Sewage deep purification device and method for reducing carbon emission and unstable water volume

Abstract

The invention relates to a sewage deep purification device and method for reducing carbon emission and unstable water yield, the device comprises a main body reaction unit of facilities along a highway, the main body reaction unit is longitudinally divided into a deep purification unit and a water storage unit by a support plate, the deep purification unit is arranged at a position higher than the water storage unit, and the water storage unit is arranged at a position higher than the deep purification unit. The purified liquid is gathered in the water storage unit; a filler of a filler layer of the deep purification unit comprises a material formed by mixing sulfur and calcium carbonate, and sulfur autotrophic denitrifying bacteria with a relatively long reproduction period grow on the surface of the filler; the water distribution assembly is arranged in a water distribution area above the deep purification unit, so that inlet water drops on filler of the filler layer to perform non-impact water distribution; under the condition of not additionally adding a carbon source, the inflow water and the sulfur autotrophic denitrification bacteria growing on the surface of the filler are subjected to a sulfur autotrophic denitrification nitrogen removal reaction, and no sludge is generated; a reflux device is arranged at the bottom of the water storage unit, so that the sulfur autotrophic denitrification nitrogen removal reaction of the filler layer is not influenced by water quantity and water quality fluctuation.

Description

[0001] The original basis of this divisional application is the patent application with application number (202310951760.X), application date 2023.07.31, and invention name “A sewage purification system and method for facilities along highways”. Technical Field

[0002] The present invention relates to the technical field of sewage treatment, and in particular to a sewage deep purification device and method for reducing carbon emissions and water volume instability. Background Art

[0003] The rapid development of highways has also brought about corresponding environmental problems. Among them, sewage treatment in service areas has always been a key issue that has plagued highway operations and management. At present, the secondary treatment of sewage in highway service areas mostly uses contact oxidation, AO, and biological rotary disc methods. Due to the large fluctuations in water quality and water volume, low carbon-nitrogen ratio, and high nitrogen concentration of sewage in service areas, the secondary treatment has very limited removal of total nitrogen, and the total nitrogen in the effluent is still high, and it is mainly nitrate nitrogen. With the current concept of coordinated pollution reduction and carbon reduction in service areas, in order to realize the recycling of sewage resources in highway service areas, it is necessary to deeply treat the secondary effluent and reuse it for flushing toilets, greening, and other purposes in the service area.

[0004] Specifically, the amount of sewage in highway service areas is related to the number of vehicles passing through. Since the number of vehicles passing through service areas on holidays is 2 to 3 times that of ordinary working days, and the number of travelers has increased significantly. Therefore, the flow of people passing through highway service areas is 2 to 5 times that of working days. The amount of sewage generated in service areas on holidays peaks, and the amount of sewage generated in service areas on working days falls from the peak. Therefore, ordinary contact oxidation methods, AO methods, biological rotary methods, etc. are difficult to apply to service areas with large water volume fluctuations. If the water treatment scale is set large, it will fall into a state of low water treatment volume on working days, resulting in the death of some bacterial communities. If the water treatment scale is set according to 1.5 times the sewage treatment volume on working days, then on holidays, when a large amount of sewage is discharged, the bacterial community will not be able to completely remove nitrogen, reducing the efficiency of nitrogen removal.

[0005] At present, the deep treatment technologies for secondary effluent from highway service areas mostly use artificial wetlands, soil treatment, stabilization pond treatment and other technologies. Although they have a certain total nitrogen removal effect, the nitrogen required for plant growth is limited, the removal capacity of TN is not strong, and the above treatment technologies require a large area of ​​land, which is not the optimal solution.

[0006] In view of the above problems, the present invention uses sulfur autotrophic denitrification technology to construct a water storage device based on the deep treatment and self-purification of secondary effluent from highway service areas, so as to achieve deep treatment and recycling of secondary effluent, and further realize the recycling of sewage from highway service areas. The device is simple to operate, has high total nitrogen removal efficiency, small footprint and low operating cost, and has good economic benefits and practical significance.

[0007] For example, a Chinese patent with publication number CN206692523U discloses a sewage treatment system for a highway service station, including a septic tank, an oil-separating sedimentation tank, a grille tank, a regulating tank, a mobile bio-bed reactor, an MBR membrane tank, a disinfection tank, a sludge concentration tank, a filter press and a reuse water tank, wherein the sewage pipe of the highway service station is connected to the liquid inlet of the septic tank, the liquid outlet of the septic tank is connected to the liquid inlet of the oil-separating sedimentation tank, the liquid outlet of the oil-separating sedimentation tank is connected to the liquid inlet of the grille tank, the liquid outlet of the grille tank is connected to the first liquid inlet of the regulating tank, and the liquid outlet of the regulating tank is connected to the liquid outlet of the regulating tank. The inlet of the mobile biobed reactor is connected to the liquid inlet of the mobile biobed reactor, the liquid outlet of the mobile biobed reactor is connected to the liquid inlet of the MBR membrane pool, the liquid outlet of the MBR membrane pool is connected to the liquid inlet of the disinfection pool, the liquid outlet of the disinfection pool is connected to the liquid inlet of the reuse water pool, the sludge discharge port of the oil separation sedimentation tank and the sludge discharge port of the MBR membrane pool are both connected to the mud inlet of the sludge thickening tank, the discharge port of the sludge thickening tank is connected to the feed port of the filter press, the supernatant outlet of the sludge thickening tank and the filtrate discharge port of the filter press are connected to the second liquid inlet of the regulating tank. Although the utility model can avoid secondary pollution by pretreatment, biochemical treatment, and finally comprehensive treatment with membrane, the utility model consumes more resources and does not meet the development trend of reducing carbon emissions.

[0008] The present invention hopes to propose a sewage treatment system suitable for facilities along highways that can reduce carbon emissions.

[0009] In addition, 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 the present invention, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the present invention does not have the characteristics of these prior arts. On the contrary, the present invention already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology. Summary of the invention

[0010] The amount of sewage in highway service areas is related to the number of vehicles passing through. Since the number of vehicles passing through service areas on holidays is 2 to 3 times that of ordinary weekdays, the number of travelers has increased significantly, so the flow of people passing through highway service areas is 2 to 5 times that of weekdays. The amount of sewage generated in service areas on holidays peaks, and the amount of sewage generated in service areas on weekdays falls from the peak. Ordinary contact oxidation methods, AO methods, and biological rotary methods are difficult to apply to service areas with large water volume fluctuations. If the water treatment scale is set large, it will fall into a state of low water treatment volume on weekdays, resulting in the death of some bacterial communities. If the water treatment scale is set according to 1.5 times the sewage treatment volume on weekdays, then when holidays come, when a large amount of sewage is discharged, the bacterial community will not be able to completely remove nitrogen, reducing the efficiency of nitrogen removal.

[0011] Therefore, how to reasonably set up a sewage purification system in view of the large fluctuations in sewage water volume along the highway is a technical problem that has not yet been solved.

[0012] In view of the deficiencies of the prior art, the present invention provides a sewage purification system for facilities along a highway, which at least includes a main reaction unit. The main reaction unit is divided into a deep purification unit and a water storage unit in the longitudinal direction by a support plate. The deep purification unit is above the water storage unit. At least one filler layer in the deep purification unit is provided with microorganisms capable of performing sulfur autotrophic denitrification and denitrification reactions to achieve the decomposition of pollutants. The sulfur autotrophic denitrification process is an autotrophic reaction, which does not require an external carbon source and can stably achieve the removal of nitrogen in low carbon-nitrogen ratio sewage. In addition, the sulfur autotrophic denitrifying bacteria are autotrophic bacteria with a long reproduction cycle, which avoids the large-scale generation of residual sludge during operation and greatly reduces the operating cost.

[0013] The filler layer at least includes a material mixed with sulfur and calcium carbonate. During the operation of the sulfur autotrophic denitrification filter, the sulfur filler provides a sulfur source, and the calcium carbonate filler provides alkalinity as a slow-release filler, which together maintain the optimal alkalinity environment for the sulfur autotrophic denitrification microorganisms.

[0014] Preferably, the filling volume ratio of sulfur to calcium carbonate is 1 to 5: 2. Within this ratio range, no excess sludge is generated, and a reflux device is provided at the bottom of the water storage unit to prevent it from being affected by fluctuations in water volume and water quality.

[0015] Preferably, the deep purification unit and the water storage unit are respectively connected to the control unit and respond to the control instructions 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 a distance threshold and no request for recycled water is received, the control unit controls the third control valve to open so that part of the 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.

[0016] The present invention can realize the multifunctional linkage of water outlet, circulation, reuse, etc. of the device through automatic control of the water outlet, circulation, and reuse automatic control valves. The degree of automation is high, so that the stored water passes through the deep purification unit many times to realize circulation treatment, so that the water quality of the stored water is further improved.

[0017] Preferably, the purification system further comprises a water outlet unit, which comprises at least a lift 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 lift pump start-stop controller and the first control valve to open respectively, so as to realize water storage and reuse. Through water storage and reuse, purified water can be reused, further saving water resources.

[0018] In response to the request for water storage circulation treatment, the control unit controls the lift pump start-stop controller and the second control valve to open and controls the first control valve to close respectively, so as to realize the circulation treatment of the stored water. Through the circulation treatment of the stored water, when the sewage treatment volume decreases, there can be enough sewage to maintain the stability of the microbial flora, and the nitrogen removal effect of the sewage can be better.

[0019] Preferably, the system further comprises a liquid level control unit connected to the control unit, and the liquid level control unit comprises at least a float valve and a liquid level sensor. The liquid level sensor is connected to the float valve via a valve stem, and the control unit adjusts at least one valve in the water outlet unit based on the liquid level data sent by the liquid level sensor to control the liquid level of the water storage unit. By controlling the liquid level, the situation that the wastewater treatment of the packing layer is affected when too much water is stored is avoided, so that the efficiency of the wastewater treatment is kept stable.

[0020] Preferably, a pretreatment unit is also included, and the pretreatment unit is connected to the water distribution component. The pretreatment can filter out particulate matter in advance. The water distribution component is arranged in the water distribution area above the deep purification unit to distribute water to the packing layer in a non-impact manner. The non-impact water distribution can make the packing layer evenly laid and not affected by the impact of water flow, so as to maintain the stable environmental state of the microbial flora.

[0021] Preferably, an exhaust port is provided on the top of the main reaction unit, and the exhaust port is a one-way air port. The one-way air port can effectively prevent excessive inflow of external air and maintain a good oxygen-deficient environment inside the device.

[0022] Preferably, the filling volume ratio of sulfur to calcium carbonate is 1: 1. During the backwashing process, the mixing ratio of sulfur to calcium carbonate 1: 1 can ensure that the filler is mixed evenly and avoid uneven stratification of the filler caused by the backwashing operation.

[0023] The present invention also provides a method for purifying sewage from facilities along a highway, the method at least comprising: microorganisms capable of performing sulfur autotrophic denitrification and denitrification reactions are arranged in at least one packing layer in a deep purification unit to achieve the decomposition of pollutants. The packing layer at least comprises a material mixed with sulfur and calcium carbonate. The sulfur autotrophic denitrification process in the present invention is an autotrophic reaction, which does not require an external carbon source and can stably achieve the removal of nitrogen in low carbon-nitrogen ratio sewage. In addition, the sulfur autotrophic denitrifying bacteria are autotrophic bacteria with a long reproduction cycle, which avoids the large-scale generation of residual sludge during operation and greatly reduces the operating cost.

[0024] Preferably, the filling volume ratio of sulfur to calcium carbonate is 1 to 5: 2. Within this ratio range, no excess sludge is generated, and a reflux device is provided at the bottom of the water storage unit to prevent it from being affected by fluctuations in water volume and water quality.

[0025] Preferably, the method also includes: setting the deep purification unit higher than the water storage unit, and when the distance between the water storage unit and the bottom of the deep purification unit is less than a distance threshold, when no reuse water request is received, the control unit controls the third control valve to open so that part of the water is discharged, and 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] The present invention can realize the multifunctional linkage of water outlet, circulation, reuse, etc. of the device through automatic control of the water outlet, circulation, and reuse automatic control valves. The degree of automation is high, so that the stored water passes through the deep purification unit many times to realize circulation treatment, so that the water quality of the stored water is further improved.

[0027] The method of the present invention can achieve the functions of deep treatment, storage and reuse of secondary effluent from a high-speed service area through a single tank, shorten the process chain, reduce the floor space, and significantly reduce the cost of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Reference numerals list

[0030] 1: water inlet pipe; 2: water 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: lifting pump; 13: recycling pipe; 14: lifting pump start and stop controller; 15: first control valve; 16: check valve; 17: second control valve; 18: water outlet pipe; 19: water outlet; 20: third control valve; 21: exhaust port; 22: main reaction unit; 23: float valve; 24: valve stem; 25: liquid level sensor; 26: control unit. DETAILED DESCRIPTION

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

[0032] In the prior art, the service area sewage treatment mostly adopts the contact oxidation method, AO method, biological rotary method, etc., which makes it difficult for the total nitrogen content of the secondary effluent to meet the standard, and the main component of nitrogen is nitrate nitrogen. In order to further reduce the total nitrogen content, the prior art usually connects artificial wetlands, soil treatment and other technologies after the secondary treatment procedure of water. Although this can achieve a certain total nitrogen removal effect, due to the limited nitrogen required for plant growth, the removal capacity of TN is not strong, and the above treatment technology requires a large area. Alternatively, the prior art also adds a denitrification denitrification process in the secondary treatment process of sewage. However, because the carbon-nitrogen ratio in sewage is low, it is necessary to add a carbon source, which increases the treatment cost and increases the carbon emissions of the treatment process life cycle. None of the above prior arts are the optimal solutions for sewage treatment of facilities along the highway, and it is difficult to adapt to the characteristics of the sudden and rapid increase in the sewage treatment volume of the high-speed service area during holidays. In order to make up for the shortcomings of the prior art, the present invention improves the purification method of the deep purification unit, and adopts sulfur autotrophic denitrification technology to deeply treat the secondary effluent to improve the nitrogen removal efficiency.

[0033] Example 1

[0034] The sewage purification system for facilities along the highway of the present invention comprises at least a main reaction unit 22, a deep purification unit 7, a water storage unit 11, a water outlet unit and a control unit 26. The deep purification unit 7, the water storage unit 11 and the water outlet unit are respectively connected to the control unit 26 and respond to the control instructions of the control unit 26. The water inlet 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, a processor, a single-chip microcomputer, etc. that can execute the operating program of the method of the present invention.

[0036] like Figure 1 As shown, the main reaction unit 22 is an integrated device, and its interior is divided into a pretreatment unit 5, a deep purification unit 7 and a water storage unit 11 from high to low. The pretreatment unit 5 is arranged at a position higher than the deep purification unit 7. The deep purification unit 7 is arranged at a position higher than the water storage unit 11.

[0037] The pretreatment unit 5 is connected to the water inlet unit so that the untreated sewage can be discharged into the pretreatment unit 5 and pretreated. The water inlet unit at least includes an inlet pipe 1, a water inlet 2, a filter assembly 3 and a water distribution assembly 4. The water inlet 2 is arranged at the entrance of the pretreatment unit 5. The filter assembly 3 is arranged in the pretreatment unit 5 for filtering the incoming water. The filter assembly 3 is, for example, a filter plate, filter cotton, etc. The water outlet of the pretreatment unit 5 is connected to the water distribution assembly 4. The water distribution assembly 4 is preferably a pipe provided with dense water distribution holes. Preferably, the water distribution holes are arranged according to a certain rule, or the water distribution holes are evenly arranged.

[0038] Preferably, if Figure 1 As shown, the pretreatment unit 5 is arranged on the side of the deep purification unit 7, so that the water distribution component 4 can be arranged in the water distribution area 6 above the deep purification unit 7 to perform non-impact water distribution. Such an arrangement enables the water distribution component 4 to widely distribute the pretreated sewage in various areas on the surface of the deep water treatment unit 7 to avoid uneven sewage distribution. If the water distribution component 4 only distributes water in the same area, the area where water is distributed will cause structural deformation under the impact of water flow. Structural deformation is, for example, pits formed by impact. This will also lead to uneven distribution of bacterial species, which is not conducive to the long-term and extensive distribution of bacterial species, nor is it conducive to the activity of a large number of bacterial species.

[0039] Preferably, based on the liquid level difference between the pretreatment unit 5 and the deep purification unit 7, the water distribution component 4 is arranged in the water distribution area 6 in the vertical upper space of the deep purification unit 7, so that the incoming water can be evenly dispersed in the deep purification unit 7. Such an arrangement allows the incoming water to flow based on the action of gravity, reducing the use of power devices such as pumps and reducing energy consumption.

[0040] The secondary effluent is used as the inlet water and flows through the inlet pipe 1 into the water inlet 2 of the device by gravity or pressure lifting, and then passes through the filtering action of the filtering component 3 to further intercept the trace suspended impurities in the water, and finally flows into the water distribution component 4 by gravity for uniform water distribution.

[0041] Preferably, the deep purification unit 7 comprises at least a support plate 9, a packing layer 8 and at least one sampling hole 10. The support plate 9 is arranged in the main reaction unit 22 in a manner of dividing the main reaction unit 22 into the deep purification unit 7 and the water storage unit 11 in the longitudinal direction. The sampling hole 10 is arranged on the side wall of the deep purification unit 7 close to the support plate 9 to realize the replacement and replenishment of the packing.

[0042] Preferably, the packing layer 8 in the deep purification unit 7 comprises at least a material mixed with sulfur and calcium carbonate in a certain proportion. The filling volume ratio of sulfur to calcium carbonate is 1 to 5:2. The packing particle size is preferably: the particle size of the sulfur packing is 10 to 80 meshes. The particle size of the calcium carbonate packing is 10 to 80 meshes.

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

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

[0045] The volume of the packing layer is 30m 3 In the case of (硝态氮) =0~40mg / L.

[0046] The volume of the packing layer is 50m 3 In the case of (硝态氮) =40~100mg / L.

[0047] The volume of the packing layer is 100m 3 In the case of (硝态氮) =100~200mg / L.

[0048] Preferably, the volume of the packing layer is 30m 3 , the nitrate nitrogen concentration of the inlet water is 40 mg / L. Under the condition that the secondary sewage treatment in the service area operates normally, the total nitrogen in the effluent is below 40 mg / L. Therefore, the packing layer volume of the device of the present invention is 30m 3 It can meet the requirements of deep treatment and reuse of secondary effluent in the service area.

[0049] At present, contact oxidation, AO, and biological rotary disc methods are mostly used for sewage treatment in highway service areas. The above processes are all based on heterotrophic denitrification, that is, heterotrophic denitrifying microorganisms remove total nitrogen by consuming organic carbon sources in water. Due to the low carbon-nitrogen ratio and high nitrogen concentration of sewage in highway service areas, the total nitrogen in secondary effluent is difficult to meet the standard without an external carbon source, and the main component of nitrogen is nitrate nitrogen. In order to achieve the deep removal of nitrogen, one solution is to add additional organic carbon sources to supplement the carbon source demand required by the heterotrophic denitrification process. Long-term carbon source addition greatly increases the operating cost. In addition, there are problems such as inaccurate carbon source addition, excessive addition causing secondary pollution, and increased risk of effluent COD exceeding the standard. Therefore, it is necessary to deeply treat the secondary effluent.

[0050] At present, the deep treatment technologies for secondary effluent from highway service areas mostly use artificial wetlands, soil treatment, stabilization pond treatment and other technologies. Although they have a certain total nitrogen removal effect, the nitrogen required for plant growth is limited and the removal capacity of TN is not strong. Therefore, the above treatment technologies require a large area of ​​land.

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

[0052] The influent water of the system drips onto the packing of the packing layer 8 through the water distribution component 4, and flows through the packing surface of the packing layer from top to bottom, and undergoes a sulfur autotrophic denitrification reaction with the sulfur autotrophic denitrifying bacteria growing on the surface of the packing, thereby converting nitrate nitrogen in the water into nitrogen gas to achieve denitrification. The sulfur autotrophic denitrification reaction is: the sulfur autotrophic denitrifying bacteria use reduced sulfur as an electron donor to convert NO3 - -N or NO2 - -N is reduced to N2 and removed.

[0053] The advantage of using the packing layer 8 to remove nitrogen in the present invention is that the sulfur autotrophic denitrifying bacteria use the reduced sulfur as an electron donor to convert NO3 - -N or NO2 - -N is reduced to N2 for removal. The sulfur autotrophic denitrification process is an autotrophic reaction, which does not require an external carbon source and can stably achieve the removal of nitrogen in low carbon-nitrogen ratio sewage. In addition, sulfur autotrophic denitrifying bacteria are autotrophic bacteria with a long reproduction cycle, which avoids the large-scale generation of excess sludge during operation and greatly reduces operating costs.

[0054] When the sewage treatment volume suddenly increases during holidays and there is a short peak, the sulfur autotrophic denitrifying bacteria can reproduce rapidly and maintain a stable nitrogen removal capacity. When the sewage treatment volume drops rapidly on weekdays, the sulfur autotrophic denitrifying bacteria can also maintain their own nitrogen treatment capacity, and there will be no problem of a sudden decrease in sulfur autotrophic denitrifying bacteria and a decrease in nitrogen treatment capacity.

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

[0056] First, the preferred ratio of sulfur to calcium carbonate is 1:1, which is verified by a gradient test. During the operation of the sulfur autotrophic denitrification filter, the sulfur filler provides a sulfur source, and the calcium carbonate filler provides alkalinity as a slow-release filler, jointly maintaining the optimal alkalinity environment for sulfur autotrophic denitrifying microorganisms. At the same time, during the operation, the filler layer needs to be backwashed regularly to replace the fresh biofilm and ensure the high activity of the biofilm on the filler surface. During the backwashing process, the mixing ratio of sulfur and calcium carbonate of 1:1 can ensure that the filler is mixed evenly and avoid uneven stratification of the filler caused by the backwashing operation. Secondly, the mixing ratio of 1:1 can also ensure the synchronous consumption and replacement cycle of sulfur and calcium carbonate fillers, avoiding the waste of fillers due to mismatched operation consumption.

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

[0058] The water storage unit 11 at least includes a lift pump 12, a recycling pipe 13 and a lift pump start-stop controller 14. The lift pump 12 is arranged 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 through the recycling pipe 13 via the second control valve 17. A first control valve 15 and a check valve 16 are installed in sequence at one end of the recycling pipe 13 away from the lift pump 12 and the water distribution assembly 4. A second control valve 17 is arranged at one end of the water distribution assembly 4 near the recycling pipe 13. The second control valve 17 is used to control the circulation treatment of the stored water in the water storage unit 11.

[0059] Preferably, the device of the present invention further comprises a liquid level control unit. The liquid level control unit is connected to the control unit 26 in a wired and / or wireless manner. The liquid level control unit comprises at least a float valve 23 and a liquid level sensor 25. The liquid level sensor 25 is arranged in 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 sent by the liquid level sensor 25 to achieve the control of the liquid level of the water storage unit.

[0060] Preferably, the water outlet unit at least includes a boost 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 arranged on a side wall close to the bottom of the water storage unit 11. The third control valve 20 and the check valve 16 are arranged in sequence on the water outlet pipe 18 near one 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] The lift pump start-stop controller 14 is arranged on the lift pump 12. The second control valve 17 is arranged on the water distribution assembly 4 in the water inlet unit. The recycling pipe 13 is connected to the water distribution assembly 4 through the second control valve 17. In response to the recycling water request, the lift pump start-stop controller 14 is started, the control unit controls the first control valve 15 to open, and the second control valve 17 to close, so as to realize the storage water recycling.

[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 arranged at a position higher than the water storage unit 11. When the distance between the water storage unit 11 and the bottom of the deep purification unit 7 is less than the distance threshold, when no water reuse request is received, the control unit 26 controls the third control valve 20 to open so that part of the water is discharged, and 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 liquid level of the water storage unit 11 is less than the distance threshold from the bottom of the support plate 9, and the user has no demand for recycled water at this time, the third control valve 20 is opened, and the stored water is discharged. When the liquid level of the water storage unit 11 is lower than the set liquid level at the top of the lifting pump 12, the third control valve 20 is closed.

[0066] When the liquid level of the water storage unit 11 is less than the distance threshold from the bottom of the support plate 9, and the user has a demand for recycled water at this time, the lift pump start-stop controller 14 is started, the first control valve 15 is opened, and the second control valve 17 is closed to store water for reuse. 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, the lift pump start-stop controller 14 and the first control valve 15 are closed.

[0067] When the liquid level of the water storage unit 11 is greater than the distance threshold from the bottom of the support plate 9, and the user has no demand for recycled water at this time, the lift 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 or the user has a demand for recycled water.

[0068] With such arrangement, the device of the present invention is internally provided with water outlet, circulation, and reuse automatic control valves, etc., which can realize the multifunctional linkage of water outlet, circulation, and reuse of the device, with a high degree of automation and simple operation.

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

[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, an exhaust port 21 is provided at the top of the main reaction unit 22. The exhaust port is a one-way air port. The optimal working environment of sulfur autotrophic denitrifying bacteria is anoxic or anaerobic. Both aerobic or microaerobic state will inhibit the activity of sulfur autotrophic denitrifying bacteria and reduce its denitrification efficiency. The one-way air port can effectively avoid excessive inflow of external air and maintain a good anoxic environment inside the device.

[0072] Temperature and alkalinity can affect the sewage treatment efficiency of sulfur autotrophic denitrifying bacteria in the packing layer 8. Preferably, a temperature detection component and / or a pH detection component can also be adaptively provided in the deep purification unit 7 of the present invention. The type of temperature detection component is not limited, such as a waterproof water temperature detector, a water temperature sensor, etc. The pH detection component is, for example, a pH detector, etc. The optimum pH value of sulfur autotrophic denitrification is about 7.0. The temperature detection component and / or the pH detection component can be connected to the control unit 26 by wire or wireless means. The sewage treatment efficiency is evaluated based on the received temperature parameters and pH parameters and the pre-set treatment efficiency samples related to the temperature and pH parameters. Preferably, a heating component can also be adaptively provided in the deep purification unit 7. The heating component is, for example, an electric heating wire, an electric heater, etc., which is used to increase the temperature of the environment in the deep purification unit 7 to avoid the environment with too low temperature reducing the treatment efficiency of the bacterial community. The heating component is connected to the control unit 26 by wire or wireless means and 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 layer increases as the height of the sub-packing layer decreases. The temperature in the sub-packing layer is heated by a heating component, which is controlled and adjusted 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. Then, 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 of such a setting is that in order to save space for sewage treatment, the sewage treatment system is generally configured underground. The underground temperature is generally lower than the surface temperature. Moreover, the farther from the surface, the lower the temperature. The optimum temperature for sulfur autotrophic denitrification is around 30°C. Low temperature will inhibit the denitrification performance of the denitrifying bacteria system, thereby reducing the denitrification rate. In general, as the distance from the surface increases, the temperature of the second sub-packing layer tends to be low. Therefore, as the height of each sub-packing layer changes in a step-by-step manner, the temperature of each sub-packing layer also changes in a step-by-step manner to compensate for the temperature loss of the sub-packing layer with a lower height caused by the surrounding environment and maintain the stability of the activity of the sulfur autotrophic denitrifying bacteria in the sub-packing layer.

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

[0075] Example 2

[0076] This embodiment is a further improvement on Embodiment 1, and the repeated contents will not be repeated here.

[0077] The present invention provides a method for purifying sewage from facilities along a highway, the method at least comprising:

[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 the request for reused water, the control unit 26 controls the start-stop controller 14 of the lift pump to start, the first control valve 15 to open, and the second control valve 17 to close, so as to realize the storage water reuse. The first control valve 15 is arranged on the reuse pipe 13 in the water storage unit, and the second control valve 17 is arranged on the water distribution assembly 4 in the water inlet unit, and the reuse pipe 13 is connected to the water distribution assembly 4 through the second control valve 17.

[0080] The deep purification unit 7 is set higher than the water storage unit 11. When the distance between the water storage unit 11 and the bottom of the deep purification unit 7 is less than the distance threshold, when no water reuse request is received, the control unit 26 controls the third control valve 20 to open so that part of the water is discharged, and 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 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 demand for recycled water, the third control valve 20 is opened, and the stored water is discharged. 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, the third control valve 20 is closed.

[0082] When the liquid level of the water storage unit 11 is less than the distance threshold from the bottom of the support plate 9, and when the user has a demand for recycled water at this time, the lift pump start-stop controller 14 is started, the first control valve 15 is opened, and the second control valve 17 is closed to store water for reuse, and 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, the lift pump start-stop controller 14 and the first control valve 15 are closed.

[0083] When the distance between the liquid level of the water storage unit 11 and the bottom of the support plate 9 is greater than the distance threshold, and the user has a demand for reused water at this time, the booster pump start-stop controller 14 and the second control valve 17 are turned on to circulate the water in the water storage unit 11 (to achieve better water quality), and when the specified time is run or the user has a demand for reused water, the second control valve 15 is closed. With such a configuration, the device of the present invention is internally provided with water outlet, circulation, and reuse automatic control valves, etc., which can realize the multi-functional linkage of water outlet, circulation, and reuse of the device, with a high degree of automation and simple operation.

[0084] It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the present invention specification and its drawings are illustrative and do not constitute a limitation on the claims. The scope of protection of the present invention is defined by the claims and their equivalents. The present invention specification contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", all of which indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application based on each inventive concept.

Claims

1. A sewage deep purification device for reducing carbon emissions and water volume instability, comprising a main reaction unit (22) of a facility along a highway, wherein the main reaction unit (22) is divided into a deep purification unit (7) and a water storage unit (11) in the longitudinal direction by a support plate (9), characterized in that: The deep purification unit (7) is arranged at a position higher than the water storage unit (11), and the purified liquid is collected in the water storage unit (11); The deep purification unit (7) comprises a packing layer (8), the packing of the packing layer (8) comprises a material mixed with sulfur and calcium carbonate, and sulfur autotrophic denitrifying bacteria with a long reproduction period 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 incoming water drips onto the packing of the packing layer (8) to perform non-impact water distribution; in the absence of an external carbon source, the incoming water and the sulfur autotrophic denitrifying bacteria growing on the surface of the packing undergo a sulfur autotrophic denitrification reaction without generating sludge; A reflux device is arranged at the bottom of the water storage unit (11) so that the sulfur autotrophic denitrification reaction of the filler layer (8) is not affected by fluctuations in water quantity and water quality.

2. The sewage deep purification device according to claim 1, characterized in that: The pretreatment unit (5) is arranged at a position higher than the deep purification unit (7) so as to pretreat the sewage to be treated.

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

2.

4. The sewage deep purification device according to claim 3 is characterized in that: The packing layer (8) comprises at least two sub-packing layers arranged in a stepped manner; The temperature in the sub-filling layer increases as the height of the sub-filling layer decreases, so as to compensate for the temperature loss of the sub-filling layer with a lower height caused by the surrounding environment, and maintain the stability of the activity of the sulfur autotrophic denitrifying bacteria in the sub-filling layer.

5. The sewage 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 sewage 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 sewage deep purification device according to any one of claims 1 to 4, characterized in that: In the packing layer (8), a first height of a first sub-packing layer is higher than a second height of a 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 deep sewage purification with reduced carbon emissions and water volume instability, the method comprising: The main reaction unit (22) of the highway facility is divided into a deep purification unit (7) and a water storage unit (11) in the longitudinal direction by a support plate (9), characterized in that: The deep purification unit (7) is arranged at a position higher than the water storage unit (11), and the purified liquid is collected in the water storage unit (11); The deep purification unit (7) comprises a filler layer (8), the filler of the filler layer (8) comprises a material mixed with sulfur and calcium carbonate, and sulfur autotrophic denitrifying bacteria with a long reproduction period grow on the surface of the filler; The water distribution assembly (4) is arranged in the water distribution area (6) above the deep purification unit (7), so that the incoming water drips onto the filler of the filler layer (8) to perform non-impact water distribution; in the absence of an external carbon source, the incoming water and the sulfur autotrophic denitrifying bacteria growing on the surface of the filler undergo a sulfur autotrophic denitrification reaction without generating sludge; A reflux device is arranged at the bottom of the water storage unit (11) so that the sulfur autotrophic denitrification reaction of the filler layer (8) is not affected by fluctuations in water quantity and water quality.

9. The method for deep purification of sewage according to claim 8, characterized in that: The method further comprises: in the packing layer (8), a first height of a first sub-packing layer is higher than a second height of a 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.

10. The method for deep purification of sewage according to claim 9, characterized in that: The filling volume ratio of the sulfur to the calcium carbonate is 1 to 5:2.

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