CN113304684A - Continuous flow aerobic granular sludge reaction device and method with inner sleeve - Google Patents
Continuous flow aerobic granular sludge reaction device and method with inner sleeve Download PDFInfo
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- CN113304684A CN113304684A CN202110612186.6A CN202110612186A CN113304684A CN 113304684 A CN113304684 A CN 113304684A CN 202110612186 A CN202110612186 A CN 202110612186A CN 113304684 A CN113304684 A CN 113304684A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
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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
- C02F11/00—Treatment of sludge; Devices therefor
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- 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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a continuous flow aerobic granular sludge reaction device with an inner sleeve and a method, belonging to the technical field of biological sewage treatment. The device comprises a water inlet unit, a reaction main body unit, a precipitation-sludge backflow unit and a water outlet unit; an inner sleeve is coaxially sleeved in the reactor main body of the reaction main body unit, an aeration device is arranged at the bottom in the reactor main body, and a water inlet is formed in the lower part of the reactor main body and is communicated with the water outlet end of the water inlet pipe; the inner sleeve is a hollow cylindrical structure with an upper part and a lower part closed, and a plurality of through holes are uniformly formed in the side wall of the inner sleeve; the inner sleeve is externally connected with a power device which can drive the inner sleeve to rotate by taking the axis as a rotating shaft, so that the inner sleeve can rotate in the reactor main body and does not interfere with the inner wall of the reactor main body. The invention can realize aerobic sludge granulation under the continuous flow operation condition, effectively shortens sludge granulation time, ensures that the formed granular sludge has uniform particle size distribution and compact structure, and solves the problems of long particle starting period, unstable structure and the like of the conventional continuous flow aerobic granular sludge.
Description
Technical Field
The invention relates to a continuous flow aerobic granular sludge reaction device with an inner sleeve and a method, belonging to the technical field of biological sewage treatment.
Background
The aerobic granular sludge is an aggregate with a special structure formed by microorganisms under the self-aggregation action, and the compact aggregation structure and the larger particle size of the aerobic granular sludge can form an internal step dissolved oxygen environment, so that the aerobic granular sludge is beneficial to the partition colonization of functional interoperable microorganisms, the biomass retention and the sedimentation performance improvement, and has obvious technical advantages in the aspects of strengthening the composite pollution removal, reducing the occupied area of a system, saving the energy consumption and the drug consumption in operation and the like. At present, a great deal of research is carried out in the aspects of granulation mechanism analysis, process parameter optimization, functional flora analysis and the like abroad. The Nereda process based on aerobic granular sludge pilot-scale technology is introduced from the Netherlands Delft science and engineering university in 2005, and more than 70 Nereda process sewage treatment plants are operated globally or under construction and are a promising sewage biological treatment technology.
At present, continuous flow aerobic granular sludge reactors are receiving more and more attention from researchers due to simple operation and large sewage treatment capacity. However, the problems of long start-up time and unstable operation of the continuous flow reactor generally exist, which restricts the popularization and application of the continuous flow aerobic granular sludge technology. Therefore, the research and development of the novel aerobic sludge granulation device with the inner sleeve and the method thereof utilize the water flow swirling flow state provided by the inner sleeve to provide speed selection pressure, shorten the starting time of the aerobic granular sludge, and have very important practical application significance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a continuous flow aerobic granular sludge reaction device and a continuous flow aerobic granular sludge reaction method with an inner sleeve. Through optimizing the configuration of device, increase the inner skleeve and provide hydraulic shear force for the inner member of reaction main unit, increase simultaneously and deposit the unit, ensure the long-term steady operation of good oxygen granule sludge reactor.
The invention adopts the following specific technical scheme:
in a first aspect, the invention provides a continuous flow aerobic granular sludge reaction device provided with an inner sleeve, which comprises a water inlet unit, a reaction main body unit, a precipitation-sludge backflow unit and a water outlet unit;
the water inlet unit comprises a water inlet container, a submersible pump and a water inlet pipe, and the submersible pump is arranged below the liquid level of the water inlet container and is connected with the water inlet end of the water inlet pipe; the reaction main body unit comprises a reactor main body, an inner sleeve and an aeration device; an inner sleeve is coaxially sleeved in the reactor main body, an aeration device is arranged at the bottom in the reactor main body, and a water inlet is formed in the lower part of the reactor main body and is communicated with the water outlet end of the water inlet pipe; the inner sleeve is a hollow cylindrical structure with an upper part and a lower part closed, and a plurality of through holes are uniformly formed in the side wall of the inner sleeve; the inner sleeve is externally connected with a power device which can drive the inner sleeve to rotate by taking the axis as a rotating shaft, so that the inner sleeve can rotate in the reactor main body and does not interfere with the inner wall of the reactor main body;
the sedimentation-sludge backflow unit comprises a sedimentation-backflow reactor and an electromagnetic valve; the upper part of the reactor main body is communicated with a liquid inlet of the precipitation-reflux reactor through a water outlet pipe provided with a filtering device, and the bottom of the precipitation-reflux reactor is provided with a reflux port; the reflux opening is provided with an electromagnetic valve which can control the reflux quantity and is communicated with the bottom of the reactor main body through a sludge reflux pipe; a liquid outlet communicated with the water outlet unit is arranged on the side wall above the liquid inlet of the sedimentation-reflux reactor.
Preferably, the water inlet container is a water inlet barrel.
Preferably, the reactor body and the inner sleeve are both cylindrical in configuration and have an effective volume ratio of 3: 1.
Preferably, the filtering device is a filter screen with a pore size of 200 microns.
Preferably, the height-diameter ratio of the reactor main body is 4 to 10.
Preferably, the aeration device is an aeration head externally connected with an air pump for providing oxygen.
Preferably, the water outlet unit comprises a liquid outlet pipe and a water outlet container; one end of the liquid outlet pipe is communicated with the liquid outlet, and the other end of the liquid outlet pipe is communicated with the water outlet container.
Preferably, a plurality of sampling ports are arranged on the side walls of the reactor main body and the sedimentation-reflux reactor along the length direction.
Preferably, the bottom of the precipitation-reflux reactor is of a tapered conical structure.
In a second aspect, the present invention provides an aerobic sludge granulation method using the continuous flow aerobic granular sludge reactor in any one of the first aspect, specifically comprising:
inoculating activated sludge to be granulated in the aerobic bioreactor, storing organic wastewater to be treated in a liquid storage device, and allowing the organic wastewater to enter the aerobic bioreactor through a water inlet;
the power device is operated to drive the inner sleeve to rotate in the reactor main body, so that the mud-water mixture in the reactor main body flows in a rotational flow manner, and meanwhile, a sufficient hydraulic shearing force is provided for the sludge granulation process; oxygen is conveyed into the reactor main body through the aeration device, so that sufficient dissolved oxygen is provided for the microorganisms to consume organic matters; the organic wastewater fully reacted by the reactor main body flows out of a water outlet of the reactor main body, is filtered by a filtering device and then enters a precipitation-reflux reactor, and the filtering device intercepts part of sludge in the water body in the reactor main body and maintains the biomass required by the reaction in the reactor main body; settling organic wastewater in the sedimentation-reflux reactor, settling sludge carried in water to the bottom of the sedimentation-reflux reactor under the action of gravity, and opening the electromagnetic valve when the volume of the settled sludge exceeds a set value so as to enable the sludge to flow back to the interior of the reactor main body through the sludge return pipe; the organic wastewater in the precipitation-reflux reactor enters the water outlet unit from the liquid outlet.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the inner sleeve is added to the structure of the reactor main body unit to form an inner structure, so that the configuration of the reactor is optimized, the sludge granulation can be accelerated, and the sludge starting time is shortened;
(2) the invention ensures the rapid granulation and long-term stable operation of the sludge by increasing the internal sleeve to construct a structure matched with the precipitation-reflux unit, the filtering device and the like, overcomes the problems of long starting time and unstable operation of the traditional continuous flow aerobic granular sludge, and simultaneously has higher pollutant removal efficiency (COD and NH) of the reactor4 +The removal rates of-N and TN are respectively maintained to be more than 95%, 90% and 80%), and the method has very important practical significance in actual sewage treatment;
(3) the aerobic granular sludge cultured by the invention has the average volume particle size of 0.2mm and compact granular structure.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 shows the particle size growth of the particles in the examples;
FIG. 3 is an SEM image of the granular sludge operating for 15 days in the examples;
the reference numbers in the figures are: the device comprises a water inlet container 1, a water inlet 2, a submersible pump 3, a reactor main body 4, a power device 5, an inner sleeve 6, an air pump 7, an aeration device 8, a filtering device 9, a sedimentation-reflux reactor 10, an electromagnetic valve 11, a liquid outlet 12 and a water outlet container 13.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and the detailed description. The technical features of the embodiments of the present invention can be combined correspondingly without mutual conflict.
As shown in fig. 1, the continuous flow aerobic granular sludge reactor provided with an inner sleeve according to the present invention mainly comprises a water inlet unit, a reaction main unit, a sedimentation-sludge return unit and a water outlet unit. The structure and connection of each unit will be specifically described below.
The water inlet unit comprises a water inlet container 1, a submersible pump 3 and a water inlet pipe. The water inlet container 1 can adopt a water inlet bucket for containing organic wastewater to be treated. The submersible pump 3 is arranged below the liquid level of the water inlet container 1 and is connected with the water inlet end of the water inlet pipe, and can suck the organic wastewater in the water inlet container 1 into the water inlet pipe.
The reaction main unit includes a reactor main body 4, an inner sleeve 6, and an aeration device 8. The reactor body 4 is provided with a hollow cavity, the lower part of the reactor body is provided with a water inlet 2, and the water outlet end of the water inlet pipe is communicated with the water inlet 2. The height-diameter ratio of the reactor main body 4 can be 4-10. An inner sleeve 6 is coaxially sleeved inside the reactor main body 4, the inner sleeve 6 is a hollow cylindrical structure which is closed up and down, and a plurality of through holes are uniformly formed in the side wall of the inner sleeve. The inner sleeve 6 is externally connected to a power unit 5 which can rotate the inner sleeve 6 about the axis as a rotation axis, so that the inner sleeve 6 can rotate inside the reactor main body 4 without interfering with the inner wall of the reactor main body 4. In practical application, both the reactor main body 4 and the inner sleeve 6 can be set to be cylindrical structures, and the effective volume ratio of the reactor main body 4 to the inner sleeve 6 can be set to be 3:1, so that the inner sleeve 6 can fully stir the muddy water mixture in the reactor main body 4 and form a rotational flow state, and granulation of granular sludge is facilitated. An aeration device 8 is arranged at the inner bottom of the reactor main body 4, the aeration device 8 can adopt an aeration head, and the aeration device 8 is externally connected with an air pump 7 for providing oxygen.
The sedimentation-sludge recirculation unit comprises a sedimentation-recirculation reactor 10 and a solenoid valve 11. The upper part of the reactor main body 4 is communicated with the liquid inlet of the sedimentation-reflux reactor 10 through a water outlet pipe provided with a filtering device 9, and the filtering device 9 can adopt a filter screen with 200 micron pore size, so that large-particle sludge in water can be trapped in the reactor main body 4. The bottom of the sedimentation-reflux reactor 10 is provided with a reflux port, the reflux port is provided with an electromagnetic valve 11 which can control the reflux quantity, and the reflux port is communicated with the bottom of the reactor main body 4 through a sludge reflux pipe. The side wall above the liquid inlet of the sedimentation-reflux reactor 10 is provided with a liquid outlet 12 communicated with the water outlet unit. The bottom of the settling-reflux reactor 10 may be provided as a tapered conical structure.
The water outlet unit comprises a liquid outlet pipe and a water outlet container 13. One end of the liquid outlet pipe is communicated with the liquid outlet 12, and the other end is communicated with the water outlet container 13.
In order to observe the sewage treatment condition in each region of the reactor body 4 and the precipitation-reflux reactor 10, a plurality of sampling ports may be formed on the side walls of the reactor body 4 and the precipitation-reflux reactor 10 along the length direction. For example, water inlets may be provided at the lower part, the middle part and the upper part of the reactor body 4, respectively, so as to periodically sample and observe the sewage treatment effect in the lower, middle and upper regions of the reactor body 4.
The method for culturing aerobic granular sludge and treating organic wastewater by using the continuous flow aerobic granular sludge reaction device comprises the following specific steps:
inoculating activated sludge to be granulated with certain concentration in the aerobic bioreactor 4, storing organic wastewater to be treated in the liquid storage device 1, and allowing the organic wastewater to enter the aerobic bioreactor 4 through the water inlet 3. In practical application, if only the aerobic granular sludge is granulated, an organic matter solution can be prepared and placed in the liquid storage device 1; if it is desired to achieve both granulation and treatment of the organic wastewater, the organic wastewater to be treated may be placed in the liquid storage device 1.
The power device 5 is operated to drive the inner sleeve 6 to rotate in the reactor main body 4, so that the mud-water mixture in the reactor main body 4 flows in a rotational flow manner, and meanwhile, a sufficient hydraulic shearing force is provided for the sludge granulation process. Oxygen is delivered into the reactor body 4 through the aeration device 19 to provide sufficient dissolved oxygen for the microorganisms to consume the organic matter. The organic wastewater fully reacted by the reactor main body 4 flows out of a water outlet of the reactor main body 4, is filtered by the filtering device 9 and then enters the precipitation-reflux reactor 10, and the filtering device 9 intercepts part of sludge in the water body in the reactor main body 4 to maintain the biomass required by the reaction in the reactor main body 4. The organic wastewater is settled in the sedimentation-reflux reactor 10, the sludge carried in the water is settled to the bottom of the sedimentation-reflux reactor 10 under the action of gravity, when the volume of the settled sludge exceeds a set value, the electromagnetic valve 15 is opened, and the sludge which grows compactly flows back to the interior of the reactor main body 4 through the sludge reflux pipe. The organic wastewater in the precipitation-reflux reactor 10 enters the effluent unit from the effluent outlet 12.
Because the effluent quality of the aerobic sludge granulation process has the requirement of continuously adjusting the sludge reflux volume, the device can effectively meet the requirement; meanwhile, the sewage treatment capacity and operability are greatly improved in a mode that the device can run continuously.
Examples
In this embodiment, the structure of the continuous flow aerobic granular sludge reactor is as above, and will not be described herein. The specific parameters involved are as follows: the reactor main body 4 adopts a cylindrical hollow organic glass cylinder, the effective volume is 3L, the effective height in the cylinder is 50cm, the inner diameter is 10cm, and the height-diameter ratio is 5: 1; the effective volume of the precipitation-reflux reactor 10 was 1L, the upper part was cylindrical, the lower part was tapered, the effective height was 20cm, the internal diameter was 10cm, and the cone height was 5 cm. Inoculating sludge is taken from return sludge of a certain domestic sewage treatment plant, and the concentration of the inoculating sludge is 4000 mg/L; the organic wastewater is prepared urban domestic sewage.
The operation process of treating town sewage and culturing aerobic granular sludge by adopting the reactor is as follows: the reactor adopts a continuous flow operation mode, and an aeration head at the bottom of a main body unit of the reactor provides oxygen of 7 mg/L. When the reactor is operated, about 4000mg/L of activated sludge is inoculated to the main body unit of the reactor. The prepared urban domestic sewage is pumped in from the water inlet barrel by the submersible pump, after the operation for a period of time, the sludge amount rises to some extent, and the pollutant removal efficiency is stable. As shown in FIG. 3, the particle size of the granules is significantly larger than 200 μm after 20 days of operation, and the granulation effect is significant.
As shown in FIG. 3, the aerobic granular sludge cultured in this example had a large average particle size, and the formed granular sludge had a dense structure and a smooth surface. The problems that an aerobic granular sludge reactor operating under the continuous flow condition is long in starting time and easy to destabilize in operation are solved, the formed granular sludge is compact in structure and approximately spherical in shape, the granulating time is shortened by about 10 days, and the method has very important practical significance in sewage treatment.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.
Claims (10)
1. A continuous flow aerobic granular sludge reaction device provided with an inner sleeve is characterized by comprising a water inlet unit, a reaction main body unit, a precipitation-sludge backflow unit and a water outlet unit;
the water inlet unit comprises a water inlet container (1), a submersible pump (3) and a water inlet pipe, wherein the submersible pump (3) is arranged below the liquid level of the water inlet container (1) and is connected with the water inlet end of the water inlet pipe; the reaction main unit comprises a reactor main body (4), an inner sleeve (6) and an aeration device (8); an inner sleeve (6) is coaxially sleeved in the reactor main body (4), an aeration device (8) is arranged at the bottom in the reactor main body, and a water inlet (2) is formed in the lower part of the reactor main body and communicated with the water outlet end of the water inlet pipe; the inner sleeve (6) is a hollow cylindrical structure with an upper closed end and a lower closed end, and a plurality of through holes are uniformly formed in the side wall of the inner sleeve; the inner sleeve (6) is externally connected with a power device (5) which can drive the inner sleeve to rotate by taking the axis as a rotating shaft, so that the inner sleeve (6) can rotate in the reactor main body (4) and does not interfere with the inner wall of the reactor main body (4);
the sedimentation-sludge backflow unit comprises a sedimentation-backflow reactor (10) and an electromagnetic valve (11); the upper part of the reactor main body (4) is communicated with a liquid inlet of the precipitation-reflux reactor (10) through a water outlet pipe provided with a filtering device (9), and the bottom of the precipitation-reflux reactor (10) is provided with a reflux port; an electromagnetic valve (11) capable of controlling the reflux quantity is arranged at the reflux opening and is communicated with the bottom of the reactor main body (4) through a sludge reflux pipe; a liquid outlet (12) communicated with the water outlet unit is arranged on the side wall above the liquid inlet of the sedimentation-reflux reactor (10).
2. A continuous-flow aerobic granular sludge reactor according to claim 1, wherein said water inlet vessel (1) is a water inlet tank.
3. A continuous-flow aerobic granular sludge reactor according to claim 1, wherein the reactor body (4) and the inner sleeve (6) are both of cylindrical configuration with an effective volume ratio of 3: 1.
4. A continuous-flow aerobic granular sludge reactor according to claim 1, wherein said filtering means (9) is a 200 micron pore size sieve.
5. The continuous-flow aerobic granular sludge reactor according to claim 1, wherein the height to diameter ratio of the reactor body (4) is 4-10.
6. A continuous-flow aerobic granular sludge reactor according to claim 1, wherein said aeration means (8) is an aeration head externally connected to an air pump (7) for providing oxygen.
7. A continuous-flow aerobic granular sludge reactor according to claim 1, wherein said effluent unit comprises an effluent pipe and an effluent container (13); one end of the liquid outlet pipe is communicated with the liquid outlet (12), and the other end is communicated with the water outlet container (13).
8. The continuous-flow aerobic granular sludge reactor according to claim 1, wherein the side walls of the reactor body (4) and the sedimentation-reflux reactor (10) are provided with a plurality of sampling ports along the length direction.
9. A continuous-flow aerobic granular sludge reactor according to claim 1, wherein the bottom of the sedimentation-reflux reactor (10) is of a tapered conical structure.
10. A method for culturing aerobic granular sludge and treating organic wastewater by using the continuous flow aerobic granular sludge reaction device as claimed in any one of claims 1 to 9, which is characterized by comprising the following steps:
inoculating activated sludge to be granulated in the aerobic bioreactor (4), storing organic wastewater to be treated in a liquid storage device (1), and allowing the organic wastewater to enter the aerobic bioreactor (4) through a water inlet (3);
the power device (5) is operated to drive the inner sleeve (6) to rotate in the reactor main body (4), so that the mud-water mixture in the reactor main body (4) flows in a rotational flow manner, and meanwhile, a sufficient hydraulic shearing force is provided for the sludge granulation process; oxygen is conveyed into the reactor main body (4) through an aeration device (19) to provide sufficient dissolved oxygen for the microorganisms to consume organic matters; the organic wastewater fully reacted by the reactor main body (4) flows out of a water outlet of the reactor main body (4), is filtered by a filtering device (9) and then enters a precipitation-reflux reactor (10), and the filtering device (9) intercepts part of sludge in the water body in the reactor main body (4) to maintain the biomass required by the reaction in the reactor main body (4); the organic wastewater is settled in the settling-refluxing reactor (10), the sludge carried in the water is settled to the bottom of the settling-refluxing reactor (10) under the action of gravity, and when the volume of the settled sludge exceeds a set value, the electromagnetic valve (15) is opened, and the sludge is refluxed into the reactor main body (4) through the sludge reflux pipe; the organic wastewater in the precipitation-reflux reactor (10) enters the water outlet unit from the liquid outlet (12).
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| CN114988565A (en) * | 2022-06-21 | 2022-09-02 | 华东理工大学 | Gravity-driven rotational flow enhanced continuous flow aerobic activated sludge granulation device and method |
| CN115072863A (en) * | 2022-07-07 | 2022-09-20 | 兰州交通大学 | Uniform water distribution device and method for aerobic granular sludge forming |
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