CN112591877A - Membrane bioreactor for denitrification and dephosphorization of dispersive sewage and sewage treatment method - Google Patents
Membrane bioreactor for denitrification and dephosphorization of dispersive sewage and sewage treatment method Download PDFInfo
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- CN112591877A CN112591877A CN202011548098.6A CN202011548098A CN112591877A CN 112591877 A CN112591877 A CN 112591877A CN 202011548098 A CN202011548098 A CN 202011548098A CN 112591877 A CN112591877 A CN 112591877A
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- reactor
- membrane bioreactor
- conductive medium
- dephosphorization
- denitrification
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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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
- C02F3/005—Combined electrochemical biological processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a membrane bioreactor for denitrification and dephosphorization of dispersive sewage and a sewage treatment method. The membrane bioreactor for the denitrification and dephosphorization of the dispersive sewage effectively reduces the resistivity of the mixed liquid of the reactor by introducing the low-cost conductive medium into the electrochemical membrane bioreactor, reduces the energy consumption required by the electrochemical reaction, realizes the sewage treatment effect of synchronously removing COD and nitrogen and phosphorus with lower energy consumption, and simultaneously causes the heterogeneous distribution of the oxidation-reduction potential in the reactor by the interaction between the conductive medium and the current, thereby effectively improving the removal effect of the total nitrogen.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a membrane bioreactor for denitrification and dephosphorization of dispersive sewage and a sewage treatment method.
Background
In recent years, the problem of water environment pollution caused by rural domestic sewage and aquaculture wastewater is widely concerned. Since sewage in suburbs and rural areas of vast cities is difficult to collect and concentrate, the decentralized sewage treatment technology becomes an important means for solving the problem. Compared with the traditional sewage treatment technology, the submerged membrane bioreactor has the characteristics of small occupied area, good treatment effect, low sludge yield, flexible operation and the like, and becomes a sewage treatment and regeneration technology which is concerned in recent years. Large membrane bioreactor technology has also achieved good commercial application over the past few decades. However, the membrane bioreactor still has a technical bottleneck in the aspect of the effect of removing nitrogen and phosphorus in the sewage. Submerged membrane bioreactors are reported to typically remove 30-67% of total nitrogen and 12-59% of total phosphorus in domestic wastewater. To compensate for the low removal of nitrogen and phosphorus, membrane bioreactors are often used in conjunction with one or several other treatment processes (e.g., anoxic or anaerobic/anoxic processes). This limits the flexibility of membrane bioreactors as modular or compact sewage treatment and regeneration systems and their potential for use in decentralized sewage treatment systems.
In recent years, researchers have improved the removal effect of organic matters and phosphorus in sewage and effectively controlled the development of membrane pollution by introducing an electrochemical reaction process auxiliary membrane bioreactor (called electrochemical membrane bioreactor). But the removal effect on the total nitrogen is still not ideal. At the same time, the higher running energy consumption also becomes the bottleneck of the commercial application of the technology. Therefore, the effective reduction of the operation energy consumption while not influencing or even enhancing the sewage treatment effect is the key of the future development of the electrochemical membrane bioreactor technology. The invention introduces the low-cost conductive medium into the electrochemical membrane bioreactor, namely the conductive moving bed membrane bioreactor is formed, and the sewage treatment effect of synchronously removing COD and nitrogen and phosphorus with lower energy consumption is realized.
Disclosure of Invention
In view of the above, the present invention is directed to a membrane bioreactor for denitrification and dephosphorization of decentralized wastewater and a wastewater treatment method, so as to simultaneously and efficiently remove COD and nitrogen and phosphorus in domestic wastewater.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a membrane bioreactor for removing nitrogen and phosphorus from dispersed sewage comprises a main body reactor, an anode plate and a cathode plate which are arranged in the main body reactor, and an immersed micro-filtration membrane component arranged between the anode plate and the cathode plate,
the main body reactor is communicated with the water inlet tank through a water inlet pipe, the main body reactor is filled with light conductive medium filler,
the anode plate and the cathode plate are respectively and electrically connected with the anode and the cathode of the adjustable DC stabilized voltage power supply,
and the water outlet of the immersed microfiltration membrane component is communicated with a water outlet pipe.
Preferably, the bottom of the main reactor is provided with an aeration device for suspending the light conductive medium filler in the liquid in the main reactor, and the aeration device is communicated with an air compressor.
Preferably, a water inlet pump is arranged on the water inlet pipe, and a water level sensor electrically connected with the water inlet pump is arranged in the main body reactor.
Preferably, a manometer and a water outlet pump are arranged on the water outlet pipe, and the water outlet pump and the adjustable direct current stabilized voltage power supply are respectively and electrically connected with a timer.
Preferably, the material of the light conductive medium filler is activated carbon coating sponge or activated carbon coating foam.
Preferably, the anode plate is made of a stainless steel plate with holes, and the cathode plate is made of an iron plate, an aluminum plate or a graphite thin plate with holes.
Preferably, the submerged microfiltration membrane component is a hollow fiber membrane component or a flat microfiltration membrane component.
A sewage treatment method applies any one of the membrane bioreactors, and comprises the following steps:
1) putting a light conductive medium filler into the main reactor, wherein the light conductive medium filler is suspended in the reactor solution in the main reactor;
2) inoculating sludge in the main reactor, and performing aeration culture for 1-2 weeks to make the biofilm adhere to the surface and the inner pores of the light conductive medium filler;
3) placing the anode plate, the cathode plate and the immersed microfiltration membrane component into a main reactor, and connecting an adjustable direct current stabilized power supply;
4) sewage flows into the main reactor from the water inlet tank through the water inlet tank, and the treated sewage is discharged from the water outlet pipe through the immersed microfiltration membrane component under aerobic conditions.
Preferably, the filling density of the light conductive medium filler in the step 1) is 20-40% (v/v).
Preferably, the current density in the step 3) is 10-20A/square meter, and the switching time ratio of the adjustable direct current stabilized power supply is 1/2, 2/2 or 2/1.
Compared with the prior art, the membrane bioreactor for the denitrification and dephosphorization of the dispersive sewage and the sewage treatment method have the following advantages:
the membrane bioreactor for the denitrification and dephosphorization of the dispersive sewage effectively reduces the resistivity of the mixed liquid of the reactor by introducing the low-cost conductive medium into the electrochemical membrane bioreactor, reduces the energy consumption required by the electrochemical reaction, realizes the sewage treatment effect of synchronously removing COD and nitrogen and phosphorus with lower energy consumption, and simultaneously causes the heterogeneous distribution of the oxidation-reduction potential in the reactor by the interaction between the conductive medium and the current, thereby effectively improving the removal effect of the total nitrogen.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a connection structure of a membrane bioreactor according to an embodiment of the present invention;
description of reference numerals:
1. a water inlet pool; 2. a main body reactor; 3. an immersed microfiltration membrane assembly; 4. an anode plate; 5. a cathode plate; 6. a lightweight conductive media filler; 7. an aeration device; 8. an air compressor; 9. a water level sensor; 10. an adjustable DC stabilized power supply; 11. a timer; 12. a water inlet pump; 13. discharging the water pump; 14. a pressure gauge;
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to the following examples and accompanying drawings.
A membrane bioreactor for denitrification and dephosphorization of dispersive sewage comprises a main body reactor 2, an anode plate 4 and a cathode plate 5 which are arranged in the main body reactor 2, and an immersed micro-filtration membrane component 3 which is arranged between the anode plate 4 and the cathode plate 5,
the main body reactor 2 is communicated with the water inlet tank 1 through a water inlet pipe, the water inlet pipe is provided with a water inlet pump 12, the main body reactor 2 is internally provided with a water level sensor 9 which is electrically connected with the water inlet pump 12, the main body reactor 2 is internally filled with a light conductive medium filler 6 to reduce the resistance of a mixed liquid and realize heterogeneous distribution of oxidation-reduction potential in the mixed liquid after the electrodes are electrified, the light conductive medium filler 6 is made of activated carbon coating sponge or activated carbon coating foam, the bottom of the main body reactor 2 is provided with an aeration device 7 which is used for suspending the light conductive medium filler 6 in the liquid in the main body reactor 2, the aeration device 7 is communicated with an air compressor 8, and the air compressor 8 is used for providing aeration for the reactor,
the anode plate 4 and the cathode plate 5 are respectively electrically connected with the anode and the cathode of the adjustable DC stabilized voltage power supply 10, the anode plate 4 is made of a stainless steel plate with holes, the cathode plate 5 is made of an iron plate, an aluminum plate or a graphite sheet with holes,
the water outlet of the immersed micro-filtration membrane component 3 is communicated with a water outlet pipe, the immersed micro-filtration membrane component 3 is a hollow fiber membrane component or a flat micro-filtration membrane component, the water outlet pipe is provided with a pressure gauge 14 and a water outlet pump 13, the water outlet pump 13 and the adjustable direct current stabilized voltage power supply 10 are respectively and electrically connected with a timer 11, the power-on/power-off time interval of the two electrodes is controlled by the timer 11, the work/stop circulation of the water outlet pump 13 is controlled by the timer 11, and the pressure gauge 14 is used for monitoring transmembrane pressure difference, and if the pressure difference is increased to a suggested value, the membrane surface needs to be.
The method for treating sewage by using the membrane bioreactor comprises the following steps:
1) putting a light conductive medium filler 6 into the main reactor 2, wherein the filling density of the light conductive medium filler 6 is 20-40% (v/v), and the light conductive medium filler 6 is suspended in the reactor solution in the main reactor 2;
2) inoculating sludge in the main reactor 2, and carrying out aeration culture for 1-2 weeks to make the biological membrane adhere to the surface of the light conductive medium filler 6 and the pores in the light conductive medium filler 6;
3) putting an anode plate 4, a cathode plate 5 and an immersed microfiltration membrane component 3 into a main body reactor 2, and connecting an adjustable direct current stabilized power supply 10;
4) the sewage to be treated is pumped into the main reactor 2 from the water inlet tank 1 by the water inlet pump 12, under the aerobic condition, the organic pollutants and nitrogen and phosphorus in the sewage are removed simultaneously by the suspended activated sludge and the biological membrane attached to the light conductive medium filler 6, and the treated sewage is discharged by the water outlet pump 13 through the immersed micro-filtration membrane component 3.
The sewage treatment effect is verified by setting 3 groups of examples and 1 group of proportion by taking domestic sewage of a certain university as sewage to be treated, wherein the COD of inlet water fluctuates within the range of 300-500mg/L, the total nitrogen is about 30m/L, and the total phosphorus is about 5 mg/L.
Example 1
When the membrane bioreactor for the denitrification and dephosphorization of the dispersive sewage is used, the time interval between the power-on and the power-off of the electrode is controlled to be 10min respectively (namely the power-on and power-off time ratio is 1/1) in the operation process, and the current intensity of the electrode plate is 15A/m2。
Example 2
The difference from the embodiment 1 is that in the operation process, the time intervals of the power-on and the power-off of the electrode are controlled to be respectively 5min and 10min (namely the power-on and power-off time ratio is 1/2), the current intensity of the electrode plate is 15A/m2。
Example 3
The difference from the example 1 is that in the operation process, the time interval between the power-on and the power-off of the electrode is controlled to be 10min respectively (namely the power-on and power-off time ratio is 1/1), and the current of the electrode plateStrength of 10A/m2。
Comparative example
The sewage is treated by using a conventional submerged membrane bioreactor.
The COD removal rate, TN removal rate and TP removal rate measured by testing the sewage treated in examples 1-3 and comparative example are shown in Table 1.
| Reactor type | COD removal rate | Removal rate of TN | TP removal Rate | Additional power consumption |
| Comparative example | 93％ | 65％ | 20％ | - |
| Example 1 | 97％ | 89％ | 99％ | 0.78kWh/m3 |
| Example 2 | 92％ | 81％ | 99％ | 0.52kWh/m3 |
| Example 3 | 97％ | 80％ | 99％ | 0.40kWh/m3 |
As can be seen from Table 1, by introducing a low-cost conductive medium into the electrochemical membrane bioreactor, the resistivity of the mixed liquid in the reactor is effectively reduced, the energy consumption required for realizing the electrochemical reaction is reduced, the sewage treatment effect of synchronously removing COD and nitrogen and phosphorus with lower energy consumption is realized, meanwhile, the interaction between the conductive medium and the current causes the heterogeneous distribution of the oxidation-reduction potential in the reactor, and the removal effect of the total nitrogen is effectively improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A membrane bioreactor for decentralized sewage nitrogen and phosphorus removal, its characterized in that: comprises a main body reactor, an anode plate, a cathode plate and an immersed micro-filtration membrane component, wherein the anode plate and the cathode plate are arranged in the main body reactor,
the main body reactor is communicated with the water inlet tank through a water inlet pipe, the main body reactor is filled with light conductive medium filler,
the anode plate and the cathode plate are respectively and electrically connected with the anode and the cathode of the adjustable DC stabilized voltage power supply,
and the water outlet of the immersed microfiltration membrane component is communicated with a water outlet pipe.
2. The membrane bioreactor for denitrification and dephosphorization of decentralized wastewater according to claim 1, wherein: the bottom of the main reactor is provided with an aeration device used for suspending the light conductive medium filler in the liquid in the main reactor, and the aeration device is communicated with an air compressor.
3. The membrane bioreactor for denitrification and dephosphorization of decentralized wastewater according to claim 1, wherein: the water inlet pipe is provided with a water inlet pump, and a water level sensor electrically connected with the water inlet pump is arranged in the main reactor.
4. The membrane bioreactor for denitrification and dephosphorization of decentralized wastewater according to claim 1, wherein: the water outlet pipe is provided with a manometer and a water outlet pump, and the water outlet pump and the adjustable direct current stabilized voltage power supply are respectively and electrically connected with a timer.
5. The membrane bioreactor for denitrification and dephosphorization of decentralized wastewater according to claim 1, wherein: the material of the light conductive medium filler is activated carbon coating sponge or activated carbon coating foam.
6. The membrane bioreactor for denitrification and dephosphorization of decentralized wastewater according to claim 1, wherein: the anode plate is made of a stainless steel plate with openings, and the cathode plate is made of an iron plate, an aluminum plate or a graphite thin plate with openings.
7. The membrane bioreactor for denitrification and dephosphorization of decentralized wastewater according to claim 1, wherein: the immersed micro-filtration membrane component is a hollow fiber membrane component or a flat micro-filtration membrane component.
8. A method for treating wastewater, wherein the membrane bioreactor according to any one of claims 1 to 7 is used, comprising the steps of:
1) putting a light conductive medium filler into the main reactor, wherein the light conductive medium filler is suspended in the reactor solution in the main reactor;
2) inoculating sludge in the main reactor, and performing aeration culture for 1-2 weeks to make the biofilm adhere to the surface and the inner pores of the light conductive medium filler;
3) placing the anode plate, the cathode plate and the immersed microfiltration membrane component into a main reactor, and connecting an adjustable direct current stabilized power supply;
4) sewage flows into the main reactor from the water inlet tank through the water inlet tank, and the treated sewage is discharged from the water outlet pipe through the immersed microfiltration membrane component under aerobic conditions.
9. The wastewater treatment method according to claim 8, characterized in that: the filling density of the light conductive medium filler in the step 1) is 20-40% (v/v).
10. The wastewater treatment method according to claim 8, characterized in that: in the step 3), the current density is 10-20A/square meter, and the switching time ratio of the adjustable direct current stabilized power supply is 1/2, 2/2 or 2/1.
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| CN202011548098.6A CN112591877A (en) | 2020-12-23 | 2020-12-23 | Membrane bioreactor for denitrification and dephosphorization of dispersive sewage and sewage treatment method |
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| CN202011548098.6A CN112591877A (en) | 2020-12-23 | 2020-12-23 | Membrane bioreactor for denitrification and dephosphorization of dispersive sewage and sewage treatment method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150001094A1 (en) * | 2012-02-08 | 2015-01-01 | Valorbec Societe En Commandite | Processes and apparatuses for removal of carbon, phosphorus and nitrogen |
| CN108658177A (en) * | 2018-05-07 | 2018-10-16 | 同济大学 | A kind of electro-chemical activity Carbon fibe felt membrane reactor of the removal of the hardly degraded organic substance suitable for water |
| CN110156145A (en) * | 2019-04-10 | 2019-08-23 | 同济大学 | A kind of model electrochemical fluidized bed micro-filtration membrane bioreactor and its application |
| CN111252887A (en) * | 2020-02-14 | 2020-06-09 | 北京化工大学 | Biofilm reactor for treating wastewater with low carbon-nitrogen ratio and refractory organic matters |
-
2020
- 2020-12-23 CN CN202011548098.6A patent/CN112591877A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150001094A1 (en) * | 2012-02-08 | 2015-01-01 | Valorbec Societe En Commandite | Processes and apparatuses for removal of carbon, phosphorus and nitrogen |
| CN108658177A (en) * | 2018-05-07 | 2018-10-16 | 同济大学 | A kind of electro-chemical activity Carbon fibe felt membrane reactor of the removal of the hardly degraded organic substance suitable for water |
| CN110156145A (en) * | 2019-04-10 | 2019-08-23 | 同济大学 | A kind of model electrochemical fluidized bed micro-filtration membrane bioreactor and its application |
| CN111252887A (en) * | 2020-02-14 | 2020-06-09 | 北京化工大学 | Biofilm reactor for treating wastewater with low carbon-nitrogen ratio and refractory organic matters |
Non-Patent Citations (1)
| Title |
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| 梁天成: "《矿井水处理技术及标准规范实用手册上》", 30 November 2004, 当代中国音像出版社 * |
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Application publication date: 20210402 |