Etc. one therein or many
Plant metal oxide catalyst, or N2O can directly be urged by one or more zeolite catalysts carrying ferrum
Change and following reaction: 2N occurs2O→2N2+O2.The method does not introduce impurity, does not produce secondary dirt because of it
Dye is considered as the processing method having much prospect.But it requires high temperature and catalyst, high expensive.
In saprobia denitrification process, with nitrate (NO3 -) it is that electron acceptor carries out denitrification
During, nitrate (NO3 -) first it is reduced to nitrite (NO2 -), then nitrite
(NO2 -) it being reduced to nitric oxide (NO), nitric oxide (NO) is reduced further afterwards
For nitrous oxide (N2O), last nitrous oxide (N2O) nitrogen (N it is reduced to2).At this
It is found that N in reduction process2O, simultaneously can also be as anti-nitre as denitrifying intermediate product
The electron acceptor changed, by N2O is reduced to N2Antibacterial be Nos, this is just for N2The removal of O provides
New thinking.
Denitrification removes N2While O, also been removed the COD in sewage simultaneously, be one action two
?.The method is simple to operate, low cost, does not has secondary pollution, is that one is opened one's minds.Black smelly water
Body is also current one big problem, and the reason of black and odorous water is that water body is contaminated to be given out containing high COD
Stink.If by apparatus and method of the present invention, with N2O as denitrifying electron acceptor, thus
COD in degraded black and odorous water, therefore the present invention also provides a kind of roadmap for black and odorous water.
Current research does not also have and is used for denitrification process except N2O, therefore application prospect is the most wide.
Summary of the invention
The purpose of the present invention is aiming at greenhouse gases N2The removal of O, proposes denitrification and removes N2O's
Apparatus and method.Water is processed and is combined with Air Pollution Control, it is achieved N2The removal of O, alleviates the whole world
Greenhouse effect, the most also removes the COD in sewage.Both tradition N had been saved2The catalysis of O removal process
Agent and heating expense, saving again conventional denitrification is to obtain the aeration expense that electron acceptor needs.
Process operation flow process is simple, and does not produce secondary pollution, is a kind of economic and environment-friendly type mode.
It is an object of the invention to solve by the following technical programs: denitrification removes N2The device of O,
It is characterized in that, including municipal sewage raw water box (1), denitrification SBR (2), magnetic stirring apparatus
(3)、N2O microelectrode (4), N2O on-line monitoring system (5), municipal sewage water tank (6)；
Municipal sewage raw water box (1) is connected with denitrification SBR (2) by intake pump (1.1)；Anti-nitre
Change SBR (2) and pass through N2O microelectrode (4) and N2O on-line monitoring system (5) connects；Anti-nitre
Change SBR (2) to be connected with municipal sewage water tank (6) by drain valve (2.4).
Described denitrification SBR (2) is provided with water intaking valve (2.1), airbag (2.2), sampling injector
(2.3), drain valve (2.4), mud valve (2.5).
Denitrification removes N2The method of O, it is characterised in that comprise the following steps:
1) system start-up:
By in traditional wastewater factory A2O process reflows sludge seeding to denitrification sbr reactor device, make anti-
In answering device, sludge concentration reaches 2500～4000mg/L；
2) regulation operation when running:
Municipal sewage enters into municipal sewage raw water box (1), is passed through N in municipal sewage2O gas,
Sewage is made to become N2O solution, enters denitrification SBR (2) by intake pump (1.1) afterwards, logical
Cross N2O microelectrode (4) and N2O on-line monitoring system (5) monitoring denitrification SBR (2) mixing
N in liquid2O concentration, with N2O carries out anoxia stirring 2～3h to N as denitrifying electron acceptor2O
Being removed completely, in whipping process, magnetic stirring apparatus rotating speed is 150-200r/min, only need to be by anti-
Answer solution mix homogeneously in device, should not stir too fast, prevent N2O overflows；Precipitation 30～45min,
Draining ratio is 40～50%, is drained into municipal sewage water tank (6).Denitrification SBR (2)
It is connected with airbag (2.2) at top and is easy to balancing response device external and internal pressure.Denitrification SBR needs to arrange on time
Mud, makes reactor sludge concentration maintain 2500～4000mg/L, and SRT is 16d.
Denitrification of the present invention removes N2The apparatus and method of O, have the advantage that
1) traditional method removed by high-temperature catalytic compared to N2O, denitrification removes N2The dress of O
Put and without heating and add catalyst with method, provide cost savings.
2) process operation is simple and easy to control, does not produce secondary pollution, belongs to environment amity technique.
3) traditional denitrification needs to obtain electron acceptor by aeration, and denitrification removes N2The dress of O
Put with method with N2O, as denitrifying electron acceptor, saves 100% aeration energy consumption, reduces
Sewage removes COD processing cost.
4) a kind of roadmap is provided for the black and odorous water containing high COD.
Accompanying drawing explanation
Fig. 1 is that denitrification of the present invention removes N2The apparatus structure schematic diagram of O.
Figure 1 is municipal sewage raw water box, 2 is denitrification SBR, 3 is magnetic stirring apparatus, 4 is
N2O microelectrode, 5 it is N2O on-line monitoring system, 6 it is municipal sewage water tank；1.1 is intake pump；
2.1 be water intaking valve, 2.2 be airbag, 2.3 be sampling injector, 2.4 be drain valve, 2.5 for mud valve.
Detailed description of the invention
The present invention will be further described with embodiment below in conjunction with the accompanying drawings: denitrification goes as shown in Figure 1
Except N2The device of O, comprises municipal sewage raw water box (1), denitrification SBR (2), magnetic agitation
Device (3), N2O microelectrode (4), N2O on-line monitoring system (5), municipal sewage water tank (6)；
Municipal sewage raw water box (1) is connected with denitrification SBR (2) by intake pump (1.1)；Anti-nitre
Change SBR (2) and pass through N2O microelectrode (4) and N2O on-line monitoring system (5) connects；Anti-nitre
Change SBR (2) to be connected with municipal sewage water tank (6) by drain valve (2.4).
Described denitrification SBR (2) is provided with water intaking valve (2.1), airbag (2.2), sampling injector
(2.3), drain valve (2.4), mud valve (2.5).
Experiment uses Beijing university dependents' district sanitary sewage, N2O solution is from N2O gas tank blasts water
Saturated N2O solution, concentration is 800～1000mgN2O-N/L, adds 100～200mL saturated N2O
Solution makes mixed liquor N2O (in terms of N) concentration is 60～80mg/L, the concrete water quality of the former water of sanitary sewage
As follows: COD concentration is 120～260mg/L, NO2 --N concentration < 0.1mg/L, NO3 --N concentration
< 0.8mg/L, P concentration is 5～7mg/L, and pH is 7～8.Pilot system is as it is shown in figure 1, react
Device uses lucite to make, and denitrification SBR dischargeable capacity is 2L, and draining ratio is 40～50%.
It is embodied as comprising the following steps:
1) system start-up:
By traditional wastewater factory A2O process reflows sludge seeding, in denitrification sbr reactor device, makes reaction
In device, sludge concentration reaches 3500mg/L；
2) regulation operation when running:
Municipal sewage enters into municipal sewage raw water box (1), is passed through N in municipal sewage2O gas,
Sewage is made to become N2O solution, enters denitrification SBR (2) by intake pump (1.1) afterwards, logical
Cross N2O microelectrode (4) and N2O on-line monitoring system (5) monitoring denitrification SBR (2) mixing
N in liquid2O concentration, with N2O carries out anoxia stirring 2～3h to N as denitrifying electron acceptor2O
Being removed completely, in whipping process, magnetic stirring apparatus rotating speed is 150-200r/min, only need to be by anti-
Answer solution mix homogeneously in device, should not stir too fast, prevent N2O overflows；Precipitation 30～45min,
Draining ratio is 40～50%, is drained into municipal sewage water tank (6).Denitrification dephosphorization SBR (2)
The airbag (2.3) being connected with 1L at top is easy to balancing response device external and internal pressure.Denitrification dephosphorization SBR
Needing spoil disposal on time, make reactor sludge concentration maintain 2500～4000mg/L, SRT is 16d.
Result of the test shows: after stable, denitrification sbr reactor device water outlet N2O concentration is
0～2mg/L, COD concentration is 35～40mg/L, NO2 --N < 0.1mg/L, NO3 --N < 0.5mg/L,
P<0.5mg/L。
It is above the specific embodiment of the present invention, it is simple to these those skilled in the art can preferably manage
Solve and the application present invention, but the enforcement of the present invention is not limited to this, therefore these those skilled in the art
The simple modifications being the present invention is all within scope.
Claims (2)
1. denitrification removes N2The device of O, its feature includes: municipal sewage raw water box (1), anti-nitre
Change SBR (2), magnetic stirring apparatus (3), N2O microelectrode (4), N2O on-line monitoring system (5),
Municipal sewage water tank (6)；Municipal sewage raw water box (1) passes through intake pump (1.1) and denitrification
SBR (2) is connected, and denitrification SBR (2) passes through N2O microelectrode (4) and N2O supervises online
Examining system (5) connects, and denitrification SBR (2) is by drain valve (2.4) and municipal sewage water tank
(6) connect；
Described denitrification SBR (2) be provided with water intaking valve (2.1), airbag (2.2), sampling injector (2.3),
Drain valve (2.4), mud valve (2.5).
2. the method applying device as claimed in claim 1, it is characterised in that comprise the following steps:
1) system start-up:
By traditional wastewater factory A2O process reflows sludge seeding, in denitrification sbr reactor device, makes anti-
In answering device, sludge concentration reaches 2500～4000mg/L；
2) regulation operation when running:
Municipal sewage enters into municipal sewage raw water box (1), is passed through N in municipal sewage2O gas,
Sewage is made to become N2O solution, enters denitrification SBR (2) by intake pump (1.1) afterwards, logical
Cross N2O microelectrode (4) and N2O on-line monitoring system (5) monitoring denitrification SBR (2) mixing
N in liquid2O concentration, with N2O carries out anoxia stirring 2～3h to N as denitrifying electron acceptor2O
Being removed completely, in whipping process, magnetic stirring apparatus rotating speed is 150-200r/min；Precipitation
30～45min, draining ratio is 40～50%, is drained into municipal sewage water tank (6)；Denitrification
SBR is closed system, is connected with airbag at its top and is easy to balancing response device external and internal pressure；Denitrification SBR
Needing spoil disposal on time, make reactor sludge concentration maintain 2500～4000mg/L, SRT is 16d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610366366.XA CN105967326B (en) | 2016-05-28 | 2016-05-28 | Denitrification removes N2The device and method of O |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610366366.XA CN105967326B (en) | 2016-05-28 | 2016-05-28 | Denitrification removes N2The device and method of O |
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| CN105967326B CN105967326B (en) | 2018-10-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112321112A (en) * | 2020-10-21 | 2021-02-05 | 西安建筑科技大学 | Device and method for nitrogen energy regeneration of sewage treatment plant |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5013441A (en) * | 1988-07-20 | 1991-05-07 | Goronszy Mervyn C | Biological nutrient removal with sludge bulking control in a batch activated sludge system |
-
2016
- 2016-05-28 CN CN201610366366.XA patent/CN105967326B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5013441A (en) * | 1988-07-20 | 1991-05-07 | Goronszy Mervyn C | Biological nutrient removal with sludge bulking control in a batch activated sludge system |
Non-Patent Citations (2)
| Title |
|---|
| STEPHEN R. HUTCHINS: "Biodegradation of monoaromatic hydrocarbons by aquifer microorganisms using oxygen, nitrate , or nitrous oxide as the terminal electron acceptor", 《APPLIED AND ENVIRONMENTAL MICROBIOLOGY》 * |
| 王传新 等: "内源反硝化过程中N2O的产生特征", 《北京工业大学学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112321112A (en) * | 2020-10-21 | 2021-02-05 | 西安建筑科技大学 | Device and method for nitrogen energy regeneration of sewage treatment plant |
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| CN105967326B (en) | 2018-10-09 |
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