CN213623471U - Device for highly enriching and recovering N2O in denitrification process - Google Patents
Device for highly enriching and recovering N2O in denitrification process Download PDFInfo
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- CN213623471U CN213623471U CN202022359502.7U CN202022359502U CN213623471U CN 213623471 U CN213623471 U CN 213623471U CN 202022359502 U CN202022359502 U CN 202022359502U CN 213623471 U CN213623471 U CN 213623471U
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Abstract
The utility model discloses a denitrification process N2The device for enriching and recovering the O height comprises a biomembrane reactor, a membrane separation component, a modified hollow fiber membrane, a vacuum pump and N2O a collection device; the biomembrane reactor is internally provided with a membrane separation component, the membrane separation component is provided with a modified hollow fiber membrane, and the outer surface of the modified hollow fiber membrane is attached with a biomembrane; the biomembrane reactor is communicated with a water inlet pipe and a water outlet pipe, and the modified hollow fiber membrane is communicated with N2O collecting deviceAnd (4) placing. Utilize the utility model discloses carry out denitrification process N2The O is highly enriched and recovered, thereby simplifying the process flow, reducing the operation cost and greatly improving the N2The enrichment and recovery efficiency of O lays a foundation for the energy utilization of the nitrogen in sewage treatment.
Description
Technical Field
The utility model belongs to the technical field of environment and resource recovery, mainly relate to a denitrification process N2And (4) a device for highly enriching and recovering the O.
Background
Biological denitrification is one of the important directions for sewage treatment. The traditional biological denitrification method is to convert ammonia nitrogen into N by utilizing the principle of nitrification-denitrification2And released to the atmosphere, but this process also releases a strong greenhouse gas N2And O. In recent years, it has been found that N2O is also a potential renewable energy source, for example, when it is used as a combustion improver instead of oxygen, the combustion heat value of methane can be increased by 37%. Thus, N in the course of denitrification2The high enrichment and collection of O become the key of the nitrogen energy utilization in the sewage treatment.
Thus, a method for carrying out the denitrification process N is provided2A device for enriching and recovering O to facilitate the intervention of the metabolic process of denitrification, biological denitrification and N generation2And (4) an O enrichment process.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a realize denitrification process N2A biomembrane reactor using modified hollow fibre membrane as carrier is composed of the high-enriched and recovered biomembrane unit containing N on its surface2Inhibitors of O-reductase and, therefore, may interfere with the metabolic processes of denitrification, effecting N2And (4) enriching O (the enrichment rate is more than 90%). Simultaneously, the gas-liquid separation membrane is used for separating N generated in the denitrification process2Real-time separation of O from the reactor to achieve N2And (4) efficiently recovering the O.
The utility model discloses a realize through following technical scheme.
The embodiment of the utility model provides a denitrification process N2The device for enriching and recovering the O height comprises a biomembrane reactor, a membrane separation component, a modified hollow fiber membrane, a vacuum pump and N2O a collection device; in the biofilm reactorThe device is provided with a membrane separation component, wherein a modified hollow fiber membrane is arranged on the membrane separation component, and a biological membrane is attached to and grown on the outer surface of the modified hollow fiber membrane; the biomembrane reactor is communicated with a water inlet pipe and a water outlet pipe, and the modified hollow fiber membrane is communicated with N2And (4) a collecting device.
Preferably, the ratio of the effective surface area of the membrane separation component to the effective pool volume of the biofilm reactor is 100-300 m2/m3。
Preferably, the modified hollow fiber membrane is made of polystyrene, and the average pore diameter of the membrane is 0.1-0.2 μm.
Preferably, a biological membrane is attached to and grows on the surface of the modified hollow fiber membrane.
Preferably, the modified hollow fiber membrane is connected with N2And a gas flowmeter, a barometer and a vacuum pump are arranged on the pipeline of the O collecting device.
Preferably, the inlet water in the biofilm reactor is wastewater.
Compared with the prior art, the utility model discloses beneficial effect lies in:
(1) real-time separation of N using modified hollow fiber microporous membrane module device2O, can convert N2The conversion rate of O is improved to more than 90 percent;
(2) with endogenous denitrification to effect N2Compared with the enrichment of O, the technology does not need to arrange an anaerobic reactor for pretreatment, simplifies the process flow and reduces the construction and operation cost;
(3) with low pH values to achieve N2Compared with the enrichment of O, the technology reduces the dosage and the operation cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute a limitation of the invention, and in which:
FIG. 1 is an implementation N2O is a device diagram for high enrichment and recovery;
FIGS. 2(a) and 2(b) are schematic cross-sectional views of a modified hollow fiber membrane;
FIG. 3 is a diagram of the denitrification process N2And (4) a transformation effect graph of O.
Wherein, 1, the membrane separation component; 2. modifying the hollow fiber membrane; 3. a biofilm; 4. a gas flow meter; 5. a barometer; 6. a vacuum pump; 7.N2O a collection device; 8. and (4) a valve.
601. Modifying membrane pores on the surface of the hollow fiber membrane; 602. modified material of hollow fiber membrane.
Detailed Description
The present invention will be described in detail with reference to the drawings, wherein the exemplary embodiments and descriptions are provided to explain the present invention, but not to limit the present invention.
As shown in figure 1, the utility model realizes the denitrification process N2The device for enriching and recovering the O height comprises a biomembrane reactor, a membrane separation component 1, a modified hollow fiber membrane 2, a biomembrane 3, a gas flowmeter 4, a barometer 5, a vacuum pump 6 and N2An O trap 7 and a valve 8. A membrane separation component 1 is arranged in the biomembrane reactor, a modified hollow fiber membrane 2 is arranged on the membrane separation component 1, a biomembrane 3 is loaded on the surface of the modified hollow fiber membrane 2, the biomembrane reactor is communicated with a water inlet pipe and a water outlet pipe, and the modified hollow fiber membrane 2 on the membrane separation component is communicated with N2And the O collecting device 7 is characterized in that the modified hollow fiber membrane is made of polystyrene, and nano cuprous oxide is loaded on the surface of the hollow fiber microporous membrane by a traditional immersion precipitation phase conversion method so as to inhibit the activity of nitrous oxide reductase. The average pore diameter of the membrane is 0.1 to 0.2 μm. Modified hollow fiber membrane 2 connected N2And a gas flowmeter 4, a barometer 5, a vacuum pump 6 and a valve 8 are arranged on the pipeline of the O collecting device 7.
In the operation process of the reactor, main substrates of inlet water are sodium nitrite and sodium acetate, the pH value of the inlet water of the biomembrane reactor is controlled to be 6.5, and the ratio of the effective surface area of the membrane separation component to the effective pool volume of the biomembrane reactor is set to be 100-300 m2/m3And carrying out denitrification process.
The activity of nitric oxide reductase is inhibited by the modified hollow fiber membrane loaded nano cuprous oxide, and the generated N is separated from the inner cavity of the separation membrane component by a vacuum pump2O is separated and collected in real time, the range of negative pressure is 0.04-0.08MPa, and the denitrification process N is finally realized2And (4) highly enriching and recovering the O. Fig. 2(a) and 2(b) are schematic sectional views of a modified hollow fiber membrane, in which a modifying material 602 of the hollow fiber membrane is supported on the surface of the modified hollow fiber membrane between pores 601 on the surface of the modified hollow fiber membrane.
The effect of the present invention will be further described below by taking the conventional whole denitrification as an example.
The inlet water substrate contains nitrate and organic matter, and the pH value of the inlet water is controlled to be 6.5. In fig. 1, the separation membrane used in the membrane separation module is a modified hollow fiber membrane 2, the main material is polystyrene, the average pore diameter of the membrane is 0.15 μm, nano cuprous oxide is loaded on the surface of the membrane, and the loading method is the traditional immersion precipitation phase inversion method.
And (3) placing the membrane separation component in a denitrification system, enabling microorganisms to attach and grow on the outer surface of the modified hollow fiber membrane to form a biological membrane, and operating the denitrification biological membrane reactor. The activity of the oxidoreductase is inhibited by utilizing the nano cuprous oxide loaded on the surface of the modified hollow fiber membrane, and the denitrification product is controlled to be N2O。
The inner cavity of the modified hollow fiber membrane is connected with a rotameter, a barometer and a vacuum pump, after the denitrification biofilm is formed, the gas-liquid separation function is started, and N generated in the denitrification process is separated by controlling the negative pressure to be 0.07MPa2O is separated from the reactor in real time in order to create the production of N2Growth conditions of O denitrifying bacteria, and entering N2And an O collecting device 7, the tail end of which is connected with a valve 8.
After biofilm formation, N2The conversion efficiency of O is shown in FIG. 3. Initial stage of opening gas-liquid separation function, N2The O conversion is only 2.6%, with N2Inhibition of O-reductase activity and real-time addition of N2O is separated from the reactor, thereby enhancing the production of N2Growth conditions of O-reducing bacteria, N2The conversion rate of O is gradually improved to 60% at 18 d; at 24d, N2The conversion rate of O is stabilized to 91 percent and then stabilized to about 92 percent, which indicates that the denitrification product is stabilizedIs originally N2O。
On the basis of the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (6)
1. Denitrification process N2The device for enriching and recovering the O height is characterized by comprising a biomembrane reactor, a membrane separation component, a modified hollow fiber membrane, a vacuum pump and N2O a collection device; the biomembrane reactor is internally provided with a membrane separation component, the membrane separation component is provided with a modified hollow fiber membrane, and the outer surface of the modified hollow fiber membrane is attached with a biomembrane; the biomembrane reactor is communicated with a water inlet pipe and a water outlet pipe, and the modified hollow fiber membrane is communicated with N2And (4) a collecting device.
2. The denitrification process N of claim 12The device for enriching and recovering the O height is characterized in that the ratio of the effective surface area of the membrane separation component to the effective pool capacity of the biofilm reactor is 100-300 m2/m3。
3. The denitrification process N of claim 12The device for highly enriching and recovering the O is characterized in that the modified hollow fiber membrane is made of polystyrene, and the average pore diameter of the membrane is 0.1-0.2 mu m.
4. The denitrification process N of claim 12The device for highly enriching and recovering the O is characterized in that a biological membrane is attached to and grown on the surface of the modified hollow fiber membrane.
5. The denitrification process N of claim 12The device for enriching and recovering the O height is characterized in that the modified hollow fiber membrane is communicated with N2The pipeline of the O collecting device is provided with a gas flowmeter and a barometerAnd a vacuum pump.
6. The denitrification process N of claim 12The device for highly enriching and recovering the O is characterized in that the inlet water in the biomembrane reactor is wastewater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022359502.7U CN213623471U (en) | 2020-10-21 | 2020-10-21 | Device for highly enriching and recovering N2O in denitrification process |
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| CN202022359502.7U CN213623471U (en) | 2020-10-21 | 2020-10-21 | Device for highly enriching and recovering N2O in denitrification process |
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