A wastewater purification device for highway service areas

Abstract

This utility model proposes a wastewater purification device for highway service areas, relating to the field of wastewater purification technology. The wastewater purification device includes: a toilet wastewater treatment structure, comprising a toilet wastewater equalization tank, an A / O biological treatment tank, and a filtration and disinfection unit; a catering wastewater treatment structure, comprising a catering wastewater equalization tank, an air flotation oil removal unit, and an grease recovery unit, wherein the air flotation oil removal unit is connected to the catering wastewater equalization tank, the grease recovery unit is connected to the air flotation oil removal unit, and the wastewater outlet of the air flotation oil removal unit is connected to the A / O biological treatment tank; and a car wash wastewater treatment structure, comprising a car wash wastewater equalization tank, a magnetic coagulation sedimentation unit, a membrane distillation unit, and a sludge treatment unit, wherein the inlet of the magnetic coagulation sedimentation unit is connected to the car wash wastewater equalization tank, and the magnetic coagulation sedimentation unit is simultaneously connected to the membrane distillation unit and the sludge treatment unit. This application achieves classified treatment, and the targeted process solves problems such as pollutant interference, equipment wear and tear, and overload during mixed treatment.

Description

Technical Field

[0001] This utility model relates to the field of wastewater purification technology, and more specifically, to a wastewater purification device for highway service areas. Background Technology

[0002] Wastewater from highway service areas is mainly divided into three categories. The first is toilet drainage, which contains a large amount of human excrement, toilet paper and detergent residue, and is rich in pollutants such as nitrogen, phosphorus, organic matter and bacteria. The second is catering wastewater, which mainly comes from the cooking and cleaning processes in the service area restaurants. It contains animal and vegetable oils, food scraps and detergents, which can easily cause pipe blockages and lead to eutrophication of water bodies if discharged without treatment. The third is car wash wastewater, which contains pollutants such as mud, detergents and oil. The chemical components in detergents may pollute the soil and groundwater, while oil can damage the surrounding ecological environment.

[0003] Properly treating wastewater from highway service areas is of great significance. On the one hand, if this wastewater is discharged directly without treatment, it will pollute the surrounding soil, surface water, and groundwater, disrupt the ecological balance, affect the living environment of animals and plants, and even threaten human health through the food chain. On the other hand, effectively treating service area wastewater can achieve the recycling of water resources. For example, treated wastewater can be used for greening irrigation and road washing, saving water resources and reducing the operating costs of service areas. In addition, standardized wastewater treatment also helps to improve the image of service areas, meets the requirements of green transportation and sustainable development, and plays an important role in promoting the construction of eco-friendly transportation.

[0004] Wastewater treatment equipment can treat wastewater from highway service areas. It typically consists of a screen, grit chamber, equalization tank, biological treatment unit (such as activated sludge or biofilm processes), sedimentation tank, and disinfection tank. Its principle is as follows: the screen intercepts larger floating and suspended solids in the wastewater; the grit chamber removes inorganic particles; the equalization tank equalizes the water quality and quantity; the biological treatment unit decomposes organic pollutants in the wastewater through the metabolic activity of microorganisms; the sedimentation tank separates the activated sludge or biofilm from the treated water; and finally, the disinfection tank kills harmful bacteria, ensuring the treated water meets discharge standards or reuse requirements, thus achieving wastewater purification.

[0005] Combining toilet wastewater, restaurant wastewater, and car wash wastewater into a single system presents several challenges. The diverse composition of pollutants in these wastewater types leads to several issues. Restaurant wastewater, with its high concentration of grease, tends to accumulate on equipment walls, causing blockages and inhibiting microbial activity in biological treatment units. Car wash wastewater, containing silt, accelerates equipment wear, and its untreated grease can interfere with the biological treatment process. Toilet wastewater, with its high organic matter concentration, can easily exceed the system's capacity when mixed with the other two types. Furthermore, different types of wastewater require different treatment focuses: restaurant wastewater requires enhanced grease separation, car wash wastewater needs efficient removal of suspended solids, and toilet wastewater requires emphasis on organic matter degradation. A single system cannot accurately adapt to all process parameters, leading to low treatment efficiency, substandard effluent quality, and significant system load fluctuations, increasing operating costs and maintenance complexity. Utility Model Content

[0006] The purpose of this utility model is to provide a sewage purification device for highway service areas, which aims to solve the technical problems mentioned in the background art.

[0007] The embodiments of this utility model are implemented as follows:

[0008] This application provides a wastewater purification device for a highway service area, comprising: a toilet wastewater treatment structure, including a toilet wastewater equalization tank, an A / O biological treatment tank, and a filtration and disinfection unit connected in sequence; a catering wastewater treatment structure, including a catering wastewater equalization tank, an air flotation oil removal unit, and an grease recovery unit, wherein the inlet of the air flotation oil removal unit is connected to the outlet of the catering wastewater equalization tank, the inlet of the grease recovery unit is connected to the oil outlet of the air flotation oil removal unit, and the wastewater outlet of the air flotation oil removal unit is connected to the A / O biological treatment tank; and a car wash wastewater treatment structure, including a car wash wastewater equalization tank, a magnetic coagulation sedimentation unit, a membrane distillation unit, and a sludge treatment unit, wherein the inlet of the magnetic coagulation sedimentation unit is connected to the outlet of the car wash wastewater equalization tank, and the wastewater outlet and sludge outlet of the magnetic coagulation sedimentation unit are respectively connected to the membrane distillation unit and the sludge treatment unit.

[0009] Furthermore, based on the aforementioned scheme, it also includes a shell-and-tube heat exchanger and an aeration disc. The shell-side inlet and outlet of the shell-and-tube heat exchanger are both connected to the aforementioned A / O biological treatment tank, and the tube-side inlet and outlet of the shell-and-tube heat exchanger are respectively connected to the atmosphere and the inlet of the aforementioned aeration disc.

[0010] The aforementioned aeration discs are installed inside the aforementioned catering wastewater regulating tank.

[0011] Furthermore, based on the aforementioned scheme, a circulation pump is installed at the shell-side inlet of the shell-and-tube heat exchanger, and an air pump is installed at the tube-side inlet of the shell-and-tube heat exchanger.

[0012] Furthermore, based on the aforementioned scheme, an air filter is installed at the inlet of the air pump.

[0013] Furthermore, based on the aforementioned scheme, an electric heating plate is also installed in the above-mentioned catering wastewater regulating tank.

[0014] Furthermore, based on the aforementioned scheme, a first temperature sensor is also installed in the above-mentioned catering wastewater regulating tank.

[0015] Furthermore, based on the aforementioned scheme, the shell-side inlet of the shell-and-tube heat exchanger extends into the A / O biological treatment tank and is equipped with a wastewater filter.

[0016] Furthermore, based on the aforementioned scheme, a second temperature sensor is installed at the shell-side outlet of the shell-and-tube heat exchanger.

[0017] Furthermore, based on the aforementioned scheme, an ammonia nitrogen sensor, an grease concentration sensor, and a turbidity concentration sensor are respectively installed at the inlet of the aforementioned toilet wastewater regulating tank, the inlet of the aforementioned catering wastewater regulating tank, and the inlet of the aforementioned car wash wastewater regulating tank.

[0018] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:

[0019] The wastewater purification device of this application treats wastewater from highway service areas by treating different types of wastewater separately according to their characteristics. Toilet wastewater is equalized in a regulating tank, then undergoes microbial degradation of organic matter in an A / O biological treatment tank, followed by filtration and disinfection to meet standards. Restaurant wastewater first passes through a regulating tank, then undergoes an air flotation oil removal unit to separate grease, which is then recycled in an oil recovery unit. The separated wastewater enters the A / O biological treatment tank for further purification. Car wash wastewater is regulated in a regulating tank, then undergoes magnetic coagulation sedimentation to remove suspended solids and some pollutants. Sludge enters a sludge treatment unit, and wastewater undergoes deep treatment via a membrane distillation unit. Its advantages include: achieving "classified treatment," with targeted processes solving problems such as pollutant interference, equipment wear and tear, and overload during mixed treatment; clear division of labor among components, with oil recovery from restaurant wastewater generating economic benefits, and sludge treatment and membrane distillation ensuring treatment effectiveness for car wash wastewater; and multi-unit collaboration making wastewater treatment more efficient and stable, easier to meet effluent standards, while reducing operating costs and maintenance difficulty, promoting the greening and resource utilization of service area wastewater treatment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural block diagram of a wastewater purification device for a highway service area, according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of the catering wastewater equalization tank, shell-and-tube heat exchanger, and A / O biological treatment tank in an embodiment of this utility model.

[0023] Icons: 1-Catering wastewater equalization tank, 2-First temperature sensor, 3-Electric heating plate, 4-Aeration disc, 5-Circulation pump, 6-Wastewater filter, 7-A / O biological treatment tank, 8-Shell-tube heat exchanger, 9-Air filter, 10-Air pump, 11-Second temperature sensor. Detailed Implementation

[0024] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0025] Example

[0026] Please refer to Figure 1 and Figure 2 This application provides a wastewater purification device for a highway service area, comprising: a toilet wastewater treatment structure, including a toilet wastewater equalization tank, an A / O biological treatment tank 7, and a filtration and disinfection unit connected in sequence; a catering wastewater treatment structure, including a catering wastewater equalization tank 1, an air flotation oil removal unit, and an grease recovery unit, wherein the inlet of the air flotation oil removal unit is connected to the outlet of the catering wastewater equalization tank 1, the inlet of the grease recovery unit is connected to the oil outlet of the air flotation oil removal unit, and the wastewater outlet of the air flotation oil removal unit is connected to the A / O biological treatment tank 7; and a car wash wastewater treatment structure, including a car wash wastewater equalization tank, a magnetic coagulation sedimentation unit, a membrane distillation unit, and a sludge treatment unit, wherein the inlet of the magnetic coagulation sedimentation unit is connected to the outlet of the car wash wastewater equalization tank, and the wastewater outlet and sludge outlet of the magnetic coagulation sedimentation unit are respectively connected to the membrane distillation unit and the sludge treatment unit.

[0027] The wastewater purification device of this application treats wastewater from highway service areas by treating different types of wastewater separately according to their characteristics. Toilet wastewater is equalized in a regulating tank, then undergoes microbial degradation of organic matter in an A / O biological treatment tank, followed by filtration and disinfection to meet standards. Restaurant wastewater first passes through a regulating tank, then undergoes an air flotation oil removal unit to separate grease, which is then recycled in an oil recovery unit. The separated wastewater enters the A / O biological treatment tank for further purification. Car wash wastewater is regulated in a regulating tank, then undergoes magnetic coagulation sedimentation to remove suspended solids and some pollutants. Sludge enters a sludge treatment unit, and wastewater undergoes deep treatment via a membrane distillation unit. Its advantages include: achieving "classified treatment," with targeted processes solving problems such as pollutant interference, equipment wear and tear, and overload during mixed treatment; clear division of labor among components, with oil recovery from restaurant wastewater generating economic benefits, and sludge treatment and membrane distillation ensuring treatment effectiveness for car wash wastewater; and multi-unit collaboration making wastewater treatment more efficient and stable, easier to meet effluent standards, while reducing operating costs and maintenance difficulty, promoting the greening and resource utilization of service area wastewater treatment.

[0028] As a preferred embodiment, it also includes a shell-and-tube heat exchanger 8 and an aeration disc 4. The shell-side inlet and outlet of the shell-and-tube heat exchanger 8 are both connected to the A / O biological treatment tank 7, and the tube-side inlet and outlet of the shell-and-tube heat exchanger 8 are respectively connected to the atmosphere and the inlet of the aeration disc 4.

[0029] The aforementioned aeration disc 4 is installed inside the aforementioned catering wastewater regulating tank 1.

[0030] In the above embodiment, the reaction process of microorganisms degrading organic matter in the A / O biological treatment tank 7 releases heat, causing the sewage temperature to rise. The heated sewage flows into the shell side of the shell-and-tube heat exchanger 8 for circulation. The tube side of the shell-and-tube heat exchanger 8 is connected to the atmosphere. The low-temperature atmosphere flows in from the tube side inlet and exchanges heat with the high-temperature sewage in the shell side. After absorbing heat, the temperature rises and is then transported to the aeration disc 4 through the tube side outlet. The aeration disc 4, which is set in the catering sewage equalization tank 1, releases the heated air into the sewage in the form of tiny bubbles. Its advantages lie in the fact that the wastewater, which naturally heats up after the reaction in the A / O biological treatment tank, is heated to the atmosphere through the shell-and-tube heat exchanger 8, realizing the recovery and reuse of heat and avoiding the additional energy consumption of heating the aeration air. The heated air enters the catering wastewater equalization tank 1 for aeration, which can effectively reduce the temperature fluctuation of wastewater caused by the injection of cold air, maintain the activity of microorganisms in the tank, and at the same time play a role in stirring and homogenizing water quality, preventing the sedimentation of organic matter, and inhibiting the production of odors by anaerobic microorganisms. This provides more stable operating conditions for subsequent treatment processes such as air flotation oil removal, and improves the overall efficiency and energy utilization rate of the wastewater treatment system.

[0031] In a preferred embodiment, the shell-side inlet of the shell-and-tube heat exchanger 8 is provided with a circulation pump 5, and the tube-side inlet of the shell-and-tube heat exchanger 8 is provided with an air pump 10.

[0032] In the above embodiment, the circulating pump 5 can force the sewage in the A / O biological treatment tank to circulate within the shell side, accelerating the sewage flow rate and volume, enhancing the heat exchange efficiency between the sewage and the air in the tube side, and ensuring that the heat from the sewage can be fully transferred to the air. The air pump 10 provides a stable and controllable air flow to the tube side, allowing the heated air to be delivered to the catering wastewater equalization tank 1 through the aeration disc 4 at a suitable pressure and flow rate, ensuring the uniformity and continuity of the aeration effect. The combination of the two not only improves the efficiency of heat recovery and air heating, but also ensures the stable operation of the aeration system, providing favorable conditions for biological sewage treatment and water quality equalization, and effectively improving the overall efficiency and operational stability of the sewage treatment system.

[0033] As a preferred embodiment, the air pump 10 is provided with an air filter 9 at its inlet.

[0034] In the above embodiment, an air filter 9 is installed at the inlet of the air pump 10, which can effectively intercept dust, particulate matter, impurities, and some microorganisms in the atmosphere, preventing them from entering the shell-and-tube heat exchanger 8 and the aeration system with the air. On the one hand, it can prevent impurities from clogging the heat exchanger pipes and the air holes of the aeration disc 4, ensuring smooth airflow and avoiding problems such as decreased heat exchange efficiency and uneven aeration caused by blockage. On the other hand, it reduces the wear of impurities on the internal components of the air pump 10, extends the service life of the air pump 10, and reduces equipment maintenance costs. In addition, the filtered clean air entering the catering wastewater equalization tank 1 for aeration can also prevent external pollutants from entering the wastewater, ensuring that the wastewater treatment effect is not affected and improving the stability and reliability of the entire wastewater treatment system.

[0035] As a preferred implementation method, the above-mentioned catering wastewater regulating tank 1 is also equipped with an electric heating plate 3.

[0036] In the above embodiment, an electric heating plate 3 is installed in the drinking water wastewater equalization tank, complementing and synergizing with the shell-and-tube heat exchanger 8 for heating the air. The shell-and-tube heat exchanger 8 utilizes the waste heat from the A / O biological treatment tank to heat the air, achieving heat recovery and utilization. However, when the wastewater temperature is insufficient or changes in the treatment load cause unstable heat recovery, the electric heating plate 3 can be activated as needed to precisely adjust the water temperature in the catering wastewater equalization tank 1. The combination of the two can more stably maintain the tank temperature within the optimal range for microbial treatment, promote the decomposition of organic matter in catering wastewater, and enhance the treatment effect of the air flotation oil removal unit. At the same time, the stable and suitable water temperature, combined with the aeration of heated air, can effectively prevent the coagulation of grease in the wastewater, reduce wastewater viscosity, improve water quality homogenization, and provide better and more stable influent conditions for subsequent treatment processes, comprehensively ensuring the efficient and stable operation of the wastewater treatment system.

[0037] As a preferred implementation method, the above-mentioned catering wastewater regulating tank 1 is also equipped with a first temperature sensor 2.

[0038] In the above embodiment, a first temperature sensor 2 is installed in the catering wastewater regulating tank 1 to monitor the water temperature in the tank in real time, so as to accurately control the electric heating plate 3 and the shell-and-tube heat exchanger 8 to work together, maintain the water temperature stable within a suitable treatment range, and ensure the wastewater treatment effect and system operating efficiency.

[0039] In a preferred embodiment, the shell-side inlet of the shell-and-tube heat exchanger 8 extends into the A / O biological treatment tank 7 and is equipped with a wastewater filter 6.

[0040] In the above embodiment, extending the shell-side inlet of the shell-and-tube heat exchanger 8 into the A / O biological treatment tank and installing a wastewater filter 6 offers multiple advantages. Firstly, drawing water directly from the A / O biological treatment tank shortens the wastewater transport path and reduces energy loss. Secondly, the wastewater filter 6 effectively intercepts suspended impurities and activated sludge fragments in the wastewater, preventing them from entering the shell-and-tube heat exchanger 8 and causing pipe blockage, reducing equipment wear risk, extending the heat exchanger's service life, and ensuring continuous and efficient heat exchange. Furthermore, the filtered wastewater entering the heat exchanger improves heat exchange efficiency and stability, ensuring the heated air temperature meets standards, providing a stable heat source for the aeration stage of the catering wastewater equalization tank 1, thereby enhancing the operational reliability and treatment efficiency of the entire wastewater treatment system.

[0041] As a preferred embodiment, a second temperature sensor 11 is provided at the shell-side outlet of the shell-and-tube heat exchanger 8.

[0042] In the above embodiment, a second temperature sensor 11 is installed at the shell-side outlet of the shell-and-tube heat exchanger 8, which can monitor the temperature of the wastewater after heat exchange in real time. This facilitates timely adjustment of parameters such as the flow rate of the circulating pump 5 and the air intake of the air pump 10, ensuring the stability of the wastewater temperature in the A / O biological treatment tank and the air heating effect, thereby improving the accuracy and stability of the wastewater treatment system operation.

[0043] As a preferred embodiment, an ammonia nitrogen sensor, an grease concentration sensor, and a turbidity concentration sensor are respectively installed at the inlet of the toilet wastewater regulating tank, the inlet of the catering wastewater regulating tank 1, and the inlet of the car wash wastewater regulating tank.

[0044] In the above embodiments, an ammonia nitrogen sensor is installed at the inlet of the toilet wastewater equalization tank, an grease concentration sensor is installed at the inlet of the catering wastewater equalization tank 1, and a turbidity concentration sensor is installed at the inlet of the car wash wastewater equalization tank. These sensors enable real-time and accurate monitoring of key pollution indicators for different types of wastewater. The ammonia nitrogen sensor, by controlling the ammonia nitrogen concentration in the toilet wastewater, allows for targeted adjustment of the operating parameters of the A / O biological treatment tank, optimizing the denitrification process. The grease concentration sensor provides timely feedback on the grease content of the catering wastewater, facilitating flexible control of the treatment intensity and grease recovery efficiency of the air flotation oil removal unit. The turbidity concentration sensor accurately detects the turbidity of the car wash wastewater, providing data support for the magnetic coagulation sedimentation unit and membrane distillation unit, enabling dynamic adjustment of reagent dosage and filtration parameters. The three types of sensors work together to achieve precise control over the characteristics of different wastewater types, providing data for each treatment unit, improving the automation level and treatment efficiency of the wastewater treatment system, and ensuring stable effluent quality that meets standards.

[0045] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0046] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A wastewater purification device for highway service areas, characterized in that, include: The toilet sewage treatment structure includes a toilet sewage equalization tank, an A / O biological treatment tank (7) and a filtration and disinfection treatment unit connected in sequence; The catering wastewater treatment structure includes a catering wastewater equalization tank (1), an air flotation oil removal unit, and an oil recovery unit. The inlet of the air flotation oil removal unit is connected to the outlet of the catering wastewater equalization tank (1), the inlet of the oil recovery unit is connected to the oil outlet of the air flotation oil removal unit, and the wastewater outlet of the air flotation oil removal unit is connected to the A / O biological treatment tank (7). The car wash wastewater treatment structure includes a car wash wastewater equalization tank, a magnetic coagulation sedimentation unit, a membrane distillation unit, and a sludge treatment unit. The inlet of the magnetic coagulation sedimentation unit is connected to the outlet of the car wash wastewater equalization tank, and the wastewater outlet and sludge outlet of the magnetic coagulation sedimentation unit are respectively connected to the membrane distillation unit and the sludge treatment unit.

2. The wastewater purification device for highway service areas according to claim 1, characterized in that, It also includes a shell-and-tube heat exchanger (8) and an aeration disc (4). The shell-side inlet and outlet of the shell-and-tube heat exchanger (8) are connected to the A / O biological treatment tank (7), and the tube-side inlet and outlet of the shell-and-tube heat exchanger (8) are connected to the atmosphere and the inlet of the aeration disc (4), respectively. The aeration disc (4) is located inside the catering wastewater regulating tank (1).

3. A wastewater purification device for highway service areas according to claim 2, characterized in that, The shell-and-tube heat exchanger (8) is equipped with a circulation pump (5) at the shell-side inlet and an air pump (10) at the tube-side inlet.

4. A wastewater purification device for highway service areas according to claim 3, characterized in that, The air pump (10) is equipped with an air filter (9) at its inlet.

5. A wastewater purification device for highway service areas according to claim 4, characterized in that, The catering wastewater regulating tank (1) is also equipped with an electric heating plate (3).

6. A wastewater purification device for highway service areas according to claim 5, characterized in that, The catering wastewater regulating tank (1) is also equipped with a first temperature sensor (2).

7. A wastewater purification device for highway service areas according to claim 6, characterized in that, The shell-side inlet of the shell-and-tube heat exchanger (8) extends into the A / O biological treatment tank (7) and is equipped with a wastewater filter (6).

8. A wastewater purification device for highway service areas according to claim 7, characterized in that, A second temperature sensor (11) is provided at the shell-side outlet of the shell-and-tube heat exchanger (8).

9. A wastewater purification device for highway service areas according to claim 1, characterized in that, An ammonia nitrogen sensor, an grease concentration sensor, and a turbidity concentration sensor are respectively installed at the inlet of the toilet wastewater regulating tank, the inlet of the catering wastewater regulating tank (1), and the inlet of the car wash wastewater regulating tank.

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