CN219469813U - Jet loop reactor - Google Patents

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly relates to an injection circulation reaction device. The jet loop reactor of the utility model is used for denitrification treatment of landfill leachate and comprises: the garbage leachate treatment device comprises a water inlet unit, a water discharge unit, a circulating unit, an injection unit, a bioreactor and a controller, wherein the controller controls each unit to work cooperatively, the denitrification treatment of garbage leachate is completed, and all the processes of the denitrification treatment are carried out in the bioreactor, so that the technical problems that the garbage leachate device in the prior art is complex in structure and low in automation control degree are solved.

Description

Jet loop reactor

Technical Field

The utility model belongs to the technical field of sewage treatment, and particularly relates to an injection circulation reaction device.

Background

Garbage can be piled up or buried to generate garbage percolate, and the garbage percolate is special wastewater with high organic matter, ammonia nitrogen and inorganic salt content. Wherein the ammonia nitrogen content increases with the increase of the years of landfill, if the ammonia nitrogen is directly discharged into the water body, serious harm is caused to the environment, and the ammonia nitrogen in the water is mainly NH ⁺ ₄ -N. The jet circulation is a novel high-efficiency and economical wastewater treatment technology which utilizes the jet action of a pump to circulate liquid and fully mixes momentum transfer between liquid and gas, has good denitrification efficiency under aerobic conditions and is widely applied to the fields of chemical industry, biology and environmental protection. In the process of treating sewage by a biological method, the jet loop reactor utilizes the two-phase nozzle to shear biological flocs in the sewage into small biological fragments, so that the contact area among micro bubbles, microorganisms and the sewage is greatly increased, the problem of limited oxygen mass transfer in the sewage treatment process is solved, and the sewage treatment efficiency is improved.

The treatment device of the landfill leachate in the prior art comprises a preposed denitrification tank, a jet loop reaction tank, a degassing tank, a sedimentation tank and other reactors, wherein the preposed denitrification tank is used for carrying out anaerobic denitrification reaction, the jet loop reaction tank is used for carrying out aerobic nitrification process, the degassing tank is used for carrying out degassing process, and the sedimentation tank is used for carrying out sedimentation and mud-water separation process. Different treatments are carried out in different reactors, and corresponding piping devices are required to be connected between each reactor. For the related technology, a plurality of reactors and a plurality of pipelines are connected, so that the device is complex, the automatic control of the device is complex and the implementation difficulty is high.

Disclosure of Invention

The utility model mainly aims to provide an injection circulation reaction device, which aims to solve the technical problems of complex structure and low automatic control degree of a landfill leachate device in the prior art.

In order to achieve the above object, the present utility model provides an jet loop reactor for denitrification treatment of landfill leachate, comprising:

the bioreactor comprises a reactor body, wherein the reactor body is provided with a water inlet, a water outlet and a circulating water inlet, garbage percolate flows into the reactor body through the water inlet for denitrification treatment and is discharged from the water outlet, and the denitrification treatment comprises a circulating aeration stage and an anaerobic degassing stage;

one end of the injection unit is connected with an external air source, and the other end of the injection unit is inserted into the reactor body; and

one end of the circulating unit is communicated with the circulating water inlet, and the other end of the circulating unit is communicated with the spraying unit;

in the cyclic aeration stage, the spraying unit is opened for ventilation, and liquid in the reactor body enters the spraying unit after being circulated by the circulating unit and is sprayed after being mixed with air;

in the anaerobic degassing stage, the spraying unit stops ventilation, and the liquid in the reactor body is sprayed out of the spraying unit after being circulated by the circulating unit.

In the embodiment of the utility model, the reactor body comprises a guide cylinder and an outer cylinder which are nested and communicated in sequence from inside to outside, the water inlet, the water outlet and the circulating water inlet are all arranged on the outer cylinder, and the jet unit is inserted into the guide cylinder.

In the embodiment of the utility model, the outer cylinder is provided with the overflow port, and the horizontal plane of the overflow port is higher than that of the water outlet.

In the embodiment of the utility model, the circulating unit comprises a circulating pipe and a circulating pump, the circulating pump is arranged on the circulating pipe, the liquid inlet end of the circulating pipe is communicated with the circulating water inlet, the liquid outlet end of the circulating pipe is communicated with the spraying unit, the circulating water inlet is positioned in the middle of the outer cylinder, and the horizontal plane of the circulating water inlet is lower than the horizontal plane of the water outlet.

In the embodiment of the utility model, the spraying unit comprises a two-phase nozzle, an air pipe and an air pump, wherein the air inlet end of the air pipe is connected with the air pump, the two-phase nozzle is inserted into the guide cylinder, two connectors are arranged on the two-phase nozzle, one connector is communicated with the air outlet end of the air pipe, and the other connector is communicated with the circulating pipe.

In the embodiment of the utility model, the two-phase nozzle comprises an access section and an ejection section, wherein the access section is cylindrical, the ejection section is in a circular truncated cone shape, and the included angle between the extension line of the access section and the bus of the ejection section is 16-18 degrees.

In the embodiment of the utility model, the outer cylinder is provided with a connecting bracket which is detachably connected with the two-phase nozzle.

In an embodiment of the utility model, the jet loop reaction device further comprises a water inlet unit and a water discharge unit, the water inlet unit being in communication with the water inlet and the water discharge unit being in communication with the water discharge outlet.

In the embodiment of the utility model, the water inlet unit comprises a water inlet pipe and a water inlet pump, the liquid outlet end of the water inlet pipe is communicated with the water inlet, and the liquid inlet end is connected with the water inlet pump; the drainage unit comprises a drainage pipe and a drainage valve arranged on the drainage pipe, and the liquid inlet end of the drainage pipe is communicated with the drainage port.

In an embodiment of the utility model, the jet loop reactor further comprises a controller and a liquid level sensor electrically connected with the controller, wherein the liquid level sensor is arranged on the outer cylinder and is used for detecting the liquid level of the liquid in the outer cylinder and sending out a liquid level signal at the same time, and the controller receives the liquid level signal and controls the circulating pump, the air pump, the water inlet pump and the water outlet valve to work.

Through the technical scheme, the jet loop reaction device provided by the embodiment of the utility model has the following beneficial effects:

the utility model provides a jet circulation reaction device for denitrification treatment of landfill leachate, which comprises a bioreactor, a jet unit and a circulation unit, wherein the specific treatment process comprises a circulation aeration stage and an anaerobic degassing stage. All stages of the whole reaction process are carried out in the bioreactor, and the injection unit and the circulation unit are connected with the bioreactor to complete the whole sewage treatment process, so that the problems that the number of reactors and the number of connecting pipelines are large due to the fact that different reactions are carried out in different reactors are solved, and a reaction device is simplified; the difficulty of automatic control and implementation of the device is reduced.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide an understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the description serve to explain, without limitation, the utility model. In the drawings:

FIG. 1 is a schematic diagram of the structure of an injection loop reactor according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a controller according to an embodiment of the present utility model.

Description of the reference numerals

Reference numerals	Name of the name	Reference numerals	Name of the name
				1	Bioreactor	22	Air pipe
11	Reactor body	23	Air pump
				111	Guide cylinder	3	Circulation sheetMeta
112	Outer cylinder	31	Circulation pipe
				12	Water inlet	32	Circulation pump
13	Water outlet	4	Connecting support
				14	Circulation water inlet	5	Water inlet unit
15	Overflow port	51	Water inlet pipe
				16	Emptying port	52	Water inlet pump
2	Jet unit	6	Drainage unit
				21	Two-phase nozzle	61	Drain pipe
211	Access segment	62	Drain valve
				212	Ejection section	7	Controller for controlling a power supply
213	First joint	8	Liquid level sensor
				214	Second joint

Detailed Description

Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the present utility model.

The jet loop reactor according to the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1 to 2, in an embodiment of the present utility model, there is provided an jet loop reactor for denitrification of landfill leachate, the jet loop reactor comprising:

the bioreactor 1 comprises a reactor body 11, wherein a water inlet 12, a water outlet 13 and a circulating water inlet 14 are formed in the reactor body 11, garbage percolate flows into the reactor body 11 through the water inlet 12 for denitrification treatment and is discharged from the water outlet 13, and the denitrification treatment comprises a circulating aeration stage and an anaerobic degassing stage;

one end of the injection unit 2 is connected with an external air source, and the other end of the injection unit is inserted into the reactor body 11; and

a circulation unit 3, one end of which is communicated with the circulation water inlet 14 and the other end of which is communicated with the injection unit 2;

in the cyclic aeration stage, the spraying unit 2 is opened for ventilation, and the liquid in the reactor body 11 enters the spraying unit 2 after being circulated by the circulating unit 3 and is sprayed after being mixed with air;

in the anaerobic degassing stage, the jet unit 2 stops aeration, and the liquid in the reactor body 11 is circulated by the circulation unit 3 and then is ejected from the jet unit 2.

Specifically, the cyclic aeration phase: the garbage percolate enters the reactor body 11 from the water inlet 12, the spraying unit 2 starts ventilation, the garbage percolate enters the spraying unit 2 through the circulating unit 3, is pressurized and sprayed out at a high speed, is mixed with air at the top of the reactor body 11, flows downwards to the bottom along the reactor body 11 and is converted into upwards flow, part of liquid is sucked into the spraying unit 2 again through the circulating water inlet 14 and sprayed out, and the other part of liquid is sucked into the reactor body 11 again, so that aerobic denitrification treatment is realized through multiple times of circulation.

Anaerobic degassing stage: the spraying unit 2 stops ventilation, the concentration of dissolved oxygen in the liquid in the outer cylinder 112 gradually decreases in the circulation process through the circulation unit 3, anaerobic denitrification treatment is performed after the anaerobic condition is reached, foam generated by aeration in the previous stage is eliminated, and the treated landfill leachate is discharged from the water outlet 13.

The two stages are different reaction stages of landfill leachate treatment, the spraying unit 2 and the circulating unit 3 are used for assisting in the reaction and switching between different reaction stages, all stages of the whole reaction process are carried out in the bioreactor 1, but are not carried out simultaneously, the spraying unit 2 and the circulating unit 3 are all parts connected to the reactor body 11, the problem that the number of reactors and the number of connecting pipelines are large due to the fact that different reactions are required to be carried out in different reactors is solved, a reaction device is simplified, and the difficulty of automatic control and implementation of the device is reduced.

In the embodiment of the utility model, the reactor body 11 comprises a guide cylinder 111 and an outer cylinder 112 which are nested and communicated in sequence from inside to outside, the water inlet 12, the water outlet 13 and the circulating water inlet 14 are all arranged on the outer cylinder 112, and the spraying unit 2 is inserted into the guide cylinder 111.

Specifically, the reactor body 11 is used as a carrier for implementing all reaction processes, and comprises a guide cylinder 111 and an outer cylinder 112, wherein the outer cylinder 112 is fixedly connected with the guide cylinder 111, and the top and the bottom of the guide cylinder 111 are communicated with the outer cylinder 112. The outer cylinder 112 is provided with a plurality of holes for connecting corresponding components, thereby completing the whole device. The top of the outer tub 112 is open, the water inlet 12 is provided at the top of the outer tub 112 and communicates with the outer tub 112, and the ejection unit 2 is inserted into the guide tube 111 from the top of the outer tub 112. The water outlet 13 is arranged at 1/4 to 1/5 of the height of the outer cylinder 112 from top to bottom according to the processing requirements, and for the case that the same volume of air is sprayed by the spraying unit 2: when the water outlet 13 is arranged at 1/5 position, the amount of the landfill leachate treated once is smaller, the treatment degree of the landfill leachate is higher after each circulation, and the number of times of circulation is smaller; when the treatment device is arranged at 1/4 position, the amount of the landfill leachate treated once is large, the treatment degree of the landfill leachate is low after each circulation, and the number of times of circulation is large. The circulation water inlet 14 is arranged in the middle of the height of the outer cylinder 112, so that the influence of the circulation unit 3 on the operation of the injection unit 2, namely the influence on the injection circulation reaction, is reduced.

Wherein, the inside of the guide cylinder 111 is a reaction zone, an outer reaction zone is arranged between the outside of the guide cylinder 111 and the outer cylinder 112, and landfill leachate flows downwards along the inner reaction zone after being sprayed out from the spraying unit 2 in the cyclic gas explosion process, and flows upwards through the outer reaction zone after reaching the bottom of the guide cylinder 111. Part of liquid in the outer reaction zone is sucked into the spraying unit 2 through the circulating unit 3 and sprayed out, and the other part reaches the top end of the guide cylinder 111 of the outer reaction zone and is sucked into the inner reaction zone by high-speed water flow of the spraying unit 2, and the aerobic denitrification treatment is realized through multiple circulation.

Further, the diameter ratio of the guide cylinder 111 to the outer cylinder 112 is designed to be 0.3-0.4, and too small a diameter ratio can reduce the inner reaction zone, so that the volume of liquid entering the inner reaction zone becomes small, and the treatment efficiency becomes slow; an excessively large diameter ratio may reduce the outer reaction zone, and the velocity of the reacted liquid flowing upward through the outer reaction zone after reaching the bottom becomes high, possibly resulting in that the liquid in the inner reaction zone is not yet completely reacted and is sucked again out of the inner reaction zone, reducing the treatment efficiency. The reasonable diameter ratio of the guide cylinder 111 to the outer cylinder 112 has a certain effect on the improvement of the treatment efficiency.

And, the bottom of the outer cylinder 112 is provided with an emptying port 16, the emptying port 16 is provided with an emptying valve, when the sludge in the outer cylinder 112 is excessive, the emptying valve is opened, and the sludge is discharged from the emptying port 16 to the outer cylinder 112.

Further, the ratio of the height to the diameter of the outer cylinder 112 is designed to be 4:1, a large aspect ratio is advantageous for reducing the footprint, but increases the jet loop resistance, 4: the height-diameter ratio of 1 is a moderate proportion, so that a certain occupied area can be reduced, and the jet circulation resistance cannot be excessively large, so that the treatment process cannot be finished.

In the embodiment of the utility model, the outer cylinder 112 is provided with an overflow port 15, and the horizontal plane of the overflow port 15 is higher than that of the water outlet 13. The height of the overflow port 15 is used for controlling the volume of the single landfill leachate poured into the outer barrel 112, namely stopping when the liquid level of the landfill leachate entering the outer barrel 112 reaches the height of the overflow port 15 each time, so as to prevent the liquid in the outer barrel 112 from flowing out and causing pollution.

In the embodiment of the utility model, the circulating unit 3 comprises a circulating pipe 31 and a circulating pump 32, the circulating pump 32 is arranged on the circulating pipe 31, the liquid inlet end of the circulating pipe 31 is communicated with the circulating water inlet 14, the liquid outlet end of the circulating pipe is communicated with the spraying unit 2, the circulating water inlet 14 is positioned in the middle of the outer cylinder 112, and the horizontal plane of the circulating water inlet 14 is lower than the horizontal plane of the water outlet 13.

Specifically, in the cyclic aeration phase: the circulation pump 32 is opened, the circulation pump 32 sucks the liquid in the outer cylinder 112 into the circulation pipe 31 from the circulation water inlet 14, flows into the injection unit 2 from the joint, and is injected into the guide cylinder 111 together with the air sucked by the other joint of the injection unit 2, so as to realize the nitration reaction process of converting high-volume load ammonia nitrogen into nitrate nitrogen and nitrite nitrogen, and then flows into the outer cylinder 112, and the nitrogen content in the outer cylinder 112 reaches a preset design value after repeated injection circulation, thus completing the aerobic denitrification treatment.

Anaerobic degassing stage: after the aerobic denitrification treatment is finished, the circulating pump 32 continues to work, liquid in the outer cylinder 112 is sucked into the circulating pipe 31 from the circulating water inlet 14, flows into the spraying unit 2 from the joint and is sprayed into the guide cylinder 111, at the moment, the spraying unit 2 stops ventilation, the spraying unit 2 plays a role in stirring the liquid in the outer cylinder 112, the elimination of foam generated in the previous stage is realized, the anaerobic environment is gradually reached, the denitrification process of converting nitrate nitrogen and nitrite nitrogen into nitrogen is realized, and the nitrate nitrogen and nitrite nitrogen contents of the liquid in the outer cylinder 112 reach preset design values through repeated jet circulation, so that the anaerobic denitrification treatment is completed.

In summary, the circulation pump 32 and the circulation pipe 31 of the present application play a key role in concentrating all the reactions into the bioreactor 1, and are also key components for performing jet circulation, and the circulation pump 32 and the circulation pipe 31 are provided to connect the bioreactor 1 and the jet unit 2 to simplify the process system, so that the reaction apparatus has a smaller floor space.

Further, the circulation water inlet 14 of the related art is generally provided at the upper portion of the outer tub 112 near the water inlet 12, at which time the jet circulation effect is affected due to the defect that the operation of the circulation pump 32 disturbs the suction effect and the secondary dispersion effect at the two-phase nozzle 21 and increases the resistance of the liquid jet to the bottom of the outer tub 112. In the embodiment of the utility model, the circulating water inlet 14 is arranged in the middle of the outer cylinder 112, so that the height of the sucked liquid can be shortened, the suction effect and the secondary dispersion effect can be enhanced, and the jet circulation resistance of the liquid can be reduced.

In the embodiment of the present utility model, the spraying unit 2 includes a two-phase nozzle 21, an air pipe 22 and an air pump 23, the air inlet end of the air pipe 22 is connected with the air pump 23, the two-phase nozzle 21 is inserted into the guide cylinder 111, two connectors are provided on the two-phase nozzle 21, one connector is communicated with the air outlet end of the air pipe 22, and the other connector is communicated with the circulation pipe 31.

Among them, the functions of the two-phase nozzle 21 mainly include a suction function and a secondary dispersion function to achieve the jet circulation. Suction effect: since the flow rate of the liquid ejected from the two-phase nozzle 21 is increased, the pressure at the top of the guide cylinder 111 is small, and the liquid in the outer cylinder 112 is sucked into the guide cylinder 111; secondary dispersion: the primary dispersion is that air is sprayed from the two-phase nozzle 21 to be mixed with the liquid, the liquid is sucked into the guide cylinder 111 by the suction effect, and at this time, large bubbles formed by the air mixed with the liquid through the primary dispersion through the jet circulation effect are in the liquid, and the large bubbles are sheared and dispersed into fine bubbles again by the air sprayed from the two-phase nozzle 21.

Further, the air supply amount of the air pump 23 is calculated in accordance with the design of 2-3mg/L of the dissolved oxygen concentration of the liquid and 0.4-0.5 of the oxygen transfer efficiency to provide sufficient oxygen to ensure the smooth progress of the aerobic denitrification treatment.

In the embodiment of the present utility model, the two-phase nozzle 21 includes an access section 211 and an ejection section 212, the access section 211 is cylindrical, the ejection section 212 is in a circular truncated cone shape, and an included angle between an extension line of the access section 211 and a bus of the ejection section 212 is set to be 16 ° to 18 °, the flow rate of the liquid is increased by reducing the cross-sectional area, the gas is sheared into ultrafine bubbles, the contact area between the gas and the liquid is increased, the liquid and the gas can fully react, and the pumping action and the secondary dispersion action are realized.

And, the joint is provided on the joining section 211, including a first joint 213 and a second joint 214, and the air tube 22 is inserted into the joining section 211 from the first joint 213 and protrudes into the guide cylinder 111 from the ejecting section 212; the second connector 214 is used for communicating the liquid outlet end of the circulation pipe 31, and liquid flows into the access section 211 from the liquid outlet end and is sprayed out from the spraying section 212, and the connectors are detachably connected with the pipeline, so that the disassembly and assembly of the reaction device are facilitated.

Further, the circulation ratio in the jet loop reactor, i.e. the ratio of the circulation flow rate of the circulation pump 32 per hour to the effective volume of the reactor body 11, is designed to be 2-4 times. The proper circulation ratio can ensure that the liquid in the reactor body 11 completely reacts and then enters the circulation pipe 31 for circulation, and can ensure that the liquid is continuously sprayed from the spraying section 212.

In the embodiment of the present utility model, the outer cylinder 112 is provided with a connection bracket 4, and the connection bracket 4 is detachably connected with the two-phase nozzle 21.

Specifically, the height of the two-phase nozzle 21 inserted into the guide cylinder 111 is adjusted by the connecting bracket 4 according to the content of organic matters in the landfill leachate. When the content of organic matters in the landfill leachate is high, the organic matters increase the resistance to jet circulation, and the two-phase nozzle 21 needs to be inserted into a proper position in the guide cylinder 111, so that air can reach the bottom of the guide cylinder 111 to fully react with liquid, and the suction effect is not affected.

In an embodiment of the present utility model, the jet loop reactor further comprises a water inlet unit 5 and a water outlet unit 6, the water inlet unit 5 being in communication with the water inlet 12 and the water outlet unit 6 being in communication with the water outlet 13.

Specifically, the water inlet unit 5 comprises a water inlet pipe 51 and a water inlet pump 52, the liquid outlet end of the water inlet pipe 51 is communicated with the water inlet 12, and the liquid inlet end is connected with the water inlet pump 52; the drain unit 6 includes a drain pipe 61 and a drain valve 62 provided on the drain pipe 61, a liquid inlet end of the drain pipe 61 communicates with the drain port 13, and opening and closing of the water inlet pump 52 and opening and closing of the drain valve 62 are controlled according to a liquid level of the liquid in the outer tub 112, thereby ensuring normal operation of the reaction apparatus.

In an embodiment of the present utility model, the jet loop reactor further comprises a controller 7 and a liquid level sensor 8 electrically connected to the controller 7, the liquid level sensor 8 being provided on the outer cylinder 112 and being adapted to detect the liquid level of the liquid in the outer cylinder 112 and to send out a liquid level signal at the same time, the controller 7 receiving the liquid level signal and controlling the operation of the circulation pump 32, the air pump 23, the water inlet pump 52 and the water discharge valve 62.

Specifically, all reactions are carried out in the bioreactor 1, and to ensure that a predetermined effect is achieved, the controller 7 is arranged to perform a sequencing batch automatic control in dependence on the signal of the level sensor 8. For the convenience of further understanding of the technical solution of the present application, the overall landfill leachate treatment process, action and control parameters are described in detail as follows:

and (3) water inlet stage: when the liquid level sensor 8 senses that the liquid level is low, namely, the liquid level reaches the position of the water outlet 13, a signal is fed back to the controller 7, and the controller 7 sends a control signal to turn on the water inlet pump 52; when the liquid level sensor 8 senses that the high liquid level, namely the liquid level, reaches the position of the overflow port 15, a signal is fed back to the controller 7, and the controller 7 sends a control signal to close the water inlet pump 52.

And (3) a cyclic aeration stage: when the liquid level sensor 8 senses a high liquid level, a signal is fed back to the controller 7, the controller 7 sends a control signal to open the circulating pump 32, after 30 seconds of delay, the air pump 23 is started by sending the control signal, and after the preset circulating aeration duration is reached, the air pump 23 is closed by sending the control signal. In this stage, the nitrifying bacteria and nitrosating bacteria convert ammonia nitrogen with high volume load in water into nitrate nitrogen and nitrite nitrogen under the condition of dissolved oxygen concentration (2-4) mg/L, and simultaneously organic matters in water are partially degraded. When the device is set by the controller 7, the time consumption can be calculated by the process design of the liquid water quality (chemical oxygen demand and ammonia nitrogen value), the aerobic nitrification volume load and the treatment capacity.

Anaerobic degassing stage: after the air pump 23 is turned off, the circulation pump 32 continues to operate, and after a predetermined anaerobic degassing period is reached, a control signal is sent to turn off the circulation pump 32. In this stage, the denitrifying bacteria convert nitrate nitrogen and nitrite nitrogen into nitrogen by using organic matters and discharge the nitrogen into the air, and at the same time, foam generated by aeration in the previous stage is eliminated. The time of the anaerobic degassing stage is set by the controller 7, and the time can be calculated by the process design of the liquid water quality (total nitrogen value), the anaerobic denitrification volume load and the treatment capacity.

Standing and precipitating: after the circulation pump 32 is turned off, the controller 7 sends a control signal to turn on the drain valve 62 after a predetermined settling time period has been reached. At this stage, the sludge naturally settles to the bottom of the outer cylinder 112 under the force of gravity. And process parameters are controlled by the controller 7 such as: when in use, the method can be calculated by the process design of the sludge property and the height-diameter ratio of the reaction device.

And (3) a drainage stage: when the liquid level sensor 8 senses a low liquid level, a signal is fed back to the controller 7, and the controller 7 sends a control signal to close the drain valve 62 and enter a water inlet stage.

In order to more intuitively show the improvement effect of the utility model on the prior art, the jet loop reaction device provided by the utility model is compared with the denitrification process in the prior art by 100m ³ The comparative data for the/d treatment scale design are as follows:

from the data, the jet circulation device in the utility model has obvious improvement in oxygen transfer efficiency and nitrification rate; the hydraulic retention time, the occupied area and the energy consumption are effectively reduced.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. An jet loop reactor for denitrification of landfill leachate, comprising:

the bioreactor (1) comprises a reactor body (11), wherein a water inlet (12), a water outlet (13) and a circulating water inlet (14) are formed in the reactor body (11), landfill leachate flows into the reactor body (11) through the water inlet (12) to be subjected to denitrification treatment and is discharged from the water outlet (13), and the denitrification treatment comprises a circulating aeration stage and an anaerobic degassing stage;

one end of the injection unit (2) is connected with an external air source, and the other end of the injection unit is inserted into the reactor body (11); and

a circulation unit (3), one end of which is communicated with the circulation water inlet (14) and the other end of which is communicated with the injection unit (2);

in the cyclic aeration stage, the spraying unit (2) is opened for ventilation, and the liquid in the reactor body (11) enters the spraying unit (2) after being circulated by the circulating unit (3) and is sprayed after being mixed with air;

in the anaerobic degassing stage, the spraying unit (2) stops ventilation, and the liquid in the reactor body (11) is sprayed out of the spraying unit (2) after being circulated by the circulating unit (3).

2. Jet loop reactor according to claim 1, characterized in that said reactor body (11) comprises a guide cylinder (111) and an outer cylinder (112) nested and communicating in sequence from inside to outside, said water inlet (12), said water outlet (13) and said circulating water inlet (14) being all open on said outer cylinder (112), said jet unit (2) being inserted into said guide cylinder (111).

3. Jet loop reactor according to claim 2, characterized in that said outer cylinder (112) is provided with an overflow opening (15), said overflow opening (15) being at a level higher than the level of said water outlet (13).

4. A jet loop reactor according to claim 3, characterized in that the circulation unit (3) comprises a circulation pipe (31) and a circulation pump (32), the circulation pump (32) is arranged on the circulation pipe (31), the liquid inlet end of the circulation pipe (31) is communicated with the circulation water inlet (14), the liquid outlet end is communicated with the jet unit (2), the circulation water inlet (14) is positioned in the middle of the outer cylinder (112) and the water level of the circulation water inlet (14) is lower than the water level of the water outlet (13).

5. Jet loop reactor according to claim 4, characterized in that said jet unit (2) comprises a two-phase nozzle (21), an air tube (22) and an air pump (23), the air inlet end of said air tube (22) being connected to said air pump (23), said two-phase nozzle (21) being inserted into said guide cylinder (111), said two-phase nozzle (21) being provided with two joints, one of said joints being in communication with the air outlet end of said air tube (22) and the other of said joints being in communication with said circulation tube (31).

6. Jet loop reactor according to claim 5, characterized in that said two-phase nozzle (21) comprises an access section (211) and an ejection section (212), said access section (211) being cylindrical, said ejection section (212) being frustoconical, the extension of said access section (211) being at an angle of 16 ° to 18 ° to the generatrix of said ejection section (212).

7. Jet loop reactor according to claim 6, characterized in that a connection bracket (4) is provided on said outer cylinder (112), said connection bracket (4) being detachably connected to said two-phase nozzle (21).

8. Jet loop reaction device according to claim 5, characterized in that it further comprises a water inlet unit (5) and a water outlet unit (6), said water inlet unit (5) being in communication with said water inlet (12) and said water outlet unit (6) being in communication with said water outlet (13).

9. Jet loop reaction device according to claim 8, characterized in that said water inlet unit (5) comprises a water inlet pipe (51) and a water inlet pump (52), a liquid outlet end of said water inlet pipe (51) being in communication with said water inlet (12), a liquid inlet end being connected with said water inlet pump (52); the drainage unit (6) comprises a drainage pipe (61) and a drainage valve (62) arranged on the drainage pipe (61), and a liquid inlet end of the drainage pipe (61) is communicated with the drainage outlet (13).

10. Jet loop reactor according to claim 9, characterized in that the jet loop reactor further comprises a controller (7) and a level sensor (8) electrically connected to the controller (7), the level sensor (8) being provided on the reactor body (11) and being adapted to detect the level of liquid in the reactor body (11) while emitting a level signal, the controller (7) receiving the level signal and controlling the operation of the circulation pump (32), the air pump (23), the water inlet pump (52) and the water discharge valve (62).