Method and apparatus for sewage treatment

Abstract

Disclosed are a sewage treatment method and device. The sewage treatment method comprises: introducing sewage into an anaerobic baffled reactor; introducing effluent of the anaerobic baffled reactor into a short-cut nitrification-denitrification reactor to perform nitrification-denitrification treatment; performing first reflux treatment on a part of effluent of the short-cut nitrification-denitrification reactor; introducing another part of the effluent of the short-cut nitrification-denitrification reactor into a sedimentation tank to filter and precipitate sludge in the sedimentation tank; and performing second reflux treatment on the sludge of the sedimentation tank. The present disclosure controls the removal of phosphorus in the realization of the denitrification phosphorus removal stage in the anaerobic baffled reactor through the organic combination of the aerobic mixed liquid of the short-cut nitrification-denitrification, the high-quality auxiliary carbon source provided by the sedimentation tank and the anaerobic or anoxic separate-phase sludge area of the anaerobic baffled reactor, strengthens the short-cut nitrification, thereby enhancing the ability of the short-cut nitrification to degrade organic pollutants and remove nitrogen and phosphorus. At the same time, the process flow of sewage treatment is shortened, the cost is reduced, and the operation and management are more convenient.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to wastewater treatment, and more particularly, to a wastewater treatment method and apparatus in which a short-cut nitrification-denitrification process, a sedimentation process of a sedimentation tank, and an anaerobic baffled reactor are organically combined. BACKGROUND

[0002] Wastewater treatment refers to measures taken to change the properties of wastewater so as not to cause harm to water bodies. Generally, the properties of wastewater are changed by performing denitrification and dephosphorization treatment on the wastewater. However, conventional denitrification and dephosphorization processes have the following disadvantages: ① both the process of removing organic matter and the process of nitrification of ammonia nitrogen consume energy; ② sufficient easily degradable organic matter needs to be provided in both the denitrification and dephosphorization stages; and ③ the amount of residual sludge in the system is large, and the cost of sludge treatment is high. SUMMARY

[0003] The present disclosure aims to provide a wastewater treatment method and apparatus that can improve wastewater treatment capacity, shorten the process flow of wastewater treatment, and reduce the cost of wastewater treatment.

[0004] According to one embodiment of the present disclosure, a wastewater treatment method is provided, characterized in that the wastewater treatment method comprises: introducing wastewater into an anaerobic baffled reactor; introducing effluent of the anaerobic baffled reactor into a short-cut nitrification-denitrification reactor to perform nitrification-denitrification treatment; performing first reflux treatment on a portion of effluent of the short-cut nitrification-denitrification reactor; introducing another portion of the effluent of the short-cut nitrification-denitrification reactor into a sedimentation tank to filter and sediment sludge in the sedimentation tank; and performing second reflux treatment on the sludge of the sedimentation tank.

[0005] Optionally, the anaerobic baffled reactor comprises a plurality of compartments, and a first compartment of the plurality of compartments is provided with a first filler.

[0006] Optionally, a second compartment of the plurality of compartments, which is located after the first compartment, is used for the first reflux treatment and the second reflux treatment.

[0007] Optionally, the short-cut nitrification-denitrification reactor is provided with a second filler and an oxic activated sludge.

[0008] Optionally, the step of performing the first reflux treatment on the portion of the effluent of the short-cut nitrification-denitrification reactor comprises: introducing the portion of the effluent of the short-cut nitrification-denitrification reactor into a rear section of the anaerobic baffled reactor.

[0009] Optionally, the step of performing the second reflux treatment on the sludge of the sedimentation tank comprises: sequentially performing sludge concentration treatment, sludge pretreatment, sludge hydrolysis acidification treatment, sludge conditioning treatment, and sludge pressure filtration treatment on the sludge of the sedimentation tank.

[0010] Optionally, the step of performing the second reflux treatment on the sludge of the sedimentation tank further comprises: adding filtrate after sludge filter pressing treatment to the latter section of the anaerobic baffled reactor.

[0011] According to one embodiment of the present disclosure, there is provided a sewage treatment device, characterized in that the sewage treatment device comprises: an anaerobic baffled reactor configured to receive sewage; a short-cut nitrification and denitrification reactor configured to receive effluent of the anaerobic baffled reactor to perform nitrification and denitrification treatment; a first reflux treatment module configured to perform first reflux treatment on a part of effluent of the short-cut nitrification and denitrification reactor; a sedimentation tank configured to receive another part of the effluent of the short-cut nitrification and denitrification reactor to filter and precipitate sludge in the sedimentation tank; and a second reflux treatment module configured to perform second reflux treatment on the sludge of the sedimentation tank.

[0012] Optionally, the anaerobic baffled reactor comprises a plurality of compartments, and a first compartment in the plurality of compartments is provided with a first filler.

[0013] Optionally, a second compartment in the plurality of compartments after the first compartment is used for the first reflux treatment and the second reflux treatment.

[0014] Optionally, the short-cut nitrification and denitrification reactor is added with a second filler and an aerobic activated sludge.

[0015] Optionally, the first reflux treatment module is configured to introduce the part of the effluent of the short-cut nitrification and denitrification reactor to the latter section of the anaerobic baffled reactor.

[0016] Optionally, the second reflux treatment module is configured to sequentially perform sludge concentration treatment, sludge pretreatment, sludge hydrolysis and acidification treatment, sludge conditioning treatment and sludge filter pressing treatment on the sludge of the sedimentation tank.

[0017] Optionally, the second reflux treatment module is further configured to add filtrate after sludge filter pressing treatment to the latter section of the anaerobic baffled reactor.

[0018] According to one embodiment of the present disclosure, there is provided a computer readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the sewage treatment method as described above.

[0019] According to one embodiment of the present disclosure, there is provided a control device, characterized in that the control device comprises: a processor; and a memory storing a computer program, when the computer program is executed by the processor, implements the sewage treatment method as described above.

[0020] The present disclosure controls the removal of phosphorus in the denitrification phosphorus removal stage in the anaerobic baffled reactor by the organic combination of the high-quality auxiliary carbon source provided by the short-range nitrification and denitrification aerobic mixed liquid and the sedimentation tank and the anaerobic or anoxic phase separation sludge area of the anaerobic baffled reactor, strengthens the short-range nitrification, and thus enhances the ability of the short-range nitrification to degrade organic pollutants and remove nitrogen and phosphorus. At the same time, the process flow of the sewage treatment is shortened, the cost is reduced, and the operation and management are more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or other aspects of the present disclosure will become apparent and more readily appreciated from the following detailed description, taken in conjunction with the accompanying drawings.

[0022] Figure 1 FIG. 1 is a flowchart illustrating a sewage treatment method according to an embodiment of the present disclosure.

[0023] Figure 2 FIG. 2 is a schematic diagram illustrating an anaerobic baffled reactor according to an embodiment of the present disclosure.

[0024] Figure 3 FIG. 3 is a block diagram illustrating a sewage treatment apparatus according to an embodiment of the present disclosure.

[0025] Figure 4 FIG. 4 is a detailed block diagram illustrating a sewage treatment apparatus according to an embodiment of the present disclosure.

[0026] Figure 5 FIG. 5 is a block diagram illustrating a control device of a sewage treatment apparatus according to an embodiment of the present disclosure.

[0027] Throughout the drawings and detailed description, unless otherwise described or provided, the same drawing reference numerals will be understood to refer to the same element, feature, and structure. The drawings can not be to scale, and the relative dimensions, proportions, and depiction of the elements in the drawings can be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION

[0028] The following detailed description is provided to help the reader obtain a thorough understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be clear to those skilled in the art after understanding the disclosure provided herein. For example, the order of the operations described herein is merely an example, and is not limited to those set forth herein, but can be changed as will be clear to those skilled in the art after understanding the disclosure provided herein, except for operations that must occur in a specific order. In addition, the description of features known after understanding the disclosure provided herein can be omitted for increased clarity and conciseness.

[0029] The features described herein can be implemented in different ways depending upon the implementation. The described examples are to be considered in a sense illustrative and not restrictive. Rather, the described examples are provided as merely some ways implementing the methods, devices and / or systems described herein but various ways to implement the described methods, devices and / or systems will be apparent to those of ordinary skill in the art after understanding the disclosure presented herein.

[0030] Throughout the specification, where assemblies are described as "connected to" or "coupled to" other assemblies, it will be understood that the assemblies can be directly connected or coupled to the other assemblies, or intervening assemblies can be present. In contrast, where an element is described as being "directly connected to" or "directly coupled to" another element, there are no intervening elements present. Similarly, expressions such as "between" and "amongst" and "adjacent to" and "immediately adjacent to" should also be interpreted in the same way. As used herein, the term "and / or" includes any one of the listed items or any combination of two or more of the listed items.

[0031] Although terms such as "first", "second" and "third" can be used herein to describe various components, assemblies, regions, layers or sections, these components, assemblies, regions, layers or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer or section from another component, assembly, region, layer or section. Thus, a component, assembly, region, layer or section referred to as a first component, a first assembly, a first region, a first layer or a first section in the examples described herein can also be referred to as a second component, a second assembly, a second region, a second layer or a second section without departing from the teachings of the examples.

[0032] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting. The use of singular terms will also be considered to include the plural unless the context clearly indicates otherwise. The terms "comprising", "including", and "having" are meant to be inclusive and not restrictive; they specify the presence of stated features, integers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, operations, components, elements, and / or combinations thereof.

[0033] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art in the field of the disclosure based on the disclosure provided herein, and the same meaning as those in the field of the disclosure. Unless specifically defined, terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the disclosure provided herein, and are not to be interpreted in an idealized or overly formal sense. The use of the term "may" in the examples or embodiments herein (for example, as to what an example or embodiment can include or implement) indicates that there is at least one example or embodiment including or implementing such feature, and all examples are not limited thereto.

[0034] Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0035] Figure 1 is a flow chart illustrating a sewage treatment method according to an embodiment of the present disclosure. Figure 2 is a schematic diagram illustrating an anaerobic baffled reactor according to an embodiment of the present disclosure.

[0036] Referring to Figure 1 At step S100, sewage can be introduced into an anaerobic baffled reactor.

[0037] In one example, sewage or wastewater can be directly introduced into an anaerobic baffled reactor. In another example, sewage or wastewater can be introduced into an anaerobic baffled reactor after being treated by physical treatment.

[0038] An anaerobic baffled reactor (ABR) is a high-efficiency anaerobic biological treatment reactor. The anaerobic baffled reactor used in the present disclosure can be selected from a fast-assembled and delivered equipment. The reaction principle of the anaerobic baffled reactor is as follows: after wastewater enters the anaerobic baffled reactor, it flows through each baffle reaction zone in the form of upflow, and due to gas production and upward flow rate, n upflow sludge bed reactors are formed, where n is a natural number greater than or equal to 2. The anaerobic baffled reactor has the following characteristics: simple structure, no need for fillers in the lower part of the anaerobic baffled reactor, no need for special gas separation devices, no mechanical stirring, little plugging, longer sludge retention time (SRT) and shorter hydraulic retention time (HRT), most organic wastewater can be adapted, and it can resist shock load.

[0039] Referring to Figure 2 According to an embodiment of the present disclosure, the anaerobic baffled reactor can include a plurality of compartments, and a first compartment of the plurality of compartments can be provided with a first filler.

[0040] In one example, the anaerobic baffled reactor can be composed of 3 to n compartments. For example, when the anaerobic baffled reactor is composed of 3 compartments, the 1st compartment can be a primary transition sedimentation zone, the 2nd compartment can be a front-end dosing zone of fillers (e.g., first fillers), and the 3rd compartment can be a nitrification liquid reflux and auxiliary carbon source dosing zone. In a preferred example, the anaerobic baffled reactor can be composed of 4 to 9 compartments. In other examples, the anaerobic baffled reactor can be composed of 2 compartments.

[0041] Due to the structural feature of the anaerobic baffled reactor having separate compartments (i.e., multiple compartments) as described above, microorganisms suitable for different substrate concentrations and environmental conditions can be cultivated, and the acid-producing stage and the methane-producing stage are separated along the water flow direction of the reactor. This allows each compartment to be dominated by different bacterial populations, with acidification mainly occurring in the front compartment units, and methanogenesis being dominant in the rear compartments, thereby more favorably improving the operation effect of the anaerobic baffled reactor. In addition, the unique separate compartment structure and plug flow of the anaerobic baffled reactor allow the cultivation of microbial communities in each reaction chamber that are adapted to the quality of wastewater flowing into the reaction chamber and the environmental conditions, allowing the rational distribution of microbial populations. At the same time, the up-and-down water flow pattern in the anaerobic baffled reactor allows the sludge to fully contact with the wastewater, and has a strong impact load capacity. Therefore, the anaerobic baffled reactor has the optimal operating conditions for providing high-quality carbon sources under anaerobic / anoxic conditions, allowing microbial separation, and facilitating the formation of short-cut denitrification and phosphorus removal.

[0042] In one example, the first fillers can include anaerobic ammonia oxidation fillers (e.g., anaerobic ammonia oxidation bacteria). Fillers are carriers for the growth of microorganisms, and their performance can affect the efficiency of the anaerobic baffled reactor and the wastewater treatment effect. Fillers can be classified into many types according to different shapes, properties, and materials, and in general, should mainly have the following characteristics, as described in the table below. The presence of fillers can, on the one hand, cause the sludge entrained with air bubbles to collide with the fillers during the rising process, promoting the separation of sludge and air bubbles, facilitating the sedimentation and retention of sludge, and reducing the loss of sludge; on the other hand, it is conducive to the attachment and growth of microorganisms and the formation of biofilms, allowing the anaerobic baffled reactor to maintain a high biomass and improve the treatment efficiency.

[0043] Although anaerobic baffled reactor does not need fillers in its lower part, fillers can be installed in the upper part of the anaerobic baffled reactor. The biofilm growing on the fillers is full of anaerobic microorganisms. When the anaerobic reactor is running, under certain hydraulic conditions, the aggregates formed by the microorganisms such as hydrolysis and fermentation bacteria, hydrogen-producing bacteria, methane-producing bacteria, etc. through self-immobilization. The present disclosure is full of anaerobic ammonia oxidation bacteria on the biofilm, so that the anaerobic ammonia oxidation bacteria directly oxidize ammonia nitrogen to nitrogen gas with nitrite nitrogen as the electron acceptor under anaerobic or anoxic conditions, making full use of the original reactor's dead volume. The presence of fillers allows the anaerobic sludge rising with the gas bubbles to separate from the gas, reducing the loss of sludge. The suspended organic matter rising with the gas is fully degraded in the process of contacting the biofilm attached to the fillers. A large amount of anaerobic granular sludge grows below the anaerobic baffled reactor, and the biodegradation of these granular sludge can remove the organic matter in the wastewater, that is, the anaerobic baffled reactor under anaerobic conditions, through sludge granulation and phase separation, relies on the efficient and high-energy acid-producing effect of organic matter hydrolysis and acidification to provide high-quality carbon source for denitrifying phosphorus removal. The amount of high-quality carbon source provided for denitrifying phosphorus removal is determined by the amount of anaerobic phosphorus release and anoxic phosphorus uptake in the anaerobic baffled reactor, the competition between the methanogenic bacteria and the denitrifying phosphorus removal bacteria for the substrate is controlled and coordinated, and effective carbon, nitrogen and phosphorus conversion and removal are achieved. At the same time, through operation control and cycle linkage, the operation conditions of the anaerobic baffled reactor for providing sufficient high-quality carbon source for denitrifying phosphorus removal are obtained.

[0044] In one example, a second compartment of the plurality of compartments, which is subsequent to the first compartment, can be used for the first reflux treatment and the second reflux treatment. Hereinafter, the first reflux treatment and the second reflux treatment will be described in detail.

[0045] In step S200, the effluent of the anaerobic baffled reactor can be introduced into the short-cut nitrification and denitrification reactor to perform nitrification and denitrification treatment.

[0046] According to embodiments of the present disclosure, the wastewater treated by the anaerobic baffled reactor can be treated by short-cut nitrification and denitrification. Aerobic granular sludge and anaerobic ammonia oxidation fillers are added in the short-cut nitrification and denitrification process to strengthen denitrification and phosphorus removal through multiple ways.

[0047] Most of the current short-cut nitrification-denitrification technology research chooses traditional sequencing batch reactor (SBR) process and anoxic-oxic (AO) process as the basis. The sequencing batch reactor is a kind of activated sludge sewage treatment technology operated in an intermittent aeration mode. Its main feature is the sequential and intermittent operation. The core of the sequencing batch reactor is the sequencing batch reactor tank, which integrates homogenization, primary sedimentation, biological degradation, and secondary sedimentation in one tank without a sludge return system. It is especially suitable for situations where construction space is insufficient, intermittent discharge, and large flow rate variations. The decanter is a key equipment for the sequencing batch reactor.

[0048] In the anoxic-oxic process (AO), A (Anaerobic) refers to the anoxic section for denitrification, and O (Oxic) refers to the oxic section for removing organic matter in water. Anoxic-oxic is used for phosphorus removal. The anoxic-oxic process is one of the most widely used biological denitrification processes for wastewater, which can effectively remove BOD (biochemical oxygen demand) and nitrogen-containing compounds. In the anoxic section, large-molecule organic matter in wastewater is decomposed into small-molecule organic matter, and insoluble organic matter is converted into soluble organic matter. Under sufficient oxygen supply conditions, autotrophic bacteria nitrification oxidizes NH3-N (NH4 + ) to NO3 - , and the nitrification liquid is returned to the anoxic tank. Under anoxic conditions, NO3 - is reduced to molecular nitrogen (N2). The presence of the anoxic section and the oxic section plays a crucial role in denitrification.

[0049] The current short-cut nitrification-denitrification technology oxidizes NH3-N in wastewater to NO2 - -N first, and then directly converts it to N2 through denitrification. This technology eliminates the conversion process from NO2-N to nitrate nitrogen, so the biological denitrification process can be completed through a shorter path of NH4 + + NO2 - → N2, which can reduce the energy consumption in the reaction and compensate for the characteristics of insufficient carbon source in urban domestic wastewater in China. However, this technology has very harsh reaction conditions and unstable reaction, and real-time monitoring of the water quality at each stage is required. Currently, the system is controlled to achieve more nitrate accumulation by controlling the sludge age, water temperature, dissolved oxygen concentration, and pH value.

[0050] According to embodiments of the present disclosure, the short-cut nitrification-denitrification reactor can be added with second fillers and facultative activated sludge.

[0051] The good activated sludge is also called good granular sludge or good activated granular sludge. The formation of granular sludge is a comprehensive result of physical, chemical and biological effects. Although a large number of studies have been conducted on the formation factors of aerobic granular sludge, the mechanism of sludge granulation is still not well explained at present. There is no consensus on the formation mechanism of granular sludge. Theories involved include the crystal nucleus hypothesis (i.e. the formation process of granular sludge is similar to the crystallization process, and the particle size of granular sludge gradually forms and matures on the basis of the original crystal nucleus), the electric neutralization hypothesis (the negative charge on the cell surface neutralizes the positively charged metal ions to reduce the mutual repulsion between bacteria, thereby facilitating the aggregation of bacteria to facilitate the formation of granular sludge), and the extracellular polymeric substances (EPS) hypothesis (i.e. EPS can change the surface charge characteristics and hydrophilic / hydrophobic properties of the sludge, thereby affecting the formation process of granular sludge).

[0052] In summary, the aerobic granular sludge technology is a new type of biofilm process developed by people to improve the settling performance of sludge and increase the biomass without adding biological carriers. It has obvious advantages over flocculent sludge in terms of shock load resistance and simultaneous nitrogen and phosphorus removal. The particle size of aerobic granular sludge is usually large, the structure is compact and stable, it can settle to the bottom of the reactor in a short time, and aerobic granular sludge has a certain porosity, so that the outside is aerobic environment and the inside is anaerobic environment, and heterotrophic bacteria, nitrifying bacteria and denitrifying bacteria coexist in the short-cut nitrification and denitrification reactor. That is, COD (chemical oxygen demand) can be removed under aerobic and anaerobic conditions, and a large amount of organic matter is removed, and the granules have the ability to resist high hydraulic load. Under high dissolved oxygen, NH4 + -N on the surface of the granules is converted, and NH4 + -N in the influent is oxidized. Subsequently, in the interior of the granules, NO3 - -N generated is converted to N2, so that simultaneous removal of organic matter and nitrogen occurs in one reactor. The number of microorganisms in aerobic granular sludge is much higher than that in activated sludge (e.g. it can be 4 to 6 times that of ordinary activated sludge), so it has a strong ability to resist shock load, and can remove high-concentration organic load water quality.

[0053] The present disclosure combines aerobic granular sludge technology with short-cut nitrification process, which helps to improve the treatment efficiency of ammonia-nitrogen wastewater and reduce the operation cost. Considering that the traditional large aeration amount and high dissolved oxygen operation mode will affect the short-cut nitrification process, the shorter settling time will cause a large loss of nitrifying bacteria with a long generation time, and other problems, therefore, an appropriate cultivation strategy needs to be taken to cultivate short-cut nitrification granular sludge. In view of the long cultivation period of aerobic granular sludge, the granular sludge is stored to speed up the application process of the granular sludge, and anaerobic ammonia oxidation filler is inoculated into the anoxic zone of the reactor, and the anaerobic ammonia oxidation bacteria use NO2 - -N as an electron acceptor, NH4 + -N as an electron donor, which is converted into N2 and a small amount of NO3 - -N, the short-cut nitrification denitrification can simultaneously and efficiently remove nitrogen and phosphorus, and reduce the water treatment cost.

[0054] In addition, a second filler can be added to the short-cut nitrification denitrification reactor to promote the short-cut nitrification denitrification treatment performed in the short-cut nitrification denitrification reactor.

[0055] In step S300, a first reflux treatment is performed on a part of the effluent of the short-cut nitrification denitrification reactor.

[0056] In the present disclosure, the first reflux is also referred to as nitrification liquid reflux. The nitrification liquid reflux is combined with the anaerobic or anoxic separate sludge zone of the anaerobic baffled reactor, which provides a high-quality carbon source, controls the removal of phosphorus, realizes the denitrification and phosphorus removal stage in the anaerobic baffled reactor, strengthens the short-cut nitrification, and thus enhances the degradation of organic pollutants and denitrification and phosphorus removal. The suspended organic matter rising with the gas is also fully degraded in the process of contacting the biofilm attached to the filler, and a large amount of anaerobic granular sludge is grown and added below the reactor, and the biodegradation of these granular sludge can also remove the organic matter in the wastewater. Subsequently, the treated domestic wastewater is subjected to short-cut nitrification denitrification, NH4 + -N is oxidized to NO2 - -N, and then directly converted from NO2 - -N is converted into N2 by denitrification.

[0057] According to an embodiment of the present disclosure, step S300 can include introducing the part of the effluent of the short-cut nitrification denitrification reactor to the latter section of the anaerobic baffled reactor.

[0058] As described above, the anaerobic baffled reactor can include a plurality of compartments, and a first compartment of the plurality of compartments can be provided with a first filler. In this case, a second compartment of the plurality of compartments, which is located after the first compartment, can be used for the first reflux treatment. For example, when the anaerobic baffled reactor is composed of 3 compartments, the 1st compartment can be a primary transition sedimentation zone, the 2nd compartment can be a filler (e.g., first filler) front-end addition zone, and the 3rd compartment can be a nitrification liquid reflux zone.

[0059] At step S400, another part of the effluent of the short-cut nitrification and denitrification reactor can be introduced into the sedimentation tank to filter and precipitate sludge in the sedimentation tank.

[0060] After the other part of the effluent of the short-cut nitrification and denitrification reactor is introduced into the sedimentation tank, the wastewater is clarified (solid-liquid separation) and sludge is concentrated (to increase the solid content of the reflux sludge and prepare sludge as a carbon source) by the sedimentation tank (e.g., secondary sedimentation tank). The sludge is subjected to anaerobic fermentation after being pressed to reduce the solid content in the sludge, and finally high-quality carbon sources (e.g., volatile fatty acids (VFAs)) are obtained,

[0061] At step S500, a second reflux treatment can be performed on the sludge of the sedimentation tank.

[0062] The second reflux treatment refers to a treatment in which the sludge of the sedimentation tank is re-added to the anaerobic baffled reactor as an auxiliary carbon source. Since the sludge of the sedimentation tank contains a large amount of organic matter, anaerobic fermentation not only reduces the solid content in the sludge, but also obtains high-quality auxiliary carbon sources (e.g., VFAs) that are helpful for biological nitrogen and phosphorus removal in the wastewater treatment process and have good application prospects. Therefore, the sludge of the sedimentation tank can be sequentially subjected to sludge concentration treatment, sludge pretreatment, sludge hydrolysis and acidification treatment, sludge conditioning treatment, and sludge pressing treatment to obtain auxiliary carbon sources, which are added to the anoxic zone of the anaerobic baffled reactor for microbial denitrification. In addition, the remaining auxiliary carbon sources can be stored or sold.

[0063] According to an embodiment of the present disclosure, step S500 can include introducing the part of the effluent of the short-cut nitrification and denitrification reactor to a rear section of the anaerobic baffled reactor.

[0064] As described above, the anaerobic baffled reactor can include a plurality of compartments, and a first compartment of the plurality of compartments can be provided with a first filler. In this case, a second compartment of the plurality of compartments, which is located after the first compartment, can be used for the second reflux treatment. For example, when the anaerobic baffled reactor is composed of 3 compartments, the 1st compartment can be a primary transition sedimentation zone, the 2nd compartment can be a filler (e.g., first filler) front-end addition zone, and the 3rd compartment can be an auxiliary carbon source addition zone.

[0065] Further, in one example, the nitrified liquid refluxing zone and the auxiliary carbon source dosing zone can be the same zone. For example, as described above, the anaerobic baffled reactor can include a plurality of compartments, a first compartment of the plurality of compartments can be provided with a first packing. In this case, a second compartment of the plurality of compartments, which is located after the first compartment, can be used for the first reflux treatment and the second reflux treatment. For example, when the anaerobic baffled reactor is composed of 3 compartments, the 1st compartment can be a primary transition sedimentation zone, the 2nd compartment can be a front-end dosing zone of packing (e.g., the first packing), and the 3rd compartment can be a nitrified liquid refluxing zone and an auxiliary carbon source dosing zone.

[0066] The present disclosure provides a high-quality auxiliary carbon source provided by the short-cut nitrification and denitrification aerobic mixed liquid and the sedimentation tank, and the organic combination of the anaerobic or anoxic phase separation sludge zone of the anaerobic baffled reactor, controls the removal of phosphorus in the denitrification phosphorus removal stage in the anaerobic baffled reactor, strengthens the short-cut nitrification, and thus enhances the ability of the anaerobic baffled reactor to degrade organic pollutants and remove nitrogen and phosphorus. At the same time, the process flow of wastewater treatment is shortened, the cost is reduced, and the operation and management are more convenient.

[0067] Figure 3 is a block diagram illustrating a wastewater treatment device according to an embodiment of the present disclosure. Figure 4 is a detailed block diagram illustrating a wastewater treatment device according to an embodiment of the present disclosure.

[0068] Referring to Figure 3 and Figure 4 , the wastewater treatment device 100 can include an anaerobic baffled reactor 110, a short-cut nitrification and denitrification reactor 120, a first reflux treatment module 130, a sedimentation tank 140, and a second reflux treatment module 150.

[0069] According to an embodiment of the present disclosure, the anaerobic baffled reactor 110 can be configured to receive wastewater. In one example, the wastewater or sewage can be directly introduced into the anaerobic baffled reactor. In another example, the wastewater or sewage can be introduced into the anaerobic baffled reactor after being treated by physical treatment. The anaerobic baffled reactor 110 can include a plurality of compartments, a first compartment of the plurality of compartments can be provided with a first packing. In one example, the anaerobic baffled reactor can be composed of 3 to n compartments. For example, when the anaerobic baffled reactor is composed of 3 compartments, the 1st compartment can be a primary transition sedimentation zone, the 2nd compartment can be a front-end dosing zone of packing (e.g., the first packing), and the 3rd compartment can be a nitrified liquid refluxing zone and an auxiliary carbon source dosing zone. In a preferred example, the anaerobic baffled reactor can be composed of 4 to 9 compartments. In other examples, the anaerobic baffled reactor can be composed of 2 compartments. In one example, the first packing can include an anammox packing (e.g., anammox bacteria). A second compartment of the plurality of compartments, which is located after the first compartment, can be used for the first reflux treatment and the second reflux treatment.

[0070] According to embodiments of the present disclosure, the short-cut nitrification-denitrification reactor 120 can be configured to receive the effluent of the anaerobic baffled reactor to perform nitrification-denitrification treatment. The short-cut nitrification-denitrification reactor 120 can be dosed with a second packing and an oxic activated sludge.

[0071] According to embodiments of the present disclosure, the first reflux treatment module 130 can be configured to perform a first reflux treatment on a portion of the effluent of the short-cut nitrification-denitrification reactor. In one example, the first reflux treatment module 130 can be configured to introduce the portion of the effluent of the short-cut nitrification-denitrification reactor to a later stage of the anaerobic baffled reactor. As described above, the anaerobic baffled reactor can include a plurality of compartments, a first compartment of the plurality of compartments can be provided with a first packing. In this case, a second compartment of the plurality of compartments, which is located after the first compartment, can be used for the first reflux treatment. For example, when the anaerobic baffled reactor is composed of 3 compartments, the 1st compartment can be a primary transition sedimentation zone, the 2nd compartment can be a packing (e.g., the first packing) front dosing zone, and the 3rd compartment can be a nitrification liquid reflux zone.

[0072] According to embodiments of the present disclosure, the sedimentation tank 140 can be configured to receive another portion of the effluent of the short-cut nitrification-denitrification reactor to filter and settle the sludge in the sedimentation tank.

[0073] According to an embodiment of the present disclosure, the second reflux treatment module 150 can be configured to perform a second reflux treatment on the sludge of the sedimentation tank. In one example, the second reflux treatment module 150 can be configured to sequentially perform a sludge concentration treatment, a sludge pretreatment, a sludge hydrolysis acidification treatment, a sludge conditioning treatment, and a sludge filter pressing treatment on the sludge of the sedimentation tank. In one example, the second reflux treatment module 150 can be further configured to add the filtrate after the sludge filter pressing treatment to the rear section of the anaerobic baffled reactor. As described above, the anaerobic baffled reactor can include a plurality of compartments, and a first compartment of the plurality of compartments can be provided with a first filler. In this case, a second compartment of the plurality of compartments, which is located after the first compartment, can be used for the second reflux treatment. For example, when the anaerobic baffled reactor is composed of 3 compartments, the 1st compartment can be a primary transition sedimentation zone, the 2nd compartment can be a filler (e.g., first filler) front-end addition zone, and the 3rd compartment can be an auxiliary carbon source addition zone. In addition, in one example, the nitrification liquid reflux zone and the auxiliary carbon source addition zone can be the same zone. For example, as described above, the anaerobic baffled reactor can include a plurality of compartments, and a first compartment of the plurality of compartments can be provided with a first filler. In this case, a second compartment of the plurality of compartments, which is located after the first compartment, can be used for the first reflux treatment and the second reflux treatment. For example, when the anaerobic baffled reactor is composed of 3 compartments, the 1st compartment can be a primary transition sedimentation zone, the 2nd compartment can be a filler (e.g., first filler) front-end addition zone, and the 3rd compartment can be a nitrification liquid reflux zone and an auxiliary carbon source addition zone.

[0074] In addition, the present disclosure controls the removal of phosphorus in the denitrification phosphorus removal stage in the anaerobic baffled reactor by the organic combination of the high-quality auxiliary carbon source provided by the short-cut nitrification and denitrification aerobic mixed liquid and the sedimentation tank and the anaerobic or anoxic phase separation sludge zone of the anaerobic baffled reactor, strengthens the short-cut nitrification, and thus enhances the ability to degrade organic pollutants and remove nitrogen and phosphorus. At the same time, the process flow of the wastewater treatment is shortened, the cost is reduced, and the operation and management are more convenient.

[0075] In addition, with reference to Figure 4 , according to an embodiment of the present disclosure, the wastewater treatment system can be powered by green energy such as solar energy or wind energy, to further improve the efficiency of the system using green energy, and solve the problems of high economic cost, low carbon, and low energy saving of the existing wastewater treatment technology. In addition, the wastewater treatment system can be powered by green energy such as solar energy or wind energy, to achieve energy self-sufficiency and surplus electricity on the network.

[0076] Figure 5 is a block diagram showing a control device of a wastewater treatment device according to an embodiment of the present disclosure.

[0077] With reference to Figure 5The control device 200 of the wastewater treatment apparatus according to embodiments of the present disclosure can be, but is not limited to, a programmable logic controller (PLC) industrial computer. The control device 200 of the wastewater treatment apparatus according to embodiments of the present disclosure can include a processor 210 and a memory 220. The processor 210 can include, but is not limited to, a central processing unit (CPU), a digital signal processor (DSP), a microcomputer, a field programmable gate array (FPGA), a system on chip (SoC), a microprocessor, an application specific integrated circuit (ASIC), etc. The memory 720 stores a computer program to be executed by the processor 210. The memory 220 includes a high-speed random access memory and / or a non-volatile computer readable storage medium. When the processor 210 executes the computer program stored in the memory 220, the wastewater treatment method as described above can be implemented.

[0078] Alternatively, the control device 200 can communicate with other components in the water treatment system in a wired / wireless communication manner, and can also communicate with other devices in the water treatment system in a wired / wireless communication manner. In addition, the control device 200 can communicate with devices outside the water treatment system in a wired / wireless communication manner. In addition, the control device 200 can have a timer and an encoder function.

[0079] The wastewater treatment method according to the embodiments of the present disclosure can be written as a computer program and stored on a computer-readable storage medium. When the computer program is executed by a processor, the wastewater treatment method as described above can be implemented. Examples of the computer-readable storage medium include a read-only memory (ROM), a random access programmable read-only memory (PROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), a dynamic random access memory (DRAM), a static random access memory (SRAM), a flash memory, a non-volatile memory, a CD-ROM, a CD-R, a CD+R, a CD-RW, a CD+RW, a DVD-ROM, a DVD-R, a DVD+R, a DVD-RW, a DVD+RW, a DVD-RAM, a BD-ROM, a BD-R, a BD-R LTH, a BD-RE, a Blu-ray or an optical disc memory, a hard disk drive (HDD), a solid state drive (SSD), a card memory such as a multimedia card, a secure digital (SD) card, or an extreme digital (XD) card, a magnetic tape, a floppy disk, a magneto-optical data storage device, an optical data storage device, a hard disk, a solid state disk, and any other device configured to store a computer program and any associated data, data files, and data structures in a non-transitory manner and provide the computer program and any associated data, data files, and data structures to a processor or a computer so that the processor or the computer can execute the computer program. In one example, the computer program and any associated data, data files, and data structures are distributed over a networked computer system so that the computer program and any associated data, data files, and data structures are stored, accessed, and executed by one or more processors or computers in a distributed manner.

[0080] In addition, the present disclosure provides a high-quality auxiliary carbon source provided by the short-range nitrification-denitrification aerobic mixed liquid and the sedimentation tank, and the organic combination of the anaerobic or anoxic separate sludge zone of the anaerobic baffled reactor, controls the removal of phosphorus in the denitrification phosphorus removal stage in the anaerobic baffled reactor, strengthens the short-range nitrification, and thus enhances the ability of the short-range nitrification to degrade organic pollutants and remove nitrogen and phosphorus. At the same time, the process flow of wastewater treatment is shortened, the cost is reduced, and the operation and management are more convenient.

[0081] Although the present disclosure has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application as defined by the appended claims.

Claims

1. A wastewater treatment method, characterized in that, The wastewater treatment method includes: Wastewater is introduced into an anaerobic baffled reactor; The effluent from the anaerobic baffle reactor is introduced into a short-cut nitrification-denitrification reactor to perform nitrification-denitrification treatment; A portion of the effluent from the short-cut nitrification-denitrification reactor undergoes a first reflux treatment; Another portion of the effluent from the short-cut nitrification-denitrification reactor is introduced into a sedimentation tank to filter and settle the sludge in the sedimentation tank. The sludge from the sedimentation tank undergoes a second reflux treatment. The anaerobic baffled reactor includes multiple compartments, and the first compartment of the multiple compartments is provided with a first packing material; the first packing material includes anaerobic ammonia oxidation packing material. The second compartment, located after the first compartment, is used for the first and second reflux processes. The short-cut nitrification-denitrification reactor is equipped with a second packing material and aerobic activated sludge. The aerobic activated sludge has a certain porosity, which makes the external environment aerobic and the internal environment anaerobic, allowing heterotrophic bacteria, nitrifying bacteria and denitrifying bacteria to coexist in the short-cut nitrification-denitrification reactor.

2. The wastewater treatment method as described in claim 1, characterized in that, The steps of performing a first reflux treatment on a portion of the effluent from a short-cut nitrification-denitrification reactor include: A portion of the effluent from the short-cut nitrification-denitrification reactor is introduced into the downstream section of the anaerobic baffled reactor.

3. The wastewater treatment method as described in claim 1, characterized in that, The steps for performing a second reflux treatment on the sludge from the sedimentation tank include: The sludge in the sedimentation tank is subjected to sludge thickening treatment, sludge pretreatment, sludge hydrolysis and acidification treatment, sludge conditioning treatment and sludge pressure filtration treatment in sequence.

4. The wastewater treatment method as described in claim 3, characterized in that, The second reflux treatment of sludge from the sedimentation tank also includes: The filtrate after sludge depressurization is added to the downstream section of the anaerobic baffled reactor.

5. A wastewater treatment device, characterized in that, The wastewater treatment device includes: The anaerobic baffled reactor is configured to receive wastewater; The short-cut nitrification-denitrification reactor is configured to receive the effluent from the anaerobic baffle reactor to perform nitrification-denitrification treatment. The first reflux treatment module is configured to perform a first reflux treatment on a portion of the effluent from the short-cut nitrification-denitrification reactor. The sedimentation tank is configured to receive another portion of the effluent from the short-cut nitrification-denitrification reactor to filter and settle the sludge in the sedimentation tank. The second reflux treatment module is configured to perform a second reflux treatment on the sludge in the sedimentation tank. The anaerobic baffled reactor includes multiple compartments, and the first compartment of the multiple compartments is provided with a first packing material; the first packing material includes anaerobic ammonia oxidation packing material. The second compartment, located after the first compartment, is used for the first and second reflux processes. The short-cut nitrification-denitrification reactor is equipped with a second packing material and aerobic activated sludge. The aerobic activated sludge has a certain porosity, which makes the external environment aerobic and the internal environment anaerobic, allowing heterotrophic bacteria, nitrifying bacteria and denitrifying bacteria to coexist in the short-cut nitrification-denitrification reactor.

6. The wastewater treatment device as described in claim 5, characterized in that, The first reflow processing module is configured as follows: A portion of the effluent from the short-cut nitrification-denitrification reactor is introduced into the downstream section of the anaerobic baffled reactor.

7. The wastewater treatment device as described in claim 5, characterized in that, The second reflow processing module is configured as follows: The sludge in the sedimentation tank is subjected to sludge thickening treatment, sludge pretreatment, sludge hydrolysis and acidification treatment, sludge conditioning treatment and sludge pressure filtration treatment in sequence.

8. The wastewater treatment apparatus as described in claim 7, characterized in that, The second reflux treatment module is also configured to add the filtrate after sludge dewatering to the downstream section of the anaerobic baffle reactor.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the wastewater treatment method as described in any one of claims 1 to 4.

10. A control device, characterized in that, The control device includes: processor; A memory storing a computer program that, when executed by a processor, implements the wastewater treatment method as described in any one of claims 1 to 4.

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