CN107601656B - Device for rapidly culturing aerobic granular sludge secondary flow air-stripping fluidized bed by granulating granular sludge - Google Patents

Device for rapidly culturing aerobic granular sludge secondary flow air-stripping fluidized bed by granulating granular sludge Download PDF

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CN107601656B
CN107601656B CN201710950510.9A CN201710950510A CN107601656B CN 107601656 B CN107601656 B CN 107601656B CN 201710950510 A CN201710950510 A CN 201710950510A CN 107601656 B CN107601656 B CN 107601656B
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sludge
fluidization
granular sludge
water
aeration
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CN107601656A (en
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易诚
邓景衡
湛含辉
龙九妹
罗远来
王晶
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Hengyang Normal University
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a continuous secondary flow coagulation gas stripping fluidized bed reactor for continuously culturing aerobic granular sludge and treating sewage, wherein the main body part of the reactor is made of inner and outer cylindrical organic glass and comprises four regions including a fluidization region (14), a water particle separation region (20), a reflux chamber (13) and a settling region (2). The granulation granular sludge is utilized, the secondary flow gas stripping fluidized bed provided by the invention is adopted, the granular sludge is rapidly cultured, the formation time of aerobic granular sludge is greatly shortened, a good sewage treatment effect is achieved in the aerobic culture process of the granulation granular sludge, the purposes of culturing and treating are realized, and the time required by starting the granular sludge is shortened.

Description

Device for rapidly culturing aerobic granular sludge secondary flow air-stripping fluidized bed by granulating granular sludge
Technical Field
The invention belongs to the fields of environmental protection and sewage treatment, and particularly relates to a device and a method for rapidly culturing aerobic granular sludge by using granulated granular sludge.
Background
Along with the acceleration of urbanization in China, the generation amount of urban sewage is correspondingly increased, for example, the total amount of discharged wastewater in 2015 is 695.4 hundred million tons, wherein the discharged amount of industrial wastewater is 209.8 million tons and only accounts for 30.2%, and the discharged amount of domestic sewage in cities and towns is 485.1 million tons and accounts for 69.8%. The ' thirteen-five ' national urban sewage treatment and recycling facility construction plan ' is put forward to the end of 2020, realizing the full coverage of urban sewage treatment facilities, and the urban sewage treatment rate is 95%. Meanwhile, due to the rapid development of modern industry, large-area pollution of water resources is caused, and the treatment and recycling technology of water pollution becomes the bottleneck of rapid development of modern industry. Different aerobic activated sludge methods are mainly adopted for treating the urban sewage plant and the industrial sewage at the present stage. But the aerobic activated sludge has the problems of loose structure, poor settleability, low sludge concentration in the aeration tank and low treatment capacity. The aerobic granular sludge has the characteristics of compact structure, multiple functional floras, good sedimentation performance, high sludge concentration, capability of bearing impact load caused by high organic load and water quality fluctuation and the like, is a high-quality biological material for sewage treatment, and has wide market prospect.
The cultivation of aerobic granular sludge at present mainly takes activated sludge as raw material, utilizes abundant microorganisms, extracellular polymers and shearing force in the activated sludge to carry out selective cultivation, obviously takes the aerobic activated sludge as raw material, is dehydrated by a physical method and carries out artificial granulation, can increase the types and the quantity of the microorganisms in the granulated granular sludge, utilizes the extracellular polymers secreted by the microorganisms to increase the cohesiveness of granules, and simultaneously improves the settleability and the shearing resistance of the granules by the granulated granular sludge, utilizes the artificial granulated granular sludge to cultivate under the conditions of reasonable oxygen content and fluid shearing, can increase the cultivation effect of the granular sludge, and simultaneously can carry out sewage treatment when the granulated granular sludge is taken as biological material for carrying out aerobic granulation cultivation.
At present, the culture time of aerobic granular sludge by using activated sludge as inoculated sludge generally needs more than 40-60 days, which brings many problems to the practical application of granular sludge technology, such as the increase of the operation cost, the problem that the effluent quality in the starting process can not reach the standard and the like; the granulation process of the flocculent sludge is accelerated by adding the induction nucleus or the divalent metal ions, so that the operation cost is increased, and the acceleration speed is not particularly ideal. Therefore, how to accelerate the granulation process of the flocculent sludge and realize the large-scale application of the aerobic granular sludge technology becomes a problem of interest in the industry.
Disclosure of Invention
Aiming at the problems, the invention provides a method for quickly culturing granular sludge, which aims to solve the problem of long culture time of the granular sludge.
The technical scheme provided by the invention is as follows:
the utility model provides a continuous secondary flow coagulation gas stripping fluidized bed reactor of continuous culture aerobic granule mud and processing sewage, reactor main part is made by two inside and outside cylindrical organic glass, including four districts totally of fluidization region (14), water grain disengagement zone (20), backward flow room (13), settling zone (2), wherein:
(1) the fluidization area (14) is formed by cylindrical organic glass inside, upflow aeration and upflow water flow are guided to enter the fluidization area (14) through a baffle (8) below the fluidization area (14), a multilayer inclined plate (19) is arranged above the fluidization area (14) to form a water particle separation area (20), water particle separation is carried out through a water outlet (18), a reflux chamber (13) is formed between the inner wall of the cylindrical organic glass outside below the multilayer inclined plate (19) and the outer wall of the cylindrical organic glass inside, a sedimentation area (3) is separated below the aeration ring (5) and the water inlet (7), and settled granular sludge is discharged through a sludge valve (1); a stirring rod (15) controlled by a stirring head (16) is arranged in the fluidization area (14), the granulated sludge enters the fluidization area (14) under the action of an upflow water inlet (7) and an upflow aeration port (5), and secondary flowing hydraulic shearing is carried out under the action of the stirring rod (15) and aeration and rising water flow;
(2) water particle separation zone (20): a plurality of layers of inclined plates (19) are arranged above the fluidization area (14) to form a water particle separation area (20), and a partition plate (20) is arranged under the action of aeration and ascending water flow to separate water particles through a water outlet (18);
(3) a reflow chamber (13): the device is composed of an inner wall of external cylindrical organic glass and an outer wall of inner cylindrical organic glass, fine particles in a fluidization area exceed the inner cylindrical organic glass under the fluidization effect, the rising speed of water flow is reduced, the fine particles enter a backflow chamber (13) under the action of gravity, the bottom of the backflow chamber (13) can be communicated with the fluidization area, and the backflow granular sludge enters the fluidization area under the action of gravity;
(4) settling zone (2): the aeration ring (5) and the water inlet (7) are arranged below, the weight of the aerobic granular sludge is continuously increased along with the extension of the culture time in a fluidized state, when the mass of the aerobic granular sludge exceeds the fluidization supporting force, the aerobic granular sludge is settled and enters the settling zone (2) from the fluidization zone (13), a sludge discharge port (1) is arranged in the settling zone (2), and excessive sludge settlement can be discharged through the sludge discharge port (1).
The reactor, preferably, the lower part of the outer cylinder is in a cone shape.
Furthermore, the reactor also comprises a diffuse reflection plate (17) which is beneficial to improving the observation effect of light rays passing through the observation hole.
Further, the reactor is also provided with an observation hole (11) on the outer cylindrical shape; the stirring head (16) is driven by a motor.
Meanwhile, the invention also provides a method for rapidly culturing granular sludge by using the reactor, which comprises the following steps:
(1) aerobic activated sludge selection: selecting activated sludge of different sewage treatment processes according to the quality of sewage to be treated so as to ensure the type and quantity of specific microorganisms in the activated sludge;
(2) and (3) dehydrating: reducing the water content of the common activated sludge by a physical method, wherein the dehydration method can be a natural air drying, vacuum filtration or centrifugal dehydration method, so that the common activated sludge becomes compact;
(3) and (3) granulation: the dehydrated activated sludge is crushed into sludge particles with the particle size similar to that of the granular sludge by methods of mechanical crushing, stirring, cutting or adding a fixing agent such as agar and the like, and the particle size is controlled by a screen to be similar to that of the granular sludge to be cultured;
(4) adding the granulated granular sludge to the reactor of any one of claims 1 to 5;
(5) sewage rises from a sewage pump (6) through a flow meter (4) from a water inlet (7) and enters a fluidization region (14), air enters the fluidization region (14) through an aerator (3) and the flow meter (4) from an aeration ring (5) in an aeration amount, and a reasonable secondary flow field is formed under the stirring of a stirring rod (15);
(6) culturing for 15 days under the action of aeration, water flow and hydraulic shearing generated by stirring to initially form aerobic granular sludge;
(7) the weight of the aerobic granular sludge is continuously increased along with the extension of the culture time in a fluidization state, when the mass of the aerobic granular sludge exceeds the fluidization supporting force, the aerobic granular sludge is settled into a settling zone (2), the aim of continuously updating the aerobic granular sludge is fulfilled, and excessive sludge settlement can be discharged through a sludge discharge port (1);
(8) the clear water after continuous culture and fluidized bed treatment enters a separation zone (20) through a separation inclined plate (19) and then is discharged through a water outlet (18).
The invention has the beneficial effects that: the granulated sludge is utilized to adopt the secondary flow gas stripping fluidized bed provided by the invention to quickly culture the granulated sludge, the specific abundant species of micro-objects and extracellular polymeric substances in the granulated sludge have good settling property and better hydraulic shear resistance, and play the roles of induction nucleus and initial particles in a reactor, and the granulated sludge is utilized to culture the granulated sludge, so that the formation time of aerobic granulated sludge is greatly shortened, the aerobic culture process of the granulated sludge has good sewage treatment effect, the purpose of treating while culturing is realized, and the time required by starting the granulated sludge is shortened.
Drawings
FIG. 1 is a schematic structural diagram of a continuous secondary flow coagulation air stripping fluidized bed reactor (SAFB) for continuously culturing aerobic granular sludge and treating sewage according to the present invention.
Wherein, 1, a sludge valve, 2, a sludge settling zone, 3, an aerator, 4, a flowmeter, 5, an aeration ring, 6, a sewage pump, 7, a sewage inlet, 8, a baffle, 9, a computer, 10, a high-speed camera, 11 an observation hole, 12 a light source,
13. a reflux chamber, 14 a fluidization area, 15 a stirring rod, 16 a motor (stirring head), 17 a diffuse reflection plate,
18 water outlets, 19 inclined plates and 20 water particle separation areas.
Detailed Description
Example one: the invention relates to a secondary flow gas stripping fluidized bed (SAFB) reactor for quickly culturing aerobic granular sludge by using granulated granular sludge
Referring to fig. 1, the main body of the secondary flow air stripping fluidized bed reactor (SAFB) for rapidly culturing aerobic granular sludge by granulating granular sludge of the present invention is made of inner and outer cylindrical organic glass, the inner diameter of the outer cylinder is 173mm, the height is 700mm, the distance between the water outlet hole and the upper edge is 30mm, the effective volume is 6.3L, the height of the lower cone is 150mm, the effective volume is 0.5L, the inner diameter of the inner cylinder is 100mm, the height is 650mm, and the effective volume is 5.1L.
The device comprises a fluidization area 14 formed by internal cylindrical organic glass, a baffle 8 is arranged below the fluidization area 14, upflow aeration and upflow water flow are guided to enter the fluidization area 14, a multilayer inclined plate 19 is arranged above the fluidization area 14 to form a water particle separation area 20, water particle separation is carried out through a water outlet 18, a backflow chamber 13 is formed between the inner wall of the external cylindrical organic glass below the multilayer inclined plate 19 and the outer wall of the internal cylindrical organic glass, a settling area 3 is formed below an aeration ring 5 and a water inlet 7, and settled granular sludge is discharged through a sludge valve 1.
Fluidizing zone 13: the fluidization area 13 is arranged in the inner cylindrical organic glass, a stirring rod 15 controlled by a stirring head 16 is arranged in the fluidization area, the granulated sludge enters the fluidization area 13 under the action of the upflow water inlet 7 and the upflow aeration port 5, and secondary hydrodynamic shearing is carried out under the action of the stirring rod 15, aeration and ascending water flow.
Water particle separation zone 20: a plurality of layers of inclined plates 19 are arranged above the fluidization area 14 to form a water particle separation area 20, a partition plate 20 is arranged under the action of aeration and ascending water flow, water particle separation is carried out through a water outlet 18, particles are settled through the inclined plates, and clean water flows out through the water outlet.
The reflux chamber 13: the device is composed of an inner wall of external cylindrical organic glass and an outer wall of inner cylindrical organic glass, fine particles in a fluidization area exceed the inner cylindrical organic glass under the fluidization effect, the rising speed of water flow is reduced, the fine particles enter a backflow chamber 13 under the action of gravity, the bottom of the backflow chamber 13 can be communicated with the fluidization area, and the backflow granular sludge enters the fluidization area under the action of gravity;
a settling zone 2: the aerobic granular sludge is arranged below the aeration ring 5 and the water inlet 7, the weight of the aerobic granular sludge is continuously increased along with the extension of the culture time in a fluidized state, when the mass of the aerobic granular sludge exceeds the fluidization supporting force, the aerobic granular sludge is settled and enters the settling zone 2 from the fluidization zone (13), a sludge discharge port 1 is arranged in the settling zone 2, and excessive sludge settlement can be discharged through the sludge discharge port 1.
Example two: method embodiment of the invention
The reactor of the first embodiment is used for treating sewage of a certain sewage treatment plant.
1. Aerobic activated sludge selection: the activated sludge of different sewage treatment processes is selected according to the quality of sewage to be treated, and in order to ensure the type and the quantity of special microorganisms in the activated sludge, the activated sludge of a process section with the maximum activity and concentration is selected, such as activated sludge of an aeration tank of a domestic sewage treatment plant, and activated sludge of different industrial treatment biological treatment sections, such as activated sludge in an aeration tank of aquaculture wastewater. In this example, activated sludge in an aeration tank of a sewage treatment plant of city, Hengyang city was selected.
2. And (3) dehydrating: the activated sludge is selected, the water content of the common activated sludge is reduced by a physical method, and the dehydration method can be natural air drying, vacuum filtration, centrifugal dehydration and the like, so that the activated sludge becomes compact.
3. And (3) granulation: activated sludge is selected through dewatering and then broken into sludge particles similar to the particle size of granular sludge by mechanical disruption, stirring, cutting, or addition of a solidifying agent such as agar, but none of these methods can destroy the cellular structure of microorganisms. The compactness of the sludge granules not only can bear hydraulic or aeration shearing force in the reactor, but also can ensure good mass transfer effect, so that oxygen and nutrient substances can be diffused into the sludge granules. The particle size of the crushed compact granular sludge is controlled by a screen mesh of 60-80 meshes, so that the particle size of the crushed compact granular sludge is similar to that of the granular sludge to be cultured.
4. 20g of granular sludge was selected to be added to the secondary stream stripping fluidized bed (SAFB) of example one.
5. Sewage rises from the sewage pump 6 through the flow meter 4 from the water inlet 7 at the flow rate of 2.5m/h and enters the fluidization region 14, air enters the fluidization region 14 through the aerator 3 and the flow meter 4 from the aeration ring 5 at the aeration rate of 7L/min, and a reasonable secondary flow field is formed under the control of the stirring speed of the stirring rod 15 of 10 r/min.
6. Under the action of aeration, water flow and hydraulic shearing generated by stirring, the aerobic granular sludge is primarily formed after 15 days of culture.
7. The weight of the aerobic granular sludge is continuously increased along with the extension of the culture time in a fluidization state, when the mass of the aerobic granular sludge exceeds the fluidization supporting force, the aerobic granular sludge is settled into the settling zone 2, the aim of continuously updating the aerobic granular sludge is fulfilled, and excessive sludge settlement can be discharged through the sludge discharge port 1.
8. The clear water after continuous culture and fluidized bed treatment enters the separation zone 20 through the separation inclined plate 19 and then is discharged through the water outlet 18.
In the embodiment, dense sludge particles are put into a reactor, the reactor is a Secondary-flow air-lift Fluidized Bed (Secondary-flow air Fluidized Bed SAFB), the reactor adopts a double-cylinder design, an outer inclined plate is arranged at the lower end of an inner cylinder, a fluidization area is arranged in the inner cylinder, stirring slurry is arranged in the middle of the inner cylinder, the Secondary flow field effect is increased in the stirring process, the rising speed of fluid is slowed down, sludge-strengthening granulation particles are sheared by aeration gas flowing in with water entering from the lower part, the collision probability of the particles and a matrix is improved, the sludge particles are sheared and molded, fine particles in the Fluidized Bed overflow the boundary of the inner cylinder through impact, enter a reflux chamber between the inner cylinder and the outer cylinder under the action of gravity, continuously sink through the outer inclined plate of the inner cylinder and enter the fluidization area for continuous culture, a cone-shaped cylinder is arranged at the lower part of the outer cylinder, an aeration hose is arranged at the middle part of the cone shape, a water inlet pipe is arranged at, the lower part of the inner cylinder is guided by the outer inclined plate of the inner cylinder to enter the inner cylinder fluidization area to realize fluidization, the lower part of the inner cylinder is provided with a sludge settling area, large-particle sludge sinks into the bottom under the action of gravity to accumulate, and the excessive sludge is discharged through a sludge valve. The water inlet and the aeration are controlled by the flow meter, the middle part of the inner cylinder is provided with an observation hole, the observation hole shoots sludge particles and the diameter of bubbles by a laser particle size analyzer and a high-speed camera, and the back of the observation hole is provided with a diffuse reflection plate 17, so that the observation effect of light passing through the observation hole is improved.
In one embodiment, the results show that the wastewater treated by the reactor of the present invention has a COD removal rate of 95.75/%, a BOD removal rate of 94.83%, a SS removal rate of 96.41%, a NH3-N removal rate of 91.48%, a TP removal rate of 95.31%, and a TN removal rate of 85.74%.

Claims (7)

1. The utility model provides a continuous secondary flow coagulation gas stripping fluidized bed reactor of continuous culture aerobic granule mud and processing sewage, reactor main part is by the urceolus and the inner tube that two inside and outside cylindrical organic glass made, including four districts totally of fluidization region (14), water grain disengagement zone (20), backward flow room (13), settling zone (2), wherein:
(1) the fluidization area (14) is formed by cylindrical organic glass inside, upflow aeration and upflow water flow are guided to enter the fluidization area (14) through a baffle (8) below the fluidization area (14), a multilayer inclined plate (19) is arranged above the fluidization area (14) to form a water particle separation area (20), water particle separation is carried out through a water outlet (18), a reflux chamber (13) is formed between the inner wall of the cylindrical organic glass outside below the multilayer inclined plate (19) and the outer wall of the cylindrical organic glass inside, a sedimentation area (3) is separated below the aeration ring (5) and the water inlet (7), and settled granular sludge is discharged through a sludge valve (1); a stirring rod (15) controlled by a stirring head (16) is arranged in the fluidization area (14), the granulated sludge enters the fluidization area (14) under the action of an upflow water inlet (7) and an upflow aeration port (5), and secondary flowing hydraulic shearing is carried out under the action of the stirring rod (15) and aeration and rising water flow;
(2) water particle separation zone (20): a plurality of layers of inclined plates (19) are arranged above the fluidization area (14) to form a water particle separation area (20), and a partition plate (20) is arranged under the action of aeration and ascending water flow to separate water particles through a water outlet (18);
(3) a reflow chamber (13): the device is composed of an inner wall of external cylindrical organic glass and an outer wall of inner cylindrical organic glass, fine particles in a fluidization area exceed the inner cylindrical organic glass under the fluidization effect, the rising speed of water flow is reduced, the fine particles enter a backflow chamber (13) under the action of gravity, the bottom of the backflow chamber (13) can be communicated with the fluidization area, and the backflow granular sludge enters the fluidization area under the action of gravity;
(4) settling zone (2): the aeration ring (5) and the water inlet (7) are arranged below, the weight of the aerobic granular sludge is continuously increased along with the extension of the culture time in a fluidized state, when the mass of the aerobic granular sludge exceeds the fluidization supporting force, the aerobic granular sludge is settled and enters the settling zone (2) from the fluidization zone (13), a sludge discharge port (1) is arranged in the settling zone (2), and excessive sludge settlement can be discharged through the sludge discharge port (1);
the lower part of the outer cylinder is in a conical shape, and the lower end of the inner cylinder is provided with an outer inclined plate; the middle part of the outer cylinder is also provided with an observation hole (11) for diffusing a reflection plate (17).
2. The reactor of claim 1, wherein: the stirring head (16) is driven by a motor.
3. A method for rapidly culturing granular sludge by using the reactor as claimed in claim 1 or 2, characterized by comprising the steps of:
(1) aerobic activated sludge selection: selecting activated sludge of different sewage treatment processes according to the quality of sewage to be treated so as to ensure the type and quantity of specific microorganisms in the activated sludge;
(2) reducing the water content of the common activated sludge by a physical method, wherein the dehydration method is a natural air drying, vacuum filtration or centrifugal dehydration method, so that the common activated sludge becomes compact;
(3) the dehydrated activated sludge is crushed into sludge particles with the particle size similar to that of granular sludge through mechanical crushing, stirring, cutting or adding a solidifying agent, and the particle size is controlled through a screen to be similar to that of the granular sludge to be cultured;
(4) adding the granulated granular sludge to the reactor of claim 1 or 2;
(5) sewage rises from a sewage pump (6) through a flow meter (4) from a water inlet (7) and enters a fluidization region (14), air enters the fluidization region (14) through an aerator (3) and the flow meter (4) from an aeration ring (5) in an aeration amount, and a reasonable secondary flow field is formed under the stirring of a stirring rod (15);
(6) culturing for 15 days under the action of aeration, water flow and hydraulic shearing generated by stirring to initially form aerobic granular sludge;
(7) the weight of the aerobic granular sludge is continuously increased along with the extension of the culture time in a fluidization state, when the mass of the aerobic granular sludge exceeds the fluidization supporting force, the aerobic granular sludge is settled into a settling zone (2), the aim of continuously updating the aerobic granular sludge is fulfilled, and excessive sludge settlement can be discharged through a sludge discharge port (1);
(8) the clear water after continuous culture and fluidized bed treatment enters a separation zone (20) through a separation inclined plate (19) and then is discharged through a water outlet (18).
4. The method of claim 3, wherein: in the step (3), the solidifying agent is agar.
5. The method of claim 3, wherein: and (3) selecting the activated sludge with the highest activity and concentration in the process section in the step (1).
6. The method of claim 5, wherein: the activated sludge in the step (1) is activated sludge of an aeration tank of an activated sewage treatment plant and activated sludge of different industrial treatment biological treatment sections.
7. The method of claim 6, wherein: the activated sludge of different industrial treatment biological treatment sections is activated sludge in the culture wastewater aeration tank.
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CN108946912A (en) * 2018-08-13 2018-12-07 竺林坤 A kind of oxidation oxidation reaction apparatus for rural sewage treatment
WO2020237387A1 (en) * 2019-05-31 2020-12-03 Uti Limited Partnership A simple method for desiccation and reactivation of aerobic granules
CN111498991A (en) * 2020-04-29 2020-08-07 南京大学 Method for promoting proliferation and activity improvement of anaerobic granular sludge

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