CN115536152A - Sewage low temperature denitrification processing system - Google Patents

Abstract

The invention discloses a low-temperature denitrification treatment system for sewage, which belongs to the technical field of sewage treatment. Inside the anoxic pool, the movable baffle divides the internal space of the adjustable combined pool into an adjustable anoxic pool and an adjustable aerobic pool, and the guide drive mechanism is used to drive the mobile baffle to move to adjust the adjustable anoxic pool And the ratio of the aerobic pool can be adjusted, the internal return flow from the end of the aerobic pool to the anoxic pool, and the sludge return flow from the MBR membrane pool to the anoxic pool. Compared with the existing technology, this scheme combines the anaerobic zone and the anoxic zone of the existing equipment, and installs a biological turntable in the anaerobic zone. The return flow of nitrifying liquid and sludge can return to the front of the biological turntable area without additional Carbon source improves the utilization rate of raw water carbon source. Under low temperature environment, the removal efficiency of total nitrogen in sewage can reach 75%-85%, which is at least 30% higher than that of traditional equipment.

Description

A sewage low temperature denitrification treatment system

technical field

The invention belongs to the technical field of sewage treatment, in particular to a low-temperature denitrification treatment system for sewage.

Background technique

With the rapid development of my country's economy and the acceleration of urbanization, the living standards of rural residents have been greatly improved. Rural water supply continues to develop, and due to the popularization of sanitary facilities such as showers, washing machines, and flushing toilets, domestic drainage in rural areas continues to increase. The problem of domestic sewage pollution in rural areas has become a problem that cannot be ignored and needs to be solved urgently.

Integrated sewage treatment equipment has a series of advantages such as low investment, low energy consumption, high treatment efficiency, small footprint, and convenient management, and has been promoted in rural areas. With the further improvement of the control of total nitrogen and ammonia nitrogen in the discharge standard of rural sewage, the requirements for the denitrification of integrated equipment are getting higher and higher.

At present, the main process of sewage treatment is still biological treatment, and the denitrification of low-temperature sewage treatment is a major challenge for the sewage treatment industry. In addition, the current integrated sewage treatment equipment will have problems such as low nitrogen removal efficiency and unstable effluent quality under low temperature conditions in winter. These problems seriously affect the compliance rate of sewage treatment. When the temperature is low in winter, especially when the temperature is lower than 12°C, the denitrification efficiency of the biochemical system will drop significantly. The main reason is that the low temperature environment is very unfavorable to the growth and metabolism of microorganisms and the removal of pollutants in water. Low temperature will lead to changes in the structure of microbial communities, a decrease in growth rate, and deterioration of physiological characteristics, etc., while filamentous bacteria are more active. These changes directly affect the overall environment. The water quality of the effluent from the chemical equipment made the effluent ammonia nitrogen and total nitrogen not up to the standard.

In view of the above reasons, the present invention studies the method of high-efficiency denitrification under low temperature conditions, and proposes a method for strengthening low-temperature denitrification of rural integrated sewage treatment equipment, which is conducive to improving the quality of effluent water from the integrated equipment, and has important environmental value.

Contents of the invention

In view of the above technical problems, the present invention provides a low-temperature denitrification treatment system for sewage. This scheme combines the anaerobic zone and anoxic zone of the existing equipment, and installs a biological turntable in the anaerobic zone, nitrifying liquid and sludge It can flow back to the front end of the biological turntable area without additional carbon source, which improves the utilization rate of raw water carbon source. Under low temperature environment, the removal efficiency of total nitrogen in sewage can reach 75%-85%, which is at least as high as that of traditional equipment Increased by 30%.

The present invention solves the above problems by the following technical means:

A sewage low-temperature denitrification treatment system, characterized in that it includes an anoxic tank, an adjustable combination tank, an MBR membrane tank, a biological turntable, a movable baffle, a guiding drive mechanism, an internal return pipeline and a sludge return pipeline, wherein : the anoxic pool is integrally communicated with one end of the adjustable combined pool, and the other end of the adjustable combined pool is communicated with the bottom of the MBR membrane pool through pipelines; the biological turntable is arranged inside the anoxic pool; the mobile baffle It is installed inside the adjustable combined pool and divides the internal space of the adjustable combined pool into an adjustable anoxic pool and an adjustable aerobic pool. The bottom of the adjustable combined pool is evenly arranged with aeration pipelines. A plurality of bottom plates are arranged between them, the top of the bottom plate can be sealed with the bottom of the movable baffle, and a water outlet is provided on one side of the bottom plate; The ratio of the tank and the adjustable aerobic pool; the internal return pipeline includes an internal return pump and an internal return pipe, the internal return pump is arranged at the bottom of the adjustable aerobic pool, and one end of the internal return pipe communicates with the internal return pump. The other end of the internal return pipe passes through the adjustable aerobic tank and the adjustable anoxic tank in turn and is set in the anoxic tank; the sludge return pipeline includes a sludge return pump and a sludge return pipe, and the sludge return The pump is set at the bottom of the MBR membrane pool, one end of the sludge return pipe is connected to the sludge return pump, and the other end of the sludge return pump passes through the MBR membrane pool, the adjustable aerobic pool, and the adjustable anoxic pool in sequence, and then is set in the anoxic pool. in the oxygen pool.

Preferably, the anoxic pool is connected to the water inlet pipe, the top of the anoxic pool is provided with a sliding cover, and the interior of the anoxic pool is provided with a flow impeller.

Preferably, the top of the adjustable combination pool and the MBR membrane pool are provided with a top plate and a slide 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 The pipeline in the first area is arranged between the first bottom plate and the second bottom plate; the pipeline in the second area is arranged between the second bottom plate and the third bottom plate; the pipeline in the third area is arranged between the third bottom plate and the adjustable combination pool between the inner walls at the other end.

Preferably, the inside of the MBR membrane tank is provided with an MBR membrane module, and the MBR membrane module is connected to a drainage pipe; the MBR membrane tank and the adjustable combination tank are connected through a flow pipe at the bottom.

Preferably, the biological turntable includes a mounting beam, a bearing seat, a rotating shaft, a turntable and a turntable motor, wherein: the mounting beam is set as a load-bearing part in the anoxic tank; the bearing seat is arranged on the mounting beam; the rotating shaft The two ends are installed in the bearing housing; a plurality of the turntables are sequentially set on the rotating shaft; the motor is arranged on one side of the installation beam, and the turntable motor drives the rotating shaft to rotate through the reducer and the coupling; the turntable is composed of the center seat and It consists of a plurality of fan-shaped frames arranged around the central seat, and the inside of the fan-shaped frames is filled with fan-shaped biological sheets.

Preferably, the bottom of the plate body of the mobile 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 mobile baffle is fixedly connected with a moving beam, and the two ends of the moving beam are provided with sliders , the slide block is movably set on the slide rails, and the slide rails are arranged on both sides of the top of the adjustable combination pool.

Preferably, the guide drive mechanism includes a rack, a moving gear, a transmission shaft, a transmission gear set and a guide motor, wherein: two racks are arranged on both sides of the top of the adjustable combined pool; On the rack; the moving gears at both ends are set on both ends of the transmission shaft, and the middle part of the transmission shaft is connected with the guide motor through a transmission gear set; the transmission gear set includes a worm gear, a bevel gear set or a bevel gear set.

A low-temperature denitrification treatment system for sewage, comprising the following control steps:

Step 1) The temperature of the sewage entering the control system is 8-12°C;

Step 2) Real-time detection of the sewage influent water quality of the system, the detection indicators include COD value, ammonia nitrogen value and total nitrogen value;

Step 3) Based on the detection indicators, control the inflow of sewage, the rotational speed of the biological turntable, the dissolved oxygen in the anoxic tank, the dissolved oxygen in the aerobic zone, the return flow of nitrification liquid, the return flow of sludge, the MLSS value of the adjustable combination tank, and Adjustable anoxic pool and adjustable aerobic pool ratio.

A low-temperature denitrification treatment system for sewage, including the following control method:

Method 1) When the influent temperature of the sewage is 10-12°C, the COD value is 200-300mg/L, the ammonia nitrogen value is 30-40mg/L, and the total nitrogen value is 40-50mg/L, control the influent amount of sewage as 8-8.5m ³ /h, the rotational speed of the biological turntable is 6-8r/min, the dissolved oxygen in the anoxic pool is 2-3mg/L, the dissolved oxygen in the aerobic zone is 2-4mg/L, and the reflux of the nitrification solution is 200 -250%, the sludge return rate is 50-100%, the MLSS value of the adjustable combined tank is 2500-3000mg/L, and the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:3.5 to 1:3;

Method 2) When the sewage influent temperature is 10-12°C, the COD value is 250-300mg/L, the ammonia nitrogen value is 35-45mg/L, and the total nitrogen value is 50-60mg/L, control the sewage inflow as 8-8.5m ³ /h, the rotational speed of the biological turntable is 7-8r/min, the dissolved oxygen in the anoxic pool is 2-2.5mg/L, the dissolved oxygen in the aerobic zone is 2-4mg/L, and the reflux of the nitrification solution is 250-300%, the sludge return rate is 70-100%, the MLSS value of the adjustable combined pool is 3000-3500mg/L, and the ratio of the adjustable anoxic pool to the adjustable aerobic pool is 1:1.6 to 1:2;

Method 3) When the sewage influent temperature is 8-12°C, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L, and the total nitrogen value is 55-70mg/L, control the sewage inflow as 8-8.5m ³ /h, the rotational speed of the biological turntable is 8-9r/min, the dissolved oxygen in the anoxic pool is 1.5-2mg/L, the dissolved oxygen in the aerobic zone is 3-4mg/L, and the reflux of the nitrification solution is 300 -350%, the sludge return rate is 80-100%, the MLSS value of the adjustable combined tank is 3500-4000mg/L, and the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.2 to 1:5;

Method 4) When the sewage influent temperature is 8-10°C, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L, and the total nitrogen value is 55-70mg/L, control the sewage inflow as 8-8.5m ³ /h, the rotational speed of the biological turntable is 8-9r/min, the dissolved oxygen in the anoxic pool is 1.5-2mg/L, the dissolved oxygen in the aerobic zone is 3-4mg/L, and the reflux of the nitrification solution is 300 -350%, the sludge return rate is 80-100%, the MLSS value of the adjustable combination tank is 4000-5000mg/L, and the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.1 to 1:5.

A sewage low-temperature denitrification treatment system invented has the following beneficial effects:

(1) The system is equipped with an adjustable combination tank, which is equipped with a movable baffle and an independently controlled aeration pipe inside, which can flexibly adjust the volume ratio of the aerobic tank and the anoxic tank to adapt to different water inflows Water quality and working environment, to ensure the stability of the water in the reaction pool. In addition, the mobile baffle is equipped with a guide drive mechanism, which can realize the precise forward and backward movement of the baffle by controlling the forward or reverse rotation of the motor. The size of anoxic and aerobic zones can be adjusted to adjust different anaerobic and anoxic zones according to the change of influent water quality. The equipment will have different operating conditions to ensure that the effluent water quality is stable and up to standard.

(2) The system is equipped with a biological turntable in the anaerobic area, through the internal return pipeline and the sludge return pipeline, the nitrifying liquid and sludge can be returned to the front end of the biological turntable area, and no external carbon source is required, which improves the raw water carbon. source utilization. In addition, about 40% of the biological turntable is submerged in water, so that the biological turntable hangs membranes alternately in the water and in the air to form an aerobic zone and anoxic zone above and below the water. The two-stage AO above and below the water and the inside and outside of the membrane are formed in the environment of the zone and the anoxic zone. Due to the large load of the bio-film, the synchronous nitrification reaction can be completed in the two-stage AO of the biological turntable under a short residence time. Nitrification, the reaction is also similar to anaerobic ammonium oxidation, which strengthens the effect of low temperature denitrification. At the same time, the biological turntable area is designed with a sliding cover, which can keep warm and prevent heat loss in the system in winter.

(3) The system adopts new control steps and methods, which can solve the problems of low denitrification efficiency of existing equipment and unstable effluent quality under low temperature environment, and the removal efficiency of total nitrogen in sewage can reach 75%-85%. Compared with traditional equipment, the removal efficiency is at least 30% higher.

Description of drawings

In order to illustrate the technical solution of the present invention more clearly, the accompanying drawings used in the implementation will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. As far as the skilled person is concerned, other drawings can also be obtained based on these drawings on the premise of not paying creative work.

Fig. 1 is a schematic diagram of the overall external structure of the present invention;

Fig. 2 is a schematic diagram of the overall internal structure of the present invention;

Fig. 3 is a schematic diagram of the return pipeline structure of the present invention;

Fig. 4 is a schematic diagram of the layout of the aeration pipeline and the bottom plate of the present invention;

Fig. 5 is a schematic diagram of the structure of the biological turntable of the present invention;

Fig. 6 is a schematic structural view of the mobile baffle of the present invention;

Fig. 7 is a structural schematic diagram of the guide driving mechanism of the present invention.

Among them, 1-anoxic pool, 101-sliding cover, 102-flow booster, 2-adjustable combination pool, 201-adjustable anoxic pool, 202-adjustable aerobic pool, 203-aeration pipeline, 204 -Bottom plate, 205-Top plate, 206-Sliding plate, 2031-First area pipe, 2032-Second area pipe, 2033-Third area pipe, 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 pipe, 4-biological turntable, 401-installation beam, 402-bearing seat, 403-rotating shaft, 404-turntable, 405-turntable motor, 406-center seat, 407-fan-shaped frame, 408-fan-shaped biological sheet, 5-moving baffle, 501-bottom sealing strip, 502-side sealing strip, 503-moving beam, 504-slider, 505-sliding rail, 6 -guiding drive mechanism, 601-rack, 602-moving gear, 603-transmission shaft, 604-transmission gear set, 605-drive motor, 7-inner return pipeline, 701-inner return pump, 702-inner return pipe, 8-sludge return pipeline, 801-sludge return pump, 802-sludge return pipe.

detailed description

In describing the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

The present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment one

As shown in Figures 1 to 7, a sewage low-temperature denitrification treatment system includes an anoxic pool 1, an adjustable combination pool 2, an MBR membrane pool 3, a biological turntable 4, a mobile baffle 5, a guiding drive mechanism 6, and an internal backflow Pipeline 7 and sludge return pipeline 8. In the figure, one end of the anoxic pool 1 is connected to the adjustable combined pool 2 as a whole, and there is no baffle at the connection point. There is a baffle, and the bottom of the baffle is provided with a connecting pipeline. Specifically, the top of the anoxic pool 1 is provided with a slide cover 101, and the inside of the anoxic pool 1 is provided with a pusher 102. The pusher is mainly to ensure the anoxic The activated sludge in the area is evenly mixed to prevent sludge sedimentation and play a stirring role. The inside of the MBR membrane pool 3 is provided with an MBR membrane module 301. The MBR membrane module 301 adopts existing equipment. The MBR membrane pool 3 and the adjustable combination pool 2 are communicated through the flow pipe 302 at the bottom, and the solid organic matter is refluxed through the membrane module. to the reactor, and the treated water is discharged.

In the figure, the biological turntable 4 is set inside the anoxic tank 1, and the biological turntable 4 can adopt existing equipment, such as: a foam biological turntable, a CD biological turntable, or a fiber biological turntable. The top of the adjustable combination pool 2 and the MBR membrane pool 3 are provided with a top plate 205 and a slide plate 206. In addition, the biological turntable area is designed with a slide cover. The fully enclosed structure can effectively keep heat and prevent heat loss in the system in winter.

In the figure, the movable baffle 5 is arranged in the inside of the adjustable combined pool 2, and divides the internal space of the adjustable combined pool 2 into an adjustable anoxic pool 201 and an adjustable aerobic pool 202, and the bottom of the adjustable combined pool 2 The aeration pipelines 203 are evenly arranged, and the aeration pipelines 203 at the bottom of the adjustable anoxic tank 201 do not work, and a plurality of bottom plates 204 are arranged between the aeration pipelines 203, and the tops of the bottom plates 204 can be connected to the bottom of the movable baffle plate 5 Cooperate with the seal to realize the division of the internal space of the adjustable combination pool 2. One side of the bottom plate 204 is provided with a water outlet 2041, and the water outlet 2041 is used to guide the flow of sewage at the bottom of the pool body.

Specifically, the guide drive mechanism 6 is used to drive the movable baffle 5 to move to adjust the ratio of the adjustable anoxic pool 201 and the adjustable aerobic pool 202, and the inner return pipeline 7 includes an inner return pump 701 and an inner return pipe 702, The internal return pump 701 is set at the bottom of the adjustable aerobic pool 202, one end of the internal return pipe 702 is connected to the internal return pump 701, and the other end of the internal return pipe 702 passes through the adjustable aerobic pool 202 and the adjustable anoxic pool 201 in sequence Finally, it is installed in the anoxic pool 1. The internal return pump is also called the nitrification liquid return pump, which returns the nitrification liquid to the anoxic area, and a large amount of nitrate is returned to the anoxic area. The denitrifying bacteria use the oxygen of the nitrate in the return liquid as the The electron acceptor, the organic matter in the raw water is the carbon source, and the nitrate nitrogen is reduced to nitrogen gas. The sludge return pipeline 8 includes 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, and one end of the sludge return pipe 802 is connected to the sludge return pump 801, and the sludge return The other end of the pump 801 passes through the MBR membrane pool 3, the adjustable aerobic pool 202, and the adjustable anoxic pool 201 in turn, and then is set in the anoxic pool 1, and the sludge return pump 801 returns the sludge to the anoxic area, so that The biochemical system maintains a certain sludge concentration.

In actual operation, the anoxic tank 1 is connected to the water inlet pipe, and the MBR membrane module 301 is connected to the drain pipe. Taking Fig. 3 as an example, the flow of the incoming sewage from left to right is through the water outlet 2041 between the movable baffle plate 5 and the bottom plate 204 Completed, the reflux of nitrifying liquid from right to left is completed through the internal return pipeline 7, and the return of sludge return from right to left is completed through the sludge return pipeline 8. This system integrates the existing rural integrated equipment The anaerobic zone and the anoxic zone are merged, and a biological turntable is installed in the anaerobic zone, and the anaerobic zone of the traditional activated sludge method is replaced by the biological turntable zone, and the nitrifying liquid and sludge are returned to the front end of the biological turntable zone, and the backflow After a large amount of nitrate in the liquid returns to the front end, the denitrifying bacteria use the oxygen in the reflux liquid as the electron acceptor, and the organic matter in the raw water as the carbon source, and reduce the nitrate nitrogen to nitrogen gas without additional carbon source, which improves the raw water carbon. source utilization.

Embodiment two

As shown in Figure 3 and Figure 4, the aeration pipeline 203 is divided into a first area pipeline 2031, a second area pipeline 2032 and a third area pipeline 2033 which are independently controlled, and the bottom plate is divided into a first bottom plate 2042, a second bottom plate 2043 and a first bottom plate 2043. The third bottom plate 2044, wherein: the first area pipeline 2031 is arranged between the first bottom plate 2042 and the second bottom plate 2043; the second area pipeline 2032 is arranged between the second bottom plate 2043 and the third bottom plate 2044; the third area pipeline 2033 It is arranged between the third bottom plate 2044 and the inner wall at the other end of the adjustable combination pool 2 .

Specifically, the aeration pipeline can flexibly adjust the working area according to the position of the baffle. The aeration pipeline in the aerobic tank works normally, and the aeration pipeline in the anoxic tank stops working. The pipeline in each area is equipped with a solenoid valve or Manual ball valve.

In this embodiment, when the movable baffle 5 moves to the position of the first bottom plate 2042, the ratio of the adjustable anoxic pool to the adjustable aerobic pool is 1:1.6 to 1:2; When the position of the second bottom plate 2043, the ratio of the adjustable anoxic pool and the adjustable aerobic pool is 1:1.2 to 1:5; The ratio of adjustable aerobic pool is 1:1.1 to 1:5. In actual work, according to different influent water quality, adjust different working conditions to deal with unstable influent water quality and sudden influent water quality.

Embodiment three

In Fig. 5, biological turntable 1 comprises installation beam 401, bearing seat 402, rotating shaft 403, turntable 404 and turntable motor 405, wherein: installation beam 401 is arranged in anoxic pool 1 as load bearing; Bearing seat 402 is arranged on installation beam 401 above; both ends of the rotating shaft 403 are installed in the bearing housing 402; multiple turntables 404 are sequentially set on the rotating shaft 403; the motor 405 is arranged on one side of the installation beam 401, and the turntable motor 405 drives the rotating shaft 403 to rotate through a reducer and a coupling . In this embodiment, the turntable 404 is composed of a central seat 406 and a plurality of fan-shaped frames 407 arranged around the center seat 406. The inside of the fan-shaped frame 407 is filled with fan-shaped bio-chips 408, wherein the fan-shaped bio-chips 408 use existing fiber materials, such as : polyvinylidene chloride material, geotextile fiber material, etc., the fan-shaped biosheet 408 structure has the advantages of uniform density distribution, high porosity, and large specific surface area.

It should be noted that the biological turntable 1 can complete the replacement and maintenance of the fiber sheets without disassembling the rotating shaft and the turntable. In actual work, the immersion rate of the disc is 30-40%.

In actual work, by installing a biological turntable in the anaerobic environment, the addition of the biological turntable can increase the microbial biomass of the system on the one hand, increase the concentration of low-temperature weak bacteria and nitrifying bacteria, and promote nitrification; on the other hand, attaching to the The interior of the biofilm on the surface of the turntable is in an anaerobic or anoxic state, which can carry out denitrification, thus achieving the purpose of strengthening biological denitrification at low temperatures. After the successful film coating on the biological turntable, the microbial mass on the biological turntable ranges from 10g VSS/m ³ to 30gVSS/m ³ , a large number of microorganisms have been added to the biochemical system, and the concentration of low-temperature vulnerable species of nitrifying bacteria will also increase relatively, improving the overall Effects of treatment on biochemical systems.

Embodiment four

As shown in Figure 6 and Figure 7, the bottom of the plate body of the movable baffle 5 is provided with a bottom sealing strip 501, and the two sides of the plate body are provided with side sealing strips 502, and the bottom sealing strip 501 is used to cooperate with the top sealing of the bottom plate 204, The side sealing strip 502 is used for sealing the inner wall of the pool. 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 sliders 504. The sliders 504 are movably set on the slide rails 505. The slide rails 505 are arranged on both sides of the top of the adjustable combination pool 2 . Among the figure, the guide drive mechanism 6 can adopt the existing structure, and can also adopt the following structure: the guide drive mechanism 6 includes a rack 601, a moving gear 602, a transmission shaft 603, a transmission gear set 604 and a guide motor 605, wherein: two teeth The bar 601 is arranged on both sides of the top of the adjustable combination pool 2; the moving gear 602 is meshed on the rack 601; the moving gear 602 at both ends is set on the ends of both sides of the transmission shaft 603, and the middle part of the transmission shaft 603 is connected with the transmission gear set 604. The guide motor 605 is connected; the transmission gear set 604 includes a worm gear, a bevel gear set or a bevel gear set.

In this embodiment, the movable baffle is equipped with a guide drive mechanism, which can realize precise forward and backward movement of the baffle by controlling the forward rotation or reverse rotation of the motor.

Embodiment five

A low-temperature denitrification treatment system for sewage, comprising the following control steps:

Step 1) The temperature of the sewage entering the control system is 8-12°C;

Step 2) Real-time detection of the sewage influent water quality of the system, the detection indicators include COD value, ammonia nitrogen value and total nitrogen value;

Step 3) Based on the detection indicators, control the inflow of sewage, the rotational speed of the biological turntable, the dissolved oxygen in the anoxic tank, the dissolved oxygen in the aerobic zone, the return flow of nitrification liquid, the return flow of sludge, the MLSS value of the adjustable combination tank, and Adjustable anoxic pool and adjustable aerobic pool ratio.

Specifically, the above steps also include the following specific control methods:

Method 1) When the influent temperature of the sewage is 10-12°C, the COD value is 200-300mg/L, the ammonia nitrogen value is 30-40mg/L, and the total nitrogen value is 40-50mg/L, control the influent amount of sewage as 8-8.5m ³ /h, the rotational speed of the biological turntable is 6-8r/min, the dissolved oxygen in the anoxic pool is 2-3mg/L, the dissolved oxygen in the aerobic zone is 2-4mg/L, and the reflux of the nitrification solution is 200 -250%, the sludge return rate is 50-100%, the MLSS value of the adjustable combined tank is 2500-3000mg/L, and the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:3.5 to 1:3;

Method 2) When the sewage influent temperature is 10-12°C, the COD value is 250-300mg/L, the ammonia nitrogen value is 35-45mg/L, and the total nitrogen value is 50-60mg/L, control the sewage inflow to 8-8.5m ³ /h, the rotational speed of the biological turntable is 7-8r/min, the dissolved oxygen in the anoxic pool is 2-2.5mg/L, the dissolved oxygen in the aerobic zone is 2-4mg/L, and the reflux of the nitrification solution is 250-300%, the sludge return rate is 70-100%, the MLSS value of the adjustable combined pool is 3000-3500mg/L, and the ratio of the adjustable anoxic pool to the adjustable aerobic pool is 1:1.6 to 1:2;

Method 3) When the sewage influent temperature is 8-12°C, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L, and the total nitrogen value is 55-70mg/L, control the sewage inflow as 8-8.5m ³ /h, the rotational speed of the biological turntable is 8-9r/min, the dissolved oxygen in the anoxic pool is 1.5-2mg/L, the dissolved oxygen in the aerobic zone is 3-4mg/L, and the reflux of the nitrification solution is 300 -350%, the sludge return rate is 80-100%, the MLSS value of the adjustable combined tank is 3500-4000mg/L, and the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.2 to 1:5;

Method 4) When the sewage influent temperature is 8-10°C, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L, and the total nitrogen value is 55-70mg/L, control the sewage inflow as 8-8.5m ³ /h, the rotational speed of the biological turntable is 8-9r/min, the dissolved oxygen in the anoxic pool is 1.5-2mg/L, the dissolved oxygen in the aerobic zone is 3-4mg/L, and the reflux of the nitrification solution is 300 -350%, the sludge return rate is 80-100%, the MLSS value of the adjustable combination tank is 4000-5000mg/L, and the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.1 to 1:5.

It should be noted that, when the influent water temperature is 12°C, after reaching the standard according to the above-mentioned instructions, in this stable and qualified system, among the microorganisms in the biofilm of the bioturntable, the clone library technology can be further used to determine the microbial population structure in the biofilm during this period. Analyze, extract, cultivate. Under the conditions of lower temperature and worse influent water quality, the extracted low-temperature microbial strains are added to further improve the efficiency of sewage treatment.

In actual work, if the total nitrogen content in the influent water is high, under the condition that the residence time in the aerobic zone is sufficient, if it is necessary to strengthen denitrification, the aerator head in the adjustable zone should be turned off, and the adjustable baffle should be turned to the second The bottom plate or the third bottom plate moves to adjust to an anoxic environment, providing additional denitrification, using the nitrate produced in the aerobic section as the electron acceptor, and using the endogenous organic carbon as the electron donor to enhance the denitrification effect.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A sewage low-temperature denitrification treatment system, characterized in that it includes an anoxic tank (1), an adjustable combination tank (2), an MBR membrane tank (3), a biological turntable (4), and a movable baffle (5) , guiding drive mechanism (6), internal return pipeline (7) and sludge return pipeline (8), wherein: The anoxic pool (1) is integrally connected with one end of the adjustable combination pool (2), and the other end of the adjustable combination pool (2) is connected with the bottom of the MBR membrane pool (3) through a pipeline; The biological turntable (4) is set inside the anoxic tank (1); The movable baffle (5) is arranged inside the adjustable combined pool (2), and divides the internal space of the adjustable combined pool (2) into an adjustable anoxic pool (201) and an adjustable aerobic pool (202). ), the bottom of the adjustable combination tank (2) is evenly arranged with aeration pipelines (203), and a plurality of bottom plates (204) are arranged between the aeration pipelines (203), and the top of the bottom plates (204) can be moved with The bottom of the baffle (5) is sealed, and one side of the bottom plate (204) is provided with a water outlet (2041); The guide driving mechanism (6) is used to drive the mobile baffle (5) to move to adjust the ratio of the adjustable anoxic pool (201) and the adjustable aerobic pool (202); The internal return pipeline (7) includes 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), and the internal return pipe (702 ) is connected to the internal return pump (701), and the other end of the internal return pipe (702) passes through the adjustable aerobic pool (202) and the adjustable anoxic pool (201) in turn, and then is set in the anoxic pool (1) ; The sludge return pipeline (8) includes a sludge return pump (801) and a sludge return pipe (802). The sludge return pump (801) is set at the bottom of the MBR membrane tank (3), and the sludge return One end of the pipe (802) is connected to the sludge return pump (801), and the other end of the sludge return pump (801) passes through the MBR membrane pool (3), the adjustable aerobic pool (202), and the adjustable anoxic pool ( 201) and then set in the anoxic pool (1). 2. A sewage low-temperature denitrification treatment system according to claim 1, characterized in that, the anoxic pool (1) is connected to the water inlet pipe, and the top of the anoxic pool (1) is provided with a sliding cover (101), The inside of the anoxic pool (1) is provided with a flow booster (102). 3. A sewage low-temperature denitrification treatment system according to claim 1, characterized in that, the top of the adjustable combination pool (2) and the MBR membrane pool (3) is provided with a top plate (205) and a slide plate (206 ). 4. A sewage low-temperature denitrification treatment system according to claim 1, characterized in that the aeration pipeline (203) is divided into independently controlled first area pipelines (2031), second area pipelines (2032 ) and the third area pipeline (2033), 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 area pipeline (2031) is arranged between the first bottom plate (2042) and the second bottom plate (2043); the second area pipeline (2032) is arranged between the second bottom plate (2043) and the third bottom plate (2044) ); the third area pipeline (2033) is arranged between the third bottom plate (2044) and the inner wall at the other end of the adjustable combination pool (2). 5. The sewage low-temperature denitrification treatment system according to claim 1, characterized in that, the inside of the MBR membrane pool (3) is provided with an MBR membrane module (301), and the MBR membrane module (301) is connected to Drainage pipe; the MBR membrane tank (3) is communicated with the adjustable combination tank (2) through the water pipe (302) at the bottom. 6. A sewage low-temperature denitrification treatment system according to claim 1, characterized in that, the biological turntable (1) includes a mounting beam (401), a bearing seat (402), a rotating shaft (403), a turntable (404 ) and turntable motor (405), where: The installation beam (401) is set in the anoxic pool (1) as a load-bearing part; the bearing seat (402) is set on the installation beam (401); the two ends of the rotating shaft (403) are installed on the bearing seat ( 402); multiple turntables (404) are set on the rotating shaft (403) in turn; the motor (405) is set on one side of the installation beam (401), and the turntable motor (405) passes through the reducer and coupling Drive the rotating shaft (403) to rotate; 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 sheets (408). 7. A sewage low-temperature denitrification treatment system according to claim 1, characterized in that, the bottom of the plate body of the movable baffle (5) is provided with a bottom sealing strip (501), and the two sides of the plate body are provided with There are side sealing strips (502), the top of the movable baffle (5) is fixedly connected with the movable beam (503), the two ends of the movable beam (503) are provided with sliders (504), and the sliders (504) are movable On the slide rail (505), the slide rail (505) is arranged on both sides of the top of the adjustable combination pool (2). 8. A sewage low-temperature denitrification treatment system according to claim 1, characterized in that, the guide driving mechanism (6) includes a rack (601), a moving gear (602), a transmission shaft (603), a transmission gear set (604) and guide motor (605), wherein: The two racks (601) are arranged on both sides of the top of the adjustable combination pool (2); The moving gear (602) is meshed with the rack (601); The moving gears (602) at both ends are set on both ends 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); The transmission gear set (604) includes a worm gear, a bevel gear set or a bevel gear set. 9. A sewage low-temperature denitrification treatment system according to claim 1, characterized in that it comprises the following control steps: Step 1) The water inlet temperature of the control system is 8-12°C; Step 2) Real-time detection of the sewage influent water quality of the system, the detection indicators include COD value, ammonia nitrogen value and total nitrogen value; Step 3) Based on the detection indicators, control the inflow of sewage, the rotational speed of the biological turntable, the dissolved oxygen in the anoxic tank, the dissolved oxygen in the aerobic zone, the return flow of nitrification liquid, the return flow of sludge, the MLSS value of the adjustable combination tank, and Adjustable anoxic pool and adjustable aerobic pool ratio. 10. A sewage low-temperature denitrification treatment system according to claim 9, characterized in that it comprises the following control method: Method 1) When the influent temperature of the sewage is 10-12°C, the COD value is 200-300mg/L, the ammonia nitrogen value is 30-40mg/L, and the total nitrogen value is 40-50mg/L, control the influent amount of sewage as 8-8.5m ³ /h, the rotational speed of the biological turntable is 6-8r/min, the dissolved oxygen in the anoxic pool is 2-3mg/L, the dissolved oxygen in the aerobic zone is 2-4mg/L, and the reflux of the nitrification solution is 200 -250%, the sludge return rate is 50-100%, the MLSS value of the adjustable combined tank is 2500-3000mg/L, and the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:3.5 to 1:3; Method 2) When the sewage influent temperature is 10-12°C, the COD value is 250-300mg/L, the ammonia nitrogen value is 35-45mg/L, and the total nitrogen value is 50-60mg/L, control the sewage inflow to 8-8.5m ³ /h, the rotational speed of the biological turntable is 7-8r/min, the dissolved oxygen in the anoxic pool is 2-2.5mg/L, the dissolved oxygen in the aerobic zone is 2-4mg/L, and the reflux of the nitrification solution is 250-300%, the sludge return rate is 70-100%, the MLSS value of the adjustable combined pool is 3000-3500mg/L, and the ratio of the adjustable anoxic pool to the adjustable aerobic pool is 1:1.6 to 1:2; Method 3) When the sewage influent temperature is 8-12°C, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L, and the total nitrogen value is 55-70mg/L, control the sewage inflow as 8-8.5m ³ /h, the rotational speed of the biological turntable is 8-9r/min, the dissolved oxygen in the anoxic pool is 1.5-2mg/L, the dissolved oxygen in the aerobic zone is 3-4mg/L, and the reflux of the nitrification solution is 300 -350%, the sludge return rate is 80-100%, the MLSS value of the adjustable combined tank is 3500-4000mg/L, and the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.2 to 1:5; Method 4) When the sewage influent temperature is 8-10°C, the COD value is 250-300mg/L, the ammonia nitrogen value is 40-50mg/L, and the total nitrogen value is 55-70mg/L, control the sewage inflow as 8-8.5m ³ /h, the rotational speed of the biological turntable is 8-9r/min, the dissolved oxygen in the anoxic pool is 1.5-2mg/L, the dissolved oxygen in the aerobic zone is 3-4mg/L, and the reflux of the nitrification solution is 300 -350%, the sludge return rate is 80-100%, the MLSS value of the adjustable combination tank is 4000-5000mg/L, and the ratio of the adjustable anoxic tank to the adjustable aerobic tank is 1:1.1 to 1:5.

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