Filter pressing treatment device for production wastewater in construction period of railway tunnel engineering

Abstract

The utility model discloses a railway tunnel engineering construction period production wastewater filter pressing treatment device which comprises a horizontal flow type adjusting oil separation precipitation drying water tank, the water inlet end of the horizontal flow type adjusting oil separation precipitation drying water tank is communicated with the water outlet end of a primary sedimentation tank, and the water outlet end of the horizontal flow type adjusting oil separation precipitation drying water tank is communicated with a filter pressing device. The filter pressing device is used for carrying out filter pressing filtration on wastewater in the filter chamber, a washing mechanism for carrying out back washing on filter cloth is further arranged in the filter pressing device, the filter pressing device comprises a main beam, the main beam serves as an assembly foundation of the filter pressing device, a thrust plate for providing filter pressing counter force is arranged at the position of the main beam, a feeding port is formed in the thrust plate, and a discharging port is formed in the feeding port. And the feeding hole is connected with each filter chamber in series. The filter pressing treatment device for the production wastewater in the railway tunnel engineering construction period is high in automation degree, low in investment and operation cost, simple to maintain and manage and capable of being repeatedly transferred to be installed and used, and wastewater reuse and sludge recovery are completed at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of production wastewater treatment equipment, and in particular relates to a filter pressure treatment device for production wastewater during the construction period of a railway tunnel project. Background Art

[0002] Tunnel construction currently relies primarily on drilling and blasting methods. Construction wastewater and tunnel seepage generated during tunnel construction operations primarily contain inorganic pollutants, high suspended solids (SS) content, a slightly alkaline nature, and certain amounts of ammonia nitrogen, petroleum, and other pollutants, with relatively poor biodegradability. Current tunnel construction wastewater treatment processes primarily include neutralization, coagulation, sedimentation, filtration, and flotation. These processes are complex, require numerous equipment and facilities, and result in unstable operation, making it difficult to achieve acceptable water quality. While some wastewater treatment facilities are relatively well-developed, they suffer from high investment and operating costs, difficulty in sludge treatment, and demanding maintenance requirements. On-site maintenance and management technicians lack operational management experience and professional guidance in wastewater treatment processes and water quality monitoring. This results in reduced wastewater treatment equipment capacity and an increased risk of water quality exceeding standards. Summary of the Invention

[0003] The utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide a filter pressure treatment device for production wastewater during the construction period of a railway tunnel project.

[0004] The technical solution of the utility model is: a filter pressure treatment device for production wastewater during the construction period of a railway tunnel project, comprising a horizontal flow regulating oil separation sedimentation and drying water tank, the water inlet end of the horizontal flow regulating oil separation sedimentation and drying water tank is connected to the water outlet end of the primary sedimentation tank, the water outlet end of the horizontal flow regulating oil separation sedimentation and drying water tank is connected to a filter press device, the filter press device performs filter pressure filtration on the wastewater in the filter chamber, and the filter press device is also provided with a flushing mechanism for backwashing the filter cloth.

[0005] Furthermore, the water outlet of the horizontal flow regulating oil separation sedimentation drying water tank is connected to the filter press device through a second pipe, and a high-pressure pump for guiding the flow rate and direction of the medium is provided in the second pipe.

[0006] Furthermore, a PAM dosing device is provided in the second pipeline, and a drug inlet valve is correspondingly provided in the second pipeline.

[0007] Furthermore, a return pipe is connected in parallel in the second pipe, and the return pipe is connected to the flushing mechanism. The waste water of the flushing mechanism flows into the horizontal flow regulating oil separation sedimentation drying water tank through the return pipe.

[0008] Furthermore, a reflux valve for controlling the opening and closing of reflux is provided in the reflux pipeline.

[0009] Furthermore, the filter press device includes a main beam, which serves as an assembly base for the filter press device. A thrust plate for providing filter press reaction force is provided on the main beam, and a feed port is provided in the thrust plate. The feed port is connected in series with each filter chamber.

[0010] Furthermore, a compression plate is provided at the main beam, and the compression plate moves toward the thrust plate under the drive of the driving structure to perform solid-liquid separation on the wastewater entering the filter chamber through the feed port.

[0011] Furthermore, the filter chambers are arranged in parallel and connected in series. The filter chambers include a diaphragm filter plate and a diaphragm matching plate. The upper ends of the diaphragm filter plate and the diaphragm matching plate are connected by a movable hinge so that they can be extended and retracted under the drive of the compression plate. A filter cloth for solid-liquid separation is sandwiched between the diaphragm filter plate and the diaphragm matching plate.

[0012] Furthermore, an air blowing pipe is connected to the side wall of the membrane filter plate, and the air blowing pipe blows air into the membrane filter plate, which can further reduce the moisture content of the filter cake.

[0013] Furthermore, the flushing mechanism includes a gantry that moves along the main beam, and a flushing structure is provided in the gantry.

[0014] The beneficial effects of the utility model are as follows:

[0015] During the construction period of this railway tunnel project, the wastewater filter pressure treatment device produced has a high degree of automation, low investment and operating costs, simple maintenance and management, can be repeatedly transferred and installed, and wastewater reuse and sludge recovery can be completed simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 This is a top view of the horizontal flow regulating oil separation sedimentation and drying water tank in the utility model;

[0018] Figure 3 yes Figure 2 Cross-section along the AA plane;

[0019] Figure 4 yes Figure 2 Cross-section along the BB plane;

[0020] Figure 5 It is a structural diagram of the foundation of the medium pressure filter of the utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the medium pressure filter device of the utility model Figure 1 ;

[0022] Figure 7This is a schematic diagram of the structure of the filter press device of the utility model Figure 2 ;

[0023] Figure 8 This is a structural diagram of the filter chamber of the utility model;

[0024] Figure 9 yes Figure 5 Left view of;

[0025] Figure 10 This is a left side view of the medium pressure filter device of the utility model;

[0026] Figure 11 This is a front view of the PAM dosing device in the utility model;

[0027] Figure 12 It is a top view of the filter press device and the filter press foundation of the utility model;

[0028] Figure 13 This is a pipe connection diagram of the medium pressure filter device and the horizontal flow regulating oil separation sedimentation drying water tank of the utility model;

[0029] in:

[0030] 1First pipeline 2Second pipeline

[0031] 3 Reflux pipe 4 PAM dosing device

[0032] 5 Sedimentation tank 6 Catchment area

[0033] 7 effluent area 8 sludge drying area

[0034] 9 middle partition 10 collecting mud bucket

[0035] 11 baffle 12 adjusts the oil separation and sedimentation area

[0036] 13 filter press foundation 14 main beam

[0037] 15 thrust plate 16 pressure plate

[0038] 17 feed port 18 filter chamber

[0039] 19 diaphragm filter plate 20 diaphragm matching plate

[0040] 21 filter cloth 22 air blowing pipe

[0041] 23 gantry 24 water distribution board

[0042] 25 up and down motion motor 26 water inlet pipe

[0043] 27 flush water tank 28 oil cylinder. DETAILED DESCRIPTION

[0044] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0045] like Figures 1 to 13 As shown, a filter pressure treatment device for wastewater produced during the construction period of a railway tunnel project includes a horizontal flow regulating oil separation sedimentation and drying water tank, the water inlet end of the horizontal flow regulating oil separation sedimentation and drying water tank is connected to the water outlet end of the primary sedimentation tank, and the water outlet end of the horizontal flow regulating oil separation sedimentation and drying water tank is connected to a filter press device, and the filter press device performs filter pressure filtration on the wastewater in the filter chamber 18. The filter press device is also provided with a flushing mechanism for backwashing the filter cloth 21.

[0046] The water outlet of the horizontal flow regulating oil separation sedimentation drying water tank is connected to the filter press device through the second pipe 2, and the second pipe 2 is provided with a high-pressure pump for guiding the flow rate and flow direction of the medium.

[0047] The second pipeline 2 is provided with a PAM dosing device 4 , and the second pipeline 2 is correspondingly provided with a drug inlet valve.

[0048] A return pipe 3 is also connected in parallel to the second pipe 2. The return pipe 3 is connected to the flushing mechanism, and the waste water of the flushing mechanism flows into the horizontal flow regulating oil separation sedimentation drying water tank through the return pipe 3.

[0049] The reflux pipe 3 is provided with a reflux valve for controlling the opening and closing of reflux.

[0050] The filter press device includes a main beam 14, which serves as an assembly base for the filter press device. A thrust plate 15 is provided on the main beam 14 to provide a filter press reaction force. A feed port 17 is provided in the thrust plate 15, and the feed port 17 is connected in series with each filter chamber 18.

[0051] A compression plate 15 is provided at the main beam 14 . The compression plate 15 moves toward the thrust plate 15 driven by the driving structure to perform solid-liquid separation on the wastewater entering the filter chamber 18 through the feed port 17 .

[0052] The filter chambers 18 are arranged in parallel and multiple are connected in series. The filter chambers 18 include a diaphragm filter plate 19 and a diaphragm matching plate 20. The upper ends of the diaphragm filter plate 19 and the diaphragm matching plate 20 are connected by a movable hinge so that they can be extended and retracted under the drive of the compression plate 15. A filter cloth 21 for solid-liquid separation is sandwiched between the diaphragm filter plate 19 and the diaphragm matching plate 20.

[0053] The side wall of the membrane filter plate 19 is connected to an air blowing pipe 22, and the air blowing pipe 22 blows air into the membrane filter plate 19 to further reduce the moisture content of the filter cake.

[0054] The flushing mechanism includes a gantry 23 that moves along the main beam 14 , and a flushing structure is provided in the gantry 23 .

[0055] Specifically, an oil cylinder 28 is provided at one end of the main beam 14 , and the pressing plate 15 is driven by the oil cylinder 28 and the hydraulic telescopic device.

[0056] Specifically, the air blowing pipe 22 is an air supply main pipe, and a plurality of flexible pipes are connected on the pipe wall of the air blowing pipe 22 , one end of the flexible pipe is connected to the air blowing pipe 22 , and the other end of the flexible pipe is connected to the diaphragm filter plate 19 .

[0057] Specifically, the gantry 23 in the flushing mechanism moves parallel to the main beam 14 , and a vertically movable water distribution plate 24 is provided in the gantry 23 , and water distribution holes are formed in the water distribution plate 24 so that flushing can be performed, and the water inlet end of the water distribution plate 24 is connected to the water inlet pipe 26 .

[0058] More specifically, the water inlet pipe 26 passes through the through hole on the top of the gantry 23 and is communicated with the water distribution plate 24 .

[0059] Specifically, the water distribution plate 24 is parallel to the upper end of the gantry 23 , and an up-and-down motion motor 25 is provided on the upper end of the gantry 23 . The execution end of the up-and-down motion motor 25 passes through the gantry 23 and is connected to the water distribution plate 24 .

[0060] More specifically, the actuator end of the up-and-down motion motor 25 is connected to the back center of the water distribution plate 24 .

[0061] Specifically, the water inlet end of the horizontal flow regulating oil separation sedimentation drying water tank is connected to the water outlet end of the primary sedimentation tank through the first pipe 1. The horizontal flow regulating oil separation sedimentation drying water tank is a double-layer double-format structure including a sludge drying area 8 located on the upper layer and a regulating oil separation sedimentation area 12 located on the lower layer.

[0062] Specifically, the filter press device includes a frame, a filtering mechanism, a hydraulic mechanism, a unloading mechanism and a control mechanism. The filter press device also includes a flushing mechanism for flushing the filter cloth 21 in the filtering mechanism. The sewage after flushing the filter cloth 21 flows back to the horizontal flow regulating oil separation sedimentation drying water tank through the return pipe 3.

[0063] The PAM dosing device includes a medicine dispensing barrel 401, a medicine storage barrel 402, and a mixer 403.

[0064] Specifically, the medicine storage barrel 402 stores the required medicines. When wastewater treatment is required, the required medicines are put into the medicine dispensing barrel 401 and stirred by the mixer 403. The stirred medicines are then put into the corresponding water pool through the piping and dosing device.

[0065] Example 1

[0066] In this embodiment, the wastewater generated during the construction of the railway tunnel enters the horizontal flow regulating oil separation sedimentation and drying water tank through the drainage system, and is added with drugs through the dosing device for flocculation reaction. The high-pressure pump sends the sewage after the addition of drugs to the filter press device for mud and water separation. The water treated by the filter press is directly discharged. After the filter press completes a working cycle, the filter plate and filter cloth are flushed by the flushing mechanism. The flushed sewage is returned to the horizontal flow regulating oil separation sedimentation and drying water tank, and the mud cake pressed by the filter press is regularly transported out.

[0067] Specifically, production wastewater enters the horizontal flow regulating oil separation, sedimentation, and drying water tank. Before entering the horizontal flow regulating oil separation, sedimentation, and drying water tank, it is dosed with chemicals via a PAC dosing device to achieve wastewater dosing and coagulation. The horizontal flow regulating oil separation, sedimentation, and drying water tank has a double-layer, double-compartment structure. The lower layer regulates water quantity and quality, performs coagulation and sedimentation, and separates oil and water; the upper layer performs sludge drying. After being conditioned in the horizontal flow regulating oil separation, sedimentation, and drying water tank, the wastewater is pumped into the filter press via a high-pressure pump. Upon entering the filter press, chemicals are added via a PAM dosing device 4 to achieve wastewater dosing and coagulation. Finally, the filter press separates mud and water. The filter cloth can be automatically cleaned via a flushing mechanism, and the wastewater, after flushing the filter plates and cloth, is returned to the horizontal flow regulating oil separation, sedimentation, and drying water tank via a return pipe.

[0068] During the construction period of this tunnel project, the wastewater treatment filter press device has a high degree of automation, low investment and operating costs, simple maintenance and management, can be repeatedly transferred and installed, and wastewater reuse and sludge recovery can be completed simultaneously.

[0069] The filter press device for treating wastewater during tunnel construction has good treatment effect, strong impact load resistance, short flocculation reaction process and small footprint. The process features are as follows:

[0070] Surface load: 15-20m 3 / m 2 *h

[0071] Excellent phosphorus removal effect: TP≤0.5mg / L

[0072] Outlet water quality advantages: COD, SS, TP (can reach Class A standard)

[0073] Saving of coagulant dosage: 20%-35%

[0074] High load impact resistance: 40m 3 / m 2 *h

[0075] Specifically, in this embodiment, the first pipeline 1 is connected to a PAC dosing device, and the second pipeline 2 is connected to a PAM dosing device 4 .

[0076] The dosing device includes: a drug storage device, a drug solution preparation device, and a metering device. The drug storage device is used to store the drug solution; the drug solution preparation device is located above the drug storage device and uses a stirring device to produce the drug solution, which is connected to the drug storage device through a pipeline. The metering device adds the drug solution in the drug storage device to the horizontal flow regulating oil separation sedimentation and drying water tank.

[0077] Specifically, in this embodiment, the second pipeline 2 is provided with a feed valve, the second pipeline 2 is connected to a reflux pipeline 3, and the reflux pipeline 3 is provided with a reflux valve.

[0078] Specifically, the horizontal flow regulating oil separation sedimentation and drying water tank includes a sedimentation tank 5, a water collection area 6 arranged on the water inlet side of the sedimentation tank 5, a water outlet area 7 arranged on the water outlet side of the sedimentation tank 5, and a sludge drying tank arranged above the sedimentation tank 5. The sludge drying tank serves as the sludge drying area 8 to achieve sludge drying. The sewage after drug addition enters the sedimentation tank 5 through the water collection area 6, so that the water after the flocculation reaction is evenly distributed to the regulating oil separation sedimentation area 12, achieving water quantity and water quality regulation, coagulation and sedimentation, and oil-water separation. The water collection area 6 is used to collect water, reduce turbulence, and enable the water in the regulating oil separation sedimentation area 12 to be collected more evenly. After collection, the water enters the water outlet area 7 for discharge.

[0079] Specifically, the water inlet and outlet method is top-in and top-out, and the bottom of the horizontal flow adjustment oil separation sedimentation drying water tank can be but not limited to electric sludge discharge or manual sludge discharge, and the discharge cycle is determined according to the sludge situation.

[0080] Specifically, the middle of the sedimentation tank 5 is provided with a middle partition 9 along its length direction to divide the sedimentation tank 5 into a double-format sedimentation tank. The lower part of the sedimentation tank 5 is recessed downward and provided with a mud collecting hopper 10. The mud hopper has a large angle to ensure smooth mud discharge. Figure 1-2 shown.

[0081] Specifically, a baffle 11 is provided on the outlet side of the sedimentation tank 5. The baffle 11 divides the sedimentation tank 5 into an oil separation and sedimentation area 12 and an outlet area 7. The upper end of the middle partition 9 is connected to the bottom wall of the sludge drying tank. The height of the baffle 11 is lower than that of the middle partition 9. Water overflowing from above the baffle 11 enters the outlet area 7. The baffle 11 is provided with a through hole.

[0082] Example 2

[0083] The second embodiment of the present invention is a further improvement on the basis of the first embodiment, so as to give full play to the technical advantages of the present invention, which will be described below by way of example.

[0084] The filter press device is installed on a filter press foundation 13, and the filter press foundation 13 includes a concrete foundation and a filter press platform arranged on the concrete foundation.

[0085] Specifically, the frame of the filter press device includes a main beam 14 for supporting the filter mechanism. A thrust plate 15 and a pressure plate 16 are positioned opposite each other on the main beam 14. The thrust plate 15 is fixedly connected to the main beam 14 and provided with a feed port 17. The pressure plate 16 is slidably connected to the main beam 14 and driven by a hydraulic mechanism. The frame is the foundation of the entire device, primarily supporting the filter mechanism and consisting of the thrust plate 15, pressure plate 16, and main beam 14.

[0086] The main beam 14 supporting the filter mechanism features strong lateral bending resistance, high tensile strength, and excellent mechanical properties. The thrust plate 15 and pressure plate 16 are welded from high-quality carbon steel. During operation, the piston rod on the oil cylinder pushes the pressure plate 16, compressing the membrane filter plate 19, membrane matching plate 20, and filter cloth 21 located between the pressure plate 16 and the thrust plate 15, ensuring pressurized filtration of pressurized materials within the filter chamber.

[0087] Specifically, the filtering mechanism is located between the thrust plate 15 and the pressure plate 16. The filtering mechanism includes several filter chambers 18 neatly arranged on the main beam. The filter chambers 18 include a diaphragm filter plate 19, a diaphragm matching plate 20 and a filter cloth 21 sandwiched therebetween. The tops of the diaphragm filter plate 19 and the diaphragm matching plate 20 are connected by a hinge structure.

[0088] More specifically, ear plates are provided on both sides of each plate frame in the filtering mechanism, namely the membrane filter plate 19 and the membrane matching plate 20, and filter cloths are arranged on the ear plates to achieve separation of mud and water.

[0089] The working process of the filtering mechanism is as follows:

[0090] At the beginning of filtration, the material enters each filter chamber 18 through the feed port 17 of the thrust plate 15 under the push of the feed pump. The filter slurry is separated into solid and liquid by the pressure generated by the feed pump. Due to the action of the filter cloth 21, the solid remains in the filter chamber to form a filter cake, and the filtrate is discharged from the drain valve.

[0091] If the filter cake needs to be washed, washing water can be introduced through the washing port on the thrust plate 15 to wash the filter cake; if a filter cake with a lower moisture content is required, since it is equipped with a diaphragm filter plate 19, compressed air can be introduced into the air inlet on the diaphragm liner 20 to squeeze the filter cake and further reduce the moisture content of the filter cake. High-pressure air can also be introduced from the feed port 17 at the thrust plate end to pass through the filter cake layer, allowing air to flow through the middle to squeeze out some of the moisture in the filter cake.

[0092] Specifically, the membrane filter plate 19 is a polypropylene membrane filter plate, and an air blowing pipe 22 is connected to the membrane filter plate 19. By blowing air into the membrane filter plate 19, the volume of the filter chamber thereof is changed, and the filter cake is squeezed to further reduce the moisture content of the filter cake.

[0093] Furthermore, in this embodiment, it can also be considered that the unloading mechanism includes a variable frequency reduction motor and a transmission shaft, a sprocket, and a chain. When the clamping plate is released, the variable frequency reduction motor is powered on and the filter chambers are opened in turn through the sprocket and chain to complete the unloading process.

[0094] Specifically, the hydraulic mechanism includes a hydraulic station and a cylinder 28, the piston rod of which is connected to the pressure plate 16. The hydraulic mechanism is the power unit that performs the clamping and loosening actions of the main machine. Under the action of the electrical control system, the hydraulic cylinder 28, oil pump, and hydraulic components complete part of the system's work. When the system is compressed by the hydraulic station and cylinder, it seals each filter chamber for filtration. Conversely, when it is loosened, it is used for unloading.

[0095] In this embodiment, the feeding method of the filter press device is intermediate feeding, that is, the feed port 17 is located in the middle of the thrust plate 15, with fast filtration speed, reasonable structure, simple operation, convenient maintenance, safety and reliability, and can realize automatic pressing, pressure maintenance, pressure replenishment, loosening, plate pulling and other processes.

[0096] Example 3

[0097] The third embodiment of the present invention is a further improvement on the basis of the first or second embodiment, so as to give full play to the technical advantages of the present invention, which will be described below by way of example.

[0098] The flushing mechanism includes slide rails arranged on both sides of the main beam 14, a gantry 23 slidably connected to the slide rails, a water distribution plate 24 located in the gantry 23, a horizontal action motor that drives the gantry to move on the slide, and an up and down action motor 25 that drives the water distribution plate to move up and down in the gantry. When the filter cloth shows signs of blockage, the flushing mechanism is used to automatically clean the filter cloth, thereby enhancing the filtration speed of the filter cloth and extending the service life of the filter cloth.

[0099] In this solution, the impurity particles in the tunnel construction wastewater are relatively small and sticky, and are difficult to clean after adhering to the filter cloth. A set of cleaning brush heads is added above the filter press cleaning nozzle. During the cleaning process, the cleaning brush heads move up and down with the nozzle, and water flushing and brushing are carried out simultaneously to achieve better cleaning effects, avoiding the need to disassemble the plate frame and replace the filter cloth multiple times before use, extending the single use cycle of the filter press, improving the working efficiency of the filter press, speeding up the project progress, and reducing the use cost.

[0100] Specifically, the water inlet joint on the water distribution plate 24 is connected to the flushing water pump in the flushing water tank 27 through the water inlet pipe 26. The water distribution plate 24 is provided with at least one row of high-pressure nozzle groups. The flushing structure is a high-pressure nozzle group. Each row of high-pressure nozzle groups includes a number of high-pressure nozzles arranged at intervals, and the high-pressure nozzles spray obliquely toward the outside of the water distribution plate.

[0101] More specifically, the gantry 23 can slide on the slide rail, the water distribution plate 24 is located inside the gantry 23, and a water inlet joint is provided on the water distribution plate 24. The water inlet joint is connected to the flushing water pump in the flushing water tank 27 through the water inlet pipe 26. The water distribution plate 24 can move above the filter press driven by the gantry 23. The width of the water distribution plate 24 is greater than or equal to the width of the plate frame. The water distribution plate 24 has two rows of high-pressure nozzle groups arranged in parallel, and each row of high-pressure nozzle groups includes a plurality of high-pressure nozzles arranged at intervals, and the high-pressure nozzles spray obliquely toward the outside of the water distribution plate 24.

[0102] Example 4

[0103] The fourth embodiment of the present invention is a further improvement on the basis of the above embodiments, so as to give full play to the technical advantages of the present invention, which will be described below by way of example.

[0104] The filter press's outlet is equipped with a water quality monitoring and control mechanism, which includes online COD, pH, and SS detection equipment, and a control system module. These devices perform online wastewater quality testing, and the control system module controls the water outlet based on the test results. When the water meets quality standards, it is discharged into a reuse water tank. If it falls short, it is automatically pumped back to the filter press for further treatment.

[0105] The utility model realizes the reuse of tunnel construction wastewater up to standard and the recycling of sludge. The horizontal flow regulating oil separation, sedimentation and drying water tank is a double-layer, double-compartment device. The lower layer regulates water volume and quality, performs coagulation and sedimentation, and separates oil and water, while the upper layer dries sludge. Filter cloths are installed on both sides of each plate frame in the filter press to separate mud and water. During the tunnel construction period, the impurity particles in the industrial wastewater are mostly fine suspended particles. The dosing device flocculates the fine suspended particles into large-size flocs, which are beneficial for the filter cloth to intercept. The water quality monitoring and control mechanism performs online detection of COD, pH, and SS, and monitors water quality based on the test results. When the water quality meets the standards, it is reused. If the water quality does not meet the standards, it is returned to the filter press for further treatment. The water quality test results are uploaded to the "Railway Construction Project Environmental and Water Conservation Information Management System" in real time. The filter cloth cleaning mechanism increases the frequency of filter cloth use, maintains the effective filtration area of the filter cloth for a longer period of time, improves filtration efficiency and effectiveness, reduces the time and frequency of manual disassembly of the plate frame to replace the filter cloth, and reduces the frequency of manual intervention. The high degree of automation and unmanned operation within a certain period of time ensure construction progress and reduce operating costs.

[0106] During the construction period of this tunnel project, the wastewater treatment filter press device has a high degree of automation, low investment and operating costs, simple maintenance and management, can be repeatedly transferred and installed, and wastewater reuse and sludge recovery can be completed simultaneously.

[0107] Preferred Embodiments

[0108] In order to improve the working efficiency of the filter press device and shorten the treatment cycle of sludge dewatering, this study studied the factors affecting the treatment capacity of the filter press device and analyzed the water output effect of the filter press device under different conditions.

[0109] 1. Study on the processing capacity of filter press under different conditions

[0110] Water inlet (20m 3 / h), selected 120 mesh, 160 mesh, and 200 mesh filter cloths as influencing factors, started the filter press, added polyferric chloride and polyacrylamide respectively, recorded the operating data of the entire equipment, and took the average value. The data are shown in the table.

[0111] Table 1 Treatment effects under different conditions

[0112]

[0113]

[0114]

[0115] The above research data were summarized and three filter cloths with different mesh sizes of 120 mesh, 160 mesh and 200 mesh were used to conduct a horizontal comparison of the effluent water quality (COD, SS).

[0116] This application makes an optimal definition of the filter press treatment parameters, which are as follows:

[0117] First, when other conditions are the same, it is preferred to use a 200-mesh filter cloth 21 in actual use. When a 200-mesh filter cloth is used, the treatment effect on tunnel wastewater is the best. That is, the higher the mesh number of the filter cloth 21, the better the removal effect of COD and SS in the wastewater.

[0118] Then, when other conditions are the same, in actual use, it needs to be used with flocculants, namely polyaluminum chloride PAC or polyferric sulfate PFS. Without adding any agents, the removal rate of COD and SS is about 10-20%.

[0119] Then, when other conditions are the same, it needs to be used with the coagulant aid PAM in actual use. The COD removal rate and SS removal rate of the coagulant aid PAM are higher than those without the coagulant aid PAM.

[0120] Later, polyferric sulfate (PFS) + polyacrylamide (PAM) was used in actual use.

[0121] Since the wastewater produced during the construction period of railway tunnel projects is alkaline wastewater (pH value is about 8 to 10), when other conditions are the same, the use of polyferric sulfate (PFS) + polyacrylamide (PAM) has higher COD removal rate and SS removal rate than polyaluminium chloride (PAC) PAC + polyacrylamide (PAM). Therefore, it is recommended to use polyferric sulfate (PFS) + polyacrylamide (PAM) in actual use.

[0122] Then, when other conditions remain the same, increasing the PFS dosage in actual use significantly improves the removal rates of effluent COD and SS. This indicates that a larger dosage improves the treatment effect, but also increases the cost. A reasonable dosage should be used based on the actual site conditions.

[0123] Finally, when all other conditions remain the same, in actual use, the COD and SS removal rates at 5-15°C effluent temperatures are lower than those at 20-35°C. This indicates that, given the same filter cloth mesh size and other external conditions, higher temperatures produce the best tunnel wastewater treatment results. Under the same influent and filter cloth mesh size conditions, higher temperatures result in better tunnel wastewater treatment, requiring less dosage of various chemicals and lowering investment costs. Lower temperatures require increased chemical dosage to ensure effluent quality, resulting in higher investment costs.

[0124] In summary, when selecting a filter press, factors such as the mesh size of the filter cloth, the dosage of the reagent, the water quality, and the temperature should be comprehensively considered based on actual needs to achieve the best treatment effect and economic benefits. At the same time, it is also important to maintain a suitable operating temperature to improve the stability and service life of the equipment.

[0125] During the construction period of this railway tunnel project, the wastewater filter pressure treatment device produced has a high degree of automation, low investment and operating costs, simple maintenance and management, can be repeatedly transferred and installed, and wastewater reuse and sludge recovery can be completed simultaneously.

Claims

1. A filter press treatment device for wastewater produced during the construction period of a railway tunnel project, comprising a horizontal flow regulating oil separation, sedimentation and drying water tank, characterized by: The water inlet of the horizontal flow regulating oil separation sedimentation drying water tank is connected to the water outlet of the primary sedimentation tank, and the water outlet of the horizontal flow regulating oil separation sedimentation drying water tank is connected to the filter press device, and the filter press device performs filter pressure filtration on the wastewater in the filter chamber (18). The filter press device is also provided with a flushing mechanism for backwashing the filter cloth (21).

2. The device for filter press treatment of production wastewater during railway tunnel construction according to claim 1, characterized in that: The water outlet of the horizontal flow regulating oil separation sedimentation drying water tank is connected to the filter press device through a second pipe (2), and a high-pressure pump for guiding the flow rate and flow direction of the medium is provided in the second pipe (2).

3. The device for filter press treatment of production wastewater during railway tunnel construction according to claim 2, characterized in that: A PAM dosing device (4) is provided in the second pipeline (2), and a drug inlet valve is correspondingly provided in the second pipeline (2).

4. The device for treating wastewater produced during the construction period of a railway tunnel project according to claim 3, characterized in that: A return pipe (3) is also connected in parallel to the second pipe (2), and the return pipe (3) is connected to the flushing mechanism, and waste water from the flushing mechanism flows into the horizontal flow regulating oil separation sedimentation drying water tank through the return pipe (3).

5. The device for filter press treatment of production wastewater during railway tunnel construction according to claim 4, characterized in that: A reflux valve for controlling the opening and closing of reflux is provided in the reflux pipe (3).

6. The device for filter press treatment of production wastewater during railway tunnel construction according to claim 1, characterized in that: The filter press device comprises a main beam (14), the main beam (14) serving as an assembly base for the filter press device, a thrust plate (15) for providing filter press reaction force being provided on the main beam (14), a feed port (17) being provided in the thrust plate (15), and the feed port (17) being connected in series with each filter chamber (18).

7. The device for treating wastewater produced during the construction period of a railway tunnel project according to claim 6, characterized by: A compression plate (16) is provided at the main beam (14), and the compression plate (16) moves toward the thrust plate (15) under the drive of the driving structure to perform solid-liquid separation on the wastewater entering the filter chamber (18) through the feed port (17).

8. The device for treating wastewater produced during the construction period of a railway tunnel project according to claim 7, characterized by: The filter chambers (18) are arranged in parallel and multiple are connected in series. The filter chambers (18) include a diaphragm filter plate (19) and a diaphragm matching plate (20). The upper ends of the diaphragm filter plate (19) and the diaphragm matching plate (20) are connected by a movable hinge so that they can be extended and retracted under the drive of the pressing plate (16). A filter cloth (21) for solid-liquid separation is sandwiched between the diaphragm filter plate (19) and the diaphragm matching plate (20).

9. The device for treating wastewater produced during the construction period of a railway tunnel project according to claim 8, characterized by: The side wall of the membrane filter plate (19) is connected to an air blowing pipe (22), and the air blowing pipe (22) blows air into the membrane filter plate (19), thereby further reducing the moisture content of the filter cake.

10. The device for filter press treatment of industrial wastewater during the construction period of a railway tunnel project according to claim 6, characterized in that: The flushing mechanism comprises a gantry (23) that moves along the main beam (14), and a flushing structure is provided in the gantry (23).

Images