A wastewater treatment system for tunnel air purification station

Abstract

The present invention relates to the field of wastewater treatment technology, and specifically to a wastewater treatment system for a tunnel air purification station. The present invention integrates a multi-parameter water quality sensor in the filter box for obtaining various water quality parameters, a flow rate regulator for obtaining flow rate data and controlling the flow rate, and a water level sensor for obtaining water level changes, thereby realizing real-time monitoring and intelligent regulation of water quality, flow rate and water level. The current treatment requirements of the wastewater in the tunnel air purification station are judged according to the water quality parameters, and the flow rate is preliminarily adjusted; then, combined with the change in the water level height, the flow rate is further finely adjusted to ensure the wastewater treatment effect. The invention not only improves the wastewater treatment efficiency, but also ensures the stability of the treatment effect by accurately regulating the flow rate of the water outlet of the filter box by comprehensively adjusting multiple factors.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a wastewater treatment system for a tunnel air purification station. Background Art

[0002] During the operation of tunnel air purification stations, a large amount of wastewater will be generated, which mainly comes from tunnel cleaning, equipment cleaning and possible rainwater infiltration. These wastewaters usually contain a variety of pollutants such as suspended solids, organic matter, and fine particulate impurities. If they are not effectively treated and discharged directly, they will cause serious pollution to the surrounding environment. Therefore, tunnel air purification stations need to be equipped with efficient and reliable wastewater treatment systems.

[0003] In the existing wastewater treatment system of tunnel air purification stations, sedimentation tanks are usually used to separate particulate impurities in wastewater to achieve the purpose of water purification. However, since sedimentation tanks mainly rely on physical sedimentation to remove suspended solids, and the wastewater of tunnel air purification stations contains a large number of fine particles, which have poor sedimentation effect in liquids, only sedimentation of wastewater in sedimentation tanks to achieve the purpose of water purification will result in poor water quality and poor water purification effect. Summary of the invention

[0004] In order to solve the technical problem that the wastewater of the tunnel air purification station contains a large amount of fine particles, which have a poor sedimentation effect in the liquid, and only sedimenting the wastewater in the sedimentation tank will make the final purified water have poor water quality and poor water purification effect, the purpose of the present invention is to provide a wastewater treatment system for the tunnel air purification station, and the technical scheme adopted is as follows:

[0005] The present invention proposes a wastewater treatment system for a tunnel air purification station, wherein a multi-parameter water quality sensor is installed in a water collection and distribution box, the water collection and distribution box is connected to a first filter box through a water distribution pipe, the water outlet of the first filter box is connected to a second filter box through the water distribution pipe, and a flow rate regulator is installed at the connection, the first filter box contains a water level sensor and a filter material, the multi-parameter water quality sensor is used to obtain real-time data of various water quality parameters in the water collection and distribution box, the water level sensor is used to obtain real-time data of water level height in the first filter box, the flow rate regulator is used to obtain real-time data of flow rate of water at the water outlet of the first filter box, and adjust the flow rate of water at the water outlet of the first filter box; a wastewater treatment method of the tunnel air purification station is implemented according to the real-time data of various water quality parameters, the real-time data of water level height and the real-time data of flow rate, wherein the wastewater treatment method of the tunnel air purification station comprises:

[0006] Determine the target water quality status based on the real-time data of various water quality parameters at the current moment;

[0007] Under the target water quality state, the water in the water collection and distribution box is transported to the first filter box, and the first water flow rate adjustment factor at the water outlet of the first filter box is determined based on the real-time data of various water quality parameters at the current moment; the second water flow rate adjustment factor at the water outlet of the first filter box is determined based on the real-time data of the water level height;

[0008] The real-time flow rate data is adjusted according to the first water body flow rate adjustment factor and the second water body flow rate adjustment factor to obtain a water body corrected flow rate; the flow rate of the flow rate regulator at the water outlet of the first filter box is controlled based on the water body corrected flow rate to perform wastewater treatment;

[0009] The real-time data of water quality parameters include at least: water turbidity and suspended solids content;

[0010] The method for obtaining the first water body flow rate adjustment factor includes:

[0011] The difference between the turbidity of the water body and the preset turbidity standard value is used as the first deviation value, the difference between the suspended solid content and the preset suspended solid standard value is used as the second deviation value, the sum of the first deviation value and the second deviation value is used as the deviation degree value, and the deviation degree value is numerically adjusted based on the hyperbolic tangent function to obtain an adjustment parameter;

[0012] The difference between the positive integer 1 and the adjustment parameter is used as the first water body flow rate adjustment factor;

[0013] The method for obtaining the second water body flow rate adjustment factor includes:

[0014] The difference between the real-time water level data and the preset water level value is used as a height deviation value, and the height deviation value is numerically adjusted based on a hyperbolic tangent function to obtain a height adjustment factor;

[0015] The sum of the positive integer 1 and the height adjustment factor is used as the second water body flow rate adjustment factor.

[0016] Furthermore, the target water quality state is determined according to the real-time data of various water quality parameters at the current moment, including:

[0017] Determining the turbidity index of the water body in the water collection and distribution box according to the value of the water body turbidity and the preset turbidity standard value;

[0018] Determining the suspended solids index of the water body in the water collection and distribution box according to the suspended solids content and the value of the preset suspended solids standard value;

[0019] When the turbidity index satisfies a preset first condition, or the suspended matter index satisfies a preset second condition, it is determined that the water in the water collection and distribution box is in a target water quality state.

[0020] Furthermore, the method for obtaining the corrected flow velocity of the water body includes:

[0021] Taking the average of the first water body flow rate adjustment factor and the second water body flow rate adjustment factor as the adjustment degree value;

[0022] The product of the adjustment degree value and the real-time flow velocity data is used as the corrected flow velocity of the water body.

[0023] Furthermore, the method of controlling the flow rate of the flow rate regulator at the water outlet of the first filter box based on the corrected flow rate of the water body to perform wastewater treatment includes:

[0024] The flow rate of the flow rate regulator at the water outlet of the first filter box at the next moment is set to the water body correction flow rate at the current moment, and the water body in the first filter box is controlled in real time;

[0025] Under real-time flow rate control, the water in the first filter box is subjected to wastewater filtration treatment based on the filter material in the first filter box, and the water is transported to the second filter box through the water distribution pipe between the first filter box and the second filter box.

[0026] Furthermore, the method for obtaining the turbidity index includes:

[0027] The value after normalization of the ratio between the turbidity of the water body and the preset turbidity standard value is used as the turbidity index.

[0028] Furthermore, the method for obtaining the suspended matter index includes:

[0029] The value after normalization of the ratio between the suspended solid content and the preset suspended solid standard value is used as the suspended solid index.

[0030] A wastewater treatment method for a tunnel air purification station, the method further comprising:

[0031] Acquire real-time data of various water quality parameters in the water collection and distribution box, acquire real-time data of water level height in the first filter box, and acquire real-time data of flow velocity of the water body at the water outlet of the first filter box.

[0032] The present invention has the following beneficial effects:

[0033] The present invention installs a multi-parameter water quality sensor in the water collection and distribution box, installs a flow rate regulator at the water outlet of the first filter box, and installs a water level sensor in the first filter box. The multi-parameter water quality sensor can obtain real-time data of water quality parameters of the water body in the water collection and distribution box; the flow rate regulator can obtain real-time data of the flow rate of the water body and can adjust the flow rate of the water body at the water outlet; and the water level sensor is used to obtain real-time data of the water level height. According to the real-time data of water quality parameters, the current water body treatment requirements and water quality status are judged, and then it is determined whether the water body is in the target water quality state. When it is in the target water quality state, the water body in the water collection and distribution box is transported to the first filter box. Since the content of various water quality parameters in the water body at this time will affect the effect of wastewater treatment, the flow rate at the water outlet can be preliminarily adjusted based on the various water quality parameters in the water body to obtain the first water body flow rate adjustment factor. Furthermore, when the water level in the first filter box changes, in order to avoid the water level change beyond the controllable range that may cause the sediment on the filter material to be suspended again, thereby affecting the wastewater treatment effect, it is necessary to adjust the flow rate at the water outlet again based on the real-time data of the water level to obtain the second water body flow rate adjustment factor. Finally, the real-time flow rate data is adjusted based on the first water body flow rate adjustment factor and the second water body flow rate adjustment factor to determine the corrected flow rate of the water body, and the flow rate of the flow rate regulator at the water outlet of the first filter box is controlled, so as to realize wastewater treatment in the first filter box. In summary, the present invention comprehensively considers multiple factors such as water quality parameters, water level height and flow rate, and realizes precise control of the water outlet flow rate. This control method can not only ensure the treatment effect of wastewater, but also improve the overall treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of a test structure of a wastewater treatment system for a tunnel air purification station provided by one embodiment of the present invention;

[0036] Figure 2 A method flow chart of a wastewater treatment method for a tunnel air purification station provided by one embodiment of the present invention;

[0037] Figure 3 A flow chart of a method for determining a target water quality state provided by an embodiment of the present invention.

[0038] Figure markings: 1-flocculation tank, 2-sedimentation tank, 3-sludge outlet, 4-water outlet weir, 5-water collection and distribution box, 6-first water distribution pipe, 7-water level sensor, 8-first connecting pipe, 9-first filter box, 10-nozzle for cleaning, 11-filter material, 12-valve, 13-second water distribution pipe, 14-second filter box, 15-activated carbon filter plate, 16-flow rate regulator, 17-third water distribution pipe, 18-second connecting pipe, 19-clean water tank, 20-water outlet, 21-multi-parameter water quality sensor. DETAILED DESCRIPTION

[0039] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation, structure, features and effects of a wastewater treatment system for a tunnel air purification station proposed by the present invention in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0040] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0041] The following is a detailed description of a specific scheme of a wastewater treatment system for a tunnel air purification station provided by the present invention in conjunction with the accompanying drawings.

[0042] See also Figure 1 , which shows a simplified diagram of the test structure of a wastewater treatment system for a tunnel air purification station provided by an embodiment of the present invention.

[0043] The wastewater treatment process can be briefly described as:

[0044] Step 1: In the flocculation tank 1, the wastewater generated by the tunnel air purification station is fully mixed and reacted with the liquid medicine in the flocculation tank, so that the suspended particles and colloidal substances in the wastewater are aggregated into larger flocs. Then, the reacted wastewater flows into the sedimentation tank 2. The formed flocs sink to the bottom of the sedimentation tank under the action of gravity to form sludge, which is discharged through the sludge outlet 3 at the bottom of the sedimentation tank. The remaining water is discharged through the outlet weir 4 and enters the water collection and distribution box 5.

[0045] Step 2: A plurality of multi-parameter water quality sensors 21 are installed in the water collection and distribution box 5 to obtain real-time data of various water quality parameters in the water collection and distribution box, and the water collection and distribution box is connected to the first filter box 9 and the second filter box 14 respectively through the first water distribution pipe 6 and the second water distribution pipe 13. The first filter box 9 has a built-in water level sensor 7 and a filter material 11. The water level sensor 7 is used to obtain real-time data of the water level height in the first filter box 9. The filter material 11 is used to filter the water in the first filter box 9. The water outlet of the first filter box 9 is a third water distribution pipe 17 between the second filter box 14. A flow rate regulator 16 is installed to obtain real-time data of the flow rate of the water at the water outlet of the first filter box 9 and to adjust the flow rate. The water flow rate at the outlet of the first filter box 9 determines the water quality state in the water collection and distribution box according to the real-time data of various water quality parameters. When the water quality state meets the target water quality state, the valve 12 between the water collection and distribution box 5 and the first filter box 9 is opened to allow the water in the water collection and distribution box 5 to enter the first filter box 9, and the flow rate regulator 16 is used to control the flow rate according to the real-time data of the water level height and the real-time data of the flow rate in the first filter box 9, so as to realize the wastewater treatment method for the tunnel air purification station, wherein the target water quality state is when the water turbidity and the suspended solids content in the real-time data of the water quality parameters in the water collection and distribution box 5 meet the preset conditions, that is, when the water in the water collection and distribution box 5 is relatively turbid and has more suspended solids.

[0046] Step 3: When the water quality in the water collection and distribution box 5 does not meet the target water quality, the water in the water collection and distribution box 5 enters the second filter box 14 through the second water distribution pipe 13; and when the water quality in the water collection and distribution box 5 meets the target water quality, after being treated by the wastewater treatment method of the tunnel air purification station, the water in the first filter box 9 is transported to the second filter box 14 through the third water distribution pipe 17. The water is filtered through the activated carbon filter plate 15 in the second filter box 14 to effectively remove pollutants such as organic matter, chlorine, and heavy metals in the water, and the treated water is transported to the clean water tank 19 through the second connecting pipe 18 between the second filter box 14 and the clean water tank 19, and finally discharged through the water outlet 20.

[0047] It should be noted that valves should be installed at all water distribution pipes and connecting pipes, and the valves should be controlled by controllers to open when needed and close when not needed. Figure 1 Only the valve at the water distribution pipe connecting the water collection and distribution box and the first filter box 9 is specially marked.

[0048] The main purpose of the present invention is to deal with the situation where the wastewater of the tunnel air purification station still contains a large amount of fine particles after the suspended solids are removed by physical sedimentation in the sedimentation tank. Therefore, the wastewater treatment method for the tunnel air purification station in the second step mentioned above is mainly described.

[0049] See also Figure 2 , which shows a method flow chart of a wastewater treatment method for a tunnel air purification station provided by an embodiment of the present invention, the method comprising the following steps:

[0050] Step S1: obtaining real-time data of various water quality parameters in the water collection and distribution box, obtaining real-time data of water level height in the first filter box, and obtaining real-time data of flow velocity of the water body at the water outlet of the first filter box.

[0051] In the daily operation of the tunnel air purification station, a considerable amount of wastewater is generated, the main sources of which include deep cleaning operations inside the tunnel, regular maintenance and cleaning of equipment, and possible natural factors such as rainwater infiltration. These wastewaters are complex in composition, containing high concentrations of suspended solids, various organic matter, and impurities such as fine particles, and their pollution load is significant. If they are directly discharged into the environment without proper and efficient treatment procedures, they will inevitably pose a significant pollution threat to the surrounding ecosystems and water resources, and damage the health and balance of the natural environment.

[0052] The prior art uses a sedimentation tank to separate impurity particles in wastewater to achieve the purpose of water purification. However, since there may be a large number of fine particles, oil substances, etc. in the wastewater, fine particles with a particle size smaller than a certain size will not settle if only treated in a sedimentation tank, so that the sedimentation tank cannot achieve a good water purification effect. Therefore, in an embodiment of the present invention, a filter box is added in the subsequent process of the sedimentation tank, and the wastewater is deeply filtered using high-efficiency filter materials. Since the flow rate of the water body is closely related to the filtering effect, during the filtration process of the water body, the flow rate of the water body is controlled to achieve a better purification process of the water body.

[0053] First, various substance contents in the water are acquired through multiple multi-parameter water quality sensors installed in the water collection and distribution box to obtain real-time data of various water quality parameters, including water turbidity, suspended solid content, heavy metal ions and chemical oxygen demand at the current moment. Since multiple multi-parameter water quality sensors are installed at different positions in the water collection and distribution box, the data of various substance contents acquired by all water quality sensors at the current moment can be averaged as the real-time water quality parameter data of various substance contents at the current moment. That is, the real-time water quality parameter data characterizes the overall situation of the substance content in the water body at different positions in the water collection and distribution box at the current moment, and can more accurately characterize the water quality status in the water collection and distribution box.

[0054] Then, the real-time data of the water level height in the first filter box at the current moment is obtained based on the water level sensor in the first filter box. This data can effectively represent the water capacity in the first filter box at the current moment, which is of great significance for adjusting the water flow rate. Then, the real-time data of the flow rate of the water at the water outlet in the first filter box at the current moment is obtained through the flow rate sensor at the water outlet in the first filter box.

[0055] It should be noted that, in the embodiment of the present invention, the time interval for data sampling can be set to 1s, and the specific time interval can be adjusted according to the implementation scenario and is not limited here.

[0056] Step S2: Determine the target water quality state according to the real-time data of various water quality parameters at the current moment.

[0057] After obtaining the real-time data of various water quality parameters of the water body in the water collection and distribution box, the current water quality status can be determined based on these data and combined with standard indicators of wastewater treatment, which can serve as the basis for subsequent treatment process adjustment and optimization, and the target water quality status can be screened for subsequent operation processes.

[0058] Preferably, in one embodiment of the present invention, the process of determining the target water quality state includes:

[0059] See also Figure 3 , which shows a method flow chart of a method for determining a target water quality state in an embodiment of the present invention, the method comprising the following steps:

[0060] Step S201: Determine the turbidity index of the water body in the water collection and distribution box according to the turbidity of the water body and the value of the preset turbidity standard value.

[0061] When the turbidity of the water body is greater than the preset turbidity standard value, the turbidity of the water body is considered to be high. Conversely, when the turbidity of the water body is less than the preset turbidity standard value, the turbidity of the water body is considered to be low. Therefore, the ratio between the turbidity of the water body and the preset turbidity standard value is normalized and used as the turbidity index of the water body in the water collection and distribution box. The larger the turbidity index is, the more turbid the water body in the water collection and distribution box is, which means that there are more fine particles in the water body, and the closer it is to the target water quality state, and it needs to be transported to the first filter box for subsequent filtration treatment of the fine particles therein.

[0062] It should be noted that the normalization process can be performed as follows: The normalization function of the above is used, and the specific normalization process is not limited or elaborated here; the preset turbidity standard value can refer to the national, local or industry water quality standards, and can also be determined according to the actual wastewater purification requirements. In this embodiment of the present invention, the turbidity standard value is set to 5, and the specific value is not limited or elaborated here.

[0063] Step S202: Determine the suspended solid index of the water body in the water collection and distribution box according to the suspended solid content and the preset suspended solid standard value.

[0064] When the suspended solids content is greater than the preset suspended solids standard value, it is considered that there are more suspended solids in the water body. Conversely, when the suspended solids content is less than the preset suspended solids standard value, it is considered that there are less suspended solids in the water body. Therefore, the ratio between the suspended solids content and the preset suspended solids standard value is normalized and used as the suspended solids index of the water body in the water collection and distribution box. The larger the suspended solids index is, the more fine particles are present in the water collection and distribution box, the more turbid the water body is, and the closer it is to the target water quality state. It is necessary to transport it to the first filter box for subsequent filtration treatment of the fine particles therein.

[0065] It should be noted that the normalization process can be performed as follows: The normalized function of the above is not limited or elaborated on in detail. The preset suspended solids standard value may refer to the national, local or industry water quality standards, or may be determined according to the actual wastewater purification requirements. In this embodiment of the present invention, the suspended solids standard value is set to 30, and the specific value is not limited or elaborated on in detail.

[0066] Step S203: Determine the target water quality state based on the turbidity index and the suspended matter index.

[0067] If the turbidity index satisfies a preset first condition, it is deemed that the target water quality state is met in terms of water turbidity, wherein the preset first condition is that the turbidity index is greater than a preset first threshold.

[0068] If the suspended matter index meets the preset second condition, it is deemed that the target water quality state is met in terms of suspended matter in the water body, wherein the preset second condition is that the suspended matter index is greater than a preset second threshold value.

[0069] Finally, when at least one of the above two requirements is met, it is considered that the water in the current water collection and distribution tank is in the target water quality state.

[0070] It should be noted that the preset first threshold value is 0.4, and the second threshold value is 0.4. The specific values ​​can be adjusted according to the implementation scenario and are not limited here.

[0071] At this point, by analyzing the real-time data of various water quality parameters of the water body in the water collection and distribution box, it can be determined whether the water body in the water collection and distribution box meets the target water quality state, so as to continue the subsequent processing process.

[0072] Step S3: Under the target water quality state, the water in the water collection and distribution box is transported to the first filter box, and the first water flow rate adjustment factor at the water outlet of the first filter box is determined based on the real-time data of various water quality parameters at the current moment; the second water flow rate adjustment factor at the water outlet of the first filter box is determined based on the real-time data of the water level height.

[0073] Since the target water quality state indicates that the water in the water collection and distribution box has too high turbidity or too much suspended matter, it means that it contains a large amount of fine particles, so it needs to be filtered. For fine particles, high-efficiency filter materials can be used to deeply filter the wastewater, such as quartz sand, fiber filter material, ceramic filter material, ultrafiltration membrane, nanofiltration membrane, etc. In the embodiment of the present invention, a sand filter plate is used as the built-in filter material in the first filter box, and the selection of specific filter materials is not limited here. Since the flow rate of the water body will affect the filtering effect, in the first filter box, the first water body flow rate adjustment factor is obtained based on the current water quality state; at the same time, since the water level height is an important indicator reflecting the change of water body capacity and flow rate in the filter box, the second water body flow rate adjustment factor is determined based on the real-time data of the water level height. In the subsequent process, the water body flow rate in the first filter box can be corrected by the first water body flow rate adjustment factor and the second water body flow rate adjustment factor, thereby effectively improving the filtering effect of the first filter box.

[0074] Therefore, when the water in the water collection and distribution box is in the target water quality state, the valve between the water collection and distribution box and the first filter box is opened to allow the water in the water collection and distribution box to flow into the first filter box, and then based on the real-time data of various water quality parameters at the current moment, the first water flow rate adjustment factor at the outlet of the first filter box is determined.

[0075] Preferably, in one embodiment of the present invention, the method for obtaining the first water body flow rate adjustment factor includes:

[0076] Water turbidity and suspended solids content are important indicators of water quality. Turbidity indicates the clarity or turbidity of water, while suspended solids content is directly related to the amount of suspended particles in the water. These particles may be carriers of organic matter, bacteria, viruses and other microorganisms, and have a direct impact on water quality.

[0077] Therefore, the difference between the turbidity of the water body and the preset turbidity standard value is taken as the first deviation value, and similarly, the difference between the suspended solids content and the suspended solids standard value is taken as the second deviation value. The sum of the first deviation value and the second deviation value is taken as the deviation degree value, which comprehensively reflects the water quality of the current water body. Since the deviation degree value may be positive or negative, and the hyperbolic tangent function is a monotonic function, the deviation degree value is numerically adjusted based on the hyperbolic tangent function to obtain the adjustment parameter, which provides data support for the subsequent flow rate adjustment.

[0078] Flow rate is one of the key factors affecting the filtration effect. Too high a flow rate may lead to insufficient filtration, while too low a flow rate will increase the processing time. Therefore, the difference between the positive integer 1 and the adjustment parameter is used as the first water body flow rate adjustment factor. The formula model of the first water body flow rate adjustment factor includes:

[0079]

[0080] in, represents the first water body flow rate adjustment factor; Indicates the turbidity of water; Indicates the preset turbidity standard value; Indicates the suspended solids content; Indicates the preset suspended solids standard value; represents the hyperbolic tangent function.

[0081] In the formula model of the first water body flow rate adjustment factor, the difference between the water body turbidity and the preset turbidity standard value is calculated as the first deviation value When the value is positive and the larger the value is, the higher the current water turbidity is and the greater the degree of its higher than the standard value is. On the contrary, when the value is negative and the smaller the value is, the lower the current water turbidity is and the greater the degree of its lower than the standard value is. Similarly, the difference between the suspended solids content and the suspended solids standard value is calculated as the second deviation value. When the value is positive and the larger the value is, the higher the suspended solids content in the current water body is, and the greater the degree to which it is higher than the standard value is. On the contrary, when the value is negative and the smaller the value is, the lower the suspended solids content in the current water body is, and the greater the degree to which it is lower than the standard value is. When the turbidity of the water body is high and the suspended solids content is high, the water flow rate should be reduced so that the water body can fully contact the filter material, thereby improving the filtration effect. On the contrary, when the turbidity of the water body is low and the suspended solids content is low, the water flow rate should be increased so that the water body can pass quickly, thereby improving the filtration efficiency. Therefore, the two are comprehensively analyzed and the sum value is used as the deviation degree value. , and use the hyperbolic tangent function to numerically adjust the deviation value to obtain the adjustment parameter of the water flow velocity , the value range is (-1, 1). At this time, when the adjustment parameter is a positive value and the larger the value is, the flow rate should be reduced. On the contrary, when the adjustment parameter is a negative value and the smaller the value is, the flow rate should be increased. Based on the above analysis, the difference between the preset positive number 1 and the adjustment parameter is used as the first water body flow rate adjustment factor, and the value range is (0, 2). At this time, when the adjustment parameter is a positive value, the flow rate should be reduced, and the value of the first water body flow rate adjustment factor is less than 1. On the contrary, when the adjustment parameter is a negative number, the flow rate should be increased, and the value of the first water body flow rate adjustment factor is greater than 1.

[0082] It should be noted that in this embodiment of the present invention, the positive integer is set to 1 in order to prevent over-adjustment of the flow rate. In other embodiments of the present invention, the preset positive number can also be adjusted according to the actual value of the adjustment parameter, which is not limited here.

[0083] After obtaining the first water body flow rate adjustment factor based on the water quality conditions, since the water level height in the first filter box can reflect the water body capacity, flow rate changes, etc. in the first filter box at the current moment, the real-time water level height data can be analyzed here to determine the second water body flow rate adjustment factor at the outlet of the first filter box.

[0084] Preferably, in one embodiment of the present invention, the method for obtaining the second water body flow rate adjustment factor includes:

[0085] The preset water level height value is usually an ideal or target water level set based on safety, efficiency or other factors. Therefore, the difference between the real-time water level height data and the preset water level height value is used as the height deviation value. Since the height deviation value may be positive or negative, the hyperbolic tangent function is used to numerically adjust the height deviation value, and the adjusted value is used as the height adjustment factor; the height adjustment factor characterizes the difference between the current water level height in the first filter box and the target water level.

[0086] Finally, the sum of the positive integer 1 and the height adjustment factor is used as the second water body flow rate adjustment factor. The formula model of the second water body flow rate adjustment factor includes:

[0087]

[0088] in, represents the flow rate adjustment factor of the second water body; Indicates real-time data of water level height; Indicates the preset water level height value; represents the hyperbolic tangent function.

[0089] In the formula model of the second water body flow rate adjustment factor, the difference between the real-time water level height data and the preset water level height value is calculated as the height deviation value When the height deviation value is a positive number, it means that the current water level is higher than the preset water level value. In this case, it is considered that the amount of water in the first filter box is too large, which may easily cause the sediment on the filter material to be suspended again, thus affecting the filtering effect. Therefore, the flow rate at the outlet of the first filter box should be increased. On the contrary, when the height deviation value is a negative number, it means that the current water level is lower than the preset water level value. In this case, the flow rate can be appropriately reduced to maintain a stable filtering effect. Given that the hyperbolic tangent function can limit the value to between (-1, 1) and is monotonically increasing, the hyperbolic tangent function is used to calculate the height deviation value. Make numerical adjustments and use the adjusted values ​​as height adjustment factors ; At this time, when the height adjustment factor is a positive value and is closer to 1, it means that the water flow rate should be increased. Conversely, when the height adjustment factor is a negative value and is closer to -1, the water flow rate should be reduced. Based on the above logic, the height adjustment factor and the second water flow rate adjustment factor should be positively correlated, so the sum of the preset positive number 1 and the height adjustment factor is used as the second water flow rate adjustment factor, and the value range is (0, 2), that is, when the flow rate should be reduced, the value of the second water flow rate adjustment factor is less than 1, and conversely, when the flow rate should be increased, the value of the second water flow rate adjustment factor is greater than 1.

[0090] It should be noted that in this embodiment of the present invention, the positive integer is set to 1 in order to prevent over-adjustment of the flow rate. In other embodiments of the present invention, the preset positive number can also be adjusted according to the actual value of the height adjustment factor, which is not limited here; the preset water level height value is set to two-thirds of the height of the first filter box rounded up, and the specific value can be adjusted according to the implementation scenario, which is not limited here.

[0091] So far, by analyzing the water quality and water level height respectively, two adjustment factors for adjusting the water flow rate are obtained: the first water flow rate adjustment factor and the second water flow rate adjustment factor. In the subsequent process, the water flow rate at the outlet of the first filter box can be adaptively adjusted based on these two flow rate adjustment factors, thereby improving the filtering effect.

[0092] Step S4: adjusting the real-time flow rate data according to the first water body flow rate adjustment factor and the second water body flow rate adjustment factor to obtain a corrected water body flow rate; controlling the flow rate of the flow rate regulator at the outlet of the first filter box based on the corrected water body flow rate to perform wastewater treatment.

[0093] Based on step S3, the first water body flow rate adjustment factor and the second water body flow rate adjustment factor can be obtained. These two indicators are used to correct the water body flow rate at the water outlet of the first filter box to obtain the water body correction flow rate, which can make the water filtering effect in the first filter box better. Finally, the flow rate of the flow rate regulator at the water outlet of the first filter box is regulated based on the water body correction flow rate, thereby realizing wastewater treatment.

[0094] Preferably, in one embodiment of the present invention, the method for obtaining the corrected flow velocity of a water body includes:

[0095] Since the value range of the first water body flow velocity adjustment factor is (0, 2), and the value of the first water body flow velocity adjustment factor is less than 1, the flow velocity should be reduced, otherwise, the value of the first water body flow velocity adjustment factor is greater than 1, and the flow velocity should be increased. Similarly, the value range of the second water body flow velocity adjustment factor is (0, 2), and when the flow velocity should be reduced, the value of the second water body flow velocity adjustment factor is less than 1, and when the flow velocity should be increased, the value of the second water body flow velocity adjustment factor is greater than 1.

[0096] Therefore, the average of the first water body flow rate adjustment factor and the second water body flow rate adjustment factor is used as the adjustment degree value, and finally the product of the adjusted value and the real-time flow rate data is used as the water body corrected flow rate. The formula model of the water body corrected flow rate can be specifically, for example:

[0097]

[0098] in, Indicates the corrected flow velocity of water; Indicates real-time data of flow rate; represents the first water body flow rate adjustment factor; Represents the flow rate adjustment factor of the second water body.

[0099] In the formula model of water body corrected flow rate, calculate the sum of the first water body flow rate adjustment factor and the second water body flow rate adjustment factor At this time, the sum value is (0, 4). The value is greater than 1, and the larger it is, the more the flow rate needs to be adjusted. On the contrary, the value is less than 1, and the smaller it is, the more the flow rate needs to be adjusted. However, in order to prevent over-adjustment during the adjustment process, the average of the first water body flow rate adjustment factor and the second water body flow rate adjustment factor is used as the adjustment degree value. At this time, the adjustment degree value range is between (0, 2). At this time, the value is greater than 1, and the larger it is, the more it needs to adjust the flow rate in a larger direction so that the water in the first filter box can pass quickly and improve the filtration efficiency; on the contrary, the value is less than 1, and the smaller it is, the more it needs to adjust the flow rate in a smaller direction so that the water in the first filter box can be fully filtered and the filtration effect can be improved. Finally, the product of the adjusted adjustment degree value and the real-time flow rate data is used as the water body correction flow rate.

[0100] At this point, the water flow rate has been adjusted according to the water quality status and water level at the current moment, and the corrected water flow rate has been obtained. The corrected water flow rate at this time is more suitable for the operation requirements of the current wastewater treatment system, and can more effectively cope with the influence of different water quality conditions and water level changes on the treatment effect.

[0101] Based on the water body correction flow rate, the water body flow rate can be adjusted in real time by accurately controlling the flow rate regulator at the outlet of the first filter box. This precise control helps to ensure that the treatment system can maintain a stable treatment effect under different working conditions and improve the efficiency and quality of wastewater treatment.

[0102] Preferably, in one embodiment of the present invention, the flow rate of the flow rate regulator at the water outlet of the first filter box is controlled based on the corrected flow rate of the water body to perform wastewater treatment, including:

[0103] The flow rate of the flow rate regulator at the water outlet of the first filter box at the next moment is set as the water body correction flow rate at the current moment to perform real-time flow rate control.

[0104] Under real-time flow rate control, the water in the first filter box is subjected to wastewater filtration treatment based on the filter material in the first filter box, and the water is transported to the second filter box through the water distribution pipe between the first filter box and the second filter box.

[0105] At this point, the filtration of fine particles in the wastewater of the tunnel air purification station is completed.

[0106] It should be noted that, in order to facilitate calculation, all indicator data involved in the calculation in the embodiment of the present invention are preprocessed to eliminate the dimension effect. The specific means of eliminating the dimension effect are technical means well known to those skilled in the art and are not limited here.

[0107] In the second filter box, the water is filtered using an activated carbon filter plate to effectively remove pollutants such as organic matter, chlorine, and heavy metals in the water. The treated water is transported to the clean water tank through the connecting pipe between the second filter box and the clean water tank, and is finally discharged through the outlet.

[0108] In the present invention, the filter material and the activated carbon filter plate need to be replaced regularly. The specific replacement frequency can be adjusted according to the actual situation, or the filter material can be cleaned by using the cleaning nozzle in the first filter box for reuse. When cleaning the filter material, keep the first filter box closed, and then when the cleaning is completed, the water body is transported to the sedimentation tank 2 through the first connecting pipe 8 for sedimentation, and then the subsequent operation process is carried out.

[0109] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0110] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A wastewater treatment system for a tunnel air purification station, characterized in that: A multi-parameter water quality sensor is installed in the water collection and distribution box, the water collection and distribution box is connected to the first filter box through a water distribution pipe, the water outlet of the first filter box is connected to the second filter box through the water distribution pipe, and a flow rate regulator is installed at the connection, the first filter box contains a water level sensor and a filter material, the multi-parameter water quality sensor is used to obtain real-time data of various water quality parameters in the water collection and distribution box, the water level sensor is used to obtain real-time data of water level height in the first filter box, the flow rate regulator is used to obtain real-time data of flow rate of the water body at the water outlet of the first filter box, and adjust the flow rate of the water body at the water outlet of the first filter box; according to the real-time data of various water quality parameters, the real-time data of water level height and the real-time data of flow rate, the wastewater treatment method of the tunnel air purification station is implemented, wherein the wastewater treatment method of the tunnel air purification station includes: Determine the target water quality status based on the real-time data of various water quality parameters at the current moment; Under the target water quality state, the water in the water collection and distribution box is transported to the first filter box, and the first water flow rate adjustment factor at the water outlet of the first filter box is determined based on the real-time data of various water quality parameters at the current moment; the second water flow rate adjustment factor at the water outlet of the first filter box is determined based on the real-time data of the water level height; The real-time flow rate data is adjusted according to the first water body flow rate adjustment factor and the second water body flow rate adjustment factor to obtain a water body corrected flow rate; the flow rate of the flow rate regulator at the water outlet of the first filter box is controlled based on the water body corrected flow rate to perform wastewater treatment; The real-time data of water quality parameters include at least: water turbidity and suspended solids content; The method for obtaining the first water body flow rate adjustment factor includes: The difference between the turbidity of the water body and the preset turbidity standard value is used as the first deviation value, the difference between the suspended solid content and the preset suspended solid standard value is used as the second deviation value, the sum of the first deviation value and the second deviation value is used as the deviation degree value, and the deviation degree value is numerically adjusted based on the hyperbolic tangent function to obtain an adjustment parameter; The difference between the positive integer 1 and the adjustment parameter is used as the first water body flow rate adjustment factor; The method for obtaining the second water body flow rate adjustment factor includes: The difference between the real-time water level data and the preset water level value is used as a height deviation value, and the height deviation value is numerically adjusted based on a hyperbolic tangent function to obtain a height adjustment factor; The sum of the positive integer 1 and the height adjustment factor is used as the second water body flow rate adjustment factor; Determining the target water quality state according to the real-time data of various water quality parameters at the current moment includes: Determining the turbidity index of the water body in the water collection and distribution box according to the value of the water body turbidity and the preset turbidity standard value; Determining the suspended solids index of the water body in the water collection and distribution box according to the suspended solids content and the value of the preset suspended solids standard value; When the turbidity index satisfies a preset first condition, or the suspended matter index satisfies a preset second condition, it is determined that the water in the water collection and distribution box is in a target water quality state.

2. A wastewater treatment system for a tunnel air purification station according to claim 1, characterized in that: The method for obtaining the water body corrected flow velocity comprises: Taking the average of the first water body flow rate adjustment factor and the second water body flow rate adjustment factor as the adjustment degree value; The product of the adjustment degree value and the real-time flow velocity data is used as the corrected flow velocity of the water body.

3. A wastewater treatment system for a tunnel air purification station according to claim 1, characterized in that: The method of controlling the flow rate of the flow rate regulator at the water outlet of the first filter box based on the water body correction flow rate to perform wastewater treatment includes: The flow rate of the flow rate regulator at the water outlet of the first filter box at the next moment is set to the water body correction flow rate at the current moment, and the water body in the first filter box is controlled in real time; Under real-time flow rate control, the water in the first filter box is subjected to wastewater filtration treatment based on the filter material in the first filter box, and the water is transported to the second filter box through the water distribution pipe between the first filter box and the second filter box.

4. A wastewater treatment system for a tunnel air purification station according to claim 1, characterized in that: The method for obtaining the turbidity index comprises: The value after normalization of the ratio between the turbidity of the water body and the preset turbidity standard value is used as the turbidity index.

5. A wastewater treatment system for a tunnel air purification station according to claim 1, characterized in that: The method for obtaining the suspended matter index includes: The value after normalization of the ratio between the suspended solid content and the preset suspended solid standard value is used as the suspended solid index.

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