A continuous flow reaction device and operation method for promoting rapid formation of granular sludge

Abstract

The present invention provides a continuous flow reaction device and operation method for promoting the rapid formation of granular sludge, comprising a reactor body, the reactor body is connected to a water inlet system for water inlet; the reactor body is also connected to an aeration system; a sedimentation and sludge discharge system is arranged inside the reactor body; an air lift reflux system is arranged inside the reactor body; and a water outlet system is connected to the reactor body. This device can rapidly culture activated sludge into granular sludge in situ, taking into account the continuous flow and uninterrupted operation characteristics, the device has a high degree of automation, can screen sludge and flocs of different particle sizes, and is not easy to destroy the particle structure when refluxing the sludge, thereby reducing the concentration of suspended solids in the effluent.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a continuous flow reaction device and an operation method for promoting rapid formation of granular sludge. Background Art

[0002] Aerobic granular sludge (AGS) has the advantages of high sludge concentration, fast settling rate and less residual sludge while effectively removing pollutants from water. Therefore, this technology is regarded as one of the options for improving sewage treatment efficiency, which has triggered decades of research. Although AGS technology has many advantages over traditional activated sludge method, AGS technology has shortcomings such as long start-up time, poor long-term operation stability and difficulty in achieving continuous flow operation, which makes its large-scale application cases few, and in most cases it is limited to sequencing batch reactors (SBR). In China, related research has only been carried out in a few laboratories, and long-term operation is very unstable, and it is difficult to combine the AGS process with actual engineering. Therefore, designing a technical method for rapid cultivation of granular sludge under continuous flow conditions is of great significance for the upgrading and transformation of existing sewage treatment plants, and will have potential application and promotion value. Summary of the invention

[0003] In order to solve the current technical problems, the main purpose of the present invention is to provide a continuous flow reaction device and an operation method that promote the rapid formation of granular sludge. This device can quickly cultivate activated sludge into granular sludge in situ, taking into account the continuous flow and uninterrupted operation characteristics. The device has a high degree of automation and can screen sludge and flocs of different particle sizes. It is not easy to destroy the particle structure when returning the sludge, thereby reducing the concentration of suspended solids in the effluent.

[0004] In order to realize the above-mentioned technical features, the purpose of the present invention is achieved as follows: A continuous flow reaction device that promotes the rapid formation of granular sludge includes a reactor body, and the reactor body is connected to a water inlet system for water intake; the reactor body is also connected to an aeration system; a sedimentation and sludge discharge system is arranged inside the reactor body; an air lift reflux system is arranged inside the reactor body; and a water outlet system is connected to the reactor body.

[0005] The reactor body comprises a first sequencing batch reactor, which is connected to a second sequencing batch reactor, and both the first sequencing batch reactor and the second sequencing batch reactor are connected to a fully mixed anaerobic reactor at the same time, the fully mixed anaerobic reactor is connected to a sedimentation tank, and the sedimentation tank is connected to a water outlet tank.

[0006] The first sequencing batch reactor is connected to the second sequencing batch reactor through a first electric gate; the first sequencing batch reactor is connected to the fully mixed anaerobic reactor through a second electric gate; the second sequencing batch reactor is connected to the fully mixed anaerobic reactor through a third electric gate; the fully mixed anaerobic reactor is connected to the sedimentation tank through a first gate, and the sedimentation tank and the effluent tank are connected through a second gate.

[0007] The water inlet system comprises a raw water barrel, which is connected to the first sequencing batch reactor via a first metering pump and a first water inlet pipe, and is connected to the second sequencing batch reactor via a second metering pump and a second water inlet pipe.

[0008] The aeration system comprises an SBR aeration pump and a CSTR aeration pump. The SBR aeration pump is connected to the aeration disk inside the first sequencing batch reactor and the second sequencing batch reactor through an aeration pipe, and the CSTR aeration pump is connected to the aeration disk inside the fully mixed anaerobic reactor through an aeration pipe.

[0009] A first mixer is installed in the first sequencing batch reactor and the second sequencing batch reactor, and a second mixer is installed in the fully mixed anaerobic reactor.

[0010] The sedimentation and sludge discharge system includes a baffle with an adjustable inclination angle arranged inside the sedimentation tank. The baffle is connected to the bottom of the sedimentation tank by a hinge. The inclination angle is adjusted from 60° to 120° by a screw arranged on one side. Heavy particles cannot cross the baffle and fall into a square sludge hopper with an inclination angle of 60°. Light particles and flocs are discharged from the reaction device through the sludge discharge pipe.

[0011] The air lift reflux system includes an air lift pump, which connects the sedimentation tank and the first sequencing batch reactor through a first air lift reflux pipe, and connects the sedimentation tank and the second sequencing batch reactor through a second air lift reflux pipe, thereby air lifts and refluxes the granular sludge in the sedimentation tank to the first sequencing batch reactor and the second sequencing batch reactor.

[0012] The water outlet system includes a perforated water collecting pipe arranged at a certain height from the bottom of the water outlet pool. The perforated water collecting pipe collects overflow water and discharges it out of the reactor through the water outlet pipe. The other end of the water outlet pipe is connected to the water outlet collection bucket.

[0013] It also includes a PLC control system, which is connected to the reactor body, the water inlet system, the aeration system and the gas lift reflux system. The duration of each operating period is adjustable in the automatic mode, and the reaction device can be shut down for maintenance in the manual mode.

[0014] Through the first sequencing batch reactor, the second sequencing batch reactor and the fully mixed anaerobic reactor, nutrient conditions with alternating feast and starvation periods in time and space are formed to meet the operation requirements under continuous flow conditions.

[0015] The first sequencing batch reactor and the second sequencing batch reactor are operated symmetrically, water is distributed to the sludge layer of the first sequencing batch reactor or the second sequencing batch reactor at multiple points in the form of upflow, the agitator and the aeration pump are kept closed, and a substrate concentration gradient is formed along the height direction to promote the formation of anaerobic core of granular sludge;

[0016] The fully mixed anaerobic reactor degrades pollutants through continuous aeration and stirring to promote the growth of sludge particles.

[0017] An operating method for a continuous flow reaction device that promotes rapid formation of granular sludge, the operating method includes five stages: SBR anaerobic water inlet, SBR aerobic aeration, SBR aerobic reflux, CSTR aeration stirring, and sedimentation separation, with a total operating cycle of T, and the duration of each operating stage is adjustable;

[0018] The anaerobic inflow of the first sequencing batch reactor was regarded as the feast period, and the duration was set to T1; the aerobic reflow of the second sequencing batch reactor, the aerobic aeration of the second sequencing batch reactor and the aeration stirring of the fully mixed anaerobic reactor were regarded as the starvation period, and the durations were set to T2, T3 and T4 respectively, with a total duration of T5; the time required for the sludge not to be discharged from the reaction device was taken as the starting sedimentation time, and the sludge sedimentation time was gradually shortened from 20 min according to the changes in the sludge settling performance and sludge concentration.

[0019] A method for operating a continuous flow reaction device that promotes rapid formation of granular sludge, the method for operating the device being used to purify eutrophic water bodies that filter and remove algae, specifically comprising the following steps:

[0020] S1, sewage enters the first sequencing batch reactor from the bottom through the first water inlet pipe for anaerobic water inflow, at which time the first air stripping reflux pipe, the mixer and aeration pump of the first sequencing batch reactor are closed;

[0021] S2, the sewage enters the second sequencing batch reactor through the first electric gate for aerobic aeration, at which time the second gas lift reflux pipe is closed, and the mixer and aeration pump of the second sequencing batch reactor are turned on;

[0022] S3, the sewage is aerobically refluxed in the second sequencing batch reactor, at which time the second air stripping reflux pipe, the stirrer of the second sequencing batch reactor and the aeration pump of the second sequencing batch reactor are turned on;

[0023] S4, sewage enters the fully mixed anaerobic reactor through the third electric gate for aerobic mixing, at which time the mixer and aeration pump of the fully mixed anaerobic reactor remain open;

[0024] S5, sewage enters the sedimentation tank through the first gate for sedimentation and separation. At this time, the inclination angle of the baffle is adjusted within the range of 60° to 120° according to the screening requirements of the sludge particle size;

[0025] S5-1, heavy particles remain in the sludge hopper in the left area of ​​the baffle, and are lifted and refluxed to the second sequencing batch reactor through the second air lift reflux pipe;

[0026] S5-2, light particles and flocs cross the baffle and enter the right area, and are discharged from the reaction device through the mud discharge pipe at the bottom of the sedimentation tank;

[0027] S5-3, sewage passes over the baffle and enters the outlet tank through the second gate;

[0028] S6, when the water level in the outlet pool exceeds the set value, the outlet water is collected through the perforated water collecting pipe and then flows out of the reaction device.

[0029] The operating method is used to purify eutrophic water bodies by filtering and removing algae, and specifically comprises the following steps:

[0030] S1, sewage enters the second sequencing batch reactor from the bottom through the second water inlet pipe for anaerobic water inflow, at which time the second air stripping reflux pipe, the mixer and aeration pump of the second sequencing batch reactor are closed;

[0031] S2, the sewage enters the first sequencing batch reactor through the first electric gate for aerobic aeration, at which time the first gas lift reflux pipe is closed, and the mixer and aeration pump of the first sequencing batch reactor are turned on;

[0032] S3, the sewage is aerobically refluxed in the first sequencing batch reactor, at which time the first air stripping reflux pipe, the mixer of the first sequencing batch reactor and the aeration pump of the second sequencing batch reactor are turned on;

[0033] S4, sewage enters the fully mixed anaerobic reactor through the second electric gate for aerobic stirring, at which time the mixer and aeration pump of the fully mixed anaerobic reactor remain open;

[0034] S5, sewage enters the sedimentation tank through the first gate for sedimentation and separation. At this time, the inclination angle of the baffle is adjusted within the range of 60° to 120° according to the screening requirements of the sludge particle size;

[0035] S5-1, heavy particles remain in the sludge hopper in the left area of ​​the baffle, and are lifted and refluxed to the first sequencing batch reactor through the first air lift reflux pipe;

[0036] S5-2, light particles and flocs cross the baffle and enter the right area, and are discharged from the reaction device through the mud discharge pipe at the bottom of the sedimentation tank;

[0037] S5-3, sewage passes over the baffle and enters the outlet tank through the second gate;

[0038] S6, when the water level in the outlet pool exceeds the set value, the outlet water is collected through the perforated water collecting pipe and then flows out of the reaction device.

[0039] The value of T is 240 min, the value of T1 is 60 min, the value of T2 is 40 min, the value of T3 is 20 min, the value of T4 is 110 min, and the value of T5 is 170 min.

[0040] The present invention has the following beneficial effects:

[0041] 1. The device of the present invention combines the advantages of SBR and CSTR in structure, and can quickly cultivate activated sludge into granular sludge in situ, taking into account the uninterrupted operation characteristics of continuous flow, and can meet the requirements of continuous flow operation; the device has a high degree of automation and can screen sludge and flocs of different particle sizes. When the sludge is returned, it is not easy to destroy the particle structure, thereby reducing the concentration of suspended solids in the effluent.

[0042] 2. The invention symmetrically sets two SBRs for alternating water inlet, and the water flows upward from the bottom of the SBR, forming a matrix concentration gradient along the height direction, forming an alternation of feast period and starvation period in time and space, and meeting the nutritional conditions required for rapid granulation of granular sludge.

[0043] 3. This method uses air lift to return the sludge to avoid destroying the stability of the particle structure.

[0044] 4. The present invention arranges a baffle with an adjustable inclination angle inside the sedimentation tank to screen particles with different settling velocities, washes light particles and flocs out of the reactor, and then utilizes the liquid density difference formed inside and outside the air lift reflux pipe to air lift the granular sludge in the sludge hopper back to the SBR.

[0045] 5. The present invention arranges a perforated water collecting pipe in the outlet pool to collect the overflow water and discharge it out of the reactor, thereby reducing the concentration of suspended solids in the outlet water and improving the water quality of the outlet water. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] Figure 1 It is a cross-sectional view of the present invention.

[0048] Figure 2 This is a plan view of the present invention.

[0049] Figure 3 It is a top view of the reaction device of the present invention.

[0050] Figure 4 For the present invention Figure 3 Medium AA view.

[0051] Figure 5 For the present invention Figure 3 Medium BB view.

[0052] Figure 6 For the present invention Figure 3 Medium CC view.

[0053] Figure 7 For the present invention Figure 3 Middle EE view.

[0054] In the figure: a first sequencing batch reactor 1, a second sequencing batch reactor 2, a fully mixed anaerobic reactor 3, a sedimentation tank 4, a water outlet tank 5, a raw water barrel 6, a first metering pump 7, a second metering pump 8, an SBR aeration pump 9, a CSTR aeration pump 10, a first mixer 11, a second mixer 12, an air lift pump 13, and a water outlet collection barrel 14;

[0055] The first water inlet pipe a, the second water inlet pipe b, the first electric gate c, the second electric gate d, the third electric gate e, the first gate f, the second gate g, the perforated water collecting pipe h, the first gas lift return pipe i, the second gas lift return pipe j, and the mud discharge pipe k. DETAILED DESCRIPTION

[0056] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0057] Embodiment 1:

[0058] See also Figure 1-7 A continuous flow reaction device for promoting the rapid formation of granular sludge includes a reactor body, the reactor body is connected to a water inlet system for water inlet; the reactor body is also connected to an aeration system; a sedimentation and sludge discharge system is arranged inside the reactor body; an air stripping reflux system is arranged inside the reactor body; and a water outlet system is connected to the reactor body. This device can rapidly culture activated sludge into granular sludge in situ, taking into account the characteristics of continuous flow and uninterrupted operation. The device has a high degree of automation and can screen sludge and flocs of different particle sizes. It is not easy to destroy the particle structure when refluxing the sludge, and reduce the concentration of suspended solids in the effluent.

[0059] Furthermore, the reactor body includes a first sequencing batch reactor 1, the first sequencing batch reactor 1 is connected to the second sequencing batch reactor 2, the first sequencing batch reactor 1 and the second sequencing batch reactor 2 are both connected to a fully mixed anaerobic reactor 3 at the same time, the fully mixed anaerobic reactor 3 is connected to a sedimentation tank 4, and the sedimentation tank 4 is connected to an outlet tank 5. By adopting the above-mentioned continuous flow reaction device, the two first sequencing batch reactors 1 and the second sequencing batch reactor 2 are operated symmetrically, and the substrate concentration gradient formed by the upward flow is utilized to promote the formation of anaerobic cores of granular sludge. CSTR degrades pollutants through continuous aeration and stirring, and promotes the growth of sludge particles. The adjustable baffle in the sedimentation tank can screen particles and flocs of different particle sizes. The heavy particles gather in the sludge hopper and then flow back in the air lift mode. The sludge discharge pipe discharges the light particles and flocs out of the reactor; the outlet tank adopts the outflow mode of the perforated water collecting pipe to reduce the probability of suspended solids leaving the reactor with the effluent.

[0060] The first sequencing batch reactor 1 and the second sequencing batch reactor 2 both use SBR reactors. The fully mixed anaerobic reactor 3 uses a CSTR reactor. SBR is the abbreviation of sequencing batch activated sludge process, which is an activated sludge sewage treatment technology operated in an intermittent aeration mode. CSTR is an anaerobic treatment technology that keeps the fermentation raw materials and microorganisms in a completely mixed state.

[0061] Furthermore, the first sequencing batch reactor 1 is connected to the second sequencing batch reactor 2 through the first electric gate c; the first sequencing batch reactor 1 is connected to the fully mixed anaerobic reactor 3 through the second electric gate d; the second sequencing batch reactor 2 is connected to the fully mixed anaerobic reactor 3 through the third electric gate e; the fully mixed anaerobic reactor 3 is connected to the sedimentation tank 4 through the first gate f, and the sedimentation tank 4 and the effluent tank 5 are connected through the second gate g. Through the above, the system connection control structure can realize the connection control between the first sequencing batch reactor 1, the second sequencing batch reactor 2, the fully mixed anaerobic reactor 3, the sedimentation tank 4 and the effluent tank 5 to achieve sewage treatment.

[0062] Furthermore, the water inlet system includes a raw water barrel 6, which is connected to the first sequencing batch reactor 1 through a first metering pump 7 and a first water inlet pipe a, and is connected to the second sequencing batch reactor 2 through a second metering pump 8 and a second water inlet pipe b. The water inlet system can accurately control the sewage inlet process during the sewage treatment process.

[0063] Further, the aeration system includes an SBR aeration pump 9 and a CSTR aeration pump 10, wherein the SBR aeration pump 9 is connected to the aeration plates inside the first sequencing batch reactor 1 and the second sequencing batch reactor 2 through an aeration pipe, and the CSTR aeration pump 10 is connected to the aeration plates inside the fully mixed anaerobic reactor 3 through an aeration pipe. The aeration system described above can be used to aerate the first sequencing batch reactor 1, the second sequencing batch reactor 2 and the fully mixed anaerobic reactor 3 when aeration is required.

[0064] Furthermore, the first sequencing batch reactor 1 and the second sequencing batch reactor 2 are equipped with a first stirrer 11, and the fully mixed anaerobic reactor 3 is equipped with a second stirrer 12. The stirrers can be used to stir the first sequencing batch reactor 1, the second sequencing batch reactor 2 and the fully mixed anaerobic reactor 3 during the treatment process.

[0065] Furthermore, the sedimentation and sludge discharge system includes a baffle I with an adjustable inclination angle arranged inside the sedimentation tank 4. The baffle I is hingedly connected to the bottom of the sedimentation tank 4. The inclination angle is adjusted from 60° to 120° by a screw arranged on one side. Heavy particles cannot pass through the baffle I and fall into a square sludge hopper with an inclination angle of 60°. Light particles and flocs are discharged from the reaction device via a sludge discharge pipe k. The above-mentioned sedimentation and sludge discharge system can separate granular sludge and flocs of different particle sizes by utilizing the difference in sedimentation velocity. Heavy particles cannot pass through the baffle I and gather in the sludge hopper. Light particles and flocs pass through the baffle I and are discharged from the reaction device via a sludge discharge pipe.

[0066] Furthermore, the air lift reflux system includes an air lift pump 13, which connects the sedimentation tank 4 and the first sequencing batch reactor 1 through the first air lift reflux pipe i, and connects the sedimentation tank 4 and the second sequencing batch reactor 2 through the second air lift reflux pipe j, thereby air lifts and refluxes the granular sludge in the sedimentation tank 4 to the first sequencing batch reactor 1 and the second sequencing batch reactor 2. In the specific working process, the air lift pump 13 presses compressed air into the air lift reflux pipe through a hose, forms a liquid density difference inside and outside the air lift reflux pipe, and uses the first air lift reflux pipe i or the second air lift reflux pipe j to alternately reflux the sludge, and air lifts and refluxes the heavy particles in the sludge hopper to the first sequencing batch reactor 1 or the second sequencing batch reactor 2, so as to avoid damaging the structure of the granular sludge.

[0067] Furthermore, the effluent system includes a perforated water collecting pipe h arranged at a certain height from the bottom of the effluent pool 5, the perforated water collecting pipe h collects the overflow effluent and discharges it from the reactor through the effluent pipe, and the other end of the effluent pipe is connected to the effluent collection bucket 14. By adopting the effluent mode of the perforated water collecting pipe h, the concentration of suspended solids in the effluent is reduced.

[0068] Furthermore, it also includes a PLC control system, which is connected to the reactor body, the water inlet system, the aeration system and the gas stripping reflux system. The duration of each operating period is adjustable in the automatic mode, and the reaction device can be shut down for maintenance in the manual mode. By adopting the PLC control system, the automatic operation control of the reaction device can be realized, and its automatic operation degree is improved.

[0069] Furthermore, the first sequencing batch reactor 1, the second sequencing batch reactor 2 and the fully mixed anaerobic reactor 3 form nutritional conditions in which feast periods and starvation periods alternate in time and space to meet the requirements for operation under continuous flow conditions.

[0070] Furthermore, the first sequencing batch reactor 1 and the second sequencing batch reactor 2 operate symmetrically to distribute water to the sludge layer of the first sequencing batch reactor 1 or the second sequencing batch reactor 2 at multiple points in the form of upflow, and the mixer and the aeration pump remain closed to form a substrate concentration gradient along the height direction to promote the formation of anaerobic core of granular sludge; the fully mixed anaerobic reactor 3 degrades pollutants through continuous aeration and stirring to promote the growth of sludge particles.

[0071] Embodiment 2:

[0072] In this embodiment, preferably, the reaction device has an external dimension of 1150 mm×620 mm×900 mm, a total volume of 641.7 L, a working water depth of 700 mm, and an effective volume of 499.1 L.

[0073] Preferably, a PLC control box is used to build an automatic control system. In the automatic mode, the duration of each operating period can be adjusted, and in the manual mode, the reactor can be shut down for maintenance.

[0074] Preferably, the two SBRs are operated symmetrically, the specifications of the two water inlet metering pumps are 50 L / h, the anaerobic water inlet is 60 min, the aerobic exposure is 40 min, the aerobic reflux is 20 min, the diameter of the water inlet main pipe is 20 mm, and the diameter of the water inlet branch pipe is 8 mm.

[0075] Preferably, each SBR is provided with one mixer, the rotation speed is set to 50 rpm, each SBR is provided with two aeration plates with a diameter of 100 mm, and two SBRs share one 50 L / min aeration pump.

[0076] Preferably, the CSTR is equipped with three agitators, the rotation speed is set to 50 rpm, one aeration pump of 50 L / min, and four aeration disks with a diameter of 100 mm.

[0077] Preferably, a baffle with an adjustable inclination angle is set in the sedimentation tank, with dimensions of 800 mm×600 mm×20 mm, connected to the bottom of the tank by a hinge, and its inclination angle is adjusted from 60° to 120° by a screw set on one side. Heavy particles cannot cross the baffle and fall into a square sludge hopper with an inclination angle of 60°, and light particles and flocs are discharged from the reactor through a sludge discharge pipe k with a diameter of 32 mm.

[0078] Preferably, two air lift reflux pipes with a diameter of 40 mm are set in the sedimentation tank. They are "L"-shaped, with a horizontal length of 420 mm and a vertical length of 620 mm. A 100 L / min air lift pump is set to air lift the granular sludge in the sludge hopper and return it to SBR1 or SBR2.

[0079] Preferably, in order to reduce the concentration of suspended solids in the effluent, a perforated water collecting pipe with a length of 400 mm, a pipe diameter of 32 mm, a hole diameter of 6 mm, and a hole spacing of 60 mm is set at a height of 600 mm from the bottom of the effluent pool to collect the overflow water and discharge it from the reactor through an outlet pipe with a pipe diameter of 32 mm.

[0080] Embodiment 3:

[0081] An operating method for a continuous flow reaction device that promotes rapid formation of granular sludge, the operating method includes five stages: SBR anaerobic water inlet, SBR aerobic aeration, SBR aerobic reflux, CSTR aeration stirring, and sedimentation separation, with a total operating cycle of T, and the duration of each operating stage is adjustable;

[0082] The anaerobic inflow of the first sequencing batch reactor 1 was regarded as the feast period, and the duration was set to T1; the aerobic reflow of the second sequencing batch reactor 2, the aerobic aeration of the second sequencing batch reactor 2 and the aeration stirring of the fully mixed anaerobic reactor 3 were regarded as the starvation period, and the durations were set to T2, T3 and T4 respectively, with a total duration of T5; the time required for the sludge not to be discharged from the reaction device was taken as the starting sedimentation time, and the sludge sedimentation time was gradually shortened from 20 min according to the changes in the sludge settling performance and sludge concentration.

[0083] A method for operating a continuous flow reaction device that promotes rapid formation of granular sludge, the method for operating the device being used to purify eutrophic water bodies that filter and remove algae, specifically comprising the following steps:

[0084] S1, sewage enters the first sequencing batch reactor 1 from the bottom through the first water inlet pipe a for anaerobic water inflow, at which time the first air stripping reflux pipe i, the mixer and aeration pump of the first sequencing batch reactor 1 are closed;

[0085] S2, the sewage enters the second sequencing batch reactor 2 through the first electric gate c for aerobic aeration, at which time the second gas lift reflux pipe j is closed, and the mixer and aeration pump of the second sequencing batch reactor 2 are turned on;

[0086] S3, the sewage is aerobically refluxed in the second sequencing batch reactor 2, at which time the second air stripping reflux pipe j, the stirrer of the second sequencing batch reactor 2 and the aeration pump of the second sequencing batch reactor 2 are turned on;

[0087] S4, the sewage enters the fully mixed anaerobic reactor 3 through the third electric gate e for aerobic stirring, at which time the mixer and aeration pump of the fully mixed anaerobic reactor 3 remain open;

[0088] S5, the sewage enters the sedimentation tank 4 through the first gate f for sedimentation and separation. At this time, the inclination angle of the baffle I is adjusted within the range of 60° to 120° according to the screening requirements of the sludge particle size;

[0089] S5-1, heavy particles remain in the sludge hopper in the left area of ​​the baffle I, and are air-lifted and refluxed to the second sequencing batch reactor 2 through the second air lift reflux pipe j;

[0090] S5-2, light particles and flocs cross the baffle I and enter the right area, and are discharged from the reaction device through the mud discharge pipe k at the bottom of the sedimentation tank 4;

[0091] S5-3, sewage passes over baffle I and enters outlet tank 5 through the second gate g;

[0092] S6, after the water level in the outlet pool 5 exceeds the set value, the outlet water is collected through the perforated water collecting pipe h and then flows out of the reaction device.

[0093] Embodiment 4:

[0094] In this embodiment, another method for purifying eutrophic water by filtering and removing algae is provided, which specifically includes the following steps:

[0095] S1, sewage enters the second sequencing batch reactor 2 from the bottom through the second water inlet pipe b for anaerobic water inflow, at which time the second air stripping reflux pipe j, the mixer and aeration pump of the second sequencing batch reactor 2 are closed;

[0096] S2, the sewage enters the first sequencing batch reactor 1 through the first electric gate c for aerobic aeration, at which time the first gas lift reflux pipe i is closed, and the mixer and aeration pump of the first sequencing batch reactor 1 are turned on;

[0097] S3, the sewage is aerobically refluxed in the first sequencing batch reactor 1, at which time the first air stripping reflux pipe i, the mixer of the first sequencing batch reactor 1 and the aeration pump of the second sequencing batch reactor 2 are turned on;

[0098] S4, the sewage enters the fully mixed anaerobic reactor 3 through the second electric gate d for aerobic stirring, and the mixer and aeration pump of the fully mixed anaerobic reactor 3 are kept open;

[0099] S5, the sewage enters the sedimentation tank 4 through the first gate f for sedimentation and separation. At this time, the inclination angle of the baffle I is adjusted within the range of 60° to 120° according to the screening requirements of the sludge particle size;

[0100] S5-1, heavy particles remain in the sludge hopper in the left area of ​​the baffle I, and are air-lifted and refluxed to the first sequencing batch reactor 1 through the first air lift reflux pipe i;

[0101] S5-2, light particles and flocs cross the baffle I and enter the right area, and are discharged from the reaction device through the mud discharge pipe k at the bottom of the sedimentation tank 4;

[0102] S5-3, sewage passes over baffle I and enters outlet tank 5 through the second gate g;

[0103] S6, after the water level in the outlet pool 5 exceeds the set value, the outlet water is collected through the perforated water collecting pipe h and then flows out of the reaction device.

[0104] Embodiment 5:

[0105] In this embodiment, a table 1 of the operation phases of the reactor is provided, see Table 1:

[0106] Table 1 is a table of the operation stages of the reactor provided by the present invention.

[0107]

[0108] This embodiment is set to process a scale of 1 m 3 / d pilot reactor, the operating treatment results are shown in Table 2 below.

[0109] Table 2 Operation and processing results

[0110]

[0111] In actual implementation, it can be found that this design can remove some pollutants in sewage, with a COD removal rate of 87.28%, an NH3-N removal rate of 88.80%, a TN removal rate of 64.31%, and a TP removal rate of 63.82%.

Claims

1. A continuous flow reaction device for promoting rapid formation of granular sludge, characterized in that: The reactor body comprises a reactor main body, the reactor main body is connected to a water inlet system for water inlet; the reactor main body is also connected to an aeration system; a sedimentation and mud discharge system is arranged inside the reactor main body; an air stripping reflux system is arranged inside the reactor main body; and a water outlet system is connected to the reactor main body; The reactor body comprises a first sequencing batch reactor (1), the first sequencing batch reactor (1) is connected to the second sequencing batch reactor (2), the first sequencing batch reactor (1) and the second sequencing batch reactor (2) are both connected to a fully mixed anaerobic reactor (3), the fully mixed anaerobic reactor (3) is connected to a sedimentation tank (4), and the sedimentation tank (4) is connected to a water outlet tank (5); The first sequencing batch reactor (1) and the second sequencing batch reactor (2) are connected via a first electric gate (c); the first sequencing batch reactor (1) and the fully mixed anaerobic reactor (3) are connected via a second electric gate (d); the second sequencing batch reactor (2) and the fully mixed anaerobic reactor (3) are connected via a third electric gate (e); the fully mixed anaerobic reactor (3) and the sedimentation tank (4) are connected via a first gate (f); and the sedimentation tank (4) and the effluent tank (5) are connected via a second gate (g); The first sequencing batch reactor (1), the second sequencing batch reactor (2) and the fully mixed anaerobic reactor (3) are used to form nutritional conditions in which feast periods and starvation periods alternate in time and space, so as to meet the requirements for operation under continuous flow conditions; By symmetrically setting up two SBRs to alternately inlet water, water flows upward from the bottom of the SBR, forming a matrix concentration gradient along the height direction, forming an alternation of feast period and starvation period in time and space, and meeting the nutritional conditions required for rapid granulation of granular sludge; The operation method includes five stages: SBR anaerobic water inlet, SBR aerobic aeration, SBR aerobic reflux, CSTR aeration stirring, and sedimentation separation. The total operation cycle is T, and the duration of each operation stage is adjustable. The anaerobic inflow of the first sequencing batch reactor (1) was regarded as the feast period, and the duration was set to T1; the aerobic reflow of the second sequencing batch reactor (2), the aerobic aeration of the second sequencing batch reactor (2) and the aeration stirring of the fully mixed anaerobic reactor (3) were regarded as the starvation period, and the durations were set to T2, T3 and T4 respectively, with a total duration of T5; the time required for the sludge not to be discharged from the reaction device was taken as the starting sedimentation time, and the sludge sedimentation time was gradually shortened from 20 min according to the changes in the sludge sedimentation performance and sludge concentration.

2. A continuous flow reaction device for promoting rapid formation of granular sludge according to claim 1, characterized in that: The water inlet system comprises a raw water barrel (6), wherein the raw water barrel (6) is connected to the first sequencing batch reactor (1) via a first metering pump (7) and a first water inlet pipe (a), and the raw water barrel (6) is connected to the second sequencing batch reactor (2) via a second metering pump (8) and a second water inlet pipe (b).

3. A continuous flow reaction device for promoting rapid formation of granular sludge according to claim 2, characterized in that: The aeration system comprises an SBR aeration pump (9) and a CSTR aeration pump (10); the SBR aeration pump (9) is connected to aeration plates inside the first sequencing batch reactor (1) and the second sequencing batch reactor (2) via an aeration pipe; and the CSTR aeration pump (10) is connected to an aeration plate inside the fully mixed anaerobic reactor (3) via an aeration pipe.

4. A continuous flow reaction device for promoting rapid formation of granular sludge according to claim 3, characterized in that: A first mixer (11) is installed in the first sequencing batch reactor (1) and the second sequencing batch reactor (2), and a second mixer (12) is installed in the fully mixed anaerobic reactor (3).

5. A continuous flow reaction device for promoting rapid formation of granular sludge according to claim 4, characterized in that: The sedimentation and sludge discharge system comprises a baffle (I) with an adjustable inclination angle arranged inside the sedimentation tank (4); the baffle (I) is connected to the bottom of the sedimentation tank (4) by a hinge, and the inclination angle is adjusted from 60° to 120° by a screw arranged on one side; heavy particles cannot pass over the baffle (I) and fall into a square sludge hopper with an inclination angle of 60°; light particles and flocs are discharged from the reaction device via a sludge discharge pipe (k).

6. A continuous flow reaction device for promoting rapid formation of granular sludge according to claim 5, characterized in that: The air lift reflux system comprises an air lift pump (13), wherein the air lift pump (13) connects the sedimentation tank (4) and the first sequencing batch reactor (1) via a first air lift reflux pipe (i), and connects the sedimentation tank (4) and the second sequencing batch reactor (2) via a second air lift reflux pipe (j), thereby air lifts and refluxes the granular sludge in the sedimentation tank (4) to the first sequencing batch reactor (1) and the second sequencing batch reactor (2).

7. A continuous flow reaction device for promoting rapid formation of granular sludge according to claim 6, characterized in that: The water outlet system comprises a perforated water collecting pipe (h) arranged at a certain height from the bottom of the water outlet pool (5), the perforated water collecting pipe (h) collects overflow water and discharges it out of the reactor through the water outlet pipe, and the other end of the water outlet pipe is connected to the water outlet collection bucket (14).

8. A continuous flow reaction device for promoting rapid formation of granular sludge according to claim 7, characterized in that: It also includes a PLC control system, which is connected to the reactor body, the water inlet system, the aeration system and the gas lift reflux system. The duration of each operating period is adjustable in the automatic mode, and the reaction device can be shut down for maintenance in the manual mode.

9. A continuous flow reaction device for promoting rapid formation of granular sludge according to claim 7, characterized in that: The first sequencing batch reactor (1) and the second sequencing batch reactor (2) are operated symmetrically to distribute water to the sludge layer of the first sequencing batch reactor (1) or the second sequencing batch reactor (2) at multiple points in the form of upflow, and the agitator and the aeration pump are kept closed to form a substrate concentration gradient along the height direction to promote the formation of anaerobic cores of granular sludge; The fully mixed anaerobic reactor (3) degrades pollutants through continuous aeration and stirring to promote the growth of sludge particles.

10. The method for operating a continuous flow reaction device for promoting rapid formation of granular sludge according to any one of claims 7 to 9, characterized in that: The operation method is used to purify eutrophic water bodies by filtering and removing algae, and specifically comprises the following steps: S1, sewage enters the first sequencing batch reactor (1) from the bottom through the first water inlet pipe (a) for anaerobic water inflow, at which time the first air stripping return pipe (i), the mixer and the aeration pump of the first sequencing batch reactor (1) are turned off; S2, the sewage enters the second sequencing batch reactor (2) through the first electric gate (c) for aerobic aeration, at which time the second gas lift return pipe (j) is closed, and the mixer and aeration pump of the second sequencing batch reactor (2) are turned on; S3, the sewage is aerobically refluxed in the second sequencing batch reactor (2), at which time the second air stripping reflux pipe (j), the stirrer of the second sequencing batch reactor (2) and the aeration pump of the second sequencing batch reactor (2) are turned on; S4, the sewage enters the fully mixed anaerobic reactor (3) through the third electric gate (e) for aerobic stirring, and at this time, the mixer and aeration pump of the fully mixed anaerobic reactor (3) are kept open; S5, the sewage enters the sedimentation tank (4) through the first gate (f) for sedimentation and separation, at which time the inclination angle of the baffle (I) is adjusted within the range of 60° to 120° according to the screening requirements for the sludge particle size; S5-1, heavy particles remain in the sludge hopper in the left area of ​​the baffle (I), and are lifted and refluxed to the second sequencing batch reactor (2) through the second air lift reflux pipe (j); S5-2, light particles and flocs cross the baffle (I) and enter the right area, and are discharged from the reaction device through the mud discharge pipe (k) at the bottom of the sedimentation tank (4); S5-3, sewage passes over the baffle (I) and enters the outlet tank (5) through the second gate (g); S6, after the water level in the outlet pool (5) exceeds the set value, the outlet water is collected through the perforated water collecting pipe (h) and then flows out of the reaction device.

11. The method for operating a continuous flow reaction device for promoting rapid formation of granular sludge according to claim 10, characterized in that: The operation method is used to purify eutrophic water bodies by filtering and removing algae, and specifically comprises the following steps: S1, sewage enters the second sequencing batch reactor (2) from the bottom through the second water inlet pipe (b) for anaerobic water inflow, at which time the second air stripping return pipe (j), the mixer and the aeration pump of the second sequencing batch reactor (2) are turned off; S2, the sewage enters the first sequencing batch reactor (1) through the first electric gate (c) for aerobic aeration, at which time the first gas lift return pipe (i) is closed, and the mixer and aeration pump of the first sequencing batch reactor (1) are turned on; S3, the sewage is aerobically refluxed in the first sequencing batch reactor (1), at which time the first air stripping reflux pipe (i), the stirrer of the first sequencing batch reactor (1) and the aeration pump of the second sequencing batch reactor (2) are turned on; S4, the sewage enters the fully mixed anaerobic reactor (3) through the second electric gate (d) for aerobic stirring, and at this time, the mixer and aeration pump of the fully mixed anaerobic reactor (3) are kept open; S5, the sewage enters the sedimentation tank (4) through the first gate (f) for sedimentation and separation, at which time the inclination angle of the baffle (I) is adjusted within the range of 60° to 120° according to the screening requirements for the sludge particle size; S5-1, heavy particles remain in the sludge hopper in the left area of ​​the baffle (I), and are air-lifted and refluxed to the first sequencing batch reactor (1) through the first air-lift reflux pipe (i); S5-2, light particles and flocs cross the baffle (I) and enter the right area, and are discharged from the reaction device through the mud discharge pipe (k) at the bottom of the sedimentation tank (4); S5-3, sewage passes over the baffle (I) and enters the outlet tank (5) through the second gate (g); S6, after the water level in the outlet pool (5) exceeds the set value, the outlet water is collected through the perforated water collecting pipe (h) and then flows out of the reaction device.

12. The method for operating a continuous flow reaction device for promoting rapid formation of granular sludge according to claim 10, characterized in that: The value of T is 240 min, the value of T1 is 60 min, the value of T2 is 40 min, the value of T3 is 20 min, the value of T4 is 110 min, and the value of T5 is 170 min.

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