Ecological environment-friendly treatment method for tunnel sewage

Abstract

The invention relates to the technical field of sewage treatment, and particularly discloses a tunnel sewage ecological environment-friendly treatment method which comprises the following steps: S1, arranging a plurality of water collecting bins along a tunnel; sewage pumping and draining equipment is installed in the tunnel face and the water collecting bin; s2, a plurality of MBR sewage treatment devices are installed outside the tunnel, and a clean water tank is arranged; s3, pumping and draining equipment in the tunnel face and all the water collecting bins is started, sewage of the tunnel face is pumped and drained upwards step by step to all the water collecting bins, and finally the sewage is injected into MBR sewage treatment equipment; and S4, treating the sewage by the MBR sewage treatment equipment, and discharging the treated clear water into a clear water tank. By the adoption of the technical scheme, the tunnel drainage water quality can be effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to an ecological and environmentally friendly treatment method for tunnel sewage. Background Art

[0002] With the rapid development of railway and highway construction in my country, tunnel projects account for an increasing proportion. At the same time, the wastewater generated by tunnel construction has also increased.

[0003] Tunnel wastewater primarily originates from fissure water in the rock formation during tunnel excavation, wastewater generated by the compaction of excavated soil by large construction equipment, and wastewater from shotcrete and grouting. This wastewater is alkaline and contains high concentrations of suspended solids (SS), small amounts of chemical oxygen demand (COD), and other pollutants such as petroleum. If not promptly treated, these pollutants can seriously pollute the surrounding ecological environment. Currently, tunnel wastewater treatment generally involves the construction of three-stage sedimentation tanks, which fail to effectively meet current ecological wastewater discharge standards and can easily disrupt the local ecological balance.

[0004] Therefore, an ecological and environmentally friendly tunnel sewage treatment method is needed that can effectively ensure the water quality of tunnel drainage. Summary of the Invention

[0005] The present invention provides an ecological and environmentally friendly method for treating tunnel sewage, which can effectively ensure the water quality of tunnel drainage.

[0006] In order to solve the above technical problems, this application provides the following technical solutions:

[0007] A method for ecological and environmentally friendly treatment of tunnel sewage, comprising the following steps:

[0008] S1. Set up several water collection tanks along the tunnel; install sewage pumping equipment at the tunnel face and in the water collection tanks;

[0009] S2. Install several MBR sewage treatment equipment outside the tunnel and set up a clear water tank;

[0010] S3. Start the pumping and drainage equipment in the tunnel face and each water collection tank, pump the sewage from the tunnel face upward to each water collection tank step by step, and finally inject it into the MBR sewage treatment equipment;

[0011] S4. MBR sewage treatment equipment treats sewage and discharges the treated clean water into the clean water tank.

[0012] Furthermore, the MBR sewage treatment equipment includes a regulating tank, an anaerobic tank, an MBR reaction tank, and a sludge tank;

[0013] The sewage is injected into the regulating tank, and then pumped to the anaerobic tank for treatment through the submersible sewage pump in the regulating tank. After treatment, it flows into the MBR reaction tank, and air is introduced into the MBR reaction tank through the blower; the water filtered by the MBR membrane is pumped out by the suction pump, and discharged into the clear water tank after adding chemicals;

[0014] The residue in the MBR reaction tank is pumped into the sludge tank through the sludge pump installed at the bottom of the MBR reaction tank, so that the clean water in the sludge tank flows back to the regulating tank.

[0015] Furthermore, in step S3, water volume change data of the water collection tank closest to the tunnel face is collected, the water inflow of the current tunnel face is analyzed based on the water volume change data, and the number of MBR sewage treatment equipment to be started is determined based on the water inflow of the tunnel face.

[0016] Furthermore, in step S3, the water inflow Q is calculated as:

[0017]

[0018] Among them, ΔV is the water level change in the water collection tank, and Δt is the sampling interval;

[0019] Obtain the preset rated sewage treatment capacity of a single MBR sewage treatment equipment, and determine the number of MBR sewage treatment equipment to be started based on the inflow volume and the sewage treatment capacity of a single MBR sewage treatment equipment.

[0020] Furthermore, the step S2 further includes setting up an emergency regulating pool outside the tunnel;

[0021] When the amount of water inflow exceeds the sewage treatment capacity of all current MBR sewage treatment equipment, the sewage in the tunnel will be first injected into the emergency regulating tank, and then injected into the MBR sewage treatment equipment from the emergency regulating tank.

[0022] Furthermore, the method further includes step S5 of testing the water quality in the clear water tank and generating a water quality test report.

[0023] Furthermore, in step S3, the type of sewage in the water collection tank closest to the tunnel face is detected, and different types of sewage are discharged into different MBR sewage treatment equipment for treatment; the sewage types include blasting wastewater, mechanical flushing water, and tunnel face water.

[0024] This solution utilizes pumping equipment to progressively transport face wastewater to the MBR sewage treatment facility outside the tunnel. Using modular MBR treatment units, water quality and quantity are balanced in a regulating tank before entering an anaerobic tank for organic matter degradation. Subsequently, aeration-enhanced biological treatment and membrane separation synergize in the MBR reactor to achieve deep removal of pollutants such as suspended solids and COD. The activated sludge generated during the treatment process is returned to the regulating tank through a dedicated channel, forming a biomass recycling mechanism. This effectively improves treatment efficiency, ensures water quality, and eliminates pollution risks to the surrounding ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a flow chart of Example 1 of an ecological and environmentally friendly method for treating tunnel sewage;

[0026] Figure 2 This is a schematic diagram of the MBR sewage treatment equipment in Example 1 of an ecological and environmentally friendly tunnel sewage treatment method. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] Example 1

[0029] like Figure 1 As shown, a tunnel sewage ecological and environmental treatment method of this embodiment includes the following steps:

[0030] S1. Set up several water collection tanks along the tunnel, and install sewage pumping equipment on the heading face and in the water collection tanks. In this embodiment, the water collection tanks are formed by excavating chambers on the side walls of the tunnel. The water collection tanks are mainly used for reverse slope drainage, and the sewage pumping equipment uses water pumps. In other embodiments, if the drainage is on the positive slope, a drainage channel can be directly built.

[0031] S2. Install several MBR sewage treatment plants outside the tunnel, along with a clear water tank and an emergency regulating tank. The number of MBR sewage treatment plants is determined by the rated treatment capacity of each MBR plant and the estimated drainage volume of the current tunnel geological structure. In this embodiment, containerized MBR sewage treatment plants are used to facilitate transportation to the next construction site for continued use after the current tunnel construction is completed, thus saving costs.

[0032] S3. Start the pumping and drainage equipment in the tunnel face and each water collection tank to discharge the sewage from the tunnel face upward through the pipe to the nearest water collection tank. The sewage is then pumped upward step by step by each water collection tank and finally injected into the MBR sewage treatment equipment. In this embodiment, the water discharged from the tunnel is connected to the emergency regulating tank and each MBR sewage treatment equipment through several first pipes. At the same time, a water pump is installed in the emergency regulating tank, and the water pump is connected to the injection port of each MBR sewage treatment equipment through a second pipe.

[0033] This embodiment also installs a water level sensor in the water collection tank closest to the tunnel face to collect water volume change data in the water collection tank closest to the tunnel face, analyzes the current water inflow of the tunnel face based on the water volume change data, and determines the number of MBR sewage treatment equipment to be started based on the water inflow of the tunnel face.

[0034] Specifically, the calculation formula for water inflow Q is:

[0035]

[0036] Where Δt is the sampling interval, ΔV is the water level change in the water collection tank, ΔV=S×(H t -H t-1 ), S is the bottom area of ​​the water collection tank, H t is the current water level, H t-1 is the water level at the last sampling moment;

[0037] Obtain the preset rated sewage treatment capacity of a single MBR sewage treatment equipment, and determine the number of MBR sewage treatment equipment to be started based on the inflow and the sewage treatment capacity of the single MBR sewage treatment equipment. 额 80% of Q e As a safe operation threshold, one device is reserved for backup. Taking 5 devices as an example, the number of MBR sewage treatment equipment to be started is:

[0038] Q e , start 1,

[0039] Q e <Q<2Q e , start 2 units,

[0040] 2Q e <Q<3Q e , start 3 units,

[0041] 3Q e <Q<4Q e , 4 units were started, and there is currently 1 spare device left, which triggered the alarm to facilitate staff to deal with it in advance.

[0042] In this embodiment, a 15-minute hysteresis interval is also set to prevent frequent start and stop of the equipment. When Q is lower than the current treatment capacity for one hour continuously, the MBR sewage treatment equipment is shut down step by step.

[0043] When the inflow exceeds the sewage treatment capacity of all current MBR sewage treatment equipment, that is, Q>5Q e ​When the tunnel is in a state of emergency, workers control the valve installed on the first pipeline, stopping the direct injection of sewage from the tunnel into the MBR sewage treatment equipment. Instead, they inject it into the emergency regulating tank first. The pump inside the emergency regulating tank is then activated, pumping the sewage from the emergency regulating tank into the MBR sewage treatment equipment. By monitoring the water level changes in the first-stage water collection tank in real time, calculating the water inflow at the tunnel face, and controlling the start and stop of the MBR equipment based on the preset treatment capacity, a flexible match between sewage treatment capacity and sewage generation can be achieved. In the event of a sudden surge in water inflow, the emergency regulating tank acts as a buffer unit, temporarily storing excess sewage and preventing system overload.

[0044] S4. MBR sewage treatment equipment treats sewage and discharges the treated clean water into the clean water tank.

[0045] like Figure 2 As shown, specifically, the MBR sewage treatment equipment includes a regulating tank, an anaerobic tank, an MBR reaction tank, and a sludge tank; in this embodiment, before the sewage is injected, it is first filtered through a screen, then injected into the regulating tank, and then pumped to the anaerobic tank for treatment through a submersible sewage pump in the regulating tank. After treatment, it flows into the MBR reaction tank, and air is introduced into the MBR reaction tank through a blower; the water filtered by the MBR membrane is pumped out by a suction pump, and discharged into the clear water tank after adding chemicals; the chemicals include disinfectants, pH regulators, etc.

[0046] The residue in the MBR reaction tank is pumped into the sludge tank through the sludge pump installed at the bottom of the MBR reaction tank, so that the clean water in the sludge tank flows back to the regulating tank for circulation treatment.

[0047] S5. Test the water quality in the clear water tank and generate a water quality test report. The water quality test report includes pH value, ammonia nitrogen content, hexavalent chromium content, petroleum substance content, etc. In this embodiment, the treated water quality needs to meet agricultural and animal husbandry fish farming standards.

[0048] This solution utilizes pumping equipment to progressively transport face wastewater to the MBR sewage treatment facility outside the tunnel. Using modular MBR treatment units, water quality and quantity are balanced in a regulating tank before entering an anaerobic tank for organic matter degradation. Subsequently, aeration-enhanced biological treatment and membrane separation synergize in the MBR reactor to achieve deep removal of pollutants such as suspended solids and COD. The activated sludge generated during the treatment process is returned to the regulating tank through a dedicated channel, forming a biomass recycling mechanism. This effectively improves treatment efficiency, ensures water quality, and eliminates pollution risks to the surrounding ecological environment.

[0049] Example 2

[0050] The difference between this embodiment and the first embodiment is that this embodiment also includes e ​When the MBR system is in operation, the sewage is diverted according to its type, and discharged into different MBR sewage treatment equipment for treatment to reduce the load on the MBR system. The sewage types include blasting wastewater, mechanical flushing water, and face water.

[0051] Specifically, a water quality sensor array is installed in the water collection tank closest to the tunnel face to monitor nitrate and oil content. If the nitrate content exceeds the nitrate content threshold, it is considered blasting wastewater; if the oil content exceeds the oil content threshold, it is considered mechanical flushing water. Otherwise, it is considered tunnel face water inrush. The nitrate content threshold and oil content threshold can be set based on actual conditions.

[0052] Solenoid valves are also installed in each first pipeline to replace manual labor and automatically control the injection of sewage in the tunnel into each MBR sewage treatment equipment or into the emergency regulating tank.

[0053] A fixed MBR sewage treatment equipment is assigned to each type of sewage, and the current type of sewage is injected into the corresponding MBR sewage treatment equipment.

[0054] This embodiment can improve the pertinence of sewage treatment by identifying different types of sewage and guiding them to corresponding MBR sewage treatment equipment for treatment.

[0055] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field to which the invention belongs before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for ecological and environmentally friendly treatment of tunnel sewage, characterized in that: The steps include: S1. Set up several water collection tanks along the tunnel; install sewage pumping equipment at the tunnel face and in the water collection tanks; S2. Install several MBR sewage treatment equipment outside the tunnel and set up a clear water tank; S3. Start the pumping and drainage equipment in the tunnel face and each water collection tank, pump the sewage from the tunnel face upward to each water collection tank step by step, and finally inject it into the MBR sewage treatment equipment; S4. MBR sewage treatment equipment treats sewage and discharges the treated clean water into the clean water tank.

2. The method for ecological and environmentally friendly treatment of tunnel sewage according to claim 1, characterized in that: The MBR sewage treatment equipment includes a regulating tank, an anaerobic tank, an MBR reaction tank, and a sludge tank; The sewage is injected into the regulating tank, and then pumped to the anaerobic tank for treatment through the submersible sewage pump in the regulating tank. After treatment, it flows into the MBR reaction tank, and air is introduced into the MBR reaction tank through the blower; the water filtered by the MBR membrane is pumped out by the suction pump, and discharged into the clear water tank after adding chemicals; The residue in the MBR reaction tank is pumped into the sludge tank through the sludge pump installed at the bottom of the MBR reaction tank, so that the clean water in the sludge tank flows back to the regulating tank.

3. The method for ecological and environmentally friendly treatment of tunnel sewage according to claim 2, characterized in that: In step S3, water volume change data of the water collection tank closest to the tunnel face is also collected, the current water inflow of the tunnel face is analyzed based on the water volume change data, and the number of MBR sewage treatment equipment to be started is determined based on the water inflow of the tunnel face.

4. The method for ecological and environmentally friendly treatment of tunnel sewage according to claim 3, characterized in that: In step S3, the water inflow Q is calculated as: Among them, ΔV is the water level change in the water collection tank, and Δt is the sampling interval; Obtain the preset rated sewage treatment capacity of a single MBR sewage treatment equipment, and determine the number of MBR sewage treatment equipment to be started based on the inflow volume and the sewage treatment capacity of a single MBR sewage treatment equipment.

5. The method for ecological and environmentally friendly treatment of tunnel sewage according to claim 4, characterized in that: The step S2 further includes setting up an emergency regulating pool outside the tunnel; When the amount of water inflow exceeds the sewage treatment capacity of all current MBR sewage treatment equipment, the sewage in the tunnel will be first injected into the emergency regulating tank, and then injected into the MBR sewage treatment equipment from the emergency regulating tank.

6. The method for ecological and environmentally friendly treatment of tunnel sewage according to claim 5, characterized in that: The method further includes step S5 of testing the water quality in the clear water tank and generating a water quality test report.

7. The method for ecological and environmentally friendly treatment of tunnel sewage according to claim 6, characterized in that: In step S3, the type of sewage in the water collection tank closest to the tunnel face is also detected, and different types of sewage are discharged into different MBR sewage treatment equipment for treatment; the sewage types include blasting wastewater, mechanical flushing water, and tunnel face water.

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