CN114751515B - Stable and efficient short-cut denitrification method and treatment device - Google Patents
Stable and efficient short-cut denitrification method and treatment device Download PDFInfo
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Abstract
The invention discloses a stable and efficient short-cut denitrification method and a treatment device, and belongs to the technical field of environment-friendly wastewater treatment. The invention leads the nitrate-containing wastewater into a hydrogen-based anaerobic bioreactor inoculated with nitrate reducing bacteria for continuous flow treatment, and controls the pH of a mud-water mixing system in the reactor to be 10.5-11, so that the nitrate reducing bacteria in the reactor use hydrogen as an electron donor to carry out nitrate ion (NO) in the wastewater 3 ‑ -N) reduction to nitrite ion (NO) 2 ‑ -N) and accumulating. Compared with the traditional short-range denitrification method, the method uses the hydrogen matrix membrane biological membrane bioreactor to convert nitrate nitrogen into nitrite nitrogen at high pH and accumulate the nitrite nitrogen, reduces the consumption of carbon source, theoretically does not need to add organic carbon source, does not need to add medicine for pH regulation and control, and has simple and convenient operation and high removal rate.
Description
Technical Field
The invention belongs to the technical field of environment-friendly wastewater treatment, and particularly relates to a stable and efficient short-cut denitrification method and a treatment device.
Background
With the continuous increase of the demand of carbon emission reduction, the carbon emission reduction in the denitrification process of sewage becomes an interesting problem. Anammox (with ammonia Nitrogen (NH) + 4 -N) and nitrous Nitrogen (NO) 2 - -N) production of nitrogen by microbial reactionQi (N) 2 ) The nitrogen removal method has remarkable prospect as a nitrogen removal method without a carbon source, but most of nitrogen-containing pollutants in nitrogen-containing sewage nowadays mainly comprise ammonia nitrogen, and an electron acceptor for anaerobic ammonia oxidation is insufficient.
Currently, microbial processes supply nitrous Nitrogen (NO) 2 - ) The method mainly comprises short-cut nitrification (ammonia Nitrogen (NH) + 4 -N) conversion to nitrite Nitrogen (NO) by microbial reaction 2 - -N)) and short-cut denitrification (reduction of nitrate Nitrogen (NO)) 3 - -N) conversion to nitrite Nitrogen (NO) by microbial reaction 2 - N)), wherein the short-cut nitrification process is difficult to generate stable nitrite nitrogen, ammonia nitrogen in the short-cut nitrification process is always oxidized into nitrate nitrogen, and therefore the short-cut denitrification process is a nitrite nitrogen supply path which is easy to realize at present.
The existing research shows that the short-range denitrification is easy to realize under higher pH, but the cost of the chemical feeding process is higher, and the operation difficulty is increased; in the denitrification process, a carbon source needs to be additionally added for the microorganisms to utilize to generate carbon dioxide, so that only carbon emission reduction in relative significance can be realized, and part of cost is also increased.
CN113548731A discloses a domestication culture method of sulfur autotrophic short-cut denitrification sludge, which adds N-lauroyl-L-homoserine lactone to wastewater containing ammonia nitrogen, nitrate nitrogen, sulfide and carbonate so as to play a role in accumulating the short-cut denitrification sludge. The method can obtain the short-range denitrification sludge with high accumulation rate, but the added substances in the sewage quality are more, the removal efficiency of the nitrate is lower, and the method is difficult to put into practical application.
CN113511731A discloses a method for increasing the accumulation of nitrite in the course of short-range denitrification, which attempts to achieve the object by increasing the amount of short-range denitrification dominant bacteria in the population. The method can obtain good short-range denitrification effect, but has complex operation, large and complex dosage of added medicament, and is not beneficial to large-scale popularization and application.
Disclosure of Invention
The invention aims to overcome the defects of low efficiency, large dosage of medicament, complex process route and the like of short-cut denitrification accumulation of nitrite in the prior art, and provides a stable and efficient short-cut denitrification method and a treatment device.
The inventive concept of the present invention is to use a hydrogen matrix membrane biofilm bioreactor inoculated with nitrate reducing bacteria to convert nitrate Nitrogen (NO) at high pH and under anaerobic conditions 3 - -N) to nitrite Nitrogen (NO) 2 - -N). Compared with the traditional short-range denitrification method, the method theoretically does not need to add a carbon source, does not need to add medicine for pH regulation and control, and is simple and convenient to operate and high in removal rate.
In order to achieve the above purpose, the invention specifically adopts the following technical scheme:
in a first aspect, the present invention provides a stable and efficient short-cut denitrification method, which comprises: and (2) introducing the nitrate-containing wastewater into a hydrogen-based anaerobic bioreactor inoculated with nitrate reducing bacteria for continuous flow treatment, and controlling the pH of a mud-water mixing system in the reactor to be 10.5-11 so that the nitrate reducing bacteria in the reactor reduce nitrate ions in the wastewater into nitrite ions by taking hydrogen as an electron donor and accumulate the nitrite ions.
Preferably, the concentration of nitrogen corresponding to nitrate in the nitrate-containing wastewater is 50 +/-5 mg/L.
Preferably, the hydrogen-based anaerobic bioreactor is a hydrogen-based membrane bioreactor (MBfR), a hollow fiber membrane connected with a pressurized hydrogen source is arranged in the reactor, and hydrogen permeates from inside to outside through the hollow fiber membrane for the use of microorganisms.
Furthermore, in the hydrogen-based membrane bio-membrane reactor, the partial pressure of hydrogen in the membrane is controlled to be 1.25 +/-0.25 MPa, and the temperature is controlled to be 27-31 ℃.
In the first aspect, the hydrogen-based anaerobic bioreactor is preferably provided with a carbon dioxide aeration device for reducing the pH by blowing carbon dioxide when the pH of the sludge-water mixed system in the reactor is greater than 11.
As a preference of the first aspect, the hydraulic retention time during the continuous flow operation of the hydrogen-based anaerobic bioreactor is preferably controlled to be 10-20 h.
As a preference of the first aspect, the pH of the muddy water mixed system in the hydrogen-based anaerobic bioreactor is preferably controlled to 10.6 ± 0.1.
In a second aspect, the invention provides a stable and efficient short-cut denitrification treatment device, which comprises an anaerobic membrane bioreactor and a pH adjusting device; the anaerobic membrane bioreactor is provided with a water inlet and a water outlet, and hollow fiber membranes are distributed in bundles in the inner cavity of the anaerobic membrane bioreactor; the membrane cavity of the hollow fiber membrane is communicated with a pressurized hydrogen source, so that hydrogen permeates from inside to outside through the hollow fiber membrane body and is used by microorganisms; the pH adjusting device comprises a pH detecting device and a carbon dioxide aeration device, wherein the pH detecting device is used for monitoring the pH of the sludge-water mixture system in the reactor, and controlling the carbon dioxide aeration device to blow carbon dioxide into the sludge-water mixture system when the pH rises to exceed 11 so as to reduce the pH to be within a set control range of 10.5-11.
Preferably, in the second aspect, the pressurized hydrogen source is a hydrogen cylinder or a hydrogen generator.
Preferably, the reactor is of a water inlet and outlet type in which water is fed from the bottom and overflows from the top.
Compared with the prior art, the method has the following beneficial effects:
(1) The invention utilizes the denitrification of the hydrogen substrate to realize the conversion rate of converting the nitrate into the nitrite over 90 percent.
(2) The invention utilizes the characteristic of denitrification self-alkalization to obtain a higher pH accumulation value, can naturally obtain the pH of 10.6 under the uncontrolled condition, and reduces the dosage for improving the pH.
Drawings
FIG. 1 is a process flow diagram of the present invention;
wherein: 1-water inlet equipment, 2-membrane component, 3-hydrogen membrane biomembrane reactor, 4-pressurized hydrogen source, 5-collecting device, 6-pH controller, 7-CO 2 Air supply equipment, 8-water bath device.
FIG. 2 is a graph showing the operational effect of the method for stably converting nitrate into nitrite in the present invention on the accumulation of nitrite.
FIG. 3 shows the operation effect of the hydrogen-based membrane bio-membrane reactor 3 in example 2 of the present invention at different hydraulic retention times.
FIG. 4 is a graph showing the operation effect of the hydrogen-based membrane bio-membrane reactor 3 in comparative example 1 in different pH environments.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The technical characteristics in the embodiments of the present invention can be combined correspondingly without mutual conflict.
In the description of the present invention, it should be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element, i.e., intervening elements may be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.
In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In a preferred embodiment of the present invention, a stable and efficient short-cut denitrification method and a corresponding processing device for implementing the method are provided. Each of which is described in detail below.
The invention provides a stable and efficient short-range denitrification method, which comprises the following specific steps: and (2) introducing the nitrate-containing wastewater into a hydrogen-based anaerobic bioreactor inoculated with nitrate reducing bacteria for continuous flow treatment, and controlling the pH of a mud-water mixing system in the reactor to be 10.5-11 so that the nitrate reducing bacteria in the reactor reduce nitrate ions in the wastewater into nitrite ions by taking hydrogen as an electron donor and accumulate the nitrite ions. The invention utilizes hydrogen substrate denitrification to realize the conversion rate of nitrate into nitrite of more than 90 percent, and nitrite can be accumulated without further reduction into other nitrogen compound types (such as nitrogen).
Short-cut denitrification needs to be realized at a higher pH value, so that the pH value of a sludge-water mixing system in a reactor is maintained in an alkaline state by continuously adding an alkaline medicament in the traditional short-cut denitrification reaction. In the method provided by the invention, no external medicament is added to increase the alkalinity theoretically, and the alkaline environment capable of obtaining a higher nitrite ion accumulation rate can be maintained in the reactor through denitrification and self-alkalization. Experiments show that the pH value of the hydrogen-based membrane bio-membrane reactor 3 capable of obtaining the optimal nitrite accumulation rate is preferably 10.5-11.
As shown in FIG. 1, the stable and efficient short-cut denitrification treatment device provided by the invention mainly comprises an anaerobic membrane bioreactor, a pH adjusting device and a collecting device 5. Wherein, the anaerobic membrane bioreactor is the core of the whole treatment device, and the anaerobic membrane bioreactor in the embodiment is realized by adopting a hydrogen-based membrane bioreactor (MBfR). And a water inlet and a water outlet are arranged on the reactor shell of the MBfR, wherein the water inlet is connected with an external water inlet device 1 for storing the nitrate-containing wastewater to be treated, and the water outlet is connected with a collecting device 5 for collecting the treated wastewater. In order to control the temperature of the reactor conveniently, a water bath cavity is arranged outside the shell of the reactor, and a water inlet and a water outlet of the water bath cavity are respectively connected with an external water bath device 8.
MBfR is a hydrogen-based membrane bio-membrane reactor, which uses hydrogen as an electron donor, so that membrane components 2 consisting of hollow fiber membranes are distributed in a bundle in the inner cavity of the reactor, membrane cavities at two ends of the hollow fiber membranes are respectively communicated with a pressurized hydrogen source 4, and pressurized hydrogen is blown into the membranes from the pressurized hydrogen source, so that the hydrogen permeates through the hollow fiber membranes from inside to outside to be used by microorganisms. The hydrogen required for the reaction in this embodiment may be supplied from a hydrogen generator as a source of pressurized hydrogen, although other embodiments may be supplied from a hydrogen cylinder or other high pressure hydrogen storage device.
In addition, short-range denitrification needs to be realized at a higher pH value, so that the pH value of a sludge-water mixing system in the reactor is maintained in an alkaline state by continuously adding an alkaline medicament in the traditional short-range denitrification reaction. However, in the present invention, nitrate-reducing bacteria in MBfR anaerobically convert nitrate Nitrogen (NO) 3 - -N) to nitrite Nitrogen (NO) 2 - And in the process of-N), the characteristic of denitrification self-alkalization exists, and the system can be maintained in an alkaline state without adding a medicament. Practical tests have shown that a pH of 10.6 is generally obtained naturally without external control. Therefore, the invention theoretically does not need to add any external medicament to improve the alkalinity, and greatly saves the operating cost of the reactor.
Although the reactor can naturally obtain the pH of 10.6 through denitrification and self-alkalization, the pH of a sludge-water mixing system in the reactor can be overhigh due to external interference such as change of inlet water quality, change of environmental factors and the like in the actual operation process, and the normal metabolism of nitrate reducing bacteria is influenced. Therefore, in the present invention, it is necessary to adjust an excessively high pH in the system by a pH adjusting device. In order to avoid introducing medicaments to increase secondary pollution, the pH adjusting device comprises a pH detecting device and a carbon dioxide aeration device, wherein the pH detecting device is used for monitoring the pH of a mud-water mixture system in the reactor and controlling the carbon dioxide aeration device to blow carbon dioxide into the reactor when the pH rises to exceed 11 so as to reduce the pH to be within a set control range of 10.5-11.
The specific form of the pH adjusting device and the pH detecting device may be various, and CO is used as the pH adjusting device in this embodiment 2 Gas supply equipment 7, CO 2 The gas supply device 7 is connected with an aeration head which is positioned below the liquid level in the reactor through a gas supply pipeline. The pH detection device comprises a pH probe, a pH controller 6 and an electromagnetic valve arranged on the gas supply pipeline, the pH probe is arranged below the liquid level in the reactor,the sensed pH value electric signal of the mud-water mixing system is sent to the pH controller 6 through a control line. And the pH controller 6 is connected with CO through a control line 2 The electromagnetic valve on the air supply pipeline of the air supply equipment 7 is connected, so that the pH controller 6 can feed back and control the opening and closing of the electromagnetic valve according to the pH sensed by the pH probe, and further passes through CO 2 The aeration of (2) is performed to adjust the pH in the reactor to maintain it within a predetermined pH control range (10.5 to 11). The pH controller 6 may be any control device capable of implementing a feedback control function, such as a single chip, a PLC, a microcomputer, etc., and performs pH adjustment by PID control, and when pH is too high, the pH controller controls the solenoid valve to open, and CO is controlled to be in a CO state 2 The air supply equipment aerates the system, and when the pH value reaches a set value, the electromagnetic valve is closed, so that the aim of controlling the pH value is fulfilled.
In this embodiment, when the stable and efficient short-range denitrification processing apparatus is used, nitrate reducing bacteria may be pre-inoculated in the hydrogen-based membrane bio-membrane reactor 3, then the nitrate-containing wastewater in the water inlet device 1 is continuously pumped into the hydrogen-based membrane bio-membrane reactor 3, and simultaneously the hydrogen generator provides corresponding high-pressure hydrogen, and the microorganisms are utilized to carry out the continuous flow processing of nitrate ions (NO) in the wastewater 3 - ) Reduction to nitrite ion (NO) 2 - ) And accumulated and finally output as effluent. In order to make the internal environment of the reactor uniform, a circulating pump can be arranged in the reactor to enhance the hydraulic disturbance.
In the invention, the reactor preferably adopts overflow type water outlet from the upper part of the reactor, so that only a single peristaltic pump is needed for water inlet from the bottom, the water inlet is in full contact reaction with microorganisms in the process of upward flow, and the microorganisms carry out full contact reaction on nitrate ions (NO) in the wastewater 3 - ) Reduction to nitrite ion (NO) 2 - ) And accumulated.
The nitrate-reducing bacteria used in the anaerobic treatment according to the present invention are microorganisms that are widely present in nature and have the ability to reduce nitrate, and can reduce nitrate into nitrite, ammonia, nitrogen, or the like by the nitrate reduction (nitrate reduction) action. The nitrate reducing bacteria can be obtained by domestication and enrichment in a laboratory without limiting specific strains or floras, anaerobic biological floras in a nitrate-containing environment can also be adopted, or activated sludge of a sewage treatment plant with denitrification is directly adopted, and the method is not limited.
The above-described stable and efficient short-cut denitrification process can be realized by the stable and efficient short-cut denitrification processing apparatus shown in fig. 1, but may be realized by another processing apparatus.
In the method and the device, the specific process parameters in the operation process can be adjusted and optimized according to actual needs, and the final treatment effect is taken as the reference. In the present invention, nitrate (i.e., nitrate nitrogen NO) in the nitrate-containing wastewater to be treated 3 - The nitrogen concentration corresponding to-N) is preferably 50. + -.5 mg/L. In the hydrogen-based membrane biomembrane reactor, the intra-membrane hydrogen partial pressure of the hollow fiber membrane is controlled to be 0.5-2 MPa, preferably 1.25 +/-0.25 MPa, and further preferably 1.5MPa; the reactor operating temperature can be operated at room temperature, and is preferably controlled at 27-31 ℃, and further preferably at 30 ℃; the pH value of the reactor internal slurry-water mixing system is controlled to be 10.5-11, preferably 10.6 +/-0.1. Preferably, CO is used 2 The aeration system is used as a pH adjusting system. The hydraulic retention time in the continuous flow operation process of the hydrogen-substrate anaerobic bioreactor is preferably controlled to be 10-20 h, and further preferably 15h.
The device for stably converting nitrate into nitrite comprises an anaerobic bioreactor, a pH adjusting device and a final collecting device; in an anaerobic bioreactor, the flora reacts NO in the wastewater under proper conditions 3 - Reduction to NO 2 - And accumulating; the pH adjusting device is used for adjusting the pH in the anaerobic bioreactor; and finally, collecting the wastewater after reaction by using a collecting device.
In order to further demonstrate the specific technical effects of the present invention, the following demonstrates the treatment effects achieved by the above-mentioned stable and efficient short-cut denitrification method based on the above-mentioned stable and efficient short-cut denitrification treatment apparatus shown in fig. 1.
Example 1
In this example, the process flow of the present invention was used to treat simulated wastewater.
Preparing simulated wastewater containing nitrate. The water quality is as follows: measuring nitrate ion (NO) in the wastewater with ion chromatography at pH of 6.8 3 - -N) concentration of 50mg/L.
The simulated wastewater was treated by a stable, high-efficiency and short-range denitrification treatment apparatus shown in FIG. 1, and MBfR was used as a site for nitrate-containing wastewater treatment. Wherein the reactor is pre-inoculated with nitrate reducing bacteria enriched in advance. In this embodiment, the hollow fiber membrane in the MBfR membrane biofilm reactor is a membrane module with an effective length of 1m for the enrichment and growth of denitrifying bacteria. The cover of the reactor adopts a flange structure, and the airtightness of the reactor is ensured by fixing 8M 8 bolt-nut assemblies and rubber pads, so that the inside of the reactor is maintained in an anaerobic environment. The reactor is a double-layer plastic shell with a plurality of interfaces on the side surface, which can effectively avoid corrosion possibly caused by long-term operation, and the two layers of plastic shells are used as water bath cavities and are respectively connected with an external water bath device 8.
In the wastewater treatment process, the whole reactor is operated in a continuous flow mode, water is continuously fed and discharged, the temperature of the reactor is controlled to be 30 ℃, the hydraulic retention time HRT is 15h, the pH value of a mud-water mixing system is controlled to be 10.6 through a pH adjusting device (the pH value is allowed to fluctuate within 10.5-10.7, when the pH value of the mud-water mixing system in the reactor is more than 10.7, carbon dioxide is blown to reduce the pH value to return to 10.6), and the partial pressure of hydrogen in a membrane is controlled to be 1.5MPa. Finally, the nitrate Nitrogen (NO) of the inlet water in the reactor is measured by ion chromatography at the 60 th to 125 th days of steady state operation 3 - -N), nitrate Nitrogen (NO) in effluent 3 - -N), nitrous Nitrogen (NO) in the effluent 2 - -N) concentration.
The results of steady-state operation of the reactor in this example, as shown in FIG. 2, indicate that more than 50% of nitrate ions in wastewater were reduced by microorganisms and the degraded nitrate ions were converted into nitrite ions at an accumulation rate of not less than 90%. The total amount of internal dissolved oxygen is between 0.5 and 4mg/L in the running process of the reactor.
Therefore, the method can complete the stable accumulation of the nitrate nitrogen converted into the nitrite nitrogen in a short hydraulic retention time, and the conversion rate of the nitrate nitrogen converted into the nitrite nitrogen is more than or equal to 90 percent.
Example 2
The apparatus, method and operating conditions of this example were the same as those of example 1 except that the hydraulic retention time of the reactor was controlled differently and four gradients of 5h, 10h, 15h and 20h were set in the HRT. As shown in FIG. 3, the results show that under the condition that the water inlet condition is the same as other operation conditions, the reactor can stably convert nitrate nitrogen into nitrite nitrogen under different hydraulic retention time, and the conversion rate is more than or equal to 90 percent. From the viewpoint of conversion, the HRT is preferably set to 10 to 20 hours, and more preferably 15 to 20 hours.
Comparative example 1
The treatment apparatus, method and operating conditions of this comparative example were the same as those of example 1 except that the internal slurry-water mixing system was controlled to have a different pH during the operation of the reactor. In the comparative example, three gradients of pH =10, 9.5, and 9 were set for the target of pH control in the hydrogen membrane biofilm reactor 3, and the other conditions were the same. As shown in fig. 4, the results show that: nitrite Nitrogen (NO) measured in effluent at pH =10, 9.5, 9 2 - The concentration of-N) is less than or equal to 5mg/L, and no obvious nitrite accumulation phenomenon can be formed. Therefore, the pH of the slurry-water mixed system in the hydrogen membrane biofilm reactor 3 of the present invention is preferably controlled to 10.5 to 11.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.
Claims (6)
1. A stable and efficient short-cut denitrification method is characterized by comprising the following steps: introducing nitrate-containing wastewater into a hydrogen-based anaerobic bioreactor inoculated with nitrate reducing bacteria for continuous flow treatment, and controlling the pH of a mud-water mixing system in the reactor to be 10.5 to 11 so that the nitrate reducing bacteria in the reactor reduce nitrate ions in the wastewater into nitrite ions by taking hydrogen as an electron donor and accumulate the nitrite ions;
the hydrogen substrate anaerobic bioreactor adopts a hydrogen substrate membrane bioreactor, a hollow fiber membrane connected with a pressurized hydrogen source is distributed in the reactor, and hydrogen permeates from inside to outside through the hollow fiber membrane body for being utilized by microorganisms; in the hydrogen membrane biomembrane reactor, the hydrogen partial pressure in the membrane is controlled to be 1.25 +/-0.25 MPa, and the temperature is controlled to be 27 to 31 ℃; the hydrogen substrate anaerobic bioreactor is internally provided with a carbon dioxide aeration device for reducing the pH value by blowing carbon dioxide when the pH value of the sludge-water mixing system in the reactor is more than 11; and the hydraulic retention time in the continuous flow operation process of the hydrogen-based anaerobic bioreactor is controlled to be 10 to 20 hours.
2. The stable efficient short-cut denitrification process according to claim 1, wherein: the nitrogen concentration corresponding to nitrate in the nitrate-containing wastewater is 50 +/-5 mg/L.
3. The stable efficient short-cut denitrification process according to claim 1, wherein: the pH value of the muddy water mixing system in the hydrogen substrate anaerobic bioreactor is controlled to be 10.6 +/-0.1.
4. The utility model provides a stabilize high-efficient short-range denitrification processing apparatus which characterized in that: comprises an anaerobic membrane bioreactor and a pH adjusting device; the anaerobic membrane bioreactor is provided with a water inlet and a water outlet, and hollow fiber membranes are bunched in the inner cavity of the reactor; the membrane cavity of the hollow fiber membrane is communicated with a pressurized hydrogen source, so that hydrogen permeates from inside to outside through the hollow fiber membrane body and is used by microorganisms; the pH adjusting device comprises a pH detecting device and a carbon dioxide aeration device, wherein the pH detecting device is used for monitoring the pH of a mud-water mixture system in the reactor, and controlling the carbon dioxide aeration device to blow carbon dioxide into the reactor when the pH rises to exceed 11, so that the pH is reduced to be within a set control range of 10.5-11.
5. The stable high-efficiency short-cut denitrification processing device according to claim 4, wherein: the pressurized hydrogen source is a hydrogen cylinder or a hydrogen generator.
6. The stable high-efficiency short-cut denitrification processing device according to claim 4, wherein: the reactor adopts a water inlet and outlet mode that water enters from the bottom and overflows from the upper part.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6387262B1 (en) * | 2000-06-05 | 2002-05-14 | Northwestern University | Hollow-fiber membrane biofilm reactor for autohydrogenotrophic treatment of water |
| US7338597B1 (en) * | 2004-06-25 | 2008-03-04 | Northwestern University | Apparatus for water treatment |
| CN102992480A (en) * | 2012-12-17 | 2013-03-27 | 清华大学 | Device and process for carrying out autotrophic denitrification treatment on nitrate nitrogen in sewage based on non-foaming hydrogen supply |
| CN103359894A (en) * | 2013-08-06 | 2013-10-23 | 山东建筑大学 | Groundwater microbial denitrification system |
| CN111573830A (en) * | 2019-02-18 | 2020-08-25 | 桂林理工大学 | Device and method for deep denitrification by coupling anaerobic ammonia oxidation and hydrogen autotrophic denitrification |
-
2022
- 2022-05-05 CN CN202210480391.6A patent/CN114751515B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6387262B1 (en) * | 2000-06-05 | 2002-05-14 | Northwestern University | Hollow-fiber membrane biofilm reactor for autohydrogenotrophic treatment of water |
| US7338597B1 (en) * | 2004-06-25 | 2008-03-04 | Northwestern University | Apparatus for water treatment |
| CN102992480A (en) * | 2012-12-17 | 2013-03-27 | 清华大学 | Device and process for carrying out autotrophic denitrification treatment on nitrate nitrogen in sewage based on non-foaming hydrogen supply |
| CN103359894A (en) * | 2013-08-06 | 2013-10-23 | 山东建筑大学 | Groundwater microbial denitrification system |
| CN111573830A (en) * | 2019-02-18 | 2020-08-25 | 桂林理工大学 | Device and method for deep denitrification by coupling anaerobic ammonia oxidation and hydrogen autotrophic denitrification |
Non-Patent Citations (3)
| Title |
|---|
| 《Bioreduction of nitrate in a hydrogen-based membrane biofilm reactor using CO2 for pH control and as carbon source》;Siqing Xia等;《Chemical Engineering Journal》;第276卷;第59-64页 * |
| 《Effects of pH and precipitation on autohydrogenotrophic denitrification using the hollow-fiber membrane-biofilm reactor》;Kuan-Chun Lee等;《Water Research》;第37卷(第7期);第1551-1556页 * |
| 《氢自养反硝化系统中亚硝酸盐的累积特性》;陆彩霞等;《环境科学》;第29卷(第10期);第2830-2834页 * |
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