Flocculation apparatus and wastewater treatment system

Abstract

The application discloses a kind of flocculation equipment and wastewater treatment system, the flocculation equipment includes: cylinder and stirring mechanism, cavity is formed in cylinder, cavity includes the mixing zone and flocculation zone being communicated, stirring mechanism is inserted in cavity, and stirring mechanism includes rotating shaft and first stirring paddle unit and second stirring paddle unit being sequentially arranged on rotating shaft, first stirring paddle unit is located in mixing zone, second stirring paddle unit is located in flocculation zone, rotating shaft rotation drives first stirring paddle unit and second stirring paddle unit rotation, to make water flow speed in mixing zone greater than water flow speed in flocculation zone.Visibly, the flocculation equipment can simultaneously meet the conditions of mixing zone and flocculation zone reagent mixing, thus, when need to make flocculation equipment work, only need to drive rotating shaft to make first stirring paddle unit and second stirring paddle unit simultaneously rotate to realize above-mentioned stirring requirement.Visibly, the flocculation equipment is convenient to operate, and mechanical structure is simple, and energy consumption is lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a flocculation device and a wastewater treatment system. BACKGROUND

[0002] Coagulation sedimentation technology occupies an important position in water treatment technology, and colloidal substances in wastewater that cannot be removed by natural sedimentation can be treated by this method.

[0003] Generally, the purification equipment used in coagulation sedimentation technology mainly includes a mixing tank, a flocculation tank, a sedimentation tank, a first agitator arranged in the mixing tank, and a second agitator arranged in the flocculation tank, and the operating principle is as follows: wastewater is discharged into the mixing tank, a coagulant is added to the mixing tank, the first agitator is stirred to make the colloidal particles in the wastewater coagulate and destabilize, then the wastewater is discharged into the flocculation tank, a flocculant is added to the flocculation tank, and the second agitator is stirred to make the colloidal and dispersed particles in the wastewater generate flocculation under the interaction of molecular forces, the flocculation collides and coagulates with each other, and the size and mass of the flocculation continuously increase, finally, the wastewater containing the flocculation is discharged into the sedimentation tank, the flocculation in the sedimentation tank is separated from the water phase under the action of gravity and is precipitated, and finally the wastewater purification effect is achieved. However, in the above purification equipment, the mixing tank, the flocculation tank and the sedimentation tank are designed separately, which increases the occupied area and increases the purification cost. In order to overcome the above problems, a tank-type coagulation separator integrating mixing, flocculation and sedimentation has appeared on the market, which can effectively reduce the area occupied by the entire purification equipment, but the tank-type coagulation separator has high energy consumption and the operation process is complicated. SUMMARY

[0004] Therefore, it is necessary to provide a flocculation device and a wastewater treatment system which are convenient to operate and have low energy consumption in view of the above problems.

[0005] A flocculation device comprises a cylinder and an agitating mechanism, the cylinder has a cavity formed therein, the cavity comprises a mixing zone and a flocculation zone which are connected in series, the agitating mechanism is inserted into the cavity, and the agitating mechanism comprises a rotating shaft and a first agitating paddle unit and a second agitating paddle unit which are arranged on the rotating shaft in sequence, the first agitating paddle unit is located in the mixing zone, the second agitating paddle unit is located in the flocculation zone, and the rotating shaft drives the first agitating paddle unit and the second agitating paddle unit to rotate, so that the water flow speed in the mixing zone is greater than the water flow speed in the flocculation zone.

[0006] In the flocculation device, the cavity in the cylinder is divided into a mixing zone and a flocculation zone in communication, the rotating shaft is inserted into the cavity, and the rotating shaft is provided with a first stirring paddle unit and a second stirring paddle unit, wherein the first stirring paddle unit is located in the mixing zone, the second stirring paddle unit is located in the flocculation zone, and when the first stirring paddle unit and the second stirring paddle unit rotate, the water flow speed in the mixing zone is greater than that in the flocculation zone. It can be seen that the flocculation device can simultaneously meet the mixing conditions of the mixing zone and the flocculation zone. Therefore, when the flocculation device needs to work, the first stirring paddle unit and the second stirring paddle unit can be driven to rotate simultaneously to achieve the above stirring requirements. It can be seen that the flocculation device is convenient to operate, the mechanical structure is simple, and the energy consumption is low.

[0007] The technical solutions are further described below:

[0008] In one embodiment, the first stirring paddle unit includes a first stirring paddle, and the second stirring paddle unit includes a second stirring paddle, a third stirring paddle and a fourth stirring paddle which are sequentially and spacedly arranged along the axial direction of the rotating shaft. The second stirring paddle is arranged adjacent to the first stirring paddle. The number of paddle blades of the first stirring paddle is greater than that of the second stirring paddle. The number of paddle blades of the second stirring paddle is greater than that of the third stirring paddle. The number of paddle blades of the third stirring paddle is greater than that of the fourth stirring paddle.

[0009] In one embodiment, the paddle blades of the third stirring paddle are provided with first perforations, and the paddle blades of the fourth stirring paddle are provided with second perforations. The area of the second perforations is greater than that of the first perforations.

[0010] In one embodiment, the cylinder wall of the cylinder is sequentially provided with a water inlet, a coagulant inlet, a flocculating agent inlet and a drainage outlet from bottom to top. The water inlet and the coagulant inlet are located in the mixing zone and communicate with the mixing zone. The flocculating agent inlet and the drainage outlet are respectively located at two ends of the flocculation zone and communicate with the flocculation zone. The drainage outlet is located on the side of the fourth stirring paddle away from the third stirring paddle.

[0011] The application also provides a wastewater treatment system, which comprises a tank body and the flocculation device of claim 4. The tank body is provided with a sedimentation cavity. The cylinder is arranged in the sedimentation cavity, and the drainage outlet communicates with the sedimentation cavity. The tank wall of the tank body is provided with a liquid discharge port, and the height of the liquid discharge port is lower than that of the drainage outlet along the height direction of the tank body.

[0012] In one of the embodiments, the wastewater treatment system further comprises a water inlet pipe, the tank wall of the tank body is further provided with a mounting opening, and one end of the water inlet pipe penetrates through the mounting opening and communicates with the water inlet opening, and the other end of the water inlet pipe is provided with a liquid inlet opening for the wastewater.

[0013] In one of the embodiments, the wastewater treatment system further comprises a medicament inlet pipe, and two medicament inlet pipes are provided, the tank wall of the tank body is further provided with a medicament inlet opening, the two medicament inlet pipes are arranged at the medicament inlet opening, and one of the medicament inlet pipes communicates with the coagulant opening, and the other medicament inlet pipe communicates with the flocculant opening.

[0014] In one of the embodiments, the wastewater treatment system further comprises an annular water blocking member and an inclined pipe assembly, the annular water blocking member is arranged in the sedimentation cavity and is sleeved on the outer wall of the cylinder body, a water drainage channel is formed between the cylinder body and the annular water blocking member, the water drainage channel communicates with the water drainage opening and the sedimentation cavity, and the inclined pipe assembly is arranged between the tank wall of the tank body and the annular water blocking member and surrounds the annular water blocking member.

[0015] In one of the embodiments, the inclined pipe assembly comprises a plurality of inclined pipes arranged in parallel with each other, the two ends of the inclined pipes are away from the annular water blocking member by the same distance, and the inclined direction of the inclined pipes is opposite to the rotation direction of the rotating shaft.

[0016] In one of the embodiments, the annular water blocking member is in a circular ring structure, the cylinder body and the tank body are in a cylindrical structure, and the cylinder body and the annular water blocking member are arranged at the center of the tank body.

[0017] In one of the embodiments, the wastewater treatment system further comprises a water collecting member, the water collecting member is arranged in the sedimentation cavity and is located above the inclined pipe assembly, and the water collecting member surrounds the annular water blocking member, the water collecting member is provided with an annular water collecting groove, and the water collecting member is provided with a water collecting hole, the water collecting hole communicates with the annular water collecting groove and the sedimentation cavity, and the annular water collecting groove communicates with the liquid outlet opening.

[0018] In one of the embodiments, the tank body is provided with a hopper, and the hopper is located at the bottom of the sedimentation cavity, and the bottom of the hopper is provided with a sludge discharge opening. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application, and are incorporated herein for explanation by reference. The present application will become more fully understood from the detailed description and accompanying drawings given below.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] In addition, the drawings are not drawn in the ratio of 1:1, and the relative sizes of the various elements are only exemplarily drawn in the drawings, but not necessarily drawn in the true ratio. In the drawings:

[0022] Figure 1 Fig. 1 is a structural schematic diagram of a flocculation device in an embodiment of the present application;

[0023] Figure 2 Fig. 2 is a structural schematic diagram of a wastewater treatment system in an embodiment of the present application.

[0024] The elements in the drawings are marked as follows:

[0025] 10, wastewater treatment system; 100, flocculation device; 110, barrel; 111, cavity; 1111, mixing area; 1112, flocculation area; 112, water inlet; 113, coagulant inlet; 114, flocculant inlet; 115, drainage outlet; 120, stirring mechanism; 121, rotating shaft; 122, first stirring paddle unit; 1221, first stirring paddle; 123, second stirring paddle unit; 1231, second stirring paddle; 1232, third stirring paddle; 12321, first perforation; 1233, fourth stirring paddle; 12331, second perforation; 124, motor; 200, tank; 210, sedimentation cavity; 211, liquid outlet; 212, mounting port; 213, medicine inlet; 214, exhaust port; 215, manhole; 220, water inlet pipe; 230, medicine inlet pipe; 240, annular water retaining member; 250, inclined pipe assembly; 260, water collecting member; 261, annular water collecting tank; 270, hopper; 271, sludge outlet. DETAILED DESCRIPTION

[0026] In order to make the above object, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0027] Please refer to Figure 1In an embodiment of the present application, a flocculation device 100 is provided, which comprises a barrel 110 and a stirring mechanism 120. The barrel 110 has a cavity 111 formed therein, and the cavity 111 comprises a mixing zone 1111 and a flocculation zone 1112 which are connected in series. The stirring mechanism 120 is inserted into the cavity 111. The stirring mechanism 120 comprises a rotating shaft 121, a first stirring paddle unit 122 and a second stirring paddle unit 123 which are arranged in series on the rotating shaft 121. The first stirring paddle unit 122 is located in the mixing zone 1111, and the second stirring paddle unit 123 is located in the flocculation zone 1112. The rotating shaft 121 rotates to drive the first stirring paddle unit 122 and the second stirring paddle unit 123 to rotate, so that the water flow speed in the mixing zone 1111 is greater than that in the flocculation zone 1112.

[0028] In the flocculation device 100 described above, the cavity 111 in the barrel 110 is divided into the mixing zone 1111 and the flocculation zone 1112 which are connected in series, the rotating shaft 121 is inserted into the cavity 111, and the rotating shaft 121 is provided with the first stirring paddle unit 122 and the second stirring paddle unit 123. The first stirring paddle unit 122 is located in the mixing zone 1111, and the second stirring paddle unit 123 is located in the flocculation zone 1112. When the first stirring paddle unit 122 and the second stirring paddle unit 123 rotate, the water flow speed in the mixing zone 1111 is greater than that in the flocculation zone 1112. It can be seen that the flocculation device 100 can simultaneously meet the mixing conditions of the mixing zone 1111 and the flocculation zone 1112. Therefore, when the flocculation device 100 needs to work, the first stirring paddle unit 122 and the second stirring paddle unit 123 can be simultaneously rotated by driving the rotating shaft 121 to achieve the above-mentioned stirring requirements. It can be seen that the flocculation device 100 is convenient to operate, has a simple mechanical structure, and has low energy consumption.

[0029] Please refer to Figure 1 In an embodiment, the stirring mechanism 120 further comprises a motor 124, and the output end of the motor 124 is connected with the rotating shaft 121. Therefore, when the motor 124 is started, the rotating shaft 121 can rotate in the clockwise or counterclockwise direction, so that the first stirring paddle unit 122 and the second stirring paddle unit 123 can be simultaneously rotated to stir the wastewater in the barrel 110.

[0030] In the coagulation technology, the mixing tank is mainly used for rapidly and uniformly mixing the reagent with the wastewater, so that the colloidal particles in the wastewater are coagulated and destabilized. Therefore, the mixing process needs to be strong, fast and short, and the reagent needs to be uniformly dispersed into the wastewater in the shortest possible time, so that the water flow in the mixing tank needs to generate accumulated turbulence. The flocculation tank is mainly used for effective collision between fine particles, so that the fine particles gradually grow into large particles for subsequent sedimentation operation, so that the turbulence in the flocculation tank needs to be soft and uniform.

[0031] In order to achieve the above-mentioned purposes, in an embodiment, as shown in Figure 1 the first stirring paddle unit 122 comprises a first stirring paddle 1221. The second stirring paddle unit 123 comprises a second stirring paddle 1231, a third stirring paddle 1232 and a fourth stirring paddle 1233 which are arranged in sequence along the axial direction of the rotating shaft 121. The second stirring paddle 1231 is arranged adjacent to the first stirring paddle 1221. The number of the blades of the first stirring paddle 1221 is greater than that of the second stirring paddle 1231, the number of the blades of the second stirring paddle 1231 is greater than that of the third stirring paddle 1232, and the number of the blades of the third stirring paddle 1232 is greater than that of the fourth stirring paddle 1233. In this way, when the rotating shaft 121 rotates, the rotational speed of the wastewater in the mixing zone 1111 can be greater than that in the flocculation zone 1112. At the same time, the water flow velocity tends to decrease and the turbulent flow tends to be gentle in the flocculation zone 1112 from the position of the second stirring paddle 1231 to the position of the fourth stirring paddle 1233. It can be seen that when the stirring mechanism 120 operates, the wastewater in the barrel 110 of the flocculation device 100 can form an effective velocity gradient difference so as to carry out the mixing and flocculation operation in different zones.

[0032] Alternatively, in other embodiments, the first stirring paddle unit 122 comprises at least one first stirring paddle 1221. The second stirring paddle unit 123 can only comprise the second stirring paddle 1231 or the third stirring paddle 1232 or the fourth stirring paddle 1233 or a combination of any two of them, or the second stirring paddle unit 123 comprises more than the second stirring paddle 1231, the third stirring paddle 1232 and the fourth stirring paddle 1233.

[0033] In order to further make the water flow in the flocculation zone 1112 from the position of the second stirring paddle 1231 to the position of the fourth stirring paddle 1233 tend to be gentle, further, in an embodiment, as shown in Figure 1 the blades of the third stirring paddle 1232 are provided with first perforations 12321, and the blades of the fourth stirring paddle 1233 are provided with second perforations 12331. The area of the second perforations 12331 is greater than that of the first perforations 12321. In this way, the effective area of the blades in contact with the wastewater can be reduced to reduce the turbulent degree of the water flow.

[0034] Specifically, in the present embodiment, each blade of the third stirring paddle 1232 is provided with a plurality of first perforations 12231, and each blade of the fourth stirring paddle 1233 is provided with only one second perforation 12331. The area of the second perforation 12331 is greater than the sum of the areas of the plurality of first perforations 12231.

[0035] In an embodiment, the barrel wall of the barrel 110 is sequentially provided with the water inlet 112, the coagulant inlet 113, the flocculant inlet 114 and the water outlet 115 from bottom to top. The water inlet 112 and the coagulant inlet 113 are both located in the mixing area 1111 and communicate with the mixing area 1111. The flocculant inlet 114 and the water outlet 115 are both located at two ends of the flocculation area 1112 and communicate with the flocculation area 1112. The water outlet 115 is located on the side of the fourth stirring paddle 1233 away from the third stirring paddle 1232. In this way, the barrel 110 can be regarded as a columnar structure extending in the vertical direction. Since the mixing area 1111 and the flocculation area 1112 are arranged longitudinally, the floor area of the barrel 110 can be effectively reduced.

[0036] Referring to Figure 1 and Figure 2 , the application further provides a wastewater treatment system 10, comprising a tank 200 and the flocculation device 100 as described above. The tank 200 is formed with a sedimentation cavity 210. The barrel 110 is arranged in the sedimentation cavity 210, and the water outlet 115 communicates with the sedimentation cavity 210. The tank wall of the tank 200 is provided with a liquid outlet 211, and the height of the liquid outlet 211 is lower than the height of the water outlet 115 along the height direction of the tank 200.

[0037] In the above wastewater treatment system 10, when wastewater is introduced into the barrel 110 from the water inlet 112, and coagulant and flocculant are introduced into the barrel 110, flocculation bodies can be formed in the wastewater under the action of the first stirring paddle unit 122 and the second stirring paddle unit 123. Since the barrel 110 is arranged in the sedimentation cavity 210, and the water outlet 115 of the barrel 110 communicates with the sedimentation cavity 210, the wastewater carrying the flocculation bodies can be directly discharged from the water outlet 115 into the sedimentation cavity 210 for sedimentation, so as to complete solid-liquid separation. The purified water after separation and purification can be directly discharged from the tank 200 through the liquid outlet 211, so as to realize water quality purification. It can be seen that the wastewater treatment system 10 can effectively perform water purification operation, and the floor area of the wastewater treatment system 10 is small, so that the capital investment is less.

[0038] Referring to Figure 1 and Figure 2 In an embodiment, the wastewater treatment system 10 further comprises a water inlet pipe 220. The tank wall of the tank 200 is further provided with a mounting hole 212. One end of the water inlet pipe 220 penetrates through the mounting hole 212 and communicates with the water inlet 112, and the other end of the water inlet pipe 220 is provided with a liquid inlet for introducing wastewater.

[0039] In order to facilitate the addition of reagents into the barrel 110, specifically, in the present embodiment, as Figure 1 and Figure 2As shown, the wastewater treatment system 10 further comprises two dosing pipes 230. The tank wall of the tank body 200 is further provided with dosing openings 213, and the two dosing pipes 230 are both arranged at the dosing openings 213. One of the dosing pipes 230 is connected to the coagulant opening 113, and the other dosing pipe 230 is connected to the flocculant opening 114.

[0040] Referring to Figure 1 and Figure 2 In an embodiment, the wastewater treatment system 10 further comprises an annular water retaining member 240 and a slant pipe assembly 250. The annular water retaining member 240 is arranged in the sedimentation cavity 210 and is sleeved on the outer wall of the cylinder body 110. The cylinder body 110 and the annular water retaining member 240 form a water discharge channel, which is connected to the water discharge opening 115 and the sedimentation cavity 210. The slant pipe assembly 250 is arranged between the tank wall of the tank body 200 and the annular water retaining member 240 and surrounds the annular water retaining member 240. By arranging the slant pipe assembly 250, the settling distance is shortened, the coalescence area is increased, the treatment capacity and the separation efficiency are improved, and the mutual disturbance of the water bodies in the sedimentation cavity 210 is reduced, which is beneficial to the deposition and coalescence of the flocculation bodies.

[0041] In an embodiment, the slant pipe assembly 250 comprises a plurality of slant pipes arranged in parallel with each other. The two ends of the slant pipes are at the same distance from the annular water retaining member 240, and the inclination direction of the slant pipes is opposite to the rotation direction of the rotating shaft 121. In this way, the probability of the wastewater containing flocculation bodies directly and massively entering the slant pipe assembly 250 during the flow process is reduced, and the reliability of the slant pipe assembly 250 in intercepting the flocculation bodies is further improved.

[0042] Specifically, the angle between the slant pipe and the horizontal plane is 60°.

[0043] In an embodiment, the annular water retaining member 240 has a circular ring structure, the cylinder body 110 and the tank body 200 have a circular cylinder structure, and the cylinder body 110 and the annular water retaining member 240 are arranged at the center of the tank body 200. In this way, when the wastewater is discharged from the water discharge channel, the wastewater can flow to the tank wall around the tank body 200 at the same time when flowing in the sedimentation cavity 210, so as to avoid the short flow phenomenon, which is beneficial to the improvement of the sedimentation surface load.

[0044] Referring to Figure 2In an embodiment, the wastewater treatment system 10 further comprises a collecting member 260. The collecting member 260 is arranged in the sedimentation chamber 210 above the inclined pipe assembly 250, and the collecting member 260 is arranged around the annular water retaining member 240. The collecting member 260 is provided with an annular collecting groove 261. The collecting member 260 is provided with a collecting hole, which is communicated with the annular collecting groove 261 and the sedimentation chamber 210. The annular collecting groove 261 is communicated with the liquid outlet 211. In this process, the wastewater containing flocculation bodies is precipitated in the tank 200, and the purified water is directly introduced into the annular collecting groove 261 from the collecting hole after being filtered by the inclined pipe assembly 250, and finally discharged from the liquid outlet 211.

[0045] In order to facilitate the collection of flocculation bodies in the sedimentation tank, in an embodiment, as shown in Figure 2 , the tank 200 is provided with a hopper 270, and the hopper 270 is arranged at the bottom of the sedimentation chamber 210. The bottom of the hopper 270 is provided with a sludge outlet 271.

[0046] In an embodiment, as shown in Figure 2 , the tank wall of the tank 200 is provided with an exhaust port 214 and a manhole 215. The exhaust port 214 and the manhole 215 are both communicated with the sedimentation chamber 210. The exhaust port 214 is used to discharge the gas generated in the sedimentation chamber 210, so that the pressure inside and outside the tank 200 is equal. When the wastewater treatment system 10 is damaged, the maintenance personnel can enter the inside of the tank 200 through the manhole 215 to repair or maintain.

[0047] In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features.

[0048] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly contacting the first and second features, or indirectly contacting the first and second features through an intervening medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply mean that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply mean that the first feature is horizontally lower than the second feature.

[0050] It is to be understood that when an element as a preamble is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can also be present. In the description of the present application, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms are used for the purpose of description only and are not intended to limit the present application to a particular embodiment.

[0051] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features of the above embodiments are described, however, it is to be understood that any combination of the technical features is within the scope of the present application.

[0052] The above embodiments only express several embodiments of the present application, and the description is specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A wastewater treatment system, characterized in that, include: A tank and flocculation equipment, the flocculation equipment including a cylinder and a stirring mechanism, the cylinder having a cavity, the cavity including a connected mixing zone and a flocculation zone, the stirring mechanism being inserted into the cavity, and the stirring mechanism including a rotating shaft and a first stirring blade unit and a second stirring blade unit sequentially arranged on the rotating shaft, the first stirring blade unit being located in the mixing zone and the second stirring blade unit being located in the flocculation zone, the rotating shaft rotating to drive the first stirring blade unit and the second stirring blade unit to rotate, so that the water flow velocity in the mixing zone is greater than the water flow velocity in the flocculation zone; The first stirring unit includes a first stirring blade, and the second stirring blade unit includes a second stirring blade, a third stirring blade, and a fourth stirring blade arranged sequentially at intervals along the axial direction of the rotation axis. The cylinder wall is provided with a water inlet, a coagulant inlet, a flocculant inlet, and a drain outlet from bottom to top. The water inlet and the coagulant inlet are both located in the mixing zone and are connected to the mixing zone. The flocculant inlet and the drain outlet are located at both ends of the flocculation zone and are connected to the flocculation zone. The drain outlet is located on the side of the fourth stirring blade away from the third stirring blade. A sedimentation chamber is formed inside the tank, the cylindrical body is disposed inside the sedimentation chamber, and the drain outlet is connected to the sedimentation chamber. The tank wall of the tank body is provided with a liquid drain outlet, and the height of the liquid drain outlet is lower than the height of the drain outlet along the height direction of the tank body. The second stirring paddle is arranged adjacent to the first stirring paddle. The number of blades of the first stirring paddle is greater than the number of blades of the second stirring paddle. The number of blades of the second stirring paddle is greater than the number of blades of the third stirring paddle. The number of blades of the third stirring paddle is greater than the number of blades of the fourth stirring paddle. The blades of the third stirring paddle are provided with a first perforation. The blades of the fourth stirring paddle are provided with a second perforation. The area of ​​the second perforation is greater than the area of ​​the first perforation. The wastewater treatment system also includes an inlet pipe, and the tank wall of the tank body is provided with an installation port. One end of the inlet pipe passes through the installation port and is connected to the inlet. The other end of the inlet pipe is provided with an inlet for introducing wastewater. The wastewater treatment system also includes two inlet pipes. The tank wall of the tank body is also provided with an inlet. Both inlet pipes pass through the inlet, and one inlet pipe is connected to the coagulant inlet and the other inlet pipe is connected to the flocculant inlet. The wastewater treatment system further includes an annular water baffle and an inclined tube assembly. The annular water baffle is disposed inside the sedimentation chamber and spaced out outside the cylinder. A drainage channel is formed between the cylinder and the annular water baffle. The drainage channel connects the drain outlet and the sedimentation chamber. The inclined tube assembly is sandwiched between the tank wall of the tank body and the annular water baffle and is arranged around the annular water baffle. The annular water-blocking component has a circular structure, and both the cylinder and the tank are cylindrical structures, with both the cylinder and the annular water-blocking component located at the center of the tank.

2. The wastewater treatment system according to claim 1, characterized in that, The inclined tube assembly includes multiple inclined tubes arranged in parallel to each other. The two ends of the inclined tubes are equidistant from the annular water baffle, and the inclination direction of the inclined tubes is opposite to the direction of rotation of the rotating shaft.

3. The wastewater treatment system according to claim 1, characterized in that, The wastewater treatment system further includes a water collection component, which is disposed in the sedimentation chamber and located above the inclined tube assembly. The water collection component is arranged around the annular water baffle. The water collection component has an annular water collection trough inside and a water collection hole on the water collection component. The water collection hole connects the annular water collection trough and the sedimentation chamber, and the annular water collection trough is connected to the drain outlet.

4. The wastewater treatment system according to claim 1, characterized in that, The tank is equipped with a mud hopper, which is located at the bottom of the sedimentation chamber, and the bottom of the mud hopper is equipped with a mud discharge port.

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