A device and process for treating pharmaceutical and chemical industrial wastewater

Abstract

This application relates to the technical field of wastewater treatment, and provides a pharmaceutical and chemical wastewater treatment device and process. The device includes an electrocoagulation flotation unit, comprising a tank, an aeration and release mechanism mounted on the tank for aeration and releasing dissolved air water, a scraping mechanism for scraping scum, and a control mechanism electrically connected to each mechanism. The tank's internal cavity, along its length, sequentially comprises a coagulation reaction zone, an aeration reaction zone, a flotation zone, and a scum collection zone. A wastewater inlet pipe is provided in the coagulation reaction zone. The aeration and release mechanism is located within the aeration reaction zone. A control valve electrically connected to the control mechanism is installed on the wastewater inlet pipe. The scraping mechanism is located above the flotation zone and the scum collection zone. This application has the beneficial effect of improving wastewater treatment efficiency.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and in particular to a pharmaceutical and chemical wastewater treatment device and process. Background Technology

[0002] The pharmaceutical and chemical industry generates a large amount of organic wastewater during the production process. In this regard, the existing technology usually selects electrocoagulation flotation machine to treat the wastewater generated by pharmaceutical and chemical industries. In the existing technology, the flotation machine usually includes a flocculation reaction tank, a mixing tank, a flotation tank and a sludge tank.

[0003] Wastewater first enters the flocculation reaction tank. An electric field is generated between aluminum plates through which the wastewater flows, causing it to flow into the gaps between the plates. In this electric field, some of the energized aluminum plates are consumed and enter the water. Ionic and non-ionic pollutants in the electric field are energized and react with the ionization products and the aluminum ions consumed in the water. During this process, various ions interact and typically combine in their most stable form to form solid particles, creating suspended flocs. These flocs then enter the mixing tank and adhere to the dissolved air bubbles in the dissolved air water, forming bubble flocs. These flocs then flow along a guide plate between the mixing tank and the flotation tank into the flotation tank and float to the surface, forming scum. This scum is then scraped off by a scraper assembly on the flotation machine and transferred to a sludge tank, thus purifying the water.

[0004] Because the partition between the flotation tank and the sludge tank in the existing technology, as well as the size of the scraper in the scraping assembly, are fixed, and the quality of the suspended flocs produced during the treatment process will vary, the fixed-height scraper may not be able to scrape the flocs in place, affecting the treatment effect of wastewater. Therefore, further improvements are needed. Summary of the Invention

[0005] To improve the treatment effect of wastewater, this application provides a pharmaceutical and chemical wastewater treatment device and process.

[0006] This application provides a pharmaceutical and chemical wastewater treatment device and process, which adopts the following technical solution: A pharmaceutical and chemical wastewater treatment device includes an electrocoagulation and flotation unit. The electrocoagulation and flotation unit comprises a tank body, an aeration and release mechanism mounted on the tank body for aeration and releasing dissolved air water, a scraping mechanism for scraping scum, and a control mechanism electrically connected to each mechanism. The tank body has, along its length, a coagulation reaction zone, an aeration reaction zone, a flotation zone, and a scum collection zone. A wastewater inlet pipe is provided in the coagulation reaction zone. The aeration and release mechanism is located within the aeration reaction zone. A control valve electrically connected to the control mechanism is installed on the wastewater inlet pipe. The scraping mechanism is located above the flotation zone and the scum collection zone. The scraping mechanism includes a mounting plate and a sliding mechanism. The system includes a scraper connected to a mounting plate, a drive assembly for mounting the scraper to scrape off scum, an adjustment track for sliding the scraper to change the scraping range, and a cleaning assembly for cleaning the scum adhering to the scraper into a scum collection area. A partition is provided between the flotation zone and the scum collection area. A guide plate is provided on the side of the partition near the flotation zone, which is inclined downwards. The adjustment track, in the direction near the scraping zone, includes a descending section for driving the scraper downwards, a translating section for scraping off scum, and an ascending section parallel to the guide plate. The lower end of the scraper is used to abut against the guide plate. The sewage level in the tank is lower than the height of the upper surface of the partition.

[0007] By adopting the above technical solution, the descending section of the regulating track can be used to drive the scraper downwards to extend into the water, thereby increasing the scraping range. With the drive assembly, the scraper slides along the translation section. When it slides to the ascending section, since the ascending section is parallel to the guide plate and the lower end of the scraper abuts against the guide plate, the scum moves towards the scum collection area. This movement reduces the water content in the scum, thus reducing the water content of the scum collected in the scum collection area and reducing the frequency of cleaning. Since some scum has a certain degree of stickiness, it may adhere to the scraper and then fall back into the flotation zone with the drive assembly. A cleaning component is provided to clean the scum adhering to the scraper, thereby improving the wastewater treatment effect.

[0008] Preferably, the cleaning assembly includes a cleaning plate abutting against the side wall of the scraper, which is used to clean the scum adhering to the scraper when the scraper rises along the rising section of the adjusting track.

[0009] Preferably, a plurality of scrapers are provided, and the cleaning plate is disposed above the slag collection area. The cleaning plate is used to abut against the surface of the scraper near the slag collection area. As the scraper rises along the rising section of the adjusting track, the cleaning plate slides along the length of the pool body or slides downward at an incline toward the slag collection area. The pool body is provided with a reset component for driving the cleaning plate to reset so as to scrape the slag on the next scraper.

[0010] By adopting the above technical solution, the cleaning plate is set above the slag collection area. As the scraper moves along the rising section of the adjusting track and disengages from the guide plate, some of the scraped slag falls to the slag collection area below due to gravity, while some slag near the scraper adheres to it. At this time, the drive component drives the scraper to continue moving to abut against the cleaning plate, thereby driving the cleaning plate to move along the length of the pool or to slide downwards at an incline towards the slag collection area. As the scraper rises, it scrapes off the slag adhering to the scraper, thus moving it to the lower surface of the cleaning plate. When it rises to disengage from the cleaning plate, the scraping of the slag adhering to one scraper is completed. The reset component drives the scraper to reset, thereby continuing to scrape off the slag adhering to the next scraper.

[0011] Compared to a cleaning component directly mounted on the scraper, this setup uses a pushing component within the cleaning component to move the cleaning plate against the scraper along the height direction to complete the cleaning of the scraper. This one-to-one setup reduces the number of cleaning components required, allowing one cleaning component to clean multiple scrapers, thus reducing costs. Furthermore, since cleaning components mounted on the scraper may continue to scrape scum from the flotation zone as the scraper moves, some scum may adhere to the cleaning plate, carrying it into the flotation zone and affecting cleaning efficiency. Positioning the cleaning plate above the scum collection area reduces these problems, minimizing the impact on scum cleaning efficiency and relatively improving overall scum cleaning efficiency.

[0012] Preferably, the surface of the cleaning plate near the slag collection area is provided with an arc surface, and the arc shape of the arc surface is arranged in a direction away from the slag collection area.

[0013] By adopting the above technical solution, the surface of the cleaning plate near the slag collection area is provided with an arc surface, and the arc shape of the arc surface is set in the direction away from the slag collection area. This can be used to make the scraped and sticky floating slag move along the arc surface in the direction closer to the slag collection area, reducing the possibility of the scraped floating slag adhering to the cleaning plate.

[0014] Preferably, the reset assembly includes a sliding track disposed on the two opposite inner sidewalls of the pool body, a first slider slidably connected to the sliding track, a slide rod connected to the first slider and the cleaning plate, a reset spring coaxially sleeved on the slide rod, and a fixing plate through which the slide rod slides. The fixing plate is fixed to the pool body, and the reset spring is disposed between the cleaning plate and the fixing plate. The reset spring forces the cleaning plate to move toward the scraper.

[0015] By adopting the above technical solution, the first slider is slidable via a sliding track. As the scraper abuts against the cleaning plate, the drive assembly drives the scraper to slide, thereby squeezing the cleaning plate and causing the first slider to slide along the length of the sliding track, squeezing the reset spring and applying a certain squeezing force to the reset spring. When the scraper is disengaged from the cleaning plate, the reset spring converts the squeezing force into a pushing force to push the cleaning plate, so that the cleaning plate is reset, thereby cleaning the scum adhering to the next scraper.

[0016] Preferably, the sliding track includes a sliding section that slides as the scraper abuts against it, a vibrating section disposed above or below the sliding section, and a connecting section for connecting the sliding section and the vibrating section. Two connecting sections are provided so that the sliding track forms a closed loop. The vibrating section is wavy in the direction closer to the guide plate. A second sliding groove is provided on the side wall of the pool body. The second sliding groove is disposed on the side of the sliding track away from the guide plate. The sliding rod slides through a second slider, which is slidably connected to the second sliding groove. The second slider slides along the height direction of the second sliding groove. A limiting member is provided in the connecting section to restrict the first slider from retracting.

[0017] By adopting the above technical solution, the sliding track includes a sliding section, a shaking section, and a connecting section. The sliding section allows the cleaning plate to slide smoothly when it abuts against the cleaning plate, thereby improving the cleaning effect of the cleaning plate on the scraper. Since some of the scraped scum will adhere to the cleaning plate, in order to reduce the possibility of the cleaning plate not cleaning the next scraper properly, a shaking section is provided. During the return stroke, the scraper is pushed by the spring and moves up and down along the shaking section, thereby achieving a shaking effect to shake off some of the scum adhering to the cleaning plate, thus reducing the amount of scum adhering to the cleaning plate.

[0018] Preferably, the undulations of the jittering segment gradually become smoother in the direction away from the second slider.

[0019] By adopting the above technical solution, the main reason is that as the force of the reset spring on the cleaning plate decreases, if the fluctuation of the shaking section is constant, the reset may not be completed. Therefore, the fluctuation of the shaking section is gradually made to be smoother in the direction away from the second slider.

[0020] Preferably, the spacing between two adjacent peaks or troughs in the jittering segment gradually increases in the direction away from the second slider.

[0021] By adopting the above technical solution, in the early stage of the return stroke, the cleaning plate can pass through two short-spaced peaks or troughs relatively easily due to the relatively large spring force, thus shaking off the scum. As the spring force decreases, the distance between the two peaks or troughs gradually increases in the direction away from the second slider, thereby reducing the difficulty of sliding the first slider.

[0022] Preferably, the cleaning plate has a cavity, and the surface of the cleaning plate near the scraper has an air hole communicating with the cavity. A baffle is provided on the side of the cleaning plate near the air hole and the scraper. The air blown from the air hole is directed toward the cleaning plate. The sliding rod has a communicating cavity communicating with the cavity. A piston rod slides through the surface of the sliding rod away from the cleaning plate. A connecting plate is provided on the inner wall of the pool. The end of the piston rod away from the sliding rod is connected to the connecting plate.

[0023] By adopting the above technical solution, and by setting air holes, the air blown from the air holes is directed towards the cleaning plate to blow air onto some of the scum that has not been scraped off the cleaning plate, thereby drying some of the moisture in the scum and further reducing the water content in the scum that falls into the scum collection area.

[0024] A pharmaceutical and chemical wastewater treatment process, which selects treatment based on wastewater concentration, includes a high-concentration wastewater treatment line and a low-concentration wastewater treatment line. The process steps are as follows: First, high-concentration wastewater and low-concentration wastewater are transported through pipelines to equalization tanks in the high-concentration wastewater treatment line and low-concentration wastewater treatment line respectively for temporary storage. High-concentration wastewater undergoes primary treatment in an electrocoagulation flotation machine to remove insoluble organic matter and form scum, which is then scraped off by a scraping mechanism. Low-concentration wastewater flows to a coagulation sedimentation tank for coagulation and sedimentation for primary treatment. Secondly, the water from the high-concentration wastewater treatment line undergoing primary treatment flows to the first sedimentation tank to settle some flocs that have not been scraped by the scraping mechanism; while the water from the low-concentration wastewater treatment line undergoing primary treatment flows to the anaerobic tank for anaerobic degradation, which is a secondary treatment. A dynamic membrane is installed in the anaerobic tank to form a controllable filter membrane layer, thereby achieving separation, filtration or purification of the sediment generated in the anaerobic tank. Next, the water that has settled in the first sedimentation tank for a certain period of time flows to the Fenton oxidation tank for oxidation, so as to carry out secondary treatment of the high-concentration wastewater after primary treatment, so as to reduce the concentration of the high-concentration wastewater. After treatment, it flows to the second sedimentation tank for sedimentation. The sludge settled during this period flows to the first sludge tank for temporary storage. The wastewater after sedimentation in the second sedimentation tank flows to the anaerobic tank for treatment. Furthermore, the wastewater that flows into the anaerobic tank together is treated and then flows into the third sedimentation tank for sedimentation. The sludge that settles during this process flows into the second sludge tank for temporary storage. Finally, the wastewater in the third sedimentation tank is sequentially flowed into the biological filter and ozone oxidation tank for treatment before being discharged.

[0025] In summary, this application has the following beneficial effects: 1. By incorporating an adjustable track, the scraper rises with the ascending section to reduce the water content of the scum, thereby reducing the amount of scum collected in the scum collection zone and thus reducing the frequency of scum cleaning. Since some scum has a certain degree of stickiness, it may adhere to the scraper and then fall back into the flotation zone as driven by the drive component. Therefore, a cleaning component is provided to remove the scum adhering to the scraper, thereby improving the wastewater treatment efficiency.

[0026] 2. By placing the cleaning plate above the slag collection area, one cleaning component can correspond to multiple scrapers for cleaning, thereby reducing costs and minimizing the impact of slag being carried into the flotation zone on the slag cleaning efficiency, thus relatively improving the slag cleaning efficiency.

[0027] 3. By including a sliding section, a shaking section, and a connecting section in the sliding track, the sliding section allows the cleaning plate to slide smoothly when it abuts against the cleaning plate, thereby improving the cleaning effect of the cleaning plate on the scraper. Since some of the scraped scum will adhere to the cleaning plate, in order to reduce the possibility of the cleaning plate not cleaning the next scraper properly, a shaking section is provided. When the scraper is pushed by the spring during the return stroke, it rises and falls along the shaking section, thereby achieving a shaking effect to shake off some of the scum adhering to the cleaning plate, thus reducing the amount of scum adhering to the cleaning plate. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal structure of Embodiment 1 of this application; Figure 2 This is a schematic diagram of the scraping mechanism in Embodiment 1 of this application; Figure 3 This is a cross-sectional structural diagram of the scraper in Embodiment 1 of this application; Figure 4 This is a process flow diagram of wastewater treatment in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the cleaning component in Embodiment 2 of this application; Figure 6 yes Figure 5 A magnified view of part A in the middle; Figure 7This is a schematic diagram of the cleaning component in Embodiment 3 of this application; Figure 8 yes Figure 7 A magnified view of part B in the diagram.

[0029] Explanation of reference numerals in the attached drawings: 1. Electrocoagulation and flotation machine; 2. Tank body; 21. Coagulation reaction zone; 22. Aeration reaction zone; 23. Flotation zone; 24. Sludge collection zone; 25. Baffle plate; 26. Guide plate; 27. Second chute; 28. Second slider; 29. ​​Connecting plate; 3. Aeration release mechanism; 4. Scraping mechanism; 41. Mounting plate; 42. Scraper; 421. First chute; 422. First spring; 43. Drive assembly; 431. Drive motor; 432. Drive gear; 433. Driven gear; 434. Chain; 435. 44. Rotating shaft; 44. Adjusting track; 441. Descending section; 442. Translation section; 443. Ascending section; 45. Cleaning assembly; 451. Arc surface; 452. Cavity; 453. Air hole; 454. Baffle; 5. Reset assembly; 51. Sliding track; 511. Sliding section; 512. Shaking section; 513. Connecting section; 52. First slider; 53. Sliding rod; 531. Connecting cavity; 532. Piston rod; 54. Reset spring; 55. Fixing plate; 6. Limiting component; 61. Rotating rod; 62. Torsion spring; 63. Limiting rod. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail below.

[0031] This application discloses a pharmaceutical and chemical wastewater treatment device and its process.

[0032] Example 1: A pharmaceutical and chemical wastewater treatment device, referring to Figure 1 The system includes an electrocoagulation flotation machine 1, which includes a tank body 2, an aeration and release mechanism 3 installed on the tank body 2 for aeration and release, a scraping mechanism 4 for scraping scum, and a control mechanism electrically connected to each mechanism.

[0033] The inner cavity of tank 2 is sequentially arranged along its length as a coagulation reaction zone 21, an aeration reaction zone 22, an air flotation zone 23, and a sludge collection zone 24. A wastewater inlet pipe (not shown in the figure) is fixedly installed through the coagulation reaction zone 21. A control valve electrically connected to the control mechanism is installed on the wastewater inlet pipe. A partition 25 is installed between the air flotation zone 23 and the sludge collection zone 24. The partition 25 is fixedly connected to the bottom and opposite side walls of tank 2. A guide plate 26 inclined downwards is installed on the side of the partition 25 closest to the air flotation zone 23. The aeration release mechanism 3 specifically includes an aeration component for dissolving gas in water and a release component for releasing the formed dissolved air water into the aeration reaction zone 22 through depressurization. The aeration component and the release component are common technologies in the prior art and will not be described in detail here.

[0034] Reference Figure 1 , Figure 2 The scraping mechanism 4 is located above the flotation zone 23 and the slag collection zone 24. The scraping mechanism 4 specifically includes a mounting plate 41, a scraper 42 slidably connected to the mounting plate 41, a drive assembly 43 for mounting with the mounting plate 41 to drive the scraper 42 to scrape slag, an adjustment track 44 for allowing the scraper 42 to slide and change the slag scraping range, and a cleaning assembly 45 for cleaning the slag adhering to the scraper 42 into the slag collection zone 24.

[0035] Specifically, for the connection between the mounting plate 41 and the scraper 42, a first groove 421 can be provided on the upper end face of the scraper 42 for the mounting plate 41 to slide and insert.

[0036] The drive assembly 43 includes a drive motor 431 fixedly connected to the outer wall of the pool body 2, a drive gear 432 fixedly connected to the output shaft of the drive motor 431, a driven gear 433 rotatably connected to the inner wall of the pool body 2, a chain 434 meshing with the drive gear 432 and the driven gear 433, and two rotating shafts 435 coaxially arranged with the drive gear 432 and the driven gear 433 respectively. The output of the drive motor 431 rotatably passes through the pool body 2. There are two drive gears 432 and two driven gears 433, which are respectively arranged on opposite inner walls of the pool body 2. There are two chains 434, which are respectively wound around the drive gear 432 and the driven gear 433 located on the same side. The mounting plates 41 are fixedly connected to the chains 434 and are spaced apart along the length of the chains 434. The number of scrapers 42 corresponds to the number of mounting plates 41.

[0037] Reference Figure 2 , Figure 3The adjusting track 44, in the direction towards the scum scraping area, includes a descending section 441 for driving the scraper 42 downward, a translating section 442 for scraping scum, and an ascending section 443 parallel to the guide plate 26. The lower end of the scraper 42 abuts against the guide plate 26, and the sewage level in the tank 2 is lower than the height of the partition 25 at its upper end. It should be noted that the adjusting track 44 can be wound around the chain 434. In this case, the adjusting track 44 also includes a reset section for driving the scraper 42 to move towards the mounting plate 41 to shorten the overall height. The reset section is located above the chain 434. However, the overall length of the adjusting track 44 is relatively long with this configuration. To address this, a first spring 422 is provided in the first chute 421. The two ends of the first spring 422 are respectively connected to the lower end face of the mounting plate 41 and the inner bottom wall of the first chute 421. The first spring 422 is used to drive the scraper 42 to move towards the mounting plate 41, thereby reducing the need for a reset section.

[0038] It should be noted that, with use, the reset effect of the first spring 422 on the scraper 42 may be reduced. As a result, when the scraper 42 moves to the adjustment track 44 with the drive component 43, the adjustment track 44 may not be able to drive the scraper 42 to slide. In this embodiment, the entrance of the adjustment track 44 is flared.

[0039] The cleaning component 45 includes a cleaning plate abutting against the side wall of the scraper 42. When the scraper 42 rises along the rising section 443 of the adjusting track 44, the cleaning plate is used to clean the scum adhering to the scraper 42. It should be noted that if the cleaning plates are set corresponding to the scraper 42, the number is relatively large, and the cost is relatively high. Moreover, after the cleaning plates scrape off the scum adhering to the scraper 42, the scum on the cleaning plates also needs to be cleaned. Furthermore, some scum will be carried back to the air flotation zone 23 by the drive component 43, affecting the scum cleaning efficiency. Therefore, the cleaning plates are set above the scum collection zone 24. In this embodiment, the surface of the cleaning plate near the scum collection zone 24 is provided with an arc surface 451, and the arc shape of the arc surface 451 is set in a direction away from the scum collection zone 24. The cleaning plate is used to abut against the surface of the scraper 42 near the slag collection area 24. As the scraper 42 rises along the rising section 443 of the adjusting track 44, the cleaning plate slides along the length of the pool body 2 or slides downward at an angle towards the slag collection area 24. In this embodiment, the cleaning plate slides along the length of the pool body 2 for demonstration purposes.

[0040] In this embodiment, the pool body 2 is equipped with a reset assembly 5 for resetting the cleaning plate to scrape the scum on the next scraper 42. The reset assembly 5 specifically includes two sliding tracks 51 fixedly connected to opposite inner walls of the pool body 2, a first slider 52 slidably connected to the sliding tracks 51, a slide rod 53 connected to the first slider 52 and the cleaning plate, a reset spring 54 coaxially sleeved on the slide rod 53, and a fixing plate 55 through which the slide rod 53 slides. In this embodiment, the length direction of the sliding tracks 51 is parallel to the length direction of the pool body 2. The first slider 52 is fixedly connected to the side wall of the cleaning plate. The reset spring 54 is disposed between the cleaning plate and the fixing plate 55, with its two ends fixedly connected to the two adjacent surfaces of the cleaning plate and the fixing plate 55. The reset spring 54 forces the cleaning plate to move closer to the scraper 42. The fixing plate 55 is fixedly connected to the pool body 2.

[0041] The implementation principle of a pharmaceutical and chemical wastewater treatment device according to an embodiment of this application is as follows: As scum is generated in the flotation zone 23, the drive motor 431 is started to drive the mounting plate 41 to rotate around the chain 434. When it rotates to the adjustment track 44, the scraper 42 first slides and connects to the descending section 441 to drive the scraper 42 to descend and extend into the water to increase the scum scraping range. The scraper 42 slides along the translation section 442. When it slides to the rising section 443, since the rising section 443 is parallel to the guide plate 26 and since the lower end of the scraper 42 abuts against the guide plate 26, it drives the scum to move towards the scum collection zone 24. While moving, the water content in the scum can be reduced, thereby reducing the water content of the scum collected in the scum collection zone 24, thereby reducing the number of times the scum in the scum collection zone 24 needs to be cleaned. Since some scum has a certain degree of stickiness, it may adhere to the scraper 42 and then fall back into the flotation zone 23 as driven by the drive component 43. To address this, a cleaning component 45 is provided to clean the scum adhering to the scraper 42, thereby improving the treatment effect of wastewater.

[0042] This application also discloses a pharmaceutical and chemical wastewater treatment process, referring to... Figure 4 Treatment is selected based on wastewater concentration, including high-concentration wastewater treatment lines and low-concentration wastewater treatment lines. For wastewater discharged due to accidents, there are corresponding emergency pools for recycling. The treatment process steps are as follows: First, high-concentration and low-concentration wastewater are transported via pipelines to the first equalization tank of the high-concentration wastewater treatment line and the second equalization tank of the low-concentration wastewater treatment line for temporary storage. The high-concentration wastewater temporarily stored in the first equalization tank undergoes primary treatment via an electrocoagulation flotation unit 1. Electrolytic oxidation reduces BOD5, COD, NH3-N, etc., in the original solution. During electrolytic reduction, high-valence or low-valence metal cations in the electrolyte gain electrons at the cathode and are directly reduced to low-valence cations or metal precipitates. Then, electrolytic flocculation occurs. When direct current is applied to the soluble anode, the anode loses electrons, forming metal cations. These cations react with OH- in the solution to form metal hydroxide colloidal flocculants, which have extremely strong adsorption capacity, adsorbing and co-precipitating pollutants in the wastewater for removal. As electrolysis continues, when the voltage reaches the decomposition voltage of water, hydrogen and oxygen are released at the cathode and anode, respectively. These small, highly dispersed bubbles act as carriers, adhering to suspended solids in the water and floating to the surface, thus easily removing pollutants. Electrolytic flotation can remove both hydrophobic and hydrophilic pollutants from wastewater. Through this process, insoluble organic matter is sludge formed, which is then scraped by the scraping mechanism 4 and temporarily stored in the sludge collection area 24. The resulting sludge is then transported to the first sludge tank for temporary storage. For low-concentration wastewater, it flows to a coagulation sedimentation tank for coagulation and sedimentation as primary treatment, and the resulting sediment is transported to the second sludge tank for temporary storage.

[0043] Secondly, the water from the high-concentration wastewater treatment line undergoing primary treatment flows to an electrolysis tank for secondary electrolysis. After electrolysis, it flows to the first sedimentation tank to settle any flocs not scraped by the scraping mechanism 4. The sediment is then transported to the first sludge tank. Meanwhile, the water from the low-concentration wastewater treatment line undergoing primary treatment flows to a second intermediate tank for temporary storage. A portion of the primary-treated water is then transported to an anaerobic tank for anaerobic degradation, undergoing secondary treatment. It should be noted that a dynamic membrane is installed in this anaerobic tank to form a controllable filter layer, thereby achieving separation, filtration, or purification of the sediment generated in the anaerobic tank. Next, the water that has settled in the first sedimentation tank for a certain period of time flows to the Fenton oxidation tank for electro-Fenton treatment. Electro-Fenton specifically involves the electrolytic reduction of the wastewater. During the electrolytic reduction process, hydrogen peroxide (H2O2) and free radicals (·OH) are generated, and new Fe2+ ions are continuously produced. The catalytic effect of hydrogen peroxide (H2O2) is not weakened, thus minimizing the amount of hydrogen peroxide (H2O2) added during the treatment process and reducing operating costs. A small amount of ferrous sulfate solution can be added during the reduction process to save water resources and reduce reagent costs. This allows for secondary treatment of the high-concentration wastewater after primary treatment to remove dissolved organic matter, thereby reducing the concentration of the high-concentration wastewater. After treatment, the wastewater flows to the second sedimentation tank for sedimentation. The sludge settled during this process is temporarily stored in the first sludge tank. The wastewater after sedimentation in the second sedimentation tank first flows to the first intermediate tank and then to the anaerobic tank for further treatment.

[0044] Furthermore, the wastewater that flows into the anaerobic tank, after treatment, flows into the A / O tank. In the anoxic tank (A tank), denitrification occurs, converting nitrate nitrogen into nitrogen gas which is released into the air, achieving biological nitrogen removal. The concentrations of organic matter and nitrate nitrogen in the anoxic tank are significantly reduced, specifically in terms of COD, nitrate nitrogen, and total nitrogen content. Phosphorus may also be absorbed or released in the anoxic tank. The wastewater then enters the aerobic tank (O tank), where its main functions are COD removal, nitrification, and phosphorus absorption. After sedimentation in the sedimentation tank, the supernatant is discharged. A portion of the sludge with high phosphorus content is returned to the anaerobic tank, while the remainder flows to the second sludge tank as excess sludge, achieving biological phosphorus removal. A dynamic membrane is also installed in the A / O tank. The treated wastewater then flows to the third sedimentation tank for further sedimentation, and the resulting sediment is temporarily stored in the second sludge tank. Finally, the wastewater in the third sedimentation tank is first flowed into the biological filter, where microorganisms on the biofilm adsorb and degrade organic pollutants in the wastewater, thereby purifying the wastewater. The purified water is first temporarily stored in a storage tank, and then flows into the ozone oxidation tank for further treatment before being discharged.

[0045] The combination of electrocoagulation-flotation unit 1 and electro-Fenton can remove most of the easily physicochemically separable substances through electrocoagulation-flotation, while reducing color and total nitrogen. This reduces the difficulty of the downstream Fenton process. Fenton utilizes the generated hydroxyl radicals to disrupt the stable molecular structure of organic matter, thereby improving biodegradability. The iron-carbon + Fenton technology utilizes the free energy reaction in water, but its efficiency is low, requiring the addition of more ferrous iron to promote the reaction. This results in a significant increase in sulfate ions, and high sulfate concentrations can affect the stable operation of the subsequent anaerobic system. Electro-Fenton, under the influence of a forced electric field, achieves better water treatment results, eliminating the need for ferrous sulfate addition, making the process cleaner and more environmentally friendly. It improves biodegradability without increasing sulfate concentration.

[0046] The dynamic membrane used is a membrane system based on microfiltration, ultrafiltration, nanofiltration, or reverse osmosis membranes. It forms a controllable filter membrane layer through physicochemical processes such as adsorption, coagulation, or deposition, thereby achieving separation, filtration, or purification. It also boasts advantages such as low cost, stable operation, and ease of cleaning.

[0047] Example 2: Reference Figure 5 The difference from Embodiment 1 is that, in this embodiment, the sliding track 51 specifically includes a sliding section 511 that slides as it abuts against the scraper 42, a vibrating section 512 disposed above or below the sliding section 511, and a connecting section 513 for connecting the sliding section 511 and the vibrating section 512. In this embodiment, the vibrating section 512 disposed below the sliding section 511 is specifically shown, and the vibrating section 512 is arranged in a wave shape in the direction close to the guide plate 26.

[0048] Furthermore, as the force of the return spring 54 on the cleaning plate decreases, if the fluctuation of the jittering segment 512 is constant, there is a possibility that the reset may not be completed. In this embodiment, it can be set as shown in the figure to gradually flatten the fluctuation of the jittering segment 512 away from the second slider 28. Furthermore, the distance between two adjacent peaks or troughs in the jittering segment 512 can be gradually increased away from the second slider 28.

[0049] Two connecting sections 513 are provided to form a closed loop of sliding track 51. A second sliding groove 27 is provided on the side wall of pool body 2. The second sliding groove 27 is located on the side of sliding track 51 away from guide plate 26. A second slider 28 is fixedly connected to the side wall of fixed plate 55. The second slider 28 is slidably connected to the second sliding groove 27 and slides along the height direction of the second sliding groove 27.

[0050] Reference Figure 6In this embodiment, a limiting member 6 is provided in the connecting section 513 to limit the first slider 52 from retracting. The limiting member 6 specifically includes a rotating rod 61 rotatably connected to the connecting section 513, a torsion spring 62 disposed between the rotating rod 61 and the connecting section 513, and a limiting rod 63 disposed on the rotating rod 61. The two ends of the torsion spring 62 are fixedly connected to the rotating rod 61 and the connecting section 513, respectively.

[0051] Example 3: Reference Figure 7 , Figure 8 The difference from Embodiment 1 is that a cavity 452 is provided inside the cleaning plate, and an air hole 453 communicating with the cavity 452 is provided on the surface of the cleaning plate near the scraper 42. A baffle 454 is provided on the side of the cleaning plate near the air hole 453 and the air blown from the air hole 453 is directed towards the cleaning plate. A connecting cavity 531 communicating with the cavity 452 is opened on the sliding rod 53. A piston rod 532 is slidably passed through the surface of the sliding rod 53 away from the cleaning plate. A connecting plate 29 is provided on the inner wall of the pool body 2. The end of the piston rod 532 away from the sliding rod 53 is connected to the connecting plate 29.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for treating pharmaceutical chemical industrial wastewater, characterized by: The system includes an electrocoagulation flotation machine (1), which includes a tank body (2), an aeration release mechanism (3) installed on the tank body (2) for aeration and release of dissolved air water, a scraping mechanism (4) for scraping scum, and a control mechanism electrically connected to each mechanism; the inner cavity of the tank body (2) is arranged along its length direction as a coagulation reaction zone (21), an aeration reaction zone (22), a flotation zone (23), and a scum collection zone (24); the coagulation reaction zone (21) is provided with a sewage input pipe; the aeration release mechanism (3) is located in the aeration reaction zone (22); the sewage input pipe is provided with a control valve electrically connected to the control mechanism; the scraping mechanism (4) is located above the flotation zone (23) and the scum collection zone (24); the scraping mechanism (4) includes an mounting plate (41), a scraper (42) slidably connected to the mounting plate (41), and a scraper for connecting the mounting plate (41) and the scraper (42). 1) Install a drive assembly (43) to drive the scraper (42) to scrape off scum, an adjustment track (44) for the scraper (42) to slide and change the scraping range, and a cleaning assembly (45) for cleaning the scum adhering to the scraper (42) into the scum collection area (24); a partition (25) is provided between the flotation area (23) and the scum collection area (24), and a guide plate (26) is provided on the side of the partition (25) near the flotation area (23) that is inclined downward; the adjustment track (44) includes, in sequence, a descending section (441) for driving the scraper (42) to descend, a translational section (442) for scraping off scum, and an ascending section (443) parallel to the guide plate (26) in the direction near the scum scraping area; the lower end of the scraper (42) is used to abut against the guide plate (26); the sewage level in the tank (2) is lower than the height of the upper end of the partition (25); The cleaning assembly (45) includes a cleaning plate abutting against the side wall of the scraper (42), which is used to clean the scum adhering to the scraper (42) when the scraper (42) rises along the rising section (443) of the adjusting track (44). The scraper (42) is provided in several parts. The cleaning plate is provided above the slag collection area (24). The cleaning plate is used to abut against the surface of the scraper (42) near the slag collection area (24). As the scraper (42) rises along the rising section (443) of the adjusting track (44), the cleaning plate slides along the length of the pool body (2) or slides downward at an inclination towards the slag collection area (24). The pool body (2) is provided with a reset component (5) for driving the cleaning plate to reset so as to scrape the scum on the next scraper (42). The reset assembly (5) includes a sliding track (51) disposed on the inner side wall of the pool body (2), a first slider (52) slidably connected to the sliding track (51), a slide rod (53) connected to the first slider (52) and the cleaning plate, a reset spring (54) coaxially sleeved on the slide rod (53), and a fixing plate (55) through which the slide rod (53) slides. The fixing plate (55) is fixed to the pool body (2), and the reset spring (54) is disposed between the cleaning plate and the fixing plate (55). The reset spring (54) forces the cleaning plate to move toward the scraper (42). The sliding track (51) includes a sliding section (511) that slides against the scraper (42), a vibrating section (512) disposed above or below the sliding section (511), and a connecting section (513) for connecting the sliding section (511) and the vibrating section (512). Two connecting sections (513) are provided so that the sliding track (51) forms a closed loop. The vibrating section (512) is wavy in the direction close to the guide plate (26). The pool body ( 2) The side wall is provided with a second slide groove (27). The second slide groove (27) is located on the side of the sliding track (51) away from the guide plate (26). The slide rod (53) slides through the second slider (28). The second slider (28) is slidably connected to the second slide groove (27). The second slider (28) slides along the height direction of the second slide groove (27). The connecting section (513) is provided with a limiting member (6) to restrict the first slider (52) from retracting.

2. The pharmaceutical chemical industry wastewater treatment device according to claim 1, characterized in that: The surface of the cleaning plate near the slag collection area (24) is provided with an arc surface (451), and the arc of the arc surface (451) is arranged in a direction away from the slag collection area (24).

3. The pharmaceutical and chemical industrial wastewater treatment device according to claim 1, characterized in that: The undulations of the jittering segment (512) gradually become gentler in the direction away from the second slider (28).

4. The pharmaceutical and chemical wastewater treatment device according to claim 1, characterized in that: The spacing between two adjacent peaks or troughs in the jittering segment (512) gradually increases in the direction away from the second slider (28).

5. The pharmaceutical and chemical wastewater treatment device according to claim 1, characterized in that: The cleaning plate has a cavity (452) inside. The surface of the cleaning plate near the scraper (42) has an air hole (453) communicating with the cavity (452). The cleaning plate has a baffle (454) on the side of the air hole (453) near the scraper (42). The air blown from the air hole (453) is directed toward the cleaning plate. The slide rod (53) has a connecting cavity (531) communicating with the cavity (452). The slide rod (53) slides through a piston rod (532) on the surface away from the cleaning plate. The inner wall of the pool body (2) has a connecting plate (29). The end of the piston rod (532) away from the slide rod (53) is connected to the connecting plate (29).

6. A pharmaceutical and chemical wastewater treatment process, applied to the pharmaceutical and chemical wastewater treatment device according to any one of claims 1-5, wherein the treatment is selected according to the wastewater concentration, including a high-concentration wastewater treatment line and a low-concentration wastewater treatment line, and the treatment process steps are as follows: First, high-concentration wastewater and low-concentration wastewater are transported through conveying pipes to the equalization tanks in the high-concentration wastewater treatment line and the low-concentration treatment line for temporary storage. High-concentration wastewater is first treated by electrocoagulation flotation machine (1) to remove insoluble organic matter into scum, which is then scraped by scraping mechanism (4). Low-concentration wastewater flows to coagulation sedimentation tank for coagulation and sedimentation for primary treatment. Secondly, the water from the high-concentration wastewater treatment line undergoing primary treatment is flowed to the first sedimentation tank to settle some of the flocs that were not scraped by the scraping mechanism (4); while the water from the low-concentration wastewater treatment line undergoing primary treatment is flowed to the anaerobic tank for anaerobic degradation for secondary treatment. A dynamic membrane is installed in the anaerobic tank to form a controllable filter membrane layer, thereby achieving separation, filtration or purification of the sediment generated in the anaerobic tank. Next, the water that has settled in the first sedimentation tank for a certain period of time flows to the Fenton oxidation tank for oxidation, so as to carry out secondary treatment of the high-concentration wastewater after primary treatment, so as to reduce the concentration of the high-concentration wastewater. After treatment, it flows to the second sedimentation tank for sedimentation. The sludge settled during this period flows to the first sludge tank for temporary storage. The wastewater after sedimentation in the second sedimentation tank flows to the anaerobic tank for treatment. Furthermore, the wastewater that flows into the anaerobic tank together is treated and then flows into the third sedimentation tank for sedimentation. The sludge that settles during this process flows into the second sludge tank for temporary storage. Finally, the wastewater in the third sedimentation tank is sequentially flowed into the biological filter and ozone oxidation tank for treatment before being discharged.

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