CN108467106B - Aerobic granular sludge continuous flow type reactor and working method thereof - Google Patents
Aerobic granular sludge continuous flow type reactor and working method thereof Download PDFInfo
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- CN108467106B CN108467106B CN201810328119.XA CN201810328119A CN108467106B CN 108467106 B CN108467106 B CN 108467106B CN 201810328119 A CN201810328119 A CN 201810328119A CN 108467106 B CN108467106 B CN 108467106B
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- 239000010802 sludge Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 210
- 238000002156 mixing Methods 0.000 claims abstract description 64
- 230000001546 nitrifying effect Effects 0.000 claims abstract description 25
- 238000005276 aerator Methods 0.000 claims abstract description 21
- 239000007921 spray Substances 0.000 claims abstract description 17
- 238000004062 sedimentation Methods 0.000 claims abstract description 13
- 238000012163 sequencing technique Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 66
- 238000005273 aeration Methods 0.000 claims description 45
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 43
- 239000001301 oxygen Substances 0.000 claims description 43
- 229910052760 oxygen Inorganic materials 0.000 claims description 43
- 239000000523 sample Substances 0.000 claims description 32
- 238000010992 reflux Methods 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 12
- 239000008247 solid mixture Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000003756 stirring Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 15
- 244000005700 microbiome Species 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 4
- 238000006396 nitration reaction Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000004176 ammonification Methods 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000036284 oxygen consumption Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 241001453382 Nitrosomonadales Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
-
- 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
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- 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
An aerobic granular sludge continuous flow type reactor, wherein an annular water baffle of the reactor is concentrically arranged at the upper end inside a tank body, and an annular area between the annular water baffle and the tank body is a sedimentation area; the aerator system is arranged in the tank body, and a nitrifying area is arranged between the upper part of the aerator system and the inside of the annular water baffle; a denitrification region is arranged below the aerator system, and a space from the lower part of the denitrification region to the bottom of the tank is a water distribution mixing region; the gas-water separator is arranged at the top of the tank body, one end of the upper return pipe is connected to the bottom of the gas-water separator, and the other end of the upper return pipe is positioned in the nitrifying zone and is provided with a plurality of upper return spray heads. The invention is started by using flocculent sludge to form aerobic granular sludge, an external circulation system enters the bottom of the reactor by using air jet flow, the controllability of mass transfer and flow velocity is good, and the circulation, mixing, stirring and denitrification functions of the system are enhanced. The reactor can realize large height-diameter ratio and low energy consumption operation, and realize the integrated equipment of the aerobic granular sludge sequencing batch reactor.
Description
Technical Field
The invention relates to a biological aerobic granular sludge reactor, belongs to the technical field of aerobic granular sludge, and in particular relates to an aerobic granular sludge continuous flow reactor (Aerobic granular sludge continuous flow reactor, AGS-CFR reactor).
Technical Field
The aerobic granular sludge (Aerobic Granular Sludge, AGS) is granular activated sludge formed by the self-agglomeration of microorganisms, and compared with the common activated sludge, the aerobic granular sludge has the characteristics of difficult occurrence of sludge expansion, strong shock resistance, capability of bearing high organic load, integration of microorganisms (aerobic, facultative and anaerobic microorganisms) with different properties and the like. The self-coagulation process of microorganisms is a complex physical, chemical and biological process, the granulation of which is influenced by various environmental factors, a reactor with a large height-diameter ratio and a large aeration amount are generally adopted to provide proper hydraulic shear force for the self-coagulation of microorganisms, and the energy consumption of aeration is increased due to the too high reactor, which restricts the application of Aerobic Granular Sludge (AGS) technology in practical engineering.
The traditional biological denitrification process is a complete biological denitrification process comprising ammonification, nitrification and denitrification, and is that the aerobic nitrification process and the anoxic denitrification are completed sequentially or alternately, and the organic nitrogen is oxidatively decomposed into NH by the action of ammonification bacteria 4+ -N; NH was then taken up by autotrophic nitrifying bacteria 4+ Oxidation of N to NO 2- -N and NO 3- -N; then NO 2- -N and NO 3- Reduction of N to N by denitrifying bacteria 2 Or other nitrogen oxides, finally N 2 Releasing the nitrogen into the atmosphere, thereby achieving the aim of denitrification. In the whole nitration process, the oxygen consumption equivalent is 2.86g O 2 /gNO 3 N, the process of which greatly increases the overall energy consumption and operating costs of the sewage treatment process, in order to satisfy the aeration required for the complete nitration reaction.
The principle of the short-cut nitrification and denitrification process is to control the oxidation of ammonia nitrogen to NO by utilizing the conversion difference of ammonia oxidizing bacteria and nitrite oxidizing bacteria nitrogen 2 The N stage omits the oxidation of nitrite to nitrate and the reduction of nitrite in the traditional biological denitrification, and the oxygen consumption equivalent of the short-cut nitrification and denitrification process is 1.71gO 2 /gNO 3 And N, the overall energy consumption and the running cost of the sewage treatment process are greatly reduced. But engineering applications are rarely examples, forming fewer integrated equipment applications.
At present, the traditional continuous flow type biological aerobic process comprises an oxidation ditch, a deformation process thereof, a biological contact oxidation pond and the like, and is mainly a pond body with a concrete structure, wherein the depth of the pond body is generally less than 8 meters, the occupied area is large, the oxygen utilization rate is low, the oxygen supply energy consumption is high, flocculent mud is operated, a process system cannot provide hydraulic shear force required for forming Aerobic Granular Sludge (AGS), and the problems of load impact, insufficient carbon source, sludge expansion and the like are easily caused. Therefore, on the existing sequencing batch biological aerobic process, by combining the aeration working condition of a blower and through reasonable design of hydraulic power and mass transfer, the hydraulic shear force and the dissolved oxygen utilization rate are improved, functional partitions are reasonably arranged, the total biological amount of the reactor is improved, the nitrifying and denitrifying synchronous functional area of the reactor is enhanced, and the flocculent sludge is utilized to start and quickly form aerobic granular sludge, so that the continuous operation of the bioreactor for the aerobic granular sludge is necessary.
Disclosure of Invention
Aiming at the defects of the traditional continuous flow type biological aerobic process and equipment, the invention provides a reactor for continuous flow type work of biological aerobic granular sludge, through reasonable design of waterpower and mass transfer, the functional partition of nitrification and denitrification is reasonably arranged, the total biological quantity of the reactor is improved, the nitrifying and denitrification synchronous functional area of the reactor is enhanced, the hydraulic shear force and the dissolved oxygen utilization rate are improved, flocculent sludge can be utilized to start to form aerobic granular sludge, and the integrated equipment of the aerobic granular sludge continuous flow type reactor is realized.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an aerobic granular sludge continuous flow type reactor comprises a tank body, an aeration system, a water inlet pipe, a gas-water separator, an upper return pipe, an upper return nozzle, a lower return pipe, a first cross pipe, a lower return nozzle, a gas collecting hood, a gas collecting pipe, a decanter, a drain pipe, an outer circulation pump, a pipeline jet device, a second cross pipe, an inner guide plate, a middle guide plate, a conical mud returning plate, an inclined plate, a water outlet weir and an annular water baffle;
the annular water baffle is concentrically arranged at the upper end of the interior of the tank body, and an annular area between the annular water baffle and the tank body is a sedimentation area; the aerator system is arranged in the tank body, and a nitrifying area is arranged between the upper part of the aerator system and the inside of the annular water baffle; a denitrification region is arranged below the aerator system, and a space from the lower part of the denitrification region to the bottom of the tank is a water distribution mixing region;
the gas-water separator is arranged at the top of the tank body, one end of the upper return pipe is connected to the bottom of the gas-water separator, and the other end of the upper return pipe is positioned in the nitrifying zone and is provided with a plurality of upper return spray heads; one end of a lower return pipe is connected to the bottom of the gas-water separator, the other end of the lower return pipe is connected to a first cross pipe, and a plurality of lower return spray heads are arranged on the first cross pipe;
the gas collecting hood is arranged above the aerator system, the lower end of the gas collecting pipe is connected with the cone top of the gas collecting hood, and the upper end of the gas collecting pipe is connected with the gas-water separator through a horizontal pipe;
one end of the outer circulating pipe is arranged above the gas collecting cover of the nitrifying zone in the tank body, the other end of the outer circulating pipe sequentially passes through the outer circulating pump and the pipeline jet device and is connected to the second cross pipe through one way of the three-way pipe, the other way of the three-way pipe is connected with the mud discharging pipe, and a plurality of outer circulating water inlet nozzles are arranged on the second cross pipe;
the inner guide plate and the middle guide plate are circular arcs concentric with the tank body, and the inner guide plate and the middle guide plate divide the water distribution mixing region into an inner rotation mixing region, a middle rotation mixing region and an outer rotation mixing region from the center of the tank body outwards in sequence;
the small diameter end of the conical mud returning plate is fixedly connected with the lower end of the annular water blocking plate, the large diameter end of the conical mud returning plate is arranged below, a water passing channel is arranged between the large diameter end of the conical mud returning plate and the pipe wall, a plurality of inclined plates are arranged above the conical mud returning plate in the sedimentation area, a plurality of water outlet weirs are arranged above the inclined plates, each water outlet weir is groove-shaped, each water outlet weir is arranged along the diameter direction of the tank body, one end of a drain pipe is connected to the water outlet weir, and the other end of the drain pipe is connected to the outside of the tank body;
the water inlet pipe is arranged in the water distribution mixing area of the tank body.
Further, the device also comprises a gas collecting tube control valve, a lower return tube control valve, an upper return tube control valve, a drain valve, an aeration control valve, a circulation control valve, a mud valve, a pipeline ejector water inlet valve, a pipeline ejector water outlet valve, a water inlet pipe control valve, a denitrification zone dissolved oxygen probe, a nitrification zone dissolved oxygen probe and a control system;
the gas collecting tube control valve is arranged on the gas collecting tube, the lower return tube control valve is arranged on the lower return tube, the upper return tube control valve is arranged on the upper return tube, the drain valve is arranged on the drain pipe, the aeration control valve is arranged on the aeration system, the circulation control valve is arranged on the outer circulation pipe, the mud discharge valve is arranged on the mud discharge pipe, the inlet valve of the pipeline jet device is arranged on the inlet of the pipeline jet device, the outlet valve of the pipeline jet device is arranged on the outlet of the pipeline jet device, the inlet tube control valve is arranged on the inlet tube, the dissolved oxygen probe in the denitrification zone is arranged in the nitrification zone, and the dissolved oxygen probe in the nitrification zone is arranged in the nitrification zone.
Further, the automatic control system also comprises a control system, wherein the external circulation pump system, the gas collecting tube control valve, the lower return tube control valve, the upper return tube control valve, the drain valve, the aeration control valve, the circulation control valve, the mud valve, the pipeline ejector water inlet valve, the pipeline ejector water outlet valve, the water inlet pipe control valve, the denitrification zone dissolved oxygen probe and the nitrification zone dissolved oxygen probe are all connected with the control system to realize automatic control work.
Further, the jet flow direction of the water inlet pipe, the jet flow directions of the upper reflux spray heads, the jet flow directions of the lower reflux spray heads and the jet flow directions of the outer circulation water inlet spray heads are the same and all along the secant direction of the cross section of the tank body; the jet flow direction of the horizontal pipe at the upper end of the gas collecting pipe is along the secant direction of the cross section of the gas-water separator.
Further, the parts of the pipe arms of the first cross pipe, which are positioned in the internal rotation mixing area, the middle rotation mixing area and the external rotation mixing area, are respectively provided with a lower reflux nozzle; the parts of the pipe arms of the second cross pipe, which are positioned in the internal rotation mixing area, the middle rotation mixing area and the external rotation mixing area, are respectively provided with an external circulation water inlet nozzle.
Further, the aeration system is any one of a membrane aerator, a rotary mixing aerator or an aeration pipe; the decanter is a pontoon type decanter or other liftable decanters; the bottom of the gas-water separator is conical with the small diameter end at the lower part.
Further, the number of the inner guide plates and the middle guide plates is more than or equal to 2, the arc length of each inner guide plate and each middle guide plate is less than or equal to 1/4 circumference, each inner guide plate is uniformly distributed on the circumference, each middle guide plate is also uniformly distributed on the circumference, and the inner guide plates and the middle guide plates are staggered.
Further, the first cross pipe and the second cross pipe are arranged in a crossing way, the inner guide plate is arranged at the bottom of the tank, and the middle guide plate is fixed at the bottom of the tank through supporting legs.
The working method of the aerobic granular sludge continuous flow type reactor,
when in operation, the system is divided into four stages of water inlet, aeration, precipitation and drainage, and the sequencing batch is repeatedly operated;
(1) Raw water enters a water distribution mixing area from a water inlet pipe through a water inlet pipe control valve in the water inlet stage; starting an external circulation pump system, opening a circulation control valve, a pipeline ejector water inlet valve and a pipeline ejector water outlet valve, enabling circulating water and air to enter from an external circulation water inlet nozzle of a water distribution mixing region, enabling the circulating water and the air to tangentially flow into a guide flow by a tank wall of an inner guide plate, a middle guide plate and a tank body to rotate and mix with the inlet water, gradually rising to a nitrification region through a denitrification region, completing water inlet work after reaching a set water level, and stopping an external circulation pump;
(2) Starting an aeration system, forming density difference between the gas, liquid and solid mixture in the gas collecting hood and the gas-water separator, lifting to the top of the gas collecting hood, refluxing a part of the gas, liquid and solid mixture to the outside of the gas collecting hood through an upper reflux pipe, injecting the mixture through an upper reflux nozzle, forming rotary mixing and sinking into the gas collecting hood, and lifting again to form upper circulation; the other part of the gas, liquid and solid mixture flows back to the bottom of the tank body through a lower return pipe and is ejected by a lower return nozzle, and is tangentially and rotationally mixed by the inner guide plate, the middle guide plate and the wall of the tank body to form a rotary mixing flow, and rises to enter the gas collecting hood, and is lifted again to form a large circulation; the external drainage enters a sedimentation zone, sludge is choked by an inclined plate and sinks to enter a gas collecting hood again, and clear liquid overflows from the top of the inclined plate and enters an effluent weir to realize continuous flow type external drainage; the control system adjusts the aeration system and the external circulation pump system to run in an alternating mode according to the feedback data of the dissolved oxygen probe in the denitrification zone and the dissolved oxygen probe in the nitrification zone, and the aeration stage is completed after the set time or the requirement of water quality treatment is reached;
(3) The water decanter can drain water simultaneously along with the precipitation, and a period is completed when the water level reaches a set water level, so that the water decanter can enter the water inlet stage again for sequencing batch circulation.
The aeration system intermittently or continuously works according to feedback data of the dissolved oxygen probe of the nitrifying zone and the dissolved oxygen probe of the denitrifying zone, the dissolved oxygen of the nitrifying zone is controlled to be 0.8-2.0mg/L, the dissolved oxygen of the denitrifying zone is controlled to be 0.5-0.8mg/L, a lower return pipe control valve is used for adjusting 20-70% of the reflux quantity of the gas-water separator to enter a water distribution mixing zone of the denitrifying zone, and an upper return pipe control valve is used for adjusting 30-80% of the reflux quantity of the gas-water separator to enter an upper return nozzle of the nitrifying zone for ejection.
The aerobic granular sludge continuous flow type reactor has the following advantages:
(1) The structural design is ingenious and simple. The internal and external circulation functions realize rapid mixing, and have excellent mass transfer effect and strong load impact resistance.
(2) The reasonable design of water power and mass transfer ensures that the density pressure difference generated by the reactor under the aeration working condition forms gas stripping energy, and then the potential difference and the pressure difference are utilized to ensure that fluid is discharged and sprayed out to form rotary mixing, so that the fluid speed is improved, the water power shearing force is enhanced, the path and the residence time of air in water are improved, the utilization rate of oxygen is improved, and flocculent sludge can be utilized for starting to form Aerobic Granular Sludge (AGS).
(3) The functional partitions of nitrification and denitrification are reasonably arranged, the total biological quantity of the reactor is improved, and the functional area of the reactor for nitrifying and denitrifying is synchronously improved.
(4) The external circulation system utilizes air jet flow to enter the bottom of the reactor, has good controllability of mass transfer and flow velocity, strengthens the circulation, mixing, stirring and denitrification functions of the system, and ensures that the system has continuous water inlet and intermittent water inlet working modes.
(5) So that the reactor can realize high height-diameter ratio and low energy consumption operation.
(6) Realizing the integrated equipment of the aerobic granular sludge continuous flow type reactor.
Drawings
Fig. 1: the structure of the aerobic granular sludge continuous flow reactor is schematically shown.
Fig. 2: the structure of the water distribution mixing zone is schematically shown.
In the figure:
1. tank body, 2, gas-water separator, 3, sedimentation zone, 4, gas-collecting hood, 5, aeration system, 6, control system, 7, water distribution mixing zone, 8, nitration zone, 9, denitrification zone, 10, lower reflux pipe, 11, upper reflux pipe, 12, lower reflux nozzle, 13, upper reflux nozzle, 14, gas-collecting tube, 20, external circulation pump,
15 gas collecting tube control valve, 16, lower return tube control valve, 17, upper return tube control valve, 18, drain valve, 19, aeration control valve, 21, circulation control valve, 22, mud valve, 23, pipeline ejector water inlet valve, 24, pipeline ejector water outlet valve, 25, water inlet tube control valve,
26. a water inlet pipe, 27, a pipeline jet device, 28, a pipeline jet device air suction pipe, 29, an external circulation water inlet spray head, 30, an internal guide plate, 31, a middle guide plate, 32, an internal mixing zone, 33, a middle mixing zone, 34, an external mixing zone, 35, a denitrification zone dissolved oxygen probe, 36, a nitrification zone dissolved oxygen probe and 37 external circulation pipes,
38. the mud returning plate, 39, the sloping plate, 40, the water outlet weir, 41 and the water baffle.
Detailed Description
The invention will be further illustrated with reference to examples, figures, to which the invention is not limited.
Example 1
An aerobic granular sludge continuous flow type reactor comprises a tank body 1, an aeration system 5, a water inlet pipe 26, a gas-water separator 2, an upper return pipe 11, an upper return nozzle 13, a lower return pipe 10, a first cross pipe, a lower return nozzle 12, a gas collecting hood 4, a gas collecting pipe 14, a decanter 3, a water discharge pipe, an outer circulation pipe 37, an outer circulation pump 20, a pipeline jet 27, a second cross pipe, an inner guide plate 30, a middle guide plate 31, a conical mud return plate 38, an inclined plate 39, a water outlet weir 40 and an annular water baffle 41;
the annular water baffle 41 is concentrically arranged at the upper end of the interior of the tank body 1, and an annular area between the annular water baffle 19 and the tank body 1 is a sedimentation area 8; the aerator system 5 is arranged in the tank body 1, and a nitrifying zone 8 is arranged between the upper part of the aerator system 5 and the inside of the annular water baffle 41; a denitrification region 9 is arranged below the aerator system 5, and a water distribution mixing region 6 is arranged in a space from the lower part of the denitrification region 9 to the bottom of the tank;
the gas-water separator 2 is arranged at the top of the tank body 1, one end of an upper return pipe 11 is connected to the bottom of the gas-water separator 2, and the other end of the upper return pipe 11 is positioned in the nitration zone 8 and is provided with a plurality of upper return spray heads 13; one end of a lower return pipe 10 is connected to the bottom of the gas-water separator 2, the other end of the lower return pipe 10 is connected to a first cross pipe, and a plurality of lower return spray heads 12 are arranged on the first cross pipe;
the gas collecting hood 4 is arranged above the aerator system 5, the lower end of the gas collecting tube 14 is connected to the cone top of the gas collecting hood 4, and the upper end of the gas collecting tube 14 is connected to the gas-water separator 2 through a horizontal tube;
one end of an outer circulation pipe 37 is arranged above the gas collecting hood 4 of the nitrifying zone 8 in the tank body 1, the other end of the outer circulation pipe 37 sequentially passes through the outer circulation pump 20 and the pipeline jet device 27 and then is connected to a second cross pipe through a three-way pipe, the other way is connected with a mud discharging pipe, and a plurality of outer circulation water inlet nozzles 29 are arranged on the second cross pipe;
the inner deflector 30 and the middle deflector 31 are circular arcs concentric with the tank body, and the inner deflector 30 and the middle deflector 31 divide the water distribution mixing zone 6 into an inner mixing zone 32, a middle mixing zone 33 and an outer mixing zone 34 from the center of the tank body 1 outwards in sequence;
the small diameter end of the conical mud returning plate 38 is fixedly connected with the lower end of the annular water blocking plate 41, the large diameter end of the conical mud returning plate 38 is arranged below, a water passing channel is arranged between the large diameter end of the conical mud returning plate 38 and the pipe wall 1, a plurality of inclined plates 39 are arranged above the conical mud returning plate 38 of the sedimentation area 8, a plurality of water outlet weirs 40 are arranged above the inclined plates 39, each water outlet weir 40 is groove-shaped, each water outlet weir 40 is arranged along the diameter direction of the tank body, one end of a water discharging pipe is connected to the water outlet weirs 40, and the other end of the water discharging pipe is connected to the outside of the tank body;
the water inlet pipe 26 is arranged in the water distribution mixing area 6 of the tank body 1.
Further, the device also comprises a gas collecting tube control valve 15, a lower return tube control valve 16, an upper return tube control valve 17, a drain valve 18, an aeration control valve 19, a circulation control valve 21, a mud valve 22, a pipeline ejector water inlet valve 23, a pipeline ejector water outlet valve 24, a water inlet tube control valve 25, a denitrification zone dissolved oxygen probe 35, a nitrification zone dissolved oxygen probe 36 and a control system 6;
the gas collecting pipe control valve 15 is arranged on the gas collecting pipe 14, the lower return pipe control valve 16 is arranged on the lower return pipe 10, the upper return pipe control valve 17 is arranged on the upper return pipe 11, the drain valve 18 is arranged on the drain pipe, the aeration control valve 19 is arranged on the aeration system 5, the circulation control valve 21 is arranged on the outer circulation pipe 37, the mud discharge valve 22 is arranged on the mud discharge pipe, the pipeline jet inlet valve 23 is arranged on the inlet of the pipeline jet 27, the pipeline jet outlet valve 24 is arranged on the outlet of the pipeline jet 27, the water inlet pipe control valve 25 is arranged on the water inlet pipe 26, the dissolved oxygen probe 35 in the denitrification zone is arranged in the denitrification zone, and the dissolved oxygen probe 36 in the nitrification zone is arranged in the nitrification zone.
Further, the system also comprises a control system 6, wherein an external circulation pump system 20, a gas collecting pipe control valve 15, a lower return pipe control valve 16, an upper return pipe control valve 17, a drain valve 18, an aeration control valve 19, a circulation control valve 21, a mud discharging valve 22, a pipeline ejector water inlet valve 23, a pipeline ejector water outlet valve 24, a water inlet pipe control valve 25, a denitrification zone dissolved oxygen probe 35 and a nitrification zone dissolved oxygen probe 36 are all connected with the control system 6 to realize automatic control work.
Further, the jet direction of the water inlet pipe 26, the jet directions of the plurality of upper backflow sprayers 13, the jet directions of the plurality of lower backflow sprayers 12 and the jet directions of the plurality of external circulation water inlet sprayers 29 are the same and all along the secant direction of the cross section of the tank body 1; the jet flow direction of the horizontal pipe at the upper end of the gas collecting pipe 14 is along the secant direction of the cross section of the gas-water separator 2.
Further, the lower reflux nozzle 12 is respectively arranged at the parts of the pipe arms of the first cross pipe in the internal rotation mixing area 32, the middle rotation mixing area 33 and the external rotation mixing area 34; the outer circulation water inlet spray heads 29 are respectively arranged on the parts of the pipe arms of the second cross pipe, which are positioned in the inner rotation mixing area 32, the middle rotation mixing area 33 and the outer rotation mixing area 34.
Further, the aeration system 5 is any one of a membrane aerator, a rotary mixing aerator or an aeration pipe; the decanter 3 is a pontoon type decanter or other liftable decanter; the bottom of the gas-water separator 2 is conical with the small diameter end at the lower part.
Further, the number of the inner guide plates 30 and the middle guide plates 31 is not less than 2, the arc length of each inner guide plate 30 and each middle guide plate 31 is not more than 1/4 circumference, each inner guide plate 30 is uniformly distributed on the circumference, each middle guide plate 31 is also uniformly distributed on the circumference, and the inner guide plates 30 and the middle guide plates 31 are staggered.
Further, the first cross pipe and the second cross pipe are arranged in a crossing way, the inner guide plate 30 is arranged at the bottom of the tank, and the middle guide plate 31 is fixed at the bottom of the tank through supporting legs.
The working method of the aerobic granular sludge continuous flow type reactor,
when in operation, the system is divided into four stages of water inlet, aeration, precipitation and drainage, and the sequencing batch is repeatedly operated;
(1) Raw water enters the water distribution mixing zone 7 from a water inlet pipe 26 through a water inlet pipe control valve 25 in the water inlet stage; starting an outer circulation pump system 20, opening a circulation control valve 21, a pipeline ejector water inlet valve 23 and a pipeline ejector water outlet valve 24, enabling circulating water and air to enter from an outer circulation water inlet nozzle 29 of the water distribution mixing zone 7, enabling the circulating water and the air to tangentially flow by an inner guide plate 30, a middle guide plate 30 and the tank wall of the tank body 1 to form rotation and mix with inlet water, gradually rising to a nitrification zone 8 through a denitrification zone 9, completing water inlet work after reaching a set water level, and stopping the outer circulation pump 20;
(2) Starting an aeration system 5, forming density difference between the gas, liquid and solid mixture in the gas collecting hood 4 and the gas-water separator 2, lifting to the top of the gas collecting hood, refluxing a part of the gas, liquid and solid mixture to the outside of the gas collecting hood 4 through an upper reflux pipe 11, injecting the mixture through an upper reflux nozzle 13, forming rotary mixing, sinking into the gas collecting hood 4, and lifting again to form upper circulation; the other part of the gas, liquid and solid mixture flows back to the bottom of the tank body 1 through the lower return pipe 10 and is ejected by the lower return nozzle 12, is tangentially and rotationally mixed by the inner guide plate 30, the middle guide plate 30 and the cylinder wall of the tank body 1 to form a guide flow, rises into the gas collecting hood 4, and is lifted again to form a large circulation; the discharged water enters the sedimentation zone 3, sludge is choked by the inclined plate 43 and falls down to enter the gas collecting hood 4 again, and clear liquid overflows from the top of the inclined plate 43 and enters the water outlet weir 44 to realize continuous flow type discharged water; the control system 6 adjusts the aeration system 5 and the external circulation pump system 20 to run in an alternating mode according to the feedback data of the dissolved oxygen probe 35 of the denitrification region and the dissolved oxygen probe 36 of the nitrification region, and the aeration stage is completed after the set time or the requirement of the treated water quality is reached;
(3) The sedimentation stage and the drainage stage are entered, the decanter 2 can drain water simultaneously along with the sedimentation, one period is completed when the set drainage level is reached, and the sequencing batch circulation work of the water inlet stage can be entered again.
According to the working method of the aerobic granular sludge continuous flow type reactor, an aeration system 5 intermittently works or continuously works according to feedback data of a dissolved oxygen probe 36 of a nitrifying zone and a dissolved oxygen probe 35 of a denitrifying zone, dissolved oxygen of the nitrifying zone 8 is controlled to be 0.8-2.0mg/L, dissolved oxygen of the denitrifying zone 9 is controlled to be 0.5-0.8mg/L, a lower return pipe control valve 16 is used for adjusting 20-70% of reflux quantity of the gas-water separator 2 to enter a water distribution mixing zone 6 of the denitrifying zone 9, and an upper return pipe control valve 17 is used for adjusting 30-80% of reflux quantity of the gas-water separator 2 to enter an upper return nozzle 13 of the nitrifying zone 8 to be ejected.
Example 2
One side of the inclined plate 39 is fixed on the tank wall, the other side of the inclined plate 39 is fixed on the annular water baffle 41, and the plane of the inclined plate 39 is not overlapped with the longitudinal section of the cylindrical tank body.
A water passing channel with a distance of 15-45 cm is arranged between the large diameter end of the conical mud return plate 38 and the pipe wall 1.
The water outlet weirs 40 are uniformly distributed radially by taking the axis of the tank body as the center, one end of each water outlet weir is fixed on the tank wall, the other end of each water outlet weir is fixed on the annular water baffle 41, and the water outlet weirs 40 are connected through a pipeline.
The height-diameter ratio of the tank body 1 is 1:1-4:1; the nitrifying zone 8 is from the upper part of the aeration system 5 to the top of the tank and occupies 1/2-2/3 of the height of the tank body 1; the denitrification zone 8 is from the lower part of the aeration system 5 to the bottom of the tank and occupies 1/3-1/2 of the height of the tank body 1.
Both the tank 1 and the gas-water separator 2 are columnar.
The water inlet pipe 26 enters the tank body 1 to 30-50 cm along the tangential direction of the tank wall of the tank body 1
The number of the upper reflux spray heads 13 is more than or equal to 3 groups and are uniformly arranged.
The gas-collecting hood 4 is in a cone shape with a large diameter end of 30-65 degrees at the lower small diameter end and an upper small diameter end, and the edge of the large diameter end of the gas-collecting hood 4 is 20-50 cm away from the cylinder wall of the tank body 1.
The first cross pipe and the second cross pipe are arranged in a 45-degree crossing way, the pipe wall of the first cross pipe and the pipe wall of the second cross pipe are uniformly arranged at intervals, the inner guide plate 30 is arranged at the bottom of the tank, the height is 30-150 cm, the gap between the middle guide plate 31 and the bottom of the tank is 30-100 cm, and the height is 30-150 cm.
The second cross pipe is positioned above the first cross pipe, the second cross pipe is 50-150 cm away from the tank bottom, and the first cross pipe is 30-80 cm away from the tank bottom.
The inner deflector 30 and the middle deflector 31 are staggered; meaning that the connection line between the arc midpoint of the inner deflector 30 and the center of the circle is not coincident with the connection line between the arc midpoint of the inner deflector 31 and the center of the circle; the optimal connection line between the arc midpoint of the inner guide plate 30 and the center of the circle is uniformly spaced from the connection line between the arc midpoint of the middle guide plate 31 and the center of the circle.
The diameter of the small diameter end of the conical return mud plate 18 is the same as the diameter of the annular water baffle 41.
The external circulation pump 20 sucks air from the gas collecting hood 4 of the nitrifying zone 8 through the pipeline jet device 27 on the external circulation pipe 37, and then the air is directly ejected by the external circulation water inlet nozzle 29 to enter the water distribution mixing zone 6 to form external circulation work.
Claims (4)
1. The aerobic granular sludge continuous flow type reactor is characterized by comprising a tank body, an aeration system, a water inlet pipe, a gas-water separator, an upper return pipe, an upper return nozzle, a lower return pipe, a first cross pipe, a lower return nozzle, a gas collecting hood, a gas collecting pipe, a decanter, a drain pipe, an outer circulation pump, a pipeline jet device, a twenty-first pipe, an inner guide plate, a middle guide plate, a conical mud returning plate, an inclined plate, a water outlet weir and an annular water baffle;
the annular water baffle is concentrically arranged at the upper end of the interior of the tank body, and an annular area between the annular water baffle and the tank body is a sedimentation area; the aerator system is arranged in the tank body, and a nitrifying area is arranged between the upper part of the aerator system and the inside of the annular water baffle; a denitrification region is arranged below the aerator system, and a space from the lower part of the denitrification region to the bottom of the tank is a water distribution mixing region;
the gas-water separator is arranged at the top of the tank body, one end of the upper return pipe is connected to the bottom of the gas-water separator, and the other end of the upper return pipe is positioned in the nitrifying zone and is provided with a plurality of upper return spray heads; one end of a lower return pipe is connected to the bottom of the gas-water separator, the other end of the lower return pipe is connected to a first cross pipe, and a plurality of lower return spray heads are arranged on the first cross pipe;
the gas collecting hood is arranged above the aerator system, the lower end of the gas collecting pipe is connected with the cone top of the gas collecting hood, and the upper end of the gas collecting pipe is connected with the gas-water separator through a horizontal pipe;
one end of the outer circulating pipe is arranged above the gas collecting cover of the nitrifying zone in the tank body, the other end of the outer circulating pipe sequentially passes through the outer circulating pump and the pipeline jet device and is connected to the second cross pipe through one way of the three-way pipe, the other way of the three-way pipe is connected with the mud discharging pipe, and a plurality of outer circulating water inlet nozzles are arranged on the second cross pipe;
the inner guide plate and the middle guide plate are circular arcs concentric with the tank body, and the inner guide plate and the middle guide plate divide the water distribution mixing region into an inner rotation mixing region, a middle rotation mixing region and an outer rotation mixing region from the center of the tank body outwards in sequence;
the small diameter end of the conical mud returning plate is fixedly connected with the lower end of the annular water blocking plate, the large diameter end of the conical mud returning plate is arranged below, a water passing channel is arranged between the large diameter end of the conical mud returning plate and the pipe wall, a plurality of inclined plates are arranged above the conical mud returning plate in the sedimentation area, a plurality of water outlet weirs are arranged above the inclined plates, each water outlet weir is groove-shaped, each water outlet weir is arranged along the diameter direction of the tank body, one end of a drain pipe is connected to the water outlet weir, and the other end of the drain pipe is connected to the outside of the tank body;
the water inlet pipe is arranged in the water distribution mixing area of the tank body,
the system also comprises a gas collecting tube control valve, a lower return tube control valve, an upper return tube control valve, a drain valve, an aeration control valve, a circulation control valve, a mud discharging valve, a pipeline ejector water inlet valve, a pipeline ejector water outlet valve, a water inlet pipe control valve, a denitrification zone dissolved oxygen probe, a nitrification zone dissolved oxygen probe and a control system;
the gas collecting pipe control valve is arranged on the gas collecting pipe, the lower return pipe control valve is arranged on the lower return pipe, the upper return pipe control valve is arranged on the upper return pipe, the drain valve is arranged on the drain pipe, the aeration control valve is arranged on the aeration system, the circulation control valve is arranged on the outer circulation pipe, the mud valve is arranged on the mud pipe, the inlet valve of the pipeline jet device is arranged on the inlet of the pipeline jet device, the outlet valve of the pipeline jet device is arranged on the outlet of the pipeline jet device, the inlet pipe control valve is arranged on the inlet pipe, the dissolved oxygen probe of the denitrification zone is arranged in the denitrification zone, the dissolved oxygen probe of the nitrification zone is arranged in the nitrification zone,
the system also comprises a control system, an external circulation pump system, a gas collecting tube control valve, a lower return tube control valve, an upper return tube control valve, a drain valve, an aeration control valve, a circulation control valve, a mud valve, a pipeline ejector water inlet valve, a pipeline ejector water outlet valve, a water inlet tube control valve, a denitrification zone dissolved oxygen probe and a nitrification zone dissolved oxygen probe are all connected with the control system to realize automatic control work;
the jet direction of the water inlet pipe, the jet directions of the upper reflux spray heads, the jet directions of the lower reflux spray heads and the jet directions of the outer circulation water inlet spray heads are the same and all along the secant direction of the cross section of the tank body; the jet flow direction of the horizontal pipe at the upper end of the gas collecting pipe is along the cutting line direction of the cross section of the gas-water separator;
the parts of the pipe arms of the first cross pipe, which are positioned in the internal rotation mixing area, the middle rotation mixing area and the external rotation mixing area, are respectively provided with lower reflux spray heads; the parts of the pipe arms of the twenty-first pipe, which are positioned in the internal rotation mixing area, the middle rotation mixing area and the external rotation mixing area, are respectively provided with an external circulation water inlet nozzle;
the number of the inner guide plates and the middle guide plates is more than or equal to 2, the arc length of each inner guide plate and each middle guide plate is less than or equal to 1/4 circumference, each inner guide plate is uniformly distributed on the circumference, each middle guide plate is also uniformly distributed on the circumference, and the inner guide plates and the middle guide plates are staggered.
2. The aerobic granular sludge continuous flow reactor as claimed in claim 1 wherein the aeration system is any one of a membrane aerator or a spin-mixing aerator or an aeration pipe; the decanter is a pontoon type decanter or other liftable decanters; the bottom of the gas-water separator is conical with the small diameter end at the lower part.
3. The aerobic granular sludge continuous flow reactor according to claim 1, wherein the first cross pipe and the second cross pipe are arranged in a crossing manner, the inner deflector is arranged at the bottom of the tank, and the middle deflector is fixed at the bottom of the tank through supporting legs.
4. The method for operating a continuous flow reactor for aerobic granular sludge according to claim 1,
when in operation, the system is divided into four stages of water inlet, aeration, precipitation and drainage, and the sequencing batch is repeatedly operated;
(1) Raw water enters a water distribution mixing area from a water inlet pipe through a water inlet pipe control valve in the water inlet stage; starting an external circulation pump system, opening a circulation control valve, a pipeline ejector water inlet valve and a pipeline ejector water outlet valve, enabling circulating water and air to enter from an external circulation water inlet nozzle of a water distribution mixing region, enabling the circulating water and the air to tangentially flow into a guide flow by a tank wall of an inner guide plate, a middle guide plate and a tank body to rotate and mix with the inlet water, gradually rising to a nitrification region through a denitrification region, completing water inlet work after reaching a set water level, and stopping an external circulation pump;
(2) Starting an aeration system, forming density difference between the gas, liquid and solid mixture in the gas collecting hood and the gas-water separator, lifting to the top of the gas collecting hood, refluxing a part of the gas, liquid and solid mixture to the outside of the gas collecting hood through an upper reflux pipe, injecting the mixture through an upper reflux nozzle, forming rotary mixing and sinking into the gas collecting hood, and lifting again to form upper circulation; the other part of the gas, liquid and solid mixture flows back to the bottom of the tank body through a lower return pipe and is ejected by a lower return nozzle, and is tangentially and rotationally mixed by the inner guide plate, the middle guide plate and the wall of the tank body to form a rotary mixing flow, and rises to enter the gas collecting hood, and is lifted again to form a large circulation; the external drainage enters a sedimentation zone, sludge is choked by an inclined plate and sinks to enter a gas collecting hood again, and clear liquid overflows from the top of the inclined plate and enters an effluent weir to realize continuous flow type external drainage; the control system adjusts the aeration system and the external circulation pump system to run in an alternating mode according to the feedback data of the dissolved oxygen probe in the denitrification zone and the dissolved oxygen probe in the nitrification zone, and the aeration stage is completed after the set time or the requirement of water quality treatment is reached;
(3) Entering a precipitation stage and a drainage stage, draining water simultaneously by the decanter along with precipitation, completing a period when reaching a set drainage level, entering a water inlet stage again for sequencing batch cycle operation,
the aeration system intermittently or continuously works according to feedback data of the dissolved oxygen probe of the nitrifying zone and the dissolved oxygen probe of the denitrifying zone, the dissolved oxygen of the nitrifying zone is controlled to be 0.8-2.0mg/L, the dissolved oxygen of the denitrifying zone is controlled to be 0.5-0.8mg/L, a lower return pipe control valve is used for adjusting 20-70% of the reflux quantity of the gas-water separator to enter a water distribution mixing zone of the denitrifying zone, and an upper return pipe control valve is used for adjusting 30-80% of the reflux quantity of the gas-water separator to enter an upper return nozzle of the nitrifying zone for ejection.
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