CN112079437A

CN112079437A - Intermittent air stirring sewage hydrolysis acidification method and reactor

Info

Publication number: CN112079437A
Application number: CN202010998679.3A
Authority: CN
Inventors: 李建
Original assignee: Suzhou Dadao Environmental Protection Technology Co ltd
Current assignee: Suzhou Dadao Environmental Protection Technology Co ltd
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2020-12-15

Abstract

The invention provides an intermittent air stirring sewage hydrolysis acidification method, which comprises the following steps: injecting sewage and anaerobic sludge into the tank body; simultaneously opening valves of a sewage water injection port and a water outlet of the tank body, and starting a sludge-water separator; starting the air stirrer; stopping the operation of the air stirrer, and separating the sludge adsorbed with the pollutants from the water; and starting a valve of the sludge discharge port to discharge the residual sludge at the bottom of the tank body. Through intermittent type stirring, make mud and sewage take place intermittent type nature contact, mud and sewage intensive mixing when the contact, macromolecule in the sewage, colloidal state and the easy mud of particulate matter are adsorbed, and the micromolecule material of solubility is difficult by the mud adsorption, the micromolecule material of class micromolecule material and the volatile acid class micromolecule material of anaerobic hydrolysis production in the intake remain in the sewage like this, when realizing anaerobic hydrolysis acidification to macromolecular material from this, keep micromolecule material, thereby improve the biodegradability of sewage, do not reduce the total amount of the carbon source that can supply the nitrogen and phosphorus removal to utilize.

Description

Intermittent air stirring sewage hydrolysis acidification method and reactor

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a sewage hydrolysis acidification method and a sewage hydrolysis acidification reactor by intermittent air stirring.

Background

Hydrolytic acidification is a traditional wastewater treatment technology, and aiming at a specific project, the key to the successful application of hydrolytic acidification is the reasonable application of the hydrolytic acidification principle combined with the actual situation. Based on actual conditions, the hydrolysis acidification reaction principle is reasonably applied, and the hydrolysis acidification reactor is selected, designed and used according to local conditions, so that the hydrolysis acidification can be efficiently and economically utilized. The biochemical oxygen demand and chemical oxygen demand ratio (BOD: COD, abbreviated as B: C) of sewage is generally used to represent the degree of difficulty of the sewage in being degraded by the microbiological method, and is called the biodegradability of the sewage. Generally, the B: C in the sewage is less than or equal to 0.3, the sewage is difficult to biodegrade, namely the sewage is treated by a biological method, and some substances in the sewage are difficult to biodegrade. For the wastewater with low concentration and containing refractory organic pollutants, the hydrolytic acidification pretreatment is adopted, so that the biodegradability of the wastewater can be improved (the B: C value is improved), the biotoxicity of the wastewater is reduced, the subsequent aerobic biochemical treatment is facilitated, the final standard of effluent is ensured, and the generation of sludge is reduced. Municipal comprehensive sewage treatment plants are large in amount, low in pollutant concentration and high in effluent discharge standard requirements, and in recent years, some environmentally sensitive areas require CODcr discharge concentration of not higher than 30mg/L for factory water and need nitrogen and phosphorus removal. If industrial wastewater is discharged into a municipal sewage plant, organic pollutants which are difficult to be biochemically degraded may exist, and the municipal sewage plant is required to be provided with hydrolysis acidification to convert the organic matters which are difficult to be degraded into degradable organic matters, or to adopt advanced oxidation such as iron-carbon micro-electrolysis, FENTON, ozone and the like or even adopt an activated carbon adsorption means to ensure the removal of the organic matters which are difficult to be degraded.

The anaerobic hydrolysis acidification has better economical efficiency in both investment and running cost. The municipal sewage is treated by anaerobic hydrolysis acidification, and the key points are that the biodegradable organic matters can be effectively decomposed to improve the biodegradability of the sewage, and the total amount of carbon sources for nitrogen and phosphorus removal is not reduced, so that the two aspects are often contradictory, and the problem that municipal sewage plants cannot popularize hydrolysis acidification technology is solved.

The reason is that the traditional hydrolytic acidification adopts a continuous mechanical stirring or hydraulic stirring reaction mode, anaerobic microorganisms in the sludge (microorganisms which have hydrolytic acidification effect on organic pollutants in the sewage are mixed with other particles in the sewage and agglomerated, and the anaerobic microorganisms are called anaerobic biochemical sludge in engineering and are called sludge for short) continuously react with organic matters in the sewage, so that the hydrolytic acidification effect is performed on organic matters with difficult macromolecule degradation, and small molecular organic matters in the water and generated by macromolecule degradation are further converted into methane, so that the carbon source loss is caused to be unfavorable for subsequent denitrification and dephosphorization.

Therefore, a device which can effectively decompose refractory organic matters to improve the biodegradability of sewage and does not reduce the total amount of carbon sources available for nitrogen and phosphorus removal is lacked.

Disclosure of Invention

The invention provides an intermittent air stirring sewage hydrolysis acidification method and a reactor, which are used for intermittently contacting sludge and sewage through intermittent stirring, wherein the sludge and the sewage are fully mixed during the contact, macromolecular, colloidal and granular substances in the sewage are easily adsorbed by the sludge, and soluble micromolecular substances are not easily adsorbed by the sludge, so that the micromolecular substances are kept in the sewage, basically do not generate anaerobic hydrolysis, and the substances adsorbed in the sludge generate hydrolysis acidification under the action of anaerobic hydrolysis microorganisms in the sludge to generate micromolecular substances (generally volatile fatty acid, volatile acid for short), and the micromolecular substances are separated from the constraint of the sludge and transferred into the sewage in the next stirring process, thereby reducing the anaerobic degradation, ensuring that the difficultly degraded organic matters are effectively decomposed and improving the biodegradability of the sewage, but also does not reduce the total amount of carbon sources available for denitrification and dephosphorization.

The invention provides an intermittent air stirring sewage hydrolysis acidification method, which comprises the following steps:

step one, injecting sewage and anaerobic sludge into a tank body;

opening valves of a sewage water injection port and a water outlet of the tank body at the same time, and setting hydraulic retention time of the water injection port and the water outlet;

step three, starting the sewage separator;

after the preset time, starting an air stirrer to enable sludge in the anaerobic tank to suspend, wherein the anaerobic sludge is contacted with sewage;

after the preset time, stopping the operation of the air stirrer, and separating the sludge adsorbed with the pollutants from the water;

and step six, after repeating the step one to the step five for multiple times, starting a valve of a sludge discharge port to discharge the residual sludge at the bottom of the tank body.

Preferably, in the second step, the displacement of the water filling port is consistent with that of the water outlet;

preferably, the step two further comprises that water inlet of the water injection port is interrupted or continuous; correspondingly, the water outlet of the water outlet is also intermittent or continuous.

Preferably, the pollutants are macromolecules, colloidal substances and particulate substances in the sewage.

Preferably, the hydraulic retention time is 3-36 hours.

The invention provides an intermittent air stirring sewage hydrolysis acidification reactor, which is suitable for an intermittent air stirring sewage hydrolysis acidification method and comprises the following steps: the sewage treatment device comprises a pool body, a water inlet, a water outlet and a sludge discharge port, wherein the water inlet is arranged above one side of the pool body, the water outlet and the sludge discharge port are arranged at intervals on one side far away from the water inlet, the water inlet is used for injecting sewage, the water outlet is used for discharging sewage after hydrolytic acidification, and the sludge discharge port is used for discharging residual sludge in the pool body; and a mud-water separator is arranged on one side of the pool body, which is close to the water outlet.

Preferably, a plurality of air stirrers are arranged in the tank body at intervals, the air inlet end of each air stirrer is connected with an air pipe sequentially through a pipeline, and one end of each air pipe, which is far away from the air stirrer, extends out of the tank body and extends to the outside of the tank body.

Preferably, a buffer groove is arranged on one side of the tank body close to the water outlet, the buffer groove extends outwards from one side of the tank body, the bottom end of one side of the buffer groove far away from the tank body is an inclined plane, and the side wall of the buffer groove is used for being connected with the water outlet; and the mud-water separator is arranged on one side of the buffer tank, which is far away from the water outlet, at intervals.

The invention aims to provide a technology for hydrolyzing and acidifying sewage by adopting intermittent air stirring. Intermittent type stirring, make mud and sewage take place intermittent type nature contact, mud and sewage intensive mixing when the contact, macromolecule in the sewage, colloidal state and the easy mud of particulate matter are adsorbed, and the difficult mud of dissolved micromolecule material is adsorbed, micromolecule material remains in the sewage like this, anaerobic hydrolysis basically does not take place, and the material adsorbed in mud, the hydrolytic acidification takes place and produces micromolecule material such as volatile acid under the effect of anaerobic hydrolysis microorganism in mud, these micromolecule material break away from the constraint of mud at the in-process of stirring next time and shift to sewage in, thereby avoid being further anaerobic degradation. The air stirring is adopted, and because the air contains oxygen, the anaerobic system is oxygenated during the air stirring, so that the growth of methane bacteria can be inhibited. The methanobacteria are microorganisms which further degrade and convert volatile acid into methane, are strict anaerobes, and influence the activity of the methanobacteria if oxygen exists. The hydrolytic acidification bacteria are facultative bacteria, namely microorganisms capable of surviving in an anaerobic environment and an aerobic environment, and the growth of the hydrolytic acidification bacteria cannot be inhibited by the oxygenation effect generated by air stirring. Adopt intermittent type nature air stirring like this, can make macromolecule, colloidal state and particulate matter by sludge adsorption and produce hydrolysis acidification in mud, make an intermittent type nature oxygenate environment simultaneously, can not exert an influence to hydrolysis acidification fungus, nevertheless can restrain methane-producing fungus's growth to avoid the volatile acid that hydrolysis acidification produced to be degraded and remain in sewage, by subsequent nitrogen and phosphorus removal utilization.

In order to achieve the above and other related objects, the present invention provides an intermittent air agitation hydrolysis acidification reactor, which comprises a tank body, a water inlet, a water outlet, and an air pipe, wherein an air agitator is installed at the bottom of the tank body, the air agitator is connected with the air pipe, a mud-water separator is arranged at the water outlet end of the tank body, and a mud discharge port is arranged at the lower part of the tank body.

The working process of the intermittent air stirring hydrolysis acidification reactor is as follows: (1) the tank body is filled with sewage and inoculated with a certain amount of anaerobic hydrolyzed and acidified sludge, the tank body can continuously or discontinuously feed water, the effluent and the influent are in step, the sewage and the sludge are separated by the action of a mud-water separator while the effluent is discharged, the sewage is discharged out of the tank body, and the sludge is remained in the tank body; (2) starting air stirring when the set time is reached, so that anaerobic sludge is suspended and fully contacted with sewage, macromolecules, colloidal substances and granular substances in the sewage are adsorbed by the sludge, and soluble micromolecular substances in the sewage are remained in the water; (3) stopping stirring, and settling the sludge adsorbed with the pollutants in the reactor; (4) hydrolyzing and acidifying the adsorbed pollutants by hydrolytic acidification microorganisms in the sludge to form micromolecular volatile acid; (5) continuously circulating the processes (1) to (4); (6) under the proliferation action of microorganisms, the sludge concentration in the tank body is continuously improved, and a certain proportion of sludge is periodically discharged through a sludge discharge port so as to keep the sludge concentration in the tank body in a reasonable range.

The blower for providing air can adopt various blower forms such as a centrifugal blower, a Roots blower and the like, and the blower is controlled by a PLC (programmable logic controller) to set the circulating opening and stopping time.

The time required from the sewage entering the tank body from the water inlet to the sewage discharging from the water outlet is called Hydraulic Retention Time (HRT).

The sludge in the hydrolysis reactor is continuously proliferated on the one hand, and on the other hand, a part of the sludge is taken out along with the effluent, and a reasonable mud-water separator is adopted, so that the amount of the proliferated sludge is greater than the amount of the taken-out sludge, the sludge concentration of the reactor is not reduced, the sludge concentration is continuously improved, part of aged sludge is periodically discharged along with the improvement of the sludge concentration, and the sludge activity is kept. The total amount of sludge in the reactor is then divided by the amount of sludge discharged per day (the sum of the removal with the effluent and the periodic discharge from the bottom) and is referred to as the sludge retention time (also called sludge age, SRT).

The intermittent air stirring hydrolysis acidification reactor has the general HRT range of 3-36 hours and the general SRT range of 5-50 days.

The intermittent air stirring hydrolysis acidification reactor can adopt perforated pipe air stirring and rotational flow air stirring, and the stirring air amount of 0.5-1.5 cubic meters per hour is generally adopted for each cubic meter of tank volume.

The intermittent air stirring hydrolysis acidification reactor is used for stirring once every 1-5 hours for 1-30 minutes.

An intermittent air stirring hydrolysis acidification reactor, a mud-water separator generally adopts an inclined plate inclined tube precipitation device described in the patent application '201910857823', the distance between inclined plates is generally 50-100 mm, and polyethylene or stainless steel is generally adopted.

The intermittent air stirring hydrolysis acidification reactor has sludge concentration of 2000-8000 mg/L.

After the sewage is subjected to hydrolytic acidification treatment by adopting the intermittent air stirring hydrolytic acidification reactor, the ratio of B to C of the sewage can be increased to more than 0.3 from less than 0.3, and the biodegradability of the sewage is improved, so that organic pollutants in the sewage are easily biodegraded in the subsequent biological treatment process.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the connection structure of the intermittent sludge discharge mechanism of the present invention;

FIG. 3 is a perspective view of the intermittent sludge discharge mechanism of the present invention;

FIG. 4 is a schematic structural view of a first slide block and a second slide groove of the present invention;

fig. 5 is a schematic view of a second gear and toothed plate connection structure of the present invention;

FIG. 6 is a schematic view of the housing structure of the present invention;

fig. 7 is a schematic structural view of the first stirring blade and the second stirring blade of the present invention.

Wherein, 1-an air stirrer, 2-a mud-water separator, 3-an air pipe, 4-a water inlet, 5-a tank body, 6-a water outlet, 7-a sludge discharge port and 8-a buffer tank;

9-a baffle, 10-a first movable groove, 11-an upright post, 12-a first gear, 13-a limiting plate, 14-a first rotating shaft, 15-a first sliding block, 16-a first sliding groove, 17-a mud outlet channel, 18-a vertical plate, 19-a second sliding groove, 20-a bracket and 21-a first through notch,

22-an adjusting plate, 23-a fixed plate, 24-a second rotating shaft, 25-a second gear, 26-a toothed plate, 27-a second sliding block, 28-a shifting block, 29-a fixed plate, 30-a guide groove, 31-a first cylinder, 32-a third rotating shaft, 33-a first limit ring, 34-a fourth rotating shaft, 35-a rotating disc, 36-a fifth rotating shaft, 37-a second limit ring, 38-a sixth rotating shaft, 39-a boss, 40-a second movable groove, 41-a shell, 42-a spring, 43-a second through notch, 44-a movable cavity, 45-a bearing, 46-a driving rod, 47-an intermittent mud discharging mechanism, 48-a motor, 49-a connecting rod, 50-a first stirring blade and 51-a second stirring blade.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Example 1

As shown in figure 1, the invention provides a method for hydrolyzing and acidifying sewage by intermittent air stirring, which comprises the following steps:

step one, injecting sewage and anaerobic sludge into a tank body;

step three, starting a mud-water separator;

after the preset time, starting an air stirrer to enable sludge in the anaerobic tank to be suspended, and enabling anaerobic suspended sludge formed by anaerobic and sludge suspension to be in contact with sewage;

preferably, the step two further comprises that water inlet of the water injection port is interrupted or continuous; correspondingly, the water outlet of the water outlet is not interrupted or continuous.

Preferably, the hydraulic retention time is 3-36 hours.

According to the figure 1, the invention provides a batch type air stirring sewage hydrolysis acidification reactor, which is suitable for a batch type air stirring sewage hydrolysis acidification method, and comprises the following steps: the sewage treatment device comprises a pool body, a water inlet, a water outlet and a sludge discharge port, wherein the water inlet is arranged above one side of the pool body, the water outlet and the sludge discharge port are arranged at intervals on one side far away from the water inlet, the water inlet is used for injecting sewage, the water outlet is used for discharging sewage after hydrolytic acidification, and the sludge discharge port is used for discharging sludge at the bottom in the pool body; and a mud-water separator is arranged on one side of the pool body, which is close to the water outlet.

An intermittent air stirring hydrolysis acidification reactor, a mud-water separator generally adopts an inclined plate inclined tube precipitation device described in the patent application '20191085782.3', the distance between inclined plates is generally 50-100 mm, and polyethylene or stainless steel is generally adopted.

Example 2

The sewage of a certain comprehensive sewage treatment plant contains a small amount of printing and dyeing wastewater, and the sewage amount is 500m³The intermittent air stirring hydrolysis acidification reactor shown in the figure 1 is adopted, the CODcr concentration of the inlet water of the reactor is about 600mg/L, and the BOD of the inlet water of the reactor₅The concentration is about 150mg/L, namely B: C is 0.25, and the aerobic biodegradability of the sewage is poor.

The hydraulic retention time of the hydrolysis acidification reactor is designed to be 5 hours, and the sludge retention time of the hydrolysis acidification reactor is designed to be 30 days. The air agitation was designed to be on every 2 hours for 5 minutes. The sludge concentration in the reactor is designed to be 4000mg/L, and the inclined plate spacing of the sludge-water separator is designed to be 50 mm.

Through an intermittent air stirring hydrolysis acidification reactor, the concentration of CODcr of the effluent water of the reactor is about 540mg/L and BOD₅The concentration is about 240mg/L, the BOD5 concentration is increased by 90mg/L, the B: C is increased from 0.25 to 0.44, the biodegradability is greatly improved, and the effluent of the hydrolysis acidification reactor is easy to be treated by a subsequent biological method.

Example 3

In one embodiment, as shown in fig. 1 to 7, an intermittent sludge discharge mechanism 47 is further included, a plurality of sludge discharge ports 7 are arranged at intervals on the tank body 5, an intermittent sludge discharge mechanism 47 is arranged on one side of the tank body 5 close to the sludge discharge ports 7, a motor 48 is erected above an opening of the tank body 5, the motor 48 drives the intermittent sludge discharge mechanism 47 through a driving rod 46, a bevel gear is arranged at one end of the driving rod 46 far from the motor 48, a bevel gear is also arranged at one end of the first rotating shaft 14 on the intermittent sludge discharge mechanism 47, and the bevel gear of the driving rod 46 and the bevel gear of the first rotating shaft 14 are arranged in a mutually meshed manner; the intermittent sludge discharge mechanism 47 includes: the vertical plate 18 is erected on the inner wall of the tank body 5, the vertical plate 18 is provided with a sludge outlet channel 17, and the sludge outlet channel 17 is used for discharging sludge at the bottom in the tank body 5 to the sludge discharge port 7; a first chute 16 is arranged on one side of the vertical plate 18 far away from the sludge discharge port 7, the baffle 9 is slidably arranged on the first chute 16, a support 20 is further arranged on the vertical plate 18, the support 20 is of a U-shaped structure, two ends of the U-shaped structure are oppositely provided with extension ends, and the extension ends are used for being fixed on one side of the first chute 16 of the vertical plate 18; a second sliding groove 19 is formed in the support 20, a first sliding block 15 is arranged in the second sliding groove 19, and limiting plates 13 are arranged on two sides of the first sliding block 15; the U-shaped structure of the bracket 20 forms a first through notch 21, the first rotating shaft 14 penetrates through the two limiting plates 13, and one end of the first rotating shaft 14 extends into the first through notch 21 of the bracket 20; a first movable groove 10 with an annular structure is formed in one surface, close to the support 20, of the baffle plate 9, the end of the first rotating shaft 14 reciprocates in the first movable groove 10, and a plurality of upright posts 11 are uniformly distributed on the baffle plate 9 at intervals; a first gear 12 is arranged on the first rotating shaft 14, and teeth of the first gear 12 are meshed with the upright posts 11;

the first rotating shaft 14 is rotatably arranged on the first sliding block 15 and the limiting plate 13 through a bearing 45.

When the baffle plate is in work, the motor is started, and then the bevel gear of the first rotating shaft is driven to rotate by the bevel gear of the driving rod, so that the first rotating shaft rotates through the bearing and drives the first gear to rotate, the first gear can be meshed with the upright post on the baffle plate after rotating, and the first rotating shaft is driven to move on the first movable groove of the baffle plate; therefore, the purpose that the baffle moves in the first sliding chute can be achieved, and the baffle can open or close the sludge discharge port on one side of the sludge discharge channel in the moving process of the first sliding chute, so that the purpose of intermittently discharging the sludge accumulated at the bottom in the tank body can be achieved; the situation that mud accumulated in the tank body is difficult to discharge due to the fact that the tank body is too large is reduced;

in another embodiment, the inner wall of the tank body is provided with a holding tank for holding the baffle; if the bottom in the tank body is an inclined plane, the mud accumulated at the bottom in the tank body can be selectively discharged through the intermittent mud discharging mechanism; specifically, the mud discharging port can be arranged in a plurality of inclined positions relative to each other according to the inclined angle, and the mud at the bottom in the pool body is discharged by sequentially starting different mud discharging ports.

According to the baffle is adjusted, the partial opening or the whole opening of the mud outlet channel is realized, and the purpose of adjusting the mud outlet flow is realized. When the mud discharging channel is completely opened, the baffle is completely positioned in the accommodating groove, so that the aims of completely removing the baffle and completely opening the mud discharging channel can be fulfilled.

Example 4

In one embodiment, further comprising an agitation drive, the agitation drive comprising: the device comprises a shell 41, a first cylinder 31 and a third rotating shaft 32, wherein a movable cavity 44 is arranged inside the shell 41, the movable cavity 44 is of a cylindrical structure, the first cylinder 31 is sleeved in the movable cavity 44, a second through notch 43 is arranged on one side of the movable cavity 44, and the third rotating shaft 32 is arranged at one end, close to the second through notch 43, of the first cylinder 31; bosses 39 are symmetrically arranged on the circumferential outer wall of the shell 41, second movable grooves 40 are arranged in the bosses 39, the second movable grooves 40 are communicated with the movable cavity 44, and a second sliding block 27 is arranged at one end, far away from the third rotating shaft 32, of the first cylinder 31; one surface of the second slider 27 close to the movable cavity 44 is of an arc-shaped structure, one surface far away from the arc-shaped structure is provided with a toothed plate 26, the toothed plate 26 is used for meshing a second gear 25, the second gear 25 is fixed on a fixed disk 23, two side surfaces of the fixed disk 23 are fixedly provided with second rotating shafts 24, and the second rotating shafts 24 are respectively and rotatably arranged in the second movable grooves 40; the circumference outer wall of fixed disk 23 is equipped with regulating plate 22, be equipped with the through hole that outwards runs through in activity chamber 44, the through hole is used for regulating plate 22 to stretch out activity chamber 44, the through hole is the bar hole, regulating plate 22 is in the downthehole reciprocating motion of bar, the one end that regulating plate 22 kept away from shell 41 is located the below of first pivot 14, the cover is equipped with spring 42 on the third pivot 32, the one end of spring 42 is connected first cylinder 31, the other end of spring 42 is connected one side inner wall that activity chamber 44 is close to second through notch 43; the circumferential outer wall of the first cylinder 31 is provided with a guide groove 30 with an arc structure, the inner wall of the movable cavity 44 is provided with a shifting block 28, the shifting block 28 and the guide groove 30 are arranged in a mutually matched manner, and one end, far away from the guide groove 30, of the shifting block 28 extends out of the outer wall of the shell 41 and is fixed on the outer wall of the shell 41 through a fixing sheet 29; a end of the third rotating shaft 32, which is far away from the housing 41, is sleeved in a first limiting ring 33, the first limiting ring 33 is erected in the tank body 5 through a connecting rod 49, one end of the third rotating shaft 32, which is far away from the housing 41, is connected with a fourth rotating shaft 34, one end of the fourth rotating shaft 34, which is far away from the third rotating shaft 32, is fixedly connected with the upper surface of a turntable 35, the center position of the lower surface of the turntable 35 is connected with a fifth rotating shaft 36, one end of the fifth rotating shaft 36, which is far away from the turntable 35, is connected with a sixth rotating shaft 38, the rotating sleeve of the fifth rotating shaft 36 is sleeved in a second limiting ring 37, the outer wall of the second limiting ring 37 is provided with the connecting rod 49, and the; the rotating disc 35 is arranged obliquely, the inclination angle of the rotating disc 35 is 10-35 degrees, the fourth rotating shaft 34 and the axial center line of the rotating disc 35 are arranged at intervals, a plurality of first stirring blades 50 are arranged at intervals on the circumferential outer wall of the rotating disc 35, and a plurality of second stirring blades 51 are arranged at intervals on the circumferential outer wall of one end, away from the fifth rotating shaft 36, of the sixth rotating shaft 38; a spring is arranged on the inner wall of one side of the movable cavity 44 far away from the second through notch 43, and one end of the spring far away from the movable cavity is connected with the second sliding block.

When the first gear and the upright column are meshed with each other, the first rotating shaft can move in the first movable groove, so that the first rotating shaft drives the first sliding block to reciprocate in the second sliding groove, the adjusting plate of the driving mechanism can be driven to move in the process of moving up and down, and the moving direction of the adjusting plate reciprocates along the axial center line of the shell;

when the adjusting plate is pulled towards the direction of the first cylinder, namely the first rotating shaft reaches the lower end of the second sliding chute, the second gear is meshed with the toothed plate, and the second sliding block is driven to move towards the inner bottom of the movable cavity; the first cylinder and the third rotating shaft are carried together to move in the moving cavity. At the moment, the third rotating shaft is driven by the first cylinder to rotate and move towards the direction of the movable cavity;

when the first rotating shaft is located above the second sliding groove, the adjusting plate loses the pressure of the first rotating shaft, the spring can pull the first cylinder to the direction of the second through notch of the movable cavity, so that the spring of the movable cavity pushes against the second sliding block to move to the direction of the second through notch, and at the moment, the toothed plate drives the second gear to rotate, so that the adjusting plate is reset; the first cylinder is pushed to move towards the direction of the second through notch in the movable cavity in the moving process of the second sliding block, so that the guide groove on the circumferential outer wall of the first cylinder is matched with the shifting block again, and the purpose of rotating the first cylinder is achieved; then the third rotating shaft is rotated again, and the third rotating shaft is extended out of the first through notch.

The second sliding block and the first cylinder are arranged adjacently, and when the second sliding block drives the first cylinder to move in the movable cavity, the spring pushes the first cylinder to move towards the bottom of the groove of the movable cavity; the inner wall of the movable cavity is provided with the shifting block, and the outer wall of the first cylinder is provided with the guide groove with an arc structure; the first cylinder can rotate through the guide groove and the shifting block when moving in the movable cavity, the first cylinder can be driven to rotate after rotating, the third rotating shaft can be driven to do up-and-down and axial reciprocating motion together after rotating, the fourth rotating shaft can be driven to do up-and-down and axial reciprocating motion together, the rotating disc can be driven to rotate in the up-and-down and axial reciprocating motion process, the sludge at the bottom in the pool body can be disturbed by the first stirring blades arranged on the circumferential outer wall of the rotating disc, and therefore the sludge can better flow to the sludge outlet channel, and the sludge discharge work in the first stage is completed.

In the reciprocating process that the third rotating shaft extends out of and extends into the movable cavity, and the third rotating shaft can also perform reciprocating autorotation when extending out of and extending into the movable cavity, so that the third rotating shaft drives the fourth rotating shaft to move.

Furthermore, a fifth rotating shaft is driven to rotate in the rotating process of the rotating disc, a sixth rotating shaft is driven to rotate after the fifth rotating shaft rotates, and the sixth rotating shaft drives the second stirring blades to rotate, so that the sludge at the bottom in the tank body is disturbed by the second stirring blades, the sludge discharge work of the second stage is further realized, the sludge in the tank body is disturbed by the first stirring blades and the second stirring blades respectively, and the sludge discharge efficiency in the tank body is accelerated; meanwhile, the intermittent sludge discharge mechanism in the previous embodiment is combined to realize the purpose of opening partial sludge discharge ports or opening all sludge discharge ports of sludge in the tank body; the purpose of selecting the discharge capacity of the sludge discharge port to start according to the storage of sludge in the tank body is realized. Not only can save energy, but also improve the sludge discharge efficiency.

In the embodiment, the first stirring blade on the rotary disc can disturb sludge at one end of the tank body far away from the sludge outlet channel, and the sludge can flow to the sludge outlet channel or the sludge discharge port along with the action of water flow; the obliquely arranged rotating disc can enable the first stirring blade to be stronger in power surrounding than the rotating disc arranged in a plane; the second stirring blade can improve the purpose of discharging the sludge at the bottom in the tank body.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A sewage hydrolysis acidification method by intermittent air stirring is characterized by comprising the following steps:

step one, injecting sewage and anaerobic sludge into a tank body;

step three, starting a mud-water separator;

after the preset time, starting an air stirrer to enable the sewage to be in suspension contact with the sludge;

2. The intermittent air stirring sewage hydrolysis and acidification method as claimed in claim 1, wherein in the second step, the water injection ports and the water outlets have the same discharge capacity.

3. The intermittent air stirring sewage hydrolysis and acidification method as claimed in claim 1, further comprising the step two of intermittently or continuously feeding water into the water injection port;

correspondingly, the water outlet of the water outlet is also intermittent or continuous.

4. The method of claim 1, wherein the contaminants are macromolecules, colloidal materials, and particulate materials in the wastewater.

5. The method for hydrolytic acidification of sewage by intermittent air stirring as claimed in claim 1, wherein the hydraulic retention time is 3-36 hours.

6. A batch type air stirring sewage hydrolytic acidification reactor which is suitable for the batch type air stirring sewage hydrolytic acidification method of any one of claims 1 to 5, and is characterized by comprising the following steps: a tank body, a water inlet, a water outlet and a sludge discharge port,

a water inlet is arranged above one side of the tank body, a water outlet and a sludge discharge port are arranged at intervals on one side far away from the water inlet,

the water inlet is used for injecting sewage, the water outlet is used for discharging sewage after hydrolytic acidification, and the sludge discharge port is used for discharging sludge at the bottom in the tank body;

and a mud-water separator is arranged on one side of the pool body, which is close to the water outlet.

7. The batch air agitation sewage hydrolysis acidification reactor of claim 6,

the interval is equipped with a plurality of air agitator in the cell body, air agitator's inlet end loops through the pipe connection air hose, the air hose is kept away from air agitator's one end stretches out the cell body and extends to the outside of cell body.

8. The batch-type air-stirring sewage hydrolytic acidification reactor as claimed in claim 6, wherein a buffer tank is disposed on a side of the tank body close to the water outlet, the buffer tank extends outward from a side of the tank body, a bottom end of a side of the buffer tank away from the tank body is provided with an inclined surface, and a side wall of the buffer tank is used for connecting the water outlet;

and the mud-water separator is arranged on one side of the buffer tank, which is far away from the water outlet, at intervals.