Phenolic wastewater resource comprehensive utilization multistage treatment method and treatment system

Abstract

The invention relates to the technical field of sewage treatment, and discloses a phenol-containing wastewater resource comprehensive utilization multistage treatment method, which comprises the following steps: S1, intercepting and filtering phenol-containing wastewater through a grid filtering device, and enabling the filtered wastewater to enter a wastewater pool; s2, adding a polyaluminum chloride solution into the tank as a flocculating agent, dividing polyaluminum chloride into a high solution and a low solution with two concentrations, and respectively storing the high solution and the low solution into different polyaluminum chloride solution barrels; according to the method, high-concentration PAC is preferentially added, high-activity aluminum ions can be rapidly provided, negatively charged colloids in wastewater can be efficiently neutralized, the coagulation and gel breaking time is shortened, low-concentration PAC is added later, floc dispersion caused by excessive local aluminum ions can be avoided, micro floc is promoted to grow into dense floc through fine bridging, clear liquid suspended matter is achieved, and the treatment effect is good. And phenolic substances are synchronously adsorbed and removed, so that the pollutant load of a subsequent acidity adjustment and adsorption unit is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a multi-stage treatment method and system for the comprehensive utilization of phenol-containing wastewater. Background Technology

[0002] Phenolic wastewater is a common and highly challenging type of pollutant in industrial production, widely originating from industries such as coking, coal chemical, petrochemical, pharmaceutical, and dye industries. Its core pollutants, phenolic substances (such as phenol, cresol, and xylenol), are highly toxic, difficult to degrade, and prone to bioaccumulation. They not only inhibit the activity of microorganisms in water bodies, leading to the destruction of aquatic ecosystems, but may also accumulate through the food chain and harm human health. Furthermore, as important chemical raw materials, direct discharge of phenols with wastewater will result in serious resource waste.

[0003] Existing processes often use a single concentration of PAC solution for one-time addition, without considering the differentiated requirements of the two stages of coagulation reaction: "coagulation-flocculation". If the PAC concentration is too low, the negative charge of the colloidal particles cannot be quickly neutralized in the initial coagulation stage, resulting in incomplete delamination and residual phenol-colloid complexes. If the concentration is too high, the flocculation stage is prone to localized excess aluminum ions, which can cause like charge repulsion, leading to floc dispersion and breakage. In addition, excess aluminum ions will hydrolyze to form inactive aluminum hydroxide precipitate, which not only wastes the reagent but also results in excessive aluminum ion residues in the effluent. This can easily clog the pores of the subsequent adsorption resin and shorten its service life. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage treatment method and system for the comprehensive utilization of phenol-containing wastewater to solve the problems mentioned in the background art.

[0005] Technical solution

[0006] This invention provides the following technical solution: a multi-stage treatment method for the comprehensive utilization of phenol-containing wastewater, the operation steps of which are as follows:

[0007] S1: The phenol-containing wastewater is intercepted and filtered through a bar screen filter device, and the filtered wastewater enters the wastewater pool;

[0008] S2: Add polyaluminum chloride (PAC) solution to the pool as a flocculant, and divide the polyaluminum chloride (PAC) into two concentrations, high and low, and store them in different polyaluminum chloride (PAC) solution tanks.

[0009] S3: First, add a high-concentration polyaluminum chloride (PAC) solution to the wastewater tank. After a period of time, add a low-concentration polyaluminum chloride (PAC) solution to the wastewater tank through a position switching component.

[0010] S4: The pretreated wastewater enters the acidity adjustment tank. Sulfuric acid or hydrochloric acid solution is added through an automatic dosing system to adjust the pH value of the wastewater according to the initial pH value of the wastewater.

[0011] S5: Macroporous adsorption resin is used, and a three-stage series adsorption tower is set up for graded adsorption.

[0012] A multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater is disclosed. This system comprises a wastewater tank and a motor. A fixed platform is mounted on the wastewater tank, and a rotating platform is mounted on the fixed platform. A position-switching component connects the fixed platform and the rotating platform. A low-concentration PAC solution tank and a high-concentration PAC solution tank are mounted on the rotating platform. Both the low-concentration and high-concentration PAC solution tanks are equipped with feed pipes, and spray heads are installed at the ends of the feed pipes. When the phenol-containing wastewater enters the wastewater tank, the high-concentration PAC solution tank first sprays its PAC solution into the wastewater tank through the feed pipes and spray heads. After spraying for a period of time, the position-switching component moves the low-concentration PAC solution tank above the wastewater tank, spraying the low-concentration PAC solution to accelerate the flocculation of the wastewater in the wastewater tank.

[0013] Preferably, the position switching component includes a push column and a connecting block, an inclined block is provided on the fixed platform, a first gear is provided on the motor, and the push column and the inclined block are in sliding contact.

[0014] Preferably, the high-concentration PAC solution tank is equipped with a rotating shaft, and the rotating shaft is equipped with a stirring rod and a second gear, and the stirring rod stirs the PAC solution in the PAC solution tank.

[0015] Preferably, the second gear is located outside the high-concentration PAC solution tank, and the first gear and the second gear are meshed together.

[0016] Preferably, the feeding pipe is provided with a telescopic pipe and a blocking column, the feeding pipe has a feeding through hole, the end of the telescopic pipe is engaged with the spray head, the spray head is provided with a dispersing plate, and the spray head has spray holes at equal intervals inside.

[0017] Preferably, the rotating table has an adjustment cavity, and a feeding assembly is provided in the adjustment cavity. A blocking column extends into the adjustment cavity. The feeding assembly includes a contact rod and a sliding plate. The contact rod is L-shaped. A first pushing plate is provided between the contact rod and the sliding plate. An elastic element is provided on the other side of the sliding plate.

[0018] Preferably, the sliding plate is further provided with a second push plate, and the blocking column is provided with a second inclined surface that matches the first push plate, and a first inclined surface that matches the second push plate.

[0019] Preferably, a fixing rod is provided on the outer ring side of the fixing platform, and a first fixing ring plate and a second fixing ring plate are provided on the fixing rod, wherein the first fixing ring plate is in sliding contact with the contact rod.

[0020] Preferably, the second fixing ring plate is provided with a connecting ring block, which is engaged with the spray head.

[0021] Beneficial effects

[0022] Compared with existing technologies, this invention provides a multi-stage treatment method and system for the comprehensive utilization of phenol-containing wastewater, which has the following beneficial effects:

[0023] 1. In this invention, by preferentially adding high-concentration PAC, highly active aluminum ions can be quickly provided to efficiently neutralize negatively charged colloids in wastewater, shortening the coagulation and depolymerization time. Adding low-concentration PAC afterwards can avoid floc dispersion caused by excessive local aluminum ions. Through fine bridging, micro-flocs are promoted to grow into dense flocs, achieving clear liquid suspension and simultaneously adsorbing and removing phenolic substances, significantly reducing the pollutant load of subsequent acidity adjustment and adsorption units.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0025] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the rotating platform of the present invention on the fixed platform;

[0030] Figure 4 This is a working diagram of the rotating platform of the present invention;

[0031] Figure 5 This is a schematic diagram of the high-concentration PAC solution tank of the present invention;

[0032] Figure 6This is a cross-sectional view of the feed pipe of the present invention connected in a high-concentration PAC solution tank;

[0033] Figure 7 This is a schematic diagram of the adjustment cavity of the present invention;

[0034] Figure 8 This is a perspective view of the material feeding component of the present invention;

[0035] Figure 9 This is a second perspective of the material feeding component of the present invention;

[0036] Figure 10 This is a schematic diagram of the spraying component of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] In the diagram: 1. Wastewater tank; 2. Motor; 3. Fixed platform; 4. Rotating platform; 5. Low-concentration PAC solution tank; 6. High-concentration PAC solution tank; 7. First fixed ring plate; 8. Second fixed ring plate; 9. Contact rod; 10. Feed pipe; 11. First gear; 12. Second gear; 13. Push column; 14. Connecting block; 15. Inclined block; 16. Rotating shaft column; 17. Stirring rod; 18. Feeding through hole; 19. Fixed rod; 20. Telescopic pipe; 21. Spray head; 22. Blocking column; 23. Connecting ring block; 24. Elastic element; 25. First push plate; 26. Sliding plate; 27. Second push plate; 28. First inclined plane; 29. ​​Second inclined plane; 30. Dispersion plate; 31. Spray hole. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example:

[0041] Please see Figure 1 This invention provides a technical solution: a multi-stage treatment method for the comprehensive utilization of phenol-containing wastewater, the operation steps of which are as follows:

[0042] S1: The phenol-containing wastewater is intercepted and filtered through a bar screen filter device, and the filtered wastewater enters the wastewater pool;

[0043] S2: Add polyaluminum chloride solution to the pool as a flocculant, and divide the polyaluminum chloride (PAC) into two concentrations, high and low, and store them in different polyaluminum chloride (PAC) solution tanks.

[0044] S3: First, add a high-concentration polyaluminum chloride (PAC) solution to the wastewater tank. After a period of time, add a low-concentration polyaluminum chloride (PAC) solution to the wastewater tank through a position switching component.

[0045] S4: The pretreated wastewater enters the acidity adjustment tank. Sulfuric acid or hydrochloric acid solution is added through an automatic dosing system to adjust the pH value of the wastewater according to the initial pH value of the wastewater.

[0046] S5: Macroporous adsorption resin is used, and a three-stage series adsorption tower is set up for graded adsorption.

[0047] Please see Figures 2-10 This invention provides a technical solution: a multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater, which is used in a multi-stage treatment method for the comprehensive utilization of phenol-containing wastewater. The system includes a wastewater tank 1 and a motor 2. The motor 2 is located on the side of the wastewater tank 1. A fixed platform 3 is fixedly installed on the wastewater tank 1, and a rotating platform 4 is movably installed above the fixed platform 3. A position-changing component is provided between the fixed platform 3 and the rotating platform 4. A low-concentration PAC solution tank 5 and a high-concentration PAC solution tank 6 are respectively fixedly installed on the rotating platform 4. The bottom of each high-concentration PAC solution tank 6 is fixedly connected to a discharge pipe 10, and a spray head 21 is fixedly installed at the end of the discharge pipe 10. When the phenol-containing wastewater enters the wastewater tank 1, the high-concentration PAC solution tank 6 first sprays the PAC solution in the tank into the wastewater tank 1 through the discharge pipe 10 and the spray head 21. After spraying for a period of time, the low-concentration PAC solution tank 5 is moved to the top of the wastewater tank 1 by the position switching component, and the low-concentration PAC solution is sprayed. This achieves the sequential spraying of two PAC solutions into the phenol-containing wastewater, thereby accelerating the flocculation of the wastewater in the wastewater tank 1.

[0048] In this embodiment, the position switching component includes a push column 13 and a connecting block 14. An inclined block 15 is fixedly installed on the fixed platform 3, and a first gear 11 is fixedly installed on the output shaft of the motor 2. The push column 13 is snapped onto the output shaft of the motor 2, that is, a snap-fit ​​groove is opened on the output shaft of the motor 2, and the snap-fit ​​groove is vertical. In this way, the push column 13 can move up and down on the output shaft of the motor 2. At the same time, a compression spring is provided above the connection between the push column 13 and the output shaft of the motor 2. When the push column 13 contacts and separates from the inclined block 15, under the action of the compression spring, the push column 13 will quickly return to its original position and return to the horizontal plane parallel to the connecting block 14. The push column 13 is located below the first gear 11, and the push column 13 slides in contact with the inclined block 15.

[0049] A circular cavity is provided above the fixed platform 3. An annular rotating seat is fixedly installed at the bottom of the rotating platform 4. The annular rotating seat is movably installed in the circular cavity. Two connecting blocks 14 are symmetrically fixedly installed on the inner ring side of the annular rotating seat. The pushing column 13 and the inclined block 15 are also located on the inner ring side of the annular rotating seat. There is only one inclined block 15. The contact surface between the pushing column 13 and the inclined block 15 is formed as a third inclined surface. The pushing column 13 also contacts the connecting block 14. Before the pushing column 13 contacts the inclined block 15, the pushing column 13 will always be in contact with one of the connecting blocks 14 when rotating, and will drive the connecting block 14 to rotate together, that is, drive the rotating platform 4 to rotate. When the pushing column 13 drives the connecting block 14 to rotate and contacts the inclined block 15, the pushing column 13 will rotate. Under the action of the third inclined plane of the inclined block 15, the moving column 13 will separate from the connecting block 14. After the pushing column 13 separates from the inclined block 15, it will not contact the connecting block 14 that has just separated. Instead, after the pushing column 13 rotates half a turn, it will re-contact the other connecting block 14 and drive the other connecting block 14 to rotate again. This process repeats, meaning that when the pushing column 13 rotates one turn, it can drive the rotating platform 4 to rotate half a turn through the connecting block 14. After rotating half a turn, the rotating platform 4 will not rotate for half a turn, which facilitates the discharge of PAC solution from the low-concentration PAC solution tank 5 or the high-concentration PAC solution tank 6 into the wastewater pool 1. In other words, the low-concentration PAC solution tank 5 and the high-concentration PAC solution tank 6 above the rotating platform 4 will switch positions and be swapped.

[0050] The low-concentration PAC solution tank 5 and the high-concentration PAC solution tank 6 are identical in shape and size, and their internal configurations are also the same.

[0051] In this embodiment, a rotating shaft 16 is slidably installed inside both the low-concentration PAC solution tank 5 and the high-concentration PAC solution tank 6. The rotating shaft 16 penetrates the inner wall of the bottom end of the PAC solution tank, and a sealing gasket is provided at the contact part between the rotating shaft 16 and the bottom wall of the PAC solution tank. A stirring rod 17 is movably installed on the rotating shaft 16, and a second gear 12 is fixedly installed on it. The stirring rod 17 is located inside the PAC solution tank, while the second gear 12 is located on the bottom side of the PAC solution tank. The stirring rod 17 stirs the PAC solution in the PAC solution tank.

[0052] The rotating shaft 16 is located inside the PAC solution tank. A sliding groove is provided on the surface of the rotating shaft 16. When the rotating shaft 16 rotates, the stirring rod 17 can slide up and down in the PAC solution tank through this sliding groove to stir the PAC solution in the PAC solution tank and prevent the PAC solution from settling in the tank and clogging the discharge hole 18.

[0053] In this embodiment, the second gear 12 is located outside the high-concentration PAC solution tank 6, and the first gear 11 and the second gear 12 are meshed together. When the first gear 11 rotates, it can drive the rotating shaft 16 to rotate through the second gear 12. In this way, when the two concentration PAC solution tanks are switched, the rotating shaft 16 can always drive the solution in the tank to be in a flowing state through the stirring rod 17.

[0054] In this embodiment, a telescopic tube 20 and a blocking column 22 are movably installed in the feed pipe 10. A feed through-hole 18 is provided in the feed pipe 10, located inside the PAC solution tank. The blocking column 22 in the feed pipe 10 can block the feed through-hole 18, and can open it when needed, allowing the PAC solution to be released from the tank. The other end of the blocking column 22 penetrates through the inner wall of the feed pipe 10 and extends to the outside. The end of the telescopic tube 20 is engaged with a spray head 21, and a dispersion plate 30 is movably installed in the spray head 21. Furthermore, spray holes 31 are evenly spaced inside the spray head 21, and a spray motor is fixedly installed on the outside of the spray head 21. The spray motor is fixedly connected to the dispersion plate 30. When the solution from the PAC solution tank enters the spray head 21 through the feed pipe 10 and the telescopic pipe 20, the dispersion plate 30 will evenly spray the PAC solution into the wastewater tank 1 through the spray holes 31 by the operation of the spray motor. Firstly, the spray range of the PAC solution is wide, which can increase the contact area between the PAC solution and the phenol-containing wastewater in the wastewater tank 1 and accelerate the flocculation of the phenol-containing wastewater in the wastewater tank 1.

[0055] The spray head 21 has a built-in dispersion plate 30 and equally spaced spray holes 31. With the help of the spray motor, it can evenly disperse the PAC solution to the entire wastewater pool, increasing the contact area and avoiding the problems of local PAC enrichment and local unreacted areas.

[0056] In this embodiment, the rotating table 4 has an adjustment cavity, and a feeding assembly is provided in the adjustment cavity. The end of the blocking column 22 extends into the adjustment cavity. The feeding assembly includes a contact rod 9 and a sliding plate 26. The contact rod 9 is L-shaped, with one end passing through the inner wall of the adjustment cavity and extending to the outside of the rotating table 4. The sliding plate 26 is located inside the adjustment cavity and is movably installed inside the adjustment cavity. A first push plate 25 is fixedly installed between the contact rod 9 and the sliding plate 26. An elastic element 24 is fixedly installed on the other side of the sliding plate 26. The elastic element 24 is a return spring, and the other end of the elastic element 24 is fixedly connected to the inner wall of the adjustment cavity. The elastic element 24 does not contact other components.

[0057] In this embodiment, a second push plate 27 is also fixedly installed on the sliding plate 26. The blocking column 22 has a second inclined surface 29 that matches the first push plate 25 and a first inclined surface 28 that matches the second push plate 27. When the contact rod 9 is squeezed by the outside, it will move into the adjustment cavity. At this time, the contact rod 9 will drive the first push plate 25 to move deeper into the adjustment cavity and squeeze the elastic member 24. At the same time, the first push plate 25 will drive the blocking column 22 to move upward through the second inclined surface 29. The upward movement of the blocking column 22 will drive the discharge through hole 18, so that the PAC solution flows out of the tank and enters the spray head 21 through the discharge pipe 10 and the telescopic pipe 20 and is sprayed into the phenol-containing wastewater in the wastewater tank 1.

[0058] The second push plate 27 is fixedly installed on the sliding plate 26 on the side close to the first push plate 25. The first push plate 25 and the second push plate 27 are not located on the same straight plane. When the contact rod 9 moves into the adjustment cavity, the contact surface between the first inclined surface 28 on the blocking column 22 and the second push plate 27 becomes smaller. When the contact rod 9 loses the outer pressure, under the elastic force recovery of the elastic element 24, the sliding plate 26 will slide and drive the contact rod 9 out of the adjustment cavity through the first push plate 25. During this period, the second push plate 27 will drive the blocking column 22 to move down through the first inclined surface 28, and cause the blocking column 22 to re-block the discharge through hole 18, thereby preventing the PAC solution from flowing out.

[0059] In this embodiment, fixing rods 19 are fixedly installed at equal intervals on the outer ring side of the fixing platform 3. A first fixing ring plate 7 and a second fixing ring plate 8 are fixedly installed on the fixing rods 19 respectively. The first fixing ring plate 7 is located inside the second fixing ring plate 8, but the first fixing ring plate 7 and the second fixing ring plate 8 do not contact each other. The inner ring side of the first fixing ring plate 7 slides in contact with the contact rod 9. The first fixing ring plate 7 and the second fixing ring plate 8 are not completely circular ring plates. Recessed parts and protruding parts are respectively provided on the adjacent sides of the first fixing ring plate 7 and the second fixing ring plate 8.

[0060] In this embodiment, a connecting ring block 23 is slidably installed in the second fixed ring plate 8. The connecting ring block 23 is engaged with the spray head 21. The connecting ring block 23 can move in the second fixed ring plate 8. When it moves, it can drive the spray head 21 to move together. When the connecting ring block 23 moves to the protrusion of the second fixed ring plate 8, the telescopic tube 20 can be extended, driving the spray head 21 closer to the middle of the wastewater tank 1, so that the PAC solution can be sprayed over a large range in the wastewater tank 1.

[0061] A reducer is installed on motor 2 to reduce the rotation speed of the first gear 11 and the push column 13, thereby reducing the switching speed between the low-concentration PAC solution tank 5 and the high-concentration PAC solution tank 6 and increasing the time for PAC solutions of different concentrations to enter the phenol-containing wastewater in wastewater tank 1.

[0062] By using a position-switching component, high-concentration PAC is preferentially added and low-concentration PAC is subsequently added. High-concentration PAC can quickly provide highly active aluminum ions to efficiently neutralize negatively charged suspended solids and colloids in phenol-containing wastewater, reducing coagulation and depolymerization time. When low-concentration PAC is added slowly, it can avoid floc dispersion caused by excessive aluminum ions in some areas. Through fine bridging, it promotes the growth of micro-flocs into dense flocs, increases the settling speed, and ultimately reduces the concentration of suspended solids in the clarified liquid in wastewater tank 1. At the same time, it reduces the phenol residue adsorbed by the suspended solids in the clarified liquid, improves the phenol removal rate, and ensures the quality of influent for subsequent resource utilization.

[0063] The working principle of this embodiment is as follows: When in use, phenol-containing wastewater is introduced into the wastewater tank 1, the motor 2 is started and works, the motor 2 will drive the first gear 11 and the push column 13 to rotate simultaneously. When the first gear 11 rotates, it will drive the rotating shaft column 16 to rotate through the second gear 12. When the rotating shaft column 16 rotates, it will drive the stirring rod 17 to stir the PAC solution in the low concentration PAC solution tank 5 and the high concentration PAC solution tank 6, to prevent the PAC solution in the two tanks from settling, and at the same time ensure that the PAC in the tanks dissolves, avoids clumping and waste, and avoids concentration stratification in the tanks.

[0064] Simultaneously, when the push column 13 rotates, it first contacts the first connecting block 14, and through the first connecting block 14, it drives the rotating platform 4 to rotate, thereby causing the high-concentration PAC solution tank 6 and the low-concentration PAC solution tank 5 to exchange positions. This allows different concentrations of PAC solution to be added to the phenol-containing wastewater tank 1. Adding the high-concentration PAC solution first allows the phenol-containing wastewater to quickly complete coagulation and depolymerization, while adding the low-concentration PAC solution later promotes floc compaction. Adding different concentrations of PAC solution sequentially reduces ineffective consumption and lowers the total amount of PAC solution added. After the two PAC solution tanks of different concentrations have exchanged positions, the push column 13 contacts the inclined block 15, and with the cooperation of the third inclined surface, the push column 13 separates from the first connecting block 14, meaning the rotating platform 4 stops rotating. After the push column 13 continues to rotate half a turn, it contacts the other connecting block 14 again, driving the rotating platform 4 to rotate again, causing the low-concentration PAC solution tank 5 and the high-concentration PAC solution tank 6 to exchange positions again, and so on.

[0065] When the two PAC solutions are switched, that is, when the PAC solution tank above wastewater tank 1 moves to the switched position, its corresponding contact rod 9 will move on the first fixed ring plate 7. Engaged by the recessed part of the first fixed ring plate 7, the contact rod 9 will move into the adjustment cavity. The contact rod 9 will then drive the sliding plate 26 deeper into the adjustment cavity via the first push plate 25. With the cooperation of the second inclined surface 29, the blocking column 22 will move upwards, opening the discharge through hole 18, allowing the PAC solution in the PAC solution tank to flow out. The solution will enter the discharge pipe 10 through the discharge through hole 18 and then enter the spray head 21 through the telescopic pipe 20. With the cooperation of the dispersion plate 30 and the spray hole 31, the PAC solution entering the spray head 21 will be dispersed and sprayed onto the surface of the phenol-containing wastewater in the wastewater tank 1. At the same time, the connecting ring block 23 located in the second fixed ring plate 8 will also move together with the PAC solution tank. At the protrusion of the second fixed ring plate 8, the connecting ring block 23 will drive the spray head 21 to move towards the center of the wastewater tank 1, further increasing the spray range of the PAC solution.

[0066] When the two PAC solution tanks need to be repositioned, the contact rod 9 of the PAC solution tank above the wastewater tank 1 will lose the restriction of the first fixed ring plate 7. Under the action of the elastic element 24, the sliding plate 26 will drive the contact rod 9 to move outward of the adjustment cavity through the first push plate 25. At the same time, the sliding plate 26 will also drive the second push plate 27 to move together. With the cooperation of the first inclined surface 28 on the blocking column 22, the blocking column 22 will re-block the discharge hole to prevent solution leakage when the PAC solution tank is repositioned.

[0067] As the rotating platform 4 rotates rhythmically, PAC solutions of high and low concentrations will be added to the phenol-containing wastewater in batches, layer by layer, to further accelerate the flocculation of the phenol-containing wastewater and improve its flocculation efficiency.

[0068] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-stage treatment method for the comprehensive utilization of phenol-containing wastewater, characterized in that: The operating steps are as follows: S1: The phenol-containing wastewater is intercepted and filtered through a bar screen filter device, and the filtered wastewater enters the wastewater pool; S2: Add polyaluminum chloride (PAC) solution to the pool as a flocculant, and divide the polyaluminum chloride (PAC) into two concentrations, high and low, and store them in different polyaluminum chloride (PAC) solution tanks. S3: First, add a high-concentration polyaluminum chloride (PAC) solution to the wastewater tank. After a period of time, add a low-concentration polyaluminum chloride (PAC) solution to the wastewater tank through a position switching component. S4: The pretreated wastewater enters the acidity adjustment tank. Sulfuric acid or hydrochloric acid solution is added through an automatic dosing system to adjust the pH value of the wastewater according to the initial pH value of the wastewater. S5: Macroporous adsorption resin is used, and a three-stage series adsorption tower is set up for graded adsorption.

2. A multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater, used in the multi-stage treatment method for the comprehensive utilization of phenol-containing wastewater as described in claim 1, comprising a wastewater tank (1) and a motor (2), characterized in that: A fixed platform (3) is provided on the wastewater pool (1), and a rotating platform (4) is provided on the fixed platform (3). A position switching component is provided between the fixed platform (3) and the rotating platform (4). A low-concentration PAC solution tank (5) and a high-concentration PAC solution tank (6) are provided on the rotating platform (4). A feed pipe (10) is provided in both the low-concentration PAC solution tank (5) and the high-concentration PAC solution tank (6). A spray head (21) is provided at the end of the feed pipe (10). When the phenol-containing wastewater enters the wastewater pool (1), the high-concentration PAC solution tank (6) first sprays the PAC solution in the tank into the wastewater pool (1) through the feed pipe (10) and the spray head (21). After spraying for a period of time, the low-concentration PAC solution tank (5) is switched to the top of the wastewater pool (1) by the position switching component to spray the low-concentration PAC solution and accelerate the flocculation of the phenol-containing wastewater in the wastewater pool (1).

3. The multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater according to claim 2, characterized in that: The position switching component includes a push column (13) and a connecting block (14). An inclined block (15) is provided on the fixed platform (3). A first gear (11) is provided on the motor (2). The push column (13) and the inclined block (15) are in sliding contact.

4. The multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater according to claim 3, characterized in that: The high-concentration PAC solution tank (6) is equipped with a rotating shaft (16), and a stirring rod (17) and a second gear (12) are provided on the rotating shaft (16). The stirring rod (17) stirs the PAC solution in the PAC solution tank.

5. A multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater according to claim 4, characterized in that: The second gear (12) is located outside the high-concentration PAC solution tank (6), and the first gear (11) and the second gear (12) are meshed together.

6. A multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater according to claim 2, characterized in that: The feeding pipe (10) is provided with a telescopic pipe (20) and a blocking column (22). The feeding pipe (10) is provided with a feeding through hole (18). The end of the telescopic pipe (20) is connected to the spray head (21). The spray head (21) is provided with a dispersing plate (30), and spray holes (31) are provided at equal intervals inside the spray head (21).

7. A multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater according to claim 6, characterized in that: The rotating table (4) has an adjustment cavity, and a feeding assembly is provided in the adjustment cavity. A blocking column (22) extends into the adjustment cavity. The feeding assembly includes a contact rod (9) and a sliding plate (26). The contact rod (9) is L-shaped. A first push plate (25) is provided between the contact rod (9) and the sliding plate (26). An elastic element (24) is provided on the other side of the sliding plate (26).

8. A multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater according to claim 7, characterized in that: The sliding plate (26) is also provided with a second push plate (27), and the blocking column (22) is provided with a second inclined surface (29) that matches the first push plate (25) and a first inclined surface (28) that matches the second push plate (27).

9. A multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater according to claim 7, characterized in that: A fixing rod (19) is provided on the outer ring side of the fixing platform (3). A first fixing ring plate (7) and a second fixing ring plate (8) are provided on the fixing rod (19). The first fixing ring plate (7) and the contact rod (9) are in sliding contact.

10. A multi-stage treatment system for the comprehensive utilization of phenol-containing wastewater according to claim 9, characterized in that: The second fixing ring plate (8) is provided with a connecting ring block (23), which is engaged with the spray head (21).

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