CN118791105A - Domestic sewage treatment device and method - Google Patents

Abstract

The invention relates to the technical field of domestic sewage treatment and discloses a domestic sewage treatment device and method, wherein the domestic sewage treatment device comprises a sewage conveying canal and a spraying pipeline erected above the sewage conveying canal, a first rolling piece and a second rolling piece are arranged in the sewage conveying canal side by side, the spraying pipeline is positioned between the first rolling piece and the second rolling piece, a rotating plate rotates anticlockwise, the flow velocity difference between upper-layer sewage and lower-layer sewage at the point A is effectively reduced, sediment precipitated in the lower-layer sewage at the point B is upwards billowed and the upper-layer sewage at the middle of the point A to the point B are mixed, the sediment is uniformly mixed with polymer solution sprayed by the spraying pipeline, the uniformity of phosphorus reaction between the polymer solution and the sewage is improved, the treatment efficiency is improved, when the polymer solution is sprayed by the spraying pipeline to the sewage mixed with sediment, the sediment contacts with the sediment in the sewage, the flocculated in the sewage is flocculated by using the sediment particles as carriers, the flocculated particles are increased in weight, and the flocculated particles are more rapidly precipitated in a sedimentation tank, and the sedimentation efficiency is improved.

Description

Domestic sewage treatment device and method

Technical Field

The present invention relates to the technical field of domestic sewage treatment, and in particular to a domestic sewage treatment device and method.

Background Art

After the initial filtration of domestic sewage, it needs to flow through a sewage channel and enter the sedimentation tank for flocculation and sedimentation. In the process of sewage flowing through the sewage channel, polymer solution is sprayed into the flowing sewage to react with the high concentration of phosphorus in the sewage, converting the phosphorus from liquid to solid. During the flow and transportation of sewage, it reacts with the polymer solution and can be directly precipitated when entering the sedimentation tank.

Since the polymer solution is added during the sewage transportation process, there will be a lot of silt in the domestic sewage when it enters the sewage channel after preliminary filtration. When flowing in the sewage channel, the silt sinks to the bottom of the sewage channel due to weight. During the flow of domestic sewage, the sewage in the bottom layer is affected by the silt and the friction with the sewage channel, resulting in different flow rates of the top and bottom domestic sewage. When the polymer solution is sprayed into the domestic sewage in the sewage channel, it first contacts and reacts with the upper sewage. Due to the difference in flow rate, the polymer solution cannot be well mixed with the lower sewage, resulting in uneven reaction between the upper and lower layers of sewage transported in the sewage channel, affecting the sewage treatment effect.

Therefore, a domestic sewage treatment device and method are invented.

Summary of the invention

The object of the present invention is to provide a domestic sewage treatment device and method to solve the above-mentioned problem that due to the flow rate difference, the polymer solution cannot be well mixed with the lower sewage, resulting in uneven reaction between the upper and lower layers of the sewage transported in the sewage channel, affecting the sewage treatment effect.

To achieve the above object, the present invention provides the following technical solution: a domestic sewage treatment device, comprising a sewage conveying channel and a spray pipe erected above the sewage conveying channel, wherein a first tumbling member and a second tumbling member are arranged side by side in the sewage conveying channel, and the spray pipe is located between the first tumbling member and the second tumbling member;

The power shaft of the first rolling member is connected to the driving member, and the power shafts of the first rolling member and the second rolling member are driven by gears. The driving member drives the first rolling member to rotate counterclockwise, and under the action of the gear transmission, the second rolling member rotates clockwise;

The installation point of the first tumbling member and the sewage conveying channel is point A, and the installation point of the second tumbling member and the sewage conveying channel is point B. When the domestic sewage flows through point A in the sewage conveying channel, the first tumbling member rotates counterclockwise to generate resistance to the upper sewage flowing at point A in the sewage conveying channel, so as to reduce the flow velocity difference between the upper sewage and the lower sewage at point A. When the second tumbling member rotates clockwise, it generates resistance to the lower sewage flowing at point B in the sewage conveying channel, so as to cause the sediment precipitated in the lower sewage at point B to surge upward and mix with the upper sewage between points A and B.

The first tumbling member comprises a tumbling shaft connected to the output shaft of the driving member, and a plurality of rotating plates 1 arranged in an annular array on the outer surface of the tumbling shaft;

The second rolling member includes a rotating rod and a plurality of rotating plates 2 which are arranged in a circular array on the outer surface of the rotating rod.

Preferably, each of the two rotating plates is provided with a flow groove for sewage to flow through, and the flow groove is a long groove opened along the length direction of the two rotating plates, and each of the two rotating plates is installed with a closing support plate for closing the flow groove.

Preferably, a plurality of guide vanes are installed in the array in the through-flow groove, and the blades of the guide vanes are arc-shaped;

Both ends of the closed support plate are vertically extended and connected with moving blocks, and the rotating plate 2 is provided with a sliding groove for moving the moving block and the closed support plate.

Preferably, a screw rod and a limit rod are respectively installed inside the two ends of the rotating plate, one moving block is sleeved on the screw rod, and the other moving block is sleeved on the limit rod.

Preferably, an adjustment plate is fixed on the inner wall of the sewage conveying channel, and a first arc-shaped rack and a second arc-shaped rack with two teeth openings facing each other are arranged on the adjustment plate, and the first arc-shaped rack and the second arc-shaped rack are coaxially staggered.

Preferably, the second arc-shaped rack is connected to the outer wall of the adjustment disk through an arc-shaped extension plate, and the first arc-shaped rack is fixed to the end surface of the adjustment disk close to the second tumbling member.

Preferably, a transmission gear is installed at one end of the screw rod, and the transmission gear is intermittently meshed with the first arc-shaped rack and the second arc-shaped rack respectively, and a groove for accommodating the transmission gear is opened on the second rotating plate.

Preferably, a driving disk is fixed on the inner wall of the sewage conveying channel, and a cam groove is opened on the driving disk. The convex groove of the cam groove faces the bottom end of the sewage conveying channel, and the concave groove of the cam groove faces the top opening of the sewage conveying channel. A side shaft rod is provided at one end of the closed support plate facing the driving disk, and one end of the side shaft rod is inserted into the cam groove.

The present invention provides the following technical solution: a method for treating domestic sewage, comprising the following steps:

S1: Domestic sewage first passes through point A during its flow in the sewage conveying channel. When passing through point A, the driving member drives the flip shaft and a plurality of rotating plates to rotate counterclockwise. When rotating plate 1 flips from the bottom end of the sewage conveying channel to the top, it generates resistance to the upper sewage flowing at point A, so as to reduce the flow rate of the upper sewage.

S2: When the turning shaft rotates, the rotating rod is driven to rotate clockwise through the gear, and the rotating rod drives several rotating plates 2 to rotate clockwise. When the rotating plate 2 is turned to the bottom of the sewage conveying channel, it will produce resistance to the lower sewage and sediment flowing at point B, and the lower sewage and sediment will surge to the upper part and mix with the upper sewage between point A and point B;

S3: When the rotating plate 2 rotates from a horizontal state to a vertical state with its end face facing the upper end of the sewage conveying channel, the closed support plate on the rotating plate 2 moves toward the rotating rod to open the flow slot. When the surging sewage and sediment pass through the flow slot, they drive multiple guide impellers to rotate, forming a small vortex to mix the sediment in the sewage;

S4: while the first tumbling part and the second tumbling part are tumbling the sewage, multiple spraying points on the spray pipe continuously spray the polymer solution on the sewage between point A and point B, the polymer solution is mixed with the tumbling and mixed sewage and sediment, reacts with the high concentration of phosphorus in the sewage, and converts the phosphorus from liquid to solid for flocculation;

S5: The treated sewage is then transported to the sedimentation tank through the sewage transport channel for sedimentation.

Technical effects and advantages of the present invention:

1. The first tumbling member of the present invention comprises a tumbling shaft connected to the output shaft of the driving member, and a plurality of rotating plates 1 installed in a circular array on the outer surface of the tumbling shaft. The rotating plate 1 rotates counterclockwise. When it is turned upward, its rotation direction is opposite to the flow direction of the upper sewage, thereby forming resistance to the sewage flowing in the upper layer, effectively reducing the flow velocity difference between the upper and lower sewage at point A. When the second tumbling member rotates clockwise, it generates resistance to the lower sewage flowing at point B in the sewage conveying channel, and is used to roll up the sediment precipitated in the lower sewage at point B and mix it with the upper sewage between points A and B, and evenly mix it with the polymer solution sprayed from the spray pipe, thereby improving the uniformity of the reaction between the polymer solution and phosphorus in the sewage and improving the treatment efficiency.

2. In the present invention, each rotating plate is provided with a flow groove for sewage to flow through, and each rotating plate is installed with a closing support plate for closing the flow groove. A plurality of guide impellers are installed in an array in the flow groove, and the blades of the guide impeller are arc-shaped. When sewage mixed with sediment flows through the flow groove, the resistance generated between the sewage flow and the guide impeller is used to drive the guide impeller to rotate, and the sewage mixed with sediment is vertically stirred to ensure that the sediment surging to the top is mixed with the sewage and dispersed more evenly. When the spray pipe sprays the polymer solution on the sewage mixed with sediment, it contacts the sediment in the sewage, so that the flocculants in the sewage are flocculated with the sediment particles as carriers, so that the weight of the flocculated particles is increased, and the particles are precipitated more quickly when entering the sedimentation tank, thereby improving the sedimentation efficiency.

3. The closed support plate of the present invention moves in the direction away from the rotating rod, and the closed support plate closes the flow channel. At this time, the rotating plate 2 continues to rotate. When it rotates to the bottom of the sewage conveying channel, the flow channel is closed to prevent the silt to be churned at the bottom of the sewage conveying channel from flowing through the flow channel. The flow channel is adaptively opened and closed by the closed support plate, and the silt is mixed and stirred after being effectively churned, thereby improving the sewage treatment efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

FIG2 is a side view of the overall structure of the present invention;

FIG3 is a schematic structural diagram of a first tumbling member and a second tumbling member of the present invention;

FIG4 is a schematic diagram of the structure of a second rolling member of the present invention;

FIG5 is a side view of the second rolling member structure of the present invention;

FIG6 is an enlarged view of point A in FIG5 of the present invention;

FIG7 is a schematic diagram of the split structure of the second rolling member and the adjustment plate of the present invention;

FIG8 is a cross-sectional plan view of a sewage conveying channel according to the present invention;

FIG9 is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

FIG. 10 is a schematic diagram of the separated structure of the adjustment disk and the second rolling member according to the second embodiment of the present invention.

In the figure: 1, sewage conveying channel; 2, spray pipe; 3, first tumbling member; 31, flip shaft; 32, turn plate one; 4, second tumbling member; 41, rotating rod; 42, turn plate two; 421, screw rod; 4211, transmission gear; 43, flow groove; 431, guide impeller; 44, closed support plate; 441, moving block; 442, side shaft; 5, adjustment plate; 51, first arc-shaped rack; 52, second arc-shaped rack; 6, drive plate; 61, cam groove.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment 1, referring to Figures 1 to 8, is the first embodiment of the present invention, which provides a domestic sewage treatment device, including a sewage conveying channel 1 and a spray pipe 2 erected above the sewage conveying channel 1, wherein a first tumbling member 3 and a second tumbling member 4 are arranged side by side in the sewage conveying channel 1, and the spray pipe 2 is located between the first tumbling member 3 and the second tumbling member 4, and a plurality of nozzles are arranged on the spray pipe 2, and the nozzles spray in a ring state, and when the first tumbling member 3 and the second tumbling member 4 rotate in opposite directions, the sewage between the first tumbling member 3 and the second tumbling member 4 is tumbled while the nozzles continue to spray a polymer solution into the sewage between the first tumbling member 3 and the second tumbling member 4, and the tumbling sewage is evenly mixed with the polymer solution.

The power shaft of the first tumbling member 3 is connected to the driving member, and the power shafts of the first tumbling member 3 and the second tumbling member 4 are driven by gears. The driving member drives the first tumbling member 3 to rotate counterclockwise. Under the action of the gear transmission, the second tumbling member 4 rotates clockwise. The installation position of the first tumbling member 3 and the sewage conveying channel 1 is point A, and the installation position of the second tumbling member 4 and the sewage conveying channel 1 is point B. When the domestic sewage flows through point A in the sewage conveying channel 1, the first tumbling member 3 rotates counterclockwise to generate resistance to the upper sewage flowing at point A in the sewage conveying channel 1, so as to reduce the flow velocity difference between the upper sewage and the lower sewage at point A. When the second tumbling member 4 rotates clockwise, it generates resistance to the lower sewage flowing at point B in the sewage conveying channel 1, so as to roll up the sediment precipitated in the lower sewage at point B and mix it with the upper sewage between points A and B, and evenly mix it with the polymer solution sprayed by the spray pipe 2, so as to improve the uniformity of the reaction between the polymer solution and phosphorus in the sewage and improve the treatment efficiency.

The first tumbling member 3 includes a flip shaft 31 connected to the output shaft of the driving member, and a plurality of rotating plates 32 installed in a circular array on the outer surface of the flip shaft 31. The rotating plate 32 rotates counterclockwise. When flipped upward, its rotation direction is opposite to the flow direction of the upper sewage, thereby forming resistance to the sewage flowing in the upper layer, and effectively reducing the flow velocity difference between the upper and lower sewage at point A.

The second tumbling member 4 includes a rotating rod 41 and a plurality of rotating plates 42 installed in a circular array on the outer surface of the rotating rod 41. The rotating rod 41 rotates clockwise, and the rotating rod 41 drives the plurality of rotating plates 42 to rotate clockwise. When the rotating plates 42 flip to the bottom of the sewage conveying channel 1, resistance is generated to the lower sewage and silt flowing at point B, and the lower sewage and silt are flipped upward to mix with the upper sewage between point A and point B.

Each rotating plate 42 is provided with a flow groove 43 for sewage to flow through, and the flow groove 43 is a long groove provided along the length direction of the rotating plate 42, and each rotating plate 42 is installed with a closing support plate 44 for closing the flow groove 43, and a plurality of guide impellers 431 are installed in an array in the flow groove 43, and the blades of the guide impellers 431 are arc-shaped. When sewage mixed with sediment flows through the flow groove 43, the resistance generated between the sewage flow and the guide impellers 431 is used to drive the guide impellers 431 to rotate, and the sewage mixed with sediment is vertically stirred to ensure that the sediment surging to the top is mixed with the sewage and dispersed more evenly. When the spray pipe 2 sprays the polymer solution on the sewage mixed with sediment, it contacts the sediment in the sewage, so that the flocculants in the sewage are flocculated with the sediment particles as carriers, so that the weight of the flocculated particles is increased, and the particles are precipitated more quickly when entering the sedimentation tank, thereby improving the sedimentation efficiency.

A screw rod 421 and a limit rod are installed inside the two ends of the rotating plate 42 respectively, and a moving block 441 is vertically extended and connected to the two ends of the closed support plate 44. One moving block 441 is sleeved on the screw rod 421, and the other moving block 441 is sleeved on the limit rod. An adjustment disk 5 is fixed on the inner wall of the sewage conveying channel 1. The adjustment disk 5 is provided with a first arc-shaped rack 51 and a second arc-shaped rack 52 with two teeth opposite to each other. The first arc-shaped rack 51 and the second arc-shaped rack 52 are coaxially staggered. The second arc-shaped rack 52 is connected to the outer wall of the adjustment disk 5 through an arc-shaped extension plate. The first arc-shaped rack 51 is fixed to the end of the adjustment disk 5 close to the second tumbling member 4. A transmission gear 4211 is installed at one end of the screw rod 421, and the transmission gear 4211 is intermittently meshed with the first arc-shaped rack 51 and the second arc-shaped rack 52 respectively. A sliding groove for moving the moving block 441 and the closed support plate 44 is opened on the rotating plate 42, and a groove for accommodating the transmission gear 4211 is opened on the rotating plate 42. When the rotating plate 42 moves to one end of the first arc-shaped rack 51, the closed support plate 44 on the rotating plate 42 is in a state of closing the flow groove 43. When the rotating plate 42 rotates through the first arc-shaped rack 51, the transmission gear 4211 meshes with the first arc-shaped rack 51 and drives the transmission gear 4 211 and the screw rod 421 rotate counterclockwise, driving the moving block 441 and the closed support plate 44 to move in the direction close to the rotating rod 41, so that the closed support plate 44 opens the through-flow groove 43, allowing the sewage and silt after surging to pass through the through-flow groove 43, so as to drive the multiple guide impellers 431 to rotate to stir the sewage and silt more evenly. When the rotating plate 42 rotates and passes through the second arc-shaped rack 52, during this process, the transmission gear 4211 meshes with the second arc-shaped rack 52, and drives the transmission gear 4211 and the screw rod 421 to rotate clockwise, driving the moving block 441 and the closed support plate 44 to move in the direction away from the rotating rod 41. The closed support plate 44 closes the flow groove 43. At this time, the rotating plate 2 42 continues to rotate. When it rotates to the bottom of the sewage conveying channel 1, the flow groove 43 is closed to prevent the silt to be churned at the bottom of the sewage conveying channel 1 from flowing through the flow groove 43. The flow groove 43 is adaptively opened and closed by the closed support plate 44. After the silt is effectively churned, it is mixed and stirred to improve the sewage treatment efficiency. In order to make the movement process of the closed support plate 44 smoother, the adjustment plate 5 and the first arc-shaped rack 51 and the second arc-shaped rack 52 in this solution can be equipped with two, which are symmetrically arranged on the inner wall of the sewage conveying channel 1, and the rotating plate 2 42 is adaptively adjusted.

1 to 8, a method for treating domestic sewage is provided, comprising the following steps:

S1: Domestic sewage first passes through point A during its flow in the sewage conveying channel 1. When passing through point A, the driving member drives the flip shaft 31 and a plurality of rotating plates 32 to rotate counterclockwise. When the rotating plates 32 flip from the bottom end of the sewage conveying channel 1 to the top, resistance is generated to the upper sewage flowing at point A, so as to reduce the flow rate of the upper sewage.

S2: The turning shaft 31 rotates and drives the rotating rod 41 to rotate clockwise through the gears. The rotating rod 41 drives a plurality of rotating plates 42 to rotate clockwise. When the rotating plates 42 are turned to the bottom of the sewage conveying channel 1, resistance is generated to the lower sewage and silt flowing at point B, and the lower sewage and silt are turned up to mix with the upper sewage between point A and point B.

S3: When the rotating plate 42 rotates from a horizontal state to a vertical state with its end face facing the upper end of the sewage conveying channel 1, the closed support plate 44 on the rotating plate 42 moves toward the rotating rod 41 to open the flow groove 43. When the surging sewage and sediment pass through the flow groove 43, the multiple guide impellers 431 are driven to rotate, forming a small vortex scene to mix the sediment in the sewage;

S4: When the second rotating plate 42 moves to one end of the first arc-shaped rack 51, the closed support plate 44 on the second rotating plate 42 is in a state of closing the flow groove 43. When the second rotating plate 42 rotates past the first arc-shaped rack 51, the transmission gear 4211 meshes with the first arc-shaped rack 51, and drives the transmission gear 4211 and the screw rod 421 to rotate counterclockwise, driving the moving block 441 and the closed support plate 44 to move toward the direction close to the rotating rod 41, so that the closed support plate 44 opens the flow groove 43, allowing the turbulent sewage and sediment to pass through the flow groove 43;

S5: When the second rotating plate 42 rotates past the second arc-shaped rack 52, during this process, the transmission gear 4211 meshes with the second arc-shaped rack 52, and drives the transmission gear 4211 and the screw rod 421 to rotate clockwise, driving the moving block 441 and the closed support plate 44 to move away from the rotating rod 41, and the closed support plate 44 closes the flow groove 43. At this time, the second rotating plate 42 continues to rotate. When it rotates to the bottom of the sewage conveying channel 1, the flow groove 43 is closed to prevent the sediment to be turned over at the bottom of the sewage conveying channel 1 from flowing through the flow groove 43;

S6: while the first tumbling member 3 and the second tumbling member 4 are tumbling the sewage, the multiple spraying points on the spray pipe 2 continuously spray the polymer solution on the sewage between point A and point B. The polymer solution is mixed with the tumbling and mixed sewage and sediment, and reacts with the high concentration of phosphorus in the sewage to convert the phosphorus from liquid to solid for flocculation;

S7: The treated sewage is then transported to a sedimentation tank through the sewage transport channel 1 for sedimentation.

Embodiment 2, referring to FIGS. 9 and 10 , is a second embodiment of the present invention, which is different from the first embodiment in that the present invention further provides another structure for driving the movement of the closed support plate 44, including a driving plate 6 fixed on the inner wall of the sewage conveying channel 1, a cam groove 61 being provided on the driving plate 6, the convex groove of the cam groove 61 being directed toward the bottom end of the sewage conveying channel 1, the concave groove of the cam groove 61 being directed toward the top opening of the sewage conveying channel 1, limiting grooves for the sliding installation of the closed support plate 44 being provided on both sides of the rotating plate 42, a side shaft rod 442 being provided at one end of the closed support plate 44 facing the driving plate 6, one end of the side shaft rod 442 being inserted and arranged in the cam groove 61, the second rolling member 4 rotates, and when the rotating plate 42 rotates to a horizontal state and close to point A, the side shaft rod 442 rotates until the convex groove of the cam groove 61 is engaged with the concave groove. When the rotating plate 42 continues to rotate and the side shaft 442 moves from the convex groove to the concave groove along the cam groove 61, the closed support plate 44 is pulled to move along the rotating plate 42 toward the rotating rod 41, so that the through-flow groove 43 is opened, and the through-flow groove 43 is always in an open state during the rotation of the side shaft 442 at the concave groove of the cam groove 61. When the rotating plate 42 rotates to away from point A and is in a horizontal state, the side shaft 442 rotates to the junction of the concave groove and the convex groove of the cam groove 61, and the rotating plate 42 continues to rotate, and the side shaft 442 moves from the concave groove to the convex groove along the cam groove 61, the closed support plate 44 is pulled to move along the rotating plate 42 away from the rotating rod 41, and the closed support plate 44 closes the through-flow groove 43. During the rotation of the side shaft 442 at the convex groove of the cam groove 61, the through-flow groove 43 is always in a closed state.

Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a domestic sewage treatment device, includes sewage delivery canal (1) and erects spray pipe (2) in sewage delivery canal (1) top, its characterized in that: a first rolling piece (3) and a second rolling piece (4) are arranged in the sewage conveying channel (1) side by side, and the spraying pipeline (2) is positioned between the first rolling piece (3) and the second rolling piece (4);

The power shaft of the first rolling piece (3) is connected with the driving piece, the power shafts of the first rolling piece (3) and the second rolling piece (4) are driven by a gear, the driving piece drives the first rolling piece (3) to rotate anticlockwise, and the second rolling piece (4) rotates clockwise under the action of the gear;

The installation position of the first rolling piece (3) and the sewage conveying channel (1) is the point A, the installation position of the second rolling piece (4) and the sewage conveying channel (1) is the point B, when domestic sewage flows in the sewage conveying channel (1) and passes through the point A, the first rolling piece (3) rotates anticlockwise to generate resistance to upper sewage flowing in the point A in the sewage conveying channel (1) and is used for reducing the flow velocity difference between the upper sewage and the lower sewage in the point A, and the second rolling piece (4) rotates clockwise to generate resistance to lower sewage flowing in the point B in the sewage conveying channel (1) and is used for mixing sediment precipitated in the lower sewage in the point B with the upper sewage in the middle of the point A to the point B;

The first rolling piece (3) comprises a turning shaft lever (31) connected with the output shaft of the driving piece, and a plurality of turning plates I (32) which are annularly arranged on the outer surface of the turning shaft lever (31);

The second rolling piece (4) comprises a rotary rod (41) and a plurality of rotary plates II (42) which are arranged on the outer surface of the rotary rod (41) in an annular array.

2. The domestic sewage treatment apparatus according to claim 1, wherein: and each rotating plate II (42) is provided with a flow through groove (43) for sewage to flow through, the flow through grooves (43) are long grooves formed in the length direction of the rotating plate II (42), and each rotating plate II (42) is provided with a sealing support plate (44) for sealing the flow through grooves (43).

3. The domestic sewage treatment apparatus according to claim 2, wherein: a plurality of guide impellers (431) are arranged in the through flow groove (43) in an array mode, and blades of the guide impellers (431) are arc-shaped;

The two ends of the sealing support plate (44) are vertically connected with moving blocks (441) in an extending mode, and sliding grooves used for moving the moving blocks (441) and the sealing support plate (44) are formed in the second rotating plate (42).

4. A domestic sewage treatment apparatus according to claim 3, wherein: screw rods (421) and limiting rods are respectively arranged in two ends of the rotating plate II (42), one moving block (441) is sleeved on the screw rods (421), and the other moving block (441) is sleeved on the limiting rods.

5. The domestic sewage treatment apparatus according to claim 4, wherein: an adjusting disc (5) is fixed on the inner wall of the sewage conveying channel (1), a first arc-shaped rack (51) and a second arc-shaped rack (52) with two opposite tooth openings are arranged on the adjusting disc (5), and the first arc-shaped rack (51) and the second arc-shaped rack (52) are coaxially staggered.

6. The domestic sewage treatment apparatus according to claim 5, wherein: the second arc-shaped rack (52) is connected with the outer wall of the adjusting disc (5) through an arc-shaped extension plate, and the first arc-shaped rack (51) is fixed on the end face of one side, close to the second rolling piece (4), of the adjusting disc (5).

7. The domestic sewage treatment apparatus according to claim 6, wherein: one end of the screw rod (421) is provided with a transmission gear (4211), the transmission gear (4211) is respectively meshed with the first arc-shaped rack (51) and the second arc-shaped rack (52) in an intermittent mode, and a groove for accommodating the transmission gear (4211) is formed in the second rotating plate (42).

8. A domestic sewage treatment apparatus according to claim 3, wherein: a driving disc (6) is fixed on the inner wall of the sewage conveying channel (1), a cam groove (61) is formed in the driving disc (6), a convex groove of the cam groove (61) faces towards the bottom end of the sewage conveying channel (1), a concave groove of the cam groove (61) faces towards the top end opening of the sewage conveying channel (1), a side shaft lever (442) is arranged at one end, facing the driving disc (6), of the sealing support plate (44), and one end of the side shaft lever (442) is inserted and arranged in the cam groove (61).

9. A domestic sewage treatment method applied to the domestic sewage treatment apparatus of claim 7, characterized by comprising the steps of:

S1: the domestic sewage passes through the point A in the flowing process of the sewage conveying channel (1), when passing through the point A, the driving piece drives the overturning shaft rod (31) and the rotating plates I (32) to rotate anticlockwise, and the rotating plates I (32) generate resistance to the upper sewage flowing at the point A when overturning from the bottommost end of the sewage conveying channel (1) to the upper part, so that the flow rate of the upper sewage is reduced;

S2: the turnover shaft lever (31) rotates and drives the rotary rod (41) to rotate clockwise through a gear, the rotary rod (41) drives the rotary plates II (42) to rotate clockwise, resistance is generated to lower sewage and sediment flowing at the point B when the rotary plates II (42) turn to the bottommost end of the sewage conveying channel (1), and the lower sewage and sediment are turned over to be mixed with upper sewage between the point A and the point B;

S3: in the process that the rotating plate II (42) rotates from a horizontal state to a vertical state and the end face of the rotating plate II faces the upper end of the sewage conveying channel (1), the sealing support plate (44) on the rotating plate II (42) moves to the direction close to the rotating rod (41) to open the through-flow groove (43), and when the sewage and sediment after the billowing pass through the through-flow groove (43), the plurality of guide impellers (431) are driven to rotate to form small vortex flows to uniformly mix the sediment in the sewage;

s4: while the first rolling piece (3) and the second rolling piece (4) are used for flushing sewage, a plurality of spraying points on the spraying pipeline (2) are used for continuously spraying polymer solution on the sewage between the point A and the point B, the polymer solution is mixed with the sewage and sediment which are uniformly mixed in a rolling way, and the polymer solution reacts with high-concentration phosphorus in the sewage to convert the phosphorus from liquid into solid for flocculation;

s5: and then the treated sewage is conveyed into a sedimentation tank for sedimentation by a sewage conveying channel (1).