CN111995055A - Two segmentation SBR reaction equipment of denitrifying phosphorus removal fungus enrichment fast - Google Patents
Two segmentation SBR reaction equipment of denitrifying phosphorus removal fungus enrichment fast Download PDFInfo
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- CN111995055A CN111995055A CN202010982707.2A CN202010982707A CN111995055A CN 111995055 A CN111995055 A CN 111995055A CN 202010982707 A CN202010982707 A CN 202010982707A CN 111995055 A CN111995055 A CN 111995055A
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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
- C02F2209/04—Oxidation reduction potential [ORP]
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- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/00—Controlling or monitoring parameters in water treatment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses two-stage SBR reaction equipment for rapidly enriching denitrifying phosphorus removal bacteria. The invention applies a special two-stage water inlet mode to selectively proliferate microorganisms, can fully separate an electron donor from an electron acceptor, avoids the competition between other floras such as denitrifying bacteria and denitrifying phosphorus removal bacteria for the electron donor and the electron acceptor, ensures that phosphorus accumulating bacteria (mainly DPB) obtain competitive advantage in an anaerobic stage, ensures that the phosphorus accumulating bacteria colony can be selectively proliferated in a system, and simultaneously improves the organic load of inlet water to accelerate the growth speed of the microorganisms. The equipment has the advantages of stable operation, reduction of additional organic carbon sources and aeration cost, less residual sludge, high microorganism abundance, capability of realizing rapid enrichment of denitrifying phosphorus removal bacteria (DPB), and the like.
Description
Technical Field
The invention belongs to the field of water pollution control, and relates to two-stage SBR reaction equipment for rapidly enriching denitrifying phosphorus removal bacteria.
Background
With the continuous development of society, the content of nitrogen and phosphorus in industrial and agricultural wastewater and urban domestic sewage is higher and higher. A large amount of nitrogen and phosphorus sewage which is not properly treated is directly discharged into a water body, so that a large amount of water body environment eutrophication is seriously caused, the health of human beings is threatened, and the sustainable development of the society is also seriously restricted. Various sewages have high content of phosphorus and nitrogen elements, and the C/N/P ratio is disordered under most conditions, thereby bringing about a plurality of difficulties for the harmless treatment of the sewage.
The traditional biological nitrogen and phosphorus removal method has a certain effect on sewage treatment and still has a plurality of bottlenecks. Such as: competition of phosphorus accumulating bacteria and denitrifying bacteria for carbon sources always exists; the nitrifying bacteria, the denitrifying bacteria and the phosphorus-accumulating bacteria have different ages, and various bacteria are mixed together and mutually restricted, so that the system is difficult to reach the optimal operation condition; for sewage with disordered C/N/P ratio, an organic carbon source is additionally added; the aerobic biological phosphorus removal process increases power consumption and can generate a large amount of excess sludge; the whole treatment process has the advantages of longer flow, large occupied area, high investment and the like.
With the continuous improvement of sewage treatment technology, several novel biological nitrogen and phosphorus removal processes have been developed and applied in recent years, mainly including: the synchronous nitrification and denitrification process, the short-cut nitrification and denitrification process, the anaerobic ammonia oxidation process, the whole autotrophic nitrogen removal process and the denitrification and phosphorus removal process have the advantages of low energy consumption, reduction of additional organic carbon sources, small residual sludge yield, small occupied area and the like. Particularly, the denitrification dephosphorization process enables two independent processes of dephosphorization and denitrification to be simultaneously completed under the participation of denitrifying phosphorus removal bacteria (DPB) and only under the anoxic environment, the combination of the processes of phosphorus absorption and denitrification not only reduces the need of carbon sources, but also can reduce the energy required by aeration when the phosphorus absorption is completed in the anoxic environment, and the generated residual sludge amount is greatly reduced. Therefore, the denitrification dephosphorization technology becomes one of the key points and hot spots in the current sewage dephosphorization and denitrification research field. Based on the denitrification dephosphorization theory, successively put forward A2N and Dephanox and the like adopt a novel side-stream nitrification/anaerobic/anoxic biological nitrogen and phosphorus removal process to realize the high-efficiency and low-consumption removal of nitrogen and phosphorus in sewage. Compared with aerobic phosphorus removal, the denitrifying phosphorus removal is low in speed and phosphorus removal amount, DPB is difficult to enrich, and the denitrifying phosphorus removal rate is reduced in a system running for a long time. Therefore, how to maintain the advantages of DPB and realize long-term efficient operation of denitrifying phosphorus removal has become an urgent problem to be solved in this research field.
Aiming at the situations, research and development of novel reaction equipment and a novel technology which have the advantages of simple structure, low consumption, high efficiency, easy operation and management, stable operation, capability of realizing rapid enrichment of DPB, realizing denitrification and dephosphorization for a long time, maintaining the activity of DPB and keeping the advantages of DPB have become a necessary way for the development of sewage denitrification and dephosphorization treatment.
Disclosure of Invention
The invention aims to provide a compound which can be A2An SBR reaction device for rapidly enriching DPB by denitrifying phosphorus removal processes such as N and Dephanox.
The invention adopts a two-stage water inlet mode to selectively proliferate microorganisms and realize the rapid enrichment of DPB. The two-stage water inlet mode can fully separate a carbon source (electron donor) from a nitrate (electron acceptor), and can avoid the competition of other floras such as denitrifying bacteria and DPB for the electron donor and the electron acceptor, so that the phosphorus accumulating bacteria (mainly DPB) obtain competitive advantages in the anaerobic stage, and selective appreciation is achieved in the system. In addition, under the condition of a certain inlet water concentration, the nutrient load of the sludge is increased, the bacterial proliferation speed can be accelerated, and finally the system achieves a good denitrification dephosphorization effect. The invention has the advantages of rapid enrichment of DPB, simple and stable operation, high volume utilization rate, high microorganism abundance, no need of aeration, less residual sludge, no need of alkalinity adjustment, low operation cost and the like.
The invention is provided with An anaerobic/anoxic (A/An) SBR reaction device which continuously operates according to An anaerobic/anoxic (A/An) alternating mode. The time ratio of the anaerobic section to the anoxic section is between 0.5 and 0.7, each period is 6 to 8 hours, and 2 times of water feeding and 2 times of water discharging (namely a two-section water feeding mode) are carried out. The specific operation mode is as follows: and (2) after water is fed from a carbon source water inlet tank for 1 time, anaerobic stirring is carried out, the carbon source in the water is absorbed by denitrifying phosphorus removal bacteria to synthesize PHB in vivo, the PHB is fully released, the precipitate is discharged after 30-45min, then water is fed from a nitrogen and phosphorus source water inlet tank for 2 times, anoxic stirring is carried out, and at the moment, in a low-carbon source environment, PHB in a DPB decomposer is subjected to excessive absorption on phosphorus in sewage by taking NO 3-as an electron acceptor. Precipitating for 30-45min, and draining. The system sludge age (SRT) is controlled to be about 15-17d, and the sludge concentration (MLSS) in the SBR reaction device is controlled to be 2500-3500 mg/L.
The side wall of the device is provided with an oxidation-reduction potential (ORP) probe mounting tube and a pH probe mounting tube, the whole reactor is heated by winding a resistance wire on the surface of the whole reactor, and the temperature of the whole reactor is kept at a constant temperature of 30 +/-1 ℃ by a temperature controller.
Auxiliary part of the invention
1. Gas collection and transmission device
In order to ensure that the gas generated in the operation process of the device can be discharged in time and the anaerobic/anoxic condition of the device is ensured, a water sealing device is arranged between a gas discharge port and the wet gas flowmeter, and the pipe diameter is larger so as to prevent the solid (or foam) carried by the gas from being blocked. Experience shows that there is an accumulation of condensate in the water seal. Therefore, an outlet for removing condensed water is arranged in the water seal so as to maintain a certain water level in the system.
2. Sludge discharge device
The treatment effect is enhanced with the increase of the sludge concentration in the reactor, but after the sludge exceeds a certain concentration, the excess sludge is removed to optimize the effluent effect. Therefore, the equipment periodically discharges the sludge with low activity at regular intervals, and retains the sludge with high activity in the reactor. The bottom of the two-section SBR reaction device is provided with a sludge discharge pipe which can be used as a sludge sample sampling port.
ORP, pH Probe mounting tube
In order to examine the change of oxidation-reduction potential (ORP) and pH value of the two-section SBR reaction device in the anaerobic/anoxic alternative operation process, an ORP probe mounting tube and a pH probe mounting tube are arranged in the middle of the side wall of the device, so that the change of the ORP and the pH value in the reaction device along with the operation time can be monitored on line.
4. Heating and insulating facility
In view of the fact that the denitrifying phosphorus removal bacteria have the best microbial activity under the condition of medium temperature, the temperature of the system is maintained within the range of 30 +/-1 ℃ by a temperature controller in a mode of winding electric heating wires on the surface of the reactor for heating.
Start-up and steady operation portions of the present invention
1. Starting of the apparatus
The reactor is inoculated with the activated sludge of the municipal sewage plant with a certain concentration, and then the water feeding operation is started. The equipment is started and operated by adopting artificial simulation sewage to reduce the influence of other factors, and the key parameter control conditions for realizing the rapid enrichment of denitrifying phosphorus removal bacteria during starting and the key parameter control conditions for ensuring the advantages of DPB populations and maintaining the activity of DPB during stable operation are proved.
2. Determining effluent index monitoring process parameters and regulating engineering in the running process of equipment.
The items to be monitored and controlled during operation are mainly shown in table 1.
As can be seen from table 1, wherein: COD and NO3 --N、NO2 --N、PO4 3-Parameters such as-P, TN, TP and total gas production amount can reflect the enrichment effect and the running state of denitrifying phosphorus removal bacteria, pollutants (particularly phosphorus) and the change condition along with the control condition. MLSS, SV and SVI can preliminarily judge the change of the sedimentation performance of the sludge in the equipment along with the control condition and the form and structure composition of the sludge under the condition of enrichment of denitrifying phosphorus removal bacteria. The operation state of the reaction equipment can be optimized by regulating and controlling parameters such as pH value, alkalinity, oxidation-reduction potential (ORP), DO and the like.
TABLE 1 Main analysis items and analysis methods
3. Stable operation of the plant
After the reactor is started, various operation parameters are ensured to be stable through stable maintenance operation.
Compared with the prior art, the invention has the following advantages:
1. the rapid enrichment of denitrifying phosphorus removal bacteria is realized, so that the rapid starting and stable operation of novel denitrifying phosphorus removal and denitrification processes (such as A2N process and Dephanox process) for treating low carbon ratio sewage and municipal sewage are realized. The invention uses a special two-stage water inlet mode to selectively proliferate microorganisms, thereby realizing the rapid enrichment of denitrifying phosphorus removal bacteria. On one hand, the method can fully separate a carbon source (electron donor) from a nitrate (electron acceptor), can avoid competition between other floras such as denitrifying bacteria and denitrifying phosphorus removal bacteria for the electron donor and the electron acceptor, and enables phosphorus removal bacteria (mainly DPB) to obtain competitive advantage in an anaerobic stage, so that the phosphorus removal bacteria can be selectively added in the system, on the other hand, the nutrient load of sludge can be increased under the condition of certain water inlet concentration, the bacterial proliferation speed is accelerated, and finally the system achieves good denitrifying phosphorus removal effect.
2. The additional organic carbon source, the aeration amount and the residual sludge discharge amount are reduced, and the operation cost is reduced. The invention adopts An anaerobic/anoxic (A/An) alternate operation mode, and denitrifying phosphorus removal bacteria in the equipment can simultaneously complete two independent processes of phosphorus accumulation and denitrification only in An anoxic environment, thereby reducing the requirement of microorganisms on a carbon source, reducing the yield of residual sludge, and reducing the consumption of aeration when the phosphorus accumulation is completed under the anoxic condition.
3. The abundance of the microorganisms is high. The invention can form granular sludge by adjusting the rotating speed and the settling time of the stirrer to enhance the sludge retention amount and strengthen the denitrification dephosphorization function of the granular sludge, thereby further improving the treatment effect of the invention.
Drawings
FIG. 1 is a block diagram of the present invention.
Detailed Description
The details are shown in the attached figure 1 of the specification. In the operation process of the device, the anaerobic section: pumping carbon source sewage into a water inlet at the top of the equipment through a water inlet pump, and finally discharging outlet water from a water outlet of the equipment through a water outlet pump after the reaction is finished under the action of a stirrer; and a post-anoxic section: nitrogen phosphorus source sewage is pumped into the water inlet of the device through the water inlet pump, and after the reaction is completed under the action of the stirrer, the water is finally discharged from the water outlet through the water outlet pump. The gas generated by the device is exhausted from the top exhaust hole, and the gas generation rate of the system can be measured by the wet gas flowmeter.
The device comprises a two-stage SBR reactor 1, a carbon source water inlet pump 2, a nitrogen and phosphorus source water inlet pump 3, a liquid level meter 4, a stirrer 5, a control panel 6, a water outlet pump 7, a heating device 8, a temperature controller 9 and a water seal device 10.
The first embodiment is as follows: two segmentation SBR reactors (1) link to each other with carbon source intake pump (2), nitrogen phosphorus source intake pump (3) respectively, at the anaerobism section: a carbon source water inlet pump (2) pumps carbon source sewage into the two-stage SBR reactor (1), the carbon source sewage reacts under the stirring action of the stirrer (5), and precipitation and drainage are carried out after the reaction; in the anoxic zone: and a nitrogen and phosphorus source water inlet pump (3) pumps nitrogen and phosphorus source sewage into the two-section SBR reactor (1), and the nitrogen and phosphorus source sewage reacts under the stirring action of the stirrer (5) to precipitate and drain water after the reaction. The special two-stage water inlet mode can fully separate a carbon source (an electron donor) from a nitrate (an electron acceptor), can avoid the competition between other floras such as denitrifying bacteria and denitrifying phosphorus removal bacteria for the electron donor and the electron acceptor, and ensures that the denitrifying phosphorus removal bacteria obtain the competitive advantage in the anaerobic stage, thereby selectively proliferating the denitrifying phosphorus removal floras in the system, and in addition, the nutrient load of sludge can be improved under the condition of certain water inlet concentration, and the proliferation rate of microorganisms is accelerated. The gas generated in the two-stage SBR reactor (1) is discharged from a gas collecting pipe (1-4) at the top. The side wall of the two-stage SBR reactor (1) is averagely provided with 3 sampling tubes (1-7) according to the height, the bottom is provided with a sludge discharge tube (1-8), and the other side wall is provided with an ORP probe mounting tube (1-9) and a pH probe mounting tube (1-10) which can monitor the change of ORP and pH value in the two-stage SBR reactor (1) on line by arranging an ORP meter and a pH meter.
The second embodiment is as follows: the present embodiment is described with reference to fig. 1, and a heating device 8 and a temperature controller 9 are added to the present embodiment; the heating device 8 is arranged on the outer surface of the reactor 1, and the two-section SBR reactor 1 is heated by the heating device 8, so that the biological treatment effect is better. The temperature controller 9 is connected with the heating device 8, the microbial activity of the denitrifying phosphorus-accumulating bacteria is optimal under the condition of medium temperature, the temperature of the heating device 8 is controlled by the temperature controller to ensure that the denitrifying phosphorus-accumulating bacteria achieves the optimal activity, and the temperature of the two-section SBR reactor 1 is kept within the range of 30 +/-1 ℃.
The third concrete implementation mode: the embodiment is described by combining fig. 1, and forms granular sludge in the two-stage cylindrical SBR reactor by adjusting the rotating speed of the stirrer 5 and controlling the precipitation water-outlet time, so that the biological interception amount of the reaction equipment can be obviously increased, the hydraulic dead zone in the reactor can be effectively reduced, and the treatment effect on nitrogen and phosphorus elements in sewage can be improved. Other components and connection relationships are the same as those in the first embodiment.
Claims (4)
1. The utility model provides a two segmentation SBR reaction equipment of denitrating dephosphorization fungus enrichment fast which characterized in that: two segmentation SBR reactors (1) link to each other with carbon source intake pump (2), nitrogen phosphorus source intake pump (3) respectively, at the anaerobism section: a carbon source water inlet pump (2) pumps carbon source sewage into the two-stage SBR reactor (1), and a stirrer (5) is used for stirring and then precipitating and draining water; in the anoxic zone: a nitrogen and phosphorus source water inlet pump (3) pumps nitrogen and phosphorus source sewage into the two-stage SBR reactor (1), and a stirrer (5) is used for stirring and then precipitating and draining water;
gas generated in the two-section SBR reactor (1) is discharged through a top gas collecting pipe (1-4);
the side wall of the two-section reactor (1) is averagely provided with 3 sampling tubes (1-7) according to the height, the bottom is provided with a sludge discharge tube (1-8), and the other side wall is provided with an ORP probe mounting tube (1-9) and a pH probe mounting tube (1-10) for monitoring the change of ORP and pH value in the system on line.
2. The two-stage SBR reaction equipment for rapidly enriching the denitrifying phosphorus-removing bacteria according to claim 1, which is characterized in that sewage is pumped into a cylindrical reactor in a two-stage water inlet mode, and microorganisms are selectively proliferated.
3. The two-stage SBR reaction equipment for rapidly enriching the denitrifying phosphorus-removing bacteria according to claim 1, which is characterized in that a temperature controller (9) is additionally arranged; the temperature controller (9) is connected with a heating device (8) on the outer surface of the reactor (1).
4. The two-stage SBR reaction equipment for rapidly enriching the denitrifying phosphorus-removing bacteria according to claim 1, which is characterized in that granular sludge is formed in the A/An SBR reactor (1) by adjusting the rotating speed of a stirrer (5) and controlling the precipitation and water-out time.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113526664A (en) * | 2021-08-05 | 2021-10-22 | 北京科技大学 | System for rapidly enriching denitrifying phosphorus accumulating bacteria and operation method |
| CN113666493A (en) * | 2021-08-16 | 2021-11-19 | 天津大学 | Anaerobic/anoxic denitrification phosphorus removal bacteria biomembrane reaction method and equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120067816A1 (en) * | 2010-09-20 | 2012-03-22 | American Water Works Company, Inc. | Simultaneous anoxic biological phosphorus and nitrogen removal |
| CN102531161A (en) * | 2010-12-13 | 2012-07-04 | 中国科学院城市环境研究所 | Rapid enrichment reaction device for denitrifying phosphorus removing bacteria |
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2020
- 2020-09-17 CN CN202010982707.2A patent/CN111995055A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120067816A1 (en) * | 2010-09-20 | 2012-03-22 | American Water Works Company, Inc. | Simultaneous anoxic biological phosphorus and nitrogen removal |
| CN102531161A (en) * | 2010-12-13 | 2012-07-04 | 中国科学院城市环境研究所 | Rapid enrichment reaction device for denitrifying phosphorus removing bacteria |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113526664A (en) * | 2021-08-05 | 2021-10-22 | 北京科技大学 | System for rapidly enriching denitrifying phosphorus accumulating bacteria and operation method |
| CN113666493A (en) * | 2021-08-16 | 2021-11-19 | 天津大学 | Anaerobic/anoxic denitrification phosphorus removal bacteria biomembrane reaction method and equipment |
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