Sewage treatment unit and sewage treatment integrated equipment

Abstract

The utility model discloses a sewage treatment unit and sewage treatment integrated equipment, the sewage treatment unit comprises an anaerobic tank, an aerobic tank, a first air outlet pipe, a first branch pipe, a second branch pipe and a vertically arranged third branch pipe, the lower end part of the third branch pipe is communicated with the first branch pipe, the upper end part of the third branch pipe is communicated with the second branch pipe, and the first branch pipe is communicated with the aerobic tank. An outlet of the second branch pipe is positioned in the anaerobic tank; the two end parts of the first branch pipe respectively extend into the anaerobic tank and the aerobic tank, and a plurality of first through holes are formed in the side walls of the two end parts of the first branch pipe; one end of the first air outlet pipe is communicated with an air outlet of the first blower device, and the other end of the first air outlet pipe is arranged in the third branch pipe; and a biological carrier for carrying nitrifying bacteria is arranged in the aerobic tank. The sewage treatment unit provided by the utility model solves the technical problem of electric energy waste caused by the arrangement of a stirring device in an anaerobic tank in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a wastewater treatment unit and an integrated wastewater treatment device. Background Technology

[0002] Currently, integrated wastewater treatment equipment is commonly used in villages, towns, hospitals, schools, etc., to collect and treat scattered wastewater, ensuring it meets discharge standards or is reused. Existing technologies generally employ a series process involving anaerobic and aerobic tanks. Each tank contains activated sludge; wastewater is treated in the anaerobic tank before entering the aerobic tank, and then further treated before proceeding to subsequent treatment units.

[0003] In the process of sewage treatment, the following five problems are usually encountered: (1) A stirring device is usually required in the anaerobic tank to ensure that the activated sludge and sewage are fully mixed and the sludge is used to treat the pollutants in the sewage. However, the stirring device will generate a lot of electricity waste and also increase maintenance costs; (2) An aeration device is usually required at the bottom of the aerobic tank. A blower is used to pump air into the water to oxygenate the activated sludge in the water and also to stir it. However, the blower needs to overcome the pressure of several meters of water depth to pump air into the water. Therefore, a high-pressure blower is required, and the selection of a high-pressure blower will increase the amount of electricity used; (3) Conventional integrated sewage treatment equipment requires a large sedimentation tank. After the sludge mixture passes through anaerobic and aerobic treatment units, it needs to be separated into sludge and water in the sedimentation tank. The supernatant is discharged, and the bottom sludge is pumped back to the front end. This will cause energy waste and increase the floor space. (4) The activated sludge in the anaerobic tank will enter the aerobic tank, causing the anaerobic bacteria in the activated sludge to mix with the aerobic bacteria, resulting in low treatment efficiency and inability to efficiently cultivate specific bacteria. (5) When the organic carbon source in the influent is low and the ammonia nitrogen is high, the conventional process requires the addition of an external organic carbon source to maintain the sludge concentration, thereby ensuring the ammonia nitrogen removal rate, but this results in the waste of carbon source. Utility Model Content

[0004] In view of the existing technical problems, this utility model aims to provide a sewage treatment unit and an integrated sewage treatment equipment. This sewage treatment unit can solve the technical problem of wasted electrical energy caused by the installation of a stirring device in the anaerobic tank in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A wastewater treatment unit includes an anaerobic tank and an aerobic tank. Its structural features include: a first air outlet pipe, a first branch pipe, a second branch pipe, and a vertically arranged third branch pipe. The lower end of the third branch pipe is connected to the first branch pipe, and the upper end of the third branch pipe is connected to the second branch pipe. The outlet of the second branch pipe is located within the anaerobic tank. Both ends of the first branch pipe extend into the anaerobic tank and the aerobic tank, respectively, and multiple first through holes are provided on the side walls of both ends of the first branch pipe. One end of the first air outlet pipe is connected to the air outlet of a first blower, and the other end is located within the third branch pipe. The aerobic tank contains a biological carrier for carrying nitrifying bacteria.

[0007] The aerobic tank in this wastewater treatment unit uses a biological carrier. Nitrifying bacteria on the biological carrier remove ammonia nitrogen from the wastewater, instead of using conventional activated sludge. This method is suitable for treating wastewater with low organic carbon sources and a certain amount of ammonia nitrogen, eliminating the need for external carbon sources. After treatment in the anaerobic tank, the wastewater carrying activated sludge enters the aerobic tank for further treatment. Opening the first blower reduces the pressure in the third branch pipe, causing the wastewater carrying activated sludge in both the anaerobic and aerobic tanks to be lifted upwards through the first through-hole into the third branch pipe, and then flow into the anaerobic tank through the second branch pipe. Wastewater from the lower parts of the anaerobic and aerobic tanks, under the action of the first blower, is sprayed into the anaerobic tank along the first, third, and second branch pipes. The wastewater in the anaerobic tank circulates between the bottom and top, providing a stirring effect. Therefore, there is no need to install a stirring device within the anaerobic tank, and the power consumption of the first blower is significantly lower than that of conventional stirring devices. Activated sludge flowing from the anaerobic tank into the aerobic tank is lifted upwards by the blower and returned to the anaerobic tank. This ensures that the anaerobic bacteria in the anaerobic tank and the biological carriers in the aerobic tank are distributed in their respective areas, preventing mixing. The bacteria live in more suitable areas, improving treatment efficiency. Furthermore, as the wastewater carrying activated sludge in the aerobic tank is lifted upwards through the first through-hole, it provides some agitation, reducing the power consumption of the aeration device connected to the aerobic tank.

[0008] Preferably, a first partition is provided between the anaerobic tank and the aerobic tank, and a first flow hole is provided at the lower part of the first partition. The anaerobic tank and the aerobic tank are connected through the first flow hole, and a first branch pipe is located below the first flow hole. Wastewater in the anaerobic tank flows into the aerobic tank through the first flow hole. Placing the first flow hole above the first branch pipe can reduce the flow of activated sludge from the anaerobic tank into the aerobic tank.

[0009] Preferably, the first baffle is equipped with a baffle plate located inside the anaerobic tank and positioned above the first flow hole. The baffle plate's blocking effect reduces the probability of activated sludge from the anaerobic tank flowing into the aerobic tank.

[0010] Preferably, the end of the first branch pipe located in the aerobic tank is arranged along the length of the first baffle, and the biological carrier is arranged above the first branch pipe. Activated sludge in the anaerobic tank flows into the aerobic tank through the flow hole. By setting the first branch pipe along the length of the first baffle, the activated sludge flowing into the aerobic tank can be intercepted, and most of the activated sludge can be lifted upward through the first through hole and returned to the anaerobic tank.

[0011] Preferably, the bottom of the aerobic tank is provided with multiple aeration heads, which are connected to the second blower, and the outlet of the first air outlet pipe is located above the aeration heads.

[0012] Preferably, the height of the air outlet of the first air outlet pipe is 0.8 to 1.5 m higher than the height of the aeration head.

[0013] Preferably, the second branch pipe has multiple branch pipes at its end, each branch pipe having a second through hole on its side wall, and the multiple branch pipes are spaced apart along the length of the anaerobic tank; the air outlet of the first air outlet pipe faces upward. By setting multiple branch pipes, the lifted wastewater can be evenly distributed into the anaerobic tank and fully mix with the wastewater in the anaerobic tank.

[0014] Based on the same inventive concept, this application also provides an integrated sewage treatment device, which includes N sewage treatment units arranged in series as described above, where N>1 and is an integer; the aerobic tank and anaerobic tank in two adjacent sewage treatment units are arranged adjacent to each other and connected through a second flow hole, and the biological carrier is arranged at the second flow hole; the side wall of the anaerobic tank in the first sewage treatment unit is provided with an inlet pipe, and the side wall of the aerobic tank in the Nth sewage treatment unit is provided with an outlet pipe.

[0015] When the wastewater quality is poor or the volume is large, in order to ensure the wastewater treatment effect, multiple wastewater treatment units can be connected in series. The wastewater enters through the inlet pipe of the first wastewater treatment unit, is treated in the anaerobic tank and the aerobic tank, and then enters the second wastewater treatment unit through the second flow hole. It then flows through the next treatment unit in sequence, and finally flows out through the outlet pipe of the aerobic tank in the Nth wastewater treatment unit.

[0016] Preferably, the anaerobic tank in the first wastewater treatment unit is connected to the third branch pipe in the Nth wastewater treatment unit via a return pipe equipped with a first valve. When a small amount of activated sludge flows from the first wastewater treatment unit to the last wastewater treatment unit, it can flow back into the first wastewater treatment unit through the return pipe, thus ensuring that the sludge at the front end is not lost and eliminating the need for a sedimentation tank at the rear end, saving land and energy for sludge recycling.

[0017] Preferably, each aerobic tank in the wastewater treatment unit is equipped with multiple aeration heads at the bottom, and these aeration heads are all connected to a second aeration device. Each wastewater treatment unit's first outlet pipe is connected to a first aeration device, and a second valve is installed on each connecting pipe. The first aeration device, the second aeration device, and the multiple second valves are all electrically connected to the control system. Based on the water quality, the control system controls and adjusts the opening degrees of the first aeration device, the second aeration device, and the second valves, thereby regulating the amount of wastewater lifted into the third branch pipe.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The wastewater treatment unit of this utility model circulates the wastewater in the anaerobic tank at the bottom and top of the anaerobic tank, so that the activated sludge and wastewater are fully mixed. Therefore, there is no need to install a stirring device in the anaerobic tank. Moreover, the power consumption of the first blower is much less than that of a conventional stirring device, which greatly saves energy.

[0020] 2. The wastewater treatment unit of this utility model lifts the activated sludge that has flowed from the anaerobic tank into the aerobic tank upwards and returns it to the anaerobic tank. This allows the anaerobic bacteria in the anaerobic tank and the biological carriers in the aerobic tank to be distributed in their respective areas without mixing. The bacteria live in more suitable areas, thus improving the treatment efficiency.

[0021] 3. In the wastewater treatment unit of this utility model, when the wastewater carrying activated sludge in the aerobic tank is lifted upward through the first through hole, it can play a certain role in stirring the aerobic tank, thereby reducing the power consumption of the aeration device connected to the aerobic tank.

[0022] 4. The integrated sewage treatment equipment of this utility model does not require a sedimentation tank at the back end, saving land and energy for sludge recycling.

[0023] 5. The integrated wastewater treatment equipment of this utility model is suitable for treating wastewater with low organic carbon sources and containing a certain amount of ammonia nitrogen. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the integrated sewage treatment equipment in Embodiment 1 of this utility model;

[0025] Figure 2 yes Figure 1 A top-view structural diagram;

[0026] Figure 3 This is a schematic diagram of the integrated sewage treatment equipment in Embodiment 2 of this utility model.

[0027] In the figure

[0028] 1—Inlet pipe; 2—Box body; 3—Baffle plate; 4—First flow passage; 5—First baffle; 6—Anaerobic tank; 7—Aerobic tank; 8—Control system; 9—Second blower; 10—First blower; 11—Aeration head; 12—Biological carrier; 13—Outlet pipe; 14—Return pipe; 15—First branch pipe; 16—Second branch pipe; 17—Third branch pipe; 18—First through hole; 19—First air outlet pipe; 20—Branch pipe; 21—Second through hole; 22—Second flow passage; 23—First valve; 24—Second valve; 25—Second baffle. Detailed Implementation

[0029] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0030] Example 1

[0031] like Figure 1 As shown, an integrated wastewater treatment device in this embodiment includes a housing 2, a first blower 10, a second blower 9, and a control system 8. Both the first blower 10 and the second blower 9 are blowers. Two second partitions 25 are provided along the width direction inside the housing 2, dividing the housing 2 into three wastewater treatment units. Each wastewater treatment unit includes a first outlet pipe 19, a first branch pipe 15, a second branch pipe 16, a vertically arranged third branch pipe 17, and an anaerobic tank 6 and an aerobic tank 7 arranged adjacent to each other from left to right. The third branch pipe 17 is located within the aerobic tank 7. A biological carrier 12 is provided in the aerobic tank 7, and nitrifying bacteria are present on the biological carrier 12. A first partition 5 is provided between the anaerobic tank 6 and the aerobic tank 7, and a first flow passage 4 is provided at the lower part of the first partition 5, connecting the anaerobic tank 6 and the aerobic tank 7 through the first flow passage 4. A baffle plate 3 is provided on the first partition plate 5. The baffle plate 3 is located inside the anaerobic tank 6 and is positioned above the first flow passage 4. Figure 1 and Figure 2As shown, the lower end of the third branch pipe 17 is connected to the first branch pipe 15, and the upper end of the third branch pipe 17 is connected to the second branch pipe 16. The outlet of the second branch pipe 16 is located inside the anaerobic tank 6. Four branch pipes 20 are provided at the end of the second branch pipe 16, and each of the four branch pipes 20 has a second through hole 21 on its side wall. The four branch pipes 20 are spaced apart along the length of the anaerobic tank 6. The first branch pipe 15 is located below the first flow hole 4, and both ends of the first branch pipe 15 extend into the anaerobic tank 6 and the aerobic tank 7, respectively. Multiple first through holes 18 are provided on the side walls of both ends of the first branch pipe 15. The end of the first branch pipe 15 located inside the aerobic tank 7 is arranged along the length of the first partition 5, and the biological carrier 12 is located above the first branch pipe 15. One end of the first air outlet pipe 19 is connected to the air outlet of the first blower 10, and the other end is located inside the third branch pipe 17, with the air outlet of the first air outlet pipe 19 facing upwards. The aerobic tank 7 has multiple aeration heads 11 at its bottom, which are connected to the second blower 9. The outlet of the first air outlet pipe 19 is located above the aeration heads 11, and its height is 0.8 to 1.5 meters higher than that of the aeration heads 11. The aerobic tank 7 and anaerobic tank 6 in two adjacent wastewater treatment units are arranged adjacent to each other and connected by a second flow passage 22 on the second partition 25. The biological carrier 12 is located at this second flow passage 22. An inlet pipe 1 is provided on the side wall of the anaerobic tank 6 in the first wastewater treatment unit, and an outlet pipe 13 is provided on the side wall of the aerobic tank 7 in the third wastewater treatment unit. The anaerobic tank 6 in the first wastewater treatment unit and the third branch pipe 17 in the third wastewater treatment unit are connected by a return pipe 14, which is equipped with a first valve 23. Each aerobic tank 7 in each wastewater treatment unit is equipped with multiple aeration heads 11 at the bottom, and each aeration head 11 is connected to a second blower 9. The first air outlet pipe 19 in each wastewater treatment unit is connected to a first blower 10, and a second valve 24 is provided on the connecting pipe. The first blower 10, the second blower 9, and the three second valves 24 are all electrically connected to the control system 8, and the second valves 24 are electrically controlled valves.

[0032] When the integrated wastewater treatment equipment is in use, wastewater enters the anaerobic tank 6 in the first wastewater treatment unit through the inlet pipe 1. After treatment with activated sludge, the wastewater carrying the activated sludge enters the aerobic tank 7 in the first wastewater treatment unit through the first overflow hole 4. Nitrifying bacteria in the aerobic tank 7 remove ammonia nitrogen from the wastewater. Simultaneously, under the air lift action of the first blower 10, the wastewater carrying activated sludge in the anaerobic tank 6 and aerobic tank 7 enters the first branch pipe 15 through the first through hole 18, and is then lifted upwards through the third branch pipe 17 to the second branch pipe 16. Finally, it is evenly dispersed into the anaerobic tank 6 through the second through hole 21 on the branch pipe 20, where it slowly settles and mixes thoroughly with the wastewater. The wastewater carrying activated sludge in the anaerobic tank 6 circulates at the bottom and top of the anaerobic tank 6, which agitates the wastewater, thus eliminating the need for a stirring device in the anaerobic tank 6. By installing the baffle 3, the amount of activated sludge entering the aerobic tank 7 from the anaerobic tank 6 can be reduced. The amount of sewage rising upwards in the third branch pipe 17 can be regulated by the control system 8, which controls the opening of the second valve 24 according to the sewage quality. After treatment in the aerobic tank 7 of the first sewage treatment unit, the sewage enters the second sewage treatment unit through the second flow hole 22 on the second baffle 25 for further treatment, and finally flows out through the effluent pipe 13 after treatment in the third sewage treatment unit. When a small amount of activated sludge flows from the first sewage treatment unit into the third sewage treatment unit, the first valve 23 is opened, and the activated sludge is returned to the first sewage treatment unit through the return pipe 14, thus ensuring that the sludge at the front end is not lost. Since the activated sludge is mainly controlled in the anaerobic tank 6, there is no need to set up a separate sedimentation tank at the rear end.

[0033] Example 2

[0034] like Figure 3 As shown, the difference between the sewage treatment unit and the integrated sewage treatment equipment in this embodiment and that in embodiment 1 is that the third branch pipe 17 is set inside the anaerobic tank 6, and the other structures are the same.

[0035] The above embodiments should be understood as being used only to illustrate the utility model more clearly, and not to limit the scope of the utility model. After reading this utility model, any modifications of the embodiments by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

Claims

1. A wastewater treatment unit, comprising an anaerobic tank (6) and an aerobic tank (7); characterized in that: It also includes a first air outlet pipe (19), a first branch pipe (15), a second branch pipe (16), and a vertically arranged third branch pipe (17). The lower end of the third branch pipe (17) is connected to the first branch pipe (15), and the upper end of the third branch pipe (17) is connected to the second branch pipe (16). The outlet of the second branch pipe (16) is located in the anaerobic tank (6). The two ends of the first branch pipe (15) extend into the anaerobic tank (6) and the aerobic tank (7), respectively, and the side walls of the two ends of the first branch pipe (15) are provided with multiple first through holes (18). One end of the first air outlet pipe (19) is connected to the air outlet of the first blower (10), and the other end is located in the third branch pipe (17). The aerobic tank (7) is provided with a biological carrier (12) for carrying nitrifying bacteria.

2. The wastewater treatment unit according to claim 1, characterized in that: A first partition (5) is provided between the anaerobic tank (6) and the aerobic tank (7). A first flow hole (4) is provided at the lower part of the first partition (5). The anaerobic tank (6) and the aerobic tank (7) are connected through the first flow hole (4). A first branch pipe (15) is located below the first flow hole (4).

3. The wastewater treatment unit according to claim 2, characterized in that: The first partition (5) is provided with a baffle plate (3), which is located inside the anaerobic tank (6) and is positioned above the first flow hole (4).

4. The wastewater treatment unit according to claim 2, characterized in that: The end of the first branch pipe (15) located in the aerobic tank (7) is arranged along the length of the first partition (5), and the biological carrier (12) is arranged above the first branch pipe (15).

5. The wastewater treatment unit according to claim 1, characterized in that: The aerobic tank (7) is provided with multiple aeration heads (11) at the bottom. The aeration heads (11) are connected to the second blower (9), and the air outlet of the first air outlet pipe (19) is located above the aeration heads (11).

6. The wastewater treatment unit according to claim 5, characterized in that: The height of the air outlet of the first air outlet pipe (19) is 0.8 to 1.5 m higher than the height of the aeration head (11).

7. The wastewater treatment unit according to any one of claims 1 to 6, characterized in that: The second branch pipe (16) has multiple branch pipes (20) at its end. Each branch pipe (20) has a second through hole (21) on its side wall. The multiple branch pipes (20) are spaced apart along the length of the anaerobic tank (6). The outlet of the first air outlet pipe (19) is set upward.

8. An integrated wastewater treatment equipment, characterized in that: The system comprises N wastewater treatment units arranged in series as described in any one of claims 1 to 7, where N > 1 and is an integer; the aerobic tank (7) and anaerobic tank (6) in two adjacent wastewater treatment units are arranged adjacent to each other and connected through a second flow passage (22), and the biological carrier (12) is arranged at the second flow passage (22); the anaerobic tank (6) in the first wastewater treatment unit is provided with an inlet pipe (1) on its side wall, and the aerobic tank (7) in the Nth wastewater treatment unit is provided with an outlet pipe (13) on its side wall.

9. The integrated wastewater treatment equipment according to claim 8, characterized in that: The anaerobic tank (6) in the first wastewater treatment unit is connected to the third branch pipe (17) in the Nth wastewater treatment unit through a return pipe (14), which is equipped with a first valve (23).

10. The integrated wastewater treatment equipment according to claim 8, characterized in that: Each aerobic tank (7) in each wastewater treatment unit is equipped with multiple aeration heads (11) at the bottom, and the multiple aeration heads (11) are connected to the second blower (9); the first air outlet pipe (19) in each wastewater treatment unit is connected to the first blower (10), and the connecting pipe is equipped with a second valve (24). The first blower (10), the second blower (9) and the multiple second valves (24) are all electrically connected to the control system (8).

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