A tunnel inner anti-slope drainage sewage cleaning system

Abstract

The utility model discloses a kind of tunnel inside inverted slope drainage's sewage cleaning system, it is related to sewage treatment technical field, the sewage cleaning system includes the shunt water guide device being provided with clean water outlet and contaminated water outlet, the clean water collection unit being communicated with clean water outlet, and the sewage pretreatment system being communicated with contaminated water outlet;The sewage pretreatment system includes oil separation and sedimentation device and filter device sequentially arranged along water flow direction, and sewage booster pump is equipped at the end of filter device;Oil separation and sedimentation device is arranged in multiple baffles for prolonging hydraulic retention time and can promote oil-water separation, and filter module for intercepting suspended pollutants is provided in filter device.The shunt structure provided by the utility model avoids the problem that all water bodies need high-standard treatment in traditional combined drainage in practical application, greatly reduces subsequent sewage treatment load, reduces processing cost, and simultaneously improves water resource utilization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sewage treatment technology, specifically a sewage cleaning system for reverse slope drainage in tunnels. Background Technology

[0002] In highway and railway tunnel engineering, the water components that the reverse slope drainage system needs to treat are complex, mainly including two categories: one is clean water (such as fire-fighting wastewater and structural leakage water), which has relatively good water quality; the other is polluted water (such as road runoff and vehicle accident leaks), which contains a large amount of oil, suspended particulate matter, heavy metal ions, and organic matter. Traditional tunnel drainage systems adopt a "combined clean and polluted water" design, collecting all water bodies and directly pumping or treating them uniformly, which has the following water quality treatment-related defects: (1) Low treatment efficiency: When clean water is mixed with high-concentration polluted water, the overall water quality deteriorates, requiring high-standard treatment processes (such as deep filtration and biochemical treatment), which increases water treatment costs and energy consumption. (2) Incomplete removal of pollutants: Oil, suspended solids and other impurities in combined water bodies are prone to accumulate in pipes and treatment equipment, reducing the operating efficiency of treatment units (such as filter beds and membrane modules) and even causing blockages; (3) Ecological pollution: Direct discharge of polluted water without targeted pretreatment or into subsequent treatment systems may lead to excessive discharge of pollutants and cause ecological impact on receiving water bodies; (4) Waste of water resources: Clean water cannot be directly reused due to the mixing of pollutants (such as tunnel washing and greening irrigation), which violates the water treatment principle of "saving water and reducing emissions".

[0003] Based on the above, there is an urgent need for a water treatment system that can achieve "classified collection and graded treatment". By separating clean water from polluted water, the water treatment process can be optimized in a targeted manner to improve the utilization rate of polluted water and reduce the treatment cost of backslope water, while realizing the recycling of water resources. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a sewage treatment system for reverse slope drainage in tunnels, so as to achieve efficient separation and graded treatment of clean water and polluted water, and improve sewage treatment efficiency and resource utilization level.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A sewage cleaning system for reverse slope drainage in a tunnel includes a diversion and diversion device with a clean water outlet and a polluted water outlet, a clean water collection unit connected to the clean water outlet, and a sewage pretreatment system connected to the polluted water outlet. The wastewater pretreatment system includes an oil-water separation and sedimentation device and a filtration device arranged sequentially along the water flow direction, and a wastewater lift pump is provided at the end of the filtration device; the oil-water separation and sedimentation device is equipped with multiple baffles to extend the hydraulic residence time and promote oil-water separation, and the filtration device is equipped with a filtration module for intercepting suspended pollutants.

[0006] Furthermore, it also includes a water collection ditch; the clean water collection unit is a clean water collection tank, the sewage pretreatment system is set at the end of the polluted water outlet, and the diversion and guiding device is connected to the water collection ditch.

[0007] Furthermore, the diversion and guiding device is an automatic diversion device or a vortex separation diversion well; the top of the water collection ditch is provided with a top cover, and multiple water inlet grate holes are opened on the top cover.

[0008] Furthermore, a rotary mechanical bar is installed between the polluted water outlet and the wastewater pretreatment system.

[0009] Furthermore, an oil collection tank with a matching oil skimmer is provided on top of the oil separation and sedimentation device.

[0010] Furthermore, the filtration module is a movable filter plate composed of multiple layers of grids for intercepting suspended pollutants.

[0011] Furthermore, the bottom of both the clean water collection tank and the oil-water separator is conical, and a submersible pump is installed.

[0012] Furthermore, the cross-sections of the clean water outlet, the polluted water outlet, and the water collection ditch are all rectangular or U-shaped, and the depth and width of the polluted water outlet are greater than those of the clean water outlet.

[0013] Furthermore, a clean water lift pump is installed inside the clean water collection tank, and the clean water lift pump is connected to an external treatment system or discharge point through a first drain pipe.

[0014] Furthermore, a second drainage pipe is installed to connect the sewage lift pump to an external sewage treatment system or discharge point.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) This utility model achieves the separation of clean water and polluted water by setting up a diversion and guiding device. The clean water can be directly reused or discharged after being lifted by the clean water collection tank; the polluted water is sequentially intercepted by the screen, separated by oil sedimentation and filtered for pretreatment, and then transported to the external sewage treatment system by the sewage lift pump. This design avoids the problem that all water bodies in the traditional combined sewer system need to be treated to a high standard, greatly reduces the subsequent sewage treatment load, reduces treatment costs, and improves water resource utilization efficiency.

[0016] (2) This utility model ensures drainage reliability through multi-level protection: the inlet grate at the top of the water collection ditch intercepts larger solid debris, and the rotary mechanical bar at the polluted water outlet automatically removes large floating objects to prevent pipe blockage; the polluted water outlet, due to its greater depth and width, can accommodate more polluted water, avoiding siltation that affects drainage capacity; the bottom of the clean water collection tank and the oil-water separator is designed with a cone shape and equipped with a submersible pump, facilitating the regular cleaning of deposited impurities and sludge. These measures together ensure the stable operation of the system during the flood season or in the event of a sudden accident, significantly reducing the risk of tunnel flooding.

[0017] (3) The wastewater pretreatment system of this utility model uses a graded treatment process to efficiently purify polluted water: the baffle plate of the oil separator forms a zigzag water flow path, prolonging the hydraulic residence time, promoting oil-water separation and particulate matter sedimentation, and the top oil collection tank, together with the oil skimmer, removes floating oil; the multi-layer grid movable filter plate of the filter device further intercepts smaller suspended solids. Through the above pretreatment, the content of pollutants such as oil and suspended solids in the polluted water is significantly reduced, reducing the impact of discharge on the environment and effectively improving the environmental protection of tunnel drainage. Attached Figure Description

[0018] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a schematic diagram of the wastewater pretreatment system in this utility model.

[0019] The corresponding names of the attached figures are as follows: 1-Clean water outlet, 2-Polluted water outlet, 3-Diversion and guiding device, 4-Clean water collection tank, 5-Sewage pretreatment system, 6-Oil separator and sedimentation device, 7-Filtration device, 8-Filtration module, 9-Sewage lift pump, 10-Clean water lift pump, 11-Inlet grate, 12-Baffle plate, 13-Tunnel, 14-Rotating mechanical bar, 15-Water flow channel, 16-First drain pipe, 17-Second drain pipe, 18-Water collection ditch. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0021] This utility model provides a cleaning system for reverse slope drainage in tunnels, such as... Figure 1As shown, adding a diversion device and a sewage treatment system to the existing drainage structure can effectively classify and collect backslope water and treat polluted water, thereby improving the utilization rate of polluted water and reducing the treatment cost of backslope water. The cleaning and sewage system provided by this utility model includes a water collection ditch 18, a diversion device 3, a clean water collection tank 4, and a sewage pretreatment system 5. The diversion device 3 is connected to the water collection ditch 18, and its output end is equipped with a clean water outlet 1 and a polluted water outlet 2. Through the function of the diversion device 3, the initial polluted rainwater and the middle and later clean water can be efficiently separated. The clean water is finally collected through the clean water collection tank 4 and lifted to an external treatment system or discharge point, while the polluted water is discharged after preliminary treatment through the sewage pretreatment system 5, thereby significantly reducing sewage treatment costs and improving the reliability and environmental performance of the drainage system.

[0022] Water collection ditches 18 are installed in tunnel 13. One or more can be installed, either on both sides of the tunnel surface or on one edge. Each ditch has an inlet grate 11 at its top for uniformly collecting runoff from the tunnel surface. The inlet grate 11 not only ensures smooth water flow into the drainage ditch but also effectively intercepts larger solid debris, preventing blockage of the drainage system. Clean water outlet 1 and contaminated water outlet 2 are located on both sides or one edge of the tunnel surface. Clean water outlet 1 is mainly used to collect the mid-to-late stage clean water after separation by the diversion device 3. Its cross-section is rectangular or U-shaped, providing good drainage capacity and ease of construction. Contaminated water outlet 2 is deeper and wider than clean water outlet 1 to accommodate initial rainwater containing more suspended solids and pollutants, while preventing a decrease in drainage capacity due to siltation. The design of contaminated water outlet 2 fully considers the actual drainage needs of the tunnel, maintaining efficient drainage performance even under high flow conditions.

[0023] The diversion and guiding device 3 is located at the end of the water collection ditch 18. Its function is to guide the initial polluted rainwater into the polluted water outlet 2 and the mid-to-late stage clean water into the clean water outlet 1. The diversion and guiding device 3 is an automatic diversion device or a vortex separation diversion well. When the automatic diversion device is used, the device monitors the water flow in real time through a built-in flow sensor. For example, it can be set to guide the gate or diversion valve to the polluted water outlet 2 within the first 5-15 minutes after the start of rainfall (or before the cumulative flow reaches a certain threshold), and to identify the initial rainwater as sewage and guide it. When the preset time or flow rate is reached, it automatically switches to the clean water outlet 1 channel. When the vortex separation diversion well is used, its well body is equipped with a tangential inlet and a guide plate that forms a vortex. Centrifugal force is used to cause denser particles and some oil to settle and separate along the well wall to the bottom sewage chamber. The water that has been preliminarily purified overflows into the clean water outlet 1 through the middle conduit; the less dense pollutants enter the polluted water outlet 2 from another outlet with the initial rainwater. The diversion and water guiding device 3 is designed with full consideration of the complexity and variability of the tunnel drainage system, and can adapt to the drainage needs under different working conditions.

[0024] The clean water collection tank 4 is located in a water collection pit or pump room at the bottom (or side) of the tunnel, and is connected to the end of the clean water outlet 1. It is used to collect the clean water after diversion. The clean water collection tank 4 is equipped with a clean water lift pump 10, which is controlled by a liquid level float switch. When the water level in the tank reaches the high level, it automatically starts and lifts the clean water to the corresponding treatment system outside the tunnel or directly discharges it through the first drain pipe 16. In addition, a submersible sludge pump is also installed at the bottom of the clean water collection tank 4 to periodically clean the small amount of impurities deposited at the bottom of the tank, preventing siltation problems during long-term operation.

[0025] The wastewater pretreatment system 5 is also located in the equipment space at the bottom of the tunnel, adjacent to the clean water collection tank 4, and connected to the polluted water outlet 2 via pipes, for preliminary treatment of initial polluted rainwater. Figure 2 As shown, the wastewater pretreatment system 5 is equipped with an oil-water separator and sedimentation device 6 and a filter device 7 arranged sequentially along the water flow direction. A rotary mechanical screen 14 is installed between the polluted water outlet 2 and the wastewater pretreatment system 5. The rotary mechanical screen 14 is existing technology and mainly consists of a drive device, a rake tooth mechanism, and a cleaning mechanism. The rotary mechanical screen 14 is used to continuously and automatically intercept large floating and suspended solids (such as plastic bags, leaves, stones, etc.) in the wastewater. The intercepted screen residue is automatically scooped into the slag collection tank by the rotating rake, effectively avoiding clogging and wear of subsequent treatment units.

[0026] The oil-water separator / sedimentation device 6 is installed after the rotary mechanical bar screen 14 to further separate oil and water and settle particulate matter in the wastewater intercepted by the bar screen. It contains multiple baffles 12, forming a zigzag water flow path, forcing the water flow to turn multiple times in the vertical direction, extending the hydraulic residence time, and promoting oil to float and particulate matter to settle. An oil collection tank is located at the top of the oil-water separator / sedimentation device 6, and an oil skimmer is installed as a floating oil collection device to periodically or continuously remove surface-accumulated oil. The bottom of the oil-water separator / sedimentation device 6 is designed as a cone shape and equipped with a submersible pump to facilitate the periodic discharge of deposited sludge.

[0027] A filter device 7 is installed after the oil-water separator and sedimentation device 6, and the two are connected by a water flow channel 15. The filter device 7 contains a filter module 8, which is a multi-layered, movable filter plate used to intercept smaller suspended solids and is easy to clean and replace periodically. Water flowing from the polluted water outlet 2 to the wastewater pretreatment system 5 is first intercepted by a rotary mechanical screen 14 to remove large floating and suspended solids, then enters the oil-water separator and sedimentation device 6. Under the action of the baffle plate 12, oil and water are fully separated, and particulate matter settles. The water then flows into the filter device 7 through the water flow channel 15. A wastewater lift pump 9 is installed at the end of the filter device 7, also managed by a level controller. Finally, the pre-treated wastewater is lifted to the wastewater treatment system or discharge point outside the tunnel through the second drain pipe 17. By setting up the wastewater pretreatment system 5, the difficulty and cost of subsequent wastewater treatment can be significantly reduced, and the environmental performance of the entire drainage system can be improved.

[0028] In actual operation: Runoff from the tunnel surface enters the water collection ditch 18, which is installed on both sides or one side of the road surface, through the inlet grate 11. The diversion and guiding device 3, based on the water flow characteristics and water quality, directs the initial polluted rainwater to the polluted water outlet 2, while directing the mid-to-late stage clean water to the clean water outlet 1. The clean water flows through the clean water outlet 1 into the clean water collection tank 4 at the bottom of the tunnel, and is then pumped by the clean water lift pump 10 to an external treatment system or directly discharged. The polluted water flows through the polluted water outlet 2 into the sewage pretreatment system 5, also located at the bottom of the tunnel. After preliminary separation of oil and particulate matter in the oil-water separator and sedimentation device 6, it enters the filtration device 7 for further filtration. Finally, the pre-treated sewage is pumped by the sewage lift pump 9 to an external sewage treatment system or discharge point. The entire operation is efficient and reliable, significantly reducing sewage treatment costs and improving the operating efficiency of the drainage system.

[0029] The cleaning and sewage system of this invention has significant advantages in construction and maintenance. The water collection ditch 18, clean water outlet 1, and polluted water outlet 2 are all arranged along the tunnel sidewalls, with a simple cross-sectional design, convenient construction, and adjustable dimensions according to actual needs. The diversion and guiding device 3 reduces the need for manual intervention and lowers operating costs. The centralized arrangement of the clean water collection tank 4 and sewage pretreatment system 5 within the tunnel equipment space makes maintenance more convenient, especially the movable design of the filter module 8, which facilitates regular cleaning and replacement. Furthermore, the submersible pump effectively solves the problem of sedimentation at the bottom of the tank, further extending the service life of the clean water collection tank 4.

[0030] Based on the above, this utility model achieves the functions of separating clean water from sewage and providing preliminary sewage treatment within the tunnel through the coordinated operation of the water collection ditch 18, the diversion and guiding device 3, the clean water collection pool 4, and the sewage pretreatment system 5. This structure not only significantly reduces sewage treatment costs and improves the reliability and operational efficiency of the drainage system, but also reduces water waste, thus possessing significant engineering application value.

[0031] The above embodiments are merely one of the preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but solve the same technical problem as this utility model, should be included within the scope of protection of this utility model.

Claims

1. A sewage cleaning system with reverse slope drainage in tunnels, characterized in that, It includes a diversion and guiding device (3) with a clean water outlet (1) and a polluted water outlet (2), a clean water collection unit connected to the clean water outlet (1), and a sewage pretreatment system (5) connected to the polluted water outlet (2). The wastewater pretreatment system (5) includes an oil-water separation and sedimentation device (6) and a filtration device (7) arranged sequentially along the water flow direction, and a wastewater lift pump (9) is provided at the end of the filtration device (7); the oil-water separation and sedimentation device (6) is provided with multiple baffles (12) for extending the hydraulic residence time and promoting oil-water separation, and the filtration device (7) is provided with a filtration module (8) for intercepting suspended pollutants.

2. The tunnel reverse slope drainage and sewage cleaning system according to claim 1, characterized in that, It also includes a water collection ditch (18); the clean water collection unit is a clean water collection pool (4), the sewage pretreatment system is set at the end of the polluted water outlet (2), and the diversion and guiding device (3) is connected to the water collection ditch (18).

3. A tunnel reverse slope drainage system for cleaning and decontamination according to claim 2, characterized in that, The diversion and guiding device (3) is an automatic diversion device or a vortex separation diversion well; the top of the water collection ditch (18) is provided with a top cover, and multiple water inlet grate holes (11) are opened on the top cover.

4. A tunnel reverse slope drainage system for cleaning and decontamination according to claim 3, characterized in that, A rotary mechanical bar screen (14) is installed between the polluted water outlet (2) and the sewage pretreatment system (5).

5. A tunnel reverse slope drainage system for cleaning and decontamination according to claim 4, characterized in that, An oil collection tank with a matching oil scraper is provided on the top of the oil separation and sedimentation device (6).

6. A sewage cleaning system for reverse slope drainage in a tunnel according to claim 5, characterized in that, The filtration module (8) is a movable filter plate composed of multiple layers of grids for intercepting suspended pollutants.

7. A tunnel reverse slope drainage system for cleaning and decontamination according to claim 6, characterized in that, The bottom of the clean water collection tank (4) and the oil separator (6) are both conical, and a submersible pump is installed.

8. A sewage cleaning system for reverse slope drainage in a tunnel according to claim 7, characterized in that, The cross-sections of the clean water outlet (1), the polluted water outlet (2), and the water collection ditch (18) are all rectangular or U-shaped, and the depth and width of the polluted water outlet (2) are greater than those of the clean water outlet (1).

9. A sewage cleaning system for reverse slope drainage in a tunnel according to claim 8, characterized in that, The clean water collection tank (4) is equipped with a clean water lift pump (10), and the clean water lift pump (10) is connected to an external treatment system or discharge point through a first drain pipe (16).

10. A tunnel reverse slope drainage system for cleaning and decontamination according to claim 9, characterized in that, The sewage lift pump (9) is connected to an external sewage treatment system or discharge point by setting a second drain pipe (17).

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