Sewage treatment system

Abstract

The utility model relates to the technical field of water purification, in particular to a sewage treatment system which comprises a biochemical pool, a dephosphorization pool and an mbr membrane pool which are sequentially connected, a water inlet of the dephosphorization pool is connected with a water outlet end of the biochemical pool, a water outlet of the dephosphorization pool is connected with a water inlet end of the mbr membrane pool, and a water outlet of the mbr membrane pool is connected with a water outlet end of the biochemical pool. A medicament feeding port is formed in the top of the dephosphorization tank, a stirring part is arranged in the dephosphorization tank, and the distance between the water outlet and the bottom surface of the dephosphorization tank is larger than that between blades of the stirring part and the bottom surface of the dephosphorization tank. According to the sewage treatment system disclosed by the utility model, the phosphorus removal tank is additionally arranged behind the biochemical tank, so that a phosphorus removal agent can be fully coagulated with sewage, the effective utilization rate of the phosphorus removal agent is improved, and a distance exists between the water outlet of the phosphorus removal tank and the bottom surface, so that sediments can be prevented from entering the mbr membrane tank along with water flow and blocking an mbr membrane in the mbr membrane tank.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water purification, more particularly to a sewage treatment system. BACKGROUND

[0002] The first level A standard of urban sewage discharge requires that the total phosphorus is not higher than 0.5 mg / L, and because of the oxygen backflow and the large amount of dissolved oxygen carried in the raw sewage, the anaerobic environment formed in the anaerobic zone cannot meet the working conditions of the phosphorus accumulating bacteria when the sewage is in the biochemical pool. The phosphorus accumulating bacteria cannot decompose the polyphosphate in the body into inorganic phosphorus in the anaerobic zone, and release it into the liquid phase, which makes it difficult to achieve the required biological phosphorus removal efficiency, so it is necessary to use a phosphorus removal agent to assist in phosphorus removal. After the phosphorus removal agent is added into the wastewater, it is adsorbed by the phosphorus in the wastewater through precipitation and flocculation reaction.

[0003] When the phosphorus removal agent is used to remove phosphorus before the sewage enters the biochemical pool, it is difficult to ensure that the sewage treated by the phosphorus accumulating bacteria in the biochemical pool meets the standard. When the phosphorus removal agent is added into the MBR membrane pool after the biochemical pool, the complex particles formed by the phosphorus removal agent will block the mbr membrane, affecting the filtration efficiency of the mbr membrane. Therefore, the phosphorus removal agent is generally added to the outlet end of the biochemical pool. However, the water flow at the outlet end of the biochemical pool is relatively flat, which is not conducive to the full coagulation of the phosphorus removal agent and the sewage, so that most of the phosphorus removal agent is returned to the front end of the biochemical pool through the reflux pump, reducing the effective utilization rate of the phosphorus removal agent, and making the consumption of the phosphorus removal agent high, which will increase the cost of phosphorus removal. SUMMARY

[0004] The utility model discloses a sewage treatment system, including the biochemical pool, the phosphorus removal pool and mbr membrane pool that connect gradually, the water inlet of phosphorus removal pool is connected with the outlet end of biochemical pool, the water outlet of phosphorus removal pool is connected with the water inlet end of mbr membrane pool, the top of phosphorus removal pool is equipped with the reagent adding port, be equipped with the stirring part in phosphorus removal pool, the distance between water outlet and the bottom surface of phosphorus removal pool is greater than the distance between the blade of stirring part and the bottom surface of phosphorus removal pool.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of:

[0006] Provide a kind of sewage treatment system, including the biochemical pool, the phosphorus removal pool and mbr membrane pool that connect gradually, the water inlet of phosphorus removal pool is connected with the outlet end of biochemical pool, the water outlet of phosphorus removal pool is connected with the water inlet end of mbr membrane pool, the top of phosphorus removal pool is equipped with the reagent adding port, be equipped with the stirring part in phosphorus removal pool, the distance between water outlet and the bottom surface of phosphorus removal pool is greater than the distance between the blade of stirring part and the bottom surface of phosphorus removal pool.

[0007] The utility model discloses a sewage treatment system, is provided with the phosphorus removal tank in the end of biochemical pool, and the phosphorus removal agent is added to the phosphorus removal tank through the dosing opening, and the sewage discharged by the biochemical pool mixes with the phosphorus removal agent in the phosphorus removal tank, and the sewage in the phosphorus removal tank is stirred after the stirring part, can be fully coagulated with the phosphorus removal agent added in the phosphorus removal tank, so that the phosphorus removal agent adsorbs the phosphorus in the sewage in the phosphorus removal tank and forms the deposit, further reduces the phosphorus content in the sewage.

[0008] The sewage treatment system in the utility model adds the setting of the phosphorus removal tank after the biochemical pool, so that the phosphorus removal agent can be fully coagulated with the sewage, the effective utilization rate of the phosphorus removal agent is improved, and the outlet and the bottom surface of the phosphorus removal tank exist a distance, which can avoid the deposit from entering the mbr membrane tank with the water flow, block the mbr membrane in the mbr membrane tank, and also can avoid the water body in the mbr membrane tank from being backflowed by the vortex after the vortex is formed in the process of stirring of the stirring part.

[0009] Further, the stirring part includes a paddle, a driving rod and a rotary motor, the rotary motor is installed on the outside of the phosphorus removal tank, the driving rod is connected with the driving end of the rotary motor, the paddle is installed on the bottom of the driving rod, the paddle has a plurality of, and the plurality of paddles are arranged in a circle equidistantly around the axis of the driving rod as the rotation center.

[0010] Further, the width of one end of the paddle close to the driving rod is greater than the width of the other end of the paddle away from the driving rod. The width of one end of the paddle close to the driving rod is wider, so that the disturbance of one end of the paddle close to the driving rod to the water body is stronger when the stirring part works, and the other end of the paddle away from the driving rod is difficult to form a vortex when driving the water body to move. On the basis of ensuring that the phosphorus removal agent can be fully mixed with the sewage, the water flow vortex in the phosphorus removal tank is further avoided.

[0011] Further, the acute angle between one end of the paddle close to the driving rod and the axis of the driving rod is 5-25 degrees. The plane of the paddle is not parallel to the axis of the driving rod, which can reduce the water resistance of the paddle when rotating. When the acute angle between the paddle and the axis of the driving rod is 5-25 degrees, it can be ensured that the paddle can disturb the water body smoothly.

[0012] Further, the outlet is provided with a filter screen for preventing the deposit from entering the mbr membrane tank, and the filter screen covers the outlet. The filter screen is arranged at the outlet, which can further avoid the deposit produced by the phosphorus removal agent in the phosphorus removal tank from entering the mbr membrane tank.

[0013] Further, the water outlet is further provided with an aeration pipe, the aeration pipe is located on the filter screen and close to one side of the mbr membrane tank, the aeration pipe is connected with a gas source, the aeration pipe is provided with an aeration head, the aeration head is arranged towards the filter screen, and the aeration head can aerate the filter screen. The aeration head on the aeration pipe can aerate the filter screen, so that the sediment blocking the filter screen can be removed, and the water inflow of the mbr membrane tank is not affected by the filter screen blockage.

[0014] Further, the water outlet is further provided with an aeration pipe, the aeration pipe is located on the filter screen and close to one side of the mbr membrane tank, the aeration pipe is connected with a gas source, the aeration pipe is provided with an aeration head, the aeration head is arranged towards the filter screen, and the aeration head can aerate the filter screen. The aeration head on the aeration pipe can aerate the filter screen, so that the sediment blocking the filter screen can be removed, and the water inflow of the mbr membrane tank is not affected by the filter screen blockage.

[0015] Further, the side wall of the phosphorus removal tank is provided with a discharge port, the discharge port is located at the bottom of the side wall of the phosphorus removal tank, and a gate is installed on the discharge port. The bottom surface of the phosphorus removal tank is an inclined bottom surface, and the distance between the end of the bottom surface of the phosphorus removal tank close to the discharge port and the top of the phosphorus removal tank is greater than the distance between the end of the bottom surface of the phosphorus removal tank away from the discharge port and the top of the phosphorus removal tank. When the gate of the discharge port is opened, the sediment generated by the phosphorus removal agent in the phosphorus removal tank can be cleaned, and the bottom surface of the phosphorus removal tank is inclined towards the discharge port, so that the sediment accumulated in the phosphorus removal tank can be cleaned more conveniently.

[0016] Further, the water outlet has a plurality of water outlets, each water outlet is connected with one mbr membrane tank, and the stirring part also has a plurality of stirring parts, each stirring part corresponds to one water outlet. The plurality of water outlets can further increase the water outlet efficiency, and the plurality of stirring parts can further increase the sufficient contact between the phosphorus removal agent and the sewage.

[0017] Compared with the prior art, the sewage treatment system has the advantages that:

[0018] The sewage treatment system in the utility model increases the phosphorus removal tank after the biochemical tank, so that the phosphorus removal agent can be fully mixed with the sewage, the effective utilization rate of the phosphorus removal agent is improved, and the water outlet of the phosphorus removal tank is away from the bottom surface, so that the sediment can not enter the mbr membrane tank along with the water flow, and the mbr membrane in the mbr membrane tank is not blocked.

[0019] The water outlet of the sewage treatment system in the utility model is provided with a filter screen, so that the sediment generated by the phosphorus removal agent in the phosphorus removal tank can be further prevented from entering the mbr membrane tank.

[0020] The sewage treatment system is characterized in that a phosphorus removal tank is arranged in the sewage treatment system, and a side wall of the phosphorus removal tank is provided with a discharge port. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the sewage treatment system;

[0022] Figure 2 It is a structural schematic view of the phosphorus removal tank of the sewage treatment system;

[0023] Figure 3 It is another angle structural schematic view of the phosphorus removal tank of the sewage treatment system;

[0024] Figure 4 It is a structural schematic view of the phosphorus removal tank in the third embodiment of the sewage treatment system.

[0025] In the drawings: 1, biochemical tank; 2, phosphorus removal tank; 3, mbr membrane tank; 201, water inlet; 202, water outlet; 4, stirring part; 401, paddle; 402, driving rod; 403, rotary motor; 5, filter screen; 6, aeration pipe; 7, cleaning head; 8, connecting rod; 203, discharge port; 9, gate. DETAILED DESCRIPTION

[0026] The utility model will be further explained in connection with specific implementation. Among them, the drawings are only for example explanation, and the representation is only schematic diagram, and cannot be understood as the limitation to the patent; in order to better explain the embodiment of the utility model, the drawings of some components will be omitted, enlarged or reduced, and the size of actual product is not represented; for the technical personnel in the art, it is understandable that some well-known structures in the drawings and their description can be omitted.

[0027] The same or similar reference numerals in the drawings of the utility model embodiment correspond to the same or similar components; in the description of the utility model, it is understood that if there are terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore the positional relationship description in the drawings is only for example explanation, and cannot be understood as the limitation to the patent, for the ordinary skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0028] Embodiment one

[0029] This embodiment is a first embodiment of a sewage treatment system, such as Figure 1 As shown, the system includes a biological treatment tank 1, a phosphorus removal tank 2, and an MBR membrane tank 3 connected in sequence. The inlet 201 of the phosphorus removal tank 2 is connected to the outlet of the biological treatment tank 1, and the outlet 202 of the phosphorus removal tank 2 is connected to the inlet of the MBR membrane tank 3. A chemical dosing port is provided at the top of the phosphorus removal tank 2. A stirring part 4 is provided inside the phosphorus removal tank 2. The distance between the outlet 202 and the bottom surface of the phosphorus removal tank 2 is greater than the distance between the blades of the stirring part 4 and the bottom surface of the phosphorus removal tank 2.

[0030] The working principle of this embodiment is as follows:

[0031] In this embodiment of the wastewater treatment system, a phosphorus removal tank 2 is set at the end of the biological treatment tank 1. A phosphorus removal agent is added to the phosphorus removal tank 2 through a dosing port. The wastewater discharged from the biological treatment tank 1 mixes with the phosphorus removal agent in the phosphorus removal tank 2. After being stirred by the stirring unit 4, the wastewater in the phosphorus removal tank 2 can fully coagulate with the added phosphorus removal agent, allowing the phosphorus removal agent to adsorb phosphorus from the wastewater in the phosphorus removal tank 2 and form precipitate, further reducing the phosphorus content in the wastewater. The distance between the outlet 202 of the phosphorus removal tank 2 and the bottom surface of the phosphorus removal tank 2 is greater than the distance between the blades of the stirring unit 4 and the bottom surface of the phosphorus removal tank 2. This prevents the precipitate from entering the MBR membrane tank 3 with the water flow and clogging the MBR membrane in the MBR membrane tank 3. It also prevents the vortex formed by the stirring unit 4 during stirring from causing the water in the MBR membrane tank 3 to flow back.

[0032] The beneficial effects of this embodiment are as follows:

[0033] The wastewater treatment system in this embodiment adds a phosphorus removal tank 2 after the biological treatment tank 1, which allows the phosphorus removal agent to fully coagulate with the wastewater, improving the effective utilization rate of the phosphorus removal agent. In addition, the outlet 202 of the phosphorus removal tank 2 is at a distance from the bottom surface, which can prevent sediment from entering the MBR membrane tank 3 with the water flow and clogging the MBR membrane in the MBR membrane tank 3.

[0034] Example 2

[0035] This embodiment is a second embodiment of a wastewater treatment system. This embodiment is based on the first embodiment, such as... Figures 2-3 As shown, the structure of the system is further defined.

[0036] Specifically, the stirring part 4 comprises a paddle 401, a driving rod 402 and a rotating motor 403, the rotating motor 403 is installed on the outer side of the phosphorus removal tank 2, the driving rod 402 is connected with the driving end of the rotating motor 403, the paddle 401 is installed on the bottom of the driving rod 402, the paddle 401 is several, and the several paddles 401 are arranged in a circle equidistantly at the bottom of the driving rod 402 with the axis of the driving rod 402 as the rotation center. The width of the paddle 401 near one end of the driving rod 402 is greater than the width of the paddle 401 away from the other end of the driving rod 402. The acute angle between the one end of the paddle 401 connected with the driving rod 402 and the axis of the driving rod 402 is 5°-25°.

[0037] Specifically, the water outlet 202 is provided with a filter screen 5 for preventing the sediment from entering the mbr membrane tank 3, and the filter screen 5 covers the water outlet 202. The water outlet 202 is also provided with an aeration pipe 6, which is located on one side of the filter screen 5 close to the mbr membrane tank 3, and is connected with a gas source. The aeration pipe 6 is provided with an aeration head, and the gas outlet end of the aeration head faces the filter screen 5, so that the filter screen 5 can be aerated.

[0038] Specifically, the side wall of the phosphorus removal tank 2 is provided with a discharge port 203, and the discharge port 203 is located at the bottom of the side wall of the phosphorus removal tank 2. A gate 9 is installed on the discharge port 203. The bottom surface of the phosphorus removal tank 2 is an inclined bottom surface, and the distance between the one end of the bottom surface of the phosphorus removal tank 2 close to the discharge port 203 and the top of the phosphorus removal tank 2 is greater than the distance between the other end of the bottom surface of the phosphorus removal tank 2 away from the discharge port 203 and the top of the phosphorus removal tank 2.

[0039] Specifically, the water outlet 202 is several, and each water outlet 202 is connected with one mbr membrane tank 3. The stirring part 4 is also several, and each stirring part 4 corresponds to one water outlet 202.

[0040] The beneficial effects of the embodiment are as follows:

[0041] The width of the paddle 401 near one end of the driving rod 402 is wider, so that when the stirring part 4 is working, the disturbance of the paddle 401 near one end of the driving rod 402 to the water body is stronger, and the other end of the paddle 401 away from the driving rod 402 is difficult to form a vortex when driving the water body to move. On the basis of ensuring that the phosphorus removal agent can be fully mixed with the sewage, the formation of water flow vortex in the phosphorus removal tank 2 is further avoided. The plane where the paddle 401 is located is not parallel to the axis of the driving rod 402, which can reduce the water resistance of the paddle 401 when rotating. When the acute angle between the paddle 401 and the axis of the driving rod 402 is 5°-25°, it can be ensured that the paddle 401 can smoothly disturb the water body.

[0042] A filter screen 5 is arranged at the water outlet 202, which can further avoid the sediment generated by the phosphorus removal agent in the phosphorus removal tank 2 from entering the mbr membrane tank 3. The filter screen 5 is aerated by the aeration head on the aeration pipe 6, which can remove the sediment clogging the filter screen 5, and avoid the clogging of the filter screen 5 affecting the water inflow of the mbr membrane tank 3.

[0043] The gate 9 at the drain 203 is opened, and the sediment generated by the phosphorus removal agent in the phosphorus removal tank 2 can be cleaned. The bottom surface of the phosphorus removal tank 2 is inclined to the drain 203, which is more convenient for cleaning the sediment accumulated in the phosphorus removal tank 2. A plurality of water outlets 202 are arranged, which can further increase the water outlet efficiency. A plurality of stirring parts 4 are arranged, which can further increase the full contact between the phosphorus removal agent and the sewage.

[0044] Embodiment three

[0045] The embodiment is a third embodiment of a sewage treatment system, as shown in Figure 4 The difference between the embodiment and the second embodiment is that the embodiment does not arrange the aeration pipe 6, but cleans the filter screen 5 by the cleaning part.

[0046] Specifically, the water outlet 202 is provided with a cleaning part, and the cleaning part includes a connecting rod 8 and a cleaning head 7. The water outlet 202 is provided with a sliding rail, and the axis of the sliding rail is parallel to the filter screen 5. The cleaning head 7 is located in the sliding rail and is connected with the sliding rail in a sliding manner. The cleaning head 7 can remove the sediment adhered to the filter screen 5. One end of the connecting rod 8 is fixedly connected with the cleaning head 7, and the other end extends to the outside of the phosphorus removal tank 2.

[0047] The beneficial effects of the embodiment are that the operator pulls the connecting rod 8 to drive the cleaning head 7 to slide up and down in the sliding rail. The cleaning head 7 removes the sediment adhered to the filter screen 5 during the up and down sliding process, which avoids the clogging of the filter screen 5 affecting the water inflow of the mbr membrane tank 3.

[0048] The other features, working principles and beneficial effects of the embodiment are consistent with those of the second embodiment.

[0049] In the specific contents of the above specific embodiments, any combination of technical features can be combined without contradiction. In order to make the description simple, not all possible combinations of the above technical features are described, but as long as the combination of these technical features does not exist contradiction, it should be considered as the scope of the description.

[0050] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A sewage treatment system characterised in that, The utility model provides a biochemical pool (1), phosphorus removal pool (2) and mbr membrane pool (3) including connection in proper order, the water inlet (201) of phosphorus removal pool (2) is connected with the effluent end of biochemical pool (1), the water outlet (202) of phosphorus removal pool (2) is connected with the water inlet end of mbr membrane pool (3), the top of phosphorus removal pool (2) is equipped with medicament dosing mouth, be equipped with stirring part (4) in phosphorus removal pool (2), the distance between water outlet (202) and the bottom surface of phosphorus removal pool (2) is greater than the distance between the blade of stirring part (4) and the bottom surface of phosphorus removal pool (2).

2. A sewage treatment system as claimed in claim 1, wherein, The stirring part (4) includes a paddle (401), a drive rod (402), and a rotary motor (403). The drive end of the rotary motor (403) is connected with the drive rod (402). The paddle (401) is fixedly connected at the bottom of the drive rod (402). There are several paddles (401), and the several paddles (401) are arranged in a circle at the bottom of the drive rod (402) with the axis of the drive rod (402) as the rotation center.

3. A sewage treatment system as claimed in claim 2, wherein, The width of the paddle (401) near one end of the drive rod (402) is greater than the width of the paddle (401) away from the other end of the drive rod (402).

4. A sewage treatment system as claimed in claim 3, wherein, The acute angle between the end of the paddle (401) connected with the drive rod (402) and the axis of the drive rod (402) is 5°-25°.

5. The sewage treatment system of claim 1, wherein A filter screen (5) is arranged on the water outlet (202) to prevent sediment from entering the mbr membrane pool (3). The filter screen (5) covers the water outlet (202).

6. A sewage treatment system as claimed in claim 5, wherein, An aeration pipe (6) is also arranged on the water outlet (202). The aeration pipe (6) is located on the side of the filter screen (5) close to the mbr membrane pool (3). The aeration pipe (6) is connected with a gas source. An aeration head is arranged on the aeration pipe (6). The gas outlet end of the aeration head faces the filter screen (5). The aeration head can aerate the filter screen (5).

7. A sewage treatment system as claimed in claim 5, wherein A cleaning part is arranged on the water outlet (202). The cleaning part includes a connecting rod (8) and a cleaning head (7). A slide rail is arranged in the water outlet (202). The axis of the slide rail is parallel to the filter screen (5). The cleaning head (7) is located in the slide rail and is slidingly connected with the slide rail. The cleaning head (7) can remove the sediment adhered to the filter screen (5). One end of the connecting rod (8) is fixedly connected with the cleaning head (7), and the other end extends to the outside of the phosphorus removal pool (2).

8. The sewage treatment system of claim 1, wherein, A discharge port (203) is arranged on the side wall of the phosphorus removal pool (2). The discharge port (203) is located at the bottom of the side wall of the phosphorus removal pool (2). A gate (9) is arranged on the discharge port (203).

9. A sewage treatment system as claimed in claim 8, wherein, The bottom surface of the phosphorus removal pool (2) is an inclined bottom surface. The distance between one end of the inclined bottom surface of the phosphorus removal pool (2) close to the discharge port (203) and the top of the phosphorus removal pool (2) is greater than the distance between the other end of the inclined bottom surface of the phosphorus removal pool (2) away from the discharge port (203) and the top of the phosphorus removal pool (2).

10. The sewage treatment system of claim 8, wherein, The water outlet (202) has several, each water outlet (202) is connected with one mbr membrane tank (3), the stirring part (4) also has several, each stirring part (4) corresponds to one water outlet (202).

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