CN109825423B - Internal circulation bioreactor - Google Patents

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 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, production and collection of biogas.

Background technique

Anaerobic digestion is a process in which organic matter is degraded by anaerobic microorganisms under anaerobic conditions and biogas is produced. Biogas is a mixed gas containing a variety of gas components, in which the content of methane is 50% to 70%, the content of carbon dioxide is 25% to 40%, and the total volume of other gases is about 2%. Biogas can be burned, and the purified methane can be used directly as natural gas. Anaerobic digestion is widely used in the treatment of industrial and agricultural organic waste because it can efficiently process a variety of complex organic matter and generate energy gas.

Anaerobic reactor is the key device of anaerobic digestion reaction. The efficiency of anaerobic digestion, gas production rate, energy consumption and construction cost are all important factors affecting the selection of anaerobic reactor. Continuous research and innovation on anaerobic reactors is the key to improving the efficiency of anaerobic digestion reactions. The development of anaerobic digestion reactors has also gone through different stages, the first generation of anaerobic reactors, including conventional anaerobic reactor (CADT), total mixed reactor (CSTR), and anaerobic contact digester (ACP) ), the reactor at this stage is characterized by relatively simple structure, small investment, and relatively simple operation and management. Poor and other disadvantages. The second generation of anaerobic reactors, including anaerobic filter (AF), up-flow anaerobic sludge bed reactor (UASB), anaerobic baffled reactor (ABR), these reactors have high treatment efficiency, resistance to It has the characteristics of strong load capacity and good effluent quality. It is suitable for organic wastewater with relatively low SS content, but it also has disadvantages such as large investment and high equipment operation and maintenance costs. The third generation of anaerobic reactors, including expanded granular sludge bed reactor (EGSB), internal circulation anaerobic reactor (IC), up-flow sludge bed reactor (UBF), etc., these reactors have high treatment efficiency , strong load bearing capacity, good effluent quality and other characteristics, but the investment in equipment is relatively large, and the requirements for SS content in wastewater are strict. Therefore, it is necessary to comprehensively consider various factors such as the characteristics of organic wastewater, investment scale, treatment costs, and benefits, and reasonably select an appropriate anaerobic reactor. The transformation and innovation of the anaerobic reactor should retain the advantages of the original reactor, reduce the shortcomings and disadvantages of the reactor, and also consider the cost and cost of the equipment.

Due to its simple structure, full contact between raw materials and substrates, high fermentation rate, high volumetric gas production rate, simple operation and management, and low energy consumption, the Total Mixed Reactor (CSTR) is still widely used in various industrial and agricultural industries. Concentration, high suspended solids, refractory organic wastewater treatment. But at the same time, the main disadvantage of this process is that the hydraulic retention time and the solid retention time cannot be separated, the sludge retention time is equal to the hydraulic retention time, and the sludge of sufficient concentration cannot be accumulated in the reactor. Poor gas escape. Since sludge with sufficient concentration cannot be accumulated, the SS concentration of the material is also limited to a certain extent, which narrows the application scope of the process.

SUMMARY OF THE INVENTION

The present invention is aimed at the above technical problems, and provides a kind of internal circulation type bioreactor with built-in baffle plate and stirring.

The present invention realizes above-mentioned purpose through following technical scheme:

The internal circulation bioreactor includes a feed pipe, a discharge pipe, a gas collecting pipe, an impeller, a baffle, a flow guiding device, a reactor body, a three-phase separator, and a fender, and is characterized in that the bottom of the reactor body is provided with Feed pipe, the upper part of the reactor body is provided with a discharge pipe, the top of the reactor body is conical, the gas collecting pipe is arranged on the top of the reactor body, the reactor body is provided with a baffle plate, and the baffle plate is formed into a column shape inside the reactor body Space, the upper part of the partition is provided with a mudguard, the lower part of the partition is an inverted cone frustum and a plurality of channels are arranged at the bottom, so that the columnar space enclosed by the partition is communicated with the outside; An impeller is arranged below the flow guiding device, and a three-phase separator is arranged on the upper part of the inner side of the reactor body. The position of the three-phase separator is lower than the discharge port. overlapping. The feed pipe can be connected with the mud discharge pipe to realize the mud discharge function. A water distributor is symmetrically arranged around the bottom of the reactor body. The reactor body is composed of one or more of plastic, metal, and concrete structures. The cross section of the reactor body is circular or rectangular. The angle between the fender and the horizontal plane is 10° to 45°. The guide device is composed of a central shaft and blades, and the blades are arranged on the central shaft at an upward angle of 45° to 60°.

Under the action of the impeller and the middle guide device in the internal circulation bioreactor of the present invention, the material in the baffle is in a downward flow state, and passes through the bottom of the baffle driven by the impeller and the blades on the guide device. The channel enters the outside of the baffle, and mixes with the material outside the baffle and flows upward, so that the material can realize the effect of internal and external circulation mixing with the outside of the baffle upward and the inside of the baffle downward, which improves the mass transfer. Efficiency and organic load improve the residence time of sludge and effluent quality, and improve the scope of application of sewage treatment (such as low SS). Separation increases mass transfer and improves gas production efficiency.

In actual use, the fermentation material is injected from the feed pipe at the bottom of the reactor body, evenly distributed at the bottom through the water distributor, mixed with the sludge driven by the impeller and internal fluid, fermented and produced biogas, and the biogas drives the feed liquid to rise And gather at the three-phase separator, the biogas passes through the three-phase separator to the gas gathering area at the top, and part of the feed liquid passes through the three-phase separator to the upper part of the separator, and then completes the cycle under the drive of the diversion device. The sludge is retained, and part of the material liquid circulates with the sludge in the lower part of the three-phase separator.

The beneficial effects of the present invention are:

(1) The local circulation of the material outside the separator and the internal circulation inside and outside the separator increase the mixing and mass transfer of the material, improve the full contact between the sludge and the material, and it is not easy to form crusts on the upper layer of the liquid surface of the reactor body. Foaming and other problems have improved the gas-liquid separation efficiency of biogas.

(2) A three-phase separator is added on the upper part of the reactor body to realize the three-phase separation of solid, liquid and gas, increase the retention of sludge, improve the residence time of sludge, and improve the treatment efficiency. For wastewater with low solid content It also has a good treatment effect, and does not need to supplement sludge, which expands the scope of application, such as low SS wastewater, and reduces the cost of sludge supplementation.

(3) The water distribution pipe at the bottom can disperse the deposited sludge while feeding, which is of great 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.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention, wherein:

1—Feed pipe, 2—Discharge pipe, 3—Gas collection pipe, 4—Impeller, 5—Clapboard, 6—Guide device, 7—Reactor body, 8—Three-phase separator, 9—Fender .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work, all belong to the protection scope of the present invention.

The internal circulation type bioreactor includes a feed pipe 1, a discharge pipe 2, a gas collecting pipe 3, an impeller 4, a baffle 5, a flow guiding device 6, a reactor body 7, a three-phase separator 8, and a fender 9, It is characterized in that the bottom of the reactor body 7 is provided with a feed pipe 1, the upper part of the reactor body 7 is provided with a discharge pipe 2, the top of the reactor body 7 is conical, the gas collecting pipe 3 is arranged on the top of the reactor body 7, and the reactor body 7 is provided with a baffle 5, the baffle 5 encloses a columnar space inside the reactor body 7, the upper part of the baffle 5 is provided with a fender 9, the lower part of the baffle 5 is an inverted cone frustum and a plurality of channels are arranged at the bottom, so that the The columnar space enclosed by the clapboard 5 is communicated with the outside, a flow guide device 6 is arranged on the central axis of the clapboard 5, an impeller 4 is provided below the flow guide device 6, and a three-phase separator 8 is arranged on the upper part of the inner side of the reactor body 7, and the three-phase separator The position of the phase separator 8 is lower than the discharge port, and the fender 9 extends above the three-phase separator 8 and partially overlaps with the three-phase separator 8 . The feed pipe 1 can be connected with the mud discharge pipe to realize the mud discharge function. A water distributor is symmetrically arranged around the inner bottom of the reactor body 7. The reactor body 7 is composed of one or more of plastic, metal and concrete structures. The cross section of the reactor body 7 is circular or rectangular. The included angle between the fender 9 and the horizontal plane is 10° to 45°. The flow guiding device 6 is composed of a central shaft and blades, and the blades are arranged on the central shaft upward at an included angle of 45° to 60° with the horizontal plane.

Under the action of the impeller 4 and the middle guide device 6 in the internal circulation bioreactor according to the present invention, the material in the partition plate 5 is in a downward flow state. It enters the outside of the partition 5 through the channel at the bottom of the partition 5, and mixes with the material outside the partition 5 and presents an upward flow state, so that the material on the outside of the partition 5 faces upward and the inside of the partition 5 faces downward. The effect of internal and external circulation mixing improves the residence time and mass transfer efficiency of sludge, and improves the scope of application of sewage treatment (for example, low SS). The gas-liquid separation of liquid increases mass transfer and improves gas production efficiency.

The reactor body 7 is divided into three areas by the built-in baffle 5 and the fender 9 on the upper part of the baffle 5: 1. Gas collection area: the space at the upper part of the reactor body 7 is used to collect the biogas produced by the reactor; 2. Settlement zone: the material and liquid inside and on the upper part of the partition plate 5 flows downward under the driving of the lower impeller 4 and the guide device 6; Driven by the biogas from the impeller 4 and the biogas generated at the bottom flows clockwise, the right side area separated by the partition 5 is driven by the impeller 4 and the biogas generated at the bottom to flow counterclockwise, and the biogas generated in the areas on both sides is separated under the action of the three-phase separator 8 out, while the sludge is trapped.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (1)

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.

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