Sewage treatment process for realizing self-flowing of filler by utilizing density flow

Abstract

The invention discloses a sewage treatment process for realizing filler self-flowing by using density flow, which is realized in an MBBR filler area of a biochemical pool with a microporous aerator at the bottom, and comprises the following process steps: (1) dividing the MBBR filler area into an area A and an area B; the area A is the first section of the MBBR filler area, and the area B is the remaining part of the MBBR filler area; the area of the area A is 1 / 3-1 / 4 of the area of the MBBR filler area; and (2) all the microporous aerators in the area A are closed. According to the sewage treatment process for realizing self-flowing of the filler by utilizing density flow, a perforated aeration pipe does not need to be arranged in an MBBR filler area of a biochemical pool, so that the phenomenon of gas grabbing is effectively avoided, the use effect of a microporous aerator is ensured, the setting cost is reduced, the energy consumption is reduced, the realization of fluidization can be ensured, and the service life of the MBBR filler area is prolonged. And the development and progress of the industry are well promoted.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment, specifically to a wastewater treatment process that utilizes density flow to achieve self-flowing of packing material. Background Technology

[0002] The MBBR process has been increasingly widely used in wastewater treatment systems in recent years. MBBR is a relatively advanced wastewater treatment process. It involves adding suspended packing material with many micropores to the biological treatment tank, allowing microorganisms to attach and grow, thereby further improving the removal rate of organic matter and ammonia nitrogen and improving the efficiency of biological treatment. It is of great significance for dealing with complex water quality and saving construction land.

[0003] MBBR suspended packing needs to maintain a good fluidization state at all times; otherwise, the packing will accumulate on the surface, which will not only prevent microorganisms from growing and surviving, but also accelerate the aging and damage of the packing.

[0004] To achieve optimal fluidization of the packing material, the MBBR process typically employs fluidized bed aeration: perforated aeration pipes are installed at the bottom of the biological treatment tank, near the microporous aerators, through which compressed air is transported and discharged, causing the packing material to continuously tumble and flow with the wastewater, thus achieving fluidization. However, in actual production, this fluidization method has a critical problem—high aeration energy consumption.

[0005] Compressed air is supplied by a blower. The compressed air consumed by fluidized bed aeration means that the blower needs to consume electrical energy. The theoretical air consumption of MBBR accounts for approximately 5% of the total aeration volume of the entire biological treatment tank.

[0006] However, in reality, because the fluidized bed aeration pipe is installed higher than the microporous aeration pipe, and the exhaust port of the fluidized bed aeration pipe is larger than the opening of the microporous aeration device, the fluidized bed aeration pipe exhibits a significant "air grabbing" phenomenon. A large amount of gas escapes from the fluidized bed aeration pipe, thus reducing the effectiveness of microporous aeration. To ensure the air volume for microporous aeration, it is necessary to increase the air supply of the blower. This results in a higher aeration energy consumption for the entire biological treatment tank (an increase of at least 3%), and the aeration volume of fluidized bed aeration will exceed the theoretical value by 5% (approximately 6-8%).

[0007] Furthermore, for pollutant removal, the air volume of microporous aeration in the biological treatment tank is sufficient; fluidized aeration merely maintains the fluidized state of the packing material, which is actually redundant for pollutant removal. In other words, compared to conventional biological treatment tank processes, the MBBR process increases aeration energy consumption by 4-6%. Taking a wastewater treatment plant with a capacity of 100,000 tons / day as an example, based on the industry average aeration energy consumption of 0.07 kWh / ton of water, this would result in an annual increase in energy consumption of 100,000-150,000 kWh.

[0008] How to leverage the advanced nature of the MBBR process while reducing energy consumption has been a goal that the water industry has been exploring. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this application provides a wastewater treatment process that utilizes density flow to achieve self-fluidization of packing material. This eliminates the need for perforated aeration pipes in the MBBR packing area of ​​the biological treatment tank, effectively preventing the "air grabbing" phenomenon and ensuring the performance of the microporous aerator. This reduces installation costs and energy consumption while ensuring fluidization, thus greatly promoting the development and progress of the industry.

[0010] A wastewater treatment process utilizing density flow to achieve self-fluxing of packing material is implemented in the packing zone of an existing biological treatment tank with microporous aerators at the bottom, and includes the following process steps: (1) Divide the MBBR packing area into area A and area B; Zone A is the first section of the MBBR packing zone, and Zone B is the remaining part of the MBBR packing zone; The area of ​​region A is 1 / 3 to 1 / 4 of the area of ​​the MBBR packing region; (2) Close all microporous aerators in Zone A.

[0011] Furthermore, the process steps also include: (3) the microporous aerator in area A is turned on intermittently.

[0012] Preferably, all microporous aerators in Zone A are equipped with electric valves on their air supply pipes.

[0013] Preferably, the electric valve is connected to a time relay or a central controller; the time relay or the central controller can remotely control the opening or closing of the electric valve.

[0014] Preferably, the electric valve is opened for 10 minutes each time.

[0015] Preferably, the electric valve is closed for no more than 3 hours each time.

[0016] Compared with the prior art, the embodiments of this application have the following beneficial effects: This invention eliminates the need for perforated aeration pipes in the MBBR packing zone of the biological treatment tank, effectively avoiding the phenomenon of "air grabbing" and ensuring the performance of the microporous aerator. This reduces installation costs, lowers energy consumption, and ensures fluidization, thus greatly promoting the development and progress of the industry.

[0017] Some of the additional features of this application can be further described in the following description. By examining the following description and corresponding drawings, or by understanding the operation and training process of the embodiments, those skilled in the art can clearly recognize some of the additional technical effects proposed in this application. The features disclosed in this application can be implemented and obtained through the practice of various construction methods, training processes, and combinations of different modules, strategies, and structures in specific embodiments. Attached Figure Description

[0018] The accompanying drawings, which are provided to further illustrate this application and constitute a part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute a limitation thereof. In the drawings, the same reference numerals denote the same components. Figure 1 This is a partition diagram of the MBBR packing region of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] It should be noted that if the terms "first," "second," etc., are used in the specification, claims, and accompanying drawings of this application, they are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] In this application, when terms such as "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" are used, they indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, in this application, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Example 1 A wastewater treatment process utilizing density flow to achieve self-fluxing of packing material is implemented in the packing zone of an existing biological treatment tank with microporous aerators at the bottom, and includes the following process steps: (1) Divide the MBBR packing area into the following sections: Figure 1 Areas A and B are shown; Zone A is the first section of the MBBR packing zone, and Zone B is the remaining part of the MBBR packing zone; Zone A is typically the inlet side of the MBBR packing zone, and Zone B is typically the outlet side. The inlet structure connected to the front of the inlet side can be a conventional inlet structure such as an inlet or a weir, while the outlet structure connected to the rear of the outlet side can be a conventional outlet structure with filtration function such as a perforated plate or a screen. Both the inlet and outlet structures are existing technologies, and their setup and implementation are well known to those skilled in the art. Those skilled in the art can flexibly adjust and replace them according to actual setup needs, and will not elaborate further here.

[0026] The area of ​​region A is 1 / 3 to 1 / 4 of the area of ​​the MBBR packing region; (2) Close all microporous aerators in Zone A.

[0027] The principle behind this process is as follows: If all liquids have the same density, the liquid in the container will always remain calm. However, if the density of the liquid at one end of the container (hereinafter referred to as "zone 1") is increased while the density of the liquid at the other end (hereinafter referred to as "zone 2") remains unchanged, then the liquid in the container will exhibit the following flow pattern: because the liquid in zone 1 has a relatively higher density, it will flow from the bottom of zone 1 into zone 2 under the influence of gravity; while the liquid in zone 2 will flow from the top towards zone 1 under the pushing force of the water flowing into zone 1.

[0028] Based on the above principles, the implementation process of this embodiment is as follows: Because all the microporous aerators in zone A were shut down, the wastewater there became denser due to the absence of the large number of air bubbles present during aeration. Meanwhile, the wastewater in zone B, which continued to aerate, had a lower density due to the presence of numerous air bubbles. Wastewater entering zone A from zone B regained its density as the air bubbles disappeared; wastewater entering zone B decreased its density again due to the reintroduction of air bubbles. This cycle repeated, thus creating the density flow effect of the wastewater in the MBBR packing zone.

[0029] Example 2 This embodiment adds a step to the previous embodiment: (3) the microporous aerator in area A is turned on intermittently.

[0030] The reason for adding this step is: If zone A remains unaerated, the activated sludge in this zone will slowly settle to the bottom of the biological treatment tank, which is detrimental to the biological treatment of wastewater. Therefore, it is necessary to intermittently turn on the microporous aerator to ensure that the activated sludge in the zone does not settle.

[0031] All microporous aerators in Zone A are equipped with electric valves on their air supply pipes.

[0032] The electric valve is connected to a time relay or a central controller; the time relay or the central controller can remotely control the opening or closing of the electric valve.

[0033] Setting up an electric valve and remotely controlling its opening or closing via a time relay or central controller are both existing technologies in the field. Those skilled in the art can complete the above-mentioned setup without inventive effort, and therefore will not be elaborated upon here. Furthermore, both the time relay and the central controller can be set to open and close at set times, and once set, the intermittent opening and closing of the electric valve can be achieved automatically without manual intervention.

[0034] The electric valve is opened for 10 minutes each time.

[0035] Under normal circumstances, a 10-minute opening time for the electric valve is sufficient to ensure that the activated sludge is "lifted up" and prevents it from settling.

[0036] The electric valve is closed for no more than 3 hours at a time.

[0037] The closing time of the electric valve can be adjusted according to actual needs. The required closing time of the electric valve will also vary for different sizes of MBBR packing zones. The benchmark is that the settled activated sludge does not undergo anaerobic digestion. Generally, if it exceeds 3 hours, the activated sludge will settle and undergo anaerobic digestion. Therefore, the closing time of the electric valve each time needs to be controlled within 3 hours.

[0038] Compared to existing technologies, the process presented in this embodiment exhibits a significant fluidization effect on the packing material, with virtually no negative impact on pollutant removal. Because this process is simple to operate and highly effective, it can be widely applied in all MBBR processes and has promising application prospects.

[0039] It should be noted that all features disclosed in this specification, or all steps in all methods or processes disclosed, may be combined in any way, except for mutually exclusive features and / or steps.

[0040] Furthermore, the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this invention, and these solutions all fall within the scope of this invention and its protection. Those skilled in the art should understand that this specification and its accompanying drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this invention is defined by the claims and their equivalents.

Claims

1. A wastewater treatment process utilizing density flow to achieve self-flowing of packing material, implemented in the MBBR packing zone of an existing biological treatment tank with microporous aerators at the bottom, characterized in that, The process includes the following steps: (1) Divide the MBBR packing area into area A and area B; Zone A is the first section of the MBBR packing zone, and Zone B is the remaining part of the MBBR packing zone; The area of ​​region A is 1 / 3 to 1 / 4 of the area of ​​the MBBR packing region; (2) Close all microporous aerators in Zone A.

2. The wastewater treatment process for achieving self-flowing of packing material using density flow according to claim 1, characterized in that, The process steps also include: (3) the microporous aerator in area A is turned on intermittently.

3. The wastewater treatment process for achieving self-flowing of packing material using density flow according to claim 2, characterized in that, All microporous aerators in Zone A are equipped with electric valves on their air supply pipes.

4. A wastewater treatment process for achieving self-flowing of packing material using density flow according to claim 3, characterized in that, The electric valve is connected to a time relay or a central controller; the time relay or the central controller can remotely control the opening or closing of the electric valve.

5. A wastewater treatment process for achieving self-flowing of packing material using density flow according to claim 4, characterized in that, The electric valve is opened for 10 minutes each time.

6. A wastewater treatment process for achieving self-flowing of packing material using density flow according to claim 5, characterized in that, The electric valve is closed for no more than 3 hours at a time.

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