CN114700170B - Aerobic granular sludge screening system and method - Google Patents
Aerobic granular sludge screening system and method Download PDFInfo
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- CN114700170B CN114700170B CN202210627253.6A CN202210627253A CN114700170B CN 114700170 B CN114700170 B CN 114700170B CN 202210627253 A CN202210627253 A CN 202210627253A CN 114700170 B CN114700170 B CN 114700170B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
- B03B5/34—Applications of hydrocyclones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/24—Multiple arrangement thereof
- B04C5/26—Multiple arrangement thereof for series flow
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention relates to the technical field of sewage treatment, and provides an aerobic granular sludge screening system and an aerobic granular sludge screening method. The primary cyclone screening device is provided with a tangential feeding hole, a first top discharging hole and a second bottom discharging hole, the discharging holes are connected with a primary four-way switching valve and have a first communication state and a second communication state, and the second discharging hole is communicated with the aerobic granular sludge biochemical reactor or the secondary screening system in the first communication state; in the second communication state, the first discharge port is communicated with the aerobic granular sludge biochemical reactor or the secondary screening system. The secondary screening system is similar to the primary screening system in structure, and is used for further screening the aerobic granular sludge. The invention provides a system and a method for screening aerobic granular sludge, which can screen returned sludge with proper concentration and specific gravity for an aerobic granular sludge biochemical reactor, optimize biological populations and improve reaction efficiency.
Description
Technical Field
The invention relates to the technical field of sewage treatment equipment, in particular to a system and a method for screening aerobic granular sludge.
Background
The aerobic granular sludge biochemical reactor utilizes a large amount of microorganisms to be condensed together to form compact granular sludge with excellent sedimentation performance, greatly improves the pollutant removal efficiency, and reduces the energy consumption and the construction cost. The aerobic granular sludge with smooth surface, large grain diameter and good sedimentation performance can bear higher organic load, is a high-quality microbial community and is retained in the reactor, and the light and flocculent sludge has low activity and poor sedimentation performance and is discharged out of the reactor.
The formation process of the aerobic granular sludge is complex and is influenced by various factors, such as colony types, carbon sources, temperature, pH, hydraulic shearing action, reactor types, operation modes and the like, and the efficient aerobic granular sludge reactor can be completely started only by controlling stable working conditions and long-time domestication culture, so that high-quality sludge is intercepted in the reactor, and a method for keeping the reactor to operate stably and sustainably is provided.
However, the conventional secondary sedimentation tank has no screening function.
Disclosure of Invention
The invention provides a system and a method for screening aerobic granular sludge, which are used for overcoming the defect that a secondary sedimentation tank in the prior art has no screening function, realizing the screening of returned sludge with proper concentration and specific gravity for an aerobic granular sludge biochemical reactor, optimizing biological population and improving reaction efficiency.
The invention provides an aerobic granular sludge screening system, which at least comprises a primary screening system, wherein the primary screening system comprises:
a primary screening system, the primary screening system comprising:
the primary sludge inlet pump is used for pumping out the sludge in the secondary sedimentation tank;
the first-stage cyclone screening device is arranged at the downstream of the first-stage sludge inlet pump, a first tangential feed inlet communicated with the first-stage sludge inlet pump is arranged on the side wall of the first-stage cyclone screening device, a first discharge outlet is arranged at the top of the first-stage cyclone screening device, and a second discharge outlet is arranged at the bottom of the first-stage cyclone screening device; the primary cyclone screening device is used for sinking the heavy sludge in a cyclone flow state and floating the light sludge;
the first-stage four-way switching valve is arranged at the downstream of the first-stage cyclone screening device and has a first communication state and a second communication state, and in the first communication state, the first discharge port is communicated with the residual sludge discharge tank; the second discharge hole is communicated with the aerobic granular sludge biochemical reactor; in the second communication state, the first discharge hole is communicated with the aerobic granular sludge biochemical reactor; and the second discharge hole is communicated with the residual sludge discharge tank.
According to the aerobic granular sludge screening system provided by the invention, the one-stage four-way switching valve comprises a first valve body and a first switching plate, the first valve body is provided with A, B, C, D four ports, wherein the port A is communicated with the first discharge port through a first pipeline, and the port C is communicated with the second discharge port through a second pipeline; the first switching plate is used for switching the communication state of the A, B, C, D four ports to form a first communication state and a second communication state;
in the first communication state, the port A is communicated with the port B to form a first channel, and the port C is communicated with the port D to form a second channel; in the second communication state, the port B is communicated with the port C to form a first channel, and the port A is communicated with the port D to form a second channel; the first channel is used for being communicated with the excess sludge discharge tank, the second channel is used for being communicated with the aerobic granular sludge biochemical reactor, and a first valve is arranged between the second channel and the aerobic granular sludge biochemical reactor.
The aerobic granular sludge screening system provided by the invention further comprises a secondary screening system, and the secondary screening system comprises:
one end of the secondary sludge inlet pump is communicated with the port D through a third pipeline, and a second valve is arranged on the third pipeline;
the second-stage cyclone screening device is arranged at the downstream of the second-stage sludge inlet pump, a second tangential feed inlet communicated with the second-stage sludge inlet pump is formed in the side wall of the second-stage cyclone screening device, a third discharge outlet is formed in the top of the second-stage cyclone screening device, and a fourth discharge outlet is formed in the bottom of the second-stage cyclone screening device;
the second-stage four-way switching valve is arranged at the downstream of the second-stage cyclone screening device and has a third communication state and a fourth communication state, and in the third communication state, the third discharge port is communicated with the aerobic granular sludge biochemical reactor; the fourth discharge hole is communicated with the excess sludge discharge tank; in the fourth communication state, the third discharge hole is communicated with a surplus sludge discharge tank; the fourth discharge hole is communicated with the aerobic granular sludge biochemical reactor.
According to the aerobic granular sludge screening system provided by the invention, the two-stage four-way switching valve comprises a second valve body and a second switching plate, the second valve body is provided with four ports a, b, c and d, wherein the port a is communicated with the third discharge port through a fourth pipeline, and the port c is communicated with the fourth discharge port through a fifth pipeline; the second switching plate is used for switching the communication states of the four ports a, b, c and d to form a third communication state and a fourth communication state;
in the third communication state, the port a is communicated with the port b to form a third channel, and the port c is communicated with the port d to form a fourth channel; in the fourth communication state, the port b is communicated with the port c to form a third channel, and the port a is communicated with the port d to form a fourth channel; the third channel is used for being communicated with the aerobic granular sludge biochemical reactor, and the fourth channel is used for being communicated with the residual sludge discharge tank.
According to the aerobic granular sludge screening system provided by the invention, the primary cyclone screening device is hollow, the top of the primary cyclone screening device is cylindrical, and the bottom of the primary cyclone screening device is conical.
According to the aerobic granular sludge screening system provided by the invention, the first pipeline is provided with the third valve, and the second pipeline is provided with the fourth valve.
According to the aerobic granular sludge screening system provided by the invention, the secondary cyclone screening device is hollow, the top of the secondary cyclone screening device is cylindrical, and the bottom of the secondary cyclone screening device is conical.
According to the aerobic granular sludge screening system provided by the invention, the fourth pipeline is provided with a fifth valve, and the fifth pipeline is provided with a sixth valve.
The invention also provides an aerobic granular sludge screening method, which comprises the following steps: the aerobic granular sludge screening system at least comprises a primary screening step, wherein the primary screening step comprises the following steps:
s1, pumping the sludge in the secondary sedimentation tank out to a primary cyclone screening device;
s2, floating the light sludge in a rotational flow state to a first discharge port to be discharged through rotation of the primary rotational flow screening device, and sinking the heavy sludge to be discharged from a second discharge port;
s3, switching a first communication state and a second communication state of the first-stage four-way switching valve through the first-stage four-way switching valve, wherein in the first communication state, the first discharge hole is communicated with a residual sludge discharge tank; the second discharge hole is communicated with the aerobic granular sludge biochemical reactor; in the second communication state, the first discharge hole is communicated with the aerobic granular sludge biochemical reactor; the second discharge hole is communicated with the excess sludge discharge tank; so that the aerobic granular sludge biochemical reactor can obtain two kinds of aerobic granular sludge with different concentrations.
The aerobic granular sludge screening method provided by the invention further comprises secondary screening, wherein the secondary screening comprises the following steps:
and the downstream of the primary screening is connected with the secondary screening in series, and four kinds of aerobic granular sludge with different concentrations can be obtained through the combined action of the primary screening and the secondary screening.
According to the aerobic granular sludge screening system provided by the invention, the sludge mixed liquid in the secondary sedimentation tank enters the primary cyclone screening device at a high speed and tangentially through the primary sludge inlet pump to form a cyclone flow state, heavy sludge sinks and is discharged from the second discharge port under the hydraulic action of the cyclone flow state, and light sludge floats and is discharged from the first discharge port; through the switching function of the one-level four-way switching valve, the first discharge port and the second discharge port can be switched to be communicated with the aerobic granular sludge biochemical reactor, so that aerobic granular sludge with different concentrations is obtained, then returned sludge with proper concentration and specific gravity is screened out for the aerobic granular sludge biochemical reactor, the biological population is optimized, and the reaction efficiency is improved.
Further, the present invention also provides an aerobic granular sludge screening method, which includes the above aerobic granular sludge screening system, and thus has various advantages as described above.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an aerobic granular sludge screening system provided by the present invention;
FIG. 2 is a schematic structural diagram of a primary cyclone screen provided by the present invention;
FIG. 3 is a schematic structural diagram of a one-stage four-way switching valve provided by the present invention;
FIG. 4 is a schematic structural view of a two-stage cyclone screen provided by the present invention;
FIG. 5 is a schematic structural diagram of a two-stage four-way switching valve provided by the invention;
reference numerals:
1: a first-stage sludge inlet pump; 2: a first-stage cyclone screening device; 3: a one-stage four-way switching valve; 4: a secondary sludge inlet pump; 5: a secondary cyclone screening device; 6: a two-stage four-way switching valve; 7: a fourth valve; 8: a third valve; 9: a first valve; 10: a sixth valve; 11: a second valve; 12: a fifth valve;
21: a first tangential feed inlet; 22: a second discharge port; 23: a first discharge port;
31: a first switching plate; 32: a first valve body;
51: a second tangential feed inlet; 52: a fourth discharge port; 53: a third discharge port;
61: a second switch board; 62: a second valve body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The aerobic granular sludge screening system provided by the invention is described in the following with reference to fig. 1 to 5.
As shown in fig. 1, the aerobic granular sludge screening system provided by the invention comprises a primary sludge inlet pump 1, a primary cyclone screening device 2 and a primary four-way switching valve 3, wherein the primary sludge inlet pump 1 is used for pumping out sludge in a secondary sedimentation tank; the primary cyclone screening device 2 is arranged at the downstream of the primary mud pump 1, as shown in fig. 2, a first tangential feed inlet 21 communicated with the primary mud pump 1 is arranged on the side wall, a first discharge outlet 23 is arranged at the top of the primary cyclone screening device 2, and a second discharge outlet 22 is arranged at the bottom of the primary cyclone screening device; the primary cyclone screening device 2 is used for sinking the heavy sludge in a cyclone flow state and floating the light sludge; the first-stage four-way switching valve 3 is arranged at the downstream of the first-stage cyclone screening device 2 and has a first communication state and a second communication state, and in the first communication state, the first discharge port 23 is communicated with the residual sludge discharge tank; the second discharge port 22 is communicated with the aerobic granular sludge biochemical reactor; in the second communication state, the first discharge port 23 is communicated with the aerobic granular sludge biochemical reactor; the second discharge port 22 is communicated with the surplus sludge discharge tank.
The lift of the first-stage sludge inlet pump 1 can reach 25-30 meters, so that the sludge mixed liquid enters the first-stage cyclone screening device 2 from the first tangential feed inlet in a high-speed tangential manner to form a cyclone flow state, heavy sludge sinks to be discharged from the second discharge outlet 22 under the action of the liquid hydraulic power, and light sludge floats to be discharged from the first discharge outlet 23; through the switching of the one-level four-way switching valve 3, the first discharge port 23 is communicated with the aerobic granular sludge biochemical reactor, or the second discharge port 22 is communicated with the aerobic granular sludge biochemical reactor, so that aerobic granular sludge with a first concentration and aerobic granular sludge with a second concentration are obtained respectively.
Wherein, the first-stage cyclone screening device 2 is hollow inside, the top is cylindrical, and the bottom is conical hopper-shaped. The first pipeline is provided with a third valve 8, and the second pipeline is provided with a fourth valve 7. The third valve 8 and the fourth valve 7 are used for controlling the communication and the cut-off of the first pipeline and the second pipeline.
Since the first outlet 23 discharges heavy sludge and the second outlet 22 discharges light sludge, the first concentration of aerobic granular sludge is greater than the second concentration. In the using process, the method can be selected according to requirements to screen the returned sludge with proper concentration and proportion for the aerobic granular sludge biochemical reactor, optimize the biological population and improve the reaction efficiency.
Further, the one-stage four-way switching valve 3 includes a first valve body 32 and a first switching plate 31, the first valve body 32 has A, B, C, D four ports, wherein the port a communicates with the first discharge port 23 through a first pipeline, and the port C communicates with the second discharge port 22 through a second pipeline; the first switching plate 31 is provided in the first valve body 32, and the first switching plate 31 is rotatable about a center axis for switching A, B, C, D the communication states of the four ports to form a first communication state and a second communication state.
In the first communication state, the port A is communicated with the port B to form a first channel, and the port C is communicated with the port D to form a second channel; the first channel is used for being communicated with the excess sludge discharge tank, and the second channel is used for being communicated with the aerobic granular sludge biochemical reactor. At this time, the first discharge port 23 is communicated with the surplus sludge discharge tank through a first passage; the second discharge port 22 is communicated with the aerobic granular sludge biochemical reactor through a second channel, and the aerobic granular sludge biochemical reactor obtains aerobic granular sludge with a second concentration. In the second communication state, the port B is communicated with the port C to form a first channel, and the port A is communicated with the port D to form a second channel; the first channel is used for being communicated with the excess sludge discharge tank, and the second channel is used for being communicated with the aerobic granular sludge biochemical reactor; at this time, the second discharge port 22 is communicated with the surplus sludge discharge tank through a first passage; the first discharge port 23 is communicated with the aerobic granular sludge biochemical reactor through a second channel, and the aerobic granular sludge biochemical reactor obtains aerobic granular sludge with a first concentration.
In one embodiment of the invention, a secondary screening system is also included, which comprises a secondary dredge pump 4, a secondary cyclone screen 5 and a secondary four-way switching valve 6.
One end of the secondary sludge inlet pump 4 is communicated with the port D through a third pipeline, and a second valve 11 is arranged on the third pipeline; and a first valve 9 is arranged between the second channel and the aerobic granular sludge biochemical reactor. The operation and the closing of the secondary screening system are realized through the opening and closing coordination of the first valve 9 and the second valve 11. When the first valve 9 is opened and the second valve 11 is closed, only the primary screening system works, and the secondary screening system does not work; when the first valve 9 is closed and the second valve 11 is opened, the primary screening system and the secondary screening system operate simultaneously.
The second-stage cyclone screening device 5 is arranged at the downstream of the second-stage sludge pump 4, a second tangential feeding hole 51 communicated with the second-stage sludge pump 4 is formed in the side wall of the second-stage cyclone screening device, a third discharging hole 53 is formed in the top of the second-stage cyclone screening device 5, and a fourth discharging hole 52 is formed in the bottom of the second-stage cyclone screening device. The second-stage sludge pump 4 pumps the mixed liquid screened by the first-stage screening system into the second-stage cyclone screening device 5 to form a cyclone flow state, and under the hydraulic action of the flow state, heavy sludge is discharged from the fourth discharge port 52, and light sludge is discharged from the third discharge port 53.
The second-stage four-way switching valve 6 is arranged at the downstream of the second-stage cyclone screening device 5 and has a third communication state and a fourth communication state, wherein in the third communication state, a third discharge port 53 is communicated with the aerobic granular sludge biochemical reactor, and a fourth discharge port 52 is communicated with the residual sludge discharge tank; in the fourth communication state, the third discharge port 53 is communicated with the surplus sludge discharge tank; the fourth discharge port 52 is communicated with the aerobic granular sludge biochemical reactor.
Further, the two-stage four-way switching valve 6 comprises a second valve body 62 and a second switching plate 61, wherein the second valve body 62 has four ports a, b, c and d, the port a is communicated with the third discharge port 53 through a fourth pipeline, and the port c is communicated with the fourth discharge port 52 through a fifth pipeline; the second switching plate 61 can rotate around the central shaft, and the second switching plate 61 is used for switching the communication states of the four ports a, b, c and d to form a third communication state and a fourth communication state;
in a third communication state, the port a is communicated with the port b to form a third channel, and the port c is communicated with the port d to form a fourth channel; in a fourth communication state, the port b is communicated with the port c to form a third channel, and the port a is communicated with the port d to form a fourth channel; the third channel is used for being communicated with the aerobic granular sludge biochemical reactor, and the fourth channel is used for being communicated with the excess sludge discharge tank.
The second-stage cyclone screening device 5 is hollow inside, the top of the second-stage cyclone screening device is cylindrical, and the bottom of the second-stage cyclone screening device is conical. A fifth valve 12 is arranged on the fourth pipeline, and a sixth valve 10 is arranged on the fifth pipeline. The fifth valve 12 and the sixth valve 10 are respectively arranged for controlling the connection and the disconnection of the fourth pipeline and the fifth pipeline.
When the primary screening system and the secondary screening system work simultaneously, the first valve 9 needs to be closed, the second valve 11 needs to be opened, and the third valve 8, the fourth valve 7, the fifth valve 12 and the sixth valve 10 need to be opened, so that four working conditions are divided.
The first working condition is as follows: the one-stage four-way switching valve 3 is in a first communication state, the port A is communicated with the port B, and the port C is communicated with the port D; the two-stage four-way switching valve 6 is in a third communication state, the port a is communicated with the port b, and the port c is communicated with the port d. The first-stage sludge pump 1 inputs sludge discharged from the secondary sedimentation tank into the first-stage cyclone screening device 2, heavy sludge is connected into the second-stage sludge inlet pump 4 through the second discharge port 22 and the port C and the port D of the first-stage four-way switching valve 3 and then is input into the second-stage cyclone screening device 5, light sludge is discharged through the third discharge port 53 and the port a and the port b of the second-stage four-way switching valve 6 and flows back into the aerobic granular sludge biochemical reactor to obtain aerobic granular sludge with a third concentration, and the sludge concentration is higher.
The second working condition is as follows: the one-stage four-way switching valve 3 is in a first communication state, the port A is communicated with the port B, and the port C is communicated with the port D; the second-stage four-way switching valve 6 is in a fourth communication state, the port a is communicated with the port d, and the port c is communicated with the port b; the first-stage sludge pump 1 inputs the sludge discharged from the secondary sedimentation tank into the first-stage cyclone screening device 2, the heavy sludge is connected into the second-stage sludge inlet pump 4 through the second discharge port 22 and the port D of the first-stage four-way switching valve 3, and then is input into the second-stage cyclone screening device 5, the heavy sludge is discharged through the fourth discharge port 52 and the port b and port C of the second-stage four-way switching valve 6, and flows back into the aerobic granular sludge biochemical reactor to obtain aerobic granular sludge with a fourth concentration, and the sludge concentration is high.
The third working condition is as follows: the one-level four-way switching valve 3 is in a second communication state, the port A is communicated with the port D, and the port C is communicated with the port B; the second-stage four-way switching valve 6 is in a third communication state, the port a is communicated with the port b, and the port c is communicated with the port d; the first-stage sludge pump 1 inputs sludge discharged from the secondary sedimentation tank into the first-stage cyclone screening device 2, light sludge is connected into the second-stage sludge inlet pump 4 through the first discharge port 23 and the port D of the first-stage four-way switching valve 3 and then is input into the second-stage cyclone screening device 5, the light sludge is discharged through the third discharge port 53 and the port a and the port b of the second-stage four-way switching valve 6 and flows back into the aerobic granular sludge biochemical reactor to obtain aerobic granular sludge with the fifth concentration, and the sludge concentration is low.
The fourth working condition is as follows: the one-level four-way switching valve 3 is in a second communication state, the port A is communicated with the port D, and the port C is communicated with the port B; the second-stage four-way switching valve 6 is in a fourth communication state, the port a is communicated with the port b, and the port c is communicated with the port d; the first-stage sludge pump 1 inputs sludge discharged from the secondary sedimentation tank into the first-stage cyclone screening device 2, light sludge is connected into the second-stage sludge inlet pump 4 through the first discharge port 23 and the port D of the first-stage four-way switching valve 3 and then is input into the second-stage cyclone screening device 5, heavy sludge is discharged through the fourth discharge port 52 and the port b and port C of the second-stage four-way switching valve 6 and flows back into the aerobic granular sludge biochemical reactor to obtain aerobic granular sludge with the sixth concentration, and the sludge concentration is lower.
The above six conditions correspond to the following tables, respectively:
in another aspect, the present invention further provides a method for screening aerobic granular sludge, comprising: the aerobic granular sludge screening system at least comprises primary screening, and the primary screening comprises the following steps:
s1, pumping the sludge in the secondary sedimentation tank out to the primary cyclone screening device 2;
s2, floating the light sludge in the rotational flow state to the first discharge port for discharge and sinking the heavy sludge to the second discharge port 22 for discharge through the rotation of the primary rotational flow screening device 2;
s3, switching a first communication state and a second communication state of the first-stage four-way switching valve 3, wherein in the first communication state, a first discharge port 23 is communicated with the residual sludge discharge tank; the second discharge port 22 is communicated with the aerobic granular sludge biochemical reactor; in a second communication state, the first discharge port 23 is communicated with the aerobic granular sludge biochemical reactor; the second discharge port 22 is communicated with the excess sludge discharge tank; so that the aerobic granular sludge biochemical reactor can obtain two kinds of aerobic granular sludge with different concentrations.
In a specific embodiment of the invention, the secondary screening comprises the steps of:
the downstream of the primary screening is connected with the secondary screening in series, and four kinds of aerobic granular sludge with different concentrations can be obtained through the combined action of the primary screening and the secondary screening.
In conclusion, the aerobic granular sludge screening system and the method provided by the invention have the advantages that the sludge mixed liquid in the secondary sedimentation tank enters the primary cyclone screening device 2 tangentially at a high speed through the primary sludge pump to form a cyclone flow state, heavy sludge sinks to be discharged from the second discharge hole 22 under the hydraulic action of the cyclone flow state, and light sludge floats to be discharged from the first discharge hole 23; through the switching action of the one-level four-way switching valve 3, the first discharge port 23 and the second discharge port 22 can be switched to be communicated with the aerobic granular sludge biochemical reactor, so that aerobic granular sludge with different concentrations is obtained, then returned sludge with proper concentration and specific gravity is screened out for the aerobic granular sludge biochemical reactor, the biological population is optimized, and the reaction efficiency is improved. Meanwhile, the secondary screening system is connected with the primary screening system in series, four kinds of aerobic granular sludge with different concentrations can be obtained through switching of the primary four-way switching valve 3 and the secondary four-way switching valve 6, return sludge with appropriate concentration and specific gravity can be screened out according to requirements, biological populations are optimized, and reaction efficiency is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The aerobic granular sludge screening system is characterized by at least comprising a primary screening system, wherein the primary screening system comprises:
the primary sludge inlet pump is used for pumping out the sludge in the secondary sedimentation tank;
the first-stage cyclone screening device is arranged at the downstream of the first-stage sludge inlet pump, a first tangential feed inlet communicated with the first-stage sludge inlet pump is arranged on the side wall of the first-stage cyclone screening device, a first discharge outlet is arranged at the top of the first-stage cyclone screening device, and a second discharge outlet is arranged at the bottom of the first-stage cyclone screening device; the primary cyclone screening device is used for enabling heavy sludge in a cyclone flow state to flow to the second discharge hole and light sludge to flow to the first discharge hole;
the first-stage four-way switching valve is arranged at the downstream of the first-stage cyclone screening device and has a first communication state and a second communication state, and in the first communication state, the first discharge port is communicated with the residual sludge discharge tank; the second discharge hole is communicated with the aerobic granular sludge biochemical reactor or the secondary screening system; in the second communication state, the first discharge port is communicated with the aerobic granular sludge biochemical reactor or the secondary screening system; the second discharge hole is communicated with the excess sludge discharge tank;
the secondary screening system comprises:
one end of the second-stage sludge inlet pump is communicated with the first-stage four-way switching valve through a third pipeline, and a second valve is arranged on the third pipeline;
the second-stage cyclone screening device is arranged at the downstream of the second-stage sludge inlet pump, a second tangential feed inlet communicated with the second-stage sludge inlet pump is formed in the side wall of the second-stage cyclone screening device, a third discharge outlet is formed in the top of the second-stage cyclone screening device, and a fourth discharge outlet is formed in the bottom of the second-stage cyclone screening device;
the second-stage four-way switching valve is arranged at the downstream of the second-stage cyclone screening device and has a third communication state and a fourth communication state, and in the third communication state, the third discharge port is communicated with the aerobic granular sludge biochemical reactor; the fourth discharge hole is communicated with the excess sludge discharge tank; in the fourth communication state, the third discharge hole is communicated with a surplus sludge discharge tank; and the fourth discharge hole is communicated with the aerobic granular sludge biochemical reactor.
2. The aerobic granular sludge screening system as claimed in claim 1, wherein the one-stage four-way switching valve comprises a first valve body and a first switching plate, the first valve body has A, B, C, D four ports, wherein port A is communicated with the first discharge port through a first pipeline, and port C is communicated with the second discharge port through a second pipeline; the first switching plate is used for switching the communication state of the A, B, C, D four ports to form a first communication state and a second communication state;
in the first communication state, the port A is communicated with the port B to form a first channel, and the port C is communicated with the port D to form a second channel; in the second communication state, the port B is communicated with the port C to form a first channel, and the port A is communicated with the port D to form a second channel; the first channel is used for being communicated with the excess sludge discharge tank, the second channel is used for being communicated with the aerobic granular sludge biochemical reactor or the secondary screening system, and a first valve is arranged between the second channel and the aerobic granular sludge biochemical reactor.
3. The aerobic granular sludge screening system of claim 2, wherein the two-stage four-way switching valve comprises a second valve body and a second switching plate, the second valve body has four ports a, b, c and d, wherein the port a is communicated with the third discharge port through a fourth pipeline, and the port c is communicated with the fourth discharge port through a fifth pipeline; the second switching plate is used for switching the communication states of the four ports a, b, c and d to form a third communication state and a fourth communication state;
in the third communication state, the port a is communicated with the port b to form a third channel, and the port c is communicated with the port d to form a fourth channel; in the fourth communication state, the port b is communicated with the port c to form a third channel, and the port a is communicated with the port d to form a fourth channel; the third channel is used for being communicated with the aerobic granular sludge biochemical reactor, and the fourth channel is used for being communicated with the residual sludge discharge tank.
4. The aerobic granular sludge screening system as claimed in claim 1, wherein the primary cyclone screening device is hollow inside, and has a cylindrical top and a conical hopper-shaped bottom.
5. The aerobic granular sludge screening system as claimed in claim 2, wherein the first pipeline is provided with a third valve, and the second pipeline is provided with a fourth valve.
6. The aerobic granular sludge screening system as claimed in claim 1, wherein the secondary cyclone screening device is hollow inside, and has a cylindrical top and a conical hopper bottom.
7. The aerobic granular sludge screening system as claimed in claim 3, wherein a fifth valve is provided on the fourth pipeline, and a sixth valve is provided on the fifth pipeline.
8. An aerobic granular sludge screening method, wherein the aerobic granular sludge screening system according to any one of claims 1 to 7 is used, and the screening method comprises at least one primary screening step, wherein the primary screening step comprises the following steps:
s1, pumping the sludge in the secondary sedimentation tank out to a primary cyclone screening device;
s2, floating the light sludge in a rotational flow state to a first discharge port to be discharged through rotation of the primary rotational flow screening device, and sinking the heavy sludge to be discharged from a second discharge port;
s3, switching a first communication state and a second communication state of the first-stage four-way switching valve through the first-stage four-way switching valve, wherein in the first communication state, the first discharge hole is communicated with the residual sludge discharge tank; the second discharge hole is communicated with the aerobic granular sludge biochemical reactor; in the second communication state, the first discharge port is communicated with the aerobic granular sludge biochemical reactor; the second discharge hole is communicated with the excess sludge discharge tank; so that the aerobic granular sludge biochemical reactor can obtain two kinds of aerobic granular sludge with different concentrations.
9. The aerobic granular sludge screening method of claim 8, further comprising a secondary screening, wherein the secondary screening comprises the steps of:
and the downstream of the primary screening is connected with the secondary screening in series, and four kinds of aerobic granular sludge with different concentrations can be obtained through the combined action of the primary screening and the secondary screening.
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