CN107311309B - Up-flow internal circulation micro-oxygen bioreactor, aeration method for strengthening mass transfer and using method thereof - Google Patents
Up-flow internal circulation micro-oxygen bioreactor, aeration method for strengthening mass transfer and using method thereof Download PDFInfo
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- CN107311309B CN107311309B CN201710652930.9A CN201710652930A CN107311309B CN 107311309 B CN107311309 B CN 107311309B CN 201710652930 A CN201710652930 A CN 201710652930A CN 107311309 B CN107311309 B CN 107311309B
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
- C02F7/00—Aeration of stretches of water
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/02—Fluid flow conditions
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
An upflow internal circulation micro-oxygen bioreactor, an aeration method and a use method for strengthening mass transfer, and relates to the micro-oxygen bioreactor, the aeration method and the use method for strengthening mass transfer. The invention solves the problems of large energy consumption and large equipment investment in the existing micro-oxygen environment control mode, uneven oxygen dissolution and reinforced mass transfer mode. The upflow internal circulation micro-oxygen bioreactor consists of a micro-oxygen reactor shell, a parabolic guide hood, a slender guide pipe, a first conical gas collecting hood, an aeration chamber, a water inlet pipe, a first exhaust pipe, an exhaust valve, a mud pipe, an aeration piece, an air inlet pipe, an aerator, an on-line dissolved oxygen control device, a dissolved oxygen electrode, a guide hood support, a guide pipe support and a water inlet pump. Aeration method and usage method: 1. aerating; 2. an internal recycle stream; 3. and (5) monitoring.
Description
Technical Field
The invention relates to a micro-oxygen bioreactor, an aeration method for strengthening mass transfer and a use method thereof.
Background
The micro-aerobic environment in the micro-aerobic bioreactor can enable aerobic, anaerobic and facultative microorganisms to coexist and play a synergistic role, so that synchronous removal of carbon, nitrogen and phosphorus in sewage is realized, the sewage treatment process flow is simplified, and engineering investment and operation cost are saved. Thus, the development and operation of micro-aerobic bioreactors is receiving increasing attention. How to control the micro-oxygen environment of the micro-oxygen bioreactor is the key to the development of the micro-oxygen bioreactor, and at present, two control methods for the micro-oxygen environment exist: firstly, the method of aerating the effluent and then refluxing the effluent into the reactor and controlling the aeration quantity and reflux quantity, and secondly, the method of arranging an aeration head at the bottom of the reactor and controlling the aeration quantity. However, both of these micro-aerobic environmental control methods have significant drawbacks: the aeration quantity and the reflux quantity of the effluent are large, the power consumption is high, and the operation regulation and control difficulty of the reactor is increased due to the coupling of the aeration system and the reflux system; the latter has the defect of uneven oxygen dissolution, and bubbles with larger kinetic energy can damage the structure of sludge flocs or particles, so as to influence the treatment efficiency of the system. Enhancing mass transfer between oxygen, wastewater contaminants, and microorganisms is yet another key to improving and maintaining the processing efficiency of the micro-oxygen treatment system. At present, two modes of enhancing mass transfer exist, one is to enhance the reflux of effluent water to enhance the mass transfer, and the other is to add stirring devices such as stirring paddles and the like to enhance the mass transfer. The two reinforced mass transfer modes not only greatly increase the power consumption of the system operation, but also influence the sedimentation of the sludge. In addition, the stirring device can increase equipment investment and engineering investment. Therefore, an effective and economical micro-oxygen environment control method and a mass transfer strengthening method are important factors for popularization and application of the micro-oxygen biological treatment technology.
Disclosure of Invention
The invention aims to solve the problems of large energy consumption, nonuniform oxygen dissolution and large energy consumption and large equipment investment in an enhanced mass transfer mode in the conventional micro-oxygen environment control, and provides an upflow internal circulation micro-oxygen bioreactor, an aeration method for enhancing mass transfer and a use method thereof.
The upflow internal circulation micro-oxygen bioreactor consists of a micro-oxygen reactor shell, a parabolic guide hood, a slender guide pipe, a first conical gas collecting hood, an aeration chamber, a water inlet pipe, a first exhaust pipe, an exhaust valve, a mud pipe, an aeration piece, an air inlet pipe, an aerator, an on-line dissolved oxygen control device, a dissolved oxygen electrode, a guide hood bracket, a guide pipe bracket and a water inlet pump;
the micro-oxygen reactor shell consists of a water distribution taper pipe, a first air guide ring, a main reaction pipe, a second air guide ring, a mud settling taper pipe, an overflow pipe, a U-shaped drain pipe, a circular ring plate, an ultrahigh pipe, a circular flange plate, a circular flange pad, a device round cover, a reducing exhaust pipe and a second conical gas collecting hood;
the lower end of the main reaction tube is communicated with one end with a larger water distribution taper tube orifice, the upper end of the main reaction tube is communicated with one end with a smaller mud sinking taper tube orifice, one end with a larger mud sinking taper tube orifice is communicated with the lower end of the overflow tube, the upper end of the overflow tube is provided with a saw tooth opening, the outer circumference of the overflow tube is provided with a circular plate, the circular plate is positioned below the saw tooth opening, the upper surface of the circular plate is in sealing connection with the lower end of the ultrahigh tube, the upper end of the ultrahigh tube is higher than the upper end of the overflow tube, the upper end of the ultrahigh tube is provided with an annular flange plate, a plurality of flange holes are uniformly distributed on the annular flange plate, equipment round covers are arranged on the annular flange plate, and annular flange pads are arranged between the annular flange plate and the equipment round covers;
The upper end of the main reaction tube is internally provided with a second air guide ring, and the lower end of the main reaction tube is internally provided with a first air guide ring; the first air guide ring and the second air guide ring are circular rings, the cross section of each circular ring is triangular, and the inner diameter of the first air guide ring is smaller than that of the second air guide ring;
the circular plate is provided with a drain hole, and the drain hole on the circular plate is communicated with the U-shaped drain pipe;
the diameter-variable exhaust pipe consists of a second exhaust pipe and a third exhaust pipe, the diameter of the second exhaust pipe is larger than that of the third exhaust pipe, one end of the second exhaust pipe is communicated with one smaller end of the orifice of the second conical gas collecting hood, the other end of the second exhaust pipe sequentially penetrates out of the center positions of the annular flange plate, the annular flange gasket and the equipment dome, and the end of the second exhaust pipe penetrating out of the equipment dome is communicated with one end of the third exhaust pipe;
one end of the second conical gas collecting hood, which is larger in pipe opening, is positioned in the mud sinking taper pipe, and a gap is reserved between the second conical gas collecting hood and the mud sinking taper pipe;
the aeration chamber consists of a hemispherical cover top, a circular tube and a conical mud storage hopper; the upper end of the circular tube is provided with a hemispherical cover top, the smaller end of the mouth of the water distribution taper tube is in sealing connection with the outer circumference of the circular tube, the hemispherical cover top is arranged in the water distribution taper tube and is positioned below the first air guide ring, the lower end of the circular tube is communicated with the larger end of the mouth of the conical mud storage hopper, the side wall of the circular tube is provided with a water inlet and an air inlet, the water inlet on the circular tube is communicated with one end of the water inlet tube, the other end of the water inlet tube is communicated with a water inlet pump, the air inlet tube penetrates through the air inlet on the circular tube, one end of the air inlet tube is arranged in the circular tube and is connected with an aeration piece, the other end of the air inlet tube is arranged outside the circular tube and is connected with an aerator, the aerator is connected with an on-line control device for dissolved oxygen, the on-line control device for dissolved oxygen is provided with an electrode, the dissolved oxygen electrode is arranged at the upper part of the main reaction tube and penetrates into the main reaction tube, the lower end of the circular tube is communicated with the larger end of the mouth of the conical mud storage hopper, the first air outlet tube penetrates through the side wall of the conical mud storage hopper, one end of the first air outlet tube is positioned inside the hemispherical cover, and the end of the hemispherical cover is positioned inside the hemispherical cover, and the end of the hemispherical cover is higher than the round small end of the mouth of the cover is communicated with the round hole is arranged;
The first conical gas collecting hood is arranged inside the main reaction tube and is positioned above the first gas guide ring, the diameter of the larger end of the orifice of the first conical gas collecting hood is smaller than that of the main reaction tube, the smaller end of the orifice of the first conical gas collecting hood is communicated with one end of the slender conduit, the slender conduit is fixed inside the main reaction tube through the conduit support, the parabolic guide hood is arranged right above the other end of the slender conduit and is fixed on the upper portion of the main reaction tube through the guide hood support, and the opening area of the parabolic guide hood is more than 2 times of the cross section area of the slender conduit.
The aeration method for enhancing mass transfer of the upflow internal circulation micro-oxygen bioreactor comprises the following steps:
1. aerating:
the sewage enters an aeration chamber from a water inlet pipe, air conveyed by an aerator passes through an air inlet pipe to reach an aeration piece and generate micro-bubbles, the sewage and the micro-bubbles are mixed in the aeration chamber with limited space to oxygenate, the micro-bubbles collide and merge with each other in the aeration chamber, the bubbles are discharged from a part of the sewage through a first exhaust pipe, and the rest of the bubbles enter the bottom of the micro-oxygen reactor shell along with the sewage from a plurality of circles of small holes on the hemispherical cover top at the upper end of the aeration chamber; the bottom of the micro-oxygen reactor shell is provided with a microbial sludge bed layer; the microbial sludge bed layer is internally provided with aerobic microorganisms, anaerobic microorganisms, facultative aerobic microorganisms and facultative anaerobic microorganisms;
2. An internal recycle stream:
the bubbles and a part of the muddy water mixture continuously rise and are collected by the first conical gas collecting hood, rise to the top of the slender conduit in the slender conduit, change the fluid direction by the parabolic guide hood, the bubbles and a part of the muddy water mixture continuously move upwards, the other part of the muddy water mixture sinks and flows, the sunk muddy water mixture enters the first conical gas collecting hood again, and a circulating flow from the center to the periphery of the main reaction tube is formed in the main reaction tube;
3. monitoring:
the dissolved oxygen concentration in the up-flow internal circulation micro-aerobic bioreactor is obtained through the dissolved oxygen electrode, and is converted into an electric signal which is transmitted to the dissolved oxygen on-line control device to dynamically adjust the aeration quantity of the aerator, so that the aerobic microorganisms, the anaerobic microorganisms, the facultative aerobic microorganisms and the facultative anaerobic microorganisms in the up-flow internal circulation micro-aerobic bioreactor are in a micro-aerobic environment of 0.3mg/L to 0.5 mg/L.
The use method of the upflow internal circulation micro-oxygen bioreactor comprises the following steps:
1. aerating:
the sewage enters an aeration chamber from a water inlet pipe, air conveyed by an aerator passes through an air inlet pipe to reach an aeration member and generate micro-bubbles, the sewage and the micro-bubbles are mixed in the aeration chamber with limited space to oxygenate, the micro-bubbles collide and merge with each other in the aeration chamber, the bubbles are discharged out of a part of the aeration chamber through a first exhaust pipe, the rest of the bubbles enter the bottom of a micro-oxygen reactor shell along with the sewage from a plurality of circles of small holes on the hemispherical cover top at the upper end of the aeration chamber, the proportion of the discharged bubbles is controlled to be within 30%, and the hydraulic retention time of the sewage in an up-flow internal circulation micro-oxygen bioreactor is controlled to be 6-8 h; the bottom of the micro-oxygen reactor shell is provided with a microbial sludge bed layer; the microbial sludge bed layer is internally provided with aerobic microorganisms, anaerobic microorganisms, facultative aerobic microorganisms and facultative anaerobic microorganisms;
2. An internal recycle stream:
the bubbles and a part of the muddy water mixed liquid continuously rise and are collected by the first conical gas collecting hood, the bubbles and a part of the muddy water mixed liquid rise to the top of the elongated guide pipe in the elongated guide pipe and are changed in fluid direction by the parabolic guide hood, the bubbles and a part of the muddy water mixed liquid continuously move upwards, the other part of the muddy water mixed liquid sinks and flows, the sunk muddy water mixed liquid enters the first conical gas collecting hood again, a circulating flow from the center to the periphery of the main reaction pipe is formed in the main reaction pipe, the bubbles continuously moving upwards are collected by the second conical gas collecting hood, the muddy water mixed liquid continuously moving upwards flows into the overflow pipe through a gap between the second conical gas collecting hood and the sunk mud taper pipe to be precipitated, the clear water is discharged through the U-shaped drain pipe, and the sludge is re-circulated into the main reaction pipe along the inner wall of the sunk mud taper pipe;
3. monitoring:
the dissolved oxygen concentration in the up-flow internal circulation micro-aerobic bioreactor is obtained through the dissolved oxygen electrode, and is converted into an electric signal which is transmitted to the dissolved oxygen on-line control device to dynamically adjust the aeration quantity of the aerator, so that the aerobic microorganisms, the anaerobic microorganisms, the facultative aerobic microorganisms and the facultative anaerobic microorganisms in the up-flow internal circulation micro-aerobic bioreactor are in a micro-aerobic environment of 0.3mg/L to 0.5 mg/L.
The opening degree of the exhaust valve is controlled, and the proportion of exhaust bubbles is controlled within 30 percent.
Principle analysis: the sewage and the micro-bubbles are strongly mixed in the aeration chamber with limited space to oxygenate, and the micro-bubbles collide with each other and merge in the aeration chamber to reduce the kinetic energy of the bubbles;
oxygen in the bubbles is directly utilized by aerobic microorganisms and facultative aerobic microorganisms in the microbial sludge bed layer for removing pollutants;
due to the air stripping effect of air bubbles, part of the muddy water mixed liquid above the first conical gas collecting hood is sucked into the first conical gas collecting hood, and the parabolic type gas guide hood starts to move part of the rising muddy water mixed liquid downwards, a circulating flow from the center to the periphery of the main reaction pipe is formed in the main reaction pipe, and oxygen in the air bubbles can be further dissolved and uniformly diffused in the circulating flow;
finally, carbon, nitrogen and phosphorus can be synchronously removed, and the stirring of bubbles in the upflow internal circulation micro-aerobic bioreactor and the continuous circulating mud-water mixed liquid strengthen the mass transfer effect of pollutants and microorganisms, so as to ensure the removal effect of carbon, nitrogen and phosphorus.
The invention has the advantages that: 1. the invention can be used for synchronously and efficiently removing carbon, nitrogen and phosphorus in organic sewage. The content of each pollutant in the sewage is stabilized in the following range for a long time: COD is 400mg/L to 1000mg/L, NH 4 -N is 200mg/L to 300mg/L, NO 3 -N is 0mg/L to 2mg/L, NO 2 N is 0-1 mg/L, and total phosphorus TP is 20-40 mg/L. COD of the treated sewage is less than or equal to 60mg/L and NH 4 -N≤50mg/L，TN≤80mg/L，TP≤5mg/L。
2. The aeration mode of the invention can separate aeration and backflow operations, can control the micro-oxygen environment of the reaction system and avoid the problem of high energy consumption caused by a large amount of aeration and backflow of effluent.
3. The invention can consume the kinetic energy of bubbles when the aeration is performed in a semi-closed aeration chamber, and can avoid the adverse effect of the aeration on sludge flocs or sludge particle structures as much as possible.
4. The invention utilizes the bubbles generated by aeration to form an internal circulation flow in the reactor, is beneficial to enhancing the mass transfer effect of a reaction system, remarkably improves the sewage treatment effect, simultaneously avoids a great deal of backflow and mechanical stirring of effluent, and reduces energy consumption.
5. The reactor provided by the invention has the advantages of compact structure, small occupied area, investment saving and suitability for large-scale production.
Drawings
FIG. 1 is a schematic diagram of an upflow internal circulation micro-aerobic bioreactor according to the present invention;
FIG. 2 is a schematic structural view of a housing of the micro-oxygen reactor of the present invention;
FIG. 3 is an aeration schematic of the enhanced mass transfer of the upflow internal recycle micro-aerobic bioreactor of the present invention.
Detailed Description
The first embodiment is as follows: referring to fig. 1 and 2, the upflow internal circulation micro-oxygen bioreactor of the present embodiment comprises a micro-oxygen reactor shell 1, a parabolic guide cover 2, an elongated guide pipe 3, a first conical gas collecting hood 4, an aeration chamber 5, a water inlet pipe 6, a first exhaust pipe 7, an exhaust valve 8, a mud valve 9, a mud pipe 10, an aeration member 11, an air inlet pipe 12, an aerator 13, an on-line dissolved oxygen control device 14, a dissolved oxygen electrode 15, a guide cover bracket 16, a guide pipe bracket 17 and a water inlet pump 18;
the micro-oxygen reactor shell 1 consists of a water distribution taper pipe 101, a first air guide ring 102, a main reaction pipe 103, a second air guide ring 104, a mud sinking taper pipe 105, an overflow pipe 106, a U-shaped drain pipe 107, a circular ring plate 108, an ultrahigh pipe 109, a circular flange plate 110, a circular flange pad 111, a device circular cover 112, a reducing exhaust pipe 113 and a second conical gas collecting hood 114;
the lower end of the main reaction tube 103 is communicated with one end with a larger tube orifice of the water distribution taper tube 101, the upper end of the main reaction tube 103 is communicated with one end with a smaller tube orifice of the mud sinking taper tube 105, one end with a larger tube orifice of the mud sinking taper tube 105 is communicated with the lower end of the overflow tube 106, the upper end of the overflow tube 106 is provided with a saw tooth opening, the outer circumference of the overflow tube 106 is provided with a circular plate 108, the circular plate 108 is positioned below the saw tooth opening, the upper surface of the circular plate 108 is in sealing connection with the lower end of the ultrahigh tube 109, the upper end of the ultrahigh tube 109 is higher than the upper end of the overflow tube 106, the upper end of the ultrahigh tube 109 is provided with an annular flange plate 110, a plurality of flange holes are uniformly distributed on the annular flange plate 110, the annular flange plate 110 is provided with an equipment circular cover 112, the annular flange plate 110 and the same in position and number with the annular flange plate 110 are uniformly distributed on the annular flange plate 112, and an annular flange pad 111 is arranged between the annular flange plate 110 and the equipment circular cover 112;
The upper end of the main reaction tube 103 is internally provided with a second air guide ring 104, and the lower end of the main reaction tube 103 is internally provided with a first air guide ring 102; the first air guide ring 102 and the second air guide ring 104 are circular rings, the cross section of each circular ring is triangular, and the inner diameter of the first air guide ring 102 is smaller than that of the second air guide ring 104;
the ring plate 108 is provided with drain holes, and the drain holes on the ring plate 108 are communicated with the U-shaped drain pipe 107;
the reducing exhaust pipe 113 is composed of a second exhaust pipe 113-1 and a third exhaust pipe 113-2, the diameter of the second exhaust pipe 113-1 is larger than that of the third exhaust pipe 113-2, one end of the second exhaust pipe 113-1 is communicated with one smaller end of the orifice of the second conical gas collecting hood 114, the other end of the second exhaust pipe 113-1 sequentially penetrates out of the center positions of the annular flange plate 110, the annular flange pad 111 and the equipment dome 112, and the end of the second exhaust pipe 113-1 penetrating out of the equipment dome 112 is communicated with one end of the third exhaust pipe 113-2;
one end of the second conical gas-collecting hood 114 with a larger pipe orifice is positioned in the mud sinking taper pipe 105, and a gap is reserved between the second conical gas-collecting hood 114 and the mud sinking taper pipe 105;
the aeration chamber 5 consists of a hemispherical cover top 5-1, a circular tube 5-2 and a conical mud storage hopper 5-3; the upper end of the round pipe 5-2 is provided with a hemispherical cover top 5-1, the smaller end of the pipe orifice of the water distribution taper pipe 101 is in sealing connection with the outer circumference of the round pipe 5-2, the hemispherical cover top 5-1 is arranged inside the water distribution taper pipe 101 and is positioned below the first air guide ring 102, a plurality of circles of small holes are arranged below the top of the hemispherical cover top 5-1, the side wall of the round pipe 5-2 is provided with a water inlet and an air inlet, the water inlet on the round pipe 5-2 is communicated with one end of the water inlet pipe 6, the other end of the water inlet pipe 6 is communicated with a water inlet pump 18, an air inlet pipe 12 penetrates through the air inlet on the round pipe 5-2, one end of the air inlet pipe 12 is arranged in the round pipe 5-2 and is connected with an aeration piece 11, the other end of the air inlet pipe 12 is arranged outside the round pipe 5-2 and is connected with an aerator 13, the aerator 13 is connected with a coil control device 14, the dissolved oxygen electrode 15 is arranged on the upper part of the main reaction pipe 103 and inside the main reaction pipe 103, the lower end of the round pipe 5-2 is communicated with one end of the larger pipe orifice of the conical mud storage hopper 5-3, the first air outlet pipe 7-7 penetrates through the side wall 7-7 and is connected with the small end of the small hole 9 arranged inside the round pipe 5-3, and is connected with the small end of the round pipe 8, which is arranged inside the round pipe 3 and is connected with the small end of the round pipe 8, which is arranged inside the round pipe 3 is connected with the small end of the round pipe 3;
The first conical gas-collecting channel 4 is arranged inside the main reaction tube 103 and is located above the first gas guide ring 102, the diameter of the larger end of the orifice of the first conical gas-collecting channel 4 is smaller than that of the main reaction tube 103, the smaller end of the orifice of the first conical gas-collecting channel 4 is communicated with one end of the slender conduit 3, the slender conduit 3 is fixed inside the main reaction tube 103 through the conduit support 17, the parabolic type guide cover 2 is arranged right above the other end of the slender conduit 3, the parabolic type guide cover 2 is fixed on the upper portion of the main reaction tube 103 through the guide cover support 16, and the opening area of the parabolic type guide cover 2 is more than 2 times of the cross section area of the slender conduit 3.
An annular flange pad 111 is arranged between the annular flange plate 110 and the equipment dome 112, so as to realize equipment sealing;
the larger end of the pipe orifice of the second conical gas collecting hood 114 is positioned in the mud sinking taper pipe 105, so that rising bubbles can be completely collected;
in the embodiment, a gap exists between the second conical gas collecting hood 114 and the mud settling conical pipe 105, and mud and water can freely pass through the gap;
the first conical gas collecting hood 4 is arranged inside the main reaction tube 103 and above the first gas guide ring 102, so that bubbles escaping from the aeration chamber 5 can be completely collected;
In this embodiment, the diameter of the larger end of the nozzle of the first conical gas-collecting channel 4 is smaller than the diameter of the main reaction tube 103, and there is enough gap with the main reaction tube 103 to allow sludge and water to pass through freely.
The advantages of the specific embodiment are that: 1. the specific embodiment can be used for synchronously and efficiently removing carbon, nitrogen and phosphorus in the organic sewage. The content of each pollutant in the sewage is stabilized in the following range for a long time: COD is 400mg/L to 1000mg/L, NH 4 -N is 200mg/L to 300mg/L, NO 3 -N is 0mg/L to 2mg/L, NO 2 N is 0-1 mg/L, and total phosphorus TP is 20-40 mg/L. COD of the treated sewage is less than or equal to 60mg/L and NH 4 -N≤50mg/L，TN≤80mg/L，TP≤5mg/L。
2. The aeration mode of the specific embodiment can separate two operations of aeration and reflux, can control the micro-oxygen environment of a reaction system and avoid the problem of high energy consumption caused by a large amount of aeration and reflux of effluent;
3. the aeration of the embodiment in a semi-closed aeration chamber can consume the kinetic energy of bubbles and avoid the adverse effect of the aeration on sludge flocs or sludge particle structures as much as possible.
4. The embodiment forms an internal circulation flow in the reactor by utilizing bubbles generated by aeration, is beneficial to enhancing the mass transfer effect of a reaction system, remarkably improves the sewage treatment effect, simultaneously avoids a great amount of backflow and mechanical stirring of effluent, and reduces energy consumption.
5. The reactor provided by the specific embodiment has the advantages of compact structure, small occupied area, investment saving and suitability for large-scale production.
The second embodiment is as follows: the present embodiment differs from the first embodiment in that: the opening area of the parabolic guide cover 2 is 2-4 times of the cross section area of the slender guide pipe 3. The other is the same as in the first embodiment.
And a third specific embodiment: the present embodiment differs from one or two of the embodiments in that: a gap of 1.5 cm-2 cm is reserved between the second conical gas collecting hood 114 and the mud settling conical pipe 105. The other is the same as the first or second embodiment.
The specific embodiment IV is as follows: the present embodiment differs from one or more of the embodiments in that: the upper parts of the water distribution taper pipe 101 and the main reaction pipe 103 are respectively provided with a reflux port, a reflux pipe is connected between the reflux ports, and a reflux pump is arranged on the reflux pipe. The other embodiments are the same as those of the first to third embodiments.
In the specific embodiment, when the mass transfer condition of the reactor needs to be further strengthened, a reflux pump is used for refluxing the water at the upper part of the upflow internal circulation micro-oxygen reactor to the bottom for strengthening the internal circulation flow state.
Fifth embodiment: the present embodiment differs from the first to fourth embodiments in that: the upper parts of the aeration chamber 5 and the main reaction pipe 103 are respectively provided with a reflux port, a reflux pipe is connected between the reflux ports, and a reflux pump is arranged on the reflux pipe. The other embodiments are the same as those of the first to fourth embodiments.
In the specific embodiment, when the oxygen supply condition of the reactor needs to be further enhanced, a reflux pump is used for refluxing the water at the upper part of the upflow internal circulation micro-oxygen reactor to the aeration chamber.
Specific embodiment six: referring to fig. 3, the aeration method for enhancing mass transfer of the upflow internal circulation micro-oxygen bioreactor of the present embodiment comprises the following steps:
1. aerating:
the sewage enters the aeration chamber 5 from the water inlet pipe 6, air conveyed by the aerator 13 reaches the aeration member 11 through the air inlet pipe 12 and generates micro bubbles, the sewage and the micro bubbles are mixed in the aeration chamber 5 with limited space to oxygenate, the micro bubbles collide with each other and merge in the aeration chamber 5, part of the bubbles are discharged through the first exhaust pipe 7, and the rest of the bubbles enter the bottom of the micro-oxygen reactor shell 1 along with the sewage through a plurality of circles of small holes of the hemispherical hood top 5-1 at the upper end of the aeration chamber 5; the bottom of the micro-oxygen reactor shell 1 is provided with a microbial sludge bed layer; the microbial sludge bed layer is internally provided with aerobic microorganisms, anaerobic microorganisms, facultative aerobic microorganisms and facultative anaerobic microorganisms;
2. an internal recycle stream:
the bubbles and a part of the muddy water mixture continuously ascend and are collected by the first conical gas collecting hood 4, ascend to the top of the slender conduit 3 in the slender conduit 3, change the fluid direction by the parabolic type guide hood 2, continuously move upwards, and the other part of the muddy water mixture sinks and flows, the sunk muddy water mixture enters the first conical gas collecting hood 4 again, and a circulating flow from the center to the periphery of the main reaction tube 103 is formed in the main reaction tube 103;
3. Monitoring:
the dissolved oxygen concentration in the up-flow internal circulation micro-aerobic bioreactor is obtained through the dissolved oxygen electrode 15 and is converted into an electric signal to be transmitted to the dissolved oxygen on-line control device 14 to dynamically adjust the aeration rate of the aerator 13, so that the aerobic microorganisms, the anaerobic microorganisms, the facultative aerobic microorganisms and the facultative anaerobic microorganisms in the up-flow internal circulation micro-aerobic bioreactor are in a micro-aerobic environment of 0.3mg/L to 0.5 mg/L.
The working principle of the upflow internal circulation micro-oxygen reactor in the embodiment is as follows:
the sewage enters the aeration chamber 5 to be forcedly mixed with air to be oxygenated, undissolved bubbles are discharged out of a part of the sewage through the first exhaust pipe 7, the rest enters the bottom of the micro-aerobic reactor shell 1, a microbial sludge bed is arranged in the micro-aerobic reactor shell 1, and oxygen in the bubbles can be directly utilized by aerobic microorganisms and facultative aerobic microorganisms at the bottom of the sludge bed for removing pollutants. The bubbles, after rising a small distance at the bottom of the micro-aerobic reactor shell 1, carry a part of the muddy water mixture, are guided by the first gas guide ring 102 into the first conical gas collection cover 4, and then rise to a higher position at the slender conduit 3. The parabolic guide cover 2 changes the flowing direction of the bubble, the sludge and the water mixed liquid flowing out of the slender guide pipe 3, the bubble and a part of the sludge and water mixed liquid continue to move upwards, and the other part of the sludge and water mixed liquid sinks; the bubbles in the upward flow are collected by the second conical gas-collecting hood 114, the muddy water mixture flows into the overflow pipe 106 for precipitation through a gap between the second conical gas-collecting hood 114 and the mud-sinking taper pipe 105, clear water is discharged through the U-shaped drain pipe 107, and the mud flows back into the main reaction pipe 103 again along the inner wall of the mud-sinking taper pipe 105; the sinking flowing muddy water mixed solution and the stripping action of the bubbles in the first conical gas collecting hood 4 and the slender conduit 3 pump part of muddy water mixed solution in the upper area of the first conical gas collecting hood 4 into the first conical gas collecting hood 4, and a circulating flow from the central slender conduit 3 to the periphery of the reactor is formed in the upflow internal circulation micro-oxygen reactor. Oxygen can be further dissolved and uniformly diffused in the circulating flow, dissolved oxygen information is obtained through a dissolved oxygen electrode 15 and is transmitted to a dissolved oxygen on-line control device 14 so as to dynamically adjust the aeration rate of an aerator 13, so that microorganisms in the upflow type internal circulation micro-oxygen reactor obtain a stable micro-oxygen environment, and carbon, nitrogen and phosphorus are synchronously removed; the stirring of bubbles in the upflow internal circulation micro-oxygen reactor and the continuously circulating muddy water mixed liquid strengthen the mass transfer effect of pollutants and microorganisms in the sludge, and the removal efficiency of carbon, nitrogen and phosphorus is further improved.
Seventh embodiment: the use method of the upflow internal circulation micro-oxygen bioreactor comprises the following steps:
1. aerating:
the sewage enters the aeration chamber 5 from the water inlet pipe 6, air conveyed by the aerator 13 reaches the aeration member 11 through the air inlet pipe 12 and generates micro bubbles, the sewage and the micro bubbles are mixed in the aeration chamber 5 with limited space to oxygenate, the micro bubbles collide with each other and merge in the aeration chamber 5, part of the bubbles are discharged through the first exhaust pipe 7, the rest of the bubbles enter the bottom of the micro-oxygen reactor shell 1 along with the sewage from a plurality of circles of small holes of the hemispherical hood top 5-1 at the upper end of the aeration chamber 5, the proportion of the discharged bubbles is controlled to be within 30%, and the hydraulic retention time of the sewage in the upflow type internal circulation micro-oxygen bioreactor is controlled to be 6-8 h; the bottom of the micro-oxygen reactor shell 1 is provided with a microbial sludge bed layer; the microbial sludge bed layer is internally provided with aerobic microorganisms, anaerobic microorganisms, facultative aerobic microorganisms and facultative anaerobic microorganisms;
2. an internal recycle stream:
the bubbles and a part of the muddy water mixture continuously ascend and are collected by the first conical gas collecting hood 4, ascend to the top of the slender conduit 3 in the slender conduit 3, the fluid direction is changed by the parabolic type guide hood 2, the bubbles and a part of the muddy water mixture continuously move upwards, the other part of the muddy water mixture sinks and flows, the muddy water mixture which flows downwards enters the first conical gas collecting hood 4 again, a circulating flow from the center to the periphery of the main reaction tube 103 is formed in the main reaction tube 103, the bubbles which continuously move upwards are collected by the second conical gas collecting hood 114, the muddy water mixture which continuously moves upwards flows into the overflow pipe 106 through a gap between the second conical gas collecting hood 114 and the immersed mud taper tube 105 for precipitation, the clear water is discharged through the U-shaped drain pipe 107, and the sludge flows back into the main reaction tube 103 again along the inner wall of the immersed mud taper tube 105;
3. Monitoring:
the dissolved oxygen concentration in the up-flow internal circulation micro-aerobic bioreactor is obtained through the dissolved oxygen electrode 15 and is converted into an electric signal to be transmitted to the dissolved oxygen on-line control device 14 to dynamically adjust the aeration rate of the aerator 13, so that the aerobic microorganisms, the anaerobic microorganisms, the facultative aerobic microorganisms and the facultative anaerobic microorganisms in the up-flow internal circulation micro-aerobic bioreactor are in a micro-aerobic environment of 0.3mg/L to 0.5 mg/L.
The proportion of undissolved microbubbles discharged is controlled within 30 percent so as to ensure that a sludge bed rich in microorganisms in the micro-aerobic reactor shell 1 is moderately expanded and maintains proper bubble quantity to form a good internal circulation flow state.
Eighth embodiment: the present embodiment differs from the seventh embodiment in that: in the first step, the hydraulic retention time of the sewage in the upflow internal circulation micro-oxygen bioreactor is controlled to be 8 hours. The other is the same as in the seventh embodiment.
The effect of the invention was verified using the following examples:
embodiment one:
an upflow internal circulation micro-oxygen bioreactor is used for producing sewage containing carbon, nitrogen and phosphorus pollutants in pig farms. The content of each pollutant in the sewage is stabilized in the following range for a long time: COD is 400mg/L to 1000mg/L, NH 4 -N is 200mg/L to 300mg/L, NO 3 -N is 0mg/L to 2mg/L, NO 2 N is 0-1 mg/L, and total phosphorus TP is 20-40 mg/L.
The upflow internal circulation micro-oxygen bioreactor consists of a micro-oxygen reactor shell 1, a parabolic guide cover 2, an elongated guide pipe 3, a first conical gas collecting cover 4, an aeration chamber 5, a water inlet pipe 6, a first exhaust pipe 7, an exhaust valve 8, a mud valve 9, a mud pipe 10, an aeration piece 11, an air inlet pipe 12, an aerator 13, an online dissolved oxygen control device 14, a dissolved oxygen electrode 15, a guide cover bracket 16, a guide pipe bracket 17 and a water inlet pump 18;
the micro-oxygen reactor shell 1 consists of a water distribution taper pipe 101, a first air guide ring 102, a main reaction pipe 103, a second air guide ring 104, a mud sinking taper pipe 105, an overflow pipe 106, a U-shaped drain pipe 107, a circular ring plate 108, an ultrahigh pipe 109, a circular flange plate 110, a circular flange pad 111, a device circular cover 112, a reducing exhaust pipe 113 and a second conical gas collecting hood 114;
the lower end of the main reaction tube 103 is communicated with one end with a larger tube orifice of the water distribution taper tube 101, the upper end of the main reaction tube 103 is communicated with one end with a smaller tube orifice of the mud sinking taper tube 105, one end with a larger tube orifice of the mud sinking taper tube 105 is communicated with the lower end of the overflow tube 106, the upper end of the overflow tube 106 is provided with a saw tooth opening, the outer circumference of the overflow tube 106 is provided with a circular plate 108, the circular plate 108 is positioned below the saw tooth opening, the upper surface of the circular plate 108 is in sealing connection with the lower end of the ultrahigh tube 109, the upper end of the ultrahigh tube 109 is higher than the upper end of the overflow tube 106, the upper end of the ultrahigh tube 109 is provided with an annular flange plate 110, a plurality of flange holes are uniformly distributed on the annular flange plate 110, the annular flange plate 110 is provided with an equipment circular cover 112, the annular flange plate 110 and the same in position and number with the annular flange plate 110 are uniformly distributed on the annular flange plate 112, and an annular flange pad 111 is arranged between the annular flange plate 110 and the equipment circular cover 112;
The upper end of the main reaction tube 103 is internally provided with a second air guide ring 104, and the lower end of the main reaction tube 103 is internally provided with a first air guide ring 102; the first air guide ring 102 and the second air guide ring 104 are circular rings, the cross section of each circular ring is triangular, and the inner diameter of the first air guide ring 102 is smaller than that of the second air guide ring 104;
the ring plate 108 is provided with drain holes, and the drain holes on the ring plate 108 are communicated with the U-shaped drain pipe 107;
the reducing exhaust pipe 113 is composed of a second exhaust pipe 113-1 and a third exhaust pipe 113-2, the diameter of the second exhaust pipe 113-1 is larger than that of the third exhaust pipe 113-2, one end of the second exhaust pipe 113-1 is communicated with one smaller end of the orifice of the second conical gas collecting hood 114, the other end of the second exhaust pipe 113-1 sequentially penetrates out of the center positions of the annular flange plate 110, the annular flange pad 111 and the equipment dome 112, and the end of the second exhaust pipe 113-1 penetrating out of the equipment dome 112 is communicated with one end of the third exhaust pipe 113-2;
one end of the second conical gas-collecting hood 114 with a larger pipe orifice is positioned in the mud sinking taper pipe 105, and a gap is reserved between the second conical gas-collecting hood 114 and the mud sinking taper pipe 105;
the aeration chamber 5 consists of a hemispherical cover top 5-1, a circular tube 5-2 and a conical mud storage hopper 5-3; the upper end of the round pipe 5-2 is provided with a hemispherical cover top 5-1, the smaller end of the pipe orifice of the water distribution taper pipe 101 is in sealing connection with the outer circumference of the round pipe 5-2, the hemispherical cover top 5-1 is arranged inside the water distribution taper pipe 101 and is positioned below the first air guide ring 102, a plurality of circles of small holes are arranged below the top of the hemispherical cover top 5-1, the side wall of the round pipe 5-2 is provided with a water inlet and an air inlet, the water inlet on the round pipe 5-2 is communicated with one end of the water inlet pipe 6, the other end of the water inlet pipe 6 is communicated with a water inlet pump 18, an air inlet pipe 12 penetrates through the air inlet on the round pipe 5-2, one end of the air inlet pipe 12 is arranged in the round pipe 5-2 and is connected with an aeration piece 11, the other end of the air inlet pipe 12 is arranged outside the round pipe 5-2 and is connected with an aerator 13, the aerator 13 is connected with a coil control device 14, the dissolved oxygen electrode 15 is arranged on the upper part of the main reaction pipe 103 and inside the main reaction pipe 103, the lower end of the round pipe 5-2 is communicated with one end of the larger pipe orifice of the conical mud storage hopper 5-3, the first air outlet pipe 7-7 penetrates through the side wall 7-7 and is connected with the small end of the small hole 9 arranged inside the round pipe 5-3, and is connected with the small end of the round pipe 8, which is arranged inside the round pipe 3 and is connected with the small end of the round pipe 8, which is arranged inside the round pipe 3 is connected with the small end of the round pipe 3;
The first conical gas collecting hood 4 is arranged inside the main reaction pipe 103 and is positioned above the first gas guide ring 102, the diameter of the larger end of the pipe orifice of the first conical gas collecting hood 4 is smaller than that of the main reaction pipe 103, the smaller end of the pipe orifice of the first conical gas collecting hood 4 is communicated with one end of the slender conduit 3, the slender conduit 3 is fixed inside the main reaction pipe 103 through a conduit bracket 17, a parabolic type guide hood 2 is arranged right above the other end of the slender conduit 3, the parabolic type guide hood 2 is fixed on the upper part of the main reaction pipe 103 through a guide hood bracket 16, and the opening area of the parabolic type guide hood 2 is 3 times of the cross section area of the slender conduit 3;
the diameter of the second exhaust pipe 113-1 is 5 times that of the third exhaust pipe 113-2;
a gap of 2cm is reserved between the second conical gas collecting hood 114 and the mud sinking taper pipe 105;
the dome bracket 16 and the conduit bracket 17 are provided with three supporting feet.
The aeration method for enhancing mass transfer of the upflow internal circulation micro-oxygen bioreactor comprises the following steps:
1. aerating:
the sewage enters the aeration chamber 5 from the water inlet pipe 6, air conveyed by the aerator 13 reaches the aeration member 11 through the air inlet pipe 12 and generates micro bubbles, the sewage and the micro bubbles are mixed in the aeration chamber 5 with limited space to oxygenate, the micro bubbles collide with each other and merge in the aeration chamber 5, part of the bubbles are discharged through the first exhaust pipe 7, and the rest of the bubbles enter the bottom of the micro-oxygen reactor shell 1 along with the sewage through a plurality of circles of small holes of the hemispherical hood top 5-1 at the upper end of the aeration chamber 5; the bottom of the micro-oxygen reactor shell 1 is provided with a microbial sludge bed layer; the microbial sludge bed layer is internally provided with aerobic microorganisms, anaerobic microorganisms, facultative aerobic microorganisms and facultative anaerobic microorganisms;
2. An internal recycle stream:
the bubbles and a part of the muddy water mixture continuously rise for 8cm and are collected by the first conical gas collecting hood 4, rise to the top of the slender conduit 3 in the slender conduit 3, change the fluid direction by the parabolic guide hood 2, the bubbles and a part of the muddy water mixture continuously move upwards, the other part of the muddy water mixture sinks and flows, the sunk muddy water mixture enters the first conical gas collecting hood 4 again, and a circulating flow from the center to the periphery of the main reaction tube 103 is formed in the main reaction tube 103;
3. monitoring:
the dissolved oxygen concentration in the up-flow internal circulation micro-aerobic bioreactor is obtained through the dissolved oxygen electrode 15 and is converted into an electric signal to be transmitted to the dissolved oxygen on-line control device 14 to dynamically adjust the aeration rate of the aerator 13, so that the aerobic microorganisms, the anaerobic microorganisms, the facultative aerobic microorganisms and the facultative anaerobic microorganisms in the up-flow internal circulation micro-aerobic bioreactor are in a micro-aerobic environment of 0.3mg/L to 0.5 mg/L.
The sewage in the first step is sewage which is produced in pig farms and contains carbon, nitrogen and phosphorus pollutants. The content of each pollutant in the sewage is stabilized in the following range for a long time: COD is 400mg/L to 1000mg/L, NH 4 -N is 200mg/L to 300mg/L, NO 3 -N is 0mg/L to 2mg/L, NO 2 N is 0-1 mg/L, and total phosphorus TP is 20-40 mg/L.
The use method of the upflow internal circulation micro-oxygen bioreactor comprises the following steps:
1. aerating:
the sewage enters the aeration chamber 5 from the water inlet pipe 6, air conveyed by the aerator 13 reaches the aeration member 11 through the air inlet pipe 12 and generates micro bubbles, the sewage and the micro bubbles are mixed in the aeration chamber 5 with limited space to oxygenate, the micro bubbles collide with each other and merge in the aeration chamber 5, part of the bubbles are discharged through the first exhaust pipe 7, the rest of the bubbles enter the bottom of the micro-oxygen reactor shell 1 along with the sewage from a plurality of circles of small holes of the hemispherical hood top 5-1 at the upper end of the aeration chamber 5, the proportion of the discharged bubbles is controlled to be within 30%, and the hydraulic retention time of the sewage in the upflow type internal circulation micro-oxygen bioreactor is controlled to be 8h; the bottom of the micro-oxygen reactor shell 1 is provided with a microbial sludge bed layer; the microbial sludge bed layer is internally provided with aerobic microorganisms, anaerobic microorganisms, facultative aerobic microorganisms and facultative anaerobic microorganisms;
2. an internal recycle stream:
the bubbles and a part of the muddy water mixture continuously rise for 8cm and are collected by the first conical gas collecting hood 4, the bubbles and a part of the muddy water mixture rise to the top of the elongated guide pipe 3 in the elongated guide pipe 3, the fluid direction is changed by the parabolic guide hood 2, the bubbles and a part of the muddy water mixture continuously move upwards, the other part of the muddy water mixture sinks and flows, the muddy water mixture which flows downwards enters the first conical gas collecting hood 4 again, a circulating flow from the center to the periphery of the main reaction pipe 103 is formed in the main reaction pipe 103, the bubbles which continuously move upwards are collected by the second conical gas collecting hood 114, the muddy water mixture which continuously moves upwards flows into the overflow pipe 106 through a gap with the length of 2cm between the second conical gas collecting hood 114 and the mud settling cone 105 for sedimentation, the clear water is discharged through the U-shaped drain pipe 107, and the mud flows back into the main reaction pipe 103 again along the inner wall of the mud settling cone 105;
3. Monitoring:
the dissolved oxygen concentration in the up-flow internal circulation micro-aerobic bioreactor is obtained through the dissolved oxygen electrode 15 and is converted into an electric signal to be transmitted to the dissolved oxygen on-line control device 14 to dynamically adjust the aeration rate of the aerator 13, so that the aerobic microorganisms, the anaerobic microorganisms, the facultative aerobic microorganisms and the facultative anaerobic microorganisms in the up-flow internal circulation micro-aerobic bioreactor are in a micro-aerobic environment of 0.3mg/L to 0.5 mg/L.
The sewage in the first step is generated in pig farms and containsSewage containing carbon, nitrogen and phosphorus pollutants. The content of each pollutant in the sewage is stabilized in the following range for a long time: COD is 400mg/L to 1000mg/L, NH 4 -N is 200mg/L to 300mg/L, NO 3 -N is 0mg/L to 2mg/L, NO 2 N is 0-1 mg/L, and total phosphorus TP is 20-40 mg/L.
The treatment effect is as follows: the COD of the treated pig farm sewage is less than or equal to 60mg/L, and NH 4 -N≤50mg/L，TN≤80mg/L，TP≤5mg/L。
Claims (6)
1. The upflow internal circulation micro-oxygen bioreactor is characterized in that: the upflow internal circulation micro-oxygen bioreactor consists of a micro-oxygen reactor shell (1), a parabolic guide hood (2), an elongated guide pipe (3), a first conical gas collecting hood (4), an aeration chamber (5), a water inlet pipe (6), a first exhaust pipe (7), an exhaust valve (8), a mud valve (9), a mud pipe (10), an aeration piece (11), an air inlet pipe (12), an aerator (13), a dissolved oxygen on-line control device (14), a dissolved oxygen electrode (15), a guide hood bracket (16), a guide pipe bracket (17) and a water inlet pump (18);
The micro-oxygen reactor shell (1) consists of a water distribution taper pipe (101), a first air guide ring (102), a main reaction pipe (103), a second air guide ring (104), a mud sinking taper pipe (105), an overflow pipe (106), a U-shaped drain pipe (107), a circular ring plate (108), an ultrahigh pipe (109), an annular flange plate (110), an annular flange pad (111), an equipment circular cover (112), a reducing exhaust pipe (113) and a second conical gas collecting hood (114);
the lower end of the main reaction tube (103) is communicated with one larger end of the water distribution taper tube (101), the upper end of the main reaction tube (103) is communicated with one smaller end of the mud sinking taper tube (105), one larger end of the mud sinking taper tube (105) is communicated with the lower end of the overflow tube (106), the upper end of the overflow tube (106) is provided with a saw tooth opening, the outer circumference of the overflow tube (106) is provided with a circular plate (108), the circular plate (108) is positioned below the saw tooth opening, the upper surface of the circular plate (108) is in sealing connection with the lower end of the ultrahigh tube (109), the upper end of the ultrahigh tube (109) is higher than the upper end of the overflow tube (106), the upper end of the ultrahigh tube (109) is provided with an annular flange plate (110), a plurality of flange holes are uniformly distributed on the annular flange plate (110), a circular cover (112) is arranged on the annular flange plate (110), the circular cover (112) is provided with flange holes with the same positions and numbers as the annular flange plate (110), and annular flange pads (111) are uniformly distributed between the annular flange plate (110) and the annular flange plate (112);
The inside of the upper end of the main reaction tube (103) is provided with a second air guide ring (104), and the inside of the lower end of the main reaction tube (103) is provided with a first air guide ring (102); the first air guide ring (102) and the second air guide ring (104) are circular rings, the cross section of each circular ring is triangular, and the inner diameter of the first air guide ring (102) is smaller than that of the second air guide ring (104);
the ring plate (108) is provided with a drain hole, and the drain hole on the ring plate (108) is communicated with the U-shaped drain pipe (107);
the diameter-variable exhaust pipe (113) consists of a second exhaust pipe (113-1) and a third exhaust pipe (113-2), the diameter of the second exhaust pipe (113-1) is larger than that of the third exhaust pipe (113-2), one end of the second exhaust pipe (113-1) is communicated with one smaller end of a pipe orifice of a second conical gas collecting cover (114), the other end of the second exhaust pipe (113-1) sequentially penetrates out of the center positions of the annular flange plate (110), the annular flange pad (111) and the equipment dome (112), and the end of the second exhaust pipe (113-1) penetrating out of the equipment dome (112) is communicated with one end of the third exhaust pipe (113-2);
one end of the second conical gas collecting hood (114) with a larger pipe orifice is positioned in the mud sinking taper pipe (105), and a gap is reserved between the second conical gas collecting hood (114) and the mud sinking taper pipe (105);
The aeration chamber (5) consists of a hemispherical cover top (5-1), a round tube (5-2) and a conical mud storage hopper (5-3); the upper end of the round tube (5-2) is provided with a hemispherical cover top (5-1), the smaller end of the tube orifice of the water distribution taper tube (101) is in sealing connection with the outer circumference of the round tube (5-2), the hemispherical cover top (5-1) is arranged in the water distribution taper tube (101) and is positioned below the first air guide ring (102), the lower part of the top of the hemispherical cover top (5-1) is provided with a plurality of circles of small holes, the side wall of the round tube (5-2) is provided with a water inlet and an air inlet, the water inlet on the round tube (5-2) is communicated with one end of the water inlet tube (6), the other end of the water inlet tube (6) is communicated with a water inlet pump (18), an air inlet tube (12) penetrates through the air inlet on the round tube (5-2), one end of the air inlet tube (12) is arranged in the round tube (5-2) and is connected with an aeration piece (11), the other end of the air inlet tube (12) is arranged outside the round tube (5-2) and is connected with an aerator (13), the aerator (13) is connected with an online control device (14), the dissolved oxygen control device (14) is provided with a dissolved oxygen electrode (15), the dissolved oxygen control device (103) is arranged in the dissolved oxygen electrode (15) and is arranged in the upper end of the main electrode (5-2) and is deeper than the main electrode (5) and is in the main electrode (3), the first exhaust pipe (7) penetrates through the side wall of the conical mud storage hopper (5-3), one end of the first exhaust pipe (7) is positioned in the hemispherical cover top (5-1), the end part of the first exhaust pipe is higher than a plurality of circles of small holes formed in the hemispherical cover top (5-1), the other end of the first exhaust pipe (7) is arranged outside the conical mud storage hopper (5-3) and connected with the exhaust valve (8), one smaller end of the pipe orifice of the conical mud storage hopper (5-3) is communicated with one end of the mud discharge pipe (10), and the other end of the mud discharge pipe (10) is communicated with the mud discharge valve (9);
The first conical gas collecting hood (4) is arranged in the main reaction tube (103) and is positioned above the first gas guide ring (102), the diameter of the larger end of the orifice of the first conical gas collecting hood (4) is smaller than that of the main reaction tube (103), the smaller end of the orifice of the first conical gas collecting hood (4) is communicated with one end of the slender conduit (3), the slender conduit (3) is fixed in the main reaction tube (103) through the conduit bracket (17), a parabolic type guide hood (2) is arranged right above the other end of the slender conduit (3), the parabolic type guide hood (2) is fixed on the upper part of the main reaction tube (103) through the guide hood bracket (16), and the opening area of the parabolic type guide hood (2) is more than 2 times the cross section area of the slender conduit (3);
the aeration method for enhancing mass transfer of the upflow internal circulation micro-oxygen bioreactor comprises the following steps:
1. aerating:
the sewage enters an aeration chamber (5) from a water inlet pipe (6), air conveyed by an aerator (13) reaches an aeration member (11) through an air inlet pipe (12) and generates micro bubbles, the sewage and the micro bubbles are mixed in the aeration chamber (5) with limited space to oxygenate, the micro bubbles collide and merge with each other in the aeration chamber (5), part of the air bubbles are discharged through a first exhaust pipe (7), and the rest of the air bubbles enter the bottom of a micro-oxygen reactor shell (1) along with the sewage from a plurality of circles of small holes on a hemispherical cover top (5-1) at the upper end of the aeration chamber (5); the bottom of the micro-oxygen reactor shell (1) is provided with a microbial sludge bed layer; the microbial sludge bed layer is internally provided with aerobic microorganisms, anaerobic microorganisms, facultative aerobic microorganisms and facultative anaerobic microorganisms;
2. An internal recycle stream:
the bubbles and a part of the muddy water mixture continuously rise and are collected by the first conical gas collecting hood (4), rise to the top of the slender conduit (3) in the slender conduit (3), change the fluid direction by the parabolic type guide hood (2), the bubbles and a part of the muddy water mixture continuously move upwards, the other part of the muddy water mixture sinks and flows, the sunk muddy water mixture enters the first conical gas collecting hood (4) again, and a circulating flow from the center to the periphery of the main reaction tube (103) is formed in the main reaction tube (103);
3. monitoring:
the dissolved oxygen concentration in the up-flow internal circulation micro-organism reactor is obtained through a dissolved oxygen electrode (15) and converted into an electric signal to be transmitted to a dissolved oxygen on-line control device (14) to dynamically adjust the aeration rate of an aerator (13), so that aerobic microorganisms, anaerobic microorganisms, facultative aerobic microorganisms and facultative anaerobic microorganisms in the up-flow internal circulation micro-organism reactor are in a micro-aerobic environment of 0.3mg/L to 0.5 mg/L;
the use method of the upflow internal circulation micro-aerobic bioreactor comprises the following steps:
1. aerating:
the sewage enters an aeration chamber (5) from a water inlet pipe (6), air conveyed by an aerator (13) reaches an aeration piece (11) through an air inlet pipe (12) and generates micro bubbles, the sewage and the micro bubbles are mixed in the aeration chamber (5) with limited space to cause oxygenation, the micro bubbles collide and merge with each other in the aeration chamber (5), the bubbles are discharged out of a part of the sewage through a first exhaust pipe (7), the rest of the bubbles enter the bottom of a micro-oxygen reactor shell (1) along with the sewage from a plurality of circles of small holes on a hemispherical cover top (5-1) at the upper end of the aeration chamber (5), the proportion of discharged bubbles is controlled to be within 30%, and the hydraulic retention time of the sewage in an upflow type internal circulation micro-oxygen bioreactor is controlled to be 6-8 h; the bottom of the micro-oxygen reactor shell (1) is provided with a microbial sludge bed layer; the microbial sludge bed layer is internally provided with aerobic microorganisms, anaerobic microorganisms, facultative aerobic microorganisms and facultative anaerobic microorganisms;
2. An internal recycle stream:
the bubbles and a part of the muddy water mixture continuously rise and are collected by the first conical gas collecting hood (4), rise to the top of the slender conduit (3) in the slender conduit (3), change the fluid direction by the parabolic type air guide hood (2), the bubbles and a part of the muddy water mixture continuously move upwards, and the other part of the muddy water mixture sinks and flows, the sunk muddy water mixture enters the first conical gas collecting hood (4) again, a circulating flow from the center to the periphery of the main reaction tube (103) is formed in the main reaction tube (103), the bubbles continuously moving upwards are collected by the second conical gas collecting hood (114), the muddy water mixture continuously moving upwards flows into the overflow tube (106) through a gap between the second conical gas collecting hood (114) and the sunk mud cone (105) to be precipitated, the clear water is discharged through the U-shaped drain tube (107), and the mud is re-circulated into the main reaction tube (103) along the inner wall of the sunk mud cone (105);
3. monitoring:
the dissolved oxygen concentration in the up-flow internal circulation micro-organism reactor is obtained through a dissolved oxygen electrode (15) and converted into an electric signal which is transmitted to an dissolved oxygen on-line control device (14) to dynamically adjust the aeration rate of an aerator (13), so that the aerobic microorganisms, the anaerobic microorganisms, the facultative aerobic microorganisms and the facultative anaerobic microorganisms in the up-flow internal circulation micro-organism reactor are in a micro-aerobic environment of 0.3mg/L to 0.5 mg/L.
2. The upflow internal circulation micro-aerobic bioreactor according to claim 1, wherein: the opening area of the parabolic air guide sleeve (2) is 2-4 times of the cross section area of the slender conduit (3).
3. The upflow internal circulation micro-aerobic bioreactor according to claim 1, wherein: a gap of 1.5 cm-2 cm is reserved between the second conical gas collecting hood (114) and the mud sinking taper pipe (105).
4. The upflow internal circulation micro-aerobic bioreactor according to claim 1, wherein: the upper parts of the water distribution taper pipe (101) and the main reaction pipe (103) are respectively provided with a reflux port, a reflux pipe is connected between the reflux ports, and a reflux pump is arranged on the reflux pipe.
5. The upflow internal circulation micro-aerobic bioreactor according to claim 1, wherein: the upper parts of the aeration chamber (5) and the main reaction pipe (103) are respectively provided with a reflux port, a reflux pipe is connected between the reflux ports, and a reflux pump is arranged on the reflux pipe.
6. The upflow internal circulation micro-aerobic bioreactor according to claim 1, wherein: in the first step, the hydraulic retention time of the sewage in the upflow internal circulation micro-oxygen bioreactor is controlled to be 8 hours.
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