CN109825423B

CN109825423B - Internal circulation type bioreactor

Info

Publication number: CN109825423B
Application number: CN201910020554.0A
Authority: CN
Inventors: 赵全保
Original assignee: Dewo Suzhou Environment Technology Co ltd
Current assignee: Dewo Suzhou Environment Technology Co ltd
Priority date: 2019-01-09
Filing date: 2019-01-09
Publication date: 2022-04-29
Anticipated expiration: 2039-01-09
Also published as: CN109825423A

Abstract

The invention discloses an internal circulation bioreactor, which comprises a feeding pipe, a discharging pipe, a gas collecting pipe, an impeller, a clapboard, a flow guide device, a reactor body, a three-phase separator and a mudguard, wherein under the action of the impeller and the middle flow guide device, materials in the clapboard are in a downward flow state, enter the outside of the clapboard through a channel at the bottom of the clapboard under the driving of blades on the impeller and the flow guide device, are mixed with the materials outside the clapboard and are in an upward flow state, so that the materials are subjected to the effect of internal and external circulation mixing from the outside of the clapboard to the inside of the clapboard, the mass transfer efficiency and the organic load are improved, the retention time of sludge and the effluent water quality are improved, the application range (such as low SS) of sewage treatment is improved, and simultaneously, the gas-liquid separation of methane and feed liquid is realized under the action of the three-phase separator at the upper part of the reactor body, increases mass transfer and improves gas production efficiency.

Description

Internal circulation type bioreactor

Technical Field

The invention relates to the field of microbial anaerobic treatment and biogas generation, in particular to an internal circulation type bioreactor which can be used for anaerobic treatment of organic wastes, and biogas production and collection.

Background

The anaerobic digestion reaction refers to a process in which organic matters are degraded by anaerobic microorganisms under anaerobic conditions and methane gas is produced. The biogas is a mixed gas containing a plurality of gas components, wherein the content of methane is 50-70%, the content of carbon dioxide is 25-40%, and the total volume of other gases is about 2%. The biogas can be combusted, and the purified methane can be directly used as natural gas. Anaerobic digestion reaction can efficiently treat various complex organic matters and generate energy gas, so the anaerobic digestion reaction is widely applied to the treatment of industrial and agricultural organic waste gas.

The anaerobic reactor is a key device for anaerobic digestion reaction, the anaerobic digestion efficiency is high and low, and the gas production speed, the energy consumption and the manufacturing cost are all important factors influencing the type selection of the anaerobic reactor. The continuous research and innovation of the anaerobic reactor is the key for improving the anaerobic digestion reaction efficiency. The development of anaerobic digestion reactors also passes through different stages, the first generation of anaerobic reactors comprises a conventional anaerobic reactor (CADT), a fully mixed reactor (CSTR) and an anaerobic contact digester (ACP), and the reactor at this stage has the characteristics of simple general structure, small investment, simple operation management and the like, is suitable for organic wastewater with high concentration or high suspended matters, but has the defects of long hydraulic retention time, poor water quality of yielding water and the like. The second generation anaerobic reactor comprises an Anaerobic Filter (AF), an upflow anaerobic sludge blanket reactor (UASB) and an Anaerobic Baffled Reactor (ABR), and the reactors have the characteristics of high treatment efficiency, strong load resistance, good effluent quality and the like, are suitable for organic wastewater with relatively low SS content, but also have the defects of large investment, high equipment operation and maintenance cost and the like. The third generation anaerobic reactor comprises an expanded granular sludge bed reactor (EGSB), an internal circulation anaerobic reactor (IC), an upflow sludge bed reactor (UBF) and the like, and the reactors have the characteristics of high treatment efficiency, strong load-bearing capacity, good effluent quality and the like, but the investment of equipment is relatively large, and the requirement on the SS content of wastewater is strict. Therefore, the characteristics of the organic wastewater, the investment scale, the treatment cost, the income and other factors need to be comprehensively considered, and a proper anaerobic reactor needs to be reasonably selected. The improvement and innovation of the anaerobic reactor should keep the advantages of the original reactor, reduce the disadvantages and drawbacks of the reactor, and consider the cost of equipment.

The full mixing reactor (CSTR) is still widely applied to the treatment of various organic wastewater with high concentration, high suspended matter and difficult degradation in the industry and agriculture due to the characteristics of simple structure, full contact between the raw materials and the substrate, high fermentation rate, high volumetric gas production rate, simple operation and management, low energy consumption and the like. However, the main disadvantage of this process is that the hydraulic retention time and the solids retention time cannot be separated, the sludge retention time is equal to the hydraulic retention time, sludge of sufficient concentration cannot be accumulated in the reactor, and in addition, scum on the surface layer is easy to crust, resulting in unsmooth gas overflow. Because sludge with enough concentration can not be accumulated, the SS concentration of the material is limited to a certain extent, and the application range of the process is narrowed.

Disclosure of Invention

The invention provides an internal circulation type bioreactor with a built-in baffle and stirring aiming at the technical problems.

The invention realizes the purpose through the following technical scheme:

an internal circulation bioreactor comprises a feed pipe, a discharge pipe, a gas collecting pipe, an impeller, a clapboard, a flow guiding device, a reactor body, a three-phase separator and a mudguard, the reactor is characterized in that a feeding pipe is arranged at the bottom of the reactor body, a discharging pipe is arranged at the upper part of the reactor body, the top of the reactor body is in a cone shape, the gas collecting pipe is arranged at the top of the reactor body, a partition plate is arranged in the reactor body and surrounds the reactor body into a columnar space, a fender is arranged at the upper part of the partition plate, the lower part of the partition plate is in an inverted cone shape, a plurality of channels are arranged at the bottom of the partition plate, the columnar space surrounded by the partition plate is communicated with the outside, a flow guide device is arranged at the middle shaft position of the partition plate, an impeller is arranged below the flow guide device, a three-phase separator is arranged at the upper part of the inner side of the reactor body, the position of the three-phase separator is lower than a discharge port, and the fender extends into the upper part of the three-phase separator and is partially overlapped with the three-phase separator. The inlet pipe can be connected with the mud pipe and realize the mud function. Water distributors are symmetrically arranged around the bottom of the reactor body. The reactor body is formed by combining one or more of plastic, metal and concrete structures. The cross section of the reactor body is circular or rectangular. The included angle between the mudguard and the horizontal plane is 10-45 degrees. The flow guide device consists of a central shaft and blades, wherein the blades are upwards arranged on the central shaft at an angle of 45-60 degrees.

The internal circulation bioreactor is characterized in that the inner side of the baffle plate is provided with a plurality of blades, the blades are arranged on the blades, and the blades are arranged on the blades and are driven by the blades to enter the outer part of the baffle plate through a channel at the bottom of the baffle plate and are mixed with the materials outside the baffle plate to form an upward flow state, so that the materials are circularly mixed inside and outside the baffle plate and face downwards outside the baffle plate, the mass transfer efficiency and the organic load are improved, the retention time of sludge and the effluent quality are improved, the application range (such as low SS) of sewage treatment is improved, and simultaneously, the gas-liquid separation of biogas and feed liquid is realized under the action of a three-phase separator on the upper part of the reactor body, the mass transfer is increased, and the gas production efficiency is improved.

In actual use, fermentation materials are injected from a feeding pipe at the bottom of a reactor body, are uniformly distributed at the bottom through a water distributor, are mixed with sludge under the drive of an impeller and internal fluid, are fermented to generate biogas, the biogas drives feed liquid to rise and gather at a three-phase separator, the biogas penetrates through the three-phase separator to reach a gas collection area at the top, part of the feed liquid penetrates through the three-phase separator to reach the upper part of a partition plate, then circulation is completed under the drive of a flow guide device, most of sludge is intercepted, and part of the feed liquid flows along with the sludge in the lower part of the three-phase separator in a circulating manner.

The invention has the beneficial effects that:

(1) the partial circulation of the materials outside the partition plate and the internal circulation inside and outside the partition plate increase the mixing and mass transfer of the materials, improve the full contact of the sludge and the materials, prevent the problems of crusting, foaming and the like on the upper layer of the liquid level of the reactor body, and improve the gas-liquid separation efficiency of the methane.

(2) The reactor has the advantages that the three-phase separator is additionally arranged on the upper part of the reactor body, so that the three-phase separation of solid, liquid and gas is realized, the interception of sludge is increased, the retention time of the sludge is prolonged, the treatment efficiency is improved, the wastewater with lower solid content has a good treatment effect, the sludge does not need to be supplemented, the application range is expanded, and the cost of sludge supplementation is reduced if the wastewater with low SS content is used.

(3) The water distribution pipe at the bottom can disperse the deposited sludge while feeding, and has important significance for improving the sludge activity, reducing the dead sludge area, increasing the treatment efficiency of the reactor body and reducing the hydraulic retention time.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention, in which:

1-inlet pipe, 2-outlet pipe, 3-gas collecting pipe, 4-impeller, 5-clapboard, 6-guiding device, 7-reactor body, 8-three-phase separator, 9-mudguard.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An internal circulation type bioreactor comprises a feeding pipe 1, a discharging pipe 2, a gas collecting pipe 3, an impeller 4, a partition plate 5, a flow guide device 6, a reactor body 7, a three-phase separator 8 and a fender 9, and is characterized in that the feeding pipe 1 is arranged at the bottom of the reactor body 7, the discharging pipe 2 is arranged at the upper part of the reactor body 7, the top of the reactor body 7 is conical, the gas collecting pipe 3 is arranged at the top of the reactor body 7, the partition plate 5 is arranged in the reactor body 7, the partition plate 5 encloses a columnar space in the reactor body 7, the fender 9 is arranged at the upper part of the partition plate 5, the lower part of the partition plate 5 is an inverted frustum and is provided with a plurality of channels at the bottom, the columnar space enclosed by the partition plate 5 is communicated with the outside, the flow guide device 6 is arranged at the middle shaft position of the partition plate 5, the impeller 4 is arranged below the flow guide device 6, the three-phase separator 8 is arranged at the upper part of the inner side of the reactor body 7, the three-phase separator 8 is disposed at a position lower than the discharge port, and the splash guard 9 extends above the three-phase separator 8 and partially overlaps the three-phase separator 8. The feeding pipe 1 can be connected with a sludge discharge pipe to realize the sludge discharge function. Water distributors are symmetrically arranged around the bottom in the reactor body 7. The reactor body 7 is made of one or a plurality of plastic, metal and concrete structures. The cross section of the reactor body 7 is circular or rectangular. The included angle between the mudguard 9 and the horizontal plane is 10-45 degrees. The flow guide device 6 consists of a central shaft and blades, and the blades and the horizontal plane form an included angle of 45-60 degrees and are upwards arranged on the central shaft.

The internal circulation bioreactor is characterized in that under the action of the impeller 4 and the middle flow guide device 6, materials in the partition plate 5 are in a downward flow state, enter the outside of the partition plate 5 through the channel at the bottom of the partition plate 5 under the driving of the impeller 4 and the blades on the flow guide device 6, are mixed with the materials outside the partition plate 5 and are in an upward flow state, so that the materials are circularly mixed inside and outside the partition plate 5 and upward outside the partition plate 5, the retention time and the mass transfer efficiency of sludge are improved, the application range (such as low SS) of sewage treatment is improved, and simultaneously, gas-liquid separation of methane and feed liquid is realized under the action of the three-phase separator 8 at the upper part of the reactor body 7, the mass transfer is increased, and the gas production efficiency is improved.

The reactor body 7 is divided into three areas by the built-in partition plate 5 and a mudguard 9 on the upper part of the partition plate 5: 1. a gas collection area: the space at the upper part of the reactor body 7 is used for collecting the methane generated by the reactor; 2. a settling zone: the feed liquid in and above the partition plate 5 flows downwards under the drive of the lower impeller 4 and the flow guide device 6; 3. a circulation zone: the left area separated by the partition board 5 flows clockwise under the drive of the impeller 4 and the methane generated at the bottom, the right area separated by the partition board 5 flows anticlockwise under the drive of the impeller 4 and the methane generated at the bottom, the methane generated at the two side areas is separated out under the action of the three-phase separator 8, and simultaneously the sludge is intercepted.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description of the embodiments is for clarity only, and those skilled in the art should make the description as a whole, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An internal circulation bioreactor comprises a feeding pipe, a discharging pipe, a gas collecting pipe, an impeller, a partition plate, a flow guide device, a reactor body, a three-phase separator and a fender, and is characterized in that the feeding pipe is arranged at the bottom of the reactor body, the discharging pipe is arranged at the upper part of the reactor body, the top of the reactor body is conical, the gas collecting pipe is arranged at the top of the reactor body, the partition plate is arranged in the reactor body, the partition plate encloses a columnar space in the reactor body, the fender is arranged at the upper part of the partition plate, the lower part of the partition plate is an inverted cone and is provided with a plurality of channels at the bottom, so that the columnar space enclosed by the partition plate is communicated with the outside, the flow guide device is arranged at the middle shaft position of the partition plate, the impeller is arranged below the flow guide device, the three-phase separator is arranged at the upper part of the inner side of the reactor body, the position where the three-phase separator is arranged is lower than the discharge port, and the fender extends into the upper part of the three-phase separator and is overlapped with the three-phase separator, the inlet pipe can be connected with the mud pipe and realize the mud function of arranging, be provided with the water-locator around the bottom in the reactor body symmetrically, the reactor body is formed by one or more combination in plastics, metal, the concrete structure, reactor body cross section is circular or rectangle, the contained angle of fender and horizontal plane is 30, guiding device comprises center pin, blade, the blade is 45 and sets up on the center pin.