Sewage treatment system of refuse transfer station

Abstract

The utility model provides a sewage treatment system of a refuse transfer station, which comprises a sewage storage tank with a built-in filter grid; the oil removal tank is communicated with the sewage storage tank, sewage in the sewage storage tank is filtered by the filter grid and then enters the oil removal tank, and oil-water separation is carried out in the oil removal tank; the biochemical treatment box is communicated with the oil removal box, and a water layer separated in the oil removal box is conveyed to the biochemical treatment box to be in contact with aerobic bacteria in the biochemical treatment box so as to degrade organic matters; the flocculation basin is communicated with the biochemical treatment box, and the degraded sewage in the biochemical treatment box is conveyed to the flocculation basin for solid-liquid separation. Through multi-stage treatment such as filtration, oil-water separation, organic matter degradation and solid-liquid separation, grease, organic pollutants and suspended solids in sewage are effectively removed, so that the sewage treatment efficiency is improved, up-to-standard discharge is ensured, the pollution to the surrounding environment is reduced, and the environmental protection efficiency of the refuse transfer station is optimized.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to a sewage treatment system of a garbage transfer station. Background Art

[0002] Waste transfer stations are crucial hubs for urban waste collection and treatment, connecting waste generation sources with final disposal systems and forming an integral part of the municipal solid waste collection, transportation, and disposal system. At the collection station, solid waste undergoes initial compression before being transported to the waste transfer station, where it undergoes mechanical compression before being transported by garbage trucks to the final disposal system. Currently, my country's final disposal system primarily consists of landfills and waste-to-energy incineration. With the acceleration of my country's urbanization and the continuous improvement of residents' living standards, waste production is increasing year by year, making the construction of waste transfer stations particularly necessary.

[0003] However, landfill leachate has become one of the serious sources of pollution in waste transfer stations. The wastewater generated by transfer stations comes from a wide range of sources, with complex and diverse water quality, and its collection and treatment methods are also different. The wastewater of waste transfer stations mainly includes three categories: domestic sewage, flushing wastewater and landfill leachate. Specifically:

[0004] Domestic sewage: generated by the daily life and work of transfer station staff;

[0005] Washing wastewater: mainly comes from washing operations of the ground, vehicles and equipment;

[0006] Landfill leachate: Produced during the garbage compression process, it has the characteristics of high pollutant concentration, large changes in water quality, and a strong odor. It is often black or gray-brown.

[0007] Although the volume of leachate from waste transfer stations is relatively small, it is highly polluting. This is particularly true at many small and medium-sized waste transfer stations, where a lack of direct access to municipal pipe networks and effective on-site treatment technologies often results in inadequate leachate treatment and uncontrolled discharge. This not only deteriorates the sanitation of the transfer station and its surroundings but also creates significant fluctuations in the influent load of wastewater treatment plants, leading to ecological damage to the discharged water bodies and the spread of odors.

[0008] The technical routes for leachate treatment usually include biological treatment, physical and chemical treatment (physicochemical method) and comprehensive treatment methods. The basic process is as follows:

[0009] Pretreatment: adopt physical and chemical treatment such as ammonia stripping, coagulation and sedimentation;

[0010] Main treatment: biological method based on anaerobic treatment and aerobic treatment;

[0011] Advanced treatment: including physical and chemical means such as coagulation and sedimentation, filtration, adsorption, and membrane treatment;

[0012] Discharge: Final discharge of treated water that meets standards.

[0013] Leachate from waste transfer stations requires different treatment methods than leachate from landfills and incineration plants due to its high B / C ratio, biodegradability, low ammonia nitrogen content, and high suspended solids content. These characteristics mean that if wastewater from compacted waste (high in COD and suspended solids) is discharged directly into the municipal pipe network without treatment, it will severely impact municipal sewage treatment plants and cause suspended solids to accumulate in the sewage pipe network, complicating pipe network maintenance.

[0014] Therefore, in the sewage treatment of garbage transfer stations, especially in the leachate treatment, a safe and reliable treatment process must be selected. Especially when garbage transfer stations are usually close to residential areas, environmental protection and safety factors are particularly important.

[0015] However, the existing technology of wastewater treatment at garbage transfer stations faces the following key problems:

[0016] There are significant differences in the collection and treatment methods of sewage from different sources, making it difficult to treat it in a unified manner;

[0017] The lack of effective leachate treatment technology at small and medium-sized transfer stations leads to uncontrolled leachate discharge, polluting the environment and affecting public health;

[0018] High COD and suspended solids in landfill leachate will impact municipal pipe networks and sewage treatment plants, increasing the difficulty of subsequent treatment;

[0019] Landfill leachate is often accompanied by a strong stench. If not handled properly, it will affect the quality of life of surrounding residents.

[0020] It can be seen that the leachate treatment of garbage transfer stations currently faces many challenges, and there is an urgent need for more effective, environmentally friendly and practical treatment solutions. Especially when the sewage sources are complex, the leachate is highly polluted and the discharge is restricted, how to design a safe and efficient treatment system is the core issue that needs to be solved at present.

[0021] In view of this, the present utility model is proposed. Utility Model Content

[0022] The purpose of this utility model is to provide a wastewater treatment system for a waste transfer station, aiming to efficiently treat wastewater within the station. The system comprises a wastewater storage tank, an oil removal tank, a biochemical treatment tank, and a flocculation tank. Through multi-stage treatment, including filtration, oil-water separation, organic matter degradation, and solid-liquid separation, it effectively removes grease, organic pollutants, and suspended solids from the wastewater, thereby improving wastewater treatment efficiency, ensuring compliance with discharge standards, reducing pollution to the surrounding environment, and optimizing the environmental performance of the waste transfer station.

[0023] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0024] A sewage treatment system for a garbage transfer station, comprising:

[0025] Sewage storage tank with built-in filter grid;

[0026] The oil removal tank is connected to the sewage storage tank. The sewage in the sewage storage tank is filtered through the filter grid and then enters the oil removal tank, where oil and water are separated;

[0027] The biochemical treatment tank is connected to the oil removal tank. The water layer separated in the oil removal tank is transported to the biochemical treatment tank to contact with aerobic bacteria in the biochemical treatment tank to degrade organic matter.

[0028] The flocculation tank is connected to the biochemical treatment tank, and the degraded sewage in the biochemical treatment tank is transported to the flocculation tank for solid-liquid separation.

[0029] Furthermore, the filter grid is placed horizontally in the sewage storage tank, dividing the interior of the sewage storage tank into a pre-filtration area located below the filter grid and a post-filtration area located above the filter grid. The sewage in the pre-filtration area passes through the filter grid into the post-filtration area. The post-filtration area is connected to the oil removal tank, and the filtered sewage in the post-filtration area can be transported to the oil removal tank.

[0030] Furthermore, the post-filtration area is connected to the oil removal tank through a first connecting pipe. A lifting pump connected to the first connecting pipe is provided in the post-filtration area for pumping the filtered sewage to the oil removal tank through the first connecting pipe.

[0031] Furthermore, an oil collecting cone is provided in the oil removal tank, the liquid inlet of the oil collecting cone is connected to the sewage storage tank, and the sewage in the sewage storage tank directly enters the oil collecting cone through the liquid inlet for oil-water separation;

[0032] Alternatively, the liquid inlet of the oil collecting cone is connected to the cavity surrounded by the oil removal tank, the cavity of the oil removal tank is connected to the sewage storage tank, the sewage in the sewage storage tank first enters the oil removal tank cavity, and then enters the oil collecting cone through the liquid inlet of the oil removal tank cavity for oil and water separation.

[0033] Furthermore, the oil collecting cone is a cone structure that is wide at the top and narrow at the bottom and has a cavity inside. A liquid inlet and an oil discharge port connecting the inside and outside of the cavity are provided at the upper part of the cone structure, and a water outlet connecting the inside and outside of the cavity is provided at the lower part of the cone structure. Sewage enters the cavity through the liquid inlet. After the oil and water are separated, the oil layer is discharged from the oil discharge port and the water layer is discharged from the water outlet.

[0034] Furthermore, an oil collecting tank is provided outside the oil removal tank, and the oil discharge port of the oil collecting cone is connected to the oil collecting tank through a second connecting pipe. A valve body structure is provided on the second connecting pipe. When the valve body structure is opened, the oil layer in the oil collecting cone is discharged from the oil discharge port through the second connecting pipe to the oil collecting tank.

[0035] Furthermore, the oil collecting cone is arranged in the upper area of ​​the oil removal tank, and a micro-aeration generating device is arranged in the upper area of ​​the oil removal tank close to the oil collecting cone.

[0036] Furthermore, a mirror installation opening is provided on the side wall of the oil removal tank in the upper region thereof, and a mirror is installed on the mirror installation opening for observing the oil collecting cone in the oil removal tank.

[0037] Furthermore, a deoiling tank feed port for connecting to a sewage storage tank is provided on the upper portion of the deoiling tank, and the deoiling tank is provided with a guide plate extending downward from the deoiling tank feed port. The sewage enters the deoiling tank from the deoiling tank feed port and flows along the guide plate.

[0038] Furthermore, an inclined baffle is provided below the deoiling tank internal guide plate, one end of the inclined baffle is connected to the inner wall of the deoiling tank, and the other end is provided to extend downwardly and obliquely toward the inside of the deoiling tank.

[0039] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art.

[0040] In the utility model, the filter grid in the sewage storage tank can achieve preliminary filtration of the sewage, remove large particles of suspended matter, and reduce the burden of subsequent treatment; then, the sewage enters the oil removal tank for oil-water separation, effectively removing grease in the water and reducing the organic load in the sewage; then, the separated water layer is transported to the biochemical treatment tank, where aerobic bacteria are used to degrade organic matter, further reducing the concentration of organic pollutants in the sewage and improving the water quality; finally, the biochemically treated sewage enters the flocculation tank for solid-liquid separation and removal of remaining suspended matter, thereby achieving sewage purification.

[0041] The sewage treatment system of this utility model effectively improves the sewage treatment efficiency through multi-stage treatment steps, can ensure that the treated sewage meets the discharge standards, and reduces pollution to the environment. The system has a simple design and efficient operation, and is suitable for the sewage treatment needs of garbage transfer stations.

[0042] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0044] Figure 1 , is a schematic diagram of the assembly structure of the sewage treatment system of the garbage transfer station of the present utility model;

[0045] Figure 2 , is a schematic diagram of the assembly structure of the oil collecting cone in the oil removal tank in the sewage treatment system of the utility model.

[0046] In the picture:

[0047] 1. Sewage storage tank; 11. Filter grid; 12. Pre-filtration zone; 13. Post-filtration zone; 14. First connecting pipe; 15. Lifting pump; 2. Oil removal tank; 21. Oil collecting cone; 211. Liquid inlet of oil collecting cone; 212. Oil discharge port; 213. Water outlet; 22. Oil removal tank feed port; 23. Guide plate; 24. Inclined baffle; 3. Oil collecting tank; 31. Second connecting pipe; 32. Valve body structure; 4. Micro-aeration generator; 5. Sight glass; 6. Biochemical treatment tank; 7. Flocculation tank; 8. Slag collection tank.

[0048] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0051] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0052] like Figure 1 and Figure 2 As shown, this embodiment provides a wastewater treatment system for a garbage transfer station. This system achieves efficient purification of wastewater from the station through multi-stage treatment. The system effectively treats grease, organic matter, suspended solids, and other pollutants in the wastewater. The system includes a wastewater storage tank 1, an oil removal tank 2, a biochemical treatment tank 6, a flocculation tank 7, an oil collection tank 3, a slag collection tank 8, and related supporting equipment.

[0053] Wastewater from the waste transfer station first enters a wastewater storage tank 1, which contains a filter screen 11. This screen is used to intercept large suspended particles in the wastewater and prevent clogging of subsequent treatment units. After passing through filter screen 11, most of the suspended particles are removed. The preliminarily purified wastewater then flows out of the tank 1 and is transported to the oil removal tank 2 via a first connecting pipe 14.

[0054] In degreasing tank 2, the wastewater undergoes oil-water separation. Due to its lower density, the oil in the wastewater rises to the surface of the tank, forming an oil layer, while the water sinks to the bottom. Degreasing tank 2 physically separates the oil and water layers, effectively separating the oil and water layers. The separated water layer then enters biochemical treatment tank 6.

[0055] The water layer separated from oil removal tank 2 is transported to biochemical treatment tank 6 via first connecting pipe 14. Within biochemical treatment tank 6, the wastewater comes into contact with aerobic bacteria cultured there. These bacteria utilize the organic matter in the wastewater as nutrients, metabolizing and decomposing it, thereby significantly reducing the organic pollutants in the wastewater. Biochemical treatment significantly reduces the concentration of organic matter in the wastewater, further improving water quality.

[0056] After biochemical treatment, wastewater flows through pipes into flocculation tank 7. In flocculation tank 7, flocculants are added to the wastewater, causing fine suspended matter and other difficult-to-settle particles in the wastewater to aggregate into larger flocs. These flocs sink to the bottom of the tank by gravity, achieving mud-water separation. After flocculation and sedimentation, the upper layer of clear water can be further treated or discharged to meet standards, while the sludge deposited at the bottom of the tank is discharged through a sludge drainage system and enters the subsequent sludge treatment process.

[0057] The sewage treatment system of this application forms a complete sewage treatment process route by sequentially connecting a sewage storage tank 1, an oil removal tank 2, a biochemical treatment tank 6, and a flocculation tank 7. The sewage undergoes preliminary filtration, oil-water separation, organic matter degradation, and flocculation sedimentation, ultimately achieving sewage purification and ensuring that the treated water meets discharge standards.

[0058] As one implementation of this embodiment, a filter grid 11 is placed horizontally within the sewage storage tank 1, dividing the interior of the tank 1 into two areas: a pre-filtration zone 12 located below the filter grid 11, and a post-filtration zone 13 located above the filter grid 11. When sewage enters the pre-filtration zone 12, large particles of suspended matter are trapped by the filter grid 11. Only sewage that has undergone preliminary filtration can pass through the filter grid 11 and enter the post-filtration zone 13. This structural design ensures that large particles are effectively removed before entering subsequent treatment stages, reducing the load on subsequent equipment, preventing clogging, and extending the system's service life.

[0059] Furthermore, post-filtration zone 13 is connected to de-oiling tank 2 via a first connecting pipe 14. Sewage from post-filtration zone 13 is transported through first connecting pipe 14 to de-oiling tank 2 for oil-water separation. Because filtered sewage requires a certain level of pressure to be effectively transported to de-oiling tank 2, a lift pump 15 is installed within post-filtration zone 13. This lift pump, connected to first connecting pipe 14, pumps the filtered sewage to de-oiling tank 2.

[0060] As an implementation method of this embodiment, an oil collecting cone 21 is provided in the oil removal tank 2 for oil-water separation. The liquid inlet 211 of the oil collecting cone 21 is directly connected to the sewage storage tank 1. Through such a design, the sewage in the sewage storage tank 1 can directly enter the oil collecting cone 21 from the liquid inlet 211 without passing through the cavity of the oil removal tank 2. This method allows the sewage to directly enter the oil collecting cone 21 and quickly separate the oil and water. After the sewage stays in the oil collecting cone 21 for a period of time, the floating oil is effectively collected in the upper part of the oil collecting cone 21 by utilizing the density difference of the oil, and the water layer settles to the lower part, where the sewage undergoes preliminary oil-water separation.

[0061] In another design, the wastewater in wastewater storage tank 1 does not enter the oil collecting cone 21 directly, but instead enters the cavity of oil removal tank 2 through a pipeline. Oil removal tank 2 and wastewater storage tank 1 are connected by a pipeline. After the wastewater enters the cavity of oil removal tank 2, the guide plate 23 and inclined baffle 24 inside the cavity reduce the flow rate of the wastewater, increase its residence time, and initiate the initial oil-water separation.

[0062] After the initial separation in the chamber, the wastewater enters the oil collecting cone 21 through the oil collecting cone inlet 211 for further oil-water separation. The floating oil is discharged into the oil collecting tank 3 through the oil discharge port 212, while the separated water layer flows out through the water outlet 213 and enters the next treatment stage.

[0063] Furthermore, the oil collecting cone 21 is designed as a cone structure that is wide at the top and narrow at the bottom, with a cavity inside for oil-water separation. This design achieves an efficient oil-water separation process by utilizing the density difference between oil and water. A liquid inlet 211 and an oil outlet 212 are provided at the top of the oil collecting cone 21. The liquid inlet 211 is used to connect to the sewage storage tank 1 or the oil removal tank 2, allowing sewage to enter the cavity of the oil collecting cone 21 through the liquid inlet 211. Because the cone structure is wide at the top and narrow at the bottom, after sewage enters the cavity, the oil naturally floats to the top of the cavity due to its lower density than water, while the water settles to the bottom of the cavity.

[0064] The oil drain port 212 on the upper portion of the oil collecting cone 21 is used to drain any grease that rises. When grease accumulates to a certain level within the cavity, it is drained through a pipe through the drain port 212 into the oil collecting tank 3 for collection and storage. Grease collection is controlled by the valve structure 32, and the operator can monitor the grease level within the oil collecting cone 21 in real time through the sight glass 5, allowing timely draining.

[0065] A water outlet 213 is defined at the bottom of the oil collecting cone 21. This outlet 213 is connected to the interior of the cone and is primarily used to discharge the separated water layer. During the oil-water separation process within the cone 21, the water layer gradually settles to the bottom of the cone. The separated water is then discharged through outlet 213 and enters the next stage of the system, such as the biochemical treatment tank 6, for further organic matter degradation and purification.

[0066] The structural design of the oil collecting cone 21 of the present invention achieves efficient oil-water separation. The wide-upper-narrow-lower shape of the oil collecting cone 21 and the design of the internal cavity ensure that the process of oil floating up and the water layer settling is smoother. The oil is discharged through the upper oil outlet 212 and the water layer is discharged through the lower water outlet 213. The entire oil-water separation process is simple and efficient, which can greatly improve the separation effect of the system and reduce the load on subsequent processing units. This design not only ensures that the oil in the wastewater of the garbage transfer station is effectively separated, but also ensures the smooth further purification and treatment of the wastewater.

[0067] Furthermore, an oil collecting tank 3 is provided outside the oil removal tank 2 to store the grease separated from the oil collecting cone 21. The oil discharge port 212 of the oil collecting cone 21 is connected to the oil collecting tank 3 via a second connecting pipe 31. Through this pipe, the grease separated from the oil collecting cone 21 can be smoothly discharged and stored in the oil collecting tank 3.

[0068] To control grease discharge, a valve structure 32 is installed on the second connecting conduit 31. This valve structure 32 controls the flow of grease from the oil collecting cone 21 to the oil collecting tank 3. When a certain amount of grease accumulates within the cavity of the oil collecting cone 21, the operator can manually open the valve structure 32, observing through the sight glass 5 that the grease has reached the required discharge level. Once the valve structure 32 is opened, the grease in the oil collecting cone 21 flows smoothly from the oil drain port 212 through the second connecting conduit 31 into the oil collecting tank 3 for storage.

[0069] This utility model achieves efficient grease separation and discharge control by providing a second connecting conduit 31 and a valve structure 32 between the oil collecting cone 21 and the oil collecting tank 3. The operator can monitor the oil level through the sight glass 5 based on the accumulation of the oil layer and manually open the valve structure 32 to ensure smooth discharge of grease into the oil collecting tank 3. This design significantly improves the system's operational convenience and oil-water separation effectiveness, effectively preventing grease leakage while ensuring safe grease collection and enhancing the system's overall environmental benefits.

[0070] Furthermore, as one implementation of this embodiment, an oil collecting cone 21 is positioned in the upper region of the oil removal tank 2. After wastewater enters the oil removal tank 2, oil-water separation primarily occurs in the upper region. Because oil has a low density and tends to float in water, positioning the oil collecting cone 21 in the upper region of the oil removal tank 2 effectively collects the floating oil.

[0071] To further improve oil-water separation efficiency, a micro-aeration device 4 is installed in the upper area of ​​the oil removal tank 2, near the oil collection cone 21. This device generates tiny bubbles, enhancing the separation of oil from wastewater. When these bubbles encounter oil droplets in the water, the oil easily adheres to the bubbles and rises to the upper area of ​​the oil collection cone 21. This device accelerates the rise of oil and improves separation efficiency.

[0072] In this embodiment, after sewage enters the oil removal tank 2 through the pipe, the oil in the water gradually floats up due to its low density, while the water settles to the bottom. The oil floats to the upper area of ​​the oil removal tank 2 and gathers in the oil collecting cone 21 for further oil-water separation. The micro-aeration generating device 4 arranged near the oil collecting cone 21 further promotes the aggregation and floating process of the oil by releasing tiny bubbles into the water. The oil is more likely to gather in the upper area of ​​the oil collecting cone 21 and then be discharged into the oil collecting tank 3 through the oil discharge port 212. The water layer after micro-aeration treatment is discharged through the water outlet 213 and enters the subsequent treatment process, such as the biochemical treatment tank 6 for degradation of organic matter.

[0073] Furthermore, a de-oiling tank inlet 22 is provided at the top of the de-oiling tank 2, which is connected to the wastewater storage tank 1. Wastewater filtered by the filter mesh 11 enters the de-oiling tank 2 from the storage tank through the inlet 22. After entering the de-oiling tank 2 through the inlet 22, the wastewater flows directly toward the guide plate 23 inside the de-oiling tank 2.

[0074] Deflector plate 23 extends downward from the de-oiling tank inlet 22, forming an inclined flow path. The wastewater gradually flows downward along the surface of deflector plate 23. Deflector plate 23 controls the flow rate of the wastewater, preventing it from directly impacting the bottom of the de-oiling tank 2 upon entry. Instead, it diffuses slowly and steadily into the tank. This design not only effectively prolongs the wastewater's residence time in the de-oiling tank 2 but also enhances the oil-water separation process.

[0075] To further optimize the oil-water separation effect, an inclined baffle 24 is installed below the guide plate 23. The design of the inclined baffle 24 allows the sewage to continue flowing downward after passing through the guide plate 23, further reducing the kinetic energy of the water flow, extending the water flow path, and ensuring that the sewage can fully remain in the oil removal tank 2 for separation.

[0076] The utility model provides an inclined baffle 24 below the guide plate 23. The inclined baffle 24 is designed as a planar structure inclined downward, with one end fixedly connected to the inner wall of the oil removal tank 2, and the other end extending toward the interior of the tank and inclined downward. The main function of the inclined baffle 24 is to change the direction of water flow through collision, thereby further promoting the separation of oil and water. After the sewage enters the oil removal tank 2 through the feed port 22, it flows downward along the guide plate 23. After colliding with the inclined baffle 24, the water flow path is changed, further reducing the kinetic energy of the water flow, causing the oil droplets in the water to float up. Through multiple collisions with the inclined baffle 24, the oil droplets gradually condense and float to the upper area of ​​the oil removal tank 2.

[0077] In this utility model, the inclined baffle 24 directs the flow of wastewater and impacts the water multiple times, increasing the chances of oil droplet separation and making the oil-water separation process more efficient. The guide plate 23 controls the flow rate of the wastewater, while the inclined baffle 24 further enhances the separation effect, causing oil and fat to float rapidly, thereby improving the system's separation efficiency. This design significantly improves the efficiency of oil-water separation while ensuring effective wastewater treatment, making it suitable for a variety of complex wastewater treatment environments.

[0078] The water layer discharged from the oil removal tank 2 then flows through a pipeline into the biochemical treatment tank 6. Aerobic bacteria are cultured within the biochemical treatment tank 6, which degrades organic matter in the wastewater. Through metabolism, the aerobic bacteria break down organic pollutants in the wastewater into harmless substances, effectively treating the organic matter in the wastewater. This process helps remove pollutants such as ammonia nitrogen and total phosphorus from the wastewater.

[0079] The biochemically treated wastewater is lifted to the flocculation tank 7 by a lift pump 15. The wastewater first enters the primary reaction tank, where flocculants are added to combine with suspended solids in the water to form flocs. After the flocs settle, the wastewater enters the secondary reaction tank through a water hole at the bottom, where flocculants are added again to further remove suspended solids. After flocculation is complete, the flocs in the wastewater mix with water and enter the sedimentation tank for mud and water separation.

[0080] The sedimentation tank is equipped with an inclined pipe area to trap flocs and further promote mud-water separation. The supernatant after sedimentation flows through the overflow weir plate into the outflow channel for collection and ultimately into the clear water tank. After a short period of storage, it can be discharged to meet discharge standards or reused. The flocs and sludge separated in the sedimentation tank are discharged into the sludge collection tank 8 through the sludge discharge pipe. The sludge in the sludge collection tank 8 is transported to the plate and frame filter press by the sludge feed pump for dewatering. After filtration, the sludge forms a sludge cake, which is then processed or incinerated with other waste. The filtrate is returned to the deep flocculation process for further processing.

[0081] The system also includes a dosing system, which automatically adds the required flocculants, nutrients, and other chemicals to the flocculation tank 7 and biochemical treatment tank 6 to ensure optimal treatment results. The dosing system adjusts based on the actual water quality to ensure effective removal of organic matter and suspended solids from the wastewater.

[0082] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A sewage treatment system for a garbage transfer station, characterized by: include: Sewage storage tank with built-in filter grid; The oil removal tank is connected to the sewage storage tank. The sewage in the sewage storage tank is filtered through the filter grid and then enters the oil removal tank, where oil and water are separated; The biochemical treatment tank is connected to the oil removal tank. The water layer separated in the oil removal tank is transported to the biochemical treatment tank to contact with aerobic bacteria in the biochemical treatment tank to degrade organic matter. The flocculation tank is connected to the biochemical treatment tank, and the degraded sewage in the biochemical treatment tank is transported to the flocculation tank for solid-liquid separation; The oil removal tank is provided with an oil collecting cone, the liquid inlet of the oil collecting cone is connected to the sewage storage tank, and the sewage in the sewage storage tank directly enters the oil collecting cone through the liquid inlet for oil-water separation; Alternatively, the liquid inlet of the oil collecting cone is connected to the cavity surrounded by the oil removal tank, the cavity of the oil removal tank is connected to the sewage storage tank, the sewage in the sewage storage tank first enters the oil removal tank cavity, and then enters the oil collecting cone through the liquid inlet from the oil removal tank cavity for oil and water separation; The oil collecting cone is a cone structure that is wide at the top and narrow at the bottom and has a cavity inside. A liquid inlet and an oil discharge port connecting the inside and outside of the cavity are provided at the upper part of the cone structure, and a water outlet connecting the inside and outside of the cavity is provided at the lower part of the cone structure. Sewage enters the cavity through the liquid inlet. After the oil and water are separated, the oil layer is discharged from the oil discharge port and the water layer is discharged from the water outlet.

2. The sewage treatment system of a garbage transfer station according to claim 1, characterized in that: The filter grid is placed horizontally in the sewage storage tank, dividing the interior of the sewage storage tank into a pre-filtration area located below the filter grid and a post-filtration area located above the filter grid. The sewage in the pre-filtration area passes through the filter grid into the post-filtration area. The post-filtration area is connected to the oil removal tank, and the filtered sewage in the post-filtration area can be transported to the oil removal tank.

3. The sewage treatment system of a garbage transfer station according to claim 2, characterized in that: The post-filtration area is connected to the oil removal tank through a first connecting pipe. A lifting pump connected to the first connecting pipe is provided in the post-filtration area for pumping the filtered sewage to the oil removal tank through the first connecting pipe.

4. The sewage treatment system of a garbage transfer station according to claim 1, characterized in that: An oil collecting tank is provided outside the oil removal tank, and the oil discharge port of the oil collecting cone is connected to the oil collecting tank through a second connecting pipe. A valve body structure is provided on the second connecting pipe. When the valve body structure is opened, the oil layer in the oil collecting cone is discharged from the oil discharge port through the second connecting pipe to the oil collecting tank.

5. The sewage treatment system of a garbage transfer station according to claim 1, characterized in that: The oil collecting cone is arranged in the upper area of ​​the oil removal tank, and a micro-aeration generating device is arranged in the upper area of ​​the oil removal tank close to the oil collecting cone.

6. The sewage treatment system of a garbage transfer station according to claim 5, characterized in that: A sight glass installation opening is provided on the side wall of the oil removal tank in the upper area, and a sight glass is installed on the sight glass installation opening for observing the oil collecting cone in the oil removal tank.

7. The sewage treatment system of a garbage transfer station according to claim 1, characterized in that: The deoiling tank is provided with a deoiling tank feed port for communicating with the sewage storage tank at the top. The deoiling tank is provided with a guide plate extending downward from the deoiling tank feed port. The sewage enters the deoiling tank from the deoiling tank feed port and flows along the guide plate.

8. The sewage treatment system of a garbage transfer station according to claim 7, characterized in that: An inclined baffle is provided below the deoiling tank internal guide plate, one end of the inclined baffle is connected to the inner side wall of the deoiling tank, and the other end is extended downwardly and inclined toward the inside of the deoiling tank.

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