CN116395815B - A sewage treatment method based on desulfurization and denitrification - Google Patents

Abstract

The invention discloses a sewage treatment method based on desulfurization and denitrification, which relates to the field of sewage treatment, and comprises the following steps: S1, dosing, first putting the medicine into the sewage of the mixing equipment, and the dosage of the medicine is controlled by the flow rate of the sewage, in the mixing equipment The sewage is the sewage after desulfurization and denitrification treatment. S2. Mixing. Mix the sewage and the agent through the mixing equipment evenly, so that the agent will be hydrolyzed after being put into the sewage and produce differently charged colloids that contact with the colloids and suspended solids in the water to form fine flocs. The mixing equipment includes tanks, tanks An inflow pipe is installed on one side of the top of the tank, and an outflow pipe is installed on the bottom of one side of the tank; this sewage treatment method based on desulfurization and denitrification realizes the effect of automatically changing the dosing amount following the sewage flow, and also realizes the circulation of sewage Dosing and mixing treatment can ensure that all the sewage passing through the tank can be mixed evenly with the medicine.

Description

A sewage treatment method based on desulfurization and denitrification

technical field

The invention relates to sewage treatment technology, in particular to a sewage treatment method based on desulfurization and denitrification.

Background technique

Desulfurization and denitrification sewage refers to sewage after desulfurization and denitrification treatment. The main pollutants in it are suspended solids and heavy metal ions.

When the existing sewage is treated, flocculants are usually added to the interior, so that the fine particles and natural colloidal particles in the water can be aggregated into large flocs and then precipitated. Therefore, it is difficult to ensure the flocculation and sedimentation effect of sewage. Therefore, this scheme proposes a sewage treatment method based on desulfurization and denitrification.

Contents of the invention

The object of the present invention is to provide a sewage treatment method based on desulfurization and denitrification, so as to solve the above-mentioned deficiencies in the prior art.

In order to achieve the above object, the present invention provides the following technical solution: a method for treating sewage based on desulfurization and denitrification, comprising the following steps:

S1. Dosing: firstly put the medicament into the sewage of the mixing equipment, the dosage of the medicament is controlled by the flow rate of the sewage, and the sewage in the mixing equipment is the sewage after desulfurization and denitrification treatment;

S2. Mixing. The sewage and the agent passing through it are mixed evenly through the mixing equipment, so that the agent is hydrolyzed after being put into the sewage and produces differently charged colloids that contact the colloids and suspended matter in the water to form fine flocs;

S3, reaction, the sewage that forms fine flocs through the mixing equipment flows into the reaction equipment to make the small flocs gradually flocculate into large flocs, and the stirring intensity of the reaction equipment along the water inflow direction is getting smaller and smaller, so that the small flocs can collide with each other and prevent the large flocs produced from settling;

S4, precipitation, the sewage obtained in the S3 step flows into the sedimentation tank for mud-water separation;

S5, clean up, clean up the suspended matter in the sedimentation tank and the sludge at the bottom of the sedimentation tank.

Further, the mixing device includes a tank, an inflow pipe is installed on one side of the top of the tank, and an outflow pipe is installed on the bottom of one side of the tank;

The drug delivery mechanism includes a drug storage tank installed on the top of the tank, a turntable arranged under the drug storage tank, a plurality of drug guide grooves opened inside the turntable, and a power assembly for driving the turntable to rotate;

Inner cylinder, which is installed on the inner wall of the bottom of the tank body, a diversion groove is opened at the bottom of one side of the inner cylinder, and a sealing structure is arranged between the inner cylinder and the outflow pipe to drive the inner cylinder to rotate and The diversion groove is sealed;

A stirring mechanism, which is installed on the tank body, is used to stir the sewage inside the inner cylinder;

Auxiliary mechanism, which is installed inside the tank body, is used to accelerate the speed of liquid flow outside the inner cylinder.

Further, a drug guide tube is installed on the bottom of the drug storage tank, and an annular groove is opened on the outside of the turntable, and the annular grooves are respectively connected with a plurality of drug guide grooves, and the bottom end of the drug guide tube extends to The inside of the annular groove and fit with the annular groove.

Further, the power assembly includes a transmission shaft fixed to the axis of the turntable, an impeller fixedly sleeved outside the transmission shaft, and a ratchet mounted outside the transmission shaft, and the other end of the transmission shaft is rotatably connected to the inner wall of the tank body Above, the ratchet is connected with the inner wall of the tank to make the transmission shaft rotate in one direction, the end of the inflow tube inside the tank is located above the impeller and is matched with the impeller, and a plurality of the drug guide grooves are used to The drive shaft is distributed in a circular array at the center.

Further, the sealing structure includes a driven shaft rotatably connected to the inner wall of the tank body along the height direction, a first gear fixedly sleeved outside the driven shaft, and an outer ring gear fixedly sleeved outside the inner cylinder, so The first gear meshes with the outer ring gear.

Further, the sealing structure also includes a diversion chamber fixed on the inner wall of the bottom of the tank body near the outlet pipe and a through groove provided on the side wall of the diversion chamber, the diversion chamber is an arc-shaped structure, so The inner wall of the diversion chamber abuts against the outer wall of the inner cylinder, and the diversion chamber communicates with the outflow pipe.

Further, the stirring mechanism includes a motor installed on the top of the tank, a driving shaft fixed at the output end of the motor and a plurality of stirring blades installed outside the driving shaft, the bottom end of the driving shaft extends to the inside of the inner cylinder and It is rotatably connected with the inner cylinder, a plurality of stirring blades are located inside the inner cylinder, and the driving shaft and the end of the driven shaft extending to the outside of the tank are connected through a first transmission member.

Further, there are multiple auxiliary mechanisms, and the auxiliary mechanisms include a fixed cylinder fixed on the inner wall of the top of the tank, a feed pipe installed on one side of the bottom of the fixed cylinder, and a feed pipe installed on the other side of the bottom of the fixed cylinder. The discharge pipe, the reciprocating screw connected to the inside of the fixed cylinder by rotating along the height direction, the connecting block screwed on the outside of the reciprocating screw, the polished rod fixed on the top of the reciprocating screw and the piston installed inside the fixed cylinder, the piston is located The bottom of the connecting block is fixedly connected with the connecting block through a plurality of connecting rods, and the top ends of the polished rods extend to the outside of the tank body and are connected with the driving shaft through a second transmission member.

Further, both sides of the reciprocating screw are provided with guide rods parallel to it, the connecting block is slidably sleeved on the outside of the two guide rods, and the top end of the guide rod is fixed on the inner wall of the top of the fixing cylinder .

Further, a one-way valve is installed on the feed pipe and the discharge pipe.

Compared with the prior art, a desulfurization and denitrification-based sewage treatment method provided by the present invention has the following beneficial effects:

Through the cooperation of the various parts of the dosing mechanism, the speed at which the sewage enters the mixing equipment directly affects the rotation speed of the turntable, and the change in the speed of the turntable directly affects the dosing amount inside the tank, so the faster the sewage flows into the tank , the higher the dosing amount, the slower the sewage flows into the tank, and the lower the dosing amount, realizing the effect of automatically changing the dosing amount following the sewage flow;

Through the cooperation of the stirring mechanism and the various parts of the sealing structure, the diversion groove is set on the inner cylinder before it abuts and seals with the diversion chamber, and the sewage inside the tank enters the inner cylinder through the diversion groove. When the diversion groove on the inner cylinder When the launder rotates until it contacts and seals with the outer wall of the diversion chamber, the stirring mechanism will fully stir the sewage chemical mixture inside the inner cylinder. Mixing, and then when the diversion groove is connected with the through groove, the mixed liquid inside the inner cylinder is discharged into the diversion chamber and discharged through the outflow pipe, thereby realizing the circulation of the sewage and the mixed treatment of the sewage and ensuring that all the liquids passing through the tank are The sewage can be evenly mixed with the chemical agent, thereby ensuring the subsequent flocculation and sedimentation effect of the sewage;

Through the cooperation of the stirring mechanism and the various parts of the auxiliary mechanism, the driving shaft drives the polished rod and the reciprocating screw to rotate through the second transmission part during the rotation process, thereby driving the piston to reciprocate up and down through the connecting block and multiple connecting rods, thus circulating through the feed pipe Inhale the sewage and pharmaceutical mixture inside the tank into the fixed cylinder and discharge it through the discharge pipe, thereby accelerating the liquid flow inside the tank to accelerate the mixing of sewage and pharmaceuticals, and then before the sewage pharmaceutical mixture enters the inner cylinder for stirring Preliminary mixing is carried out first, which improves the uniformity of the final mixing of sewage and chemicals.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings that are required in the embodiments. Obviously, the accompanying drawings in the following description are only described in the present invention For some embodiments of the present invention, those skilled in the art can also obtain other drawings according to these drawings.

Figure 1 is a schematic diagram of the overall structure provided by Embodiment 1 of the present invention;

Figure 2 is a schematic diagram of the internal structure of the tank body provided by Embodiment 1 of the present invention;

3 is a schematic diagram of the internal structure of the inner cylinder provided by Embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of the overall structure provided by Embodiment 2 of the present invention;

Fig. 5 is a schematic structural diagram of the auxiliary mechanism provided by Embodiment 2 of the present invention;

Fig. 6 is a schematic diagram of the internal structure of the fixing cylinder provided by Embodiment 2 of the present invention;

Fig. 7 is a schematic structural diagram of the auxiliary mechanism provided by Embodiment 3 of the present invention;

FIG. 8 is an enlarged schematic diagram of the structure at A in FIG. 7 provided by Embodiment 3 of the present invention.

Explanation of reference signs:

1. tank body; 2. inflow pipe; 3. outflow pipe; 4. medicine storage tank; 5. turntable; Annular groove; 11, drive shaft; 12, impeller; 13, ratchet; 14, driven shaft; 15, first gear; 16, outer ring gear; 17, diversion chamber; , drive shaft; 21, stirring blade; 22, first transmission member; 23, fixed cylinder; 24, feed pipe; 25, discharge pipe; 26, reciprocating screw; 27, connecting block; 28, polished rod; 29, piston ; 30, the connecting rod; 31, the second transmission part; 32, the guide rod; 33, the one-way valve; 34, the inner ring gear; 35, the stirring rod; 36, the second gear.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

Example 1:

Please refer to Figure 1-Figure 3, a sewage treatment method based on desulfurization and denitrification, including the following steps:

S1. Dosing. First, put the medicament into the sewage of the mixing equipment. The medicament is a flocculant. The dosage of the medicament is controlled by the flow rate of the sewage. The sewage in the mixing equipment is the sewage after desulfurization and denitrification treatment.

S2. Mixing. The sewage and medicament passing through it are mixed evenly through the mixing equipment, so that the medicament is hydrolyzed after being put into the sewage and produces differently charged colloids that contact with the colloids and suspended solids in the water to form fine flocs. The mixing equipment includes a tank body 1, An inflow pipe 2 is installed on one side of the top of the tank body 1, and an outflow pipe 3 is installed on the bottom of one side of the tank body. lead to the reaction equipment;

The drug delivery mechanism includes a drug storage tank 4 installed on the top of the tank body 1, a turntable 5 arranged below the drug storage tank 4, a plurality of drug guide grooves 6 provided inside the turntable 5, and a power assembly for driving the turntable 5 to rotate , the bottom of the medicine storage tank 4 is equipped with a drug guiding tube 9, and the outer part of the turntable 5 is provided with an annular groove 10, and the annular grooves 10 communicate with a plurality of drug guiding grooves 6 respectively, and the bottom end of the drug guiding tube 9 extends to the annular groove 10 inside and fits with the annular groove 10, the power assembly includes a transmission shaft 11 fixedly connected to the axis of the turntable 5, an impeller 12 fixedly sleeved on the outside of the transmission shaft 11 and a ratchet 13 installed on the outside of the transmission shaft 11, the transmission shaft The other end of 11 is rotatably connected to the inner wall of the tank body 1, and the ratchet 13 is connected to the inner wall of the tank body 1 for one-way rotation of the transmission shaft 11, and the end of the inflow pipe 2 inside the tank body 1 is located above the impeller 12 And in cooperation with the impeller 12, a plurality of drug guide grooves 6 are distributed in a circular array centered on the transmission shaft 11. When the sewage enters the tank body 1 through the inflow pipe 2 and is discharged downward, the impeller 12 is driven to rotate, and the sewage flows faster. , the faster the rotation speed of the impeller 12 is, the faster the rotation speed of the turntable 5 is driven by the transmission shaft 11, and then when the medicine guide groove 6 communicates with the medicine guide tube 9, the medicine inside the medicine storage tank 4 enters through the medicine guide tube 9 to the inside of the drug guide tank 6, and then discharged downwards into the sewage inside the tank body 1, and then the change of the speed of the turntable 5 directly affects the dosage of the inside of the tank body 1, so that the faster the sewage flows into the inside of the tank body 1 Faster, the higher the dosing amount, on the contrary, the slower the sewage flows into the tank 1, the lower the dosing amount;

The inner cylinder 7 is installed on the inner wall of the bottom of the tank body 1. The inner cylinder 7 is rotatably connected to the inner wall of the bottom of the tank body 1. The bottom of one side of the inner cylinder 7 is provided with a diversion groove 8. The inner cylinder 7 and the outflow pipe 3 A sealing structure is provided between them to drive the inner cylinder 7 to rotate and seal the diversion groove 8. The sealing structure includes a driven shaft 14 connected to the inner wall of the tank body 1 along the height direction, fixedly sleeved on the The first gear 15 outside the moving shaft 14 and the outer ring gear 16 fixedly sleeved outside the inner tube 7, the first gear 15 meshes with the outer ring gear 16, and the sealing structure also includes a fixed connection on the tank body 1 close to the outflow pipe 3- The diversion chamber 17 on the inner wall of the side bottom and the through groove 18 provided on the inner wall of the diversion chamber 17, the diversion chamber 17 is an arc structure, the inner side wall of the diversion chamber 17 abuts against the outer wall of the inner cylinder 7, and the guide The flow chamber 17 communicates with the outflow pipe 3. When the driving shaft 20 rotates, the driven shaft 14 is driven to rotate by the first transmission member 22, and the inner cylinder 7 is driven to rotate by the meshing effect of the first gear 15 and the outer ring gear 16, and the inner cylinder 7 rotates. 7 is set on the diversion groove 8 before it abuts and seals with the diversion chamber 17, the sewage inside the tank body 1 passes through the liquid level difference inside the inner cylinder 7, and the sewage inside the tank body 1 enters through the diversion groove 8 To the inside of the inner cylinder 7, when the diversion groove 8 on the inner cylinder 7 is rotated to abut and seal with the outer wall of the diversion chamber 17, the stirring mechanism can fully stir the sewage chemical mixture inside the inner cylinder 7. 8. Before communicating with the through groove 18, the sewage chemical mixture inside the inner cylinder 7 has been fully mixed, and then when the diversion groove 8 communicates with the through groove 18, the mixed liquid inside the inner cylinder 7 is discharged into the inside of the diversion chamber 17 and passed through The outflow pipe 3 is discharged, so that the sewage can be mixed with medicine in circulation and can ensure that all the sewage passing through the tank 1 can be mixed with the medicine evenly, thereby ensuring the subsequent flocculation and sedimentation effect of the sewage;

Stirring mechanism, which is installed on the tank body 1, is used to stir the sewage inside the inner cylinder 7. The stirring mechanism includes a motor 19 installed on the top of the tank body 1, a drive shaft 20 fixedly connected to the output end of the motor 19 and a drive shaft 20 mounted on the drive A plurality of stirring blades 21 outside the shaft 20, the bottom end of the driving shaft 20 extends to the inside of the inner cylinder 7 and is rotationally connected with the inner cylinder 7, the plurality of stirring blades 21 are all located inside the inner cylinder 7, the driving shaft 20 and the driven One end of the shaft 14 extending to the outside of the tank body 1 is connected through a transmission through a first transmission member 22. The first transmission member 22 includes two transmission wheels that are fixedly sleeved on the outside of the driving shaft 20 and the driven shaft 14 and are connected in a transmission connection. The belts on the outside of the two transmission wheels drive the drive shaft 20 to rotate through the starter motor 19, and a plurality of stirring blades 21 rotate thereupon to stir the sewage drug mixture inside the inner cylinder 7. It is worth mentioning that the rotation of the stirring blades 21 The direction is opposite to the rotation direction of the inner tube 7 .

S3, reaction, the sewage that forms fine flocs through the mixing equipment flows into the reaction equipment to make the small flocs gradually flocculate into large flocs, and the stirring intensity of the reaction equipment along the direction of water inflow becomes smaller and smaller, so that the small flocs can collide with each other And prevent the large flocs produced from settling.

S4, sedimentation, the sewage obtained in step S3 flows into the sedimentation tank for mud-water separation.

S5, clean up, clean up the suspended matter in the sedimentation tank and the sludge at the bottom of the sedimentation tank.

Example 2:

Please refer to Figures 4-6, this embodiment provides a technical solution on the basis of Embodiment 1: it also includes an auxiliary mechanism installed inside the tank body 1 for accelerating the flow of liquid outside the inner cylinder 7 , the number of auxiliary mechanisms is multiple, and the auxiliary mechanism includes a fixed cylinder 23 fixed on the inner wall of the top of the tank body 1, a feed pipe 24 installed on one side of the bottom of the fixed cylinder 23, and a feed pipe installed on the other side of the bottom of the fixed cylinder 23. The discharge pipe 25, the reciprocating screw 26 connected inside the fixed cylinder 23 along the height direction, the connection block 27 screwed on the outside of the reciprocating screw 26, the polished rod 28 fixed on the top of the reciprocating screw 26 and installed inside the fixed cylinder 23 The piston 29 is located below the connecting block 27 and is fixedly connected to the connecting block 27 through a plurality of connecting rods 30. The top end of the polished rod 28 extends to the outside of the tank body 1 and is connected to the drive shaft 20 through a second transmission Part 31 is transmission connected, and the second transmission part 31 includes two transmission wheels that are respectively fixedly sleeved on the drive shaft 20 and the polished rod 28, and a belt that is transmission connected to the outside of the two transmission wheels. Both sides of the reciprocating screw 26 are provided with Parallel guide rods 32, the connecting block 27 is slidably sleeved on the outside of the two guide rods 32, the top of the guide rods 32 is fixed on the inner wall of the top of the fixed cylinder 23, and the feed pipe 24 and the discharge pipe 25 are installed There is a one-way valve 33, and the one-way valve 33 outside the feed pipe 24 is used to ensure that the sewage inside the tank body 1 can flow into the inside of the fixed cylinder 23 through the feed pipe 24, while the sewage inside the fixed cylinder 23 cannot pass through the feed pipe 24 flows out, the one-way valve 33 on the discharge pipe 25 is used to ensure that the sewage inside the fixed cylinder 23 can be discharged through the discharge pipe 25, and the external gas cannot enter the inside of the fixed cylinder 23 through the discharge pipe 25, and the driving shaft 20 is in the During the rotation process, the second transmission member 31 drives the polished rod 28 to rotate, and then drives the reciprocating screw rod 26 to rotate, thereby driving the connecting block 27 to reciprocate up and down along the outside of the guide rod 32, thereby driving the piston 29 to reciprocate up and down through a plurality of connecting rods 30 , so as to circulate through the feed pipe 24 to suck the mixed liquid of sewage and medicine inside the tank body 1 into the inside of the fixed cylinder 23 and then discharge it through the discharge pipe 25, so as to accelerate the flow rate of the liquid inside the tank body 1 to accelerate the mixing of sewage and medicine .

Example 3:

Please refer to Fig. 7 and Fig. 8, this embodiment is an alternative to Embodiment 2: the auxiliary mechanism includes an inner ring gear 34 fixedly connected to the inner wall of the tank body 1, and a plurality of gears rotatably connected to the outer wall of the inner cylinder 7 along the height direction. A stirring rod 35 and a plurality of second gears 36 fixedly sleeved on the outside of a plurality of stirring rods 35 respectively, a plurality of stirring rods 35 are distributed in an annular array with the inner cylinder 7 as the center, and a plurality of second gears 36 are all connected with the inner ring gear 34 meshing, the inner cylinder 7 drives a plurality of stirring rods 35 to make a revolution around it during the rotation process, and in this process, through the meshing effect of the second gear 36 and the inner ring gear 34, a plurality of stirring rods 35 are driven to revolve The rotation is kept during the process, so that after the sewage enters the tank body 1 and is dosed, the sewage and the medicine before entering the inner cylinder 7 can be stirred and mixed, thereby improving the mixing uniformity of the sewage and the medicine.

Working principle: When in use, the sewage enters the tank body 1 through the inflow pipe 2 and discharges downward, driving the impeller 12 to rotate. The faster the sewage flows, the faster the impeller 12 rotates, and then the drive shaft 11 drives the turntable 5 to rotate The faster the speed is, then when the medicine guide tank 6 communicates with the medicine guide tube 9, the medicine inside the medicine storage tank 4 enters the inside of the medicine guide tank 6 through the medicine guide tube 9, and then discharges downwards to the inside of the tank body 1 In the sewage, the change of the speed of the turntable 5 directly affects the dosing amount inside the tank body 1, so that the faster the sewage flows into the tank body 1, the higher the dosing amount, and the faster the sewage flows into the tank body 1. Slower, the lower the dosing amount, the sewage and chemical mixture inside the tank 1 enters the inner cylinder 7 through the diversion groove 8, and the drive shaft 20 is driven to rotate by the starting motor 19, and the multiple stirring blades 21 rotate accordingly to the inner cylinder. 7. The sewage chemical mixture inside is stirred, and the driving shaft 20 drives the driven shaft 14 to rotate through the first transmission member 22 when rotating, and the inner cylinder 7 is driven to rotate through the meshing effect of the first gear 15 and the outer ring gear 16, and the inner cylinder 7 is set on the diversion groove 8 before it abuts and seals with the diversion chamber 17, the sewage inside the tank body 1 passes through the liquid level difference inside the inner cylinder 7, and the sewage inside the tank body 1 enters through the diversion groove 8 To the inside of the inner cylinder 7, when the diversion groove 8 on the inner cylinder 7 is rotated to abut and seal with the outer wall of the diversion chamber 17, the stirring mechanism can fully stir the sewage chemical mixture inside the inner cylinder 7. 8. Before communicating with the through groove 18, the sewage chemical mixture inside the inner cylinder 7 has been fully mixed, and then when the diversion groove 8 communicates with the through groove 18, the mixed liquid inside the inner cylinder 7 is discharged into the inside of the diversion chamber 17 and passed through The outflow pipe 3 is discharged, so that the sewage can be mixed with medicine in circulation and can ensure that all the sewage passing through the tank 1 can be mixed with the medicine evenly, thereby ensuring the subsequent flocculation and sedimentation effect of the sewage;

In addition, the driving shaft 20 drives the polished rod 28 to rotate through the second transmission member 31 during the rotation process, and then drives the reciprocating screw rod 26 to rotate, thereby driving the connecting block 27 to reciprocate up and down along the outside of the guide rod 32, thereby passing through a plurality of connecting rods 30 Drive the piston 29 to reciprocate up and down, so as to circulate through the feed pipe 24 to suck the sewage and pharmaceutical mixture inside the tank 1 into the fixed cylinder 23 and then discharge it through the discharge pipe 25, thereby accelerating the liquid flow rate inside the tank 1 to Accelerate the mixing of sewage and chemicals.

Certain exemplary embodiments of the present invention have been described above only by way of illustration, and it goes without saying that those skilled in the art can use various methods without departing from the spirit and scope of the present invention. The described embodiments are modified. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims (6)

1. The sewage treatment method based on desulfurization and denitrification is characterized by comprising the following steps:

s1, dosing, namely firstly, dosing a medicament into sewage of a mixing device, wherein the dosage of the medicament is controlled by the flow rate of the sewage, and the sewage in the mixing device is the sewage after desulfurization and denitrification treatment;

s2, mixing, namely uniformly mixing the sewage passing through the interior of the mixing equipment with the medicament, so that the medicament is hydrolyzed after being put into the sewage, and heterocharge colloid is generated to contact with colloid and suspended matters in water to form fine floccules;

s3, reacting, namely enabling the sewage which forms fine floccules through the mixing equipment to flow into the reaction equipment to gradually flocculate the small floccules into large floccules, wherein the stirring strength of the reaction equipment along the water inflow direction is smaller and smaller, so that the small floccules can collide with each other and the produced large floccules are prevented from precipitating;

s4, sedimentation, wherein the sewage obtained in the step S3 flows into a sedimentation tank to carry out mud-water separation;

s5, cleaning, namely cleaning suspended matters in the sedimentation tank and sludge at the bottom of the sedimentation tank;

the mixing equipment comprises a tank body (1), wherein an inflow pipe (2) is arranged at one side of the top of the tank body (1), and an outflow pipe (3) is arranged at the bottom of one side of the tank body (1);

the medicine feeding mechanism comprises a medicine storage tank (4) arranged at the top of the tank body (1), a rotary table (5) arranged below the medicine storage tank (4), a plurality of medicine guide grooves (6) arranged in the rotary table (5) and a power assembly for driving the rotary table (5) to rotate;

the inner cylinder (7) is arranged on the inner wall of the bottom of the tank body (1), a diversion trench (8) is formed in the bottom of one side of the inner cylinder (7), and a sealing structure is arranged between the inner cylinder (7) and the outflow pipe (3) and used for driving the inner cylinder (7) to rotate and sealing the diversion trench (8);

the stirring mechanism is arranged on the tank body (1) and is used for stirring sewage in the inner cylinder (7);

the auxiliary mechanism is arranged in the tank body (1) and used for accelerating the flow speed of liquid outside the inner cylinder (7), the auxiliary mechanism is multiple in number and comprises a fixed cylinder (23) fixedly connected to the inner wall of the top of the tank body (1), a feed pipe (24) arranged on one side of the bottom of the fixed cylinder (23), a discharge pipe (25) arranged on the other side of the bottom of the fixed cylinder (23), a reciprocating screw (26) rotationally connected to the inside of the fixed cylinder (23) along the height direction of the fixed cylinder, a connecting block (27) screwed to the outside of the reciprocating screw (26), a polish rod (28) fixedly connected to the top end of the reciprocating screw (26) and a piston (29) arranged in the inside of the fixed cylinder (23), the piston (29) is positioned below the connecting block (27) and fixedly connected with the connecting block (27) through a plurality of connecting rods (30), the top end of the polish rod (28) extends to the outside of the tank body (1) and is in transmission connection with a driving shaft (20) through a second transmission piece (31), two sides of the reciprocating screw (26) are respectively provided with a guide rod (32) which is parallel to the guide rods (27) and the top of the guide rods (32) are fixedly connected to the top of the connecting block (32), and the feed pipe (24) and the discharge pipe (25) are provided with one-way valves (33).

2. The desulfurization and denitrification-based sewage treatment method according to claim 1, wherein a medicine guide pipe (9) is installed at the bottom of the medicine storage tank (4), annular grooves (10) are formed in the outer portion of the rotary disc (5), the annular grooves (10) are respectively communicated with a plurality of medicine guide grooves (6), and the bottom ends of the medicine guide pipes (9) extend to the inner portion of the annular grooves (10) and are matched with the annular grooves (10).

3. The desulfurization and denitrification-based sewage treatment method according to claim 1, wherein the power assembly comprises a transmission shaft (11) fixedly connected to the axis of the rotary disc (5), an impeller (12) fixedly sleeved outside the transmission shaft (11) and a ratchet wheel (13) installed outside the transmission shaft (11), the other end of the transmission shaft (11) is rotatably connected to the inner wall of the tank body (1), the ratchet wheel (13) is connected with the inner wall of the tank body (1) so as to enable the transmission shaft (11) to rotate unidirectionally, one end of the inflow pipe (2) positioned inside the tank body (1) is positioned above the impeller (12) and matched with the impeller (12), and the plurality of medicine guiding grooves (6) are distributed in an annular array with the transmission shaft (11) as the center.

4. The desulfurization and denitrification-based sewage treatment method according to claim 1, wherein the sealing structure comprises a driven shaft (14) rotatably connected to the inner wall of the tank body (1) along the height direction, a first gear (15) fixedly sleeved outside the driven shaft (14) and an outer gear ring (16) fixedly sleeved outside the inner cylinder (7), and the first gear (15) is meshed with the outer gear ring (16).

5. The desulfurization and denitrification-based sewage treatment method according to claim 4, wherein the sealing structure further comprises a diversion chamber (17) fixedly connected to the inner wall of the bottom of one side of the tank body (1) close to the outflow pipe (3) and a through groove (18) formed in the inner side wall of the diversion chamber (17), the diversion chamber (17) is of an arc-shaped structure, the inner side wall of the diversion chamber (17) is abutted to the outer wall of the inner cylinder (7), and the diversion chamber (17) is communicated with the outflow pipe (3).

6. The desulfurization and denitrification-based sewage treatment method according to claim 1, wherein the stirring mechanism comprises a motor (19) arranged at the top of the tank body (1), a driving shaft (20) fixedly connected to the output end of the motor (19) and a plurality of stirring blades (21) arranged outside the driving shaft (20), the bottom end of the driving shaft (20) extends to the inside of the inner cylinder (7) and is rotationally connected with the inner cylinder (7), the stirring blades (21) are all positioned in the inside of the inner cylinder (7), and one ends of the driving shaft (20) and the driven shaft (14) extending to the outside of the tank body (1) are in transmission connection through a first transmission piece (22).