Sequencing batch reactor and application thereof

Abstract

The invention provides a sequencing batch batch reactor and application thereof, the sequencing batch batch reactor comprises an anaerobic reaction unit, an anoxic reaction unit, an aerobic unit, an anoxic and aerobic reaction unit, a sequencing batch unit and a pretreatment unit, the anaerobic reaction unit is communicated with the anoxic reaction unit and the anoxic and aerobic reaction unit; the anoxic reaction unit is communicated with the aerobic unit, the aerobic unit is communicated with the anoxic and aerobic reaction unit, the anoxic and aerobic reaction unit is communicated with the sequencing batch unit, the sequencing batch unit is communicated with the pretreatment unit, and the pretreatment unit is communicated with the anaerobic reaction unit. According to the sequencing batch reactor and the application thereof, through cooperation of the anaerobic reaction unit, the anoxic reaction unit, the aerobic unit, the anoxic and aerobic reaction unit, the sequencing batch unit and the pretreatment unit, the sewage treatment capacity of the sequencing batch reactor is improved, the effluent standard is improved, and meanwhile energy consumption and medicine consumption are effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sequencing batch reactor and an application thereof. Background Art

[0002] Sequencing batch reactors have been widely used in China and North America. For example, a one-tank, seven-chamber improved sequencing batch reactor includes an anaerobic reaction unit, a separation unit, a pre-anoxic unit, an anoxic unit, an aerobic unit and two sequencing batch units. In each half of the operation cycle, one of the sequencing batch units precipitates the effluent, while the other sequencing batch unit conducts multi-stage sewage circulation treatment with other units to remove phosphorus and nitrogen.

[0003] However, as the effluent standards of sewage treatment plants become increasingly stringent, the negative impact of low-temperature sewage in winter on the treatment effect and operational stability of the activated sludge process in sewage treatment plants in northern regions, as well as the common low influent concentration and low influent C / N ratio in sewage treatment plants in southern regions, resulting in effluent that cannot stably meet the standards, are becoming increasingly prominent. It often requires extremely high construction investment and operating costs to barely meet emission standards. Summary of the invention

[0004] The purpose of the present invention is to propose a sequencing batch reactor and its application, to improve the sewage discharge effluent standard, to reduce energy consumption and drug consumption, and to enhance the composite capacity and operation flexibility of the reactor.

[0005] To this end, in a first aspect, the present invention provides a sequencing batch reactor, comprising: An anaerobic reaction unit, an anoxic reaction unit, an aerobic unit, an anoxic reaction unit, a sequencing batch unit and a pretreatment unit, wherein the anaerobic reaction unit is connected to the anoxic reaction unit and the anoxic reaction unit, the anoxic reaction unit is connected to the aerobic unit, the aerobic unit is connected to the anoxic reaction unit, the anoxic reaction unit is connected to the sequencing batch unit, the sequencing batch unit is connected to the pretreatment unit, and the pretreatment unit is connected to the anaerobic reaction unit.

[0006] Preferably, the anoxic reaction unit and the sequencing batch unit are provided in multiple groups, and intermittent reactions are carried out in sequence.

[0007] More preferably, there are a plurality of anoxic reaction units, wherein there are two anoxic reaction units, one of which is provided with an external carbon source receiving device.

[0008] Preferably, the pretreatment unit comprises a pre-anoxic unit and a mud-water separation unit, the sequencing batch unit is connected to the mud-water separation unit, the mud-water separation unit is connected to the pre-anoxic unit, and the pre-anoxic unit is connected to the anaerobic reaction unit.

[0009] Preferably, it further comprises a water inlet distribution device, wherein the water inlet distribution device is connected with the anaerobic reaction unit and the aerobic unit, and the water inlet distribution unit is used to transport raw water to the anaerobic reaction unit and the aerobic unit.

[0010] Preferably, it further comprises a control device, wherein the control device is connected with the anaerobic reaction unit, the anoxic reaction unit, the aerobic unit, the anoxic reaction unit, the sequencing batch unit and the pretreatment unit.

[0011] Preferably, the sequencing batch unit is provided with a sludge enhanced return device for returning the precipitated sludge to the mud-water separation unit and the anaerobic reaction unit; the sequencing batch unit is provided with a discharge device for discharging the sludge to the outside.

[0012] Preferably, a plurality of hydraulic guide walls are provided in the aerobic unit. Preferably, a hydraulic retaining wall is arranged in the middle of the sequencing batch unit, the top of the hydraulic retaining wall is arranged obliquely, and a balancing hole is arranged at the bottom of the hydraulic retaining wall.

[0013] In a second aspect, an application method of a sequencing batch reactor is provided, wherein the sequencing batch reactor is used for raw water treatment of organic matter and nitrogen and phosphorus.

[0014] In a third aspect, another application method of a sequencing batch reactor is provided, wherein the sequencing batch reactor is used for treating excess combined sewer overflow sewage containing a large amount of suspended solids.

[0015] Beneficial effects: (1) The present disclosure provides a sequencing batch reactor and its application. By coordinating an anaerobic reaction unit, an anoxic reaction unit, an aerobic unit, an anoxic reaction unit, a sequencing batch unit and a pretreatment unit, the sewage treatment capacity of the sequencing batch reactor is improved, the effluent standard is improved, and the energy consumption and drug consumption are effectively reduced.

[0016] (2) The present invention improves the reactor's ability to resist shock loads and operational flexibility through the coordination of an inlet distribution device, a control device, and a sludge enhanced return device, and can take into account both dry and rainy season sewage treatment, effectively reducing the investment and operating costs of sewage treatment plants in combined sewer overflow treatment, while significantly improving the treatment capacity and effluent quality of sewage treatment plants in the rainy season.

[0017] (3) The sequencing batch reactor disclosed in the present invention can effectively treat raw water containing organic matter, nitrogen and phosphorus, and excess combined sewer overflow sewage containing a large amount of suspended solids, and ensure the effect of sewage treatment through different usage methods.

[0018] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of a sequencing batch reactor in the present disclosure, and the flow direction of raw water, treated liquid or bottom mud in a dry season mode; Figure 2 A flow diagram of a first sequencing batch unit of an embodiment of a sequencing batch reactor in the present disclosure, wherein completely closed pipelines are omitted; Figure 3 A flow diagram of a second sequencing batch unit of an embodiment of a sequencing batch reactor in the present disclosure, wherein completely closed pipelines are omitted; Figure 4 It is a schematic diagram of the structure of an embodiment of a sequencing batch reactor in the present disclosure, and the flow direction of raw water, treated liquid or bottom mud under heavy rain and large water volume in the rainy season mode; Figure 5 This is a flow diagram of a first sequencing batch unit and a second sequencing batch unit operating simultaneously in an embodiment of a sequencing batch reactor in the present disclosure, wherein completely closed pipelines are omitted.

[0021] Figure 6 An online instrumentation diagram of an embodiment of a sequencing batch reactor in the present disclosure.

[0022] Figure 7 The present invention is a method flow chart of an application method of a sequencing batch reactor in the present invention.

[0023] Figure 8 The present invention is a process flow chart of another application method of a sequencing batch reactor in the present invention.

[0024] In the figure, 1-first batch unit, 2-mud-water separation unit, 3-pre-anoxic unit, 4-anaerobic reaction unit, 5A-first anoxic reaction unit, 5B-second anoxic reaction unit, 6-aerobic unit, 7-second batch unit, 8A-first anoxic reaction unit, 8B-third anoxic reaction unit, 9A-second anoxic reaction unit, 9B-fourth anoxic reaction unit. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] The terms "first", "second", "third", "fourth", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances. For example, without departing from the scope of this document, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0027] The word "if" as used herein may be interpreted as "when" or "when" or "in response to determining," depending on the context.

[0028] Furthermore, as used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context indicates otherwise.

[0029] It should be further understood that the terms “comprises” and “includes” indicate the existence of features, steps, operations, elements, components, items, types, and / or groups, but do not exclude the existence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups.

[0030] The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". An exception to this definition will only occur when a combination of elements, functions, steps or operations are inherently mutually exclusive in some manner.

[0031] In a first aspect, an embodiment of the present disclosure provides a sequencing batch reactor, comprising: The anaerobic reaction unit 4, the anoxic reaction unit, the aerobic unit 6, the anoxic reaction unit, the sequencing batch unit and the pretreatment unit, the anaerobic reaction unit 4 is connected with the anoxic reaction unit and the anoxic reaction unit, the anoxic reaction unit is connected with the aerobic unit 6, the aerobic unit 6 is connected with the anoxic reaction unit, the anoxic reaction unit is connected with the sequencing batch unit, the pretreatment unit includes a pre-anoxic unit 3 and a mud-water separation unit 2, the sequencing batch unit is connected with the mud-water separation unit 2, the mud-water separation unit 2 is connected with the pre-anoxic unit 3, and the pre-anoxic unit 3 is connected with the anaerobic reaction unit 4.

[0032] There are multiple groups of anoxic reaction units and batch units, which perform intermittent reactions in sequence. There are multiple anoxic reaction units. Among them, there are two anoxic reaction units, one of which is equipped with an external carbon source receiving device. In one embodiment, there are two groups of anoxic reaction units and batch units, each of which is equipped with two anoxic reaction units and one batch unit, namely, the first anoxic reaction unit 8A, the second anoxic reaction unit 9A, the third anoxic reaction unit 8B and the fourth anoxic reaction unit 9B, the first batch unit 1 and the second batch unit 7, wherein the aerobic unit 6 is connected to the first anoxic reaction unit 8A and the second anoxic reaction unit 9A, the first anoxic reaction unit 8A is connected to the third anoxic reaction unit 8B, the third anoxic reaction unit 8B is connected to the first batch unit 1, the second anoxic reaction unit 9A is connected to the fourth anoxic reaction unit 9B, and the fourth anoxic reaction unit 9B is connected to the second batch unit 7.

[0033] There are multiple anoxic reaction units. In one embodiment, there are two anoxic reaction units, namely, a first anoxic reaction unit 5A and a second anoxic reaction unit 5B, the anaerobic reaction unit 4 is connected to the first anoxic reaction unit 5A, the first anoxic reaction unit 5A is connected to the second anoxic reaction unit 5B, the second anoxic reaction unit 5B is connected to the aerobic unit 6, and the aerobic unit 6 is connected to the first anoxic reaction unit 5A.

[0034] The anaerobic reaction unit 4 is used to generate anaerobic conditions to treat the liquid. The anaerobic reaction unit 4 can receive all or part of the raw water, the sludge from the pre-anoxic unit 3 and the sedimentation sludge from the first batch unit 1 and the second batch unit 7 .

[0035] The first anoxic reaction unit 5A is used to generate anoxic conditions to treat the liquid. The first anoxic reaction unit 5A can receive the treated liquid from the anaerobic reaction unit 4 and the treated liquid from the aerobic unit 6. The first anoxic reaction unit 5A can receive the treated liquid from the aerobic unit 6 to ensure sufficient nitrate reflux and maintain a long reaction residence time, thereby enhancing the denitrification effect of the system.

[0036] The second anoxic reaction unit 5B is used to generate anoxic conditions to treat the liquid. The second anoxic reaction unit 5B can receive the treated liquid from the first anoxic reaction unit 5A.

[0037] The aerobic unit 6 is used to generate aeration conditions to treat the liquid. The aerobic unit 6 can receive the treated liquid from the second anoxic reaction unit 5B and a portion of the raw water.

[0038] The first anoxic reaction unit 8A is used to produce anoxic conditions or aerobic conditions to treat the liquid. The first anoxic reaction unit 8A can receive the treated liquid from the aerobic unit 6 .

[0039] The second anoxic reaction unit 9A is used to produce anoxic conditions or aerobic conditions to treat the liquid. The second anoxic reaction unit 9A can receive the treated liquid from the aerobic unit 6 .

[0040] The third anoxic reaction unit 8B is used to produce anoxic conditions or aerobic conditions to treat the liquid. The third anoxic reaction unit 8B can receive the treated liquid from the first anoxic reaction unit 8A.

[0041] The fourth anoxic reaction unit 9B is used to produce anoxic conditions or aerobic conditions to treat the liquid. The fourth anoxic reaction unit 9B can receive the treated liquid from the second anoxic reaction unit 9A.

[0042] In the present embodiment, the unit refers to a chamber, a pool (i.e., an open pool) or a housing that can independently complete the corresponding function. For example, the anoxic condition refers to not contacting the additional air except the atmosphere, such as not aerating, so that the content liquid of the unit to which it belongs performs anoxic reaction therein, including the denitrification reaction of nitrate radical by facultative bacteria (e.g., denitrifying bacteria), and the reaction of phosphate radical absorption by phosphorus-rich bacteria (e.g., acinetobacter and aeromonas) and release of fatty acids. The anoxic reaction unit can be a pool without aeration function, preferably a substantially airtight chamber or housing. The anaerobic reaction unit 4 can have a substantially identical structure with the anoxic reaction unit, except that in addition to having the function of not contacting the additional air except the atmosphere (e.g., not aerating), the inflow of the treatment solution containing nitrate radical is also avoided to the greatest extent possible. For another example, the aerobic unit 6 is a chamber, a pool or a box with a function of introducing additional air or oxygen (usually with an aeration function), so that the content liquid can undergo aerobic reactions therein, including nitrification reactions by nitrifying bacteria (such as Nitrosomonas and Nitrobacter), and a larger absorption reaction of phosphate radicals by phosphorus-rich bacteria.

[0043] Microorganisms involved in anoxic and aerobic reactions usually exist in the sludge of sewage and gradually increase and stabilize as the anoxic and aerobic environments are maintained, which is sufficient to complete the anoxic and aerobic reactions of the corresponding units, and generally no additional microorganisms need to be added. In this article, the exemplary operation of the low-carbon, high-efficiency, multi-mode, multi-unit improved sequencing batch reactor refers to the operation when its microorganisms react stably, rather than the extreme case of insufficient microorganisms in the initial stage of equipment investment.

[0044] The first batch unit 1 is used to react or precipitate the liquid under anoxic, aerated or static conditions. The first batch unit 1 can receive the supernatant of the mud-water separation unit 2 and the treated liquid of the third anoxic reaction unit 8B.

[0045] The second batch unit 7 is used to make the liquid react or precipitate water under anoxic or aerated or static conditions. The second batch unit 7 can receive the supernatant of the mud-water separation unit 2 and the treated liquid of the fourth anoxic reaction unit 9B.

[0046] In one embodiment, the sequencing batch unit refers to a chamber, pool or box that can perform different reactions (e.g., anoxic reaction and aerobic reaction) in different time periods, preferably a substantially closed chamber or box with a stirring and aeration device, aeration is performed during aerobic reaction, aeration is stopped and stirring is started during anoxic reaction. The anoxic unit is preferably a substantially closed chamber, pool or box that is substantially similar to the sequencing batch unit and has a stirring and aeration device, and can perform different reactions (e.g., anoxic reaction and aerobic reaction) in different time periods, but can also be a unit that can only perform a single function of one of the anoxic (reaction) unit and the aerobic (reaction) unit. For example, the anoxic unit only serves as an anoxic (reaction) unit, which does not have an aeration function, and the use of diverted raw water or external carbon source is sufficient to achieve effective denitrification treatment of sewage with a low carbon-nitrogen ratio; for another example, the anoxic unit only plays the function of an aerobic (reaction) unit, then it can be regarded as a derivative or expansion of the aerobic unit, and in practice it can more efficiently replace the existing one-tank and multi-chamber improved sequencing batch reactor, which is sufficient to achieve effective treatment of sewage with a high carbon-nitrogen ratio or excess combined sewer overflow sewage.

[0047] The mud-water separation unit 2 is used to separate the supernatant and the sludge from the treated liquid and / or the precipitated sludge. The mud-water separation unit 2 can receive the treated liquid and / or the precipitated sludge of the first batch unit 1 and the second batch unit 7. In one embodiment, the mud-water separation unit 2 is also called a separation unit, which usually separates the sludge and the supernatant by gravity. The sludge can be transported to the pre-anoxic unit 3 through a pipeline or a pipe mouth. In the present invention, the function of the mud-water separation unit 2 is utilized, and the sludge with poor settling performance in the system is discharged with the supernatant, and the sludge with good settling performance is retained and concentrated and refluxed, thereby achieving the purpose of optimizing the screening of sludge strains in the biochemical system.

[0048] The pre-anoxic unit 3 is used to make the sludge react under anoxic conditions and transport the sludge to the anaerobic reaction unit 4. The pre-anoxic unit 3 can receive the sludge from the mud-water separation unit 2. In one embodiment, the pre-anoxic unit 3 receives the sludge from the mud-water separation unit 2 and can make the sludge undergo enrichment and denitrification reaction under anoxic conditions, ensuring that the anaerobic reaction unit 4 has a lower nitrate concentration and sufficient sludge concentration, increasing the actual hydraulic retention time, reducing the dilution of the raw water carbon source, increasing the reactant concentration, and providing the best hydrolysis acidification and anaerobic phosphorus release conditions, creating conditions for the subsequent excessive phosphorus absorption in the anoxic reaction unit and the aerobic unit 6.

[0049] In one embodiment, receiving liquid or slurry can be achieved through a pipeline or a nozzle. Among them, the pipeline is usually used for transportation between two separated units, and the nozzle is used for transportation between two adjacent units (i.e., sharing a common plate wall). Valves can be set on the pipeline and the nozzle to control opening and closing and flow regulation. A pump can be set on the pipeline to lift the liquid or slurry, or to increase the speed and flow of transportation. The pump can preferably be adjustable in power, such as with a frequency converter, so that the flow can be adjusted.

[0050] In one embodiment, raw water refers to sewage containing organic matter in a narrow sense (e.g., urban domestic sewage), that is, sewage that has been preliminarily clarified or filtered to avoid extremely high mixed suspended solids concentration (MLSS). The typical concentration of MLSS of raw water is 2000-4500 mg / L, preferably 2500-3500 mg / L, and more preferably 3000-4000 mg / L. Except for the pre-anoxic unit 3 and the mud-water separation unit 2, the typical concentration of the treatment liquid in each unit of the sequencing batch reactor in this embodiment is usually 2000-4500 mg / L, preferably 2500-3500 mg / L, and more preferably 3000-4000 mg / L.

[0051] It is worth noting that the first, second, third and fourth are only used to distinguish units with the same or similar structures or functions, rather than to limit the structures or functions of the corresponding units themselves. For example, in the present invention, two anoxic reaction units are arranged in series, namely the first anoxic reaction unit 5A and the second anoxic reaction unit 5B, which can have the same structure and both have the function of implementing anoxic reaction of the content liquid. For sewage with a low carbon-nitrogen ratio, it is necessary to arrange two anoxic reaction units in series after the anaerobic reaction unit 4 in the sequencing batch reactor. The more organic carbon in the raw water that is only consumed by the anaerobic reaction unit 4 and the refluxed high-concentration nitrate-containing treatment liquid are denitrified in the first anoxic reaction unit 5A, which can maintain a high reaction rate. After that, the relatively small amount of organic carbon received and the sub-highest concentration of nitrate received and / or distributed are denitrified in the second anoxic reaction unit 5B, and the reaction rate is relatively low. Therefore, the two anoxic reaction units in series can not only slow down the short-circuit phenomenon in the reaction tank, but also make full use of the limited organic carbon source in the raw water, reduce its oxidation and degradation in the aerobic unit 6, and improve the efficiency of the denitrification reaction. At the same time, the sludge after sufficient hydrolysis, acidification and anaerobic phosphorus release enters the secondary series anoxic reaction unit, which can ensure that the rich internal carbon source storage PHA (including PHB and PHV) in the denitrifying polyphosphate bacteria is almost all used as internal carbon source substances to achieve excessive phosphorus absorption in the anoxic reaction unit, and remove nitrogen and phosphorus in the sewage at the same time under anoxic conditions, realizing "one carbon dual use"; effectively saving carbon source and aeration energy consumption, while greatly reducing the output of residual sludge.

[0052] Among them, the anaerobic reaction unit 4, the first anoxic reaction unit 5A, the second anoxic reaction unit 5B, the first batch unit 1, the second batch unit 7, the pre-anoxic unit 3, the first anoxic reaction unit 8A and the second anoxic reaction unit 9A, the third anoxic unit 8B and the fourth anoxic unit 9B are equipped with a stirring device for stirring the treated liquid; although the anaerobic / anoxic reaction can also be carried out in a static state, in the present invention, the unit that can implement the anaerobic / anoxic reaction function is preferably equipped with a stirring device to improve the corresponding reaction efficiency.

[0053] The aerobic unit 6, the first batch unit 1, the second batch unit 7, the first anoxic reaction unit 8A, the second anoxic reaction unit 9A, the third anoxic reaction unit 8B and the fourth anoxic reaction unit 9B are provided with an aeration device for providing oxygen to achieve aeration conditions.

[0054] It also includes a control device, which is connected to the anaerobic reaction unit 4, the anoxic reaction unit, the aerobic unit 6, the first anoxic reaction unit 8A, the third anoxic reaction unit 8B, the first batch unit 1, the second anoxic reaction unit 9A, the fourth anoxic reaction unit 9B, the second batch unit 7, the mud-water separation unit 2 and the pre-anoxic unit 3.

[0055] It also includes a water inlet distribution device, which is connected to the anaerobic reaction unit 4 and the aerobic unit 6. The water inlet distribution device is used to transport raw water to the anaerobic reaction unit 4 and the aerobic unit 6. In one embodiment, the water inlet distribution device transports raw water to the anaerobic reaction unit 4 and the aerobic unit 6 through three pipelines. The bottom of the anaerobic reaction unit 4 is provided with a water inlet, and both sides of the aerobic unit 6 are provided with a water inlet. Raw water is transported to the anaerobic reaction unit 4 and / or the aerobic unit 6 through the water inlets. A flow meter and a valve are provided on the pipeline of the water inlet distribution device to control the flow of raw water transported to the anaerobic reaction unit 4 and the aerobic unit 6. The flow meter and the valve are controlled by the control device to intelligently adjust the flow.

[0056] The aerobic unit 6, the first batch unit 1 and / or the second batch unit 7 are provided with a dissolved oxygen detection sensor, which is electrically connected to the control device and is used to detect the dissolved oxygen in the aerobic unit 6, the first batch unit 1 and / or the second batch unit 7. According to the detected dissolved oxygen values ​​in the aerobic unit 6, the first batch unit 1 and the second batch unit 7, the air supply of the aeration device in the aerobic unit 6, the first batch unit 1 and the second batch unit 7 is adjusted.

[0057] A plurality of hydraulic guide walls are provided in the aerobic unit 6 . The pre-anoxic unit 3 and / or the anaerobic reaction unit 4 is provided with a redox potential meter, which is electrically connected to the control device and is used to detect the redox potential or nitrate content in the pre-anoxic unit 3 and / or the anaerobic reaction unit 4, so as to regulate the amount of sludge transported from the pre-anoxic unit 3 to the anaerobic reaction unit 4.

[0058] The first anoxic reaction unit 5A and / or the second anoxic reaction unit 5B is provided with an oxidation-reduction potential meter, which is electrically connected to the control device and is used to detect the oxidation-reduction potential or nitrate content in the first anoxic reaction unit 5A and / or the second anoxic reaction unit 5B, thereby regulating the flow rate of the treatment liquid transported by the aerobic unit 6 to the first anoxic reaction unit 5A and / or the second anoxic reaction unit 5B.

[0059] The first anoxic reaction unit 8A and / or the second anoxic reaction unit 9A is provided with an ammonia nitrogen detector, which is electrically connected to the control device and is used to detect the ammonia nitrogen detection value in the first anoxic reaction unit 8A and / or the second anoxic reaction unit 9A, thereby controlling the treatment liquid to react under anoxic conditions or under aerated conditions.

[0060] The third anoxic reaction unit 8B and / or the fourth anoxic reaction unit 9B are provided with a carbon source receiving device and an ammonia nitrogen detector, which are electrically connected to the control device, and are used to control the carbon source received from the outside, and detect the ammonia nitrogen detection value in the third anoxic reaction unit 8B and / or the fourth anoxic reaction unit 9B, so as to control the treatment liquid to react under anoxic conditions or react under aeration conditions. Although any unit capable of implementing the anaerobic / anoxic reaction function can accept an additional carbon source, it has been found through testing that the third anoxic reaction unit 8B and / or the fourth anoxic reaction unit 9B provided in the reactor are more beneficial in terms of anaerobicity.

[0061] The first batch unit 1 and / or the second batch unit 7 are provided with a sludge enhancement return device, which is electrically connected to the control device and is used to return the precipitated sludge to the mud-water separation unit 2 and the anaerobic reaction unit 4; the batch unit is provided with a sludge enhancement return device for returning the precipitated sludge to the mud-water separation unit 2 and the anaerobic reaction unit 4, such as a pipeline or a pipe mouth with a sludge pump, which can return the high-concentration sludge at the bottom of the batch unit to the front end of the system, provide sufficient sludge concentration, and avoid excessive sedimentation of the sludge in the batch unit. The sludge pump can be set in front of the hydraulic retaining wall of the batch unit to return the precipitated sludge to the mud-water separation unit 2 for secondary screening of the sludge. The sludge pumps in the sludge enhancement return device can be started in turn to ensure the delivery of high-concentration precipitated sludge and reduce interference with the hydraulic flow state of the batch unit.

[0062] The first batch unit 1 and / or the second batch unit 7 is provided with a discharge device, which is electrically connected to the control device and is used to discharge the sludge to the outside, such as a pipeline or a pipe outlet with a sludge pump, to avoid excessive aging of the sludge.

[0063] A hydraulic retaining wall is arranged in the middle of the first batch unit 1 and / or the second batch unit 7, the top of the hydraulic retaining wall is arranged obliquely, and a balancing hole is arranged at the bottom of the hydraulic retaining wall. When the water is precipitated, the batch unit can be provided with a decanter for discharging water, but it is preferred to provide an air outlet weir for discharging water. For example, a hydraulic retaining wall is arranged in the middle of the bottom of the batch unit, and the top slope of the retaining wall is designed to be inclined at about 45°, so that when the water is precipitated, the water is filtered and clarified through the bottom mud and then discharged through the air outlet weir arranged at the top, thereby further improving the water quality. When treating raw water containing organic matter and nitrogen and phosphorus, when one batch unit is precipitating water, the other batch unit reacts under anoxic, aerated and static conditions in turn, wherein the anoxic reaction is carried out when the stirring device is turned on but the aeration device is not turned on, the aeration reaction is carried out when the aeration device is turned on, and the static reaction is carried out when the stirring device and the aeration device are turned off. When treating excess combined sewer overflow sewage containing a large amount of suspended matter, two batch units can precipitate water at the same time. The mud-water separation unit 2 is connected to the batch unit through a pipeline with a pump, preferably connected to the bottom or lower part of the batch unit, to receive the treatment liquid and / or the precipitated sludge from the batch unit. Usually, during the anoxic and aerated period, the treatment liquid is received, while during the static and precipitated water period, the precipitated sludge is received, and the sludge content is much higher than that of the treatment liquid, so as to recover the microorganisms therein.

[0064] In one embodiment, the sequencing batch reactor is preferably an integrated single-tank structure, such as a one-tank twelve-unit structure. The preferred distribution structure of each unit is as follows: Figure 4 As shown. One end of the preferred single box is divided into three rows, wherein the middle includes the pre-anoxic unit 3, the mud-water separation unit 2, the anaerobic reaction unit 4, the first anoxic reaction unit 5A and the second anoxic reaction unit 5B in sequence; one side of the middle includes the first batch unit 1, the third anoxic reaction unit 8B and the first anoxic reaction unit 8A in sequence; and the other side includes the second batch unit 7, the fourth anoxic reaction unit 9B and the second anoxic reaction unit 9A in sequence; and the other end is provided with an aerobic unit 6, which is adjacent to the first anoxic reaction unit 8A, the second anoxic reaction unit 5B and the second anoxic reaction unit 9A. Adjacent units are preferably adjacent, such as sharing a board wall, and if communication is required, the adjacent units can be connected through the pipe openings on the shared board wall. Figure 5 The flow direction of two batch units and other units running simultaneously is shown, and the completely closed pipelines are omitted. Since the reaction and residence time of a certain unit can be extended by raw water / treated liquid to make up for the lack of its volume, there is little research on the volume of each unit in the prior art. Through research, it is found that for low-temperature sewage in winter and sewage with a low carbon-nitrogen ratio, the volumes of the pre-anoxic unit 3, the mud-water separation unit 2, the anaerobic reaction unit 4, the first anoxic reaction unit 5A, the second anoxic reaction unit 5B, the aerobic unit 6, the first sequencing batch unit 1, the first anoxic reaction unit 8A, the third anoxic reaction unit 8B, the second sequencing batch unit 7, the second anoxic reaction unit 8B, and the fourth anoxic reaction unit 9B in the low-carbon, high-efficiency, multi-mode, multi-unit improved sequencing batch intermittent reactor of the first aspect of the present invention are preferably small, small, medium, medium, medium, maximum, large, medium, medium, large and medium, medium, respectively. Such a volume ratio can maximize efficient biological treatment. For the sake of clarity, the volume ratio of the quantitative pre-anoxic unit 3, the mud-water separation unit 2, the anaerobic reaction unit 4, the first anoxic reaction unit 5A, the second anoxic reaction unit 5B, the aerobic unit 6, the first sequence batch unit 1, the first anoxic reaction unit 8A, the third anoxic reaction unit 8B, the second sequence batch unit 7, the second anoxic reaction unit 9A and the fourth anoxic reaction unit 9B can be 0.2-0.8: 0.2-0.8: 0.5-1.5: 0.5-1.5: 0.5-1.5: 2-8: 1.5-4.5: 0.5-1.5: 0.5-1.5: 1.5-4.5: 0.5-1.5: 0.5-1.5, preferably 0.3-0.7: 0.3-0.7: 0.8-1.2: 0.8-1.2: 0.8-1.2: 3-7: 2.5-3.5: 0.8-1.2: 0.8-1.2: 2.5-3.5: 0.8-1.2: 0.8-1.2, more preferably 0.4-0.6: 0.4-0.6: 0.9-1.1: 0.9-1.1: 0.9-1.1: 4-6: 2.8-3.2: 0.9-1.1: 0.9-1.1: 2.8-3.2: 0.9-1.1: 0.9-1.1. The above volume ratio can be adjusted according to the actual treatment requirements and the quality of the influent water.

[0065] The following is a description using specific examples, in which the materials and components are all commercially available.

[0066] Embodiment 1: Example 1 A twelve-unit sequential batch reactor in a single-box form. Figure 1-3 As shown, each unit is a chamber structure, and the pipelines and nozzles between them are connected in the form of Figure 1 shown.

[0067] The single box body includes a pre-anoxic unit 3, a mud-water separation unit 2, an anaerobic reaction unit 4, a first anoxic reaction unit 5A and a second anoxic reaction unit 5B in sequence, wherein the bottom of the mud-water separation unit 2 is inclined toward the pre-anoxic unit 3 and connected, so that the bottom mud in the mud-water separation unit 2 is deposited and enriched in the pre-anoxic unit 3; the anaerobic reaction unit 4 is connected to an external pipeline that can pass raw water, and the anaerobic reaction unit 4 and the first anoxic reaction unit 5A are connected through a pipe opening on a common plate wall; the first anoxic reaction unit 5A and the second anoxic reaction unit 5B are connected through a pipe opening on a common plate wall; The mud-water separation unit 2 and the anaerobic reaction unit 4 are connected through a pipe opening on a common plate wall; although they have a common plate wall, they are not connected; the pre-anoxic unit 3 is connected to the anaerobic reaction unit 4 through a pipeline with a sludge pump, so as to transport the concentrated sludge in the pre-anoxic unit 3 to the anaerobic reaction unit 4; the pre-anoxic unit 3, the anaerobic reaction unit 4, the first anoxic reaction unit 5A and the second anoxic reaction unit 5B are not arranged in an open form, and a stirring device is provided therein to fully mix the content liquid to facilitate the anaerobic or anoxic reaction.

[0068] One side of the single box includes the first batch unit 1, the first anoxic reaction unit 8A and the third anoxic reaction unit 8B in sequence, wherein the first batch unit 1 and the third anoxic reaction unit 8B are connected through a pipe opening on a common plate wall; the first batch unit 1 is provided with an air outlet weir, the outlet of which is equipped with a pipeline connected to the outside of the single box so as to discharge the treated qualified water, and it is also connected to the outside of the single box through a pipeline with a sludge pump so as to discharge when there is too much sediment at the bottom; the first anoxic reaction unit 8A is connected to the external pipeline on the anaerobic reaction unit 4 or its vicinity through a pipeline optionally with a pump so as to receive the diverted raw water; the third anoxic reaction unit 8 B also has an openable and closable skylight, which is convenient for observation and sampling, and can also be used to add carbon sources and other reagents when necessary through an optional pipeline with a pump; the first batch unit 1, the first anoxic reaction unit 8A and the third anoxic reaction unit 8B are not arranged in an open form, and are all provided with a stirring device and an aeration device, so that the following operations can be performed: the anoxic reaction state with the stirring device turned on but the aeration device not turned on, the aerobic reaction state with the aeration device turned on, and the static reaction or precipitation water state with the stirring device and the aeration device turned off; for raw water with a low carbon-nitrogen ratio, the first anoxic reaction unit 8A and the third anoxic reaction unit 8B only need to maintain the anoxic reaction state.

[0069] The other side of the single box symmetrically includes the second batch unit 7, the second anoxic reaction unit 9A and the fourth anoxic reaction unit 9B in sequence, and their structures are respectively the same as the first batch unit 1, the first anoxic reaction unit 8A and the third anoxic reaction unit 8B.

[0070] The aerobic unit 6, which shares a plate wall with the first anoxic reaction unit 8A, the second anoxic reaction unit 5B and the second anoxic reaction unit 9A at one end, is respectively connected to the first anoxic reaction unit 8A, the second anoxic reaction unit 5B and the second anoxic reaction unit 9A through the pipe openings on the shared plate walls; the aerobic unit 6 is preferably connected to the first anoxic reaction unit 5A through a pipeline with a pump (not shown in the figure), so that the treated water with higher nitrate in the aerobic unit 6 is transported to the first anoxic reaction unit 5A, and then flows into the second anoxic reaction unit 5B, so as to provide nitrate for the anoxic unit for denitrification, and promote the phosphorus adsorption of polyphosphate bacteria in the anoxic unit, which is beneficial for the dephosphorization of sewage with higher phosphorus content. The aerobic unit 6 is connected to an external pipeline that can be fed with raw water, and part of the raw water can be fed when treating excess combined system overflow sewage. A number of hydraulic diversion walls are provided in the middle of the aerobic unit 6 to slow down the short-circuit phenomenon in the reaction tank and increase the reaction rate.

[0071] The aerobic unit 6 and the mud-water separation unit 2 can be arranged in an open form, but are preferably not arranged in an open form; the mud-water separation unit 2 is connected to the first batch unit 1 and the second batch unit 7 through a pipeline with a pump, preferably connected to the bottom or lower part of the first batch unit 1 and the second batch unit 7, so as to receive the treatment liquid and / or precipitated sludge from the first batch unit 1 and the second batch unit 7 respectively, and the treatment liquid and the precipitated sludge are separated into sludge and supernatant by gravity in the mud-water separation unit 2; the top of the mud-water separation unit 2 is higher than the other units, and the mud-water separation unit 2 is connected to the first batch unit 1 and the second batch unit 7 through a pipeline, preferably a pipeline extending from the top or upper part thereof, which may not be equipped with a pump but with a valve to transport the supernatant to the batch unit that is reacting under anoxic or aerated or static conditions.

[0072] The approximate volume ratio of the pre-anoxic unit 3, the mud-water separation unit 2, the anaerobic reaction unit 4, the first anoxic reaction unit 5A, the second anoxic reaction unit 5B, the aerobic unit 6, the first batch unit 1, the first anoxic reaction unit 8A, the third anoxic reaction unit 8B, the second batch unit 7, the second anoxic reaction unit 9A and the fourth anoxic reaction unit 9B is 0.5:0.5:1:1:1:5:3:1:1:3:1:1.

[0073] Each pipeline and pipe mouth can be provided with a valve to control opening and closing and flow rate; each pump such as a sludge pump can be of adjustable power, such as with a frequency converter, so as to adjust the flow rate; each unit can be provided with an online monitoring instrument, such as using an oxidation-reduction potential meter to detect nitrate concentration, etc., especially adjusting the flow rate through each pump and / or valve, especially controlling the nitrate nitrogen in the pre-anoxic unit 3 to be 0.5-1.5 mg / L; using a dissolved oxygen meter to detect the dissolved oxygen concentration, and adjusting the gas supply of the aerobic unit 6, the first batch unit 1 and the second batch unit 7 through valves, etc. The distribution of the main online instruments is as follows: Figure 6 shown.

[0074] Embodiment 2: The single box of Example 2 is 88.7 meters long, 44.4 meters wide, 6 meters high, and has a daily (24-hour) flow rate (processing capacity) of 25,000 m 3 , in the southwest region, it treats sewage with a low carbon-nitrogen ratio (about 25~50% lower than conventional urban sewage), where the BOD5 / TN is 2.45. It uses a twelve-unit sequencing batch reactor and an appropriate amount of additional carbon source to ensure that the effluent water quality meets the local high emission standards.

[0075] The water quality of the sewage before and after the above treatment is shown in the table below. The results show that the twelve-unit sequencing batch reactor of the present invention can effectively treat sewage with a low carbon-nitrogen ratio and is an ideal sewage biological phosphorus and nitrogen removal equipment that meets the current local high emission standards.

[0076]

[0077] Embodiment 3: The single box of Example 3 is 91 meters long, 82 meters wide, and 8 meters high, with a daily (24-hour) flow rate (processing capacity) of 50,000 m 3 , in Yunnan Province, it treats sewage with a low carbon-nitrogen ratio (about 50~100% lower than conventional urban sewage), where the BOD5 / TN is 1.8. By adding an appropriate amount of additional carbon source, the effluent water quality can stably meet the local high emission standards.

[0078] The water quality of the sewage before and after the above treatment is shown in the table below. The results show that the twelve-unit sequencing batch reactor of the present invention can effectively treat sewage with a low carbon-nitrogen ratio and is an ideal sewage biological phosphorus and nitrogen removal equipment that meets the current local high emission standards.

[0079]

[0080] Second, as Figure 7 As shown, an application method of a sequencing batch reactor is provided, wherein the sequencing batch reactor is used for raw water treatment of organic matter and nitrogen and phosphorus, comprising the following steps: S101, mixing the raw water with the bottom mud and reacting them under anaerobic conditions; In one embodiment, S101 is performed in the anaerobic reaction unit 4 .

[0081] S102, reacting the treated solution obtained in S101 under anoxic conditions; In one embodiment, S102 is performed in the first anoxic reaction unit 5A.

[0082] S103, reacting the treated liquid obtained in S102 under anoxic conditions; In one embodiment, S103 is performed in the second anoxic reaction unit 5B; S104, the treated liquid obtained in S103 is reacted under aeration conditions; In one embodiment, S104 is performed in the aerobic unit 6; S105, optionally mixing the treated liquid obtained in S104 with part of the treated liquid obtained in S101, and reacting under anoxic or aerobic conditions, In one embodiment, S105 is performed in the first anoxic reaction unit 8A and the second anoxic reaction unit 9A.

[0083] S106, mixing the treated liquid obtained in S105 with an external carbon source addition liquid, and reacting them under anoxic conditions; In one embodiment, S106 is performed in the third anoxic reaction unit 8B and the fourth anoxic reaction unit 9B.

[0084] S107, reacting the treated solution obtained in S106 under anoxic conditions; In one embodiment, S107 is performed in a sequential batch unit; further preferably, S7 is performed in the first sequential batch unit 1.

[0085] S108, reacting the treated liquid obtained in S107 under aeration conditions; In one embodiment, S108 is performed in a sequential batch unit; further preferably, S8 is performed in the first sequential batch unit 1.

[0086] S109, the treatment solution obtained in S108 was allowed to settle; In one embodiment, S109 is performed in a sequential batch unit; further preferably, S9 is performed in the first sequential batch unit 1.

[0087] S110, the treated liquid obtained in S109 is precipitated out of water; In one embodiment, S110 is performed in a sequencing batch unit; further preferably, S10 is performed in the first sequencing batch unit 1.

[0088] Part of the treated liquid is taken in S107 and / or S108 and / or part of the precipitated sludge is taken in S109 and / or S110 to separate the supernatant and the sludge. In one embodiment, the separation is performed in the mud-water separation unit 2 to obtain the supernatant and the sludge.

[0089] The sludge is optionally reacted under anaerobic conditions and then recycled to S101; the separated supernatant is added to the treated liquid of S110 to precipitate water. In one embodiment, the sludge is reacted under anaerobic conditions in the pre-anoxic unit 3.

[0090] The first anoxic reaction unit 8A, the third anoxic reaction unit 8B, the first batch unit 1, the second anoxic reaction unit 9A, the fourth anoxic reaction unit 9B, and the second batch unit 7 can perform steps interchangeably, thereby performing a cyclic process. In any cycle of the cycle, when one of the first batch unit 1 and the second batch unit 7 performs S106, S107, and S108, the other performs S109.

[0091] Thirdly, Figure 8 As shown, another application method of a sequencing batch reactor is provided, wherein the sequencing batch reactor is used for treating excess combined sewer overflow sewage containing a large amount of suspended solids, comprising the following steps: S201, mixing part of the influent with the bottom mud and reacting under anaerobic conditions; In one embodiment, S201 is performed in the anaerobic reaction unit 4; S202, reacting the treated solution obtained in S201 under anoxic conditions; In one embodiment, S202 is performed in the first anoxic reaction unit 5A; S203, reacting the treated liquid obtained in S202 under anoxic conditions; In one embodiment, S203 is performed in the second anoxic reaction unit 5B; S204, reacting the treated liquid obtained in S203 under aeration conditions; In one embodiment, S204 is performed in an aerobic unit 6; S205, inputting part of the influent water into the end of the aerobic unit 6, mixing with the treated liquid obtained in S204, and reacting under aeration conditions; In one embodiment, S205 is performed in the first anoxic reaction unit 8A and the second anoxic reaction unit 9A; S206, reacting the treated liquid obtained in S205 under aeration conditions; In one embodiment, S206 is performed in the third anoxic reaction unit 8B and the fourth anoxic reaction unit 9B; S207, precipitating the treated liquid obtained in S206 into water; In one embodiment, S207 is performed simultaneously in the first sequential batch unit 1 and the second sequential batch unit 7; Part of the precipitated sludge is taken in S207 and separated to obtain a supernatant and sludge. In one embodiment, the supernatant and sludge are separated in the sludge-water separation unit 2 .

[0092] The sludge is reacted under anaerobic conditions and then recycled in S201. The supernatant obtained by separation can be added to the treated liquid in S207 to precipitate water. In one embodiment, the sludge is reacted under anaerobic conditions in the pre-anoxic unit 3.

[0093] It should be understood that, although the various steps in the flowcharts in the above-described embodiments are sequentially displayed according to the indications of the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and they can be executed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily to be carried out sequentially, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sequencing batch reactor, characterized in that: include: An anaerobic reaction unit, an anoxic reaction unit, an aerobic unit, an anoxic reaction unit, a sequencing batch unit and a pretreatment unit, wherein the anaerobic reaction unit is connected to the anoxic reaction unit and the anoxic reaction unit, the anoxic reaction unit is connected to the aerobic unit, the aerobic unit is connected to the anoxic reaction unit, the anoxic reaction unit is connected to the sequencing batch unit, the sequencing batch unit is connected to the pretreatment unit, and the pretreatment unit is connected to the anaerobic reaction unit.

2. A sequencing batch reactor according to claim 1, characterized in that: The anoxic reaction unit and the sequencing batch unit are provided in multiple groups, and intermittent reactions are performed in sequence.

3. A sequencing batch reactor according to claim 1, characterized in that: The pretreatment unit comprises a pre-anoxic unit and a mud-water separation unit, the sequencing batch unit is communicated with the mud-water separation unit, the mud-water separation unit is communicated with the pre-anoxic unit, and the pre-anoxic unit is communicated with the anaerobic reaction unit.

4. A sequencing batch reactor according to claim 3, characterized in that: It also includes a water inlet distribution device, which is connected to the anaerobic reaction unit and the aerobic unit. The water inlet distribution unit is used to transport raw water to the anaerobic reaction unit and the aerobic unit.

5. A sequencing batch reactor according to claim 3, characterized in that: The invention also comprises a control device, which is connected with the anaerobic reaction unit, the anoxic reaction unit, the aerobic unit, the anoxic reaction unit, the batch unit and the pretreatment unit.

6. A sequencing batch reactor according to claim 3, characterized in that: The sequencing batch unit is provided with a sludge enhanced return device for returning the precipitated sludge to the sludge-water separation unit and the anaerobic reaction unit; the sequencing batch unit is provided with a discharge device for discharging the sludge to the outside.

7. A sequencing batch reactor according to claim 1, characterized in that: A plurality of hydraulic guide walls are arranged in the aerobic unit.

8. A sequencing batch reactor according to claim 1, characterized in that: A hydraulic retaining wall is arranged in the middle of the sequencing batch unit, the top of the hydraulic retaining wall is arranged inclined, and a balancing hole is arranged at the bottom of the hydraulic retaining wall.

9. The method for using a sequencing batch reactor according to any one of claims 1 to 8, characterized in that: The sequencing batch reactor is used for raw water treatment of organic matter and nitrogen and phosphorus.

10. The method for using a sequencing batch reactor according to any one of claims 1 to 8, characterized in that: The sequencing batch reactor is used for treating excess combined sewer overflow sewage containing a large amount of suspended matter.

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