Integrated small sewage treatment system with switchable modes

Abstract

The utility model discloses an integrated small sewage treatment system with switchable modes, which solves the problem that the existing sewage treatment system adopts a fixed treatment mode, and the treatment process cannot be quickly adjusted, so that the treatment effect is unstable. The device comprises a pre-anoxic zone, an anaerobic zone, a front anoxic zone, a front aerobic zone, a deoxidizing zone, a rear anoxic zone, a rear aerobic zone and an inclined tube settling zone which are communicated in sequence, a first baffle is movably arranged at the communication part between the rear anoxic zone and the rear aerobic zone, the tail end of the rear anoxic zone is connected with an MBR membrane treatment zone through a first surpassing pipe, and a first surpassing valve is arranged on the first surpassing pipe; an inclined pipe is arranged in the inclined pipe settling area, the area above the inclined pipe is connected with a disinfection area through a second surpassing pipe, and a second surpassing valve is arranged on the second surpassing pipe. According to the utility model, the use modes are flexible and diverse, different modes can be switched by matching the surpassing pipes with the corresponding baffle plates, and proper modes can be selected according to different sewage conditions, so that the purposes of high efficiency and energy conservation are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment, specifically relating to an integrated small wastewater treatment system with switchable modes. Background Technology

[0002] With the booming rural economy and steady population growth, the volume of rural domestic sewage discharge has also increased, causing continuous pollution to the rural environment. However, due to the dispersed population and scattered housing in rural areas, constructing a unified pipe network for centralized sewage treatment faces numerous difficulties, hindering the progress of rural sewage treatment. In practical applications, the quality and quantity of sewage vary significantly across different regions. Urban domestic sewage is often complex in composition, containing a large number of organic pollutants, while rural sewage may fluctuate in volume and quality due to seasonal changes. Furthermore, in special scenarios such as tourist attractions and temporary construction sites, sewage discharge is characterized by short-term concentration and large fluctuations in water quality. Existing integrated sewage treatment systems typically employ a fixed treatment mode, making it difficult to quickly adjust the treatment process according to the characteristics of the sewage, resulting in unstable treatment effects and potentially leading to substandard treatment or resource waste.

[0003] From the perspective of functional integration, traditional integrated equipment focuses on a single processing flow and lacks efficient integration of pre-processing, deep processing and other links. Utility Model Content

[0004] The purpose of this invention is to provide an integrated small-scale wastewater treatment system with switchable modes, in order to solve the problem that existing wastewater treatment systems use fixed treatment modes and cannot quickly adjust the treatment process, resulting in unstable treatment effects.

[0005] The technical solution of this utility model is: an integrated small-scale sewage treatment system with switchable modes, comprising a pre-anoxic zone, an anaerobic zone, a pre-anoxic zone, a pre-aerobic zone, a deoxygenation zone, a post-anoxic zone, a post-aerobic zone, and an inclined tube sedimentation zone connected in sequence.

[0006] A first baffle is movably installed at the connection between the post-anoxic zone and the post-aerobic zone. The end of the post-anoxic zone is connected to the MBR membrane treatment zone through a first overpass pipe. A first overpass valve is provided on the first overpass pipe.

[0007] An inclined tube is installed in the inclined tube sedimentation zone, and the area above the inclined tube is connected to the disinfection zone through a second bypass tube. A second bypass valve is installed on the second bypass tube.

[0008] As a further improvement of this utility model, the pre-hypoxia zone is composed of multiple pre-hypoxia units connected in series, a second baffle is movably provided at the connection between two adjacent pre-hypoxia units, and a third baffle is movably provided at the connection between the last two pre-hypoxia units.

[0009] A third overpass tube with a third overpass valve is provided between the last pre-anoxic unit and the pre-anoxic unit in front of the second baffle.

[0010] As a further improvement of this utility model, a first vent pipe is connected to the third overpass pipe, and a first vent valve is provided on the first vent pipe. The first vent valve and the third overpass valve are connected in parallel.

[0011] As a further improvement of this utility model, an internal reflux pipe is provided between the front end of the anterior hypoxia zone and the front end of the posterior hypoxia zone, and an internal reflux pump is provided on the internal reflux pipe.

[0012] As a further improvement of this utility model, a second vent pipe is provided on the inner reflux pipe, and a second vent valve is provided on the second vent pipe. The second vent valve and the inner reflux pump are connected in parallel.

[0013] As a further improvement of this utility model, a sludge return pipe is provided between the pre-anoxic zone and the area below the inclined tube of the inclined tube sedimentation zone, and a sludge return pump is provided on the sludge return pipe.

[0014] As a further improvement of this utility model, a third vent pipe is connected to the sludge return pipe, and a third vent valve is provided on the third vent pipe. The third vent valve and the sludge return pump are connected in parallel.

[0015] As a further improvement of this utility model, it also includes a main water inlet pipe, on which a water inlet pump is provided. A main water pipe and two branch water pipes are connected in parallel at the rear end of the water inlet pump. The main water pipe is connected to the pre-anoxic zone, and the two branch water pipes are respectively connected to the front end of the anaerobic zone and the front end of the pre-anoxic zone. A water distribution valve is provided on the branch water pipe.

[0016] As a further improvement of this utility model, the first baffle, the second baffle and the third baffle are all slidably connected to the pool wall.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model integrates wastewater treatment zones with different functions into a unified layout, which greatly reduces the floor space required and saves land resources. Since the various treatment zones are integrated into one system, it simplifies operation and management processes and reduces operating costs.

[0019] 2. This utility model has a flexible and diverse operating mode. By using each bypass pipe in conjunction with the corresponding baffle, it can be switched to different modes. The appropriate mode can be selected according to different sewage conditions to achieve high efficiency and energy saving, while meeting sewage discharge standards.

[0020] 3. This utility model has the advantages of stable operation, simple operation, and low operating cost, and has strong practicality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a partial structural schematic diagram of the pre-anoxic zone, anaerobic zone, pre-anoxic zone, pre-aerobic zone, and deoxygenation zone in this utility model;

[0023] Figure 3 This is a partial structural diagram of the post-anoxic zone, post-aerobic zone, inclined tube sedimentation zone, MBR membrane treatment zone, and disinfection zone in this utility model.

[0024] In the diagram: 1-Pre-anoxic zone; 101-Inlet pump; 102-Main water pipe; 103-Branch pipe; 104-Branch valve; 105-Main inlet pipe; 2-Anaerobic zone; 201-Anaerobic unit; 3-Pre-anoxic zone; 301-Pre-anoxic unit; 307-Outlet weir; 308-Second baffle; 309-Third baffle; 4-Pre-aerobic zone; 401-Pre-aerobic unit; 5-Deoxygenation zone; 501-Vertical corrugated plate; 6-Post-anoxic zone; 601-Post-anoxic unit; 602-First bypass valve; 603-First baffle; 604-First bypass pipe; 7-Post-anoxic zone; Aerobic Zone; 701 - Post-Aerobic Unit; 8 - Inclined Tube Sedimentation Zone; 801 - Second Overpass Valve; 803 - Inclined Tube; 805 - Second Overpass Pipe; 9 - Disinfection Zone; 901 - Effluent Pipe; 11 - Third Overpass Pipe; 1102 - First Vent Pipe; 1103 - Third Overpass Valve; 1105 - First Vent Valve; 12 - Internal Return Pipe; 1201 - Second Vent Pipe; 1202 - Internal Return Pump; 1204 - Second Vent Valve; 13 - Sludge Return Pipe; 1301 - Third Vent Pipe; 1302 - Sludge Return Pump; 1304 - Third Vent Valve; 14 - MBR Membrane Treatment Zone; 1401 - MBR Membrane Module; 1402 - Suction Pump. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings.

[0026] Example 1

[0027] like Figure 1-3 As shown, an integrated small-scale wastewater treatment system with switchable modes includes a pre-anoxic zone 1, an anaerobic zone 2, a pre-anoxic zone 3, a pre-aerobic zone 4, a deoxygenation zone 5, a post-anoxic zone 6, a post-aerobic zone 7, and an inclined tube sedimentation zone 8 connected in sequence. In this embodiment, the anaerobic zone 2 is composed of two anaerobic units 201 connected in series, the pre-anoxic zone 3 is composed of six pre-anoxic units 301 connected in series, the pre-aerobic zone 4 is composed of two pre-aerobic units 401 connected in series, the post-anoxic zone 6 is composed of two post-anoxic units 601 connected in series, and the post-aerobic zone 7 is composed of two post-aerobic units 701 connected in series.

[0028] A first baffle 603 is movably installed at the connection between the post-anoxic zone 6 and the post-aerobic zone 7. The end of the post-anoxic zone 6 (i.e., the second post-anoxic unit 601) is connected to the MBR membrane treatment zone 14 through the first bypass pipe 604. A first bypass valve 602 is provided on the first bypass pipe 604.

[0029] An inclined tube 803 is provided in the inclined tube sedimentation zone 8. The area above the inclined tube 803 is connected to the disinfection zone 9 through a second bypass tube 805. A second bypass valve 801 is provided on the second bypass tube 805.

[0030] A second baffle 308 is movably installed at the connection between two adjacent pre-anoxic units 301, and a third baffle 309 is movably installed at the connection between the last two pre-anoxic units 301; a third overpass pipe 11 is provided between the last pre-anoxic unit 301 and the pre-anoxic unit 301 in front of the second baffle 308, and a third overpass valve 1103 is provided on it.

[0031] The third overpass pipe 11 is connected to the first vent pipe 1102, and the first vent pipe 1102 is equipped with a first vent valve 1105. The first vent valve 1105 and the third overpass valve 1103 are connected in parallel.

[0032] An internal reflux pipe 12 is provided between the front end of the pre-hypoxia zone 3 (i.e., the first pre-hypoxia unit 301) and the front end of the post-hypoxia zone 6 (i.e., the first post-hypoxia unit 601), and an internal reflux pump 1202 is provided on the internal reflux pipe 12.

[0033] The inner reflux pipe 12 is provided with a second vent pipe 1201, and the second vent pipe 1201 is provided with a second vent valve 1204. The second vent valve 1204 and the inner reflux pump 1202 are connected in parallel.

[0034] A sludge return pipe 13 is provided between the pre-anoxic zone 1 and the area below the inclined tube 803 of the inclined tube sedimentation zone 8, and a sludge return pump 1302 is provided on the sludge return pipe 13.

[0035] A third vent pipe 1301 is connected to the sludge return pipe 13, and a third vent valve 1304 is provided on the third vent pipe 1301. The third vent valve 1304 and the sludge return pump 1302 are connected in parallel.

[0036] It also includes a main water inlet pipe 105, on which a water inlet pump 101 is installed. A main water pipe 102 and two branch water pipes 103 are connected in parallel at the rear end of the water inlet pump 101. The main water pipe 102 is connected to the pre-anoxic zone 1, and the two branch water pipes 103 are connected to the front end of the anaerobic zone 2 (i.e., the first anaerobic unit 201) and the front end of the pre-anoxic zone 3 (i.e., the first pre-anoxic unit 301), respectively. A water distribution valve 104 is installed on the branch water pipe 103.

[0037] The first baffle 603, the second baffle 308, and the third baffle 309 are all slidably connected to the pool wall.

[0038] Disinfection zone 9 is connected to water outlet pipe 901.

[0039] The last pre-anoxic unit 301 is connected to the first pre-aerobic unit 401 via an outlet weir 307.

[0040] The MBR membrane treatment zone 14 is equipped with an MBR membrane module 1401, and the MBR membrane treatment zone 14 is connected to the disinfection zone 9 via a suction pump 1402.

[0041] Vertical corrugated plates 501 are installed in the deoxidation zone 5.

[0042] The working mode of this embodiment is as follows:

[0043] Open the second overpass valve 801; close the first overpass valve 602, the suction pump 1402, and the third overpass valve 1103; the second baffle 308, the third baffle 309, and the first baffle 603 are in the open state.

[0044] During normal operation, the first vent valve 1105, the second vent valve 1204, and the third vent valve 1304 are all closed. When the system is being maintained or repaired, these valves are opened to release air through the first vent pipe 1102, the second vent pipe 1201, and the third vent pipe 1301.

[0045] The pretreated wastewater is distributed into the pre-anoxic zone 1, anaerobic zone 2, and pre-anoxic zone 3 by gravity flow or by the inlet pump 101 through the main water pipe 102 and the branch water pipe 103 respectively, with the inlet flow distribution ratio being: pre-anoxic zone 1: anaerobic zone 2: anoxic zone 3 = 2:4:4.

[0046] The influent to pre-anoxic zone 1 is treated sequentially through pre-anoxic zone 1, anaerobic zone 2, and pre-anoxic zone 3 before entering aerobic zone 4; the influent to anaerobic zone 2 is treated sequentially through anaerobic zone 2 and pre-anoxic zone 3 before entering aerobic zone 4; and the influent to pre-anoxic zone 3 is treated in pre-anoxic zone 3 before entering aerobic zone 4. The total hydraulic retention time of each anaerobic unit 201 in anaerobic zone 2 is 60 min to 120 min; the total hydraulic retention time of each pre-anoxic unit 301 in pre-anoxic zone 3 is 2.0 h to 10.0 h.

[0047] The effluent from the pre-anoxic zone 3 enters the pre-aerobic zone 4 via the effluent weir 307 through a drop. The bottom of the pre-aerobic zone 4 is equipped with an aeration disc.

[0048] Wastewater treated in the pre-aerobic zone 4 enters the deoxygenation zone 5, then passes through vertically installed corrugated plates 501, and finally enters the post-anoxic zone 6. A carbon source addition point is reserved at the top of the post-anoxic zone 6. The hydraulic retention time in the deoxygenation zone 5 is 30 min to 60 min, and the hydraulic retention time in the post-anoxic zone 6 is 2.0 h to 4.0 h.

[0049] The effluent from the post-anoxic zone 6 enters the post-aerobic zone 7, then enters the inclined tube sedimentation zone 8, and after sedimentation in the inclined tube 803, it enters the disinfection zone 9 through the second bypass tube 805. After disinfection, it is discharged from the effluent outlet pipe 901.

[0050] The internal reflux pump 1202 transports nitrified liquid from the first post-anoxic unit 601 of the post-anoxic zone 6 to the first pre-anoxic unit 301 of the pre-anoxic zone 3. The internal reflux flow rate is 2.5Q~4.0Q (Q is the total influent flow rate).

[0051] The sludge return pump 1302 transports the returned sludge from the bottom of the inclined tube sedimentation zone 8 to the pre-anoxic zone 1, with a sludge return flow rate of 0.5Q~1.0Q.

[0052] The wastewater treatment data in this embodiment are as follows: the average COD concentration of the system influent was 375 mg / L, corresponding to a removal rate of 86.7%; the average BOD concentration was 242 mg / L, corresponding to a removal rate of 96.5%; the average SS concentration was 205 mg / L, corresponding to a removal rate of 95.6%; the average TN concentration was 68.5 mg / L, corresponding to a removal rate of 83.4%; the average ammonia nitrogen concentration was 47.5 mg / L, corresponding to a removal rate of 89.6%; and the average TP concentration was 3.4 mg / L, corresponding to a removal rate of 85.3%. All effluent indicators meet the Class A standard of the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB 18918-2002).

[0053] Depending on the influent water quality, when it is necessary to reduce the number of pre-anoxic units 301 in anoxic zone 3, the second baffle 308 and the third baffle 309 are closed, and the third bypass valve 1103 is opened. Then, the water flow of the third pre-anoxic unit 301 directly enters the last pre-anoxic unit 301 through the third bypass pipe 11.

[0054] Example 2

[0055] The difference between this embodiment and Embodiment 1 is that the first baffle 603 and the second bypass valve 801 are closed; the first bypass valve 602 and the suction pump 1402 are opened. The influent then passes through the pre-anoxic zone 1, anaerobic zone 2, pre-anoxic zone 3, pre-aerobic zone 4, deoxygenation zone 5, and post-anoxic zone 6, before entering the MBR membrane treatment zone 14 via the first bypass pipe 604. After being treated by the MBR membrane module 1401, it enters the disinfection zone 9 and is then discharged through the outlet pipe 901.

[0056] The indicators in this embodiment have consistently met the Class IV water standard in the "Surface Water Environmental Quality Standard" (GB 3838-2002).

[0057] In this embodiment, the number of pre-anoxic units 301 in the anoxic zone 3 can also be reduced according to the influent water quality.

[0058] This invention allows for flexible switching of end-of-pipe treatment modes, and the effluent from different modes all meets wastewater discharge standards.

[0059] This invention features a transcendent mode. When the concentration of organic matter in the influent is low, the influent water quality fluctuates greatly, and the influent volume is small, such as in rural areas of Northwest China where the water volume is small in winter, the system can switch to a short-process mode by adjusting the number of pre-anoxic units 301 in the anoxic zone 3. This helps to fully utilize the carbon source and improve the denitrification efficiency. The system can be adjusted and improved according to the actual situation and is suitable for wastewater treatment needs of different scales and water qualities.

Claims

1. A mode-switchable integrated small-scale sewage treatment system, characterized in that: It includes a pre-anoxic zone (1), an anaerobic zone (2), a pre-anoxic zone (3), a pre-aerobic zone (4), a deoxygenation zone (5), a post-anoxic zone (6), a post-aerobic zone (7), and an inclined tube sedimentation zone (8) connected in sequence. A first baffle (603) is movably installed at the connection between the post-anoxic zone (6) and the post-aerobic zone (7). The end of the post-anoxic zone (6) is connected to the MBR membrane treatment zone (14) through the first bypass pipe (604). The first bypass pipe (604) is equipped with a first bypass valve (602). An inclined tube (803) is provided in the inclined tube sedimentation zone (8). The area above the inclined tube (803) is connected to the disinfection zone (9) through the second bypass tube (805). A second bypass valve (801) is provided on the second bypass tube (805).

2. The mode-switchable integrated small-scale sewage treatment system according to claim 1, characterized in that: The pre-hypoxia zone (3) is composed of multiple pre-hypoxia units (301) connected in series. A second baffle (308) is movably provided at the connection between two adjacent pre-hypoxia units (301), and a third baffle (309) is movably provided at the connection between the last two pre-hypoxia units (301). A third overpass tube (11) with a third overpass valve (1103) is provided between the last pre-hypoxia unit (301) and the pre-hypoxia unit (301) in front of the second baffle (308).

3. The mode-switchable integrated small-scale sewage treatment system according to claim 2, characterized in that: The third overpass pipe (11) is connected to a first vent pipe (1102), and the first vent pipe (1102) is provided with a first vent valve (1105). The first vent valve (1105) and the third overpass valve (1103) are connected in parallel.

4. The mode-switchable integrated small-scale sewage treatment system according to claim 3, characterized in that: An internal reflux pipe (12) is provided between the front end of the pre-hypoxia zone (3) and the front end of the post-hypoxia zone (6), and an internal reflux pump (1202) is provided on the internal reflux pipe (12).

5. The mode-switchable integrated small-scale sewage treatment system according to claim 4, characterized in that: The inner reflux pipe (12) is provided with a second vent pipe (1201), and the second vent pipe (1201) is provided with a second vent valve (1204). The second vent valve (1204) and the inner reflux pump (1202) are connected in parallel.

6. The mode-switchable integrated small-scale sewage treatment system according to claim 5, characterized in that: A sludge return pipe (13) is provided between the pre-anoxic zone (1) and the area below the inclined tube (803) of the inclined tube sedimentation zone (8), and a sludge return pump (1302) is provided on the sludge return pipe (13).

7. The mode-switchable integrated small-scale sewage treatment system according to claim 6, characterized in that: The sludge return pipe (13) is connected to a third vent pipe (1301), and a third vent valve (1304) is provided on the third vent pipe (1301). The third vent valve (1304) and the sludge return pump (1302) are connected in parallel.

8. The mode-switchable integrated small-scale sewage treatment system according to claim 7, characterized in that: It also includes a main water inlet pipe (105), on which a water inlet pump (101) is installed. A main water pipe (102) and two branch water pipes (103) are connected in parallel at the rear end of the water inlet pump (101). The main water pipe (102) is connected to the pre-anoxic zone (1), and the two branch water pipes (103) are connected to the front end of the anaerobic zone (2) and the front end of the pre-anoxic zone (3), respectively. A water distribution valve (104) is installed on the branch water pipe (103).

9. The mode-switchable integrated small-scale sewage treatment system according to claim 2, characterized in that: The first baffle (603), the second baffle (308) and the third baffle (309) are all slidably connected to the pool wall.

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