CN212924725U - Biological nitrogen and phosphorus removal integrated sewage treatment device - Google Patents
Biological nitrogen and phosphorus removal integrated sewage treatment device Download PDFInfo
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- CN212924725U CN212924725U CN202020912335.1U CN202020912335U CN212924725U CN 212924725 U CN212924725 U CN 212924725U CN 202020912335 U CN202020912335 U CN 202020912335U CN 212924725 U CN212924725 U CN 212924725U
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Abstract
The utility model discloses a biological nitrogen and phosphorus removal integration sewage treatment plant, include: the closed anoxic tank, the aeration tank, the sedimentation tank and the coagulation filtering tank are sequentially arranged along the flowing direction of the sewage and are sequentially communicated through overflow, and a water inlet pipe of the sewage is respectively communicated with the closed anoxic tank and the aeration tank; a plurality of air stripping devices are distributed in the aeration tank and the sedimentation tank so as to realize sewage backflow among the sedimentation tank, the aeration tank and the closed anoxic tank; the dosing system is used for adjusting a carbon source of the sewage in the closed anoxic tank and the aeration tank and flocculating and precipitating the sewage in the coagulation filtering tank; the controller adjusts the rotating speed of the blower through the frequency converter according to the monitoring data of the oxidation-reduction potential probe and the dissolved oxygen probe. The device can achieve good biological nitrogen and phosphorus removal effect, realizes synchronous nitrification and denitrification, has continuous operation, occupies less land and saves investment.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, more specifically relates to a biological nitrogen and phosphorus removal integration sewage treatment plant.
Background
The denitrification method for wastewater can be divided into a physical and chemical method and a biological denitrification method, wherein the biological denitrification method comprises a traditional process denitrification method based on three reactions of ammoniation, nitrification and denitrification, and comprises an A/O (anoxic/aerobic) denitrification process, an oxidation ditch nitrification denitrification method, an SBR (sequencing batch reactor) method and the like. Biological denitrification has various forms and has great potential due to the characteristics of economy, no secondary pollution and the like. The traditional sewage biological denitrification technology has the advantages of longer process flow, larger occupied area, low denitrification efficiency and high sludge production, and along with the increasing severity of the water eutrophication problem and the continuous improvement of the discharge standard of nitrogen pollutants, the research and development of a novel efficient and energy-saving sewage biological denitrification method becomes an urgent task.
The method disclosed by the prior art cannot fully utilize the carbon source in the raw water in the emission requirement of biological denitrification treatment, so that more carbon sources need to be supplemented, and the emission standard of total nitrogen is continuously improved along with the development of economy and the increasing emphasis on environmental protection, and the existing biological denitrification technology cannot meet the requirement of the existing emission standard. Two problems with the bio-doubling technique exist: firstly, the core of the technology is still an activated sludge method, and the sludge-water separation mode still adopts the traditional gravity separation, so that the technology is difficult to achieve stable standard under the condition that the current standard SS (suspended solids) requirement is increasingly strict; secondly, the main objective of this technique is to realize getting rid of ammonia nitrogen and total nitrogen, and it does not have very effectual promotion to the efficiency of getting rid of total phosphorus, and is difficult to realize stably up to standard.
Therefore, the research and development of the integrated sewage treatment device for biological nitrogen and phosphorus removal are expected to solve the problems in the existing sewage biological nitrogen and phosphorus removal technology so as to meet the high-standard sewage discharge requirement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a biological nitrogen and phosphorus removal integration sewage treatment plant can reach good biological nitrogen and phosphorus removal effect to realize synchronous nitrification and denitrification, the operation lasts, and occupation of land is few, saves the investment.
In order to achieve the above object, the utility model provides a biological nitrogen and phosphorus removal integration sewage treatment plant, include:
the sewage treatment device comprises a closed anoxic tank, an aeration tank, a sedimentation tank and a coagulation filtering tank which are sequentially arranged along the flowing direction of sewage and are sequentially communicated through overflow, wherein the closed anoxic tank and the aeration tank are respectively communicated with a sewage inlet pipe;
the gas stripping system comprises an air blower and a plurality of gas stripping devices respectively connected with the air blower, and the plurality of gas stripping devices are distributed in the aeration tank and the sedimentation tank so as to realize sewage backflow among the sedimentation tank, the aeration tank and the closed anoxic tank;
the dosing system is used for dosing the closed anoxic tank and the aeration tank so as to adjust a carbon source of the sewage in the closed anoxic tank and the aeration tank and flocculate and precipitate the sewage in the coagulation and filtration tank;
the control system comprises a controller and a frequency converter, and the controller is connected to the air blower through the frequency converter.
Optionally, denitrifying bacteria are contained in the closed anoxic tank, and a stirring paddle is arranged in the closed anoxic tank and connected to a driving motor;
wherein, the stirring rake is the hyperboloid stirring rake, and the material is glass steel, driving motor is low-speed variable frequency motor.
Optionally, the plurality of stripping devices comprises an inner reflux stripping device, a large circulation stripping device and an outer reflux stripping device;
the internal reflux gas stripping device is arranged at the bottom of the aeration tank and is positioned at one end of the aeration tank close to the closed anoxic tank, so that the sewage at the bottom of the aeration tank floats upwards and flows back to the closed anoxic tank;
the large circulation gas stripping device is arranged at the bottom of the aeration tank and is positioned at one end of the aeration tank close to the sedimentation tank, so that sewage at the bottom of the rear end of the aeration tank floats upwards and flows back to the front end of the aeration tank;
the external reflux gas stripping device is arranged at the bottom of the sedimentation tank so as to enable the sewage at the bottom of the sedimentation tank to float upwards and flow back to the aeration tank.
Optionally, one end of the aeration tank, which is close to the closed anoxic tank, is provided with a first baffle, two sides of the first baffle are respectively connected to tank walls on two sides of the aeration tank, a gap is formed between the bottom of the first baffle and the bottom of the aeration tank above the bottom of the aeration tank, and the internal reflux gas stripping device is located on one side of the first baffle, which faces the closed anoxic tank;
the aeration tank is characterized in that a second baffle is arranged at one end, close to the sedimentation tank, of the aeration tank, the two sides of the second baffle are respectively connected to the tank walls at the two sides of the aeration tank, the bottom of the second baffle is connected to the bottom of the aeration tank, the height of the second baffle is lower than the depth of the aeration tank, and the large-circulation air lifting device is located on one side, facing the sedimentation tank, of the second baffle.
Optionally, the aeration tank contains denitrifying bacteria and nitrifying bacteria, and a pipe aerator is arranged in the aeration tank and comprises a main pipe, a plurality of branch pipes and a plurality of hoses;
one end of the main pipe is connected to the blower;
one end of each branch pipe is connected with the other end of the main pipe in parallel, the other ends of the branch pipes extend to the bottom of the aeration tank, and each branch pipe is provided with a blow-down valve;
the other end of each branch pipe is connected to one end of one hose, the other end of each hose extends to the wall of the aeration tank, and a plurality of aeration holes are formed in the wall of each hose.
Optionally, a plurality of inclined pipes are arranged in the sedimentation tank, the inclined pipes are arranged in a honeycomb shape, a water collecting weir is arranged above the inclined pipes, a back flushing air pipe and a suction pipe are arranged below the inclined pipes, the back flushing air pipe is connected to the air blower, and the suction pipe is connected to a back flushing drain pipe.
Optionally, the coagulation filtering tank comprises a flocculation sedimentation tank and a filler filtering tank which are sequentially arranged along the flow direction of the sewage;
the flocculation sedimentation tank is internally provided with a plate electrode and is in air stripping connection with a direct-current power supply;
the filter is characterized in that two partition plates are arranged in the filler filter along the horizontal direction, the peripheries of the two partition plates are respectively connected with the wall of the filler filter, a filter material is filled between the two partition plates, a sludge pump and a backwashing aerator pipe are arranged in the filler filter, and the filler filter is connected with a water outlet pipe and a residual sludge discharge pipe.
Optionally, the medicine system includes the flocculating agent and adds the medicine unit, the flocculating agent adds the medicine unit and includes flocculating agent medicine dissolving tank, be equipped with the flocculating agent mixer in the flocculating agent medicine dissolving tank, flocculating agent medicine dissolving tank pass through flocculating agent dosing pump connect in the flocculation sedimentation tank.
Optionally, the dosing system comprises a carbon source adjusting unit, the carbon source adjusting unit comprises a sodium acetate regulator drug dissolving tank, the sodium acetate drug dissolving tank is connected to the closed anoxic tank and the aeration tank through a sodium acetate dosing pump, and a sodium acetate stirrer is arranged in the sodium acetate drug dissolving tank.
Optionally, the control system further comprises an oxidation-reduction potential probe and a dissolved oxygen probe respectively connected to the controller, and the oxidation-reduction potential probe and the dissolved oxygen probe are arranged in the aeration tank;
the air stripping system also comprises a standby air blower.
The beneficial effects of the utility model reside in that:
1. the sewage is mixed with the returned sewage after entering the closed anoxic tank, the influent water is diluted, the concentration of pollutants in the influent water is reduced, the impact of the influent water on nitrobacteria is alleviated, the influent water can provide a carbon source for the denitrifying bacteria in the closed anoxic tank, and the additional increase of the carbon source is not needed, so that partial total nitrogen and COD (chemical oxygen demand) can be removed in a closed anoxic zone; the sewage enters an aeration tank through an overflow port of the closed anoxic tank, the upstream sewage is diluted through the control of DO (dissolved oxygen) in the aeration tank and the internal reflux regulation, and the further removal of ammonia nitrogen, total nitrogen and COD (chemical oxygen demand) and the removal of partial total phosphorus are realized in the aeration tank; and sewage enters a sedimentation tank after passing through an aeration tank to realize sludge-water separation, and effluent of the sedimentation tank enters a coagulation filtering tank, so that SS (suspended solids) and total phosphorus in the effluent are further reduced, and finally the effluent reaches the standard and is discharged. The device has synchronous nitrification and denitrification, can remove the total nitrogen in the sewage under the condition of high-efficient utilization of the carbon source, adopts the mode that sedimentation tank and coagulation filter tank combine together simultaneously, further reduces the content of total phosphorus when controlling out water SS (suspended solid), has efficient, reasonable in design, degree of automation is high, energy-concerving and environment-protective advantage.
2. The air lifting device mainly has the following advantages by taking air of a blower as power: firstly, the number of equipment is reduced by taking air as power, and the failure rate of the equipment is reduced; secondly, the air stripping device can effectively adjust the reflux quantity by adjusting the air inflow quantity; and thirdly, the sludge flocs are not cut, so that the sludge flocs are more favorably formed, and the settleability of the sludge is improved.
3. The stirring rake adopts the hyperboloid agitator to adopt the drive of low-speed variable frequency motor to realize muddy water mixing under the condition of low rotational speed stirring, the great specific surface impeller of cooperation, power is equipped for a short time, and circulating water is big, and the energy consumption is low, and is 30% -50% more energy-conserving than traditional stirring mode, and is little to the mud cutting effect, thereby the size and the closely knit degree of the maintenance sludge floc of at utmost.
4. The sewage backflow is realized through the internal reflux gas stripping device, the large circulation gas stripping device and the external reflux gas stripping device, and the denitrification reaction is promoted while the upstream sewage is diluted.
5. Through arranging a first baffle and an internal reflux gas stripping device, a stripping area is formed at the front end of the aeration tank, so that sewage at the bottom of the aeration tank forms circulation and a large amount of floating sewage is ensured to flow back to the closed anoxic tank; by arranging the second baffle and the large-circulation air lifting device, a buffer area is formed at the rear end of the aeration tank, so that the sewage circulation in the aeration tank is more effective; the head end of the aeration zone is provided with a lifting and pushing zone, the power density is the maximum, the gas content in the mixed liquid is the highest, and therefore the oxygen transfer coefficient is also the highest; under the condition that the whole aeration zone is uniformly aerated, the plug flow disturbance brought by air stripping is reduced along the way along with the water flow direction of the aeration zone, and the total oxygen transfer coefficient at the same tank depth is also reduced along the way; the difference of oxygen consumption rate and oxygen transfer coefficient in space reflects the plug flow characteristics of the dissolved oxygen transfer diffusion and organic matter degradation transfer process, which creates better conditions for the synchronous nitrification and denitrification in the aeration zone.
6. The honeycomb inclined tube is arranged in the sedimentation tank, the sedimentation efficiency is improved by utilizing the shallow layer sedimentation principle, the sedimentation distance of particles is shortened, and the sedimentation time is shortened; the sedimentation area of the sedimentation tank is increased, so that the treatment efficiency is improved; the lower part of the honeycomb inclined tube is provided with the blowing and sweeping air tube, so that the blockage of the inclined tube can be effectively relieved, and the suction and sweeping tube is arranged for cleaning.
7. The flocculation sedimentation tank is simple in structure, convenient and fast to maintain and repair, does not need to supplement medicaments regularly, is provided with air stripping to enable the flocculation sedimentation tank to have two functions of chemical precipitation and micro-bubble air flotation, can effectively and synchronously remove SS (suspended solids) and total phosphorus in sewage, and is cleaner and more environment-friendly than a traditional dosing device because electric energy is clean energy; the filler filter tank is arranged to replace a sand filter tank, the operation period of the filler filter tank can be prolonged to 2-3 days, the filler filter tank can be flushed by adopting an aeration method, the operation and management are simple, the flushing effect is good, the automatic operation is convenient to realize, and meanwhile, the water yield is stable and is not blocked.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout the exemplary embodiments of the present invention.
Fig. 1 shows a schematic structure diagram of a biological denitrification and dephosphorization integrated sewage treatment device according to an embodiment of the present invention.
Description of the reference numerals
1. A water inlet pipe; 2. a water tank; 3. a stirring paddle; 4. an internal reflux gas stripping device; 5. a sodium acetate dosing pump; 6. a sodium acetate stirrer; 7. a sodium acetate medicine dissolving tank; 8. sealing the anoxic tank; 9. a blower; 10. a controller; 11. an oxidation-reduction potential probe; 12. a dissolved oxygen probe; 13. an atmospheric valve; 14. a tubular aerator; 15. an aeration tank; 16. a large-circulation gas stripping device; 17. a flocculant mixer; 18. a flocculant dissolving tank; 19. a flocculant dosing pump; 20. a direct current power supply; 21. an external reflux gas stripping device; 22. a water collection weir; 23. an inclined tube; 24. back flushing the air pipe; 25. a suction pipe; 26. a second baffle; 27. a first baffle plate; 28. a sedimentation tank; 29. an electrode plate; 30. a filler filter chamber; 31. a sludge discharge pump; 32. a surplus sludge discharge pipe; 33. backwashing the drain pipe; 34. a water outlet pipe; 35. and (5) air stripping of the flocculation sedimentation tank.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The utility model provides a biological nitrogen and phosphorus removal integration sewage treatment plant, include:
the closed anoxic tank, the aeration tank, the sedimentation tank and the coagulation filtering tank are sequentially arranged along the flowing direction of the sewage and are sequentially communicated through overflow, and the closed anoxic tank and the aeration tank are respectively communicated with a sewage inlet pipe;
the air stripping system comprises an air blower and a plurality of air stripping devices respectively connected with the air blower, and the plurality of air stripping devices are distributed in the aeration tank and the sedimentation tank so as to realize sewage backflow among the sedimentation tank, the aeration tank and the closed anoxic tank;
the dosing system is used for dosing drugs into the closed anoxic tank and the aeration tank so as to adjust the carbon source of the sewage in the closed anoxic tank and the aeration tank and flocculate and precipitate the sewage in the coagulation filtering tank;
and the control system comprises a controller and a frequency converter, and the controller is connected to the blower through the frequency converter.
Specifically, the sewage is mixed with the returned sewage after entering the closed anoxic tank, the inlet water is diluted, the concentration of pollutants in the inlet water is reduced, the impact of the inlet water on nitrobacteria is alleviated, the inlet water can provide a carbon source for the denitrifying bacteria in the closed anoxic tank, and the carbon source does not need to be additionally added, so that part of total nitrogen and COD (chemical oxygen demand) can be removed in a closed anoxic zone; the sewage enters an aeration tank through an overflow port of the closed anoxic tank, the upstream sewage is diluted through the control of DO (dissolved oxygen) in the aeration tank and the internal reflux regulation, and the further removal of ammonia nitrogen, total nitrogen and COD (chemical oxygen demand) and the removal of partial total phosphorus are realized in the aeration tank; and sewage enters a sedimentation tank after passing through an aeration tank to realize sludge-water separation, and effluent of the sedimentation tank enters a coagulation filtering tank, so that SS (suspended solids) and total phosphorus in the effluent are further reduced, and finally the effluent reaches the standard and is discharged. The device has synchronous nitrification and denitrification, can remove the total nitrogen in the sewage under the condition of high-efficient utilization of the carbon source, adopts the mode that sedimentation tank and coagulation filter tank combine together simultaneously, further reduces the content of total phosphorus when controlling out water SS (suspended solid), has efficient, reasonable in design, degree of automation is high, energy-concerving and environment-protective advantage.
Further, the air stripping device mainly has the following advantages by using air of a blower as power: firstly, the number of equipment is reduced by taking air as power, and the failure rate of the equipment is reduced; secondly, the air stripping device can effectively adjust the reflux quantity by adjusting the air inflow quantity; and thirdly, the sludge flocs are not cut, so that the sludge flocs are more favorably formed, and the settleability of the sludge is improved.
The water tanks can be arranged at the water inlet positions of the closed anoxic tank and the aeration tank, and the water tanks are arranged to realize sectional water inlet, so that the nitration reaction of sewage can be further enhanced, and the nitration rate is improved.
As an alternative scheme, denitrifying bacteria are contained in the closed anoxic tank, and a stirring paddle is arranged in the closed anoxic tank and connected to a driving motor;
wherein, the stirring rake is the hyperboloid stirring rake, and the material is glass steel, and driving motor is low-speed variable frequency motor.
Specifically, the stirring paddle adopts a hyperboloid stirrer, and adopts a low-speed variable-frequency motor to drive so as to realize mud-water mixing under the condition of low-speed stirring, and the stirring paddle is matched with a large-specific-surface-area impeller, so that the power is small, the circulating water flow is large, the energy consumption is low, the energy is saved by 30% -50% compared with the traditional stirring mode, the sludge cutting effect is small, and the size and compactness of sludge flocs are maintained to the maximum extent.
As an alternative, the plurality of gas stripping devices comprise an internal reflux gas stripping device, a large circulation gas stripping device and an external reflux gas stripping device;
the internal reflux gas stripping device is arranged at the bottom of the aeration tank and is positioned at one end of the aeration tank close to the closed anoxic tank so as to enable sewage at the bottom of the aeration tank to float upwards and flow back to the closed anoxic tank;
the large-circulation gas stripping device is arranged at the bottom of the aeration tank and is positioned at one end of the aeration tank close to the sedimentation tank, so that the sewage at the bottom of the rear end of the aeration tank floats upwards and flows back to the front end of the aeration tank;
the external reflux gas stripping device is arranged at the bottom of the sedimentation tank so as to enable the sewage at the bottom of the sedimentation tank to float upwards and flow back to the aeration tank.
Specifically, sewage backflow is realized through the internal reflux gas stripping device, the large circulation gas stripping device and the external reflux gas stripping device, and the denitrification reaction is promoted while upstream sewage is diluted.
As an alternative, a first baffle is arranged at one end of the aeration tank close to the closed anoxic tank, two sides of the first baffle are respectively connected to tank walls at two sides of the aeration tank, a gap is formed between the bottom of the first baffle and the bottom of the aeration tank above the bottom of the aeration tank, and the internal reflux gas stripping device is positioned at one side of the first baffle facing the closed anoxic tank;
the one end that is close to the sedimentation tank of aeration tank is equipped with the second baffle, and the both sides of second baffle are connected respectively in the pool wall of aeration tank both sides, and the bottom of second baffle is connected in the bottom of the pool of aeration tank, and the degree of depth that highly is less than the aeration tank of second baffle, and the macrocycle air stripping device is located one side of the orientation sedimentation tank of second baffle.
Specifically, a first baffle and an internal reflux air lifting device are arranged, and a lifting area is formed at the front end of an aeration tank, so that sewage at the bottom of the aeration tank forms circulation and a large amount of floating sewage is guaranteed to flow back to the closed anoxic tank; by arranging the second baffle and the large-circulation air lifting device, a buffer area is formed at the rear end of the aeration tank, so that the sewage circulation in the aeration tank is more effective; the head end of the aeration zone is provided with a lifting and pushing zone, the power density is the maximum, the gas content in the mixed liquid is the highest, and therefore the oxygen transfer coefficient is also the highest; under the condition that the whole aeration zone is uniformly aerated, the plug flow disturbance brought by air stripping is reduced along the way along with the water flow direction of the aeration zone, and the total oxygen transfer coefficient at the same tank depth is also reduced along the way; the difference of oxygen consumption rate and oxygen transfer coefficient in space reflects the plug flow characteristics of the dissolved oxygen transfer diffusion and organic matter degradation transfer process, which creates better conditions for the synchronous nitrification and denitrification in the aeration zone.
As an alternative scheme, denitrifying bacteria and nitrifying bacteria are contained in an aeration tank, and a tubular aerator is arranged in the aeration tank and comprises a main pipe, a plurality of branch pipes and a plurality of hoses;
one end of the main pipe is connected with the blower;
one end of each branch pipe is connected in parallel with the other end of the main pipe, the other ends of the branch pipes extend to the bottom of the aeration tank, the branch pipes are provided with emptying valves, and the branch pipes are connected through valves;
the other end of each branch pipe is connected with one end of a hose, the other end of the hose extends to the wall of the aeration tank, and a plurality of aeration holes are arranged on the wall of the hose.
Specifically, the hose adopts modified PU material, adopts clamp and branch connection, is equipped with a plurality of fixing device on every hose, and fixing device can adopt the form of PVC clamp.
Further, be responsible for and all adopt stainless steel material with the branch pipe, be responsible for and be connected through the stainless steel buckle between the branch pipe. The hose is fixed on the wall of the aeration tank through a high-strength nylon rope.
Furthermore, the PU material has the characteristics of high bending strength and durability, and the hose is provided with the holes, so that the water outlet bubbles have small particle size, long retention time in water and higher oxygen utilization rate. And the main pipe, the manifold and the hose are all independently installed, namely each pipe fitting can be independently replaced under the condition of not influencing production.
As an alternative scheme, a plurality of inclined pipes are arranged in the sedimentation tank, the inclined pipes are arranged in a honeycomb shape, a water collecting weir is arranged above the inclined pipes, a backwashing air pipe and a suction and sweeping pipe are arranged below the inclined pipes, the backwashing air pipe is connected with an air blower, and the suction and sweeping pipe is connected with a backwashing drain pipe.
Specifically, the honeycomb inclined tube is arranged in the sedimentation tank, the sedimentation efficiency is improved by utilizing the shallow layer sedimentation principle, and the sedimentation distance of particles is shortened, so that the sedimentation time is shortened; the sedimentation area of the sedimentation tank is increased, so that the treatment efficiency is improved; the lower part of the honeycomb inclined tube is provided with the blowing and sweeping air tube, so that the blockage of the inclined tube can be effectively relieved, and the suction and sweeping tube is arranged for cleaning.
Furthermore, the inclined tube is a hexagonal tube and is made of PP (polypropylene), the backwashing gas tube is processed in a nonstandard mode and is made of UPVC (unplasticized polyvinyl chloride), and the tube wall is obliquely perforated downwards.
As an alternative, the coagulation filtering tank comprises a flocculation sedimentation tank and a filler filtering tank which are sequentially arranged along the flowing direction of the sewage;
the flocculation sedimentation tank is internally provided with a plate electrode and air stripping of the flocculation sedimentation tank, the plate electrode is connected with a direct-current power supply, and the air stripping of the flocculation sedimentation tank is connected with an air blower;
two partition plates are arranged in the filler filter tank along the horizontal direction, the peripheries of the two partition plates are respectively connected with the tank wall of the filler filter tank, a filter material is filled between the two partition plates, a sludge discharge pump and a backwashing aeration pipe are arranged in the filler filter tank, and the filler filter tank is connected with a water outlet pipe and a residual sludge discharge pipe.
Specifically, the flocculation sedimentation tank is simple in structure, convenient and fast to maintain and overhaul, and does not need to supplement medicaments regularly, the air stripping of the flocculation sedimentation tank is arranged to enable the flocculation sedimentation tank to have two functions of chemical precipitation and micro-bubble air flotation, SS (suspended solids) and total phosphorus in sewage can be effectively and synchronously removed, and electric energy is clean energy, so that the flocculation sedimentation tank is more clean and environment-friendly than a traditional dosing device; the filler filter tank is arranged to replace a sand filter tank, the operation period of the filler filter tank can be prolonged to 2-3 days, the filler filter tank can be flushed by adopting an aeration method, the operation and management are simple, the flushing effect is good, the automatic operation is convenient to realize, and meanwhile, the water yield is stable and is not blocked.
Furthermore, the electrode adopts a particle micropore structure, the power supply adopts an adjustable direct current stabilized power supply, the output voltage is 0-12V, the maximum output power is 6000W, and the output current is 0-500A; the filler filter is filled with soft filler, preferably new polyurethane biological filler.
As an alternative scheme, the dosing system comprises a flocculating agent dosing unit, the flocculating agent dosing unit comprises a flocculating agent medicine dissolving tank, a flocculating agent stirrer is arranged in the flocculating agent medicine dissolving tank, and the flocculating agent medicine dissolving tank is connected to the flocculation sedimentation tank through a flocculating agent dosing pump.
Specifically, two flocculating agent dosing pumps are arranged, one for one and the other for standby.
As an alternative scheme, the medicine adding system comprises a carbon source adjusting unit, the carbon source adjusting unit comprises a sodium acetate medicine dissolving tank, the sodium acetate medicine dissolving tank is connected to the closed anoxic tank and the aeration tank through a sodium acetate medicine adding pump, and a sodium acetate stirrer is arranged in the sodium acetate medicine dissolving tank.
Specifically, two sodium acetate dosing pumps are arranged and are used for preparing one by one
As an alternative, the control system also comprises an oxidation-reduction potential probe and a dissolved oxygen probe which are respectively connected with the controller, and the oxidation-reduction potential probe and the dissolved oxygen probe are arranged in the aeration tank;
a backup blower is also included in the stripping system.
Specifically, although the measurement index of the oxidation-reduction potential cannot be used as an index of the concentration of certain oxidizing substances and reducing substances, the measurement index is helpful for knowing the electrochemical characteristics of the water body and analyzing the properties of the water body, and is a comprehensive index, and the higher the oxidation-reduction potential is, the more thoroughly the pollutants in the water are filtered; the dissolved oxygen amount refers to the dissolved amount of oxygen in water;
the controller can utilize the converter to control the rotational speed of air-blower according to the numerical value that oxidation reduction potential probe and dissolved oxygen volume probe monitored, when oxidation reduction potential and dissolved oxygen volume are less than the setting value in the water, increase the rotational speed of air-blower and then increase the aeration rate in the aeration tank, when oxidation reduction potential and dissolved oxygen volume reach the setting value, resume former rotational speed.
Furthermore, a standby air blower is arranged, the phenomenon that the failure of the air blower causes the stop of the device is prevented, and the maintenance and the replacement can be realized without stopping.
Examples
FIG. 1 shows a schematic structure diagram of the integrated sewage treatment device for biological nitrogen and phosphorus removal of the present embodiment.
As shown in FIG. 1, the integrated sewage treatment device for biological denitrification and dephosphorization comprises:
the sewage treatment device comprises a closed anoxic tank 8, an aeration tank 15, a sedimentation tank 28 and a condensation filtering tank which are sequentially arranged along the flowing direction of sewage and are sequentially communicated through overflow, a water inlet pipe 1 of the sewage is respectively communicated with the closed anoxic tank 8 and the aeration tank 15, and water tanks 2 are respectively arranged at the water inlet positions of the closed anoxic tank 8 and the aeration tank 15;
denitrifying bacteria are contained in the closed anoxic tank 8, a stirring paddle 3 is arranged in the closed anoxic tank 8, and the stirring paddle 3 is connected with a driving motor, wherein the stirring paddle 3 is a hyperboloid stirring paddle 3, the material of the stirring paddle 3 is glass fiber reinforced plastic, and the driving motor is a low-speed variable-frequency motor;
denitrifying bacteria and nitrifying bacteria are contained in the aeration tank 15, a tubular aerator 14 is arranged in the aeration tank 15, and the tubular aerator 14 comprises a main pipe, a plurality of branch pipes and a plurality of hoses; one end of the main pipe is connected with the blower 9; one end of each branch pipe is connected in parallel with the other end of the main pipe, the other ends of the branch pipes extend to the bottom of the aeration tank 15, and the branch pipes are provided with emptying valves 13; the other end of each branch pipe is connected with one end of a hose, the other end of the hose extends to the wall of the aeration tank 15, and the pipe wall of the hose is provided with a plurality of aeration holes;
wherein, the hose is made of modified PU material, the nominal external diameter is 65mm, the thickness is 0.5-0.6mm, and the distance between aeration holes is 5 mm. The hose is connected with the branch pipe by a hoop. The hose interval is 20cm, and the interval 60cm sets up aeration pipe fixing device, and fixing device adopts the form of PVC clamp.
As a further improvement, the main pipe and the branch pipe are made of stainless steel, and the main pipe and the branch pipe are connected in a stainless steel buckle mode. One end of the hose is fixedly connected with the branch pipe, and the other end of the hose is fixed on the wall of the aeration tank 15 through a high-strength nylon rope.
A plurality of inclined pipes 23 are arranged in the sedimentation tank 28, the inclined pipes 23 are arranged in a honeycomb shape, a water collecting weir 22 is arranged above the inclined pipes 23, a backwashing air pipe 24 and a suction and sweeping pipe 25 are arranged below the inclined pipes 23, the backwashing air pipe 24 is connected with the air blower 9, and the suction and sweeping pipe 25 is connected with a backwashing water discharge pipe 33;
wherein, the surface load of the sedimentation tank 28 is 0.3m3/m2H, solid load 0.5kgDS/m2D, the inclined tube 23 is hexagonal, 5cm in side length and 60 degrees in inclination angle. The backwashing gas pipe is processed in a nonstandard mode, is made of UPVC (unplasticized polyvinyl chloride), has the pipe diameter of 63mm, is obliquely opened downwards by 45 degrees, and has the hole interval of 5cm and the hole diameter of 3 mm.
The coagulation filtering tank comprises a flocculation sedimentation tank and a filler filtering tank 30 which are sequentially arranged along the flowing direction of the sewage;
an electrode plate 29 and a flocculation sedimentation tank air stripping 35 are arranged in the flocculation sedimentation tank, the electrode plate 29 is connected with a direct current power supply 20, and the flocculation sedimentation tank air stripping 35 is connected with an air blower 9;
two partition plates are arranged in the filler filter 30 along the horizontal direction, the peripheries of the two partition plates are respectively connected with the wall of the filler filter 30, filter materials are filled between the two partition plates, a sludge pump 31 and a backwashing aerator pipe are arranged in the filler filter 30, and the filler filter 30 is connected with a water outlet pipe 34 and a residual sludge discharge pipe 32;
the electrode plate 29 adopts an adjustable DC stabilized voltage power supply, the output voltage is 0-12V, the maximum output power is 6000W, and the output current is 0-500A; the filling filter 30 area is filled with novel polyurethane biological filling, the filling shape is 30 × 30mm, and the density: 25kg/m 3; the pore diameter is 25-30 ppi; the opening rate is more than or equal to 95 percent.
The gas system comprises a blower 9, and an internal reflux gas stripping device 4, a large circulation gas stripping device 16 and an external reflux gas stripping device 21 which are respectively connected with the blower 9;
a first baffle 27 is arranged at one end of the aeration tank 15 close to the closed anoxic tank 8, two sides of the first baffle 27 are respectively connected to tank walls at two sides of the aeration tank 15, the bottom of the first baffle 27 is positioned above the tank bottom of the aeration tank 15, and the internal reflux gas lifting device 4 is positioned at one side of the first baffle 27 facing the closed anoxic tank 8, so that sewage at the bottom of the aeration tank 15 floats upwards and flows back to the closed anoxic tank 8;
a second baffle 26 is arranged at one end of the aeration tank 15 close to the sedimentation tank 28, two sides of the second baffle 26 are respectively connected to the tank walls at two sides of the aeration tank 15, the bottom of the second baffle 26 is connected to the tank bottom of the aeration tank 15, the height of the second baffle 26 is lower than the depth of the aeration tank 15, and the large-circulation air-lifting device 16 is positioned at one side of the second baffle 26 facing the sedimentation tank 28, so that the sewage at the bottom of the rear end of the aeration tank 15 floats upwards and flows back to the front end of the aeration tank 15;
the external reflux air stripping device 21 is arranged at the bottom of the sedimentation tank 28 so as to enable the sewage at the bottom of the sedimentation tank 28 to float upwards and flow back to the aeration tank 15.
Wherein, the air stripping system also comprises a standby blower 9.
The dosing system comprises a flocculating agent dosing unit, the flocculating agent dosing unit comprises a flocculating agent medicine dissolving tank 18, a flocculating agent stirrer 17 is arranged in the flocculating agent medicine dissolving tank 18, and the flocculating agent medicine dissolving tank 18 is connected to a flocculation sedimentation tank 28 through a flocculating agent dosing pump 19; the medicine system still includes the PH regulating unit, and the PH regulating unit includes sodium acetate medicine dissolving tank 7, and sodium acetate medicine dissolving tank 7 passes through sodium acetate dosing pump 5 to be connected in airtight oxygen deficiency pond 8 and aeration tank 15, is equipped with sodium acetate mixer 6 in the sodium acetate medicine dissolving tank 7.
Wherein, sodium acetate can be used for adjusting the PH value, the flocculating agent adopts PAM (polyacrylamide), and the flocculating agent dosing pump 19 and the sodium acetate dosing pump 5 are both used and prepared.
The control system comprises a controller 10, and a frequency converter, an oxidation-reduction potential probe 11 and a dissolved oxygen probe 12 which are respectively connected with the controller 10, wherein the frequency converter is connected with the blower 9, and the oxidation-reduction potential probe 11 and the dissolved oxygen probe 12 are arranged in an aeration tank 15; the controller 10 adjusts the rotating speed of the blower 9 through a frequency converter according to the monitoring data of the oxidation-reduction potential probe 11 and the dissolved oxygen probe 12;
wherein, the controller 10 is a PLC.
The main process flow of the device is as follows: the inlet water firstly enters the closed anoxic zone, the inlet water is mixed with the internal reflux, the denitrification reaction is realized by fully utilizing the carbon source required by the inlet water, and partial total nitrogen and COD (chemical oxygen demand) can be removed in the closed anoxic zone. Sewage enters an aeration zone through an overflow port of the anoxic zone, and a tubular aerator which can be replaced on line is adopted in the aeration zone. Further removal of ammonia nitrogen, total nitrogen and COD (chemical oxygen demand) and removal of part of total phosphorus can be realized in the aeration zone through control of DO (dissolved oxygen) and internal reflux regulation in the aeration zone. The sewage enters the water rapid clarification area after passing through the aeration area, so that the sludge-water separation is realized. And the effluent of the rapid clarification zone enters an electrocoagulation tank, so that the effluent further reduces the targets of SS (suspended solids) and total phosphorus under the action of electrocoagulation, and finally the discharge after reaching the standard is realized.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The utility model provides a biological nitrogen and phosphorus removal integration sewage treatment plant which characterized in that includes:
the sewage treatment device comprises a closed anoxic tank, an aeration tank, a sedimentation tank and a coagulation filtering tank which are sequentially arranged along the flowing direction of sewage and are sequentially communicated through overflow, wherein the closed anoxic tank and the aeration tank are respectively communicated with a sewage inlet pipe;
the gas stripping system comprises an air blower and a plurality of gas stripping devices respectively connected with the air blower, and the plurality of gas stripping devices are distributed in the aeration tank and the sedimentation tank so as to realize sewage backflow among the sedimentation tank, the aeration tank and the closed anoxic tank;
the dosing system is used for dosing the closed anoxic tank and the aeration tank so as to adjust a carbon source of the sewage in the closed anoxic tank and the aeration tank and flocculate and precipitate the sewage in the coagulation and filtration tank;
the control system comprises a controller and a frequency converter, and the controller is connected to the air blower through the frequency converter.
2. The integrated sewage treatment device for biological nitrogen and phosphorus removal of claim 1, wherein denitrifying bacteria are contained in the closed anoxic tank, and a stirring paddle is arranged in the closed anoxic tank and connected to a driving motor;
wherein, the stirring rake is the hyperboloid stirring rake, and the material is glass steel, driving motor is low-speed variable frequency motor.
3. The integrated sewage treatment plant of claim 1, wherein the plurality of gas stripping devices comprise an internal reflux gas stripping device, a large circulation gas stripping device and an external reflux gas stripping device;
the internal reflux gas stripping device is arranged at the bottom of the aeration tank and is positioned at one end of the aeration tank close to the closed anoxic tank, so that the sewage at the bottom of the aeration tank floats upwards and flows back to the closed anoxic tank;
the large circulation gas stripping device is arranged at the bottom of the aeration tank and is positioned at one end of the aeration tank close to the sedimentation tank, so that sewage at the bottom of the rear end of the aeration tank floats upwards and flows back to the front end of the aeration tank;
the external reflux gas stripping device is arranged at the bottom of the sedimentation tank so as to enable the sewage at the bottom of the sedimentation tank to float upwards and flow back to the aeration tank.
4. The integrated sewage treatment plant of claim 3, wherein a first baffle is disposed at one end of the aeration tank close to the closed anoxic tank, two sides of the first baffle are respectively connected to the tank walls at two sides of the aeration tank, a gap is formed between the bottom of the first baffle and the bottom of the aeration tank above the bottom of the aeration tank, and the internal reflux gas stripping device is disposed at one side of the first baffle facing the closed anoxic tank;
the aeration tank is characterized in that a second baffle is arranged at one end, close to the sedimentation tank, of the aeration tank, the two sides of the second baffle are respectively connected to the tank walls at the two sides of the aeration tank, the bottom of the second baffle is connected to the bottom of the aeration tank, the height of the second baffle is lower than the depth of the aeration tank, and the large-circulation air lifting device is located on one side, facing the sedimentation tank, of the second baffle.
5. The integrated sewage treatment plant of claim 1, wherein the aeration tank contains denitrifying bacteria and nitrifying bacteria, and a tubular aerator is arranged in the aeration tank, and comprises a main pipe, a plurality of branch pipes and a plurality of hoses;
one end of the main pipe is connected to the blower;
one end of each branch pipe is connected with the other end of the main pipe in parallel, the other ends of the branch pipes extend to the bottom of the aeration tank, and each branch pipe is provided with a blow-down valve;
the other end of each branch pipe is connected to one end of one hose, the other end of each hose extends to the wall of the aeration tank, and a plurality of aeration holes are formed in the wall of each hose.
6. The integrated sewage treatment device for biological nitrogen and phosphorus removal of claim 1, wherein a plurality of inclined pipes are arranged in the sedimentation tank, the inclined pipes are arranged in a honeycomb shape, a water collecting weir is arranged above the inclined pipes, a back flushing air pipe and a suction and sweeping pipe are arranged below the inclined pipes, the back flushing air pipe is connected with the air blower, and the suction and sweeping pipe is connected with a back flushing drain pipe.
7. The integrated sewage treatment plant of claim 1, wherein the coagulation filtration tank comprises a flocculation sedimentation tank and a filler filtration tank which are arranged in sequence along the flow direction of the sewage;
the flocculation sedimentation tank is internally provided with a plate electrode and is in air stripping connection with a direct-current power supply;
the filter is characterized in that two partition plates are arranged in the filler filter along the horizontal direction, the peripheries of the two partition plates are respectively connected with the wall of the filler filter, a filter material is filled between the two partition plates, a sludge pump and a backwashing aerator pipe are arranged in the filler filter, and the filler filter is connected with a water outlet pipe and a residual sludge discharge pipe.
8. The integrated sewage treatment plant of claim 7, wherein the dosing system comprises a flocculant dosing unit, the flocculant dosing unit comprises a flocculant dissolving tank, a flocculant stirrer is arranged in the flocculant dissolving tank, and the flocculant dissolving tank is connected to the flocculation sedimentation tank through a flocculant dosing pump.
9. The integrated sewage treatment device for biological nitrogen and phosphorus removal of claim 1, wherein the dosing system comprises a carbon source adjusting unit, the carbon source adjusting unit comprises a sodium acetate drug dissolving tank, the sodium acetate drug dissolving tank is connected to the closed anoxic tank and the aeration tank through a sodium acetate dosing pump, and a sodium acetate stirrer is arranged in the sodium acetate drug dissolving tank.
10. The integrated sewage treatment device for biological nitrogen and phosphorus removal of claim 1, wherein the control system further comprises an oxidation-reduction potential probe and an oxygen-dissolved probe respectively connected to the controller, and the oxidation-reduction potential probe and the oxygen-dissolved probe are arranged in the aeration tank;
the air stripping system also comprises a standby air blower.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113772890A (en) * | 2021-09-22 | 2021-12-10 | 桂林理工大学 | A sewage treatment system and treatment method based on AO-MBBR-inductive coupling filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113772890A (en) * | 2021-09-22 | 2021-12-10 | 桂林理工大学 | A sewage treatment system and treatment method based on AO-MBBR-inductive coupling filter |
| CN113772890B (en) * | 2021-09-22 | 2024-02-27 | 桂林理工大学 | Sewage treatment system and treatment method based on AO-MBBR-inductively coupled filter tank |
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