CN112850895A - Method and device for treating pymetrozine organic nitrogen wastewater - Google Patents

Abstract

The invention discloses a method and a device for treating pymetrozine organic nitrogen wastewater, which comprise an aerobic ammoniation system, a secondary sedimentation tank, a denitrification system, a tertiary sedimentation tank and a special nitrification system, wherein the pymetrozine organic nitrogen wastewater is acclimatized and subjected to aerobic ammoniation reaction based on aerobic sludge, and after the reaction is finished, the aerobic sludge and the wastewater are separated in the secondary sedimentation tank for 2-4 hours; adding corresponding inoculated sludge, PAM solution and carbon source into the wastewater based on corresponding denitrification conditions for denitrification treatment, staying the reacted mixed solution by using three sedimentation tanks, and recovering the inoculated sludge; under the set nitrification condition, the liquid in the three sedimentation tanks is subjected to special nitrification reaction by utilizing a tubular ceramic membrane or a plate-type ceramic membrane with inoculated bacteria, and after the reaction is finished, the nitrification liquid is recovered and the waste liquid is discharged, so that the organic nitrogen treatment meets the latest discharge standard.

Description

Method and device for treating pymetrozine organic nitrogen wastewater

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a method and a device for treating pymetrozine organic nitrogen wastewater.

Background

Pymetrozine belongs to pyridine (pyridazone imines) or triazone insecticides, is a brand-new non-biocidal insecticide, was originally developed by Ciba-Geigy, Switzerland in 1988, and shows excellent control effect on piercing-sucking mouthpart pests of various crops. A strand of high organic nitrogen wastewater is generated in the production process of pymetrozine, the organic nitrogen content of the strand of wastewater is 500-1500mg/L, which exceeds the treatment acceptance of the traditional biochemical system, and the pymetrozine belongs to the high organic nitrogen wastewater which is difficult to treat.

At present, the main method for removing organic nitrogen at home and abroad comprises the following steps: the physicochemical pretreatment and the biochemical method are used for treating the organic nitrogen, the treatment cost is high, and the treatment effect cannot be ensured along with the difference of water quality. Therefore, organic nitrogen treatment of such water is a technical difficulty which needs to be solved urgently in the industry. Under the condition that the wastewater contains organic nitrogen, the organic nitrogen needs to be converted into ammonia nitrogen through an ammoniation reaction to carry out subsequent nitrification and denitrification. For the traditional A2O denitrification treatment process, the denitrification effect is influenced because the pesticide wastewater contains more toxic substances which can generate certain inhibiting effect on biological denitrification reaction, and the denitrification effect is influenced because the carbon source available in the denitrification process is insufficient due to low biochemical property of the pesticide wastewater. In addition, as the COD concentration of the pesticide wastewater is high, the organic load of an aerobic system is high, nitrifying bacteria are inhibited, and the nitrification reaction effect is influenced, so that the ammonia nitrogen and the total nitrogen effluent in the effluent are difficult to reach the standard. It is difficult for the conventional organic nitrogen treatment process to satisfy the latest emission standards.

Disclosure of Invention

The invention aims to provide a method and a device for treating pymetrozine organic nitrogen wastewater, so that organic nitrogen treatment meets the latest emission standard.

In order to achieve the above object, in a first aspect, the present invention provides a method for treating pymetrozine organic nitrogen wastewater, comprising the following steps:

acclimatization and aerobic ammoniation reaction are carried out on pymetrozine organic nitrogen wastewater based on aerobic sludge, and after the reaction is finished, the reaction is carried out for 2-4h in a secondary sedimentation tank, so that the separation of the aerobic sludge and the wastewater is finished;

adding corresponding inoculated sludge, PAM solution and carbon source into the wastewater based on corresponding denitrification conditions for denitrification treatment, staying the reacted mixed solution by using three sedimentation tanks, and recovering the inoculated sludge;

under the set nitrification condition, the liquid in the three sedimentation tanks is subjected to special nitrification reaction by utilizing a tubular ceramic membrane or a plate-type ceramic membrane with inoculated bacteria, and after the reaction is finished, the recovery of nitrified liquid and the discharge of waste liquid are carried out.

The method comprises the following steps of performing acclimatization and aerobic ammoniation reaction on pymetrozine organic nitrogen wastewater based on aerobic sludge, and performing 2-4h in two sedimentation tanks after the reaction is finished to complete separation of the aerobic sludge and the wastewater, wherein the method comprises the following steps:

adjusting the concentration of the aerobic sludge to be more than or equal to 10000mg/L, the pH value to be 6.5-7.0 and the dissolved oxygen to be more than or equal to 3.0mg/L to obtain a corresponding ammoniation reaction environment;

acquiring pymetrozine organic nitrogen wastewater based on the ammoniation reaction environment, and domesticating the concentration of the pymetrozine organic nitrogen wastewater according to a set lifting rate;

and carrying out aerobic ammoniation reaction on the pymetrozine organic nitrogen wastewater based on aerobic sludge, and after the reaction is finished, carrying out 2-4h in a secondary sedimentation tank to finish the separation of the aerobic sludge and the wastewater.

The method comprises the following steps of performing aerobic ammoniation reaction on pymetrozine organic nitrogen wastewater based on aerobic sludge, performing 2-4h in two sedimentation tanks after the reaction is finished, and completing separation of the aerobic sludge and the wastewater, wherein the method comprises the following steps:

carrying out aerobic ammoniation reaction on the pymetrozine organic nitrogen wastewater for more than or equal to 3 days by using the aerobic sludge;

after the reaction is finished, the mixture obtained by the reaction enters a secondary sedimentation tank to stay for 2 to 4 hours;

and extracting and recovering the aerobic sludge in the two sedimentation tanks.

Under the set nitrification condition, the liquid in the three sedimentation tanks is subjected to special nitrification reaction by utilizing a tubular ceramic membrane or a plate-type ceramic membrane with inoculated thalli, and after the reaction is finished, the recovery of nitrified liquid and the discharge of waste liquid are carried out, and the method comprises the following steps:

based on the set nitrification conditions, carrying out solid-liquid separation on the liquid in the three sedimentation tanks by using a tubular ceramic membrane or a plate-type ceramic membrane with inoculated bacteria, and adding nitrate into the liquid to carry out pH adjustment;

and discharging or recycling liquid obtained by solid-liquid separation, and collecting the obtained sludge.

Wherein, discharge or retrieve the liquid that obtains solid-liquid separation, collect the mud that obtains, include:

discharging a first part of liquid obtained by solid-liquid separation as wastewater;

and recovering the second part of liquid obtained by solid-liquid separation according to the reflux rate which is 2-4 times of the water inflow velocity of the tubular ceramic membrane or the plate ceramic.

Wherein the set nitrification condition is that the sludge concentration is 80000-100000mg/L, the dissolved oxygen is more than or equal to 4mg/L, and the pH is 7.5-8.5.

In a second aspect, the invention provides a device for treating pymetrozine organic nitrogen wastewater, which is suitable for the method for treating pymetrozine organic nitrogen wastewater in the first aspect,

the device for treating the pymetrozine organic nitrogen wastewater comprises an aerobic ammoniation system, two sedimentation tanks, a denitrification system, three sedimentation tanks and a special nitrification system, wherein the aerobic ammoniation system, the two sedimentation tanks, the denitrification system, the three sedimentation tanks and the special nitrification system are sequentially communicated, the two sedimentation tanks are communicated with the aerobic ammoniation system through double pipelines, the three sedimentation tanks are communicated with the denitrification system through double pipelines, and the special nitrification system is also communicated with the denitrification system.

The method and the device for treating pymetrozine organic nitrogen wastewater comprise an aerobic ammoniation system, a secondary sedimentation tank, a denitrification system, a tertiary sedimentation tank and a special nitrification system, wherein the pymetrozine organic nitrogen wastewater is acclimatized and subjected to aerobic ammoniation reaction based on aerobic sludge, and after the reaction is finished, the aerobic sludge and the wastewater are separated in the secondary sedimentation tank for 2-4 hours; adding corresponding inoculated sludge, PAM solution and carbon source into the wastewater based on corresponding denitrification conditions for denitrification treatment, staying the reacted mixed solution by using three sedimentation tanks, and recovering the inoculated sludge; under the set nitrification condition, the liquid in the three sedimentation tanks is subjected to special nitrification reaction by utilizing a tubular ceramic membrane or a plate-type ceramic membrane with inoculated bacteria, and after the reaction is finished, the nitrification liquid is recovered and the waste liquid is discharged, so that the organic nitrogen treatment meets the latest discharge standard.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic step diagram of a method for treating pymetrozine organic nitrogen wastewater provided by the invention.

FIG. 2 is a schematic flow chart of the treatment of pymetrozine organic nitrogen wastewater provided by the invention.

FIG. 3 is a schematic structural diagram of a pymetrozine organic nitrogen wastewater treatment device provided by the invention.

Fig. 4 is a schematic structural diagram of an aerobic ammoniation system provided by the present invention.

Fig. 5 is a schematic structural view of fig. 4 without a tank body provided by the invention.

1-aerobic ammoniation system, 2-secondary sedimentation tank, 3-denitrification system, 4-tertiary sedimentation tank, 5-special nitrification system, 11-tank body, 12-air inlet mechanism, 13-damping mechanism, 14-fixing mechanism, 15-aerator, 141-fixing plate, 142-supporting component, 143-adjusting component, 1421-clamping seat, 1422-supporting rod, 1423-fixing bolt, 1424-fixing block, 1425-movable block, 1431-ribbon, 1432-latch, 1433-locking buckle, 131-hydraulic rod, 132-damping spring and 121-air inlet pipe.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 and fig. 2, the present invention provides a method for treating pymetrozine organic nitrogen wastewater, comprising the following steps:

s101, domestication and aerobic ammoniation reaction are carried out on pymetrozine organic nitrogen wastewater based on aerobic sludge, and after the reaction is finished, the reaction is carried out for 2-4h in a secondary sedimentation tank 2, so that the separation of the aerobic sludge and the wastewater is completed.

Specifically, the concentration of the aerobic sludge is adjusted to be more than or equal to 10000mg/L, the pH value is adjusted to be 6.5-7.0, and the dissolved oxygen is adjusted to be more than or equal to 3.0mg/L, so as to obtain a corresponding ammoniation reaction environment; acquiring pymetrozine organic nitrogen wastewater based on the ammoniation reaction environment, and domesticating the concentration of the pymetrozine organic nitrogen wastewater according to a set lifting rate; and carrying out aerobic ammoniation reaction on the pymetrozine organic nitrogen wastewater based on aerobic sludge, and after the reaction is finished, carrying out 2-4h in a secondary sedimentation tank 2 to finish the separation of the aerobic sludge and the wastewater.

Pymetrozine organic nitrogen wastewater directly enters an aerobic ammoniation system 1 for treatment, sludge inoculated by the system is conventional aerobic sludge, the wastewater concentration is required to be gradually increased for acclimation when the system enters in the early stage, the retention time of the wastewater is required to be controlled to be more than or equal to 3d when the system is finally stable, the sludge concentration in the treatment system is more than or equal to 10000mg/L, the pH in the treatment system is more than or equal to 6.5 and less than or equal to 7.0, the control range is a key index, the toxicity of the system after a large amount of ammonium radicals are generated is reduced, dissolved oxygen in the system needs to be more than or equal to 3.0mg/L, the backflow flow rate of sludge in the secondary sedimentation tank is 1-4 times of the inflow flow rate, a muddy water mixture enters the secondary sedimentation tank for sedimentation, the residence time of the secondary sedimentation tank is controlled to be 2-4h, more than 99.5% of organic nitrogen in pymetrozine organic nitrogen wastewater treated by the whole system is converted into ammonia nitrogen, and the system can remove COD (chemical oxygen demand) substances in the wastewater.

S102, adding corresponding inoculated sludge, PAM solution and carbon source into the wastewater for denitrification treatment based on corresponding denitrification conditions, and utilizing a three-sedimentation tank 4 to stay the reacted mixed solution and recover the inoculated sludge.

Specifically, under the denitrification conditions that the sludge concentration is more than or equal to 20000mg/L, the PAM adding amount is 3-10mg/L, the dissolved oxygen is controlled at 0.5mg/L, and the pH value is more than or equal to 6.5 and less than or equal to 7.5, the corresponding inoculated sludge is utilized to carry out denitrification treatment on the wastewater, and a PAM solution and a carbon source are added simultaneously; after the reaction is finished, the three sedimentation tanks 4 are used for staying and sedimentation for 3-6h, nitrifying liquid is refluxed according to 2-4 times of the water inlet rate, and the inoculated sludge is recovered according to 1-2 times of the water inlet rate.

The wastewater enters an anoxic special denitrification system 3 for treatment, the nitrate and nitrite content in the nitrified liquid is reduced after the nitrified liquid is mixed in the system, and then denitrification treatment is carried out to generate nitrogen. The inoculated sludge of the system is denitrifying sludge or pure denitrifying bacteria, the denitrification reaction is only carried out in the system, other biochemical reactions are not carried out, the sludge precipitation performance is improved by adding PAM in the reaction, the sludge concentration is improved, the sludge concentration in the system is controlled to be more than or equal to 20000mg/L, the adding amount of PAM is 3-10mg/L, the dissolved oxygen is controlled to be 0.5mg/L, the pH in the treatment system is not less than 6.5 and not more than 7.5, the sludge is precipitated in a three-precipitation tank 4 and then flows back, the backflow speed is 1-2 times of the inflow speed, the retention time of a mud-water mixture in the three-precipitation tank 4 is 3-6h, the backflow speed of nitrifying liquid is 2-4 times of the inflow speed, an additional carbon source is simultaneously added in the system, the additional carbon source can be substances such as glucose, methanol, ethanol, molasses and the like, the adding amount is 1-5 times of the nitrate concentration, after the treatment by the system, the removal rate of nitrate and nitrite in the system is more than 99%.

S103, carrying out special nitration reaction on the liquid in the three sedimentation tanks 4 by using a tubular ceramic membrane or a plate-type ceramic membrane with inoculated bacteria under the set nitration condition, and recovering the nitration liquid and discharging waste liquid after the reaction is finished.

Specifically, the set nitrification condition is that the sludge concentration is 80000-100000mg/L, the dissolved oxygen is more than or equal to 4mg/L, and the pH value is 7.5-8.5; based on the set nitrification conditions, carrying out solid-liquid separation on the liquid in the three sedimentation tanks 4 by using a tubular ceramic membrane or a plate-type ceramic membrane with inoculated bacteria, and adding nitrate into the liquid to carry out pH adjustment; discharging a first part of liquid obtained by solid-liquid separation as wastewater; and recovering the second part of liquid obtained by solid-liquid separation according to the reflux rate which is 2-4 times of the water inflow velocity of the tubular ceramic membrane or the plate ceramic.

The liquid in the three sedimentation tanks 4 enters a ceramic membrane MBR special nitration system 5, the system adopts a tubular ceramic membrane or a plate ceramic membrane, the aperture of the ceramic membrane needs to be less than or equal to 1 micron, a mud-water mixture circularly enters the ceramic membrane through a pump, the clear liquid overflows to cause the ceramic membrane, sludge is intercepted, so that solid-liquid separation is realized, the inoculated thallus of the system is pure nitrobacteria and nitrosobacteria, the system controls the sludge concentration to be 80000 and 100000mg/L, controls the dissolved oxygen to be more than or equal to 4mg/L, controls the pH value in the treatment system to be more than or equal to 7.5 and less than or equal to 8.5, continuously feeds the pH value in the system through carbonate for on-line control, the used carbonate is sodium carbonate or potassium carbonate, one part of effluent is discharged, the majority of effluent is used as nitration liquid backflow, the nitration liquid backflow speed is 2-4 times of the inflow flow speed, the system can realize the high-speed nitration reaction of ammonia nitrogen below 2000mg/L, the ammonia nitrogen removal rate in the discharged water after the wastewater is treated by the step is more than 99 percent, and the organic nitrogen content and the ammonia nitrogen content in the discharged water are both less than 8 mg/L.

Referring to fig. 2 to 5, the present invention provides a device for treating pymetrozine organic nitrogen wastewater, which is suitable for the method for treating pymetrozine organic nitrogen wastewater,

the device for treating the pymetrozine organic nitrogen wastewater comprises an aerobic ammoniation system 1, a secondary sedimentation tank 2, a denitrification system 3, a tertiary sedimentation tank 4 and a special nitrification system 5, wherein the aerobic ammoniation system 1, the secondary sedimentation tank 2, the denitrification system 3, the tertiary sedimentation tank 4 and the special nitrification system 5 are sequentially communicated, the secondary sedimentation tank 2 is communicated with the aerobic ammoniation system 1 through double pipelines, the tertiary sedimentation tank 4 is communicated with the denitrification system 3 through double pipelines, and the special nitrification system 5 is also communicated with the denitrification system 3.

In the embodiment, firstly, pymetrozine organic nitrogen wastewater directly enters the aerobic ammoniation system 1 for treatment, the system is inoculated with sludge which is conventional aerobic sludge, the concentration of the wastewater is gradually increased for acclimatization when the sludge enters in the early stage, the retention time of the wastewater is controlled to be more than or equal to 3d when the system is finally stable, the concentration of the sludge in the treatment system is more than or equal to 10000mg/L, the pH value in the treatment system is more than or equal to 6.5 and less than or equal to 7.0, the control range is a key index, the toxicity of the system after a large amount of ammonium radicals are generated is reduced, dissolved oxygen in the system needs to be more than or equal to 3.0mg/L, the backflow flow rate of sludge in the secondary sedimentation tank is 1-4 times of the inflow flow rate, a muddy water mixture enters the secondary sedimentation tank for sedimentation, the residence time of the secondary sedimentation tank is controlled to be 2-4h, more than 99.5% of organic nitrogen in pymetrozine organic nitrogen wastewater treated by the whole system is converted into ammonia nitrogen, and the system can remove COD (chemical oxygen demand) substances in the wastewater.

Then, the wastewater enters an anoxic special denitrification system 3 for treatment, the nitrate and nitrite content in the nitrified liquid is reduced after the nitrified liquid is mixed in the system, and then denitrification treatment is carried out to generate nitrogen. The inoculated sludge of the system is denitrifying sludge or pure denitrifying bacteria, the denitrification reaction is only carried out in the system, other biochemical reactions are not carried out, the sludge precipitation performance is improved by adding PAM in the reaction, the sludge concentration is improved, the sludge concentration in the system is controlled to be more than or equal to 20000mg/L, the adding amount of PAM is 3-10mg/L, the dissolved oxygen is controlled to be 0.5mg/L, the pH in the treatment system is not less than 6.5 and not more than 7.5, the sludge is precipitated in a three-precipitation tank 4 and then flows back, the backflow speed is 1-2 times of the inflow speed, the retention time of a mud-water mixture in the three-precipitation tank 4 is 3-6h, the backflow speed of nitrifying liquid is 2-4 times of the inflow speed, an additional carbon source is simultaneously added in the system, the additional carbon source can be substances such as glucose, methanol, ethanol, molasses and the like, the adding amount is 1-5 times of the nitrate concentration, after the treatment by the system, the removal rate of nitrate and nitrite in the system is more than 99%.

Finally, the liquid in the three sedimentation tanks 4 enters a ceramic membrane MBR special nitration system 5, the system adopts a tubular ceramic membrane or a plate ceramic membrane, the aperture of the ceramic membrane needs to be less than or equal to 1 micron, a mud-water mixture circularly enters the ceramic membrane through a pump, clear liquid overflows to cause the ceramic membrane, sludge is intercepted, so solid-liquid separation is realized, inoculated thalli of the system are pure nitrobacteria and nitrosobacteria, the system controls the sludge concentration to be 80000 mg/L and 100000mg/L, dissolved oxygen to be more than or equal to 4mg/L, the pH in the treatment system is more than or equal to 7.5 and less than or equal to 8.5, the pH in the system is continuously added by carbonate for on-line control, the used carbonate is sodium carbonate or potassium carbonate, a part of effluent is discharged, most of the effluent is used as nitration liquid backflow, the nitration liquid backflow speed is 2-4 times of the inflow flow speed, and the whole, the system can realize the high-speed nitration reaction of ammonia nitrogen below 2000mg/L, the ammonia nitrogen removal rate in the discharged water after the wastewater is treated by the step is more than 99 percent, and the organic nitrogen content and the ammonia nitrogen content in the discharged water are both less than 8mg/L, thereby meeting the latest discharge standard.

Further, the aerobic ammoniation system 1 comprises a tank body 11, an air inlet mechanism 12, a plurality of shock absorption mechanisms 13, a fixing mechanism 14 and an aerator 15, wherein the air inlet mechanism 12 is fixedly connected with the tank body 11 and is positioned in the tank body 11, the plurality of shock absorption mechanisms 13 are fixedly connected with the tank body 11 and are positioned on one side of the air inlet mechanism 12, the fixing mechanism 14 is fixedly connected with the plurality of shock absorption mechanisms 13 and is positioned on one side far away from the tank body 11, and the aerator 15 is detachably connected with the fixing mechanism 14 and is positioned in the fixing mechanism 14;

the fixing mechanism 14 includes a fixing plate 141, a plurality of supporting components 142 and a plurality of adjusting components 143, the fixing plate 141 is fixedly connected to the drum and located at a side away from the tank 11, the plurality of supporting components 142 is fixedly connected to the fixing plate 141 and located at a side away from the damping mechanism 13, the plurality of adjusting components 143 are detachably connected to the plurality of supporting components 142 and located at a side away from the fixing plate 141, the plurality of supporting components 142 include a plurality of clamping seats 1421, a plurality of supporting rods 1422 and a plurality of fixing bolts 1423, the plurality of clamping seats 1421 are fixedly connected to the fixing plate 141 and located at a side away from the tank 11, the plurality of supporting rods 1422 are detachably connected to the plurality of clamping seats 1421 and located at a side away from the damping mechanism 13, the plurality of fixing bolts 1423 are detachably connected to the plurality of supporting rods 1422 and the plurality of clamping seats 1421, and is located in the clamping seat 1421 and the supporting rod 1422, the clamping seats 1421 each include a fixed block 1424 and a movable block 1425, the fixed block 1424 is fixedly connected with the fixed plate 141 and is located at one side of the supporting rod 1422, and the movable block 1425 is slidably connected with the fixed plate 141 and is located at one side far from the fixed block 1424.

In this embodiment, because in the aerobic ammoniation system 1, there will be these three kinds of situations of intaking, play water and sediment recovery, in order to guarantee the stability of the in-process dissolved oxygen volume of reacting, need carry out the dissolved oxygen device in the aerobic ammoniation system 1 to need fix and stabilize, with the stability of guaranteeing the dissolved oxygen volume, and then guarantee that organic nitrogen handles and satisfies up-to-date emission standard.

Firstly, the fixing mechanism 14 is stabilized by the damping mechanism 13, the fixing bolt 1423 is rotated, that is, the movable block 1425 slides on the fixing plate 141, so that a gap occurs between the support rod 1422 and the clamping seat 1421, then the included angle of the support rod 1422 relative to the fixing plate 141 is adjusted, so as to change the distance between the support rods 1422, so that the support assembly 142 can be adjusted according to the size of the aerator 15, thereby increasing the application range of the aerobic ammoniation system 1, then the aerator 15 is fixed on the support rod 1422 by the adjusting assembly 143, and the air intake mechanism 12 is communicated with the aerator 15, so as to start the air intake mechanism 12, thereby increasing the dissolved oxygen amount in the aerobic ammoniation system 1. Meanwhile, the stability of the aerator 15 is improved by means of the damping mechanism 13, the occurrence of large shaking is avoided, and meanwhile, the supporting component 142 is utilized for fixing and size adjustment, so that the dissolved oxygen content of the system is improved, and the subsequent organic nitrogen treatment effect is ensured.

Further, each of the adjusting assemblies 143 includes a strap 1431 and a plurality of latches 1432, the plurality of latches 1432 are respectively fixedly connected to the plurality of support bars 1422 and located at a side far from the clamping seat 1421, and the strap 1431 is detachably connected to the plurality of latches 1432 and located in the latches 1432.

In this embodiment, after the angle of the supporting rod 1422 is adjusted, the ribbon 1431 slides between the plurality of latches 1432 to adapt to the size between the supporting rods 1422, wherein the ribbon 1431 is made of a flexible material and is made of a material that does not react with chemical components in the tank 11, and the flexible ribbon 1431 is used to fix the position of the aerator 15, so as to avoid damage to the aerator 15, and meanwhile, the ribbon can also adapt to the aerators 15 with different shapes, thereby increasing the application range.

Further, the plurality of adjusting assemblies 143 further includes a locking button 1433, and the locking button 1433 is detachably connected to the strap 1431, and is fixedly connected to the supporting rod 1422, and is located at one side of the locking button 1432.

In this embodiment, in order to increase the fixing effect of the ribbon 1431 on the aerator 15, the ribbon 1431 after the position is fixed is bundled and locked by the locking buckle 1433, so as to further ensure the stability of the position of the aerator 15, and to facilitate the stability of the dissolved oxygen amount.

Further, a plurality of the damping assemblies each include a hydraulic rod 131 and a damping spring 132, the damping spring 132 is fixedly connected to the fixing plate 141 and the tank body 11 and is located between the fixing plate 141 and the tank body 11, and the hydraulic rod 131 is fixedly connected to the fixing plate 141 and the tank body 11 and is located in the damping spring 132.

In the present embodiment, since a certain sloshing occurs in the tank body 11 when the drainage, the intake, or the aerobic sludge is recovered, the fixing mechanism 14 is damped by the damping spring 132 and the hydraulic rod 131 in the form of a damping damper or the like in order to reduce the influence on the aerator 15.

Further, the air intake mechanism 12 includes two air intake pipes 121, and both of the two air intake pipes 121 are communicated with the aerator 15 and are respectively located at two sides of the aerator 15.

In the present embodiment, at present, one air inlet pipe 121 is usually connected to the middle of the aerator 15, but it is not easy to ensure the stability of the oxygen output amount of the aerator 15, and after one air inlet pipe 121 is broken, the normal operation of the device may be affected, so the air inlet pipes 121 are respectively connected to both ends of the aerator 15, which is convenient to ensure the stability and constancy of the air pressure in each hole of the aerator 15, and at the same time, when no air is supplied to any one air inlet pipe 121, the other air inlet pipe 121 may also operate, and the two air inlet pipes 121 are located at both ends of the aerator 15, which may not affect the aerator 15.

The method and the device for treating pymetrozine organic nitrogen wastewater comprise an aerobic ammoniation system 1, a secondary sedimentation tank 2, a denitrification system 3, a tertiary sedimentation tank 4 and a special nitrification system 5, wherein the pymetrozine organic nitrogen wastewater is acclimatized and aerobically ammoniated based on aerobic sludge, and after the reaction is finished, the separation of the aerobic sludge and the wastewater is finished by performing 2-4 hours in the secondary sedimentation tank 2; adding corresponding inoculated sludge, PAM solution and carbon source into the wastewater based on corresponding denitrification conditions for denitrification treatment, staying the reacted mixed solution by using a three-sedimentation tank 4, and recovering the inoculated sludge; under the set nitrification condition, the liquid in the three sedimentation tanks 4 is subjected to special nitrification reaction by utilizing a tubular ceramic membrane or a plate-type ceramic membrane with inoculated bacteria, and after the reaction is finished, the recovery of nitrified liquid and the discharge of waste liquid are carried out, so that the organic nitrogen treatment meets the latest discharge standard.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. A method for treating pymetrozine organic nitrogen wastewater is characterized by comprising the following steps:

acclimatization and aerobic ammoniation reaction are carried out on pymetrozine organic nitrogen wastewater based on aerobic sludge, and after the reaction is finished, the reaction is carried out for 2-4h in a secondary sedimentation tank, so that the separation of the aerobic sludge and the wastewater is finished;

adding corresponding inoculated sludge, PAM solution and carbon source into the wastewater based on corresponding denitrification conditions for denitrification treatment, staying the reacted mixed solution by using three sedimentation tanks, and recovering the inoculated sludge;

under the set nitrification condition, the liquid in the three sedimentation tanks is subjected to special nitrification reaction by utilizing a tubular ceramic membrane or a plate-type ceramic membrane with inoculated bacteria, and after the reaction is finished, the recovery of nitrified liquid and the discharge of waste liquid are carried out.

2. The method for treating pymetrozine organic nitrogen wastewater as claimed in claim 1, wherein the acclimatization and aerobic ammoniation reaction of pymetrozine organic nitrogen wastewater is carried out based on aerobic sludge, and after the reaction is finished, the separation of aerobic sludge and wastewater is completed in a secondary sedimentation tank for 2h-4h, comprising the following steps:

adjusting the concentration of the aerobic sludge to be more than or equal to 10000mg/L, the pH value to be 6.5-7.0 and the dissolved oxygen to be more than or equal to 3.0mg/L to obtain a corresponding ammoniation reaction environment;

acquiring pymetrozine organic nitrogen wastewater based on the ammoniation reaction environment, and domesticating the concentration of the pymetrozine organic nitrogen wastewater according to a set lifting rate;

and carrying out aerobic ammoniation reaction on the pymetrozine organic nitrogen wastewater based on aerobic sludge, and after the reaction is finished, carrying out 2-4h in a secondary sedimentation tank to finish the separation of the aerobic sludge and the wastewater.

3. The method for treating pymetrozine organic nitrogen wastewater as claimed in claim 2, wherein the aerobic ammoniation reaction is carried out on the pymetrozine organic nitrogen wastewater based on aerobic sludge, and after the reaction is finished, the separation of the aerobic sludge and the wastewater is finished in two sedimentation tanks for 2h-4h, comprising the following steps:

carrying out aerobic ammoniation reaction on the pymetrozine organic nitrogen wastewater for more than or equal to 3 days by using the aerobic sludge;

after the reaction is finished, the mixture obtained by the reaction enters a secondary sedimentation tank to stay for 2 to 4 hours;

and extracting and recovering the aerobic sludge in the two sedimentation tanks.

4. The method for treating pymetrozine organic nitrogen wastewater as claimed in claim 1, wherein under the set nitrification conditions, the liquid in the three sedimentation tanks is subjected to a specific nitrification reaction by using a tubular ceramic membrane or a plate-type ceramic membrane with inoculated bacteria, and after the reaction is finished, the recovery of the nitrified liquid and the discharge of waste liquid are carried out, comprising the following steps:

based on the set nitrification conditions, carrying out solid-liquid separation on the liquid in the three sedimentation tanks by using a tubular ceramic membrane or a plate-type ceramic membrane with inoculated bacteria, and adding nitrate into the liquid to carry out pH adjustment;

and discharging or recycling liquid obtained by solid-liquid separation, and collecting the obtained sludge.

5. The method for treating pymetrozine organic nitrogen wastewater as claimed in claim 4, wherein the steps of discharging or recovering the liquid obtained by solid-liquid separation and collecting the obtained sludge comprise:

discharging a first part of liquid obtained by solid-liquid separation as wastewater;

and recovering the second part of liquid obtained by solid-liquid separation according to the reflux rate which is 2-4 times of the water inflow velocity of the tubular ceramic membrane or the plate ceramic.

6. The method for treating pymetrozine organic nitrogen waste water as claimed in claim 1,

the set nitrification condition is that the sludge concentration is 80000-100000mg/L, the dissolved oxygen is more than or equal to 4mg/L, and the pH is 7.5-8.5.

7. A treatment device of pymetrozine organic nitrogen waste water, which is suitable for the treatment method of pymetrozine organic nitrogen waste water as claimed in any one of claims 1 to 6,

the device for treating the pymetrozine organic nitrogen wastewater comprises an aerobic ammoniation system, two sedimentation tanks, a denitrification system, three sedimentation tanks and a special nitrification system, wherein the aerobic ammoniation system, the two sedimentation tanks, the denitrification system, the three sedimentation tanks and the special nitrification system are sequentially communicated, the two sedimentation tanks are communicated with the aerobic ammoniation system through double pipelines, the three sedimentation tanks are communicated with the denitrification system through double pipelines, and the special nitrification system is also communicated with the denitrification system.

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