Sewage treatment plant

Abstract

The utility model discloses a sewage treatment device, include: aeration zone for carrying out biochemical treatment to sewage, its upper portion is equipped with the water inlet groove, sludge sedimentation area is connected with aeration zone through the communication pipe of bottom setting, is used for solid -liquid separation to sludge water mixed solution, its upper portion is equipped with the water outlet groove, gas lift device, its inlet is set in the bottom of sludge sedimentation area, and the export is set in the top of sludge sedimentation area, cyclone system, its feed inlet is connected with the export of gas lift device, is used for separating sludge water mixed solution from gas lift device, wherein, the underflow export of cyclone system is connected with aeration zone, is used for the high density biological active mixture separated from sludge water mixed solution backflow to aeration zone.

Description

Technical Field

[0001] This utility model relates to a sewage treatment device. Background Technology

[0002] Integrated wastewater treatment equipment based on the activated sludge process is widely used in the treatment of domestic sewage, rural sewage, and small- and medium-sized industrial organic wastewater. To improve treatment efficiency, existing technologies have developed sludge-film composite processes that combine the activated sludge process with the biofilm process. While this improves treatment load and stability to some extent, it often uses plastic packing as the biofilm carrier, which poses risks such as easy packing material accumulation, breakage and wear, and potential microplastic pollution. Another approach proposes using powdered activated carbon (PAC) as a microbial carrier. PAC has a large specific surface area and good fluidization and mass transfer performance, which can significantly enhance treatment efficiency and avoid microplastic problems. However, the bottleneck of this technology lies in the difficulty of PAC carrier recovery, short hydraulic retention time, resulting in significant loss with excess sludge, low utilization rate, and high costs for carbon replenishment and operation.

[0003] Therefore, there is an urgent need to develop an integrated wastewater treatment device that can efficiently recover powdered activated carbon carriers, reduce operating costs, occupy a small area, and is easy to operate. Utility Model Content

[0004] To address the above problems, the first aspect of this utility model proposes a wastewater treatment device, characterized by comprising: an aeration zone for biochemical treatment of wastewater, with an inlet tank at its upper part; a sludge settling zone, connected to the aeration zone via a connecting pipe at its bottom, for solid-liquid separation of a sludge-water mixture, with an outlet tank at its upper part; an air-lift device, with its inlet located at the bottom of the sludge settling zone and its outlet located at the top of the sludge settling zone; and a hydrocyclone system, with its inlet connected to the outlet of the air-lift device, for separating the sludge-water mixture from the air-lift device; wherein the underflow outlet of the hydrocyclone system is connected to the aeration zone for returning the high-density biologically active mixture separated from the sludge-water mixture to the aeration zone.

[0005] The wastewater treatment device according to this utility model may have one or more of the following features.

[0006] According to one embodiment, the air-lift device is a first air-lift device, which is used to allow the sludge-water mixture at the bottom of the sludge settling zone to enter the hydrocyclone system under the action of air-lift; wherein, the wastewater treatment device further includes a second air-lift device, which is used to return sludge from the bottom of the sludge settling zone to the aeration zone, the inlet of the second air-lift device is located at the bottom of the sludge settling zone, and the outlet of the second air-lift device is connected to the upper part of the aeration zone.

[0007] According to one embodiment, the first air-lift device and the second air-lift device are respectively disposed on opposite sidewalls of the sludge settling zone. The first air-lift device is disposed on the sidewall of the sludge settling zone near the aeration zone, and the second air-lift device is disposed on the sidewall of the sludge settling zone away from the aeration zone.

[0008] According to one embodiment, the air-lift device includes two first air-lift devices and two second air-lift devices. The two first air-lift devices are arranged in parallel on the side wall of the sludge settling zone near the aeration zone, and the two second air-lift devices are arranged in parallel on the side wall of the sludge settling zone away from the aeration zone.

[0009] According to one embodiment, the hydrocyclone system includes: a hydrocyclone body; an inlet and a feed pipe, the hydrocyclone body being connected to the outlet of a first air-lift device via the feed pipe and the inlet; an overflow port and an overflow pipe, the hydrocyclone body being connected to the effluent tank via the overflow pipe and the overflow port for discharging separated light sludge; and an underflow port and an underflow pipe, the hydrocyclone body being connected to the aeration zone via the underflow pipe and the underflow port for recycling the high-density biologically active mixture back to the aeration zone.

[0010] According to one embodiment, the hydrocyclone system further includes an underflow port support and an underflow sleeve located at the bottom of the hydrocyclone body, the underflow port being connected to the underflow sleeve via the underflow port support.

[0011] According to one embodiment, the hydrocyclone system further includes a sludge pump, the inlet of which is connected to the bottom of the sludge settling zone, and the outlet of which is connected to the feed inlet of the hydrocyclone system, for pumping the mud-water mixture at the bottom of the sludge settling zone to the hydrocyclone system.

[0012] According to one embodiment, the wastewater treatment device further includes a bypass pipe, the inlet of which is connected to the inlet tank and the outlet of which is connected to the outlet tank, for use in allowing the influent to bypass the aeration zone and sludge sedimentation zone and be discharged directly when the water quality or quantity changes exceed a threshold.

[0013] According to one embodiment, the outlet tank is also connected to a nitrification liquid return pipe, the outlet of which is connected to the inlet tank of the aeration zone, for returning the nitrification liquid to the inlet tank to enhance denitrification.

[0014] According to one embodiment, the wastewater treatment device further includes a carbon powder dosing system, the outlet of which is connected to the aeration zone for adding powdered activated carbon carrier into the aeration zone.

[0015] This disclosure utilizes an air-lift device for material transport, reducing the use of traditional pumps and lowering energy consumption and operating costs. Simultaneously, a hydrocyclone system enables the efficient recovery and reuse of the powdered activated carbon carrier, improving carrier utilization and significantly reducing operating costs. The entire device features an integrated design, a compact structure, a small footprint, and is easy to transport and install. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments of this utility model will be briefly described below. The drawings are merely illustrative of some embodiments of this utility model and are not intended to limit the scope of all embodiments of this utility model.

[0017] Figure 1 This is a front-view schematic diagram of the wastewater treatment device according to the present invention;

[0018] Figure 2 This is a top view schematic diagram of the wastewater treatment device according to the present invention;

[0019] Figure 3 This is a side view schematic diagram of the wastewater treatment device according to the present invention;

[0020] Figure 4 This is a schematic diagram of the hydrocyclone in the wastewater treatment device according to this utility model;

[0021] Figure 5 This is a schematic diagram of the operation of the wastewater treatment device according to this utility model;

[0022] Figure 6 This is a schematic diagram of the operation of a sewage treatment device with a sludge pump according to the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0025] The present invention will be described in detail below by way of example embodiments.

[0026] Figure 1 This is a front-view schematic diagram of the wastewater treatment device according to the present invention; Figure 2 This is a top view schematic diagram of the wastewater treatment device according to the present invention; Figure 3 This is a side view schematic diagram of the wastewater treatment device according to the present invention.

[0027] like Figures 1 to 3 As shown, this embodiment provides a wastewater treatment device, which mainly includes an aeration zone 1, a sludge sedimentation zone 2, an air lift device, and a hydrocyclone system 7.

[0028] Aeration zone 1 is used for the biological treatment of wastewater, and an inlet tank 4 is located at its upper part. Aeration zone 1 has a right-angled trapezoidal structure and is equipped with aeration devices (including aeration pipes 122 and aeration heads 123) and a stirring device 13. A screen 15 is installed in the inlet tank 4 to intercept impurities in the wastewater. The inlet tank 4 is also equipped with multiple interfaces, including a wastewater inlet, an bypass pipe, and a nitrification liquid return pipe.

[0029] The sludge settling zone 2 is used for solid-liquid separation of the sludge-water mixture. It adopts an inverted trapezoidal structure that is wider at the top and narrower at the bottom. The upper part of the zone has an outlet trough 5, which includes an outlet pipe, a baffle plate 17, a nitrification liquid return pipe 10, and a bypass pipe 9. The sludge settling zone 2 is interconnected with the aeration zone 1 via a connecting pipe 3 at the bottom, allowing the biochemically treated sludge-water mixture to enter the settling zone from the aeration zone 1. The number of connecting pipes can be three, or other numbers. An inclined pipe 16 is installed in the settling zone to block upward-moving sludge, causing it to fall back to the bottom of the sludge settling zone 2, thereby accelerating the solid-liquid separation process. The inlet of the bypass pipe 9 is connected to the inlet trough 4, and the outlet of the bypass pipe 9 is connected to the outlet trough 5. This allows the influent to bypass the aeration zone 1 and the sludge settling zone 2 and be discharged directly when changes in water quality or quantity exceed a threshold. The outlet of the nitrification liquid return pipe 10 is connected to the inlet tank 4 of the aeration zone 1, and is used to return the nitrification liquid to the inlet tank to enhance denitrification.

[0030] The airlift device uses compressed air supplied by the blower 121 to generate an airlift effect, forming a gas-liquid mixed flow, thereby lifting and conveying the sludge-water mixture from the bottom of the sedimentation zone. The airlift device includes a first airlift device 61 (also called an airlift sludge discharge pipe) and a second airlift device 62 (also called an airlift sludge return pipe). The first airlift device 61 is used to allow the sludge-water mixture at the bottom of the sludge sedimentation zone 2 to enter the hydrocyclone system 7 under the action of airlift. The inlet 611 of the first airlift device 61 is located at the bottom of the sludge sedimentation zone 2 to extract the sludge-water mixture at the bottom of the sedimentation zone, and its outlet 612 is located at the top of the sludge sedimentation zone 2. The second airlift device 62 is used to return the sludge at the bottom of the sludge sedimentation zone 2 to the aeration zone 1. The inlet 621 of the second airlift device 62 is located at the bottom of the sludge sedimentation zone 2, and the outlet 622 of the second airlift device 62 is connected to the upper part of the aeration zone 1.

[0031] The airlift process enables sludge recirculation, nitrification liquor recirculation, discharge of excess sludge, and hydrocyclone feeding, reducing the use of conveying pumps and the number of equipment, lowering energy consumption and equipment construction costs, and simplifying the operation process.

[0032] like Figures 1 to 3 As shown, the first air-lift device 61 and the second air-lift device 62 are respectively installed on opposite side walls of the sludge settling zone 2. The first air-lift device 61 is installed on the side wall of the sludge settling zone 2 near the aeration zone 1, and the second air-lift device 62 is installed on the side wall of the sludge settling zone 2 away from the aeration zone 1.

[0033] like Figure 2 As further shown in the top view, the air-lift device includes two first air-lift devices 61 and two second air-lift devices 62. The two first air-lift devices 61 are arranged in parallel on the side wall of the sludge settling zone 2 near the aeration zone 1, and the two second air-lift devices 62 are arranged in parallel on the side wall of the sludge settling zone 2 away from the aeration zone 1.

[0034] Figure 4 This is a schematic diagram of the hydrocyclone of the wastewater treatment device according to this utility model.

[0035] like Figure 4 As shown, the inlet 72 of the hydrocyclone system 7 is connected to the outlet of the first air-lift device 61, used to separate the mud-water mixture from the bottom of the sludge settling zone 2. The hydrocyclone system 7, based on the principle of material density difference, separates the mud-water mixture under centrifugal force. This hydrocyclone system 7 can be a hydrocyclone. The hydrocyclone causes the powdered activated carbon carrier and relatively dense sludge to settle under centrifugal force, discharged through the underflow outlet and returned to the aeration zone 1 of the device for recycling. Lighter and flocculent sludge, a small amount of powdered activated carbon fragments, other fine particulate impurities, and inorganic ash, are subjected to less centrifugal force and are located in the central area of ​​the hydrocyclone separator, forming an upward low-pressure vortex, which is discharged through the overflow outlet 74 and drained away through the device's drain outlet. Specifically, as... Figure 4 As shown, the hydrocyclone system 7 includes a hydrocyclone and associated pipes and instruments. The hydrocyclone includes a hydrocyclone body 71, a feed inlet 72, an overflow outlet 74, and a bottom outlet 76. The hydrocyclone body 71 is connected to the outlet of the first air-lift device 61 via the feed pipe 73 and the feed inlet 72. The feed flow rate and pressure are controlled by a pressure gauge 701, a flow meter 702, and a ball valve 703 on the pipe. The hydrocyclone body 71 is connected to the effluent tank 5 via the overflow pipe and the overflow outlet 74 for discharging the separated waste. The overflow pipe further includes an overflow bend 751 and an overflow sleeve 752, wherein the diameter of the overflow sleeve 752 is larger than that of the overflow bend 751. The upper opening of the overflow sleeve 752 is connected to the atmosphere, and the lower part collects into the overflow collection pipe 753. The hydrocyclone body 71 is connected to the aeration zone 1 via the bottom outlet 76 through the bottom outlet 76 for recycling the high-density biologically active mixture back to the aeration zone 1. The hydrocyclone system 7 also includes an underflow port support 763 and an underflow sleeve 761 located at the bottom of the hydrocyclone body 71. The underflow port is connected to the underflow sleeve 761 via the underflow port support 763. The underflow port 76 is connected to the underflow port support 763 via the underflow sleeve 761. The underflow port support 763 is located at the bottom of the hydrocyclone body 71 to support and fix the hydrocyclone body 71. The diameter of the underflow sleeve 761 is also larger than that of the underflow port 76, and its lower part collects the underflow into the underflow collection pipe 762. The hydrocyclone system 7 can realize the recovery of powdered activated carbon carrier and the concentration and screening of sludge, reduce the loss of powdered activated carbon carrier, and reduce operating costs.

[0036] The wastewater treatment device also includes a carbon powder dosing system 11, whose outlet is connected to the aeration zone 1, for adding powdered activated carbon carriers into the aeration zone 1. By adding powdered activated carbon carriers to the activated sludge in the device, a sludge-film coupling system is constructed, namely, activated sludge and a biofilm attached to the surface of the powdered activated carbon carrier. This increases the amount of microorganisms in the device and improves their activity, thereby enhancing the biological treatment capacity of wastewater, strengthening the efficiency of biological nitrogen and phosphorus removal, improving effluent quality, and increasing the system's resistance to shock loads and operational stability. In addition, using powdered activated carbon carriers instead of traditional suspended plastic packing can also avoid the problems of localized packing accumulation, packing breakage and wear, and microplastic pollution that often occur with plastic packing.

[0037] In addition, an electrical box or control cabinet 14 is also installed in the space below the outside of the sludge settling zone 2.

[0038] Figure 5 This is a schematic diagram of the operation of the wastewater treatment device according to this utility model.

[0039] The following joints Figure 5 The operation of a wastewater treatment device according to an embodiment of this disclosure is described. The influent flow rate into this frame-type biochemically enhanced integrated wastewater treatment device is regulated by an external influent pump and flow meter. The device can operate continuously for 24 hours. Aeration and stirring alternate in aeration zone 1 (e.g., the switching time interval is set to 2.5 hours of aeration followed by 1.5 hours of stirring). Stirring is not required during aeration, and aeration stops during stirring, thus creating an alternating aerobic-anoxic operating condition. Therefore, the device can switch between anoxic and aerobic functions within the same area, eliminating the need for separate anoxic and aerobic zones and saving space. Aeration zone 1 and sludge sedimentation zone 2 are connected by a bottom connecting pipe 3. After biochemical treatment, the wastewater enters sludge sedimentation zone 2 from aeration zone 1, where solid-liquid separation occurs under the action of inclined pipe 16. Sludge and powdered activated carbon carrier are deposited at the bottom of sludge sedimentation zone 2, and the clear liquid flows through inclined pipe 16 and enters effluent tank 5 for discharge. When significant changes in water quality or quantity occur, wastewater can be directly discharged from effluent tank 5 through bypass pipe 9. The return flow rates of sludge and nitrification liquor are controlled by blower 121. A sludge pump 8 is added at the bottom of the sludge settling zone 2. The sludge and carrier mixture is pumped to the inlet 72 of the hydrocyclone system 7 by pump 8. The flow rate and pressure entering the hydrocyclone are controlled by the valve opening, thereby controlling the separation effect of the hydrocyclone. The light, flocculent sludge and a small amount of powdered activated carbon discharged from the overflow port 74 of the hydrocyclone system 7 are discharged through the effluent tank 5. The powdered activated carbon carrier and dense sludge discharged from the underflow port 76 are returned to the aeration zone 1. The recovery rate of powdered activated carbon carrier by the hydrocyclone can reach over 80%.

[0040] Figure 6 This is an operational schematic diagram of an embodiment of the wastewater treatment device with sludge pump 8 according to the present invention.

[0041] like Figure 6 As shown, when higher separation requirements are needed, a sludge pump 8 can be additionally installed to improve the separation efficiency of the hydrocyclone system 7. The inlet of the sludge pump 8 is connected to the bottom of the sludge settling zone 2, and the outlet of the sludge pump 8 is connected to the feed inlet 72 of the hydrocyclone system 7, used to pump the mixed liquid at the bottom of the sludge settling zone 2 to the hydrocyclone system 7.

[0042] The following joints Figure 6 The operation process of a wastewater treatment apparatus according to one embodiment of this disclosure is described herein. For the sake of brevity, only the operation of the apparatus is described here. Figure 5 The difference in the operation process of the embodiment is that a sludge pump 8 is added at the bottom of the sludge settling zone 2, and the sludge and carrier mixture is pumped to the feed port 72 of the hydrocyclone system 7 by the sludge pump 8.

[0043] As shown in the attached diagram, the device disclosed herein has a frame structure, which facilitates design scaling up to accommodate different processing capacities, resulting in a series of products. It is also easy to install and use; it only requires overall transportation and hoisting, and operation can begin after on-site connection to power and inlet / outlet water pipes.

[0044] This disclosure utilizes an air-lift device for material transport, reducing the use of traditional pumps and lowering energy consumption and operating costs. Simultaneously, the hydrocyclone system 7 enables efficient recovery and reuse of the powdered activated carbon carrier, improving carrier utilization and significantly reducing operating costs. The entire device features an integrated design, a compact structure, a small footprint, and facilitates transportation and installation.

[0045] The exemplary embodiments of the wastewater treatment device proposed by the present invention have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention.

Claims

1. A wastewater treatment device, characterized in that, include: The aeration zone (1) is used for biochemical treatment of sewage, and an inlet tank (4) is provided at its top. The sludge sedimentation zone (2) is connected to the aeration zone (1) through a connecting pipe (3) at the bottom, and is used for solid-liquid separation of the sludge-water mixture. A water outlet trough (5) is provided at the top of the zone. The first air-lift device (61) has its inlet (611) located at the bottom of the sludge settling zone (2) and its outlet (612) located at the top of the sludge settling zone (2). The second air-lift device (62) has its inlet (621) located at the bottom of the sludge settling zone (2) and its outlet (622) connected to the upper part of the aeration zone (1). The hydrocyclone system (7), whose inlet (72) is connected to the outlet (612) of the air-lift device, is used to separate the mud-water mixture from the air-lift device; The underflow outlet of the hydrocyclone system (7) is connected to the aeration zone (1) for returning the high-density biologically active mixture separated from the mud-water mixture to the aeration zone (1). The first air-lift device (61) is used to allow the sludge-water mixture at the bottom of the sludge settling zone (2) to enter the hydrocyclone system (7) under air-lift action, and the second air-lift device (62) is used to return the sludge at the bottom of the sludge settling zone (2) to the aeration zone (1); and The hydrocyclone system (7) includes: Hydrocyclone body (71); The hydrocyclone body (71) is connected to the outlet (612) of the first air-lift device (61) via the feed pipe (73) and the feed inlet (72); An overflow port (74) and an overflow pipe, wherein the hydrocyclone body (71) is connected to the outlet tank (5) via the overflow pipe and the overflow port (74) for discharging the separated light sludge; and The underflow port (76) and underflow pipe, the hydrocyclone body (71) is connected to the aeration zone (1) via the underflow port (76) through the underflow pipe, for recycling the high-density bioactive mixture back to the aeration zone (1).

2. The wastewater treatment device according to claim 1, characterized in that, The first air-lift device (61) and the second air-lift device (62) are respectively disposed on opposite side walls of the sludge settling zone (2). The first air-lift device (61) is disposed on the side wall of the sludge settling zone (2) near the aeration zone (1), and the second air-lift device (62) is disposed on the side wall of the sludge settling zone (2) away from the aeration zone (1).

3. The wastewater treatment device according to claim 2, characterized in that, The air-lift device includes two first air-lift devices (61) and two second air-lift devices (62). The two first air-lift devices (61) are arranged in parallel on the side wall of the sludge sedimentation zone (2) near the aeration zone (1), and the two second air-lift devices (62) are arranged in parallel on the side wall of the sludge sedimentation zone (2) away from the aeration zone (1).

4. The wastewater treatment device according to claim 1, characterized in that, The hydrocyclone system (7) also includes an underflow port support (763) and an underflow sleeve (761) located at the bottom of the hydrocyclone body (71), the underflow port being connected to the underflow sleeve (761) via the underflow port support (763).

5. The wastewater treatment device according to claim 1, characterized in that, The hydrocyclone system (7) also includes a sludge pump (8), the inlet of which is connected to the bottom of the sludge settling zone (2), and the outlet of which is connected to the feed inlet (72) of the hydrocyclone system (7), for pumping the mud-water mixture at the bottom of the sludge settling zone (2) to the hydrocyclone system (7).

6. The wastewater treatment device according to claim 1, characterized in that, The wastewater treatment device also includes a bypass pipe (9), the inlet of which is connected to the inlet tank (4) and the outlet of which is connected to the outlet tank (5), for use to allow the inlet water to bypass the aeration zone (1) and the sludge sedimentation zone (2) and be discharged directly when the water quality or water quantity changes beyond the threshold.

7. The wastewater treatment device according to claim 1, characterized in that, The outlet tank (5) is also connected to a nitrification liquid return pipe (10), the outlet of which is connected to the inlet tank (4) of the aeration zone (1) to return the nitrification liquid to the inlet tank to enhance denitrification.

8. The wastewater treatment device according to claim 1, characterized in that, It also includes a carbon powder dosing system (11), whose outlet is connected to the aeration zone (1) for adding powdered activated carbon carrier into the aeration zone (1).

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