Quantitative control method of satiation hunger ratio and continuous flow aerobic granular sludge system

Abstract

The application provides a method for quantitative regulation of satiation-starvation ratio and a continuous-flow aerobic granular sludge system, and relates to the field of continuous-flow aerobic granular sludge cultivation. The continuous-flow aerobic granular sludge system comprises a reaction tank, and the reaction tank comprises a satiation zone and a starvation zone. The method comprises the following steps: calculating a real-time influent organic load according to a real-time influent flow rate and a real-time influent chemical oxygen demand concentration of the reaction tank; calculating an ideal sludge concentration in the satiation zone according to a critical microbe-to-food ratio and the real-time influent organic load; calculating an ideal sludge return flow rate of the satiation zone according to the real-time influent flow rate, the ideal sludge concentration in the satiation zone and a sludge return concentration; and regulating the sludge return flow rate of the satiation zone until the sludge return flow rate is the same as the ideal sludge return flow rate. The application solves the problem that the satiation-starvation ratio cannot be quantitatively calculated and regulated in the prior art, and the satiation-starvation effect of the system is poor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of continuous-flow aerobic granular sludge cultivation, and particularly relates to a method for quantitatively regulating satiation-starvation ratio and a continuous-flow aerobic granular sludge system. BACKGROUND

[0002] The aerobic granular sludge is granular activated sludge formed by self-agglomeration of microorganisms, and has the advantages of good settling performance, high biomass, and simultaneous removal of carbon, nitrogen and phosphorus. A large number of literatures report that a periodic satiation-starvation environment is conducive to enrichment of slow-growing microorganisms (such as PAO and GAO) that store internal carbon sources, thereby promoting granulation. At present, granulation strategies such as control of satiation / famine alternation and hydraulic selection pressure have been successfully implemented in the engineering application of the aerobic granular sludge technology in a sequencing batch reactor (SBR) reactor, but it is difficult to achieve a relatively stable satiation-starvation environment in a continuous-flow reactor due to the direct mixing of influent, low mass transfer efficiency, and difficulty in controlling water quality and influent quantity.

[0003] In the prior art, the satiation-starvation condition is qualitatively created by regulating the influent mode or sludge return strategy, but there is little application research on the satiation-starvation condition, and it is impossible to quantitatively account for and regulate the satiation-starvation ratio, resulting in poor satiation-starvation effect of the system, and further affecting the granulation process of the continuous-flow aerobic granular sludge system.

[0004] Previous studies have shown through theoretical derivation that the satiation-starvation ratio is a function of the number of reactor chambers and the Damkohler number (Da), and Da depends on the food-microbe ratio (F / M). Therefore, for a continuous-flow aerobic granular sludge system with a determined reactor structure and influent quality, F / M is the main factor affecting the satiation-starvation ratio. SUMMARY

[0005] The present application provides a method for quantitatively regulating satiation-starvation ratio and a continuous-flow aerobic granular sludge system, to solve the problem that in the prior art, the satiation-starvation condition is qualitatively created by regulating the influent mode or setting sludge return, but there is little application research on the satiation-starvation condition, and it is impossible to quantitatively account for and regulate the satiation-starvation ratio, resulting in poor satiation-starvation effect of the system, and further affecting the granulation process of the continuous-flow aerobic granular sludge system.

[0006] In a first aspect, the present application provides a method for quantitatively regulating satiation-starvation ratio, and a continuous-flow aerobic granular sludge system including a reaction tank, wherein the reaction tank includes a satiation zone and a starvation zone, and the method includes:

[0007] According to the real-time influent flow rate and the real-time influent chemical oxygen demand concentration of the reaction tank, the real-time influent organic load is calculated;

[0008] According to the critical food-micro ratio and the real-time influent organic load, the ideal sludge concentration in the satiation zone is calculated;

[0009] According to the real-time influent flow rate, the ideal sludge concentration in the satiation zone and the sludge return concentration, the ideal sludge return flow rate in the satiation zone is calculated;

[0010] The sludge return flow rate in the satiation zone is regulated until the sludge return flow rate is the same as the ideal sludge return flow rate.

[0011] In a possible design, the reaction tank includes multiple sub-zones, and the multiple sub-zones include: an anaerobic zone, an anoxic zone and an aerobic zone;

[0012] Before the real-time influent organic load is calculated according to the real-time influent flow rate and the real-time influent chemical oxygen demand concentration of the reaction tank, the method further includes:

[0013] According to the total hydraulic retention time and the first satiation-starvation ratio, a satiation-starvation ratio critical position is obtained, and the multiple sub-zones are divided into a satiation zone and a starvation zone according to the satiation-starvation ratio critical position; wherein the first satiation-starvation ratio is selected from a preset satiation-starvation ratio interval;

[0014] The influent chemical oxygen demand concentration is increased, and when the sludge return ratio in the satiation zone, the sludge concentration in the anaerobic zone, the chemical oxygen demand concentration at the satiation-starvation ratio critical position and the chemical oxygen demand concentration change value at the satiation-starvation ratio critical position meet their respective preset critical conditions, multiple parameter values are obtained; wherein the multiple parameter values include: a critical chemical oxygen demand concentration, an influent flow rate, an activated sludge concentration in the anaerobic zone and a reaction tank volume in the satiation zone;

[0015] The critical food-micro ratio is calculated according to the multiple parameter values.

[0016] In a possible design, each sub-zone is divided into multiple chambers, and the total hydraulic retention time includes: a chamber hydraulic retention time of each chamber, wherein the total hydraulic retention time and the chamber hydraulic retention time are both time periods;

[0017] According to the total hydraulic retention time and the first satiation-starvation ratio, the satiation-starvation ratio critical position is obtained, including:

[0018] According to the first satiation-starvation ratio and the total hydraulic retention time, a hydraulic retention time point corresponding to the first satiation-starvation ratio is obtained;

[0019] The chamber in which the hydraulic retention time point is located is taken as the satiation-starvation ratio critical position.

[0020] In a possible design, the preset critical conditions include: a sludge return ratio range of the satiation zone, a sludge concentration range of the anaerobic zone, a chemical oxygen demand concentration threshold of the satiation-starvation ratio critical position, and a chemical oxygen demand concentration variation threshold of the satiation-starvation ratio critical position.

[0021] The satiation-starvation ratio critical position is a terminal chamber of the satiation zone, and a chamber adjacent to the terminal chamber of the satiation zone is a front-end chamber of the starvation zone.

[0022] The satiation-starvation ratio critical position is located at the terminal of a plurality of chambers of the satiation zone, and the terminal of the plurality of chambers of the satiation zone is on the same side as the front end of a plurality of chambers of the starvation zone.

[0023] In a possible design, when the sludge return ratio of the satiation zone, the sludge concentration of the anaerobic zone, the chemical oxygen demand concentration of the satiation-starvation ratio critical position, and the chemical oxygen demand concentration variation of the satiation-starvation ratio critical position meet the respective preset critical conditions, the method further includes:

[0024] The sludge return ratio and the sludge concentration are regulated until the sludge return ratio meets the sludge return ratio range, and the sludge concentration meets the sludge concentration range, and then the regulated sludge return ratio and sludge concentration are maintained.

[0025] The influent chemical oxygen demand concentration is gradually increased, and during the process, the real-time influent chemical oxygen demand concentration, and the chemical oxygen demand concentration, influent flow rate, and activated sludge concentration of the terminal chamber and the front-end chamber at each time point are recorded.

[0026] When the chemical oxygen demand concentration of the terminal chamber is less than the chemical oxygen demand concentration threshold, and the chemical oxygen demand concentration variation between the chemical oxygen demand concentration of the terminal chamber and the chemical oxygen demand concentration of the front-end chamber is less than the chemical oxygen demand concentration variation threshold, the real-time influent chemical oxygen demand concentration at the first time point is taken as the critical chemical oxygen demand concentration; the first time point is the time point before the second time point; and the second time point is the time point at which the chemical oxygen demand concentration of the terminal chamber is greater than or equal to the chemical oxygen demand concentration threshold, or the chemical oxygen demand concentration variation is greater than or equal to the chemical oxygen demand concentration variation threshold.

[0027] In a possible design, after the sludge return flow of the satiation zone is regulated until the sludge return flow is the same as the ideal sludge return flow, the method further includes:

[0028] The real-time satiation-starvation ratio is regularly detected, the real-time satiation-starvation ratio is adjusted according to the needs of different cultivation stages of the granular sludge, and the critical satiation-starvation ratio is updated.

[0029] In a second aspect, the application provides a continuous-flow aerobic granular sludge system, which includes a reaction tank.

[0030] The reaction tank comprises a plurality of sub-zones, which are divided into a satiation zone and a hunger zone;

[0031] The plurality of sub-zones comprises an anaerobic zone, an anoxic zone and an aerobic zone.

[0032] One end of the anaerobic zone is on the same side as the other end of the anoxic zone, and one end of the aerobic zone is on the same side as the other end of the anaerobic zone and the other end of the anoxic zone.

[0033] In one possible design, the anaerobic zone and the anoxic zone each comprises a plurality of chambers, partition walls, water passing holes and stirring devices; each chamber is obtained by equally dividing the anaerobic zone or the anoxic zone by a partition wall, each partition wall is provided with a water passing hole, and the liquid between adjacent two chambers is communicated through the water passing hole; a certain height of baffle is arranged in each chamber of the anaerobic zone, and a stirring device is arranged in each chamber of the anoxic zone.

[0034] The aerobic zone is communicated with the anaerobic zone and the anoxic zone through the water passing holes, and the aerobic zone comprises a plurality of aerobic tanks, baffles, microporous aeration devices and stirring devices; each aerobic tank is obtained by equally dividing the aerobic zone by a baffle.

[0035] In one possible design, the system further comprises a sedimentation device and a reflux device.

[0036] One end of the sedimentation device is on the same side as the other end of the aerobic zone, and the sedimentation device comprises a flow guide plate, a sludge reflux hopper, a sludge discharge hopper, a sludge sedimentation zone and a sludge scraping device; the flow guide plate is arranged between the top and the middle of the sedimentation device, the sludge reflux hopper is arranged at the bottom of the water inlet end of the sedimentation device, the sludge discharge hopper is arranged at the bottom of the water outlet end of the sedimentation device, and the sludge scraping device is arranged in the sludge sedimentation zone in the middle of the sedimentation device; the flow guide plate and the sludge reflux hopper are arranged at the front end of the sedimentation device, and the sludge scraping device is arranged in the sludge sedimentation zone in the middle of the sedimentation device.

[0037] The reflux device comprises a nitrification liquid reflux device and a sludge reflux device; the nitrification liquid reflux device is connected with the water outlet end of the aerobic zone and the anaerobic zone and the anoxic zone, and the sludge reflux device is connected with the sludge reflux hopper and the water inlet end of the anaerobic zone.

[0038] In one possible design, the dissolved oxygen concentration of the anaerobic zone should be maintained below 0.05 mg / L, the oxidation-reduction potential of the anaerobic zone should be maintained at-150 to-225 mV, the dissolved oxygen concentration of the water outlet end of the aerobic zone should be maintained below 0.5 mg / L, and the concentration of the sludge reflux hopper of the sedimentation tank should be maintained above 12000 mg / L.

[0039] In one possible design, the system further comprises an intelligent control device.

[0040] The intelligent control device is signal connected with the stirring device, and is used for controlling the switch and stirring speed of the stirring device; the intelligent control device is signal connected with the reflux pump of the reflux device, and is used for adjusting the switch and reflux flow of the reflux pump; the intelligent control device is signal connected with the microporous aeration device, and is used for controlling the switch and aeration flow of the microporous aeration device.

[0041] The intelligent control device is signal connected with the on-line monitoring equipment of the anaerobic zone, the anoxic zone, the aerobic zone and the sedimentation device respectively.

[0042] In a possible design, the aerobic zone effluent section is simultaneously provided with the microporous aeration device and the stirring device, the stirring device is long-term opened, and the start-stop of the microporous aeration device in the effluent section is regulated according to the signal transmitted by the on-line monitoring equipment of the aerobic zone.

[0043] The application provides a quantitative regulation method of satiation-hunger ratio and a continuous-flow aerobic granular sludge system. The continuous-flow aerobic granular sludge system comprises a reaction tank, and the reaction tank comprises a satiation zone and a hunger zone. The real-time influent flow and the real-time influent chemical oxygen demand concentration of the reaction tank are used to calculate the real-time influent organic load. The critical satiation-hunger ratio and the real-time influent organic load are used to calculate the ideal sludge concentration of the satiation zone. The real-time influent flow, the ideal sludge concentration of the satiation zone and the sludge reflux concentration are used to calculate the ideal sludge reflux flow of the satiation zone. The sludge reflux flow of the satiation zone is regulated until the sludge reflux flow is the same as the ideal sludge reflux flow. Compared with the prior art, the satiation-hunger ratio is quantitatively calculated and regulated by regulating the influent mode and setting the sludge reflux, so that the stability of the satiation-hunger environment in the continuous-flow system is greatly improved, and the rapid cultivation of the AGS of the continuous-flow system is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0045] Figure 1 The structure of a continuous-flow aerobic granular sludge system provided by the embodiments of the present applicationFigure One

[0046] Figure 2 Flowchart of a quantitative regulation method of satiety-hunger ratio provided for an embodiment of the present application Figure One

[0047] Figure 3 Flowchart of a quantitative regulation method of satiety-hunger ratio provided for an embodiment of the present application Figure Two

[0048] Figure 4 Flowchart of a quantitative regulation method of satiety-hunger ratio provided for an embodiment of the present application Figure Three

[0049] Figure 5 Flowchart of a quantitative regulation method of satiety-hunger ratio provided for an embodiment of the present application Figure Four

[0050] Reference signs:

[0051] 100 - continuous flow aerobic granular sludge system

[0052] 110 - anaerobic zone; 120 - anoxic zone; 130 - aerobic zone; 140 - sedimentation device

[0053] 111 - chamber; 112 - partition wall; 114 - stirring device

[0054] 131 - aerobic tank; 132 - baffle; 133 - microporous aeration device

[0055] 141 - guide plate; 142 - sludge return hopper; 143 - sludge discharge hopper; 144 - sludge sedimentation zone; 145 - sludge scraping device DETAILED DESCRIPTION

[0056] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made with reference to the accompanying drawings in which like reference numerals refer to like elements throughout. The following description of exemplary embodiments is not representative of all possible embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0057] ​​​​​In the embodiments of the present application, the terms such as "first", "second" and the like are used to distinguish between similar or identical items or items with substantially the same function and effect. Those skilled in the art can understand that the terms such as "first", "second" and the like do not limit the quantity and execution order, and the terms such as "first", "second" and the like do not necessarily mean different. It should be noted that in the embodiments of the present application, the words "exemplary" or "for example" are used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words "exemplary" or "for example" are intended to present the relevant concept in a specific manner. In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more.

[0058] It should be noted that "at" in the embodiments of the present application can be at the moment when a certain condition occurs, or within a period of time after a certain condition occurs, which is not limited in the embodiments of the present application. In addition, the quantitative regulation method of satiation-hunger ratio and the continuous flow aerobic granular sludge system provided in the embodiments of the present application are only examples, and the quantitative regulation method of satiation-hunger ratio can include more or less content.

[0059] In order to clearly describe the technical solutions of the embodiments of the present application, the following briefly introduces some terms and technologies involved in the embodiments of the present application:

[0060] Aerobic granular sludge (AGS): Aerobic granular sludge is granular activated sludge formed by microbial self-aggregation, which has a compact structure, good settling performance and excellent decontamination capacity.

[0061] Satiation-hunger condition is a source of stress that can cause changes in microbial populations, also known as microbial selection pressure. In the satiation phase, easily biodegradable substrates accumulate in the form of polymers in the bodies of slow-growing microorganisms. Subsequently, in the hunger phase, these stored polymers become resources for microbial growth. Studies have found that satiation-hunger alternating conditions stimulate EPS secretion and enhance surface hydrophobicity, thereby promoting microbial aggregation. In addition, satiation-hunger conditions tend to favor the proliferation of slow-growing bacteria such as glycogen-accumulating organisms (GAOs), polyphosphate-accumulating organisms (PAOs) and denitrifying phosphate-accumulating organisms (DPAOs), which help to improve nutrient removal performance and promote long-term stability.

[0062] Food to microorganism ratio (F / M): also called sludge loading, is a ratio reflecting the relationship between food and the number of microorganisms. The F / M size will directly affect the growth rate of activated sludge, the removal rate of organic pollutants, oxygen utilization rate and sludge settling performance. In the continuous flow aerobic granular sludge system, if the F / M is too large, the organic matter in the influent cannot be fully absorbed in the satiation zone and enters the aerobic zone, resulting in a large number of reproduction of ordinary heterotrophic microorganisms, and the sludge settling performance is difficult to improve, and in severe cases, it will also lead to filamentous bacteria expansion; if the F / M is too small, the functional microorganisms in the anaerobic zone cannot fully absorb the organic matter to grow and reproduce, and the granular sludge is difficult to form, which will also affect the nitrogen and phosphorus removal efficiency of the system.

[0063] Compared with the traditional activated sludge process, the AGS can save 50% to 75% of the land area, 20% to 25% of the operation cost and 23% to 40% of the power consumption.

[0064] But because the influent in the continuous flow reactor is easy to mix directly and the water inflow is not easy to control, it is difficult to achieve a relatively stable satiation-hunger environment, and it is difficult to gradually reduce the sludge settling time as in the sequencing batch reactor to apply selective pressure to the activated sludge and the backflow mode of the granular sludge, etc. Problems, it is difficult to quickly realize the granulation of sludge and the stable operation of the granular sludge system in the continuous flow reactor, which leads to the fact that the AGS in the continuous flow field has not made substantial breakthroughs in popularization and application.

[0065] At present, most of the application researches on satiation-hunger conditions are to qualitatively create certain satiation-hunger conditions from the influent mode or set sludge backflow, but the satiation-hunger ratio of the system has not been quantitatively calculated and controlled by using the influent organic load and other parameters; in addition, the anaerobic zone of the current sewage treatment plant is difficult to form an ideal plug flow flow pattern, and the rapid mixing of the influent causes further dilution of the organic matter concentration, resulting in poor satiation-hunger effect of the system.

[0066] Therefore, in order to solve the above technical problems, the embodiment of the present application provides a quantitative regulation method of satiation-hunger ratio and a continuous flow aerobic granular sludge system, which can be used in the field of continuous flow aerobic granular sludge cultivation. The inventive concept of the present application is how to effectively improve the granulation efficiency of the continuous flow aerobic granular sludge system.

[0067] Figure 1 The structure of a continuous flow aerobic granular sludge system provided by the embodiment of the present application is shown in Figure One . As shown in Figure 1 , the continuous flow aerobic granular sludge system 100 comprises an anaerobic zone 110, an anoxic zone 120, an aerobic zone 130, a sedimentation device 140, and further comprises a backflow device.

[0068] As shown in Figure 1As shown, the dashed lines divide the continuous flow aerobic granular sludge system 100 into multiple chambers 111. Among them, the four chambers in the upper left corner are the anaerobic zone 110, the four chambers in the upper right corner are the anoxic zone 120, the six chambers in the lower right corner are the aerobic zone 130, and the lower left corner is the sedimentation device 140.

[0069] It is understandable that the dashed boxes outside the anaerobic zone 110, anoxic zone 120, aerobic zone 130 and sedimentation device 140 in the figure are only for distinguishing different areas and are not used as actual area boundaries.

[0070] The reaction tank consists of an anaerobic zone 110, an anoxic zone 120, and an aerobic zone 130. The reaction tank is divided into a saturated zone and a starved zone based on the critical position of the saturation-starvation ratio.

[0071] Specifically, one end of the anaerobic zone 110 is on the same side as the other end of the anoxic zone 120, and one end of the aerobic zone 130 is on the same side as both the other end of the anaerobic zone 110 and the other end of the anoxic zone 120.

[0072] Both the anaerobic zone 110 and the anoxic zone 120 include: multiple chambers, partition walls, water passages, and a stirring device.

[0073] For example, with Figure 1 The anaerobic zone 110 is used as an example for explanation. The chambers, partitions, water passages, and stirring devices of the anoxic zone 120 can be referenced from the example provided. Figure 1 The description of anaerobic zone 110 is provided, but the specific structure of anoxic zone 120 will not be elaborated upon.

[0074] Among them, with Figure 1 Taking the middle section of the structure as an example, the partition wall is... Figure 1 The middle is marked as 112, and the chamber is in Figure 1 The middle part is marked as 111, and the stirring device is in Figure 1 The Chinese character is marked as 114.

[0075] Each chamber 111 is obtained by dividing the anaerobic zone 110 or the anoxic zone 120 equally by partition wall 112. Each partition wall 112 is provided with two water passage holes, one above the other. The liquid between two adjacent chambers 111 is connected through the water passage holes. Each chamber 111 is provided with a stirring device 114.

[0076] For example, the hydraulic retention time in each chamber of anaerobic zone 110 and anoxic zone 120 is controlled to be within 30 minutes.

[0077] For example, by controlling the dissolved oxygen concentration at the outlet of the aerobic zone, the DO concentration in each chamber 111 of the anaerobic zone 110 is maintained at 0-0.05 mg / L, while the DO concentration in each chamber 111 of the anoxic zone 120 is maintained at 0.2-0.8 mg / L.

[0078] The aerobic zone 130 is in communication with the anaerobic zone 110 and the anoxic zone 120 through water holes, and the aerobic zone comprises a plurality of aerobic tanks 131, baffles 132, microporous aeration devices 133, and water outlet stirring devices 134.

[0079] Each of the aerobic tanks 131 is obtained by equally dividing the aerobic zone through the baffles 132.

[0080] For example, the aerobic zone 130 controls the DO concentration at the front end and the middle end of the aerobic tank 131 to be 1.5-4.5 mg / L through the opening and closing degree of the air inlet electromagnetic valve, the water outlet section is provided with a stirring device and is started for a long time, and the intelligent control device controls the opening and closing of the air inlet electromagnetic valve at the water outlet end of the microporous aeration device according to the ammonia nitrogen concentration at the water outlet end of the aerobic zone.

[0081] Specifically, in order to avoid the backflow of sludge and the backflow of nitrification liquid, which brings a large amount of oxygen from the aerobic tank to the anaerobic tank and the anoxic tank, and affects the DO concentration of the anaerobic tank and the anoxic tank, thereby affecting the absorption of organic matter in the influent by functional microorganisms such as phosphorus accumulating organisms (PAO) and denitrifying phosphorus accumulating organisms (DPAO) in the anaerobic tank and the denitrification process in the anoxic section, and finally affecting the effectiveness of the satiation-hunger condition, a stirring device is installed at the water outlet section of the aerobic tank to mix the sludge and set an intermittent aeration program, and when the intelligent control system receives the ammonia nitrogen concentration at the water outlet end of the aerobic zone being higher than 1 mg / L, the air inlet electromagnetic valve at the water outlet section is opened, otherwise the air inlet electromagnetic valve at the water outlet section is in a closed state.

[0082] One end of the sedimentation device 140 is on the same side as the other end of the aerobic zone 130, and the sedimentation device 140 comprises a flow guide plate 141, a sludge backflow hopper 142, a sludge discharge hopper 143, a sludge sedimentation zone 144, and a sludge scraping device 145.

[0083] The flow guide plate 141 is arranged at the middle upper part of the water inlet end of the sedimentation device 140, i.e. between the top part and the middle part of the water inlet end.

[0084] The sludge backflow hopper 142 is arranged at the bottom of the water inlet end of the sedimentation device 140, the sludge discharge hopper 143 is arranged at the bottom of the water outlet end of the sedimentation device 140, and the sludge scraping device 145 is arranged in the sludge sedimentation zone of the middle part of the sedimentation device 140; the flow guide plate 141 is arranged at a position 0.5-1.0 m from the water inlet end of the sedimentation device 140, has a submerged depth of 0.3-0.5 m, and is 0.1-0.15 m higher than the water surface.

[0085] Specifically, the sludge scraping device can realize bidirectional sludge scraping, and scraping sludge in the direction of the water inlet end can scrape sludge with good sedimentation performance to the sludge backflow hopper, and scraping sludge in the direction of the water outlet end can scrape sludge with poor sedimentation performance to the sludge discharge hopper, thereby realizing selective backflow and elimination of activated sludge.

[0086] Specifically, the water inlet end of the sedimentation device 140 is close to the water inlet end of the anaerobic zone 110, and the water outlet end of the sedimentation device 140 is close to the water outlet end of the aerobic zone 130.

[0087] The reflux device includes a nitrification liquid reflux device and a sludge reflux device. The nitrification liquid reflux device is connected to the water outlet end of the aerobic zone 130 and the water inlet end of the anaerobic zone 110 and the anoxic zone 120, respectively. The sludge reflux device is connected to the sludge reflux hopper 142 and the water inlet end of the anaerobic zone 110.

[0088] Optionally, the oxidation-reduction potential of the anaerobic zone is maintained at -150 to -225 mV, the dissolved oxygen concentration of the water outlet end of the aerobic zone is maintained at 0.5 mg / L or less, and the concentration of the sludge reflux hopper of the sedimentation tank is maintained at 12000 mg / L or more.

[0089] Optionally, the system further comprises an intelligent control device; the intelligent control device is signal connected with the stirring device, and the intelligent control device is used for controlling the on-off and stirring rate of the stirring device; the intelligent control device is signal connected with the reflux pump of the reflux device, and the intelligent control device is used for adjusting the on-off and reflux flow of the reflux pump; the intelligent control device is signal connected with the microporous aeration device, and the intelligent control device is used for controlling the on-off and aeration flow of the microporous aeration device; the intelligent control device is signal connected with the online monitoring equipment of the anaerobic zone, the anoxic zone, the aerobic zone and the sedimentation device respectively.

[0090] Optionally, the water outlet section of the aerobic zone is simultaneously provided with the microporous aeration device and the stirring device, the stirring device is long-term opened, and the start-stop of the microporous aeration device in the water outlet section is adjusted and controlled according to the signal transmitted by the online monitoring equipment of the aerobic zone.

[0091] Figure 2 A flowchart of a quantitative regulation method of a satiation hunger ratio provided by an embodiment of the present application Figure One As shown in Figure 2 , the method is applied to a continuous flow aerobic granular sludge system, the continuous flow aerobic granular sludge system includes a reaction tank, the reaction tank includes a satiation zone and a hunger zone, and the method includes:

[0092] S101, calculating a real-time influent organic load according to a real-time influent flow and a real-time influent chemical oxygen demand concentration of the reaction tank.

[0093] Specifically, the calculation formula of the real-time influent organic load F is:

[0094]

[0095] Wherein, the unit of F is kgCOD / (m 3 ·d); C is the real-time influent chemical oxygen demand concentration, the unit is mg / L; Q is the real-time influent flow, the unit is m 3V is the volume of the reaction tank, in m 3 .

[0096] S102, calculating the ideal sludge concentration in the satiation zone according to the critical food-microbe ratio and the real-time influent organic load.

[0097] Specifically, the calculation formula of the ideal sludge concentration M0 in the satiation zone under the influent condition is:

[0098]

[0099] wherein the unit of M0 is kgMLSS / m 3 ; A is the critical food-microbe ratio, in kgCOD / (kg MLSS·d).

[0100] S103, calculating the ideal sludge return flow in the satiation zone according to the real-time influent flow, the ideal sludge concentration in the satiation zone and the sludge return concentration.

[0101] Specifically, the calculation formula of the ideal sludge return flow V1 in the satiation zone is:

[0102]

[0103] wherein M1 is the sludge concentration at the bottom of the sludge return tank, in kgMLSS / m 3 ; the unit of V1 is m 3 ; a1 is the ratio of the first sludge return concentration to the first bottom sludge concentration of the first sludge return tank.

[0104] Specifically, the empirical value of a1 is generally set to 0.6-0.8, which can be calculated by averaging multiple actual sampling detections, and the value needs to be adjusted regularly during the cultivation of granular sludge.

[0105] S104, regulating the sludge return flow in the satiation zone until the sludge return flow is the same as the ideal sludge return flow.

[0106] Optionally, the sludge return flow in the satiation zone is regulated at regular times until the sludge return flow is the same as the ideal sludge return flow.

[0107] It should be noted that after step S104, it further includes:

[0108] periodically detecting the real-time satiation-starvation ratio, adjusting the real-time satiation-starvation ratio according to the needs of different cultivation stages of the granular sludge, and updating the critical food-microbe ratio.

[0109] In the embodiment, the concentration change of the chemical oxygen demand in the satiation zone is monitored regularly, and the satiation-starvation ratio of the system is calculated (usually detected once every half month, and continuously detected for 3 days each time). If the satiation-starvation ratio at this time is less than the lower limit of the set range, the concentration of the influent chemical oxygen demand can be increased until the satiation-starvation ratio of the system returns to the set range, and the critical micro-feeding ratio of the satiation zone and the ideal sludge return flow rate are recalculated and adjusted according to steps S101 to S104.

[0110] The embodiment provides a quantitative regulation method of a satiation-starvation ratio and a continuous-flow aerobic granular sludge system. The continuous-flow aerobic granular sludge system comprises a reaction tank, and the reaction tank comprises a satiation zone and a starvation zone. The real-time influent organic load is calculated according to the real-time influent flow rate and the real-time influent chemical oxygen demand concentration of the reaction tank. The ideal sludge concentration in the satiation zone is calculated according to the critical micro-feeding ratio and the real-time influent organic load. The ideal sludge return flow rate of the satiation zone is calculated according to the real-time influent flow rate, the ideal sludge concentration in the satiation zone and the sludge return concentration. The sludge return flow rate of the satiation zone is regulated until the sludge return flow rate is the same as the ideal sludge return flow rate. Compared with the prior art, the satiation-starvation ratio is quantitatively calculated and regulated by regulating the sludge return flow rate of the satiation zone, so that the satiation-starvation effect of the system is improved, and the granulation efficiency of the continuous-flow aerobic granular sludge system is improved.

[0111] Figure 3 The embodiment provides a quantitative regulation method of a satiation-starvation ratio and a continuous-flow aerobic granular sludge system. The continuous-flow aerobic granular sludge system comprises a reaction tank, and the reaction tank comprises a satiation zone and a starvation zone. The real-time influent organic load is calculated according to the real-time influent flow rate and the real-time influent chemical oxygen demand concentration of the reaction tank. The ideal sludge concentration in the satiation zone is calculated according to the critical micro-feeding ratio and the real-time influent organic load. The ideal sludge return flow rate of the satiation zone is calculated according to the real-time influent flow rate, the ideal sludge concentration in the satiation zone and the sludge return concentration. The sludge return flow rate of the satiation zone is regulated until the sludge return flow rate is the same as the ideal sludge return flow rate. Compared with the prior art, the satiation-starvation ratio is quantitatively calculated and regulated by regulating the sludge return flow rate of the satiation zone, so that the satiation-starvation effect of the system is improved, and the granulation efficiency of the continuous-flow aerobic granular sludge system is improved. Figure Two , the reaction tank comprises a plurality of subzones, and the plurality of subzones comprise an anaerobic zone, an anoxic zone and an aerobic zone. Before S101, the method further comprises the following steps: Figure 2 As shown in the embodiment, the reaction tank comprises a plurality of subzones, and the plurality of subzones comprise an anaerobic zone, an anoxic zone and an aerobic zone. Before S101, the method further comprises the following steps: Figure 3

[0112] S201, the satiation-starvation ratio critical position is obtained according to the total hydraulic retention time and the first satiation-starvation ratio, and the plurality of subzones are divided into the satiation zone and the starvation zone according to the satiation-starvation ratio critical position.

[0113] The first satiation-starvation ratio is selected from a preset satiation-starvation ratio range. According to literature reports, the satiation-starvation ratio range of the continuous-flow aerobic granular sludge cultivation system can be set to 0.25-0.5. In the initial stage of starting, the first satiation-starvation ratio can be set to 0.5 for rapid enrichment of microorganisms.

[0114] ​S202, when the sludge return ratio, the sludge concentration in the anaerobic zone, the chemical oxygen demand concentration at the satiation-starvation ratio critical position, and the chemical oxygen demand concentration change value at the satiation-starvation ratio critical position meet the respective preset critical conditions, obtaining a plurality of parameter values.

[0115] The plurality of parameter values include: the critical chemical oxygen demand concentration, the influent flow rate, the activated sludge concentration in the anaerobic zone, and the reaction tank volume.

[0116] Specifically,

[0117] The preset critical conditions include: the sludge return ratio range of the satiation zone, the sludge concentration range of the anaerobic zone, the chemical oxygen demand concentration threshold at the satiation-starvation ratio critical position, and the chemical oxygen demand concentration change threshold at the satiation-starvation ratio critical position.

[0118] The satiation-starvation ratio critical position is the terminal chamber of the satiation zone, and the chamber adjacent to the terminal chamber of the satiation zone is the front-end chamber of the starvation zone.

[0119] The satiation-starvation ratio critical position is located at the terminal of the plurality of chambers of the satiation zone, and the terminal of the plurality of chambers of the satiation zone is on the same side as the front end of the plurality of chambers of the starvation zone.

[0120] S203, calculating the critical micro-food ratio according to the plurality of parameter values.

[0121] Specifically, the calculation formula of the critical micro-food ratio A is:

[0122]

[0123] Wherein, F is the real-time influent organic load, the unit is kg COD / m 3 .d; C is the real-time influent chemical oxygen demand concentration, the unit is mg / L; Q is the real-time influent flow rate, the unit is m 3 / d; V is the reaction tank volume, the unit is m 3 ; the unit of A is kg COD / (kg MLSS·d); M is the mixed liquor suspended solids concentration (MLSS) in the reaction tank, the unit is g / L or kg / m 3 .

[0124] In this embodiment, the satiation-starvation ratio critical position of the system and the micro-food ratio of the satiation period of the system are determined, and the system satiation-starvation ratio is regulated within a set range based on the satiation-starvation ratio critical position of the system and the satiation period of the system, which greatly improves the stability of the satiation-starvation environment in the continuous flow system and provides the possibility for rapid cultivation of the continuous flow system AGS.

[0125] Figure 4 A flowchart of a quantitative regulation method of a satiation-starvation ratio provided in an embodiment of the present applicationFigure Three In Figure 2 and Figure 3 the embodiment, as shown in Figure 4 , each partition is divided into multiple chambers, and the total hydraulic retention time includes a chamber hydraulic retention time of each chamber, wherein the total hydraulic retention time and the chamber hydraulic retention time are time periods; the specific implementation steps of S201 include:

[0126] S301, obtaining a hydraulic retention time point corresponding to the first satiation hunger ratio according to the first satiation hunger ratio and the total hydraulic retention time.

[0127] S302, taking the chamber where the hydraulic retention time point is located as the satiation hunger ratio critical position.

[0128] For example, the total hydraulic retention time of a biochemical stage of a certain sewage treatment device is 12h, the anaerobic zone is 2h, the anoxic zone is 3h, the aerobic zone is 7h, and the system satiation hunger ratio is 0.5, so the satiation zone accounts for 4h.

[0129] The end of the satiation zone is in the second chamber of the anoxic zone, and the chamber is set as the satiation hunger ratio critical position.

[0130] In this embodiment, based on the proportion of the hydraulic retention time of each chamber in the total hydraulic retention time and the proportion of each chamber in the total reaction tank, the first satiation hunger ratio is calculated to obtain the hydraulic retention time point corresponding to the first satiation hunger ratio, and then the chamber corresponding to the hydraulic retention time is obtained as the satiation hunger ratio critical position. When the number of chambers is divided more, the satiation hunger ratio critical position is more accurate.

[0131] Figure 5 The flowchart of a satiation hunger ratio quantitative control method provided in the embodiment of the application Figure Four In Figure 2 , Figure 3 and Figure 4 the embodiment, as shown in Figure 5 , the specific implementation steps of S202 include:

[0132] S401, regulating the sludge return ratio and the sludge concentration until the sludge return ratio meets the sludge return ratio range and the sludge concentration meets the sludge concentration range, and then keeping the regulated sludge return ratio and sludge concentration.

[0133] For example, the sludge return ratio and the sludge concentration in the anaerobic zone are regulated until the sludge return ratio is 50%-80% and the sludge concentration in the anaerobic zone is kept at 2-5g / L.

[0134] S402, gradually increase the influent chemical oxygen demand concentration, during which, record the real-time influent chemical oxygen demand concentration, and the chemical oxygen demand concentration, influent flow and activated sludge concentration of the end chamber and the front chamber at each time.

[0135] Wherein, gradually increasing the influent chemical oxygen demand concentration, the functional microorganisms are enriched.

[0136] S403, when the chemical oxygen demand concentration of the end chamber is less than the chemical oxygen demand concentration threshold, and the chemical oxygen demand concentration change value between the chemical oxygen demand concentration of the end chamber and the chemical oxygen demand concentration of the front chamber is less than the chemical oxygen demand concentration change threshold, the real-time influent chemical oxygen demand concentration at the first time is taken as the critical chemical oxygen demand concentration.

[0137] Wherein, the first time is the time before the second time.

[0138] The second time is the time when the chemical oxygen demand concentration of the end chamber is greater than or equal to the chemical oxygen demand concentration threshold, or the chemical oxygen demand concentration change value is greater than or equal to the chemical oxygen demand concentration change threshold.

[0139] For example, the chemical oxygen demand concentration of the end chamber is less than the chemical oxygen demand concentration threshold of 50mg / L; the chemical oxygen demand concentration change value between the chemical oxygen demand concentration of the end chamber and the chemical oxygen demand concentration of the front chamber is less than the chemical oxygen demand concentration change threshold of 10%.

[0140] In this embodiment, based on the regulation strategy of satiation hunger ratio critical position, by monitoring the influent chemical oxygen demand concentration in real time and setting the sludge return flow regulation strategy of satiation zone, the size of the critical microbe ratio of satiation zone is quantitatively regulated, the satiation hunger ratio of the system is regulated within the set range, which greatly improves the stability of the satiation hunger environment in the continuous flow system, and provides the possibility for the rapid cultivation of the continuous flow system AGS.

[0141] In order to make the technical solutions of the present application more clear and complete, the following will be further described in detail through specific examples. The system used in the examples of the present application is a small-scale continuous-flow aerobic granular sludge reactor for treating actual domestic sewage. The volume of the biochemical section is 660 L, and the daily treatment scale is 1.32 tons / day. The reactor comprises an anaerobic zone, an anoxic zone, an aerobic zone and a sedimentation zone. The total hydraulic retention time of the biochemical section of the system is designed to be 12 h, of which the anaerobic tank is 2 h, the anoxic tank is 3 h, and the aerobic tank is 7 h. In order to ensure the increase of the concentration gradient at the inlet and to study the influence factors and regulation strategies of satiation-hunger conditions, the anaerobic zone is divided into 27 (9*3) compartments, each with a retention time of about 4.4 min. A certain height of baffle is arranged in each compartment to realize the sufficient mixing of sludge and water through the water turbulence. The anoxic zone is divided into 6 compartments, each with a retention time of about 30 min. A stirring device is installed in each compartment.

[0142] In order to ensure the rapid enrichment of functional microorganisms (PAO, DPAO, etc.) in the initial stage, the organic load of the influent should be increased as much as possible. The first satiation-hunger ratio is set to be 0.5. According to the retention time calculation, the satiation-hunger critical position is located at the position with a retention time of 4 h, i.e. the fourth compartment of the anoxic zone.

[0143] The actual wastewater has a COD concentration of 80-120 mg / L, an ammonia nitrogen concentration of 20-35 mg / L and a total phosphorus concentration of 1.6-3 mg / L. The average concentration of the initial influent COD is regulated to be 200 mg / L by supplementing carbon sources. The sludge concentration in the anaerobic zone is 3-5 g / L, and the sludge return ratio is 50%-100%. After starting the device, the COD concentration along the way is detected every week, the satiation-hunger ratio of the system is calculated, and if the satiation-hunger ratio is greater than 0.5, the size of the sludge return ratio is increased, and if the satiation-hunger ratio is less than 0.5, the organic matter concentration of the influent is increased, until the COD concentration of the effluent in the anoxic zone is less than 40 mg / L, and the difference between the COD concentrations of the effluent in the anoxic zone and the influent in the aerobic zone is less than 6 mg / L.

[0144] The experiment is generally divided into three stages:

[0145] The first stage (0-50 days) controls the sludge concentration to be about 4 g / L by regulating the amount of sludge return through the sludge return formula, and gradually increases the influent food microorganism ratio from 0.1 kgCOD / (kgMLSS*d) to 0.2 kgCOD / (kgMLSS*d). The satiation-starvation ratio of the system is calculated according to the COD concentration before and after the critical position, and it is found that when the food microorganism ratio is about 0.18 kgCOD / (kgMLSS*d), the COD concentration at the critical position (anoxic zone chamber 4) is lower than 40 mg / L, and the difference in COD concentration between anoxic zone chamber 4 and anoxic zone chamber 5 is lower than 6 mg / L. When the food microorganism ratio continues to increase, the above conditions cannot be met, indicating that the optimal food microorganism ratio is 0.18 kgCOD / (kgMLSS*d) under the condition of a critical satiation-starvation ratio of 0.5.

[0146] The second stage (51-97 days) starts to strengthen sludge selection under the optimal food microorganism ratio of 0.18 kgCOD / (kgMLSS*d). The sludge discharge amount of poor settling performance is increased by regulating the sedimentation system, and the sludge age of the system is controlled to about 5 days. The sludge concentration gradually decreases from 4 g / L to about 2 g / L. During this process, the sludge concentration is detected every 3 days, and the influent COD concentration is regulated by the optimal food microorganism ratio, so as to maintain the stability of the system and avoid problems such as filamentous bacteria expansion caused by food microorganism ratio shock.

[0147] The third stage (98-125 days) is the stable growth stage of granular sludge. Through the sludge selection strengthening in the second stage, the sludge with good settling performance is enriched, but the sludge concentration decreases significantly, which is not conducive to the denitrification and phosphorus removal performance of the system in the long run. At this time, the influent organic load needs to be gradually increased, the sludge discharge needs to be reduced, and the sludge return amount needs to be increased to increase the sludge concentration. On the other hand, attention should be paid to the regulation of the food microorganism ratio while increasing the influent organic load. In this stage, the functional microorganisms have been enriched, and more attention should be paid to the problem of excessive satiation-starvation ratio leading to the massive reproduction of heterotrophic microorganisms and filamentous bacteria expansion. Therefore, the COD concentration along the way is detected regularly during this process, the actual satiation-starvation ratio of the system is calculated, and the actual satiation-starvation ratio of the system is adjusted to 0.3 in combination with the sludge settling performance. At the same time, the optimal food microorganism ratio is adjusted according to the method in the first stage, and the food microorganism ratio of the system is gradually reduced to about 0.15 kgCOD / (kgMLSS*d), and the sludge concentration gradually increases from 2.08 mg / L to 4.25 mg / L.

[0148] Through the above method, after running for 4 months, the system has formed obvious granular sludge. Under the experimental conditions, the average particle size of activated sludge increases from 52 um in the initial stage to 230 um.

[0149] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments, and the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for quantitative regulation of satiety hunger ratio, characterized in that, The method is applied to a continuous-flow aerobic granular sludge system, the continuous-flow aerobic granular sludge system comprising a reaction tank, the reaction tank comprising a satiation zone and a starvation zone, and the method comprising: calculating a real-time influent organic load according to a real-time influent flow rate and a real-time influent chemical oxygen demand concentration of the reaction tank; calculating an ideal satiation zone sludge concentration according to the critical micro-feed ratio and the real-time influent organic load; calculating an ideal sludge return flow rate of the satiation zone according to the real-time influent flow rate, the ideal sludge concentration of the satiation zone and a sludge return concentration; controlling the sludge return flow rate of the satiation zone until the sludge return flow rate is the same as the ideal sludge return flow rate; the reaction tank comprising a plurality of sub-zones, the plurality of sub-zones comprising: an anaerobic zone, an anoxic zone and an aerobic zone; before the calculating a real-time influent organic load according to a real-time influent flow rate and a real-time influent chemical oxygen demand concentration of the reaction tank, the method further comprising: obtaining a satiation-starvation ratio critical position according to a total hydraulic retention time and a first satiation-starvation ratio, and dividing the plurality of sub-zones into the satiation zone and the starvation zone according to the satiation-starvation ratio critical position; wherein the first satiation-starvation ratio is selected from a preset satiation-starvation ratio interval; increasing the influent chemical oxygen demand concentration, and obtaining a plurality of parameter values when a sludge return ratio of the satiation zone, a sludge concentration of the anaerobic zone, a chemical oxygen demand concentration of the satiation-starvation ratio critical position and a chemical oxygen demand concentration variation value of the satiation-starvation ratio critical position meet respective preset critical conditions; wherein the plurality of parameter values comprise: a critical chemical oxygen demand concentration, an influent flow rate, an activated sludge concentration of the anaerobic zone and a reaction tank volume of the satiation zone; calculating the critical micro-feed ratio according to the plurality of parameter values.

2. The method of claim 1, wherein, each of the sub-zones is divided into a plurality of chambers, and the total hydraulic retention time comprises a chamber hydraulic retention time of each of the chambers, wherein the total hydraulic retention time and the chamber hydraulic retention time are both time periods; the obtaining a satiation-starvation ratio critical position according to a total hydraulic retention time and a first satiation-starvation ratio comprises: obtaining a hydraulic retention time point corresponding to the first satiation-starvation ratio according to the first satiation-starvation ratio and the total hydraulic retention time; taking a chamber where the hydraulic retention time point is located as the satiation-starvation ratio critical position.

3. The method of claim 2, wherein, the preset critical conditions comprise: a sludge return ratio range of the satiation zone, a sludge concentration range of the anaerobic zone, a chemical oxygen demand concentration threshold of the satiation-starvation ratio critical position and a chemical oxygen demand concentration variation threshold of the satiation-starvation ratio critical position; the satiation-starvation ratio critical position is a terminal chamber of the satiation zone, and a chamber adjacent to the terminal chamber of the satiation zone is a front-end chamber of the starvation zone; the satiation-starvation ratio critical position is located at a terminal of a plurality of chambers of the satiation zone, and the terminal of the plurality of chambers of the satiation zone is on the same side as a front end of a plurality of chambers of the starvation zone.

4. The method of claim 3, wherein, When the sludge return ratio of the satiation zone, the sludge concentration of the anaerobic zone, the chemical oxygen demand concentration of the satiation-starvation ratio critical position, and the chemical oxygen demand concentration variation of the satiation-starvation ratio critical position meet the respective preset critical conditions, a plurality of parameter values are obtained, including: The sludge return ratio and the sludge concentration are regulated until the sludge concentration meets the sludge concentration range, and then the regulated sludge return ratio and sludge concentration are maintained; The influent chemical oxygen demand concentration is gradually increased, during which the real-time influent chemical oxygen demand concentration, the chemical oxygen demand concentrations of the end chamber and the front chamber at each time, the influent flow rate, and the activated sludge concentration are recorded; When the chemical oxygen demand concentration of the end chamber is less than the chemical oxygen demand concentration threshold, and the chemical oxygen demand concentration variation between the chemical oxygen demand concentration of the end chamber and the chemical oxygen demand concentration of the front chamber is less than the chemical oxygen demand concentration variation threshold, the real-time influent chemical oxygen demand concentration at the first time is taken as the critical chemical oxygen demand concentration; wherein the first time is the time before the second time; the second time is when the chemical oxygen demand concentration of the end chamber is greater than or equal to the chemical oxygen demand concentration threshold, or the chemical oxygen demand concentration variation is greater than or equal to the chemical oxygen demand concentration variation threshold.

5. The method of claim 4, wherein, After the sludge return flow of the satiation zone is regulated until the sludge return flow is the same as the ideal sludge return flow, the method further comprises: Periodically detecting the real-time satiation-starvation ratio, adjusting the real-time satiation-starvation ratio according to the needs of different cultivation stages of granular sludge, and updating the critical satiation-starvation ratio.

6. A continuous flow aerobic granular sludge system characterized in that, A system for performing the quantitative regulation method of the satiation-starvation ratio of claim 1, the system comprising: a reaction tank; The reaction tank comprises a plurality of partitions, which are divided into a satiation zone and a starvation zone; The plurality of partitions comprise an anaerobic zone, an anoxic zone, and an aerobic zone; One end of the anaerobic zone is on the same side as the other end of the anoxic zone, and one end of the aerobic zone is on the same side as the other end of the anaerobic zone and the other end of the anoxic zone, respectively; The method comprises: According to the real-time influent flow rate and the real-time influent chemical oxygen demand concentration of the reaction tank, the real-time influent organic load is calculated; According to the critical satiation-starvation ratio and the real-time influent organic load, the ideal sludge concentration of the satiation zone is calculated; According to the real-time influent flow rate, and the ideal sludge concentration and sludge return concentration of the satiation zone, the ideal sludge return flow of the satiation zone is calculated; Regulate the sludge return flow of the satiation zone until the sludge return flow is the same as the ideal sludge return flow; The reaction tank comprises a plurality of partitions, which comprise an anaerobic zone, an anoxic zone, and an aerobic zone; Before calculating the real-time influent organic load according to the real-time influent flow rate and the real-time influent chemical oxygen demand concentration of the reaction tank, the method further comprises: According to the total hydraulic retention time and the first satiation hunger ratio, a satiation hunger ratio critical position is obtained, and the plurality of sub-zones are divided into the satiation zone and the hunger zone according to the satiation hunger ratio critical position; wherein the first satiation hunger ratio is selected from a preset satiation hunger ratio interval; The influent chemical oxygen demand concentration is increased, and when the sludge return ratio of the satiation zone, the sludge concentration of the anaerobic zone, the chemical oxygen demand concentration of the satiation hunger ratio critical position, and the chemical oxygen demand concentration variation value of the satiation hunger ratio critical position meet respective preset critical conditions, a plurality of parameter values are obtained; wherein the plurality of parameter values include: a critical chemical oxygen demand concentration, an influent flow rate, an activated sludge concentration of the anaerobic zone, and a reaction tank volume of the satiation zone; The critical satiation hunger ratio is calculated according to the plurality of parameter values.

7. The system of claim 6, wherein, The anaerobic zone and the anoxic zone each include: a plurality of chambers, partition walls, water passing holes, and stirring devices; each of the chambers is obtained by equally dividing the anaerobic zone or the anoxic zone through the partition walls, each of the partition walls is provided with a water passing hole, and the liquid between adjacent two chambers is communicated through the water passing hole; each of the chambers of the anaerobic zone and the anoxic zone is provided with a stirring device; The aerobic zone is communicated with the anaerobic zone and the anoxic zone through the water passing holes respectively, and the aerobic zone includes: a plurality of aerobic tanks, baffling plates, microporous aeration devices, and stirring devices; each of the aerobic tanks is obtained by equally dividing the aerobic zone through the baffling plates.

8. The system of claim 7, wherein, The system further includes: a sedimentation device and a reflux device; One end of the sedimentation device is on the same side as the other end of the aerobic zone, and the sedimentation device includes: a flow guide plate, a sludge return hopper, a sludge discharge hopper, a sludge sedimentation zone, and a sludge scraping device; the flow guide plate is arranged between the top and the middle of the influent end of the sedimentation device, the sludge return hopper is arranged at the bottom of the influent end of the sedimentation device, the sludge discharge hopper is arranged at the bottom of the effluent end of the sedimentation device, and the sludge scraping device is arranged in the sludge sedimentation zone of the middle of the sedimentation device; The reflux device includes a nitrification liquid reflux device and a sludge reflux device, the nitrification liquid reflux device is connected with the effluent end of the aerobic zone and the anaerobic zone and the anoxic zone respectively, and the sludge reflux device is connected with the sludge return hopper and the influent end of the anaerobic zone respectively.

9. The system of claim 8, wherein, The dissolved oxygen concentration of the anaerobic zone should be maintained below 0.05 mg / L, the oxidation-reduction potential of the anaerobic zone should be maintained at-150 to-225 mV, the dissolved oxygen concentration of the effluent end of the aerobic zone should be maintained below 0.5 mg / L, and the concentration of the sludge return hopper of the sedimentation tank should be maintained above 12000 mg / L.

10. The system of claim 8, wherein, The system further includes an intelligent control device; The intelligent control device is signal connected with the stirring devices, and the intelligent control device is used to control the opening and closing and stirring rate of the stirring devices; The intelligent control device is signal connected with the reflux pumps of the reflux device, and the intelligent control device is used to adjust the opening and closing and reflux flow rate of the reflux pumps. The intelligent control device is signal connected with the microporous aeration device, and is used for controlling opening and closing of the microporous aeration device and aeration flow; The intelligent control device is signal connected with the online monitoring equipment of the anaerobic zone, the anoxic zone, the aerobic zone and the sedimentation device respectively.

11. The system of claim 10, wherein, The microporous aeration device and the stirring device are simultaneously installed at the effluent section of the aerobic zone, the stirring device is long-term opened, and the start and stop of the microporous aeration device at the effluent section are regulated according to signals transmitted by the online monitoring equipment of the aerobic zone.

Images