Load-adjustable rural sewage operation device

Abstract

This invention relates to the field of wastewater treatment technology and discloses a load-regulating rural wastewater treatment operation device. It includes a rectangular box structure composed of an anaerobic zone, an anoxic zone, an aerobic zone, a reoxygenated water zone, and a sedimentation zone. Flow holes are provided between the anaerobic, anoxic, and aerobic zones. The aerobic zone is connected to the sedimentation zone via a bypass pipe equipped with a bypass valve. The reoxygenated water zone is connected to the sedimentation zone via a reoxygenated water zone outlet pipe. The aerobic zone returns nitrified liquid to the anoxic zone via a pipeline equipped with an internal return pump. The sedimentation zone returns sludge to the anaerobic zone via a pipeline equipped with a sludge return pump. This invention effectively reduces energy consumption in rural wastewater treatment and alleviates problems such as poor effluent quality stability under load fluctuations due to significant seasonal variations.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a load-regulating rural wastewater operation device. Background Technology

[0002] Rural wastewater treatment faces challenges such as insufficient operating funds and significant seasonal variations leading to prolonged low-load operation. This prolonged low-load operation results in excessively low total organic matter in the influent, hindering the cultivation and acclimatization of microorganisms, causing microbial aging, and ultimately affecting effluent quality. Consequently, various operating modes and parameter settings differ significantly from normal conditions, preventing rural domestic wastewater treatment projects from fulfilling their intended purpose. Furthermore, most existing integrated equipment utilizes the plug-flow activated sludge process, commonly employing anaerobic / anoxic / aerobic methods. Typically presented as single integrated units, the limited size of aeration equipment prevents variable frequency control, resulting in high aeration rates even at low loads. This not only leads to high energy consumption but also high dissolved oxygen levels in the effluent mixed liquor. When the mixed liquor is 100% recycled, this high dissolved oxygen is carried back to the anoxic tank, causing high ORP in the anoxic tank, making it difficult to create an anoxic environment, inhibiting denitrification, and ultimately worsening the total nitrogen content of the effluent.

[0003] The existing integrated rural sewage treatment equipment has the disadvantages of high energy consumption and inflexible operation. Therefore, it is necessary to propose a load-regulating rural sewage operation device to solve the above problems. Summary of the Invention

[0004] In order to solve a series of problems such as high energy consumption and inflexible operation of existing integrated rural sewage treatment equipment, which prevent rural domestic sewage treatment projects from playing their due role, this invention provides a load-regulating rural sewage operation device.

[0005] This invention provides a load-regulating rural wastewater operation device, comprising a rectangular box structure consisting of an anaerobic zone, an anoxic zone, an aerobic zone, a reoxygenated water zone, and a sedimentation zone. Flow holes are provided between the anaerobic zone, the anoxic zone, and the aerobic zone. The aerobic zone is connected to the sedimentation zone via a bypass connecting pipe, and a bypass connecting valve is installed on the bypass connecting pipe. The reoxygenated water zone is connected to the sedimentation zone via a reoxygenated water zone outlet pipe. The aerobic zone returns nitrified liquid to the anoxic zone through a pipeline equipped with an internal return pump, and the sedimentation zone returns sludge to the anaerobic zone through a pipeline equipped with a sludge return pump.

[0006] During implementation, a rectangular box structure consisting of an anaerobic zone, an anoxic zone, an aerobic zone, a reoxygenated water zone, and a sedimentation zone is used. Each zone is independent, and the anaerobic zone, anoxic zone, aerobic zone, and reoxygenated water zone are separated by partitions. The volume ratio of the anaerobic zone, anoxic zone, aerobic zone, and reoxygenated water zone is 4:4:12:1. Flow holes are provided between the anaerobic zone, anoxic zone, and aerobic zone, and adjacent zones are connected through flow holes. The aerobic zone is connected to the sedimentation zone through a bypass connecting pipe, and a bypass connecting valve is installed on the bypass connecting pipe. The reoxygenated water zone is connected to the sedimentation zone through a reoxygenated water zone outlet pipe. The aerobic zone returns nitrified liquid to the anoxic zone through a pipeline equipped with an internal return pump, and the sedimentation zone returns sludge to the anaerobic zone through a pipeline equipped with a sludge return pump.

[0007] Furthermore, both the anaerobic and anoxic zones are equipped with agitators, and a reoxygenation water return distribution pipe is installed at the bottom of the anoxic zone.

[0008] Furthermore, an aerobic zone microporous aerator and an aerobic zone air distribution pipe are installed at the bottom of the aerobic zone. An aerobic zone reoxygenated water return distribution pipe is set at the bottom of the aerobic zone and connected to the anoxic zone reoxygenated water return distribution pipe. Aeration is carried out in the aerobic zone by a blower.

[0009] Furthermore, the reoxygenated water zone is equipped with a microporous aerator, an air distribution pipe, a cascading drainage channel, cascading baffles, and a reoxygenated water return pump. Aeration in the reoxygenated water zone is achieved through a blower. The cascading drainage channel is V-shaped at 45°, with one end connected to the aerobic zone and the other end suspended above the reoxygenated water zone. The upper opening width of the cascading drainage channel is not less than 15cm, and the elevation of the cascading drainage channel is at least 1m higher than the elevation of the effluent weir in the sedimentation zone. Specifically, the shape and size of the cascading baffles are consistent with the shape and size of the reoxygenated water zone and are parallel to the water surface of the reoxygenated water zone. The elevation of the cascading baffles is at least 0.5m lower than the elevation of the cascading drainage channel and higher than the elevation of the effluent weir in the sedimentation zone. The cascading baffles are covered with water passage holes with a diameter of 1.5cm, and the hole area accounts for 30% to 50%.

[0010] Furthermore, the sedimentation zone is equipped with an effluent weir, a rectifier cylinder, and a sludge return pump; the elevation of the effluent weir is 1.2m to 1.5m below the top elevation of the load-regulating rural sewage treatment plant.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] This invention provides a load-regulating rural wastewater treatment device that adds a reoxygenation water zone between the anaerobic, anoxic, aerobic, and sedimentation zones. Water from the reoxygenation water zone is then returned to the anoxic and aerobic zones, simultaneously achieving forced aeration and external oxygen supply. This solves the problems of poor flexibility and precision in adjusting aeration pipe valves in previous small-scale integrated wastewater treatment equipment. By adjusting the operating mode, it achieves high-efficiency carbon, nitrogen, and phosphorus removal, maintains activated sludge volume, and sustains low-energy operation. This invention effectively reduces energy consumption in rural wastewater treatment and alleviates the problem of poor effluent quality stability under load fluctuations due to significant seasonal variations.

[0013] This invention sets up two aeration modes simultaneously in a rural sewage treatment plant. The aeration mode can be flexibly switched according to the fluctuations in influent flow and water quality, so as to achieve high-efficiency carbon, nitrogen and phosphorus removal performance, maintain the amount of activated sludge, and maintain low-energy operation.

[0014] This invention solves the problems of poor flexibility and accuracy in adjusting the valves of aeration pipes in previous small-scale integrated sewage treatment equipment.

[0015] This invention adds a small-volume reoxygenated water zone between the aerobic zone and the sedimentation zone without increasing the floor space, thus saving on investment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] The diagram is labeled as follows: 1-Anaerobic zone; 2-Anoxic zone; 3-Aerobic zone; 4-Reoxygenated water zone; 5-Sedimentation zone; 6-Flow hole; 7-Overpass connecting pipe; 8-Overpass connecting valve; 9-Reoxygenated water zone outlet pipe; 10-Internal return pump; 11-Sludge return pump; 12-Agitator; 13-Anoxic zone reoxygenated water return distribution pipe; 14-Aerobic zone microporous aerator; 15-Aerobic zone air distribution pipe; 16-Aerobic zone reoxygenated water return distribution pipe; 17-Reoxygenated water zone microporous aerator; 18-Reoxygenated water zone air distribution pipe; 19-Cascading diversion channel; 20-Cascading baffle; 21-Reoxygenated water return pump; 22-Outlet weir; 23-Rectifier cylinder; 24-Blower. Detailed Implementation

[0018] Specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0019] A load-regulating rural sewage treatment device, such as Figure 1As shown: A 100-ton load-regulating rural sewage treatment plant has the following volumes: anaerobic zone 1: anoxic zone 2: aerobic zone 3: reoxygenated water zone 4, with volumes of 19 tons: 19 tons: 57 tons: 5 tons, respectively. The dimensions of anaerobic zone 1 (length, width, and height) are 2.5m, 2.5m, and 3m, respectively; the dimensions of anoxic zone 2 (length, width, and height) are 2.5m, 2.5m, and 3m, respectively; the dimensions of aerobic zone 3 (length, width, and height) are 7.5m, 2.5m, and 3m, respectively; the dimensions of reoxygenated water zone 4 (length, width, and height) are 0.67m, 2.5m, and 3m, respectively; and the diameter and height of sedimentation zone 5 are 1.4m and 1.8m, respectively.

[0020] A flow passage 6 is installed between the anaerobic zone 1, the anoxic zone 2, and the aerobic zone 3. The flow passage 6 is square with a side length of 0.4m and a center height of 2.3m. A bypass connecting pipe 7 is installed between the aerobic zone 3 and the sedimentation zone 5, and a bypass connecting valve 8 is installed on the bypass connecting pipe 7. A reoxygenated water zone 4 outlet pipe 10 is installed between the reoxygenated water zone 4 and the sedimentation zone 5. The aerobic zone 3 returns the nitrified liquid to the anoxic zone 2 through the internal return pump 10. The sedimentation zone 5 returns the sludge to the anaerobic zone 1 through the sludge return pump 11.

[0021] A set of agitators 12 is installed in both the anaerobic zone 1 and the anoxic zone 2. Four DN15 anoxic zone reoxygenation water return distribution pipes 13 are installed at the bottom of the anoxic zone 2. The anoxic zone reoxygenation water return distribution pipes 13 are arranged in parallel at the bottom of the anoxic zone 2 with a spacing of 0.5m.

[0022] At the bottom of aerobic zone 3, microporous aerators 14 with a diameter of 65mm are installed. The microporous aerators 14 are spaced 0.5m apart, and the surface of the microporous aerators 14 is 0.25m from the bottom of the pool. Aerobic zone 3 is equipped with air distribution pipes with a diameter of 10cm. At the bottom, there are 4 DN15 aerobic zone reoxygenated water return distribution pipes 16, which are arranged in parallel at the bottom of the anoxic zone with a spacing of 0.5m. Each aerobic zone reoxygenated water return distribution pipe 16 is located in the middle of the parallel microporous aerators 14.

[0023] Microporous aerators 17 with a diameter of 65 mm are installed in the reoxygenated water zone 4. The microporous aerators 17 are spaced 0.5 m apart, and the surface of the microporous aerators 17 is 0.25 m from the bottom of the pool. A 10 cm diameter air distribution pipe is installed in the reoxygenated water zone. The cascading drainage channel 19 is V-shaped at 45°, with one end connected to the aerobic zone and the other end suspended in the reoxygenated water zone. The upper opening width of the cascading drainage channel 19 is 15 cm, and the elevation of the cascading drainage channel 19 is 1 m higher than the elevation of the effluent weir of the sedimentation zone. A drop baffle 20 is installed above the water surface of the reoxygenated water zone 4. The shape and size of the drop baffle 20 are consistent with the shape and size of the reoxygenated water zone, with a side length of 2.5m and parallel to the water surface of the reoxygenated water zone. The elevation is 0.5m lower than the elevation of the drop diversion channel 19 and 0.3m higher than the elevation of the outlet weir of the sedimentation zone. The drop baffle 20 is covered with water passage holes with a diameter of 1.5cm and a hole area ratio of 40%.

[0024] A reoxygenated water return pump 21 is installed at the bottom of the reoxygenated water zone 4.

[0025] The sedimentation zone 5 is equipped with a triangular effluent weir and a rectifier cylinder 23, and a sludge return pump 11 is installed at the bottom; the elevation of the effluent weir is 1.2m below the top elevation of the load-regulating rural sewage operation device.

[0026] The aerobic zone air distribution pipe 15 and the reoxygenated water zone air distribution pipe 18 are connected to the blower 24 for aeration.

[0027] The scope of protection claimed by this invention is not limited to the specific embodiments described above. Moreover, for those skilled in the art, this invention can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A load-regulating rural sewage treatment operation device, characterized in that: The structure comprises a rectangular box consisting of an anaerobic zone (1), an anoxic zone (2), an aerobic zone (3), a reoxygenated water zone (4), and a sedimentation zone (5). Flow holes (6) are provided between the anaerobic zone (1), the anoxic zone (2), and the aerobic zone (3). The aerobic zone (3) is connected to the sedimentation zone (5) via a bypass connecting pipe (7), on which a bypass connecting valve (8) is installed. The reoxygenated water zone (4) is connected to the sedimentation zone (5) via a reoxygenated water zone outlet pipe (9). The aerobic zone (3) returns the nitrified liquid to the anoxic zone (2) through a pipeline equipped with an internal reflux pump (10). The sedimentation zone (5) is connected to the sedimentation zone through a pipeline equipped with an internal reflux pump (10). A pipeline equipped with a sludge return pump (11) returns sludge to the anaerobic zone (1); the volume ratio of the anaerobic zone (1), the anoxic zone (2), the aerobic zone (3), and the reoxygenated water zone (4) is 4:4:12:1; both the anaerobic zone (1) and the anoxic zone (2) are equipped with a stirrer (12), and the bottom of the anoxic zone (2) is equipped with an anoxic zone reoxygenated water return distribution pipe (13); the bottom of the aerobic zone (3) is equipped with an aerobic zone microporous aerator (14) and an aerobic zone air distribution pipe (15), and the bottom of the aerobic zone (3) is equipped with an aerobic zone reoxygenated water return distribution pipe (16). The aerobic zone (3) is ventilated by a blower. Aeration is achieved by blower (24); the reoxygenated water zone (4) is equipped with a microporous aerator (17), an air distribution pipe (18), a drop channel (19), a drop baffle (20), and a reoxygenated water return pump (21). The reoxygenated water zone (4) is aerated by blower (24); the drop channel (19) is V-shaped at 45°, with one end connected to the aerobic zone (3) and the other end suspended in the reoxygenated water zone (4). The upper opening width of the drop channel (19) is not less than 15cm, and the elevation of the drop channel (19) is at least 1m higher than the elevation of the effluent weir (22) of the sedimentation zone (5); the drop baffle The shape and size of (20) are consistent with the shape and size of the reoxygenated water zone (4) and are parallel to the water surface of the reoxygenated water zone (4); the elevation of the drop baffle (20) is at least 0.5m lower than the elevation of the drop diversion channel (19) and higher than the elevation of the outlet weir (22) of the sedimentation zone (5); the drop baffle (20) is covered with water passage holes with a diameter of 1.5cm and a hole area ratio of 30%~50%; the sedimentation zone (5) is equipped with an outlet weir (22), a rectifier cylinder (23), and a sludge return pump (11); the elevation of the outlet weir (22) is 1.2m~1.5m below the top elevation of the load-regulating rural sewage operation device.

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