A terminal treatment device and treatment method for pharmaceutical wastewater

Abstract

The invention relates to the technical field of effluent treatment of medical and chemical wastewater, and proposes a terminal treatment device and a treatment method for medical wastewater, comprising a device body, a water inlet pipeline, a discharge pipeline and a circulation pipeline, and a circulation pump. The circulation pipeline is connected to the water inlet pipeline, and a wastewater conveying pipeline is also provided at the connection between the water inlet pipeline and the circulation pipeline, and the wastewater conveying pipeline is used to convey the medical wastewater to be treated. The device body comprises a box body with a reaction chamber, and the reaction chamber is divided into a spraying area, a pre-oxidation area, a post-oxidation area and a precipitation area from top to bottom. The spraying area is provided with a spraying assembly and a plurality of atomizing nozzles connected to the water inlet pipeline, and the spraying assembly drives the atomizing nozzle to swing back and forth. The discharge pipeline and the circulation pipeline are respectively connected to the precipitation area. The wastewater conveying pipeline is provided with a first flow control valve, the circulation pipeline is provided with a second flow control valve, and the discharge pipeline is provided with a third flow control valve. The invention improves the decomposition effect of organic matter and ensures that the COD content in sewage is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical wastewater effluent treatment, and in particular to a terminal treatment device for medical wastewater. The present invention also provides a treatment method for medical wastewater using the terminal treatment device. Background Art

[0002] Pharmaceutical wastewater, especially pharmaceutical intermediate wastewater, is characterized by high concentration, complex composition, and contains a large number of toxic and hazardous substances. The wastewater contains esters, aldehydes, and some polycyclic and polychain substances. The treatment of these wastewaters requires the use of a variety of technical means to ensure that the discharge standards are met.

[0003] Generally speaking, after the existing pharmaceutical wastewater is treated by sedimentation and biochemical treatment, the water still contains COD content of about 300 mg / L or more. The residual COD in the water is usually a substance that is difficult to biodegrade. Currently, ozone oxidation, Fenton method, activated carbon adsorption method, electrochemical method and other methods are commonly used to remove substances that are difficult to biodegrade.

[0004] Among them, the ozone oxidation method is difficult to degrade the difficult-to-degrade polycyclic and multi-chain substances due to the redox potential of ozone. Although the Fenton method has strong oxidizing properties, its oxidation efficiency is reduced for low-concentration COD wastewater, and during the operation of the equipment, the addition of iron salts will produce hazardous waste iron sludge, increasing the secondary treatment cost and environmental pollution.

[0005] For the activated carbon adsorption method, the difficult-to-degrade substances such as COD are adsorbed and separated by adsorption, but this method is difficult to regenerate, and the cost of secondary replacement of activated carbon is very high, which increases the operating cost. As for the traditional plate electrochemical method, the electrodes are filled with electrolyte solution, and the chemical reaction on the electrode surface is carried out by the passage of current. During implementation, if the electrode spacing is set too large, the distance between the organic matter and the electrode increases, resulting in low oxidation efficiency and high electrode energy effect. In the process of electrochemical wastewater treatment, various phenomena such as oxidation-reduction, coagulation, flotation, sterilization and adsorption will occur. If the distance between the electrode plates is set too small, the particulate matter in the sewage will easily adhere to the electrode plates, affecting the electrode plates.

[0006] The sewage is not fully catalyzed. In severe cases, scaling may block the electrode plates, leading to severe oxidation of the electrodes. Multiple cleanings are required, which not only increases the workload of manual cleaning, but also increases the maintenance costs of the pyrolysis equipment. Summary of the invention

[0007] In view of this, the present invention aims to propose a terminal treatment device for pharmaceutical wastewater, so as to improve the decomposition effect of organic matter by electrocatalytic oxidation and ensure that the COD content in the sewage is greatly reduced.

[0008] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0009] A terminal treatment device for pharmaceutical wastewater comprises a device body, a water inlet pipeline connected to the top of the device body, a discharge pipeline and a circulation pipeline arranged at the bottom of the device body, and a circulation pump arranged on the circulation pipeline;

[0010] The circulation pipeline is in communication with the water inlet pipeline, and a wastewater delivery pipeline is also provided at the connection between the water inlet pipeline and the circulation pipeline, and the wastewater delivery pipeline is used to deliver the medical wastewater to be treated;

[0011] The device body comprises a box having a reaction chamber, and the reaction chamber is divided from top to bottom into a spraying zone, a pre-oxidation zone, a post-oxidation zone and a precipitation zone;

[0012] The spraying area is provided with a spraying assembly connected to the box body, and a plurality of atomizing nozzles connected to the water inlet pipeline, and the spraying assembly drives the atomizing nozzles to swing back and forth;

[0013] The front oxidation zone is provided with a front electrolysis assembly longitudinally arranged in the box, and the rear oxidation zone is provided with a rear electrolysis assembly transversely arranged in the box;

[0014] The cross-sectional area of ​​the post-oxidation zone is larger than that of the pre-oxidation zone, the precipitation zone is formed at the bottom of the box, and the discharge pipeline and the circulation pipeline are respectively connected to the precipitation zone;

[0015] The wastewater delivery pipeline is provided with a first flow control valve, the circulation pipeline is provided with a second flow control valve, and the discharge pipeline is provided with a third flow control valve.

[0016] Furthermore, the pre-electrolysis assembly includes a plurality of first anode plates and first cathode plates arranged alternately at intervals, and the first anode plates and the first cathode plates are electrically connected to an external power source respectively;

[0017] The diameter of the droplets sprayed by the atomizing nozzle is 20-30 μm;

[0018] The distance between the first anode plate and the first cathode plate is in the range of 2 mm to 4 mm.

[0019] Furthermore, the height of the first anode plate and the first cathode plate ranges from 850 to 1000 mm.

[0020] Furthermore, the post-oxidation zone includes a second anode plate and a second cathode plate spaced apart from each other, and the second anode plate and the second cathode plate are electrically connected to an external power source respectively;

[0021] The cross section of the second anode plate is larger than the cross section of the front electrolysis assembly;

[0022] The second anode plate is provided with a plurality of flow holes, and the medical wastewater flows to the second cathode plate through the flow holes.

[0023] Furthermore, a first driving unit is provided on the outer side of the bottom of the box body, a power output shaft of the first driving unit is keyed to the second anode plate, the power output shaft of the first driving unit passes through the second cathode plate, and a first bearing is provided between the second cathode plate and the power output shaft of the first driving unit.

[0024] Furthermore, mounting plates are connected to both sides of the second cathode plate, the mounting plates are fixed in the box, a scraper is connected to one mounting plate, the length direction of the scraper extends radially along the second anode plate, and the scraper is arranged above the second anode plate.

[0025] Further, the spray assembly includes a second driving part, a transmission assembly provided at a power output end of the second driving part, a connecting rod connected to one end of the transmission assembly, and a swing arm assembly provided on the connecting rod;

[0026] Both ends of the swing arm assembly are hinged on the box body;

[0027] A plurality of atomizing nozzles are arranged at intervals along the length direction of the swing rod;

[0028] The swing arm assembly is provided in plurality along the arrangement direction of the first anode plates and the first cathode plates;

[0029] The second driving part drives the swing arm assembly to swing back and forth along the extending direction of the first anode plate.

[0030] Furthermore, the first anode plate and / or the second anode plate adopts a titanium oxide electrode;

[0031] The first cathode plate and / or the second cathode plate are made of stainless steel electrodes.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] The terminal treatment device for pharmaceutical wastewater of the present invention converts wastewater into droplet form by using an atomizing nozzle. The droplets formed by the wastewater undergo two-stage electrolytic oxidation in the front electrolytic component and the rear electrolytic component. Under the action of the electric field, high-potential hydroxyl radicals such as OH- are generated in the anode region, which can degrade organic pollutants in the water body and oxidize organic matter into CO2 and H2O. At the same time, since pharmaceutical wastewater contains a large amount of inorganic salt byproducts, sodium hypochlorite is generated in the electrolytic process through the combined oxidation of the cathode and anode. Sodium hypochlorite, as an oxidant, can degrade organic pollutants in the water body again.

[0034] In addition, the pre-electrolysis assembly is arranged longitudinally, and the wastewater is sprayed in the form of droplets. The wastewater flows through the pre-electrolysis assembly instead of being immersed as in the prior art, which reduces energy consumption and loss of the anode plate. In addition, the wastewater produces oxygen, hydrogen and carbon dioxide during the electrocatalytic oxidation process. Oxygen can directly participate in the oxidation reaction at the anode to help degrade organic matter. Hydrogen and carbon dioxide react and float on the side walls of the plate. Since there is no electrolyte constraint between the plates, the gas dispersion is higher, thereby forming resistance in the process of the droplets falling. When the resistance is equal to the gravity of the droplets, the droplets move at a uniform speed, thereby adapting to the constant current mode of the power supply of the pre-electrolysis assembly, thereby protecting the electrode plate and extending its service life.

[0035] In addition, a horizontally arranged post-electrolysis assembly is arranged below the front electrolysis assembly to electrolyze and oxidize the sewage that has not been completely electrolytically oxidized in the front electrolysis assembly to further remove the COD in the sewage, and finally precipitate the particles or flocculants in the sedimentation area. In addition, the sewage that has been electrocatalytically oxidized once is sprayed, oxidized, and precipitated again through the transportation of the circulation pump to reduce the COD content in the difficult-to-degrade sewage to less than 50 mg / L for discharge. The first flow control valve, the second flow control valve, and the third flow control valve are also arranged to coordinate the water inlet of the wastewater delivery pipeline, dilute the treated water in the circulation pipeline with the new sewage, and reduce the water inlet pipeline.

[0036] Another object of the present invention is to provide a method for treating pharmaceutical wastewater, the method comprising the following steps:

[0037] Step 1, transporting the pharmaceutical wastewater to the water inlet pipeline through the wastewater transport pipeline, and the atomizing nozzle sprays the pharmaceutical wastewater in a mist form on the pre-electrolysis component for pre-electrolysis oxidation;

[0038] Step 2, adjusting the rotation speed of the second anode plate, so that the medical wastewater after electrolytic oxidation in step 1 falls into the post-oxidation component in sequence for post-electrolytic oxidation;

[0039] Step 3, the pharmaceutical wastewater after electrolytic oxidation in step 2 is retained in the sedimentation area;

[0040] Step 4: After the predetermined time is reached, the first flow control valve and the second flow control valve are adjusted to adjust the flow rate of the circulation pipeline to 1.5 to 2 times the flow rate of the wastewater transport pipeline;

[0041] Step 5, starting the circulation pump to simultaneously transmit the medical wastewater in the sedimentation area and the new medical wastewater to the atomizing nozzle for spraying;

[0042] Step six, repeat steps one to three, adjust the flow of the third flow control valve to be equal to the flow of the water inlet pipeline, open the discharge pipeline, and discharge the medical wastewater from the sedimentation area.

[0043] Furthermore, the water pressure of the water inlet pipeline is 5~7Mpa;

[0044] The time T for the droplets to flow through the pre-oxidation zone is ≥ 3s;

[0045] The rotation speed of the second anode plate is 1-3 n / min;

[0046] The power supply of the pre-electrolysis assembly adopts a constant current transformer mode, the power supply current is greater than 800A, and the voltage range is 6-12V;

[0047] The power supply of the post-electrolysis component adopts a constant current transformer mode, the power supply current range is 450~600A, and the voltage range is between 6~8V.

[0048] The terminal treatment method of pharmaceutical wastewater of the present invention sprays the pharmaceutical wastewater in a mist form on a longitudinally arranged front electrolytic assembly for electrocatalytic oxidation reaction, and the wastewater after primary oxidation is then subjected to secondary oxidation by a rear electrolytic assembly, and finally precipitates to remove particles and flocculants generated in the wastewater. The flow rate of the circulation pipeline is 1.5 to 2 times the flow rate of the wastewater delivery pipeline, and after the newly entered wastewater is diluted with the treated wastewater, only one treatment is required to oxidize and decompose COD and other organic substances that are difficult to degrade in the wastewater, thereby achieving the purpose of purifying water quality.

[0049] Furthermore, since the wastewater is treated by the pharmaceutical wastewater terminal treatment device as described above, the effect of taking in water and discharging water at the same time can be achieved, and the treatment demand for a large amount of pharmaceutical wastewater can be met, thereby improving the wastewater treatment efficiency while ensuring the discharge water requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0051] Figure 1 This is a schematic diagram of the process of the terminal treatment device for pharmaceutical wastewater according to an embodiment of the present invention;

[0052] Figure 2 It is a three-dimensional schematic diagram of the device body according to an embodiment of the present invention;

[0053] Figure 3 It is a schematic cross-sectional view of a corresponding post-oxidation component in the device body according to an embodiment of the present invention;

[0054] Figure 4 It is a three-dimensional schematic diagram of the device body without the top cover according to the embodiment of the present invention;

[0055] Figure 5 It is a top view schematic diagram of the device body without the top cover according to the embodiment of the present invention;

[0056] Figure 6 for Figure 5 Schematic cross-sectional view at AA in the middle;

[0057] Figure 7 for Figure 5 A schematic cross-sectional view of the middle BB;

[0058] Figure 8 It is a three-dimensional schematic diagram of the spray assembly and the atomizing nozzle according to the embodiment of the present invention;

[0059] Fig. 9 It is a schematic diagram of the connection structure of the atomizing nozzle described in an embodiment of the present invention.

[0060] Description of reference numerals:

[0061] 1. Device body; 2. Water inlet pipeline; 3. Discharge pipeline; 4. Circulation pipeline; 5. Circulation pump;

[0062] 6. First flow control valve; 7. Second flow control valve; 8. Third flow control valve;

[0063] 9. Wastewater transportation pipeline;

[0064] 101, box body; 102, spraying area; 103, pre-oxidation area; 104, post-oxidation area; 105, precipitation area; 106, support; 107, exhaust port;

[0065] 1020, atomizing nozzle; 1021, second driving part; 1022, connecting rod; 1023, connecting arm; 1024, connecting plate; 1025, swing rod; 1026, hinged rod; 1027, rod end bearing; 1028, nozzle seat; 1029, straight plate;

[0066] 1031, a first anode plate; 1032, a first cathode plate;

[0067] 1041, second anode plate; 1042, second cathode plate; 1043, first driving unit; 1044, first bearing; 1045, mounting plate; 1046, scraper; 1047, arc plate;

[0068] 10421. Flow hole. DETAILED DESCRIPTION

[0069] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0070] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0071] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0072] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0073] The present embodiment relates to a terminal treatment device for pharmaceutical wastewater. Generally speaking, the treatment device is used in the deep treatment stage, and is mainly used to oxidatively decompose substances such as COD that are difficult to biodegrade in the pharmaceutical wastewater after biochemical treatment.

[0074] Therefore, the terminal treatment device for pharmaceutical wastewater of this embodiment is as follows: Figures 1 to 3 As shown, the device comprises a device body 1, a water inlet pipeline 2 connected to the top of the device body 1, a discharge pipeline 3 and a circulation pipeline 4 arranged at the bottom of the device body 1, and a circulation pump 5 arranged on the circulation pipeline 4. The circulation pipeline 4 is connected to the water inlet pipeline 2, and a wastewater conveying pipeline 9 is also arranged at the connection between the water inlet pipeline 2 and the circulation pipeline 4, and the wastewater conveying pipeline 9 is used to convey the medical wastewater to be treated.

[0075] The device body 1 includes a box 101 with a reaction chamber, which is divided from top to bottom into a spraying area 102, a pre-oxidation area 103, a post-oxidation area 104 and a precipitation area 105. The spraying area 102 is provided with a spraying assembly connected to the box 101 and a plurality of atomizing nozzles 1020 connected to the water inlet pipe 2, and the spraying assembly drives the atomizing nozzles 1020 to swing back and forth.

[0076] Further, the pre-oxidation zone 103 is provided with a pre-electrolysis assembly arranged longitudinally in the box 101, and the post-oxidation zone 104 is provided with a post-electrolysis assembly arranged transversely in the box 101. The cross-sectional area of ​​the post-oxidation zone 104 is larger than that of the pre-oxidation zone 103, the sedimentation zone 105 is formed at the bottom of the box 101, and the discharge pipeline 3 and the circulation pipeline 4 are respectively connected to the sedimentation zone 105. The first flow control valve 6 is provided on the wastewater delivery pipeline 9, the second flow control valve 7 is provided on the circulation pipeline 4, and the third flow control valve 8 is provided on the discharge pipeline 3.

[0077] The terminal treatment device for pharmaceutical wastewater of this embodiment converts wastewater into droplet form by using an atomizing nozzle 1020. The droplets formed by the wastewater undergo two-stage electrolytic oxidation of a front electrolytic component and a rear electrolytic component. Under the action of the electric field, high-potential hydroxyl radicals such as OH- are generated in the anode region, which can degrade organic pollutants in the water and oxidize organic matter into CO2 and H2O.

[0078] It should be pointed out that in the process of medical treatment and drug production, high-concentration salt solutions are often used as solvents or raw materials. These solutions become part of the wastewater after use, resulting in a large amount of inorganic salt by-products in the wastewater. In addition, inorganic salts generated by the neutralization of acid and alkali substances used in drug production are also an important reason for the high salt content in Western medicine wastewater.

[0079] Therefore, treating high salinity in western medicine wastewater is an important environmental issue. Because high salinity has an inhibitory effect on microorganisms, traditional biological treatment methods are not effective in treating high-salinity wastewater. Commonly used treatment methods include physical and chemical methods and biological methods, but these methods require large investments, high operating costs, and are difficult to achieve the expected purification effect.

[0080] In the pre-oxidation zone 103 and the post-oxidation zone 104, the formula for the electrolytic oxidation of sodium chloride is as follows:

[0081]

[0082] In this embodiment, a pre- and post-electrocatalytic method is adopted, and sodium hypochlorite is generated by the combined oxidation of the anode and cathode during the electrolysis process. Sodium hypochlorite can be used as an oxidant to degrade organic pollutants in the water again.

[0083] In addition, the pre-electrolysis assembly is arranged longitudinally, and the wastewater is sprayed in the form of droplets. The wastewater flows through the pre-electrolysis assembly instead of being immersed as in the prior art, which reduces energy consumption and loss of the anode plate. In addition, the wastewater produces oxygen, hydrogen and carbon dioxide during the electrocatalytic oxidation process. Oxygen can directly participate in the oxidation reaction at the anode to help degrade organic matter. Hydrogen and carbon dioxide react and float on the side walls of the plate. Since there is no electrolyte constraint between the plates, the gas dispersion is higher, thereby forming resistance in the process of the droplets falling. When the resistance is equal to the gravity of the droplets, the droplets move at a uniform speed, thereby adapting to the constant current mode of the power supply of the pre-electrolysis assembly, thereby protecting the electrode plate and extending its service life.

[0084] In addition, a horizontally arranged post-electrolysis assembly is arranged below the pre-electrolysis assembly to electrolyze and oxidize the sewage that has not been completely electrolytically oxidized in the pre-electrolysis assembly to further remove the COD in the sewage, and finally precipitate the particles or flocculants in the precipitation area 105. In addition, the sewage that has been electrocatalytically oxidized once is sprayed, oxidized, and precipitated again through the transportation of the circulation pump 5 to reduce the COD content in the difficult-to-degrade sewage to less than 50 mg / L for discharge. The first flow control valve 6, the second flow control valve 7, and the third flow control valve 8 are also arranged to coordinate the water inlet of the wastewater delivery pipeline 9, and the treated water in the circulation pipeline 4 is diluted with the new sewage to reduce the water inlet pipeline 2.

[0085] Based on the above overall introduction, an exemplary structure of the pharmaceutical wastewater terminal treatment device of this embodiment is as follows: Figures 1 to 3 As shown, the box body 101 is formed into an irregular rectangular parallelepiped structure, specifically consisting of an upper box body 101 and a lower box body 101, and the cross-sectional area of ​​the upper box body 101 is smaller than the cross-sectional area of ​​the lower box body 101. Figure 1 As shown in the device body 1 in the figure, the spraying area 102 and the pre-oxidation area 103 are arranged in the upper box body 101, and the post-oxidation area 104 and the precipitation area 105 are arranged in the lower box body 101.

[0086] As a preferred implementation mode, Figure 1 , Figure 3 , Figure 5 As shown, the front electrolysis assembly includes a plurality of first anode plates 1031 and first cathode plates 1032 arranged alternately, and the first anode plates 1031 and the first cathode plates 1032 are electrically connected to an external power source respectively. The diameter of the droplets sprayed by the atomizing nozzle 1020 is 20-30 μm, and the spacing between the first anode plates 1031 and the first cathode plates 1032 ranges from 2 mm to 4 mm.

[0087] As Figure 1 and Figure 3As shown, multiple first anode plates 1031 and second cathode plates 1042 are alternately arranged in sequence along the width direction of the upper box body 101. During production, the first anode plates 1031 and the first cathode plates 1032 are first connected to a mounting base, and then placed into the upper box body 101 as a whole, and the mounting base is fixed to the upper box body 101 by bolt connection.

[0088] The droplet diameter of the atomizing nozzle 1020 of this embodiment is 20-30μm, and the sewage liquid is broken into tiny droplets to increase the contact area between the gas and the liquid, thereby improving the mass transfer efficiency and reaction speed. During the electrolysis of wastewater, water molecules generate H+ and OH- through electricity, which migrate in a directional manner under the drive of the electric field and precipitate hydrogen and oxygen on the surface of the cathode plate and the anode plate respectively. The diameter of the newly generated bubbles is very small, with hydrogen bubbles of about 10-30μm and oxygen bubbles of about 20-60μm. The tiny droplets can absorb and react faster, shorten the processing time, and accelerate the oxidation and decomposition of pollutants such as organic matter in the wastewater.

[0089] Secondly, the droplet diameter is set to 20-30μm, and the width of the plate electrode cathode and anode is controlled at 2~4mm, which can avoid the defect of low oxidation efficiency caused by excessive electrode spacing in the prior art, and also take into account the defect of structural blockage caused by too small a distance between electrode plates.

[0090] Furthermore, the height range of the first anode plate 1031 and the first cathode plate 1032 of this embodiment is between 850 and 1000 mm. By adjusting the first flow control valve 6 to control the flow rate, combined with the height range of the first anode plate 1031 and the first cathode plate 1032, the residence time of the droplets sprayed by the atomizing nozzle 1020 in the pre-oxidation zone 103 can be controlled. The residence time set in this embodiment is ≥3s, which ensures that the sewage is in contact with the electrode plate within a certain length range to achieve a better oxidation effect.

[0091] like Figure 1 , Figure 3 , Figure 6 as well as Figure 7 As shown, the post-oxidation zone 104 includes a second anode plate 1041 and a second cathode plate 1042 spaced apart from each other, and the second anode plate 1041 and the second cathode plate 1042 are electrically connected to an external power source, respectively. The cross section of the second anode plate 1041 is larger than the cross section of the front electrolysis assembly. The second anode plate 1041 is provided with a plurality of flow holes 10421, through which the medical wastewater flows to the second cathode plate 1042.

[0092] As Figure 3As shown, the second anode plate 1041 and the second cathode plate 1042 are both circular electrode plates. The second anode plate 1041 is arranged directly below the pre-electrolysis assembly. After the droplets form a water flow in the pre-electrolysis assembly, they completely fall on the second anode plate 1041. The organic matter that is not completely electrolytically catalytically oxidized in the pre-oxidation zone 103 first undergoes an electrolytic reaction with the second anode plate 1041. After the sewage is oxidized at the anode, it enters the cathode. The bubbles after the cathode reaction will not be attached to the upper surface of the second anode plate 1041 above it in large quantities, thereby further ensuring the oxidation effect of the anode and avoiding anode scaling.

[0093] Preferably, if Figures 5 to 7 As shown, a first driving part 1043 is provided on the outer side of the bottom of the box body 101, and a power output shaft of the first driving part 1043 is key-connected with the second anode plate 1041, and the power output shaft of the first driving part 1043 passes through the second cathode plate 1042, and a first bearing 1044 is provided between the second cathode plate 1042 and the power output shaft of the first driving part 1043. The first bearing 1044 is a deep groove ball bearing.

[0094] The first driving part 1043 adopts a servo motor to drive the second anode plate 1041 to rotate. In this way, when the wastewater continuously flows into the lower box 101 and the liquid level fills the post-oxidation zone 104, the rotation of the second anode plate 1041 forms a stirring of the wastewater in the post-oxidation zone 104, which plays a stirring role to ensure that the electrolyte in the wastewater, such as sodium chloride, is evenly distributed on the electrode surface, thereby reducing the current density and avoiding polarization caused by excessive local current. And the potential of the second anode plate 1041 and the first cathode plate 1032 can be controlled by stirring to ensure the stability of the electrolysis process.

[0095] In addition, combined Figure 5 and Figure 7 As shown, mounting plates 1045 are connected to both sides of the second cathode plate 1042, and the mounting plates 1045 are fixed in the box body 101. A scraper 1046 is connected to the mounting plate 1045 on one side, and the length direction of the scraper 1046 extends along the radial direction of the second anode plate 1041. The scraper 1046 is arranged above the second anode plate 1041. The mounting plate 1045 is made of U-shaped stainless steel profile and is fixed in the lower box body 101 by bolts or welding. The second cathode plate 1042 is fixed to the mounting seat by bolts. During installation, a panel on one side of the lower box body 101 is detachable, which is convenient for replacing and cleaning the second cathode plate 1042 and the second anode plate 1041. A sealing strip is arranged around the detachable panel to avoid leakage.

[0096] like Figure 3As shown, the scraper 1046 is a rectangular plate vertically arranged on the second anode plate 1041, and an arc plate 1047 is also arranged on the scraper 1046. The arc plate 1047 is correspondingly arranged above the edge of the second anode plate 1041. The scraper 1046 and the arc plate 1047 are arranged to evenly spread the dripping wastewater at the initial stage of liquid inflow, and facilitate the wastewater to flow into the second cathode plate 1042. In addition, the scraper 1046 and the arc plate 1047 increase the stirring amplitude during the rotation process, increase the uniformity of the wastewater in the post-oxidation zone 104, so as to effectively oxidize the organic matter in the circulating loop and the newly entered wastewater, and ensure the removal effect of COD.

[0097] like Figure 3 and Figure 8 As shown, the spray assembly includes a second driving unit 1021, a transmission assembly provided at the power output end of the second driving unit 1021, a connecting rod 1022 connected to one end of the transmission assembly, and a swing arm assembly provided on the connecting rod 1022. Both ends of the swing arm assembly are hinged on the box body 101. A plurality of atomizing nozzles 1020 are arranged at intervals along the length direction of the swing arm. A plurality of swing arm assemblies are arranged along the arrangement direction of a plurality of first anode plates 1031 and first cathode plates 1032. The second driving unit 1021 drives the swing arm assembly to swing back and forth along the extension direction of the first anode plate 1031.

[0098] Still Figure 3 and Figure 8 As shown, the second driving part 1021 adopts a driving motor, and the transmission assembly includes a connecting arm 1023 connected to the power output end of the second driving part 1021, a connecting plate 1024 pivotally connected to the connecting arm 1023, and the connecting plate 1024 is sleeved on the connecting rod 1022. The swing assembly includes a swing rod 1025 arranged along the length direction of the upper box body 101, and a hinge rod 1026 connected to both sides of the swing rod 1025. In order to facilitate swinging, a rod end bearing 1027 is arranged on the swing rod 1025, and one end of the hinge rod 1026 is connected to the rod end bearing 1027 through a pin shaft. In addition, a support 106 is arranged on the upper box body 101, and the other end of the hinge rod 1026 is pivotally connected to the support 106 through a pin shaft. A plurality of rocker arms 1025 are sleeved on the connecting rod 1022 . The connecting rod 1022 of this embodiment is a screw rod. Nuts connected to the connecting rod 1022 are provided at both ends of the rocker arms 1025 to limit the position of each rocker arm 1025 .

[0099] like Figure 8 and Fig. 9As shown, the atomizing nozzle 1020 is L-shaped, one end of the atomizing nozzle 1020 is connected to the water inlet pipe 2 through a hose, and a plurality of water outlet joints are provided on the water inlet pipe 2. The atomizing nozzle 1020 is connected to the top cover of the upper box body 101 through a nozzle seat 1028. The nozzle seat 1028 is L-shaped, the horizontal plate of the nozzle seat 1028 is fixed to the box body 101, and a diamond-shaped bearing seat is provided on the vertical plate of the nozzle seat 1028. The atomizing nozzle 1020 is connected to the nozzle seat 1028 through the diamond-shaped bearing seat, and the other end of the atomizing nozzle 1020 is fixed to the swing rod 1025 through a straight plate 1029. In order to facilitate the output of the reaction gas in the box body 101, an exhaust port 107 is provided on the top of the top cover.

[0100] The second driving unit 1021 is started, and the second driving unit 1021 drives the connecting arm 1023 to rotate, so that one end of the connecting plate 1024 rotates accordingly, and the other end is constrained by the hinge rod 1026, and the swing arm 1025 swings left and right with the connecting rod 1022 and the connecting plate 1024, thereby driving the straight plate 1029 and the atomizing nozzle 1020 to swing back and forth, so that the droplets can be evenly dropped on the first anode plate 1031 and the first cathode plate 1032, thereby improving the uniformity of droplet adhesion, thereby improving the oxidation efficiency and the effect of decomposing organic matter.

[0101] As a preferred implementation, the first anode plate 1031 and the second anode plate 1041 of this embodiment both use titanium oxide electrode Ti4O7, which is a non-sacrificial oxygen evolution anode with strong catalytic oxidation ability, stable chemical and electrochemical properties, high efficiency, long service life, etc. The first cathode plate 1032 and the second cathode plate 1042 use stainless steel electrode 316L to improve the corrosion resistance of the cathode.

[0102] In addition, this embodiment also relates to a method for terminal treatment of pharmaceutical wastewater, which adopts the above-mentioned pharmaceutical wastewater terminal treatment device and comprises the following steps:

[0103] Step 1: transport the pharmaceutical wastewater to the water inlet pipe 2 through the wastewater transport pipe 9, and the atomizing nozzle 1020 sprays the pharmaceutical wastewater in a mist form on the pre-electrolysis component for pre-electrolysis oxidation;

[0104] Step 2, adjusting the rotation speed of the second anode plate 1041, and the pharmaceutical wastewater after electrolytic oxidation in step 1 falls into the post-oxidation component in sequence for post-electrolytic oxidation;

[0105] Step 3, the pharmaceutical wastewater after electrolytic oxidation in step 2 is retained in the sedimentation area 105;

[0106] Step 4: After the predetermined time is reached, adjust the first flow control valve 6 and the second flow control valve 7 to adjust the flow of the circulation pipeline 4 to 1.5 to 2 times the flow of the wastewater delivery pipeline 9;

[0107] Step 5, start the circulation pump 5 to simultaneously transmit the pharmaceutical wastewater in the sedimentation area 105 and the new pharmaceutical wastewater to the atomizing nozzle 1020 for spraying;

[0108] Step six, repeat steps one to three, adjust the flow rate of the third flow control valve 8 to be equal to the flow rate of the water inlet pipeline 2, open the discharge pipeline 3, and discharge the medical wastewater in the sedimentation area 105.

[0109] In addition, as a specific implementation method, Figure 1 As shown, stop valves are provided on the wastewater delivery pipeline 9 and the circulation pipeline 4 to facilitate isolation during maintenance of the device body.

[0110] As a preferred implementation mode, in the terminal treatment method of pharmaceutical wastewater, the water pressure of the water inlet pipe 2 is 5~7Mpa; the time T for the droplets to flow through the pre-oxidation zone 103 is ≥3s; the rotation speed of the second anode plate 1041 is 1~3n / min; the power supply of the pre-electrolysis component adopts a constant current transformer mode, the power supply current is greater than 800A, and the voltage range is 6-12V; the power supply of the post-electrolysis component adopts a constant current transformer mode, the power supply current range is 450~600A, and the voltage range is between 6~8V.

[0111] The terminal treatment method of pharmaceutical wastewater in this embodiment is to spray the pharmaceutical wastewater in a mist form on the longitudinally arranged front electrolytic component for electrocatalytic oxidation reaction, and the wastewater after primary oxidation is then subjected to secondary oxidation by the rear electrolytic component, and finally precipitated to remove particles and flocculants generated in the wastewater. The flow rate of the circulation pipeline 4 is 1.5 to 2 times the flow rate of the wastewater delivery pipeline 9, and after the newly entered wastewater is diluted with the treated wastewater, only one treatment is required to oxidize and decompose the COD and other organic matter in the wastewater that is difficult to degrade, thereby achieving the purpose of purifying water quality.

[0112] Furthermore, since the above-mentioned pharmaceutical wastewater terminal treatment device is used to treat wastewater, during the first wastewater treatment, the clarified water in the sedimentation area 105 is subjected to secondary atomization and oxidation through internal circulation. When new wastewater subsequently enters, the flow ratio of wastewater and circulating water is adjusted to achieve an internal circulation effect of taking in water and discharging water at the same time, thereby adapting to the treatment needs of a large amount of pharmaceutical wastewater and improving the wastewater treatment efficiency while ensuring the discharge water requirements.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A terminal treatment device for pharmaceutical wastewater, characterized in that: It comprises a device body (1), a water inlet pipeline (2) connected to the top of the device body (1), a discharge pipeline (3) and a circulation pipeline (4) arranged at the bottom of the device body (1), and a circulation pump (5) arranged on the circulation pipeline (4); The circulation pipeline (4) is in communication with the water inlet pipeline (2), and a wastewater transport pipeline (9) is also provided at the connection between the water inlet pipeline (2) and the circulation pipeline (4), wherein the wastewater transport pipeline (9) is used to transport the medical wastewater to be treated; The device body (1) comprises a box (101) having a reaction chamber, wherein the reaction chamber is divided from top to bottom into a spraying area (102), a pre-oxidation area (103), a post-oxidation area (104), and a precipitation area (105); The spraying area (102) is provided with a spraying assembly connected to the box (101), and a plurality of atomizing nozzles (1020) connected to the water inlet pipeline (2), and the spraying assembly drives the atomizing nozzles (1020) to swing back and forth; The front oxidation zone (103) is provided with a front electrolysis component longitudinally arranged in the box (101), and the rear oxidation zone (104) is provided with a rear electrolysis component transversely arranged in the box (101); The cross-sectional area of ​​the post-oxidation zone (104) is larger than that of the pre-oxidation zone (103); the precipitation zone (105) is formed at the bottom of the box (101); and the discharge pipeline (3) and the circulation pipeline (4) are respectively connected to the precipitation zone (105); The wastewater transport pipeline (9) is provided with a first flow control valve (6), the circulation pipeline (4) is provided with a second flow control valve (7), and the discharge pipeline (3) is provided with a third flow control valve (8); The front electrolysis assembly comprises a plurality of first anode plates (1031) and first cathode plates (1032) arranged in an interlaced manner, and the first anode plates (1031) and the first cathode plates (1032) are respectively electrically connected to an external power source; The diameter of the droplets sprayed by the atomizing nozzle (1020) is 20-30 μm; The distance between the first anode plate (1031) and the first cathode plate (1032) is in the range of 2 mm to 4 mm; The height of the first anode plate (1031) and the first cathode plate (1032) ranges from 850 to 1000 mm; The post-oxidation zone (104) comprises a second anode plate (1041) and a second cathode plate (1042) which are arranged in an upper and lower spaced relationship, and the second anode plate (1041) and the second cathode plate (1042) are respectively electrically connected to an external power source; The cross section of the second anode plate (1041) is larger than the cross section of the front electrolysis assembly; The second anode plate (1041) is provided with a plurality of flow holes (10421), and the medical wastewater flows toward the second cathode plate (1042) through the flow holes (10421); A first driving unit (1043) is provided on the outer side of the bottom of the box body (101); a power output shaft of the first driving unit (1043) is key-connected to the second anode plate (1041); the power output shaft of the first driving unit (1043) passes through the second cathode plate (1042); and a first bearing (1044) is provided between the second cathode plate (1042) and the power output shaft of the first driving unit (1043).

2. The pharmaceutical wastewater terminal treatment device according to claim 1 is characterized in that: The second cathode plate (1042) is connected to mounting plates (1045) on both sides, the mounting plates (1045) being fixed in the box body (101), and a scraper (1046) is connected to the mounting plate (1045) on one side, the length direction of the scraper (1046) extending along the radial direction of the second anode plate (1041), and the scraper (1046) is arranged above the second anode plate (1041).

3. The terminal treatment device for pharmaceutical wastewater according to claim 2 is characterized in that: The spray assembly comprises a second driving part (1021), a transmission assembly arranged at a power output end of the second driving part (1021), a connecting rod (1022) connected to one end of the transmission assembly, and a swing rod assembly arranged on the connecting rod (1022); Both ends of the swing arm assembly are hinged on the box body (101); A plurality of atomizing nozzles (1020) are arranged at intervals along the length direction of the swing rod; A plurality of the swing arm assemblies are arranged along the arrangement direction of the plurality of the first anode plates (1031) and the first cathode plates (1032); The second driving unit (1021) drives the swing rod assembly to swing back and forth along the extension direction of the first anode plate (1031).

4. The terminal treatment device for pharmaceutical wastewater according to claim 1 is characterized in that: The first anode plate (1031) and / or the second anode plate (1041) are titanium dioxide electrodes; The first cathode plate (1032) and / or the second cathode plate (1042) are made of stainless steel electrodes.

5. A method for terminal treatment of pharmaceutical wastewater, characterized in that: The pharmaceutical wastewater terminal treatment device according to any one of claims 1 to 4 comprises the following steps: Step 1, transporting the pharmaceutical wastewater to the water inlet pipeline (2) through the wastewater transport pipeline (9), and the atomizing nozzle (1020) sprays the pharmaceutical wastewater in a mist form onto the pre-electrolysis component for pre-electrolysis oxidation; Step 2, adjusting the rotation speed of the second anode plate (1041), so that the pharmaceutical wastewater after electrolytic oxidation in step 1 falls into the post-electrolytic component in sequence for post-electrolytic oxidation; Step 3, the pharmaceutical wastewater after electrolytic oxidation in step 2 is retained in the sedimentation area (105); Step 4: after the predetermined time has elapsed, adjusting the first flow control valve (6) and the second flow control valve (7) to adjust the flow rate of the circulation pipeline (4) to 1.5 to 2 times the flow rate of the wastewater transport pipeline (9); Step 5, starting the circulation pump (5) to simultaneously transmit the pharmaceutical wastewater in the sedimentation area (105) and the new pharmaceutical wastewater to the atomizing nozzle (1020) for spraying; Step six, repeating steps one to three, adjusting the flow rate of the third flow control valve (8) to be equal to the flow rate of the water inlet pipeline (2), opening the discharge pipeline (3), and discharging the medical wastewater from the sedimentation area (105).

6. The method for terminal treatment of pharmaceutical wastewater according to claim 5, characterized in that: The water pressure of the water inlet pipeline (2) is 5-7 MPa; The time T for the droplets to flow through the pre-oxidation zone (103) is ≥ 3 s; The rotation speed of the second anode plate (1041) is 1-3 n / min; The power supply of the pre-electrolysis assembly adopts a constant current transformer mode, the power supply current is greater than 800A, and the voltage range is 6-12V; The power supply of the post-electrolysis component adopts a constant current transformer mode, the power supply current range is 450~600A, and the voltage range is between 6~8V.

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