Biochemical sewage pretreatment device

Abstract

This utility model discloses a biochemical wastewater pretreatment device, aiming to solve the problems of mixed old and new wastewater treatment ratios, medical waste damaging equipment, and gaps in filtration and cleaning in existing biochemical wastewater pretreatment processes. The technical solution includes a tank body, internally divided into a storage tank, a holding tank I, a temporary storage tank, a holding tank II, and a treatment tank. A discharge pipe and an inlet pipe are respectively provided on both sides of the tank body, with a valve installed on the discharge pipe. Both the temporary storage tank and the treatment tank are equipped with a stirrer. The inner wall of the temporary storage tank is equipped with filter elements, including a main frame plate, a secondary frame plate, and a sieve cage. The inner wall of the temporary storage tank is provided with a frame and a sliding frame. The main frame plate slides onto the sliding frame, and the secondary frame plate slides onto the main frame plate. The main frame plate has through holes and a sieve. The sieve cage is connected to the secondary frame plate. This allows for wastewater filtration, sedimentation prevention, quantitative mixing and disinfection, ensuring continuous pretreatment. It is used for the pretreatment of biochemical wastewater from medical institutions and medical biological research institutions before discharge to hospital and research institution wastewater treatment plants.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater pretreatment equipment, and in particular to a biochemical wastewater pretreatment equipment. Background Technology

[0002] Hospitals and medical biological research institutions generate biochemical wastewater. This type of wastewater needs to be pretreated before entering the hospital or research institution's wastewater treatment plant for further treatment. According to GB18466-2016 "Standard for Discharge of Water Pollutants from Medical Institutions", various special wastewaters from medical institutions should be collected and treated separately, and discharged into the hospital wastewater treatment system only after meeting the standards. At the same time, H2029-2013 "Technical Specifications for Hospital Wastewater Treatment" clearly states that chromium-containing wastewater must be treated by chemical reduction precipitation to ensure that the concentration of hexavalent chromium in the treated water is less than 0.5 mg / L before entering the subsequent treatment system.

[0003] According to self-inspection by hospitals and research institutions, the wastewater generated by current medical and research centers, due to the use of new technologies and materials, does not currently contain the aforementioned chromium pollutants. Only collection, storage, and disinfection are required. However, preparations must be made for subsequent pollutant treatment after adjustments to processes and materials. Current treatment methods primarily involve automatically metering and adding sodium hypochlorite after collecting biochemical wastewater, followed by a 2-hour contact period to kill biochemically active substances before automatic discharge to the hospital's wastewater treatment plant. This process has several drawbacks: First, it cannot force medical staff to stop using the water tanks. Continuing to pour wastewater into the treatment system will cause mixing of old and new wastewater, disrupting the original sodium hypochlorite-to-wastewater treatment ratio and affecting disinfection effectiveness. Second, medical waste may be mixed into the wastewater due to improper operation. This waste entering the treatment tank can damage internal pumps, agitators, and other equipment, and may even cause pipe blockages. Third, the existing filtration structure is simplistic, resulting in processing gaps when cleaning filter components, failing to continuously guarantee wastewater filtration effectiveness and affecting the continuity of pretreatment. Utility Model Content

[0004] The purpose of this utility model is to solve the shortcomings of existing technologies, such as the mixing and destruction of new and old wastewater, damage to equipment by medical waste, and gaps in filtration and cleaning, and proposes a biochemical wastewater pretreatment device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A biochemical wastewater pretreatment device includes a tank body, the tank body being internally divided into a storage tank, a storage tank I, a temporary storage tank, a storage tank II, and a treatment tank. A discharge pipe and a liquid inlet pipe are respectively provided on both sides of the tank body. The discharge pipe is sealed and connected to the treatment tank and is equipped with a valve. The liquid inlet pipe is sealed and connected to the temporary storage tank. At least two agitators are fixedly installed inside the temporary storage tank and the treatment tank, respectively. A filter element is fixedly installed on the inner wall of the temporary storage tank and corresponds to the outlet end of the inlet pipe. The filter element includes a main frame plate, a secondary frame plate, and a sieve cage. A frame and a sliding frame are fixedly provided on the inner wall of the temporary storage tank. The main frame plate is slidably sleeved on the outer wall of the sliding frame and can move along its axial direction. The secondary frame plate is slidably disposed on the side wall of the main frame plate. The surface of the main frame plate is provided with through holes and a sieve. The sieve is located below the through holes. The sieve cage is fixedly disposed below the secondary frame plate and corresponds to the through holes and the inlet pipe. In this process, when the biochemical wastewater enters through the inlet pipe, it is first filtered through a screen cage to remove foreign matter. The stirrer in the temporary storage tank continuously stirs the wastewater to prevent sedimentation, and the stirrer in the treatment tank can mix the wastewater with the disinfectant to achieve disinfection.

[0006] In one possible design, both the main frame plate and the auxiliary frame plate are provided with lifting holes, and the bottom wall of the through hole and the bottom wall of the inlet end of the screen cage are provided with inclined guide surfaces.

[0007] In one possible design, a liquid level pipe is fixedly provided on the outer wall of the pool, and the liquid level pipe is in sealed communication with the liquid storage pool. The liquid level tube allows for external observation of the liquid volume inside the storage tank, facilitating timely replenishment of disinfectant.

[0008] In one possible design, the storage tank contains sodium hypochlorite; Sodium hypochlorite, as a disinfectant, can be mixed with wastewater in the treatment tank to kill biochemically active substances in the wastewater, ensuring that the pre-treated wastewater meets the discharge standards of medical institutions.

[0009] In one possible design, a level gauge is fixedly installed inside the temporary storage tank; Among them, the level gauge can detect the sewage volume in the temporary storage tank in real time. When the sewage reaches the specified volume, it can trigger the subsequent quantitative transportation process to prevent new sewage from entering and disrupting the treatment ratio.

[0010] In one possible design, a pump is also included, which is fixedly installed inside the storage tank II. The input end of the pump is sealed to the temporary storage tank via a pipe, and the output end is sealed to the treatment tank via a pipe. The pump can quantitatively transport a specified amount of wastewater from the temporary storage tank to the treatment tank, ensuring a precise reaction ratio between the wastewater and sodium hypochlorite.

[0011] In one possible design, a metering pump is also included, which is fixedly installed inside the storage tank I. The input end of the metering pump is sealed to the storage tank via a pipe, and the output end is sealed to the treatment tank via a pipe. The metering pump can extract a specified amount of sodium hypochlorite from the storage tank and transport it to the treatment tank. In conjunction with the pump, it can achieve quantitative mixing of sewage and sodium hypochlorite, ensuring stable disinfection effect.

[0012] In this application, during actual use, the biochemical wastewater generated by the medical and scientific research center is discharged into the interior of the temporary storage tank through the inlet pipe. When the wastewater in the temporary storage tank reaches the specified capacity (which can be achieved by installing a level gauge), the pump is driven to pump the specified amount of wastewater into the interior of the treatment tank. At the same time, the metering pump is driven to extract the specified amount of sodium hypochlorite from the storage tank into the treatment tank. Then, the wastewater is mixed by stirring with a stirrer to disinfect it. After the treatment is completed, it is discharged into the hospital's wastewater treatment plant through the discharge pipe to ensure that the wastewater and sodium hypochlorite are both in the specified amounts, thereby ensuring the ratio between the two and preventing new wastewater from entering during the treatment process and disrupting the original ratio. When biochemical wastewater enters the temporary storage tank through the inlet pipe, it will be screened by a screen cage to prevent larger foreign objects from entering the tank and damaging the pump and agitator. The foreign objects will fall into the inside of the screen cage, while the wastewater passes through normally. When cleaning the filter components regularly, the corresponding top cover is opened, and then the cleaning personnel lift the main frame plate and the auxiliary frame plate together until the main frame plate moves to the top of the outer wall of the sliding frame. The screen will be temporarily located on one side of the inlet pipe, directly isolating the foreign objects directly in the inlet pipe. Then, the auxiliary frame plate is pulled out along the sliding groove on the side wall of the main frame plate, and the foreign objects inside the screen cage are emptied for cleaning. After that, the auxiliary frame plate is inserted back into its original position along the sliding groove on the side wall of the main frame plate, and the main frame plate and the auxiliary frame plate are slid down to their original positions, so that the screen cage moves down to one side of the inlet pipe for filtration. In this utility model, when cleaning the filter components of the biochemical wastewater pretreatment equipment, the screen can temporarily isolate foreign objects in the inlet pipe after the main frame plate is moved up, without stopping the wastewater introduction, avoiding the occurrence of a processing gap, ensuring the continuous biochemical wastewater pretreatment process, and meeting the treatment needs of the hospital's continuous wastewater generation. In this utility model, the agitator in the temporary storage tank of the biochemical wastewater pretreatment equipment is continuously running, which can effectively reduce the sedimentation of solid particles in the biochemical wastewater, ensure the uniformity of wastewater composition, facilitate subsequent quantitative transportation, and enable the wastewater and sodium hypochlorite to mix more thoroughly in the treatment tank, thereby improving disinfection efficiency and effect. In this invention, the quantitative delivery of wastewater and sodium hypochlorite is achieved during use, preventing new wastewater from entering the treatment tank and disrupting the original ratio. This ensures that the sodium hypochlorite and wastewater always maintain the optimal reaction ratio, resulting in stable and compliant disinfection. The filter element's screen cage filters large foreign objects before wastewater enters the temporary storage tank, preventing them from entering the tank and damaging the pump and agitator. It also prevents foreign objects from clogging the pipes, extending the equipment's service life and reducing maintenance costs and failure rate. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of the biochemical wastewater pretreatment equipment proposed in this utility model; Figure 2This is a schematic diagram of the biochemical wastewater pretreatment equipment proposed in this utility model from another perspective. Figure 3 This is an exploded structural diagram of the filter element of the biochemical wastewater pretreatment equipment proposed in this utility model; Figure 4 This utility model Figure 3 Enlarged view of the structure of section A; Figure 5 This is a top view schematic diagram of the biochemical wastewater pretreatment equipment proposed in this utility model; Figure 6 This is a front view schematic diagram of the biochemical wastewater pretreatment equipment proposed in this utility model; Figure 7 This is a side view of the biochemical wastewater pretreatment equipment proposed in this utility model. Figure 8 A simplified structural diagram of the biochemical wastewater pretreatment equipment proposed in this utility model with an added top cover.

[0014] In the diagram: 1. Tank body; 111. Storage tank; 112. Storage tank I; 113. Temporary storage tank; 114. Storage tank II; 115. Treatment tank; 116. Discharge pipe; 117. Liquid level pipe; 118. Inlet pipe; 2. Filter element; 211. Main frame plate; 212. Through hole; 213. Inclined guide surface; 214. Screen; 215. Screen cage; 216. Secondary frame plate; 217. Lifting hole; 218. Sliding frame; 3. Metering pump; 4. Agitator; 5. Pump; 6. Frame. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] In one embodiment: Reference Figure 1-2 The pretreatment equipment includes: tank 1, agitator 4, filter element 2, metering pump 3 and pump 5.

[0017] The interior of pool 1 is divided into five functional areas: storage pool 111, storage pool I 112, temporary storage pool 113, storage pool II 114, and treatment pool 115. A discharge pipe 116 and an inlet pipe 118 are respectively installed on both sides of pool 1. The discharge pipe 116 is connected to the treatment pool 115 and is used to discharge pre-treated sewage. A valve is installed on the discharge pipe 116 to control the timing of discharge. The inlet pipe 118 is connected to the temporary storage pool 113 and is used to introduce biochemical sewage generated by the reproductive center into the equipment. A liquid level pipe 117 is also installed on the outer wall of pool 1. The liquid level pipe 117 is connected to the storage pool 111. Staff can directly observe the volume of sodium hypochlorite inside the storage pool 111 from the outside through the liquid level pipe 117 for timely replenishment. The storage pool 111 can also be equipped with a separate replenishment pipe.

[0018] At least two agitators 4 are provided, installed inside the temporary storage tank 113 and the treatment tank 115 respectively. The agitator 4 in the temporary storage tank 113 is used to reduce sewage sedimentation, and the agitator 4 in the treatment tank 115 is used to mix sewage with sodium hypochlorite.

[0019] refer to Figure 3 The filter element 2 is installed on the side wall of the temporary storage tank 113 and corresponds to the position of the inlet pipe 118. It is used to filter large foreign objects in the sewage. The inner side wall of the temporary storage tank 113 is fixedly provided with a frame 6 and a sliding frame 218. The main frame plate 211 of the filter element 2 is slidably sleeved on the outer wall of the sliding frame 218 and can move up and down along the sliding frame 218. The secondary frame plate 216 is slidably set on the side wall of the main frame plate 211 and can be pulled out of the main frame plate 211. The surface of the main frame plate 211 has through holes 212 and a screen is fixedly installed thereon. 214. The screen 214 is located below the through hole 212. A screen cage 215 is fixedly installed below the sub-frame plate 216. The screen cage 215 corresponds to the through hole 212 and the inlet pipe 118 to ensure that the sewage can be filtered by the screen cage 215 after entering from the inlet pipe 118. Lifting holes 217 are provided on the main frame plate 211 and the sub-frame plate 216 to facilitate the lifting of the parts by the staff. The bottom wall of the through hole 212 and the bottom wall of the inlet end of the screen cage 215 are provided with inclined guide surfaces 213 to guide the sewage to pass smoothly through the filtration structure.

[0020] Pump 5 is installed inside storage tank II 114. The input end of pump 5 is connected to temporary storage tank 113, and the output end is connected to treatment tank 115. It is used to quantitatively transport sewage in temporary storage tank 113 to treatment tank 115.

[0021] Metering pump 3 is installed inside storage tank I 112. The input end of metering pump 3 is connected to storage tank 111, and the output end is connected to treatment tank 115. It is used to quantitatively transport sodium hypochlorite in storage tank 111 to treatment tank 115.

[0022] This equipment also includes a controller (such as a PLC or a microcontroller). The controller is electrically connected to the level gauge, the agitator 4, the pump 5, and the metering pump 3. The controller has preset control logic. When the level gauge detects that the sewage in the temporary storage tank 113 has reached the specified capacity, it sends a signal to the controller. The controller synchronously starts the pump 5 and the metering pump 3 to quantitatively deliver sewage and sodium hypochlorite. At the same time, the agitator 4 in the temporary storage tank 113 is kept running continuously. The agitator 4 in the treatment tank 115 starts for a preset time after the pump and the metering pump stop to complete the mixing and disinfection.

[0023] In addition, a top cover is provided on the top of the pool body 1. The top cover above the frame 6 is set separately, which makes it convenient for staff to open and clean the filter element 2. When the separate top cover is closed on the frame 6, it will press the main frame plate 211 and the secondary frame plate 216 to ensure the stability of the filter element 2 during operation.

[0024] Biochemical wastewater generated by the reproductive center is discharged into the temporary storage tank 113 through the inlet pipe 118. When the wastewater enters, it first passes through the screen cage 215. The screen cage 215 screens out larger foreign objects in the wastewater to prevent foreign objects from entering the temporary storage tank 113 and damaging the pump 5 and the agitator 4. The foreign objects will remain in the screen cage 215, and the wastewater will enter the temporary storage tank 113 through the screen cage 215. The agitator 4 in the temporary storage tank 113 is continuously running to stir the wastewater in the tank and reduce the sedimentation of solid particles in the biochemical wastewater.

[0025] Once the wastewater in the temporary storage tank 113 reaches the designated capacity, pump 5 is started, pump 5 pumps the designated amount of wastewater from the temporary storage tank 113 to the treatment tank 115. At the same time, metering pump 3 is started, metering pump 3 extracts the designated amount of sodium hypochlorite from the storage tank 111 and delivers it to the treatment tank 115. Then, agitator 4 in the treatment tank 115 is started, agitator 4 drives the wastewater and sodium hypochlorite to mix thoroughly, disinfecting the wastewater and ensuring that the disinfection effect meets the standards. After the disinfection treatment is completed, the valve on the discharge pipe 116 is opened, and the pre-treated wastewater is discharged to the hospital wastewater treatment plant through the discharge pipe 116 for further deep treatment.

[0026] When cleaning the filter element 2 regularly, first open the separate top cover above the frame 6. The worker lifts the main frame plate 211 and the auxiliary frame plate 216 together through the lifting hole 217 until the main frame plate 211 moves to the top position of the outer wall of the sliding frame 218. At this time, the screen 214 on the main frame plate 211 will be temporarily located on the side of the liquid inlet pipe 118, temporarily isolating any foreign objects that may remain in the liquid inlet pipe 118, and preventing foreign objects from entering the temporary storage tank 113 during the cleaning process. Then, the auxiliary frame plate 216 is pulled out separately along the sliding groove on the side wall of the main frame plate 211, and the foreign objects in the screen cage 215 are poured out and cleaned. After cleaning, the auxiliary frame plate 216 is inserted back into its original position along the sliding groove on the side wall of the main frame plate 211. Then, the main frame plate 211 and the auxiliary frame plate 216 are slid down along the sliding frame 218 to the initial position, so that the screen cage 215 returns to the side of the liquid inlet pipe 118 to continue filtering. Finally, the separate top cover above the frame 6 is closed to complete the cleaning operation.

[0027] This application can be used in the field of pretreatment equipment for biochemical wastewater in medical institutions, or in other fields applicable to this application.

[0028] In another embodiment: a biochemical wastewater pretreatment device, which is applied to the field of biochemical wastewater pretreatment equipment in medical institutions. The structure of this embodiment is basically the same as the aforementioned embodiment, except that: a level gauge is installed inside the temporary storage tank 113 to detect the volume of wastewater in the temporary storage tank 113. When the wastewater reaches the specified volume, it enters the next processing step.

[0029] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A biochemical wastewater pretreatment device, characterized in that, include: The pool body (1) is divided into a storage pool (111), a storage pool I (112), a temporary storage pool (113), a storage pool II (114) and a treatment pool (115). The pool body (1) is provided with a discharge pipe (116) and a liquid inlet pipe (118) on both sides. The discharge pipe (116) is sealed and connected to the treatment pool (115) and is equipped with a valve. The liquid inlet pipe (118) is sealed and connected to the temporary storage pool (113). At least two agitators (4) are fixedly installed inside the temporary storage tank (113) and the treatment tank (115), respectively; The filter element (2) is fixedly installed on the inner wall of the temporary storage tank (113) and corresponds to the outlet end of the liquid inlet pipe (118). The filter element (2) includes a main frame plate (211), a secondary frame plate (216) and a sieve cage (215). The inner wall of the temporary storage tank (113) is fixedly provided with a frame (6) and a sliding frame (218). The main frame plate (211) is slidably sleeved on the outer wall of the sliding frame (218) and can move along its axial direction. The secondary frame plate (216) is slidably disposed on the side wall of the main frame plate (211). The surface of the main frame plate (211) is provided with a through hole (212) and a sieve (214). The sieve (214) is located below the through hole (212). The sieve cage (215) is fixedly disposed below the secondary frame plate (216) and corresponds to the through hole (212) and the liquid inlet pipe (118). When the biochemical wastewater enters through the inlet pipe (118), it first passes through the screen cage (215) to filter out foreign objects. The stirrer (4) in the temporary storage tank (113) continuously stirs to prevent sedimentation. The stirrer (4) in the treatment tank (115) can mix the wastewater with the disinfectant to achieve disinfection.

2. The biochemical wastewater pretreatment equipment according to claim 1, characterized in that, Both the main frame plate (211) and the secondary frame plate (216) are provided with lifting holes (217), and the bottom wall of the through hole (212) and the bottom wall of the inlet end of the screen cage (215) are provided with inclined guide surfaces (213).

3. The biochemical wastewater pretreatment equipment according to claim 2, characterized in that, A liquid level pipe (117) is fixedly provided on the outer wall of the pool body (1), and the liquid level pipe (117) is sealed and connected to the storage pool (111); The liquid level tube (117) allows the liquid volume inside the storage tank (111) to be observed from the outside, facilitating timely replenishment of disinfectant.

4. The biochemical wastewater pretreatment equipment according to claim 3, characterized in that, The storage tank (111) contains sodium hypochlorite; Sodium hypochlorite, as a disinfectant, can be mixed with the sewage in the treatment tank (115) to kill biochemical active substances in the sewage, ensuring that the pretreated sewage meets the discharge standards of medical institutions.

5. The biochemical wastewater pretreatment equipment according to claim 4, characterized in that, A level gauge is fixedly installed inside the temporary storage tank (113); Among them, the level gauge can detect the sewage capacity in the temporary storage tank (113) in real time. When the sewage reaches the specified capacity, it can trigger the subsequent quantitative transportation process to prevent new sewage from entering and disrupting the treatment ratio.

6. The biochemical wastewater pretreatment equipment according to claim 5, characterized in that, It also includes a pump (5), which is fixedly installed inside the storage tank II (114). The input end of the pump (5) is sealed to the temporary storage tank (113) through a pipe, and the output end is sealed to the treatment tank (115) through a pipe. The pump (5) can quantitatively transport a specified amount of sewage from the temporary storage tank (113) to the treatment tank (115) to ensure the accurate reaction ratio of sewage and sodium hypochlorite.

7. The biochemical wastewater pretreatment equipment according to any one of claims 1 to 6, characterized in that, It also includes a metering pump (3), which is fixedly installed inside the storage tank I (112). The input end of the metering pump (3) is sealed and connected to the storage tank (111) through a pipe, and the output end is sealed and connected to the treatment tank (115) through a pipe. The metering pump (3) can extract a specified amount of sodium hypochlorite from the storage tank (111) and transport it to the treatment tank (115). It works in conjunction with the pump (5) to achieve quantitative mixing of sewage and sodium hypochlorite, ensuring stable disinfection effect.

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