A device and method for advanced purification of sewage with reduced carbon emissions and water instability

Abstract

The present application relates to a kind of carbon emission reduction and water quantity unstable sewage advanced purification device and method, device includes the main body reaction unit of highway along the facility, the main body reaction unit is separated into advanced purification unit and water storage unit by support plate in longitudinal direction, advanced purification unit is set at the position higher than water storage unit, and purified liquid is gathered in water storage unit;The filler of the filler layer of advanced purification unit includes the material mixed by sulfur and calcium carbonate, and the filler surface grows with the long reproductive cycle of sulfur autotrophic denitrifying bacteria;Water distribution assembly is arranged in the water distribution area above advanced purification unit, so that water drop on the filler of filler layer, to carry out non-impact water distribution;Without additional carbon source, water and the sulfur autotrophic denitrification reaction of sulfur autotrophic denitrifying bacteria grown on the filler surface occurs and does not produce sludge;Recirculation device is set in the bottom of water storage unit, so that the sulfur autotrophic denitrification reaction of filler layer is not affected by water quantity and water quality fluctuation.

Description

[0001] The original basis for this divisional application is the patent application with application number (202310951760.X), application date of July 31, 2023, entitled "A sewage purification system and method for highway roadside facilities". Technical Field

[0002] This invention relates to the field of wastewater treatment technology, and in particular to a deep wastewater purification device and method for reducing carbon emissions and water volume instability. Background Technology

[0003] The rapid development of highways has also brought corresponding environmental problems. Among these, wastewater treatment in service areas has always been a key issue hindering highway operation and management. Currently, secondary treatment of wastewater from highway service areas mainly employs methods such as contact oxidation, AO (anaerobic digester), and biological rotating discs. However, due to the characteristics of service area wastewater, such as large fluctuations in water quality and quantity, low carbon-to-nitrogen ratios, and high nitrogen concentrations, secondary treatment has very limited effect on total nitrogen removal, resulting in effluent with still high total nitrogen levels, primarily nitrate nitrogen. With the current emphasis on the synergistic effect of pollution reduction and carbon reduction in service areas, to achieve the recycling of wastewater resources from highway service areas, it is necessary to perform advanced treatment on the secondary effluent before reuse for purposes such as toilet flushing and landscaping within the service areas.

[0004] Specifically, the amount of wastewater from highway service areas is related to the number of vehicles passing through. During holidays, the number of vehicles passing through service areas is 2 to 3 times that of ordinary weekdays, and the number of travelers increases significantly. Therefore, the pedestrian traffic through highway service areas is 2 to 5 times that of weekdays. Wastewater generation at service areas peaks during holidays and then declines from that peak on weekdays. Therefore, ordinary contact oxidation, AO, and biological rotating disc methods are difficult to apply to service areas with large fluctuations in water volume. If the water treatment capacity is set too large, the water treatment volume will be too low on weekdays, leading to the death of some bacteria. If the water treatment capacity is set at 1.5 times the weekday wastewater treatment volume, then during holidays, the large amount of wastewater discharged will prevent the bacteria from completely removing nitrogen, reducing denitrification efficiency.

[0005] Currently, advanced treatment technologies for secondary effluent from highway service areas mainly employ artificial wetlands, soil treatment, and stabilization ponds. While these technologies have some effect on total nitrogen removal, their ability to remove TN is weak because the nitrogen required for plant growth is limited. Furthermore, these treatment technologies require a large land area and are not the optimal solution.

[0006] To address the aforementioned problems, this invention utilizes sulfur autotrophic denitrification technology to construct a water storage device for advanced treatment and self-purification of secondary effluent from highway service areas. This device enables advanced treatment and recycling of secondary effluent, thereby achieving the recycling of wastewater from highway service areas. The device is simple to operate, has high total nitrogen removal efficiency, requires a small footprint, and has low operating costs, demonstrating significant economic benefits and practical value.

[0007] For example, Chinese Patent Publication No. CN206692523U discloses a sewage treatment system for a highway service station, including a septic tank, an oil-water separator, a bar screen, an equalization tank, a moving biobed reactor, an MBR membrane tank, a disinfection tank, a sludge thickening tank, a filter press, and a reclaimed water tank. The sewage pipes of the highway service station are connected to the inlet of the septic tank, the outlet of the septic tank is connected to the inlet of the oil-water separator, the outlet of the oil-water separator is connected to the inlet of the bar screen, the outlet of the bar screen is connected to the first inlet of the equalization tank, and the effluent from the equalization tank... The outlet of the moving biobed reactor is connected to the inlet of the moving biobed reactor, the outlet of the moving biobed reactor is connected to the inlet of the MBR membrane tank, the outlet of the MBR membrane tank is connected to the inlet of the disinfection tank, the outlet of the disinfection tank is connected to the inlet of the reclaimed water tank, the sludge discharge outlet of the oil-water separator and the sludge discharge outlet of the MBR membrane tank are both connected to the inlet of the sludge thickening tank, the outlet of the sludge thickening tank is connected to the inlet of the filter press, and the supernatant outlet of the sludge thickening tank and the filtrate outlet of the filter press are connected to the second inlet of the equalization tank. Although this invention avoids secondary pollution through pretreatment, then biochemical treatment, and finally comprehensive treatment with membranes, it consumes a lot of resources and does not meet the development trend of reducing carbon emissions.

[0008] This invention aims to provide a wastewater treatment system applicable to roadside facilities that reduce carbon emissions.

[0009] Furthermore, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making this invention, but due to space limitations, not all details and contents were listed in detail. However, this does not mean that the present invention does not possess the features of these prior art. On the contrary, the present invention already possesses all the features of the prior art, and the applicant reserves the right to add relevant prior art to the background art. Summary of the Invention

[0010] The amount of wastewater generated at highway service areas is related to the number of vehicles passing through. During holidays, the number of vehicles passing through service areas is 2 to 3 times that of ordinary weekdays, resulting in a significant increase in travelers. Therefore, the pedestrian flow through highway service areas is 2 to 5 times that of weekdays. Wastewater generation at service areas peaks during holidays and then declines during weekdays. Common methods such as contact oxidation, AO (anaerobic digester) processes, and biological rotating disc processes are difficult to apply to service areas with large fluctuations in water volume. If the water treatment capacity is set too large, the treatment volume will be too low on weekdays, leading to the death of some bacteria. If the water treatment capacity is set at 1.5 times the weekday wastewater treatment volume, then during holidays, the large amount of wastewater discharged will prevent the bacteria from completely removing nitrogen, reducing denitrification efficiency.

[0011] Therefore, how to rationally set up a sewage purification system to address the large fluctuations in sewage volume along highways is a technical problem that has not yet been solved.

[0012] To address the shortcomings of existing technologies, this invention provides a wastewater purification system for highway infrastructure, comprising at least a main reaction unit. The main reaction unit is longitudinally divided into a deep purification unit and a water storage unit by a support plate. The deep purification unit is located above the water storage unit. At least one layer of packing material in the deep purification unit contains microorganisms capable of performing sulfur autotrophic denitrification to decompose pollutants. The sulfur autotrophic denitrification process is an autotrophic reaction, requiring no external carbon source, and can stably remove nitrogen from wastewater with a low carbon-to-nitrogen ratio. Furthermore, the sulfur autotrophic denitrifying bacteria are autotrophic with a long reproduction cycle, avoiding the generation of large amounts of residual sludge during operation and significantly reducing operating costs.

[0013] The packing layer comprises at least a mixture of sulfur and calcium carbonate. During the operation of the sulfur autotrophic denitrification filter, the sulfur packing provides the sulfur source, while the calcium carbonate packing, acting as a slow-release packing, provides alkalinity, together maintaining the optimal alkalinity environment for sulfur autotrophic denitrification microorganisms.

[0014] Preferably, the volume ratio of sulfur to calcium carbonate is 1 to 5:2. Within this ratio range, no residual sludge is generated, and the reflux device at the bottom of the water storage unit ensures that it is unaffected by fluctuations in water volume and quality.

[0015] Preferably, the deep purification unit and the water storage unit are respectively connected to the control unit and respond to the control commands of the control unit. When the distance between the liquid level of the water storage unit and the bottom of the deep purification unit is less than the distance threshold, and no water reuse request is received, the control unit controls the third control valve to open so that some water can be discharged. When the liquid level of the water storage unit is lower than the liquid level threshold, the control unit controls the third control valve to close.

[0016] This invention enables the automatic control of water outlet, circulation, and reuse valves, achieving multi-functional linkage of water outlet, circulation, and reuse in the device. The high degree of automation allows the stored water to undergo multiple deep purification units for circulation treatment, further improving the water quality.

[0017] Preferably, the purification system further includes a water outlet unit, which includes at least a booster pump start / stop controller, a first control valve, and a second control valve. In response to a water reuse request, the control unit controls the booster pump start / stop controller and the first control valve to open respectively, thereby realizing water storage and reuse. Through water storage and reuse, the purified water can be reused, further saving water resources.

[0018] In response to the request for water storage circulation, the control unit controls the start / stop controller of the booster pump and the second control valve to open and the first control valve to close, thereby realizing the circulation of the stored water. Through the circulation of the stored water, even when the wastewater treatment volume decreases, there is still enough wastewater to maintain the stability of the microbial community, while also improving the denitrification effect of the wastewater.

[0019] Preferably, the system further includes a level control unit connected to the control unit, which includes at least a float valve and a level sensor. The level sensor is connected to the float valve via a valve stem, and the control unit adjusts at least one valve in the effluent unit based on the level data sent by the level sensor to control the level of the water storage unit. By controlling the level, the system avoids the situation where too much water in the storage unit affects the wastewater treatment of the packing layer, thus maintaining stable wastewater treatment efficiency.

[0020] Preferably, the system also includes a pretreatment unit connected to the water distribution assembly. Pretreatment filters out particulate matter in advance. The water distribution assembly is positioned in the water distribution area above the deep purification unit to distribute water to the packing layer in a non-impact manner. This non-impact water distribution ensures the packing layer is evenly distributed and unaffected by water flow, maintaining a stable environment for the microbial community.

[0021] Preferably, the top of the main reaction unit is provided with an exhaust port, which is a one-way exhaust port. The one-way exhaust port effectively prevents excessive inflow of external air, maintaining a favorable oxygen-deficient environment inside the device.

[0022] Preferably, the volume ratio of sulfur to calcium carbonate is 1:1. During backwashing, the 1:1 mixing ratio of sulfur to calcium carbonate ensures uniform mixing of the packing material and avoids uneven stratification of the packing material caused by the backwashing operation.

[0023] This invention also provides a method for purifying wastewater from roadside facilities. The method includes at least: placing microorganisms capable of sulfur autotrophic denitrification within at least one packing layer in a deep purification unit to decompose pollutants. The packing layer comprises at least a mixture of sulfur and calcium carbonate. The sulfur autotrophic denitrification process in this invention is an autotrophic reaction, requiring no external carbon source and stably achieving nitrogen removal from wastewater with a low carbon-to-nitrogen ratio. Furthermore, the sulfur autotrophic denitrifying bacteria are autotrophic with a long reproduction cycle, avoiding the generation of large amounts of residual sludge during operation and significantly reducing operating costs.

[0024] Preferably, the volume ratio of sulfur to calcium carbonate is 1 to 5:2. Within this ratio range, no residual sludge is generated, and the reflux device at the bottom of the water storage unit ensures that it is unaffected by fluctuations in water volume and quality.

[0025] Preferably, the method further includes: setting the deep purification unit higher than the water storage unit; when the distance between the bottom of the water storage unit and the deep purification unit is less than a distance threshold, when no water reuse request is received, the control unit controls the third control valve to open so that some water is discharged; when the liquid level of the water storage unit is lower than the liquid level threshold, the control unit controls the third control valve to close.

[0026] This invention enables the automatic control of water outlet, circulation, and reuse valves, achieving multi-functional linkage of water outlet, circulation, and reuse in the device. The high degree of automation allows the stored water to undergo multiple deep purification units for circulation treatment, further improving the water quality.

[0027] The method of this invention can achieve the functions of deep treatment, storage and reuse of secondary effluent from highway service areas through a single tank, shortening the process chain, reducing the footprint, and significantly reducing wastewater treatment costs. Attached Figure Description

[0028] Figure 1 This is a simplified schematic diagram of the module connection relationship of a sewage purification system for roadside facilities according to a preferred embodiment of the present invention.

[0029] List of reference numerals

[0030] 1: Inlet pipe; 2: Inlet; 3: Filter assembly; 4: Water distribution assembly; 5: Pretreatment unit; 6: Water distribution area; 7: Deep purification unit; 8: Packing layer; 9: Support plate; 10: Sampling hole; 11: Water storage unit; 12: Booster pump; 13: Reuse pipe; 14: Booster pump start / stop controller; 15: First control valve; 16: Check valve; 17: Second control valve; 18: Outlet pipe; 19: Outlet; 20: Third control valve; 21: Vent; 22: Main reaction unit; 23: Float valve; 24: Valve stem; 25: Liquid level sensor; 26: Control unit. Detailed Implementation

[0031] The following is a detailed explanation with reference to the accompanying drawings.

[0032] Existing wastewater treatment technologies for service areas often employ contact oxidation, AO (anaerobic digester), and biological rotating disc methods, making it difficult to meet the total nitrogen (TN) standards for secondary effluent, especially since the main nitrogen component is nitrate. To further reduce TN, existing technologies typically incorporate constructed wetlands or soil treatment after the secondary water treatment process. While this achieves some TN removal, the limited nitrogen required for plant growth limits its effectiveness in TN removal, and these technologies require significant land area. Alternatively, existing technologies add denitrification to the secondary wastewater treatment process. However, due to the low carbon-to-nitrogen ratio in the wastewater, additional carbon sources are needed, increasing treatment costs and carbon emissions over the process's lifecycle. None of these existing technologies are optimal solutions for wastewater treatment along highways, as they are ill-suited to the sudden and rapid increase in wastewater volume at highway service areas during holidays. To overcome these shortcomings, this invention improves the purification method of the deep purification unit by employing sulfur autotrophic denitrification technology for deep treatment of secondary effluent, thereby improving nitrogen removal efficiency.

[0033] Example 1

[0034] The wastewater purification system for roadside facilities of the present invention includes at least a main reaction unit 22, a deep purification unit 7, a water storage unit 11, an effluent unit, and a control unit 26. The deep purification unit 7, the water storage unit 11, and the effluent unit are respectively connected to the control unit 26 and respond to the control commands of the control unit 26. The influent unit is also connected to the control unit 26 and is controlled by the control unit 26.

[0035] The control unit 26 of the present invention is a dedicated integrated chip, processor, microcontroller, etc., capable of executing the running program of the method of the present invention.

[0036] like Figure 1 As shown, the main reaction unit 22 is an integrated device, internally divided into a pretreatment unit 5, a deep purification unit 7, and a water storage unit 11 from top to bottom. The pretreatment unit 5 is positioned above the deep purification unit 7. The deep purification unit 7 is positioned above the water storage unit 11.

[0037] The pretreatment unit 5 is connected to the inlet unit so that the wastewater to be treated can be discharged into the pretreatment unit 5 for pretreatment. The inlet unit includes at least an inlet pipe 1, an inlet 2, a filter assembly 3, and a water distribution assembly 4. The inlet 2 is located at the inlet of the pretreatment unit 5. The filter assembly 3 is installed in the pretreatment unit 5 to filter the inlet water. The filter assembly 3 is, for example, a filter plate, filter cotton, etc. The outlet of the pretreatment unit 5 is connected to the water distribution assembly 4. The water distribution assembly 4 is preferably a pipe with densely packed water distribution holes. Preferably, the water distribution holes are arranged according to a certain pattern, or the water distribution holes are evenly arranged.

[0038] Preferably, such as Figure 1 As shown, the pretreatment unit 5 is positioned to the side of the deep purification unit 7, allowing the water distribution assembly 4 to be arranged in the water distribution area 6 above the deep purification unit 7 for non-impact water distribution. This arrangement enables the water distribution assembly 4 to widely distribute the pretreated wastewater across various areas of the deep water treatment unit 7 surface, preventing uneven wastewater distribution. If the water distribution assembly 4 only distributes water to the same area, the area being watered will experience structural deformation under the impact of the water flow. This structural deformation could manifest as pits formed by the impact. This would also lead to uneven distribution of bacteria, hindering the long-term widespread distribution of bacteria and the maintenance of activity in large numbers of bacteria.

[0039] Preferably, based on the liquid level difference between the pretreatment unit 5 and the deep purification unit 7, the water distribution assembly 4 is disposed in the water distribution area 6 in the vertical space above the deep purification unit 7, so that the incoming water can be evenly distributed in the deep purification unit 7. This arrangement allows the incoming water to flow based on gravity, reducing the use of power devices such as pumps and lowering energy consumption.

[0040] Secondary effluent, acting as influent, flows through inlet pipe 1 into inlet 2 of the device via gravity or pressurization. It then passes through filter assembly 3 to further remove trace suspended impurities in the water before finally flowing into distribution assembly 4 for uniform water distribution.

[0041] Preferably, the deep purification unit 7 includes at least a support plate 9, a packing layer 8, and at least one sampling port 10. The support plate 9 is arranged within the main reaction unit 22 in such a way that it longitudinally divides the main reaction unit 22 into the deep purification unit 7 and the water storage unit 11. The sampling port 10 is located on the side wall of the deep purification unit 7 near the support plate 9 to facilitate the replacement and replenishment of the packing.

[0042] Preferably, the packing layer 8 in the deep purification unit 7 comprises at least a mixture of sulfur and calcium carbonate in a certain proportion. The volume ratio of sulfur to calcium carbonate is 1 to 5:2. The preferred particle size of the packing is: 10 to 80 mesh for sulfur packing and 10 to 80 mesh for calcium carbonate packing.

[0043] More preferably, the ratio of sulfur to calcium carbonate is 1:1. The particle size of the packing material is 20 mesh for sulfur packing and 20 mesh for calcium carbonate packing. The deep purification unit 7 adopts a packing biofilm form, which produces no residual sludge, and the water storage unit 11 is equipped with a reflux device at the bottom to prevent it from being affected by fluctuations in water volume and quality.

[0044] In this invention, the volume of the packing layer is related to the concentration of nitrate nitrogen in the influent. The preferred volume of the packing layer is 30 m³. 3 ~100m 3 .

[0045] With a filler layer volume of 30m³ 3 Under these conditions, the concentration C of nitrate nitrogen in the influent (硝态氮) =0~40mg / L.

[0046] With a filler layer volume of 50m³ 3 Under these conditions, the concentration C of nitrate nitrogen in the influent (硝态氮) =40~100mg / L.

[0047] With a filler layer volume of 100 m³ 3 Under these conditions, the concentration C of nitrate nitrogen in the influent (硝态氮) =100~200mg / L.

[0048] Preferably, the filler layer volume is 30m³. 3 The influent nitrate nitrogen concentration is 40 mg / L. Under normal operating conditions of the secondary wastewater treatment in the service area, the effluent total nitrogen is below 40 mg / L. Therefore, the packing layer volume of the device of this invention is 30 m³. 3 This can meet the requirements for secondary effluent deep treatment and reuse in service areas.

[0049] Currently, wastewater treatment in highway service areas primarily employs methods such as contact oxidation, AO (autoclave-oxidation), and biological rotating disc processes. These processes are all based on heterotrophic denitrification, where heterotrophic denitrifying microorganisms remove total nitrogen by consuming organic carbon sources in the water. However, due to the low carbon-to-nitrogen ratio and high nitrogen concentration in highway service area wastewater, the total nitrogen in the secondary effluent is difficult to meet standards without an external carbon source, and the main nitrogen component is nitrate nitrogen. To achieve deep nitrogen removal, one solution is to add an additional organic carbon source to supplement the carbon source requirements of the heterotrophic denitrification process. However, long-term carbon source addition significantly increases operating costs. Furthermore, carbon source addition also presents problems such as inaccurate dosing, excessive addition leading to secondary pollution, and an increased risk of COD exceeding standards in the effluent. Therefore, advanced treatment of the secondary effluent is necessary.

[0050] Currently, advanced treatment technologies for secondary effluent from highway service areas mainly employ artificial wetlands, soil treatment, and stabilization ponds. While these technologies have some effect on total nitrogen removal, their ability to remove TN is weak because the nitrogen required for plant growth is limited. Therefore, these treatment technologies require a large land area.

[0051] The principle of nitrogen removal in packing layer 8 is as follows.

[0052] The system's influent drips from the water distribution component 4 onto the packing material in the packing layer 8, flowing sequentially from top to bottom across the packing surface. There, it reacts with sulfur-autotrophic denitrifying bacteria growing on the packing surface, undergoing a sulfur-autotrophic denitrification reaction to convert nitrate nitrogen in the water into nitrogen gas, thus achieving denitrification. The sulfur-autotrophic denitrification reaction is as follows: sulfur-autotrophic denitrifying bacteria use reduced sulfur as an electron donor to convert NO3- into nitrogen gas. - -N or NO2 - -N is reduced to N2 and removed.

[0053] The advantage of using packing layer 8 for nitrogen removal in this invention is that sulfur-autotrophic denitrifying bacteria utilize reduced sulfur as an electron donor to remove NO3. - -N or NO2 - -N is reduced to N2 for removal. The sulfur autotrophic denitrification process is an autotrophic reaction, requiring no external carbon source, and can stably remove nitrogen from wastewater with a low C / N ratio. Furthermore, the sulfur autotrophic denitrifying bacteria are autotrophic with a long reproduction cycle, avoiding the large-scale generation of residual sludge during operation and significantly reducing operating costs.

[0054] When wastewater treatment volume surges and experiences a brief peak during holidays, sulfur-autotrophic denitrifying bacteria can rapidly multiply and maintain a stable nitrogen removal capacity. Even when wastewater treatment volume drops rapidly during weekdays, sulfur-autotrophic denitrifying bacteria can maintain their nitrogen removal capacity, preventing a sudden decrease in the number of bacteria and a decline in nitrogen removal capacity.

[0055] Setting the ratio of sulfur to calcium carbonate to 1:1 yields better technical results.

[0056] First, the optimal ratio of sulfur to calcium carbonate is 1:1, a ratio verified through gradient experiments. During the operation of the sulfur autotrophic denitrification filter, the sulfur packing provides the sulfur source, while the calcium carbonate packing, acting as a slow-release packing, provides alkalinity, jointly maintaining the optimal alkalinity environment for sulfur autotrophic denitrifying microorganisms. Simultaneously, the packing layer needs regular backwashing during operation to replace the biofilm with fresh material, ensuring high activity of the biofilm on the packing surface. During backwashing, the 1:1 mixing ratio of sulfur and calcium carbonate ensures uniform mixing of the packing, preventing uneven stratification caused by backwashing. Second, the 1:1 mixing ratio also ensures synchronized consumption and replacement cycles for the sulfur and calcium carbonate packing, avoiding waste due to misaligned operation.

[0057] The liquid purified by the deep purification unit 7 is collected in the water storage unit 11 within the main reaction unit 22.

[0058] The water storage unit 11 includes at least a booster pump 12, a reuse pipe 13, and a booster pump start / stop controller 14. The booster pump 12 is located at the bottom of the water storage unit 11, near the side wall of the main reaction unit 22, and is connected to the water distribution assembly 4 via the reuse pipe 13 and a second control valve 17. A first control valve 15 and a check valve 16 are sequentially installed at the end of the reuse pipe 13 furthest from the booster pump 12 and the water distribution assembly 4. A second control valve 17 is located at the end of the water distribution assembly 4 near the reuse pipe 13. The second control valve 17 is used to control the on / off flow of the water stored in the water storage unit 11.

[0059] Preferably, the device of the present invention further includes a liquid level control unit. The liquid level control unit is connected to the control unit 26 via a wired and / or wireless means. The liquid level control unit includes at least a float valve 23 and a liquid level sensor 25. The liquid level sensor 25 is disposed within the water storage unit 11 to monitor the liquid level, and the liquid level sensor 25 is connected to the float valve 23 via a valve stem 24. The control unit 26 adjusts at least one valve in the water outlet unit based on the liquid level data transmitted by the liquid level sensor 25 to control the liquid level of the water storage unit.

[0060] Preferably, the water outlet unit includes at least a booster pump start / stop controller 14 and a first control valve 15. The water outlet unit also includes a water outlet pipe 18, a water outlet 19, a third control valve 20, and a check valve 16. The water outlet 19 is located on the side wall of the water storage unit 11 near the bottom. The third control valve 20 and the check valve 16 are sequentially installed on the water outlet pipe 18 near the end of the water outlet 19.

[0061] Preferably, the vertical distance between the water outlet 19 and the bottom of the water storage unit 11 is 0.2 to 0.5 meters. The vertical distance between the liquid level sensor and the bottom of the support plate 9 is 0.1 to 0.5 meters. The vertical distance between the sampling hole 10 and the top of the support plate is 0.1 to 0.4 meters. The set distance between the liquid level of the water storage unit and the bottom of the support plate is 0.5 meters.

[0062] A booster pump start / stop controller 14 is installed on the booster pump 12. A second control valve 17 is installed on the water distribution assembly 4 in the water inlet unit. The reuse pipe 13 is connected to the water distribution assembly 4 via the second control valve 17. In response to a reuse request, the booster pump start / stop controller 14 starts, the control unit controls the first control valve 15 to open, and the second control valve 17 to close, so as to realize the reuse of stored water.

[0063] Preferably, the vertical distance between the water outlet and the bottom of the water storage unit is 0.3 meters. The vertical distance between the top of the liquid level sensor and the bottom of the support plate is 0.2 meters. The vertical distance between the sampling hole 10 and the top of the support plate is 0.2 meters. The set distance between the liquid level of the water storage unit and the bottom of the support plate is 0.5 meters.

[0064] Preferably, the deep purification unit 7 is positioned above the water storage unit 11. When the distance between the bottom of the water storage unit 11 and the bottom of the deep purification unit 7 is less than a distance threshold, and no water reuse request is received, the control unit 26 controls the third control valve 20 to open to allow some water to be discharged. When the liquid level is lower than the liquid level threshold, the control unit 26 controls the third control valve 20 to close.

[0065] For example, when the distance between the liquid level of the water storage unit 11 and the bottom of the support plate 9 is less than the distance threshold, and the user has no need for recycled water, the third control valve 20 is opened, the stored water is discharged, and the third control valve 20 is closed when the liquid level of the water storage unit 11 is lower than the set liquid level at the top of the lift pump 12.

[0066] When the distance between the liquid level in the water storage unit 11 and the bottom of the support plate 9 is less than the distance threshold, and the user has a need for recycled water, the booster pump start / stop controller 14 starts, the first control valve 15 opens, and the second control valve 17 closes to carry out water storage and recycling. When the liquid level in the water storage unit 11 is lower than the set liquid level at the top of the booster pump 12, the booster pump start / stop controller 14 and the first control valve 15 close.

[0067] When the distance between the liquid level in the water storage unit 11 and the bottom of the support plate 9 is greater than the distance threshold, and the user has no need for recycled water, the booster pump start / stop controller 14 and the second control valve 17 are opened to circulate the water in the water storage unit 11 (to achieve better water quality), and the second control valve 17 is closed when the specified running time is reached or when the user has a need for recycled water.

[0068] With this configuration, the device of the present invention is equipped with automatic control valves for water discharge, circulation, and reuse, which can realize multi-functional linkage of water discharge, circulation, and reuse, with a high degree of automation and simple operation.

[0069] Preferably, the height-to-diameter ratio of the main reaction unit 22 is 2 to 10:1. The volume ratio of the pretreatment unit, water distribution area, deep purification unit 7, and water storage unit is 1 to 20:1:5 to 30:5 to 100.

[0070] More preferably, the height-to-diameter ratio of the main reaction unit 22 is 1:1. The volume ratio of the pretreatment unit, the water distribution area, the deep purification unit 7, and the water storage unit is 2:1:6:9.

[0071] Preferably, the main reaction unit 22 is provided with an exhaust port 21 at its top. The exhaust port is a one-way exhaust port. The optimal working environment for sulfur autotrophic denitrifying bacteria is anoxic or anaerobic. Agronomic or microaerobic conditions will inhibit the activity of sulfur autotrophic denitrifying bacteria and reduce their nitrogen removal efficiency. Setting a one-way exhaust port can effectively prevent excessive inflow of external air and maintain a good anoxic environment inside the device.

[0072] Temperature and alkalinity can affect the wastewater treatment efficiency of sulfur autotrophic denitrifying bacteria in the packing layer 8. Preferably, the deep purification unit 7 of the present invention can also be adaptively equipped with a temperature detection component and / or a pH detection component. The type of temperature detection component is not limited, such as a waterproof water temperature meter, water temperature sensor, etc. The pH detection component is, for example, a pH meter. The optimal pH value for sulfur autotrophic denitrification is approximately 7.0. The temperature detection component and / or pH detection component can be connected to the control unit 26 via wired or wireless means. The wastewater treatment efficiency is evaluated based on the received temperature and pH parameters and pre-set treatment efficiency samples related to the temperature and pH parameters. Preferably, the deep purification unit 7 can also be adaptively equipped with a heating component. The heating component is, for example, an electric heating wire, electric heater, etc., used to increase the temperature of the environment in the deep purification unit 7, avoiding a low temperature environment that reduces the treatment efficiency of the bacterial community. The heating component is connected to the control unit 26 via wired or wireless means and is controlled by the control unit 26.

[0073] Preferably, the packing layer 8 of the deep purification unit 7 includes at least two sub-packing layers with stepped heights. The temperature in the sub-packing layers increases as the height of the sub-packing layers decreases. The temperature in the sub-packing layers is heated by a heating component, which is controlled and regulated by a control unit 26. For example, the first height of the first sub-packing layer is higher than the second height of the second sub-packing layer. Therefore, the second temperature of the second sub-packing layer is 0.5 to 3 degrees Celsius higher than the first temperature of the first sub-packing layer. For example, the temperature difference is 0.5°C, 1°C, 1.5°C, 2°C, 2.5°C, etc. The principle behind this arrangement is that, to save space in wastewater treatment, wastewater treatment systems are generally located underground. Underground temperatures are generally lower than surface temperatures. Furthermore, the further away from the surface, the lower the temperature. The optimal temperature for sulfur autotrophic denitrification is around 30°C. Low temperatures inhibit the denitrification performance of the denitrifying bacteria system, leading to a decrease in the denitrification rate. Under normal circumstances, the temperature of the second sub-packing layer tends to be lower as the distance from the surface increases. Therefore, as the height of each sub-packing layer changes in a stepwise manner, the temperature of each sub-packing layer also changes in a stepwise manner to compensate for the temperature loss caused by the surrounding environment in the lower-height sub-packing layers and maintain the stability of the activity of sulfur autotrophic denitrifying bacteria in the sub-packing layers.

[0074] Preferably, the number of sub-filler layers in the filler layer 8 is not limited to two layers, but can be three or even more layers.

[0075] Example 2

[0076] This embodiment is a further improvement on embodiment 1, and repeated content will not be described again.

[0077] This invention provides a method for purifying wastewater from roadside facilities, the method comprising at least:

[0078] The liquid purified by the deep purification unit 7 is input into the water storage unit 11 in the main reaction unit 22 and collected. The control unit 26 adjusts at least one valve in the water outlet unit based on the liquid level data sent by the liquid level sensor 25 to control the liquid level of the water storage unit.

[0079] In response to a request for reused water, the control unit 26 controls the start / stop controller 14 of the booster pump to start, the first control valve 15 to open, and the second control valve 17 to close, so as to realize the reuse of stored water. The first control valve 15 is installed on the reuse pipe 13 in the water storage unit, and the second control valve 17 is installed on the water distribution assembly 4 in the water inlet unit. The reuse pipe 13 and the water distribution assembly 4 are connected through the second control valve 17.

[0080] The deep purification unit 7 is positioned higher than the water storage unit 11. When the distance between the bottom of the water storage unit 11 and the bottom of the deep purification unit 7 is less than a distance threshold, and no water reuse request is received, the control unit 26 controls the third control valve 20 to open to allow some water to be discharged. When the liquid level is lower than the liquid level threshold, the control unit 26 controls the third control valve 20 to close.

[0081] For example, when the distance between the liquid level in the water storage unit 11 and the bottom of the support plate 9 is less than a distance threshold, and the user has no need for recycled water, the third control valve 20 opens, and the stored water is discharged. When the liquid level in the water storage unit 11 is lower than the set liquid level at the top of the booster pump 12, the third control valve 20 closes.

[0082] When the distance between the liquid level in the water storage unit 11 and the bottom of the support plate 9 is less than the distance threshold, and when the user has a need for recycled water, the booster pump start / stop controller 14 is started, the first control valve 15 is opened, and the second control valve 17 is closed to carry out water storage and recycling. When the liquid level in the water storage unit 11 is lower than the set liquid level at the top of the booster pump 12, the booster pump start / stop controller 14 and the first control valve 15 are closed.

[0083] When the distance between the liquid level in the water storage unit 11 and the bottom of the support plate 9 exceeds a distance threshold, and the user has a need for recycled water, the booster pump start / stop controller 14 and the second control valve 17 open to circulate the water in the water storage unit 11 (to achieve better water quality). The second control valve 15 closes after a specified operating time or when the user has a need for recycled water. With this configuration, the device of the present invention incorporates automatic control valves for water output, circulation, and recycling, enabling multi-functional linkage of water output, circulation, and recycling, resulting in a high degree of automation and simple operation.

[0084] It should be noted that the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this invention, and these solutions all fall within the scope of this invention and its protection. Those skilled in the art should understand that this specification and its accompanying drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this invention is defined by the claims and their equivalents. This specification contains multiple inventive concepts; terms such as "preferredly," "according to a preferred embodiment," or "optionally" indicate that the corresponding paragraph discloses an independent concept. The applicant reserves the right to file divisional applications based on each inventive concept.

Claims

1. A wastewater deep purification device for reducing carbon emissions and water instability, comprising a main reaction unit (22) for roadside facilities, wherein the main reaction unit (22) is longitudinally divided into a deep purification unit (7) and a water storage unit (11) by a support plate (9), characterized in that, The deep purification unit (7) is positioned above the water storage unit (11), and the purified liquid is collected in the water storage unit (11). The deep purification unit (7) includes a packing layer (8), the packing of which includes a mixture of sulfur and calcium carbonate, and sulfur autotrophic denitrifying bacteria with a long reproduction cycle grow on the surface of the packing. The water distribution component (4) is arranged in the water distribution area (6) above the deep purification unit (7), so that the influent drips onto the packing of the packing layer (8) to perform non-impact water distribution. Without the addition of an external carbon source, the influent reacts with the sulfur autotrophic denitrifying bacteria growing on the surface of the packing to undergo sulfur autotrophic denitrification and denitrification without producing sludge. A reflux device is installed at the bottom of the water storage unit (11) so that the sulfur autotrophic denitrification reaction of the packing layer (8) is not affected by fluctuations in water volume and water quality. The deep purification unit (7) and the water storage unit (11) are respectively connected to the control unit (26) and respond to the control commands of the control unit (26). When the distance between the liquid level of the water storage unit (11) and the bottom of the deep purification unit (7) is less than the distance threshold, and no water reuse request is received, the control unit (26) controls the third control valve (20) to open so that some water is discharged. When the liquid level of the water storage unit (11) is lower than the liquid level threshold, the control unit (26) controls the third control valve (20) to close.

2. The wastewater deep purification device according to claim 1, characterized in that, The pretreatment unit (5) is positioned above the deep purification unit (7) to pretreat the wastewater to be treated.

3. The wastewater deep purification device according to claim 2, characterized in that, The volume ratio of sulfur to calcium carbonate is 1 to 5:

2.

4. The wastewater deep purification device according to claim 3, characterized in that, The packing layer (8) includes at least two sub-packing layers with stepped heights; The temperature in the sub-packing layer increases as the height of the sub-packing layer decreases, in order to compensate for the temperature loss caused by the surrounding environment in the lower-height sub-packing layer and maintain the stability of the activity of sulfur autotrophic denitrifying bacteria in the sub-packing layer.

5. The wastewater deep purification device according to any one of claims 1 to 4, characterized in that, The volume ratio of the pretreatment unit (5), the water distribution area (6), the deep purification unit (7), and the water storage unit (11) is 1-20:1:5-30:5-100.

6. The wastewater deep purification device according to claim 3, characterized in that, In the filler layer (8), the ratio of sulfur to calcium carbonate is 1:

1.

7. The wastewater deep purification device according to any one of claims 1 to 4, characterized in that, In the packing layer (8), the first height of the first sub-packing layer is higher than the second height of the second sub-packing layer; The second temperature of the second sub-packing layer is 0.5 to 3 degrees Celsius higher than the first temperature of the first sub-packing layer.

8. A method for using the wastewater deep purification device for reducing carbon emissions and water instability as described in any one of claims 1 to 7, the method comprising: The main reaction unit (22) of the highway roadside facilities is longitudinally divided into a deep purification unit (7) and a water storage unit (11) by a support plate (9), characterized in that, The deep purification unit (7) is positioned above the water storage unit (11), and the purified liquid is collected in the water storage unit (11). The deep purification unit (7) includes a packing layer (8), the packing of the packing layer (8) includes a material composed of a mixture of sulfur and calcium carbonate, and sulfur autotrophic denitrifying bacteria with a long reproduction cycle grow on the surface of the packing. The water distribution assembly (4) is arranged in the water distribution area (6) above the deep purification unit (7), so that the influent drips onto the packing of the packing layer (8) to carry out non-impact water distribution; without the addition of an external carbon source, the influent reacts with the sulfur autotrophic denitrifying bacteria growing on the surface of the packing to undergo sulfur autotrophic denitrification and denitrification reaction without producing sludge. A reflux device is installed at the bottom of the water storage unit (11) so that the sulfur autotrophic denitrification reaction of the packing layer (8) is not affected by fluctuations in water volume and water quality.

9. The method according to claim 8, characterized in that, The method further includes: in the packing layer (8), the first height of the first sub-packing layer is higher than the second height of the second sub-packing layer; The second temperature of the second sub-packing layer is 0.5 to 3 degrees Celsius higher than the first temperature of the first sub-packing layer.

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