CN115536152A - Sewage low temperature denitrification processing system - Google Patents
Sewage low temperature denitrification processing system Download PDFInfo
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- CN115536152A CN115536152A CN202211246551.7A CN202211246551A CN115536152A CN 115536152 A CN115536152 A CN 115536152A CN 202211246551 A CN202211246551 A CN 202211246551A CN 115536152 A CN115536152 A CN 115536152A
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- 239000010865 sewage Substances 0.000 title claims abstract description 69
- 238000012545 processing Methods 0.000 title claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000010802 sludge Substances 0.000 claims abstract description 53
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000010992 reflux Methods 0.000 claims abstract description 42
- 239000012528 membrane Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 25
- 230000001546 nitrifying effect Effects 0.000 claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 36
- 229910052760 oxygen Inorganic materials 0.000 claims description 36
- 239000001301 oxygen Substances 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 20
- 238000005273 aeration Methods 0.000 claims description 18
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
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- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 206010021143 Hypoxia Diseases 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 6
- 230000001105 regulatory effect Effects 0.000 claims 2
- 230000002950 deficient Effects 0.000 claims 1
- 239000002351 wastewater Substances 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052799 carbon Inorganic materials 0.000 abstract description 11
- 241000894006 Bacteria Species 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/006—Regulation methods for biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/08—Aerobic processes using moving contact bodies
- C02F3/082—Rotating biological contactors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a sewage low-temperature denitrification treatment system, which belongs to the technical field of sewage treatment and comprises an anoxic tank, an adjustable combined tank, an MBR (membrane bioreactor) membrane tank, a biological rotating disc, a movable baffle, a guide driving mechanism and the like, wherein the biological rotating disc is arranged in the anoxic tank, the movable baffle divides the inner space of the adjustable combined tank into the adjustable anoxic tank and the adjustable aerobic tank, the guide driving mechanism is used for driving the movable baffle to move so as to adjust the proportion of the adjustable anoxic tank and the adjustable aerobic tank, internal reflux flows back to the anoxic tank from the tail end of the aerobic tank, and sludge reflux flows back to the anoxic tank from the MBR membrane tank. Compared with the prior art, the anaerobic zone and the anoxic zone of the existing equipment are combined, the biological rotating disk is installed in the anaerobic zone, nitrifying liquid and sludge can flow back to the front end of the biological rotating disk zone, an additional carbon source is not needed, the utilization rate of a raw water carbon source is improved, the removal efficiency of the total nitrogen in the sewage can reach 75-85% in a low-temperature environment, and the removal efficiency is at least improved by 30% compared with that of the traditional equipment.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a low-temperature sewage denitrification treatment system.
Background
With the rapid development of the economy and the acceleration of the urbanization pace of China, the living standard of rural residents is greatly improved. Rural water supply business is continuously developed, and rural domestic drainage is continuously increased due to popularization of sanitary facilities such as showers, washing machines, toilet flushing and the like. The pollution problem of rural domestic sewage is a non-negligible problem, and needs to be solved urgently.
The integrated sewage treatment equipment has a series of advantages of low investment, low energy consumption, high treatment efficiency, small occupied area, convenient management and the like, and is popularized in rural areas. With the further improvement of the control of the rural sewage quality discharge standard on total nitrogen and ammonia nitrogen, the requirement on the denitrification of the integrated equipment is higher and higher.
Currently, the main process of sewage treatment is still biological treatment, and denitrification by low-temperature sewage treatment is a great challenge in the sewage treatment industry. In addition, the existing integrated sewage treatment equipment has the problems of low denitrification efficiency and unstable effluent quality under the low-temperature condition in winter, and the problems seriously affect the standard reaching rate of sewage treatment. When the temperature is low in winter, particularly the temperature is lower than 12 ℃, the denitrification efficiency of the biochemical system is greatly reduced. The main reason is that the low-temperature environment is not very beneficial to the growth and metabolism of microorganisms and the removal of pollutants in water, the low temperature can cause the change of microbial community structure, the reduction of growth rate, the deterioration of physiological characteristics and the like, but filamentous bacteria are relatively active, and the changes directly influence the effluent quality of the integrated equipment, so that the effluent ammonia nitrogen and the total nitrogen do not reach the standard.
Aiming at the reasons, the invention researches a method for efficiently denitrifying under a low-temperature condition, provides a method for strengthening the low-temperature denitrification of rural integrated sewage treatment equipment, is beneficial to improving the effluent quality of the integrated equipment, and has important environmental value.
Disclosure of Invention
Aiming at the technical problem, the invention provides a sewage low-temperature denitrification treatment system, the scheme combines the anaerobic zone and the anoxic zone of the existing equipment, and the biological rotating disk is arranged in the anaerobic zone, so that nitrifying liquid and sludge can flow back to the front end of the biological rotating disk zone, no additional carbon source is needed, the utilization rate of a raw water carbon source is improved, the removal efficiency of the sewage total nitrogen can reach 75-85% in a low-temperature environment, and is at least improved by 30% compared with the removal efficiency of the traditional equipment.
The invention solves the problems through the following technical means:
the utility model provides a sewage low temperature denitrogenation processing system which characterized in that, includes oxygen deficiency pond, adjustable combination pond, MBR membrane cisterna, biological rotating disc, movable baffle, direction actuating mechanism, interior return line and mud return line, wherein: the anoxic tank is integrally communicated with one end of the adjustable combined tank, and the other end of the adjustable combined tank is communicated with the bottom of the MBR membrane tank through a pipeline; the biological rotating disc is arranged inside the anoxic tank; the movable baffle is arranged in the adjustable combined tank, the inner space of the adjustable combined tank is divided into an adjustable anoxic tank and an adjustable aerobic tank, aeration pipelines are uniformly arranged at the bottom of the adjustable combined tank, a plurality of bottom plates are arranged among the aeration pipelines, the top of each bottom plate can be matched and sealed with the bottom of the movable baffle, and a water outlet is formed in one side of each bottom plate; the guide driving mechanism is used for driving the movable baffle to move so as to adjust the proportion of the adjustable anoxic tank and the adjustable aerobic tank; the internal reflux pipeline comprises an internal reflux pump and an internal reflux pipe, the internal reflux pump is arranged at the bottom of the adjustable aerobic tank, one end of the internal reflux pipe is communicated with the internal reflux pump, and the other end of the internal reflux pipe sequentially penetrates through the adjustable aerobic tank and the adjustable anoxic tank and then is arranged in the anoxic tank; the sludge return pipeline comprises a sludge return pump and a sludge return pipe, the sludge return pump is arranged at the bottom of the MBR membrane tank, one end of the sludge return pipe is communicated with the sludge return pump, and the other end of the sludge return pump sequentially penetrates through the MBR membrane tank, the adjustable aerobic tank and the adjustable anoxic tank and then is arranged in the anoxic tank.
Preferably, the anoxic tank is communicated with the water inlet pipe, the top of the anoxic tank is provided with a sliding cover, and the inside of the anoxic tank is provided with a flow impeller.
Preferably, the top of the adjustable combined tank and the MBR membrane tank is provided with a top plate and a sliding plate.
Preferably, the aeration pipeline is divided into a first area pipeline, a second area pipeline and a third area pipeline which are independently controlled, and the bottom plate is divided into a first bottom plate, a second bottom plate and a third bottom plate, wherein: the first zone ducts are arranged between the first floor and the second floor; the second zone ducts are arranged between the second floor and the third floor; and the third area pipeline is arranged between the third bottom plate and the inner wall of the other end of the adjustable combined tank.
Preferably, an MBR membrane module is arranged inside the MBR membrane tank and is communicated with a drain pipe; the MBR membrane tank is communicated with the adjustable combined tank through a drain pipe at the bottom.
Preferably, the biological rotating disc comprises a mounting beam, a bearing seat, a rotating shaft, a rotating disc and a rotating disc motor, wherein: the mounting beam is used as a bearing part and is arranged in the anoxic pond; the bearing seat is arranged on the mounting beam; two ends of the rotating shaft are arranged in the bearing seats; the plurality of turnplates are sequentially sleeved on the rotating shaft; the motor is arranged on one side of the mounting beam, and the turntable motor drives the rotating shaft to rotate through the speed reducer and the coupling; the rotary disc is composed of a central seat and a plurality of fan-shaped frames arranged around the central seat, and fan-shaped biological sheets are filled in the fan-shaped frames.
Preferably, the bottom of the plate body of the movable baffle is provided with a bottom sealing strip, the two sides of the plate body are provided with side sealing strips, the top of the movable baffle is fixedly connected with a movable beam, the two ends of the movable beam are provided with sliding blocks, the sliding blocks are movably sleeved on sliding rails, and the sliding rails are arranged on the two sides of the top of the adjustable combined pool.
Preferably, the guiding driving mechanism comprises a rack, a moving gear, a transmission shaft, a transmission gear set and a guiding motor, wherein: the two racks are arranged on two sides of the top of the adjustable combined pool; the moving gear is meshed with the rack; the movable gears at two ends are sleeved at the tail ends of two sides of the transmission shaft, and the middle part of the transmission shaft is connected with the guide motor through the transmission gear set; the transmission gear set comprises a worm gear, a bevel gear set or a bevel gear set.
A sewage low-temperature denitrification treatment system comprises the following control steps:
step 1), controlling the water inlet temperature of sewage of a system to be 8-12 ℃;
step 2) detecting the quality of sewage inflow water of the system in real time, wherein detection indexes comprise a COD (chemical oxygen demand) value, an ammonia nitrogen value and a total nitrogen value;
and 3) controlling the water inflow of the sewage, the rotating speed of the biological rotating disc, the dissolved oxygen amount of the anoxic tank, the dissolved oxygen amount of the aerobic zone, the reflux amount of the nitrifying liquid, the reflux amount of the sludge, the MLSS value of the adjustable combined tank and the proportion of the adjustable anoxic tank and the adjustable aerobic tank based on the detection indexes.
A sewage low-temperature denitrification treatment system comprises the following control method:
method 1) when the water inlet temperature of the sewage is 10-12 ℃, the COD value is 200-300mg/L, the ammonia nitrogen value is 30-40mg/L and the total nitrogen value is 40-50mg/L, controlling the water inflow of the sewage to be 8-8.5m 3 The rotating speed of the biological rotating disc is 6-8r/min, the dissolved oxygen content of the anoxic tank is 2-3mg/L, the dissolved oxygen content of the aerobic zone is 2-4mg/L, the reflux amount of the nitrifying liquid is 200-250%, the reflux amount of the sludge is 50-100%, the MLSS value of the adjustable combined tank is 2500-3000mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:3.5 to 1;
method 2) controlling the water inflow of the sewage to be 8-8.5m when the water inflow temperature of the sewage is 10-12 ℃, the COD value is 250-300mg/L, the ammonia nitrogen value is 35-45mg/L and the total nitrogen value is 50-60mg/L 3 H, the rotating speed of the biological rotating disc is 7-8r/min, the dissolved oxygen content of the anoxic tank is 2-2.5mg/L, the dissolved oxygen content of the aerobic zone is 2-4mg/L, the reflux quantity of the nitrifying liquid is 250-300%, the reflux quantity of the sludge is 70-100%, the MLSS value of the adjustable combined tank is 3000-3500mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.6 to 1;
method 3) controlling the water inflow of the sewage to be 8-8.5m when the water inflow temperature of the sewage is 8-12 ℃, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L and the total nitrogen value is 55-70mg/L 3 H, the rotating speed of the biological rotating disc is 8-9r/min, the dissolved oxygen content of the anoxic tank is 1.5-2mg/L, the dissolved oxygen content of the aerobic zone is 3-4mg/L, the return flow of the nitrifying liquid is 300-350%, the return flow of the sludge is 80-100%, the MLSS value of the adjustable combined tank is 3500-4000mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.2 to 1;
method 4) controlling the water inflow of the sewage to be 8-8.5m when the water inflow temperature of the sewage is 8-10 ℃, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L and the total nitrogen value is 55-70mg/L 3 H, the rotating speed of the biological rotating disc is 8-9r/min, the dissolved oxygen content of the anoxic tank is 1.5-2mg/L, the dissolved oxygen content of the aerobic zone is 3-4mg/L, the reflux quantity of the nitrifying liquid is 300-350%, the reflux quantity of the sludge is 80-100%, the MLSS value of the adjustable combined tank is 4000-5000mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.1 to 1.
The low-temperature denitrification treatment system for sewage has the following beneficial effects:
(1) The system is provided with an adjustable combined tank, a movable baffle and an independently controlled aeration pipeline are arranged in the adjustable combined tank, the volume ratio of the aerobic tank to the anoxic tank can be flexibly adjusted to adapt to different inflow water quality and working environments, and the stability of a water body in the reaction tank is ensured. In addition, the movable baffle is provided with a guide driving mechanism, and the baffle can accurately move forwards and backwards by controlling the forward rotation or the reverse rotation of the motor. The size of the anoxic zone and the aerobic zone can be adjusted, so that different anaerobic zones can be adjusted according to the change of the water quality of inlet water, equipment has different operation conditions, and the stable standard of the water quality of outlet water is ensured.
(2) According to the system, the biological rotating disc is arranged in the anaerobic-anoxic zone, the nitrification liquid and the sludge can flow back to the front end of the biological rotating disc zone through the inner return pipeline and the sludge return pipeline, an external carbon source is not needed, and the utilization rate of a raw water carbon source is improved. In addition, the biological rotating disk is immersed in water by about 40 percent, so that the biofilm formation of the biological rotating disk is alternatively formed in water and air to form an aerobic area and an anoxic area above and below the water, and simultaneously, the environments of the aerobic area and the anoxic area outside the inner film of the biological film are formed, and two-stage AO above and below the water and the inner film of the biological film are formed. Meanwhile, the biological rotating disc area is provided with a sliding cover, so that heat can be preserved, and heat loss in the system in winter can be prevented.
(3) The system adopts new control steps and a new method, can solve the problems of low denitrification efficiency and unstable effluent quality of the existing equipment in a low-temperature environment, and can achieve 75-85% of the removal efficiency of the total nitrogen in the sewage, which is at least 30% higher than that of the traditional equipment.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall external structure of the present invention;
FIG. 2 is a schematic view of the overall internal structure of the present invention;
FIG. 3 is a schematic view of the return line configuration of the present invention;
FIG. 4 is a schematic view of the layout of the aeration pipeline and the base plate of the present invention;
FIG. 5 is a schematic structural view of a bio-disc according to the present invention;
FIG. 6 is a schematic view of the moving barrier structure of the present invention;
fig. 7 is a schematic view of the guiding driving mechanism of the present invention.
Wherein, 1-anoxic tank, 101-sliding cover, 102-impeller, 2-adjustable combined tank, 201-adjustable anoxic tank, 202-adjustable aerobic tank, 203-aeration pipeline, 204-bottom plate, 205-top plate, 206-sliding plate, 2031-first area pipeline, 2032-second area pipeline, 2033-third area pipeline, 2041-water outlet, 2042-first bottom plate, 2043-second bottom plate, 2044-third bottom plate, 3-MBR membrane tank, 301-MBR membrane module, 302-water flowing pipe, 4-biological rotating disk, 401-installation beam, 402-bearing seat, 403-rotating shaft, 404-rotating disk, 405-rotating disk motor, 406-central seat, 407-sector frame, 408-sector biological sheet, 5-movable baffle, 501-bottom sealing strip, 502-side sealing strip, 503-movable beam, 504-sliding block, 505-sliding rail, 6-guiding driving mechanism, 601-rack gear, 602-movable gear, 603-transmission shaft, 605-604-driving motor, 7-inner driving motor, 701-inner return pipeline, 802-8-sludge return pipe, 802-return pump, and 801 return sludge return pipe.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The present invention will be described in detail below with reference to the accompanying drawings.
Example one
As shown in fig. 1 to 7, a sewage low-temperature denitrification treatment system comprises an anoxic tank 1, an adjustable combined tank 2, an MBR membrane tank 3, a biological rotating disk 4, a movable baffle 5, a guide driving mechanism 6, an internal return pipeline 7 and a sludge return pipeline 8, in the figure, the anoxic tank 1 is integrally communicated with one end of the adjustable combined tank 2, the communication position is free of a baffle, a baffle is arranged between the other end of the adjustable combined tank 2 and the MBR membrane tank 3, the bottom of the baffle is provided with the communication pipeline, specifically, the top of the anoxic tank 1 is provided with a sliding cover 101, the inside of the anoxic tank 1 is provided with a flow impeller 102, the flow impeller mainly ensures that the active sludge in the anoxic zone is uniformly mixed, prevents sludge precipitation, and plays a role in stirring. The MBR membrane tank 3 is internally provided with an MBR membrane module 301, the MBR membrane module 301 adopts the existing equipment, the MBR membrane tank 3 is communicated with the adjustable combined tank 2 through a water flowing pipe 302 at the bottom, solid organic matters are refluxed into the reactor through the membrane module, and then the treated water is discharged.
In the figure, the biological rotating disk 4 is arranged inside the anoxic pond 1, and the biological rotating disk 4 can adopt the existing equipment, such as: foam bio-discs, optical disc bio-discs or fibre bio-discs, etc. The top of the adjustable combined tank 2 and the MBR membrane tank 3 is provided with a top plate 205 and a sliding plate 206, in addition, the biological rotating disk area is designed with a sliding cover, the totally closed structure can effectively preserve heat, and the heat dissipation in the system in winter is prevented.
In the figure, the movable baffle 5 is arranged inside the adjustable combined tank 2, the inner space of the adjustable combined tank 2 is divided into an adjustable anoxic tank 201 and an adjustable aerobic tank 202, aeration pipelines 203 are uniformly arranged at the bottom of the adjustable combined tank 2, the aeration pipelines 203 at the bottom of the adjustable anoxic tank 201 do not work, a plurality of bottom plates 204 are arranged among the aeration pipelines 203, the top of each bottom plate 204 can be matched and sealed with the bottom of the movable baffle 5, the inner space of the adjustable combined tank 2 is divided, a water outlet 2041 is formed in one side of each bottom plate 204, and the water outlet 2041 is used for guiding the circulation of sewage at the bottom of the tank body.
Specifically, the guiding driving mechanism 6 is used for driving the movable baffle 5 to move so as to adjust the ratio of the adjustable anoxic tank 201 to the adjustable aerobic tank 202, the internal return pipeline 7 comprises an internal return pump 701 and an internal return pipe 702, the internal return pump 701 is arranged at the bottom of the adjustable aerobic tank 202, one end of the internal return pipe 702 is communicated with the internal return pump 701, the other end of the internal return pipe 702 sequentially penetrates through the adjustable aerobic tank 202 and the adjustable anoxic tank 201 and then is arranged in the anoxic tank 1, the internal return pump is also called a nitrifying liquid return pump and returns nitrifying liquid to an anoxic zone, a large amount of nitrate returns to the anoxic zone, denitrifying bacteria take oxygen of nitrate in the return liquid as an electron acceptor, organic matters in raw water as a carbon source and reduce nitrate nitrogen into nitrogen. The sludge return pipeline 8 comprises a sludge return pump 801 and a sludge return pipe 802, the sludge return pump 801 is arranged at the bottom of the MBR membrane tank 3, one end of the sludge return pipe 802 is communicated with the sludge return pump 801, the other end of the sludge return pump 801 sequentially penetrates through the MBR membrane tank 3, the adjustable aerobic tank 202 and the adjustable anoxic tank 201 and then is arranged in the anoxic tank 1, and the sludge return pump 801 returns sludge to an anoxic zone to enable the biochemical system to maintain a certain sludge concentration.
In actual work, the anoxic tank 1 is communicated with a water inlet pipe, the MBR membrane module 301 is communicated with a water outlet pipe, taking fig. 3 as an example, the flowing of the entering sewage from left to right is completed through a water outlet 2041 between the movable baffle 5 and the bottom plate 204, the returning of the nitrified liquid from right to left is completed through an inner return pipeline 7, the returning of the sludge returning from right to left is completed through a sludge return pipeline 8, the system combines an anaerobic zone and an anoxic zone of the existing rural integrated equipment, a biological rotating disc is installed in the anaerobic zone, the anaerobic zone of the traditional activated sludge method is replaced by the biological rotating disc zone, the nitrified liquid and the sludge are returned to the front end of the biological rotating disc zone, after a large amount of nitrate in the returning liquid returns to the front end, denitrifying bacteria take oxygen in the returning liquid as an electron acceptor, organic matter in the raw water as a carbon source, nitrate nitrogen is reduced into nitrogen, and the utilization rate of the raw water carbon source is improved without adding an additional carbon source.
Example two
As shown in fig. 3 and 4, the aeration line 203 is divided into a first area conduit 2031, a second area conduit 2032, and a third area conduit 2033, which are independently controlled, and the base plate is divided into a first base plate 2042, a second base plate 2043, and a third base plate 2044, wherein: the first area conduit 2031 is disposed between the first base plate 2042 and the second base plate 2043; the second area conduit 2032 is disposed between the second base plate 2043 and the third base plate 2044; the third area conduit 2033 is disposed between the third bottom plate 2044 and the inner wall of the other end of the adjustable combination tank 2.
Specifically, the work area can be flexibly adjusted according to the position of the baffle plate by the aeration pipeline, the aeration pipeline in the aerobic tank normally works, the aeration pipeline in the anoxic tank stops working, and the pipeline in each area is provided with an electromagnetic valve or a manual ball valve.
In this embodiment, when the movable baffle 5 is moved to the position of the first bottom plate 2042, the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.6 to 1; when the movable baffle 5 moves to the position of the second bottom plate 2043, the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.2 to 1; when the movable baffle 5 moves to the position of the third bottom plate 2044, the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.1 to 1. During actual work, different working conditions are adjusted according to different water inlet qualities, and unstable water inlet qualities and sudden water inlet quality conditions are dealt with.
EXAMPLE III
In fig. 5, the bio-disc 1 includes a mounting beam 401, a bearing housing 402, a rotation shaft 403, a disc 404, and a disc motor 405, wherein: the mounting beam 401 is used as a bearing part and is arranged in the anoxic pond 1; bearing blocks 402 are provided on the mounting beams 401; both ends of the rotating shaft 403 are installed in the bearing block 402; a plurality of turntables 404 are sequentially sleeved on the rotating shaft 403; a motor 405 is provided at one side of the mounting beam 401, and the turntable motor 405 drives the rotation shaft 403 to rotate through a reducer and a coupling. In this embodiment, the turntable 404 is composed of a central base 406 and a plurality of fan-shaped frames 407 disposed around the central base 406, the fan-shaped frames 407 are filled with fan-shaped bio-sheets 408, wherein the fan-shaped bio-sheets 408 are made of existing fiber materials, such as: the structure of the fan-shaped biological piece 408 has the advantages of uniform density distribution, high porosity and large specific surface area.
It should be noted that the biological rotating disk 1 can complete the replacement and maintenance of the fiber sheet without detaching the rotating shaft and the rotating disk. In practice, the disc immersion rate is 30-40%.
During actual work, the biological rotating disc is installed in the anaerobic condition and is added, so that on one hand, the microbial biomass of the system can be improved, the concentration of low-temperature weak strain nitrifying bacteria can be improved, and the nitrification is further promoted; on the other hand, the inside of the biological membrane attached to the surface of the rotating disc is in an anaerobic or anoxic state, and denitrification can be performed, so that the aim of enhancing biological denitrification at low temperature is fulfilled. After the biofilm formation of the biological rotating disk is successful, the microbial biomass on the biological rotating disk is in a rangeThe circumference is 10g VSS/m 3 -30g VSS/m 3 The biochemical system increases a large amount of microorganisms, the concentration of the low-temperature weak strain nitrobacteria is relatively increased, and the treatment effect of the whole biochemical system is improved.
Example four
As shown in fig. 6 and 7, a bottom sealing strip 501 is disposed at the bottom of a plate body of the movable baffle 5, side sealing strips 502 are disposed at two sides of the plate body, the bottom sealing strip 501 is used for sealing the top of the bottom plate 204, the side sealing strips 502 are used for sealing the inner wall of the tank body, the top of the movable baffle 5 is fixedly connected with a movable beam 503, two ends of the movable beam 503 are provided with sliding blocks 504, the sliding blocks 504 are movably sleeved on sliding rails 505, and the sliding rails 505 are disposed at two sides of the top of the adjustable combined tank 2. In the figure, the guide driving mechanism 6 may be of a conventional structure, or may be of the following structure: the guiding driving mechanism 6 comprises a rack 601, a moving gear 602, a transmission shaft 603, a transmission gear set 604 and a guiding motor 605, wherein: two racks 601 are arranged on two sides of the top of the adjustable combined pool 2; the moving gear 602 is engaged on the rack 601; the movable gears 602 at the two ends are sleeved at the tail ends of the two sides of the transmission shaft 603, and the middle part of the transmission shaft 603 is connected with the guide motor 605 through the transmission gear set 604; drive gear set 604 comprises a worm gear, bevel gear set, or bevel gear set.
In this embodiment, the movable baffle is provided with a guide driving mechanism, and the baffle can be accurately moved back and forth by controlling the forward rotation or the reverse rotation of the motor.
EXAMPLE five
A sewage low-temperature denitrification treatment system comprises the following control steps:
step 1), controlling the water inlet temperature of sewage of a system to be 8-12 ℃;
step 2) detecting the quality of sewage inflow water of the system in real time, wherein detection indexes comprise a COD (chemical oxygen demand) value, an ammonia nitrogen value and a total nitrogen value;
and 3) controlling the water inflow of the sewage, the rotating speed of the biological rotating disc, the dissolved oxygen amount of the anoxic tank, the dissolved oxygen amount of the aerobic zone, the reflux amount of the nitrifying liquid, the reflux amount of the sludge, the MLSS value of the adjustable combined tank and the proportion of the adjustable anoxic tank and the adjustable aerobic tank based on the detection indexes.
Specifically, the steps further include the following specific control method:
method 1) controlling the water inflow of the sewage to be 8-8.5m when the water inflow temperature of the sewage is 10-12 ℃, the COD value is 200-300mg/L, the ammonia nitrogen value is 30-40mg/L and the total nitrogen value is 40-50mg/L 3 H, the rotating speed of the biological rotating disc is 6-8r/min, the dissolved oxygen content of the anoxic tank is 2-3mg/L, the dissolved oxygen content of the aerobic zone is 2-4mg/L, the reflux amount of the nitrifying liquid is 200-250%, the reflux amount of the sludge is 50-100%, the MLSS value of the adjustable combined tank is 2500-3000mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:3.5 to 1;
method 2) when the water inlet temperature of the sewage is 10-12 ℃, the COD value is 250-300mg/L, the ammonia nitrogen value is 35-45mg/L and the total nitrogen value is 50-60mg/L, controlling the water inflow of the sewage to be 8-8.5m 3 H, the rotating speed of the biological rotating disc is 7-8r/min, the dissolved oxygen content of the anoxic tank is 2-2.5mg/L, the dissolved oxygen content of the aerobic zone is 2-4mg/L, the return flow of the nitrifying liquid is 250-300%, the return flow of the sludge is 70-100%, the MLSS value of the adjustable combined tank is 3000-3500mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.6 to 1;
method 3) controlling the water inflow of the sewage to be 8-8.5m when the water inflow temperature of the sewage is 8-12 ℃, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L and the total nitrogen value is 55-70mg/L 3 The rotating speed of the biological rotating disc is 8-9r/min, the dissolved oxygen content of the anoxic tank is 1.5-2mg/L, the dissolved oxygen content of the aerobic zone is 3-4mg/L, the reflux quantity of the nitrifying liquid is 300-350%, the reflux quantity of the sludge is 80-100%, the MLSS value of the adjustable combined tank is 3500-4000mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.2 to 1;
method 4) controlling the water inflow of the sewage to be 8-8.5m when the water inflow temperature of the sewage is 8-10 ℃, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L and the total nitrogen value is 55-70mg/L 3 H, the rotating speed of the biological rotating disc is 8-9r/min, the dissolved oxygen content of the anoxic tank is 1.5-2mg/L, the dissolved oxygen content of the aerobic zone is 3-4mg/L, the reflux quantity of the nitrifying liquid is 300-350%, the reflux quantity of the sludge is 80-100%, the MLSS value of the adjustable combined tank is 4000-5000mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.1 to 1.
It should be noted that, when the temperature of the inlet water is 12 ℃, the inlet water can reach the standard according to the above instructions, and then in the system which stably reaches the standard, the microorganism population structure in the biofilm in the period is further analyzed, extracted and cultured by adopting the clone library technology in the microorganisms of the rotating biological disk biofilm. Under the conditions of lower temperature and worse water quality of inlet water, the extracted low-temperature microbial strains are added, and the sewage treatment efficiency is further improved.
In actual work, if the total nitrogen content in the inlet water is high, under the condition of ensuring enough retention time of an aerobic zone, the aeration head of the adjustable area is closed when nitrogen removal needs to be enhanced, meanwhile, the adjustable baffle plate moves towards the second bottom plate or the third bottom plate to adjust the aeration head into an anoxic environment, additional denitrification effect is provided, nitrate produced by the aerobic section is used as an electron acceptor, endogenous organic carbon is used as an electron donor, and the nitrogen removal effect is enhanced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a sewage low temperature denitrification processing system, its characterized in that, includes oxygen deficiency pond (1), adjustable combination pond (2), MBR membrane cisterna (3), biological rotating disk (4), movable baffle (5), direction actuating mechanism (6), interior return line (7) and mud return line (8), wherein:
the anoxic tank (1) is integrally communicated with one end of the adjustable combined tank (2), and the other end of the adjustable combined tank (2) is communicated with the bottom of the MBR membrane tank (3) through a pipeline;
the biological rotating disc (4) is arranged inside the anoxic tank (1);
the movable baffle (5) is arranged in the adjustable combined tank (2) and divides the inner space of the adjustable combined tank (2) into an adjustable anoxic tank (201) and an adjustable aerobic tank (202), aeration pipelines (203) are uniformly arranged at the bottom of the adjustable combined tank (2), a plurality of bottom plates (204) are arranged among the aeration pipelines (203), the tops of the bottom plates (204) can be matched and sealed with the bottom of the movable baffle (5), and a water outlet (2041) is arranged on one side of each bottom plate (204);
the guide driving mechanism (6) is used for driving the movable baffle (5) to move so as to adjust the proportion of the adjustable anoxic tank (201) to the adjustable aerobic tank (202);
the internal reflux pipeline (7) comprises an internal reflux pump (701) and an internal reflux pipe (702), the internal reflux pump (701) is arranged at the bottom of the adjustable aerobic pool (202), one end of the internal reflux pipe (702) is communicated with the internal reflux pump (701), and the other end of the internal reflux pipe (702) sequentially penetrates through the adjustable aerobic pool (202) and the adjustable anoxic pool (201) and then is arranged in the anoxic pool (1);
the sludge return pipeline (8) comprises a sludge return pump (801) and a sludge return pipe (802), the sludge return pump (801) is arranged at the bottom of the MBR membrane pool (3), one end of the sludge return pipe (802) is communicated with the sludge return pump (801), and the other end of the sludge return pump (801) sequentially penetrates through the MBR membrane pool (3), the adjustable aerobic pool (202) and the adjustable anoxic pool (201) and then is arranged in the anoxic pool (1).
2. The sewage low-temperature denitrification treatment system according to claim 1, wherein the anoxic tank (1) is communicated with a water inlet pipe, a sliding cover (101) is arranged at the top of the anoxic tank (1), and a flow impeller (102) is arranged inside the anoxic tank (1).
3. The sewage low-temperature denitrification treatment system according to claim 1, wherein the top of the adjustable combined tank (2) and the MBR membrane tank (3) is provided with a top plate (205) and a sliding plate (206).
4. The low temperature denitrification processing system for wastewater according to claim 1, wherein the aeration line (203) is divided into a first zone conduit (2031), a second zone conduit (2032) and a third zone conduit (2033) which are independently controlled, the bottom plate is divided into a first bottom plate (2042), a second bottom plate (2043) and a third bottom plate (2044), wherein:
the first zone conduit (2031) is arranged between the first floor (2042) and the second floor (2043); the second zone conduit (2032) is arranged between the second floor (2043) and the third floor (2044); the third area pipeline (2033) is arranged between the third bottom plate (2044) and the inner wall of the other end of the adjustable combined tank (2).
5. The sewage low-temperature denitrification treatment system according to claim 1, wherein an MBR (membrane bioreactor) membrane module (301) is arranged inside the MBR membrane tank (3), and the MBR membrane module (301) is communicated with a drain pipe; the MBR membrane tank (3) is communicated with the adjustable combined tank (2) through a water flowing pipe (302) at the bottom.
6. The sewage low-temperature denitrification processing system according to claim 1, wherein the biological rotating disk (1) comprises a mounting beam (401), a bearing seat (402), a rotating shaft (403), a rotating disk (404) and a rotating disk motor (405), wherein:
the mounting beam (401) is used as a bearing part and is arranged in the anoxic pond (1); the bearing block (402) is arranged on the mounting beam (401); two ends of the rotating shaft (403) are arranged in the bearing block (402); the plurality of turnplates (404) are sequentially sleeved on the rotating shaft (403); the motor (405) is arranged on one side of the mounting beam (401), and the turntable motor (405) drives the rotating shaft (403) to rotate through the speed reducer and the coupling;
the turntable (404) is composed of a central seat (406) and a plurality of fan-shaped frames (407) arranged around the central seat (406), and the fan-shaped frames (407) are filled with fan-shaped biological pieces (408).
7. The sewage low-temperature denitrification treatment system according to claim 1, wherein the bottom of the plate body of the movable baffle (5) is provided with a bottom sealing strip (501), the two sides of the plate body are provided with side sealing strips (502), the top of the movable baffle (5) is fixedly connected with a movable beam (503), the two ends of the movable beam (503) are provided with sliding blocks (504), the sliding blocks (504) are movably sleeved on sliding rails (505), and the sliding rails (505) are arranged on the two sides of the top of the adjustable combined tank (2).
8. The low-temperature denitrification treatment system for sewage according to claim 1, wherein the guiding driving mechanism (6) comprises a rack (601), a moving gear (602), a transmission shaft (603), a transmission gear set (604) and a guiding motor (605), wherein:
the two racks (601) are arranged on two sides of the top of the adjustable combined pool (2);
the moving gear (602) is engaged on the rack (601);
the movable gears (602) at the two ends are sleeved at the tail ends of the two sides of the transmission shaft (603), and the middle part of the transmission shaft (603) is connected with the guide motor (605) through a transmission gear set (604);
the transmission gear set (604) comprises a worm gear, a bevel gear set or a bevel gear set.
9. The low-temperature denitrification treatment system for sewage according to claim 1, comprising the following control steps:
step 1), controlling the water inlet temperature of a system to be 8-12 ℃;
step 2) detecting the quality of sewage inflow water of the system in real time, wherein detection indexes comprise a COD (chemical oxygen demand) value, an ammonia nitrogen value and a total nitrogen value;
and 3) controlling the water inflow of the sewage, the rotating speed of the biological rotating disc, the dissolved oxygen content of the anoxic tank, the dissolved oxygen content of the aerobic zone, the reflux amount of the nitrifying liquid, the reflux amount of the sludge, the MLSS value of the adjustable combined tank and the proportion of the adjustable anoxic tank and the adjustable aerobic tank based on the detection indexes.
10. The low-temperature denitrification treatment system for sewage according to claim 9, comprising the following control method:
method 1) controlling the water inflow of the sewage to be 8-8.5m when the water inflow temperature of the sewage is 10-12 ℃, the COD value is 200-300mg/L, the ammonia nitrogen value is 30-40mg/L and the total nitrogen value is 40-50mg/L 3 The rotating speed of the biological rotating disc is 6-8r/min, the dissolved oxygen content of the anoxic tank is 2-3mg/L, the dissolved oxygen content of the aerobic zone is 2-4mg/L, the reflux amount of the nitrifying liquid is 200-250%, the reflux amount of the sludge is 50-100%, the MLSS value of the adjustable combined tank is 2500-3000mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:3.5 to 1;
method 2) controlling the water inflow of the sewage to be 8-8.5m when the water inflow temperature of the sewage is 10-12 ℃, the COD value is 250-300mg/L, the ammonia nitrogen value is 35-45mg/L and the total nitrogen value is 50-60mg/L 3 H, the rotating speed of the biological rotating disc is 7-8r/min, the dissolved oxygen content of the anoxic tank is 2-2.5mg/L, the dissolved oxygen content of the aerobic zone is 2-4mg/L, the reflux quantity of the nitrifying liquid is 250-300%, the reflux quantity of the sludge is 70-100%, the MLSS value of the adjustable combined tank is 3000-3500mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.6 to 1;
method 3) controlling the water inflow of the sewage to be 8-8.5m when the water inflow temperature of the sewage is 8-12 ℃, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L and the total nitrogen value is 55-70mg/L 3 The rotating speed of the biological rotating disc is 8-9r/min, the dissolved oxygen content of the anoxic tank is 1.5-2mg/L, the dissolved oxygen content of the aerobic zone is 3-4mg/L, the reflux quantity of the nitrifying liquid is 300-350%, the reflux quantity of the sludge is 80-100%, the MLSS value of the adjustable combined tank is 3500-4000mg/L, and the proportion of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.2 to 1;
method 4) when the water inlet temperature of the sewage is 8-10 ℃, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L and the total nitrogen value is 55-70mg/L, controlling the water inflow of the sewage to be 8-8.5m 3 H, the rotating speed of the biological rotating disc is 8-9r/min, the dissolved oxygen content of the anoxic tank is 1.5-2mg/L, the dissolved oxygen content of the aerobic zone is 3-4mg/L, the reflux amount of the nitrifying liquid is 300-350%, the reflux amount of the sludge is 80-100%, the MLSS value of the adjustable combined tank is 4000-5000mg/L, and the MLSS value of the adjustable combined tank can be adjusted to be within the range ofThe proportion of the oxygen-deficient regulating tank to the aerobic regulating tank is 1:1.1 to 1.
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