CN119504027B - Alternating continuous flow aerobic granular sludge culture system - Google Patents
Alternating continuous flow aerobic granular sludge culture system Download PDFInfo
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- CN119504027B CN119504027B CN202411830994.XA CN202411830994A CN119504027B CN 119504027 B CN119504027 B CN 119504027B CN 202411830994 A CN202411830994 A CN 202411830994A CN 119504027 B CN119504027 B CN 119504027B
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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
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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
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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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
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Abstract
The invention provides an alternating continuous flow aerobic granular sludge culture system which comprises a first alternating pool, a second alternating pool and a facultative pool, wherein the first alternating pool and the second alternating pool are alternately used as a sedimentation pool and a reaction pool, a secondary sedimentation pool is not needed, and the utilization rate of a structure is improved. The first water distribution pipe and the second water distribution pipe distribute the inlet water to the bottom to be in preferential contact with the sludge, thereby creating a high-load feast environment. The sludge in the first alternate pond and the sludge in the second alternate pond are alternately in feast and hunger states, so that the formation of granular sludge is promoted. The first alternating pool and the second alternating pool are intermittently in anaerobic, aerobic and anoxic states, the facultative pool is intermittently in aerobic and anoxic states, and pollutants in sewage can be removed without arranging a reflux device, so that the damage of power equipment to a granular sludge structure is avoided. The first alternate pool and the second alternate pool alternately feed water, and the facultative tank alternately aerates and stirs, so that anaerobic, aerobic and anoxic alternate operation is realized, and the denitrification and dephosphorization performance can be improved.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an alternating continuous flow aerobic granular sludge culture system.
Background
The aerobic granular sludge (aerobic granular sludge) is a granular microorganism aggregate formed by self-agglomeration of microorganisms under special conditions, and has the advantages of synchronous denitrification and dephosphorization, compact structure, good sludge sedimentation performance, high biomass, strong shock resistance and the like which are difficult to compare with the common activated sludge method. The aerobic granular sludge technology is considered as a low-carbon high-efficiency innovation technology in the sewage treatment industry due to the obvious engineering advantages of land occupation, low energy consumption, high efficiency and the like, meets the technical requirements of China in the current sewage treatment field, can meet the standard-raising and consumption-reducing requirements of the sewage treatment industry, helps to solve the water environment pollution problem, and is one of the sewage treatment technologies with the most development potential.
The aerobic granular sludge technology is widely applied to the intermittent sewage treatment technology, and the intermittent aerobic granular sludge technology with different scales at home and abroad realizes engineering application. In the continuous flow sewage treatment process, the plug flow type water inlet mode is adopted, so that the concentration gradient of the substrate is small, the mass transfer power of pollutants is small, and the cultivation and the stable maintenance of aerobic granular sludge are not facilitated. In order to realize the denitrification and dephosphorization functions, anaerobic, anoxic and aerobic areas are required to be arranged in a partitioning way, and a secondary sedimentation tank is arranged to realize the mud-water separation of the mixed liquid, so that the traditional activated sludge process has more structures and low structure utilization rate. The nitrifying liquid reflux system and the sludge reflux system can damage the structure of the sludge and influence the stability of the granular sludge.
Disclosure of Invention
The invention aims to provide an alternating continuous flow aerobic granular sludge culture system which solves the problems of poor sedimentation performance, small particle size, easy breakage, poor denitrification and dephosphorization performance and low utilization rate of structures of the existing continuous flow activated sludge.
To achieve the above object, in a first aspect, the present invention provides an alternating continuous flow aerobic granular sludge culture system, comprising:
The first alternating pool is provided with a first water distribution unit, a first supernatant collecting unit and a first aeration unit, the first water distribution unit is arranged at the top of the first alternating pool, a plurality of first water distribution pipes are connected below the first water distribution unit, the first water distribution pipes extend to the bottom of the first alternating pool, the first water distribution unit is also provided with a first raw water inlet and a first mixed liquid inlet, the first supernatant collecting unit is provided with a first supernatant outlet, and the first alternating pool is also provided with a first mud outlet and a first mixed liquid outlet;
The second alternating pond is internally provided with a second water distribution unit, a second supernatant collecting unit and a second aeration unit, a plurality of second water distribution pipes are connected below the second water distribution unit, the second water distribution pipes extend to the bottom of the second alternating pond, the second water distribution unit is also provided with a second raw water inlet and a second mixed liquid inlet, the second supernatant collecting unit is provided with a second supernatant water outlet, and the second alternating pond is also provided with a second mud discharge port and a second mixed liquid outlet;
The facultative tank is provided with a stirrer, a third aeration unit, a third raw water inlet, a third mixed liquid outlet, a fourth mixed liquid outlet, a third mixed liquid inlet and a fourth mixed liquid inlet, wherein the third mixed liquid outlet is connected with the first mixed liquid inlet through a first mixed liquid valve, the fourth mixed liquid outlet is connected with the second mixed liquid inlet through a second mixed liquid valve, the third mixed liquid inlet is connected with the first mixed liquid outlet through a third mixed liquid valve, and the fourth mixed liquid inlet is connected with the second mixed liquid outlet through a fourth mixed liquid valve.
Optionally, the first water distribution unit and the second water distribution unit are both water distribution weirs.
Optionally, the first supernatant collecting unit and the second supernatant collecting unit are both air weirs;
the first supernatant collecting unit is also provided with a first air inlet and a first air outlet, the first air inlet is provided with a first air inlet valve, and the first air outlet is provided with a first air outlet valve;
the second supernatant collecting unit is provided with a second air inlet and a second air outlet, the second air inlet is provided with a second air inlet valve, and the second air outlet is provided with a second air outlet valve.
Optionally, the alternating continuous flow aerobic granular sludge culture system further comprises:
and the air compressor is connected with the first air inlet valve and the second air inlet valve.
Optionally, the first supernatant outlet is provided with a first supernatant outlet valve;
the first mud discharge port is provided with a first mud discharge valve;
the second supernatant water outlet is provided with a second supernatant water outlet valve;
the second mud discharging port is provided with a second mud discharging valve.
Optionally, the alternating continuous flow aerobic granular sludge culture system further comprises:
The raw water tank is internally provided with a water pump, the water pump is connected with the first raw water inlet, the second raw water inlet and the third raw water inlet through water supply pipelines, the first raw water inlet is provided with a first raw water inlet valve, the second raw water inlet is provided with a second raw water inlet valve, and the third raw water inlet is provided with a third raw water inlet valve.
Optionally, the first aeration unit, the second aeration unit and the third aeration unit are aeration discs, the first aeration unit is provided with a first aeration inlet, the second aeration unit is provided with a second aeration inlet, and the third aeration unit is provided with a third aeration inlet.
Optionally, the alternating continuous flow aerobic granular sludge culture system further comprises:
The air blower is connected with the first aeration inlet, the second aeration inlet and the third aeration inlet, the first aeration inlet is provided with a first aeration valve, the second aeration inlet is provided with a second aeration valve, and the third aeration inlet is provided with a third aeration valve.
Optionally, the first aeration unit is arranged at the bottom of the first alternating pool;
the second aeration unit is arranged at the bottom of the second alternating pool;
the third aeration unit is arranged at the bottom of the facultative tank.
Optionally, the alternating continuous flow aerobic granular sludge culture system further comprises a control unit, wherein the control unit is electrically connected with the first mixed liquor valve, the second mixed liquor valve, the third mixed liquor valve, the fourth mixed liquor valve, the first air inlet valve, the first air outlet valve, the second air inlet valve, the second air outlet valve, the air compressor, the first supernatant water outlet valve, the first mud discharge valve, the second supernatant water outlet valve, the second mud discharge valve, the water pump, the first raw water inlet valve, the second raw water inlet valve, the third raw water inlet valve, the blower, the first aeration valve, the second aeration valve, the third aeration valve and the stirrer.
In a second aspect, the invention provides an alternative continuous flow aerobic granular sludge culture method, which utilizes the alternative continuous flow aerobic granular sludge culture system in the first aspect, and comprises the following steps:
Step 1, introducing sewage into the first alternating pool and distributing the sewage to the bottom, introducing the sewage at the top of the first alternating pool into the facultative pool, introducing mixed liquor of the facultative pool into the second alternating pool, discharging supernatant of the second alternating pool out of the system, and continuously operating for a first set time;
step 2, aerating in a first alternating pool, introducing a muddy water mixed solution into the facultative pool, introducing the mixed solution in the facultative pool into a second alternating pool, and continuously operating for a second set time;
step 3, stopping water inflow of the first alternating pool, continuing aeration, introducing sewage into the facultative tank, stirring, introducing mixed solution in the facultative tank into the second alternating pool, and continuously running for a third set time;
Step 4, stopping aeration of the first alternating pool and discharging the precipitated residual sludge, stopping stirring and aerating the facultative tank, and introducing the muddy water mixed solution in the facultative tank into the second alternating pool to continuously run for a fourth set time;
Step 5, introducing sewage into the second alternating pool and distributing the sewage to the bottom, stopping water inflow of the facultative pool and continuing aeration, introducing mixed solution of the facultative pool into the first alternating pool, discharging supernatant of the first alternating pool out of the system, and continuously operating for a fifth set time;
Step 6, the second alternating pool is aerated, muddy water mixed solution is led into the facultative tank, mixed solution of the facultative tank is led into the first alternating pool, and the sixth set time is continuously operated;
Step 7, stopping water inflow of the second alternating pool, continuing aeration, introducing sewage into the facultative tank, stirring, introducing mixed solution in the facultative tank into the first alternating pool, and continuously running for a seventh set time;
Step 8, stopping aeration in the second alternating pond, discharging the precipitated residual sludge, stopping stirring in the facultative tank, starting aeration, introducing the muddy water mixed solution in the facultative tank into the first alternating pond, and continuously running for an eighth set time;
And 9, circularly repeating the steps 1 to 8.
The invention has the beneficial effects that the alternating continuous flow aerobic granular sludge culture system comprises the first alternating pond, the second alternating pond and the facultative pond, wherein the first alternating pond and the second alternating pond can be alternately used as a sedimentation pond and a reaction pond, a secondary sedimentation pond is not required to be arranged independently, and the utilization rate of a structure is improved. The first water distribution pipe and the second water distribution pipe can distribute raw water to the bottoms of the first alternating pool and the second alternating pool, and inlet water is in preferential contact with sludge, so that a high-load feast environment is created. The sludge in the first alternate pond and the sludge in the second alternate pond are alternately in feast and hunger states, and a feast-hunger alternate environment is formed in time and space, so that EPS secretion is facilitated, and the formation of granular sludge is promoted. The first alternate tank and the second alternate tank are intermittently in anaerobic, aerobic and anoxic states, the facultative tank is intermittently in aerobic and anoxic states, a sludge reflux and nitrifying liquid reflux system is not required to be arranged, the removal of pollutants such as carbon, nitrogen and phosphorus in sewage can be realized, power equipment is reduced, energy consumption is reduced, and the damage of power equipment such as a reflux pump to a granular sludge structure is avoided. The first alternate pool and the second alternate pool alternately feed water, and the facultative tank alternately aerates and stirs, so that anaerobic, aerobic and anoxic alternate operation is realized, and the denitrification and dephosphorization performance can be improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 shows a schematic block diagram of an alternating continuous flow aerobic granular sludge culture system according to an embodiment of the present invention.
Fig. 2 shows a flow chart of an alternate continuous flow aerobic granular sludge culture method according to an embodiment of the invention.
FIG. 3 shows a sludge particle size distribution diagram of a biological pond during steady operation of an alternating continuous flow aerobic granular sludge culture system according to one embodiment of the present invention.
Reference numerals illustrate:
1. A first alternating pool; 11, a first water distribution unit, 111, a first raw water inlet, 112, a first raw water inlet valve, 113, a first mixed liquid inlet, 114, a first water distribution pipe, 12, a first supernatant collecting unit, 121, a first supernatant water outlet, 122, a first supernatant water outlet valve, 13, a first aeration unit, 131, a first aeration inlet, 132, a first aeration valve, 141, a first mud discharge port, 142, a first mud discharge valve, 143, a first mixed liquid outlet, 144, a first air inlet, 145, a first air inlet valve, 146, a first air outlet, 147, a first air outlet valve;
2. The second alternating pond, 21, a second water distribution unit, 211, a second raw water inlet, 212, a second raw water inlet valve, 213, a second mixed liquid inlet, 214, a second water distribution pipe, 22, a second supernatant collecting unit, 221, a second supernatant outlet, 222, a second supernatant outlet valve, 23, a second aeration unit, 231, a second aeration inlet, 232, a second aeration valve, 241, a second mud discharge outlet, 242, a second mud discharge valve, 243, a second mixed liquid outlet, 244, a second air inlet, 245, a second air inlet valve, 246, a second air outlet, 247, a second air outlet valve;
3. The aeration tank comprises a facultative tank body, a 31, a third aeration unit, a 311, a third aeration inlet, a 322, a third aeration valve, a 32, a stirrer, a 331, a third raw water inlet, a 332, a third raw water inlet valve, a 333, a third mixed liquor outlet, a 334, a first mixed liquor valve, a 335, a fourth mixed liquor outlet, a 336, a second mixed liquor valve, a 337, a third mixed liquor inlet, a 338, a third mixed liquor valve, a 339, a fourth mixed liquor inlet, a 340, a fourth mixed liquor valve;
4. Raw water pool 41, water pump 42, water supply pipeline;
5. an air compressor;
6. a blower;
7. and a control unit.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, this embodiment provides an alternating continuous flow aerobic granular sludge culture system, which includes:
The first alternating pond 1, the first alternating pond 1 is provided with a first water distribution unit 11, a first supernatant collecting unit 12 and a first aeration unit 13, the first water distribution unit 11 is arranged at the top of the first alternating pond 1, a plurality of first water distribution pipes 114 are connected below the first water distribution unit 11, the first water distribution pipes 114 extend to the bottom of the first alternating pond 1, the first water distribution unit 11 is also provided with a first raw water inlet 111 and a first mixed liquid inlet 113, the first supernatant collecting unit 12 is provided with a first supernatant outlet 121, and the first alternating pond 1 is also provided with a first mud discharge port 141 and a first mixed liquid outlet 143;
The second alternating tank 2 is internally provided with a second water distribution unit 21, a second supernatant collecting unit 22 and a second aeration unit 23, a plurality of second water distribution pipes 214 are connected below the second water distribution unit 21, the second water distribution pipes 214 extend to the bottom of the second alternating tank 2, the second water distribution unit 21 is also provided with a second raw water inlet 211 and a second mixed liquid inlet 213, the second supernatant collecting unit 22 is provided with a second supernatant outlet 221, and the second alternating tank 2 is also provided with a second mud discharging port 241 and a second mixed liquid outlet 243;
facultative tank 3, facultative tank 3 is provided with third aeration unit 31, third raw water inlet 331, third mixed liquid outlet 333, fourth mixed liquid outlet 335, third mixed liquid inlet 337 and fourth mixed liquid inlet 339, third mixed liquid outlet 333 is connected to first mixed liquid inlet 113 through first mixed liquid valve 334, fourth mixed liquid outlet 335 is connected to second mixed liquid inlet 213 through second mixed liquid valve 336, third mixed liquid inlet 337 is connected to first mixed liquid outlet 143 through third mixed liquid valve 338, and fourth mixed liquid inlet 339 is connected to second mixed liquid outlet 243 through fourth mixed liquid valve 340.
In specific implementation, as shown in table 1, the aerobic granular sludge nutrient cultivation by adopting the system is circularly operated in eight working procedures.
TABLE 1
The system specifically works as follows:
Step one:
The first raw water inlet 111 is opened, the second raw water inlet 211 is closed, the third raw water inlet 331 is closed, the first supernatant water outlet 121 is closed, the second supernatant water outlet 221 is opened, the first aeration unit 13 is not operated, the second aeration unit 23 is not operated, the third aeration unit 31 is operated, the first mixed liquor valve 334 is closed, the second mixed liquor valve 336 is opened, the third mixed liquor valve 338 is opened, the fourth mixed liquor valve 340 is closed, the stirrer 32 is closed, the first sludge discharge port 141 is closed, and the second sludge discharge port 241 is closed.
Raw water enters the bottom of the first alternate tank 1 through the first water distribution unit 11 to contact with sludge, the sludge at the bottom of the first alternate tank 1 is in a high-load feast environment, and denitrification reaction and phosphorus accumulating bacteria phosphorus release phenomena occur in the process. The supernatant in the first alternating tank 1 enters the facultative tank 3 through the first mixed liquor outlet 143 and the third mixed liquor inlet 337, and the third aeration unit 31 makes the facultative tank 3 in an aeration state and causes COD oxidation, nitrification, and phosphorus absorption phenomena to occur. The mixed liquid in the facultative tank 3 enters the second alternate tank 2 through the fourth mixed liquid outlet 335 and the second mixed liquid inlet 213, and the mixed liquid is gravity precipitated in the second alternate tank 2 to realize mud-water separation. The supernatant in the second alternating tank 2 is discharged from the system through the second supernatant outlet 221 after being collected by the second supernatant collecting unit 22, and the sludge in the second alternating tank 2 is in a starved state, and in this embodiment, the duration of the process is 60min.
Step two:
The first raw water inlet 111 is opened, the second raw water inlet 211 is closed, the third raw water inlet 331 is closed, the first supernatant water outlet 121 is closed, the second supernatant water outlet 221 is opened, the first aeration unit 13 is operated, the second aeration unit 23 is not operated, the third aeration unit 31 is operated, the first mixed liquor valve 334 is closed, the second mixed liquor valve 336 is opened, the third mixed liquor valve 338 is opened, the fourth mixed liquor valve 340 is closed, the stirrer 32 is closed, the first sludge discharge port 141 is closed, and the second sludge discharge port 241 is closed.
The first alternate tank 1 starts aeration to generate COD oxidation, nitration reaction and phosphorus absorption, the muddy water mixed liquor in the first alternate tank 1 continuously enters the facultative tank 3 through the first mixed liquor outlet 143 and the third mixed liquor inlet 337 to supplement the sludge concentration in the facultative tank 3, the facultative tank 3 is in an aeration state to remove carbon, nitrogen and phosphorus, the mixed liquor in the facultative tank 3 enters the second alternate tank 2 through the fourth mixed liquor outlet 335 and the second mixed liquor inlet 213, the second alternate tank 2 continuously precipitates out water to finish muddy water separation, and in the embodiment of the step, the duration of the process is 60min.
Step three:
The first raw water inlet 111 is closed, the second raw water inlet 211 is closed, the third raw water inlet 331 is opened, the first supernatant water outlet 121 is closed, the second supernatant water outlet 221 is opened, the first aeration unit 13 is operated, the second aeration unit 23 is not operated, the third aeration unit 31 is not operated, the first mixed liquor valve 334 is closed, the second mixed liquor valve 336 is opened, the third mixed liquor valve 338 is closed, the fourth mixed liquor valve 340 is closed, the stirrer 32 is opened, the first sludge discharge port 141 is closed, and the second sludge discharge port 241 is closed.
The first alternate tank 1 stops water inflow and keeps an aeration state to finish degradation of residual pollutants, the facultative tank 3 starts water inflow and starts stirring at the same time to remove residual nitrate nitrogen through denitrification, and mixed liquid of the facultative tank 3 enters the second alternate tank 2 through the fourth mixed liquid outlet 335 and the second mixed liquid inlet 213 to finish mud-water separation in the second alternate tank 2. In this example, the duration of this process was 30min.
And step four:
The first raw water inlet 111 is closed, the second raw water inlet 211 is closed, the third raw water inlet 331 is opened, the first supernatant water outlet 121 is closed, the second supernatant water outlet 221 is opened, the first aeration unit 13 is not operated, the second aeration unit 23 is not operated, the third aeration unit 31 is operated, the first mixed liquor valve 334 is closed, the second mixed liquor valve 336 is opened, the third mixed liquor valve 338 is closed, the fourth mixed liquor valve 340 is closed, the stirrer 32 is closed, the first sludge discharge port 141 is opened, and the second sludge discharge port 241 is closed.
The first alternate tank 1 stops aeration, enters a precipitation stage, starts a first sludge discharge port 141 to discharge the residual sludge in the first alternate tank 1, stops stirring in the facultative tank 3, starts aeration, and enters a second alternate tank 2 to complete sludge-water separation. In this example, the duration of this process was 30min.
Step five:
the first raw water inlet 111 is closed, the second raw water inlet 211 is opened, the third raw water inlet 331 is closed, the first supernatant water outlet 121 is opened, the second supernatant water outlet 221 is closed, the first aeration unit 13 is not operated, the second aeration unit 23 is not operated, the third aeration unit 31 is operated, the first mixed liquor valve 334 is opened, the second mixed liquor valve 336 is closed, the third mixed liquor valve 338 is closed, the fourth mixed liquor valve 340 is opened, the stirrer 32 is closed, the first sludge discharge port 141 is closed, and the second sludge discharge port 241 is closed.
Raw water enters the bottom of the second alternate tank 2 through the second water distribution unit 21 to contact with sludge at the bottom, the sludge at the bottom is in a high-load feast environment, denitrification reaction and phosphorus accumulating bacteria phosphorus release phenomena occur in the process, supernatant at the top of the second alternate tank 2 enters the facultative tank 3 through the second mixed liquor outlet 243 and the fourth mixed liquor inlet 339 to contact with sludge in the facultative tank 3, the facultative tank 3 stops water inflow and keeps an aeration state to finish pollutant degradation, mixed liquor in the facultative tank 3 enters the first alternate tank 1 through the third mixed liquor outlet 333 and the first mixed liquor inlet 113, mixed liquor is precipitated in the first alternate tank 1 to realize mud-water separation, supernatant in the first alternate tank 1 is collected by the first supernatant collecting unit 12 and then discharged out of the system through the first supernatant water outlet 121, and sludge in the first alternate tank 1 is in a starved state. In this example, the duration of this process was 60 minutes.
Step six:
The first raw water inlet 111 is closed, the second raw water inlet 211 is opened, the third raw water inlet 331 is closed, the first supernatant water outlet 121 is opened, the second supernatant water outlet 221 is closed, the first aeration unit 13 is not operated, the second aeration unit 23 is operated, the third aeration unit 31 is operated, the first mixed liquor valve 334 is opened, the second mixed liquor valve 336 is closed, the third mixed liquor valve 338 is closed, the fourth mixed liquor valve 340 is opened, the stirrer 32 is closed, the first sludge discharge port 141 is closed, and the second sludge discharge port 241 is closed.
The second alternating tank 2 is opened for aeration, the muddy water mixed liquor in the second alternating tank 2 enters the facultative tank 3 through the second mixed liquor outlet 243 and the fourth mixed liquor inlet 339, the facultative tank 3 is in an aeration state, and the mixed liquor in the facultative tank 3 enters the first alternating tank 1 through the third mixed liquor outlet 333 and the first mixed liquor inlet 113 to complete muddy water separation. The duration of this step was 60min.
Step seven:
The first raw water inlet 111 is closed, the second raw water inlet 211 is closed, the third raw water inlet 331 is opened, the first supernatant water outlet 121 is opened, the second supernatant water outlet 221 is closed, the first aeration unit 13 is not operated, the second aeration unit 23 is operated, the third aeration unit 31 is not operated, the first mixed liquor valve 334 is opened, the second mixed liquor valve 336 is closed, the third mixed liquor valve 338 is closed, the fourth mixed liquor valve 340 is closed, the stirrer 32 is opened, the first sludge discharge port 141 is closed, and the second sludge discharge port 241 is closed.
The second alternate tank 2 stops water inflow and continues aeration to finish degradation of residual pollutants, the facultative tank 3 starts stirring while water inflow is started, residual nitrate nitrogen is removed by denitrification, and mixed liquid of the facultative tank 3 enters the first alternate tank 1 to finish mud-water separation, wherein the stage is 30min.
Step eight:
The first raw water inlet 111 is closed, the second raw water inlet 211 is closed, the third raw water inlet 331 is opened, the first supernatant water outlet 121 is opened, the second supernatant water outlet 221 is closed, the first aeration unit 13 is not operated, the second aeration unit 23 is not operated, the third aeration unit 31 is operated, the first mixed liquor valve 334 is opened, the second mixed liquor valve 336 is closed, the third mixed liquor valve 338 is closed, the fourth mixed liquor valve 340 is closed, the stirrer 32 is closed, the first sludge discharge port 141 is closed, and the second sludge discharge port 241 is opened.
The second alternate tank 2 stops aeration, enters a precipitation stage, starts a second sludge discharge port 241 to discharge excess sludge, and the facultative tank 3 stops stirring and enters an aeration state, and the muddy water mixed solution in the facultative tank 3 enters the first alternate tank 1 to complete muddy water separation. In this example, the duration of this process was 30min.
Specifically, the aerobic granular sludge culture can be continuously performed by repeating the above steps. The working procedures of the procedures five to eight and the working procedures of the procedures one to four are repeated, and only the water flow direction is switched from the first alternate pool 1, the facultative pool 3, the second alternate pool 2, the facultative pool 3 and the first alternate pool 1. The first water distribution pipe 114 and the second water distribution pipe 214 are used for distributing raw water to the bottoms of the first alternating pool 1 and the second alternating pool 2, so that the preferential contact of the inlet water and the sludge can be realized, and a high-load feast environment is created for the sludge at the bottom. The sludge in the first alternate tank 1 and the sludge in the second alternate tank 2 are alternately in a feast and a hunger state, and an alternate feast-hunger environment is formed in time and space, so that the EPS secretion is facilitated, and the formation of granular sludge is promoted. The first alternating tank 1 and the second alternating tank 2 are intermittently in anaerobic, aerobic and anoxic states, the facultative tank 3 is intermittently in aerobic and anoxic states, a sludge reflux and nitrifying liquid reflux system is not needed, so that pollutants such as carbon, nitrogen and phosphorus in sewage can be effectively removed, power equipment is reduced, energy consumption is reduced, sludge does not need to pass through a sludge pump and a reflux pump, and damage of the power equipment such as the reflux pump to a granular sludge structure is avoided. The first alternate tank 1 and the second alternate tank 2 alternately feed water, and the facultative tank 3 alternately aerates and stirs, so that anaerobic, aerobic and anoxic alternate operation is realized, and the denitrification and dephosphorization performance is improved. The first alternate tanks 1 and the second alternate tanks 2 are alternately used as sedimentation tanks and reaction tanks, and a secondary sedimentation tank is not required to be arranged independently, so that the utilization rate of the structure is improved.
In this embodiment, the first water distribution unit 11 and the second water distribution unit 21 are water distribution weirs.
Specifically, the water distribution weir is in the prior art, and the specific structure and the working principle are not described in detail.
Optionally, the first supernatant collecting unit 12 and the second supernatant collecting unit 22 are both air weirs;
The first supernatant collecting unit 12 is further provided with a first air inlet 144 and a first air outlet 146, the first air inlet 144 being provided with a first air inlet valve 145, the first air outlet 146 being provided with a first air outlet valve 147;
the second supernatant collecting unit 22 is provided with a second inlet 244 and a second outlet 246, the second inlet 244 is provided with a second inlet valve 245, and the second outlet 246 is provided with a second outlet valve 247.
Specifically, the air weir is the prior art, and including apron and play water weir, form airtight space between apron and the play water weir, change airtight space's atmospheric pressure through exhaust and inlet air, realize the water collection of air weir and break water collection.
In this embodiment, the alternating continuous flow aerobic granular sludge culture system further includes:
air compressor 5, air compressor 5 is connected with first air inlet valve 145 and second air inlet valve 245.
Specifically, the air pressure in the air weir is changed by the air compressor 5, and water collection and interruption of water collection of the air weir are realized.
Optionally, the first supernatant outlet 121 is provided with a first supernatant outlet valve 122;
the first mud discharging port 141 is provided with a first mud discharging valve 142;
The second supernatant outlet 221 is provided with a second supernatant outlet valve 222;
the second sludge discharge port 241 is provided with a second sludge discharge valve 242.
Specifically, the first supernatant water outlet valve 122 can open and close the first supernatant water outlet 121, the first sludge discharge valve 142 can open and close the first sludge discharge port 141, the second sludge discharge valve 242 can open and close the second sludge discharge port 241, and the second supernatant water outlet valve 222 can open and close the second supernatant water outlet 221.
In this embodiment, the alternating continuous flow aerobic granular sludge culture system further includes:
The raw water tank 4, the raw water tank 4 is internally provided with a water pump 41, the water pump 41 is connected with a first raw water inlet 111, a second raw water inlet 211 and a third raw water inlet 331 through a water supply pipeline 42, the first raw water inlet 111 is provided with a first raw water inlet valve 112, the second raw water inlet 211 is provided with a second raw water inlet valve 212, and the third raw water inlet 331 is provided with a third raw water inlet valve 332.
Specifically, the raw water tank 4 is configured to store raw water, the water pump 41 is configured to feed raw water to the first alternate tank 1, the second alternate tank 2, and the facultative tank 3, the first raw water inlet valve 112 is configured to open and close the first raw water inlet 111, the second raw water inlet valve 212 is configured to open and close the second raw water inlet 211, and the third raw water inlet valve 332 is configured to open and close the third raw water inlet 331.
In this embodiment, the first aeration unit 13, the second aeration unit 23 and the third aeration unit 31 are aeration discs, the first aeration unit 13 is provided with a first aeration inlet 131, the second aeration unit 23 is provided with a second aeration inlet 231, and the third aeration unit 31 is provided with a third aeration inlet 311.
The first aeration unit 13 is arranged at the bottom of the first alternating pond 1;
The second aeration unit 23 is arranged at the bottom of the second alternating tank 2;
The third aeration unit 31 is provided at the bottom of the facultative tank 3.
Specifically, the aeration disc is in the prior art and is arranged at the bottom of the container and used for dispersing air into water to provide sufficient oxygen for degrading pollutants by microorganisms.
Optionally, the alternating continuous flow aerobic granular sludge culture system further comprises:
the blower 6, the blower 6 is connected with the first aeration inlet 131, the second aeration inlet 231 and the third aeration inlet 311, the first aeration inlet 131 is provided with the first aeration valve 132, the second aeration inlet 231 is provided with the second aeration valve 232, and the third aeration inlet 311 is provided with the third aeration valve 322.
Optionally, the alternating continuous flow aerobic granular sludge culture system further comprises a control unit 7, wherein the control unit 7 is electrically connected with the first mixed liquor valve 334, the second mixed liquor valve 336, the third mixed liquor valve 338, the fourth mixed liquor valve 340, the first air inlet valve 145, the first air outlet valve 147, the second air inlet valve 245, the second air outlet valve 247, the air compressor 5, the first supernatant water outlet valve 122, the first mud valve 142, the second supernatant water outlet valve 222, the second mud valve 242, the water pump 41, the first raw water inlet valve 112, the second raw water inlet valve 212, the third raw water inlet valve 332, the blower 6, the first aeration valve 132, the second aeration valve 232, the third aeration valve 322 and the agitator 32.
As shown in fig. 2, the embodiment also provides an alternative continuous flow aerobic granular sludge culture method, which uses the alternative continuous flow aerobic granular sludge culture system in the embodiment, and includes the following steps:
step 1, introducing sewage into the first alternate tank 1 and distributing the sewage to the bottom to contact with sludge, introducing the sewage at the top of the first alternate tank 1 into the facultative tank 3 for denitrification and dephosphorization, introducing the mixed solution of the facultative tank 3 into the second alternate tank 2 for precipitation, discharging the supernatant of the second alternate tank 2 from the system, and continuously operating for 60min;
Step 2, aerating the first alternative tank 1, introducing the muddy water mixed solution into the facultative tank 3 for degrading pollutants, introducing the mixed solution in the facultative tank 3 into the second alternative tank 2 for precipitating, and continuously operating for 60min;
Step 3, stopping water inflow of the first alternative tank 1 and continuing aeration to finish degradation of residual pollutants, introducing sewage into the facultative tank 3, stirring, removing residual nitrate nitrogen by denitrification, introducing mixed solution in the facultative tank 3 into the second alternative tank 2 for precipitation, and continuously operating for 30min;
step 4, stopping aeration of the first alternative tank 1 to perform precipitation and discharging residual sludge after precipitation, stopping stirring and performing aeration of the facultative tank 3, introducing muddy water mixed solution in the facultative tank 3 into the second alternative tank 2 to perform precipitation, and continuously operating for 30min;
Step 5, introducing sewage into the second alternating pond 2 and distributing the sewage to the bottom to contact with sludge, stopping water inflow of the facultative tank 3 and continuing aeration to finish pollutant degradation, introducing mixed liquor of the facultative tank 3 into the first alternating pond 1 and precipitating, discharging supernatant of the first alternating pond 1 from a system, and continuously operating for 30min;
Step 6, aerating the second alternative tank 2 and introducing the muddy water mixed solution into the facultative tank 3, introducing the mixed solution of the facultative tank 3 into the first alternative tank 1 for precipitation, and continuously operating for 60min;
step 7, stopping water inflow of the second alternative tank 2 and continuing aeration to finish degradation of residual pollutants, introducing sewage into the facultative tank 3, stirring, removing residual nitrate nitrogen by denitrification, introducing mixed solution in the facultative tank 3 into the first alternative tank 1 for precipitation, and continuously operating for 60min;
Step 8, stopping aeration of the second alternative tank 2 to precipitate and discharging the residual sludge after precipitation, stopping stirring and starting aeration of the facultative tank 3, introducing the muddy water mixed solution in the facultative tank 3 into the first alternative tank 1 to precipitate, and continuously operating for 30min;
And 9, circularly repeating the steps 1 to 8.
Further, the embodiment adopts the alternating continuous flow aerobic granular sludge culture method to treat the raw water of the primary sedimentation tank of a certain water plant, the water quality indexes of the raw water COD, ammonia nitrogen, TN and TP are respectively 150-400 mg/L, 25-40 mg/L, 30-50 mg/L and 3-5 mg/L, and the sludge granulation is realized by inoculating activated sludge in an alternating operation mode for 60 days, so that the sludge particle size reaches 208.5 mu m. The sludge particle size distribution of the biological pond in stable operation is shown in figure 3, and the concentration of COD, ammonia nitrogen, TN and TP of the effluent is respectively 18-30 mg/L, 0.3-1 mg/L, 12-18 mg/L and 0.1-0.5 mg/L.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
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| CN111170461A (en) * | 2020-03-16 | 2020-05-19 | 南京大学 | A kind of alternate starvation aerobic anaerobic sludge lateral flow in-situ reduction and strengthening process |
| CN115286104A (en) * | 2022-07-05 | 2022-11-04 | 王凯军 | A continuous flow aerobic granular sludge system and process for strengthening nitrogen and phosphorus removal |
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| EP4086231A1 (en) * | 2021-05-03 | 2022-11-09 | John Cockerill S.A. | Wastewater treatment by continuous stream aerobic granular biomass |
| CN113371821A (en) * | 2021-07-22 | 2021-09-10 | 许孝瑜 | Continuous flow aerobic granular sludge reaction system and treatment method |
| CN115974263A (en) * | 2022-10-28 | 2023-04-18 | 广东石油化工学院 | An intermittent aeration continuous flow aerobic granular sludge reactor and its operation method |
| CN118239599B (en) * | 2024-03-15 | 2025-11-21 | 广东粤海水务股份有限公司 | Partition integrated aerobic granular sludge-membrane bioreactor coupling device and application |
| CN118515359B (en) * | 2024-06-26 | 2025-07-29 | 长江生态环保集团有限公司 | Combined reaction device for culturing aerobic granular sludge and operation method thereof |
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| CN115286104A (en) * | 2022-07-05 | 2022-11-04 | 王凯军 | A continuous flow aerobic granular sludge system and process for strengthening nitrogen and phosphorus removal |
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