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

Abstract

The invention 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 invention 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 is currently mainly based on the drilling and blasting method. The construction wastewater and tunnel seepage generated during tunnel construction are mainly inorganic pollutants, with high suspended solids (SS) content, alkalinity and a certain amount of ammonia nitrogen, petroleum and other pollutants, and relatively poor biodegradability. At present, the tunnel construction wastewater treatment processes mainly include neutralization, coagulation, sedimentation, filtration, flotation, etc. The process is complex, the equipment and facilities are numerous, the operation is unstable, and it is difficult to meet the treated water quality standards. Although some wastewater treatment facilities are relatively complete, there are problems such as high investment and operating costs, inability to treat sludge, and high maintenance requirements. On-site maintenance and management technicians lack operation and management experience, and lack professional guidance in wastewater treatment processes and water quality monitoring, resulting in a decrease in the treatment capacity of wastewater treatment equipment and an increase in the risk of water quality exceeding standards. Summary of the invention

[0003] The present invention 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 present invention is: a filter pressure treatment device for wastewater produced during the construction period of a railway tunnel project, comprising a horizontal flow regulating oil separation sedimentation drying water tank, the water inlet end of the horizontal flow regulating oil separation sedimentation drying water tank is connected to the water outlet end of a primary sedimentation tank, the water outlet end of the horizontal flow regulating oil separation sedimentation drying water tank is connected to a filter pressure device, the filter pressure device performs filter pressure filtration on the wastewater in the filter chamber, and the filter pressure 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 pipeline, and a high-pressure pump for guiding the flow rate and direction of the medium is arranged in the second pipeline.

[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 arranged on the main beam, and a feed port is arranged in the thrust plate. The feed port is connected in series with each filter chamber.

[0010] Furthermore, a clamping plate is provided at the main beam, and the clamping 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 inlet.

[0011] Furthermore, the filter chambers are arranged in parallel and multiple are connected in series, and 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 clamping plate. A filter cloth for solid-liquid separation is sandwiched between the diaphragm filter plate and the diaphragm matching plate.

[0012] Furthermore, a blowing pipe is connected to the side wall of the membrane filter plate, and the 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 arranged in the gantry.

[0014] The beneficial effects of the present invention are as follows:

[0015] During the construction period of this railway tunnel project, the wastewater filter pressure treatment 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a top view of the advection-type regulating oil separation sedimentation and drying water tank in the present invention;

[0018] Figure 3 yes Figure 2 Sectional view along the AA plane;

[0019] Figure 4 yes Figure 2 Sectional view along the BB plane;

[0020] Figure 5 It is a structural schematic diagram of the filter press foundation of the present invention;

[0021] Figure 6 The structure of the filter press device in the present invention is shown in FIG. Figure 1 ;

[0022] Figure 7 The structure of the filter press device of the present invention is shown in FIG. Figure 2;

[0023] Figure 8 It is a schematic diagram of the structure of the filter chamber in the present invention;

[0024] Fig. 9 yes Figure 5 Left view of

[0025] Fig.10 It is a left side view of the filter press device of the present invention;

[0026] Fig.11 This is a front view of the PAM dosing device of the present invention;

[0027] Fig.12 It is a top view of the filter press device and the filter press foundation of the present invention;

[0028] Fig.13 It is a pipeline connection diagram of the filter press device and the horizontal flow regulating oil separation sedimentation drying water tank in the present invention;

[0029] in:

[0030] 1First pipeline 2Second pipeline

[0031] 3 Reflux pipeline 4 PAM dosing device

[0032] 5 Sedimentation tank 6 Catchment area

[0033] 7Effluent area 8Sludge drying area

[0034] 9 Middle partition 10 Mud collecting 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 clamping plate

[0038] 17 Feed inlet 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 action 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 drying water tank, 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, and the water outlet end of the horizontal flow regulating oil separation sedimentation drying water tank is connected to a filter pressure device, and the filter pressure device performs filter pressure filtration on the wastewater in the filter chamber 18, and the filter pressure 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 pipeline 2, and the second pipeline 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 in the second pipe 2 , and the return pipe 3 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 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 providing a filter press reaction force is disposed on the main beam 14 , and a feed port 17 is disposed in the thrust plate 15 , which is connected in series with each filter chamber 18 .

[0051] A pressing plate 15 is provided at the main beam 14 . The pressing 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 clamping 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 with an air blowing pipe 22, and the air blowing pipe 22 blows air into the membrane filter plate 19, which can 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 disposed in the gantry 23 .

[0055] Specifically, an oil cylinder 28 is disposed 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 connected to 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 disposed 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 action 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 drug dispensing barrel 401, a drug 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 the dosing device.

[0065] Embodiment 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 the dosing device adds drugs 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 one working cycle of the filter press is completed, the filter plate and filter cloth are flushed by the flushing mechanism, and the sewage after flushing 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, the production wastewater enters the horizontal flow regulating oil separation sedimentation drying water tank, and before entering the horizontal flow regulating oil separation sedimentation drying water tank, the wastewater is doped with drugs through the PAC dosing device to achieve wastewater dosing and coagulation. The horizontal flow regulating oil separation sedimentation drying water tank is a double-layer double-grid structure, and its lower layer realizes water quantity and water quality regulation, coagulation and sedimentation, and oil-water separation; its upper layer realizes sludge drying. The sewage regulated by the horizontal flow regulating oil separation sedimentation drying water tank is pumped into the filter press device through a high-pressure pump. When entering the filter press device, the sewage is doped with drugs through the PAM dosing device 4 to achieve wastewater dosing and coagulation. Finally, the mud and water are separated by the filter press device. The filter cloth can be automatically cleaned by the flushing mechanism, and the sewage after flushing the filter plate and filter cloth is returned to the horizontal flow regulating oil separation sedimentation drying water tank through the reflux 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 super high: 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 acceptable 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: drug storage equipment, liquid medicine preparation equipment, and metering equipment. The drug storage equipment is used to store liquid medicine; the liquid medicine preparation equipment is arranged at the upper end of the drug storage equipment, and the liquid medicine is made by the stirring equipment, and the liquid medicine is connected to the drug storage equipment through a pipeline; the metering equipment adds the liquid medicine in the drug storage equipment to the horizontal flow regulating oil separation sedimentation 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, and the sludge drying tank serves as a sludge drying area 8 to achieve sludge drying. The sewage after the addition of drugs 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, so as to achieve water quantity and water quality regulation, coagulation 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, and then enter the water outlet area 7 for discharge after collection.

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

[0080] Specifically, a middle partition 9 is provided in the middle of the sedimentation tank 5 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 bucket 10. The mud bucket 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, and the baffle 11 divides the sedimentation tank 5 into an oil separation 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, and the height of the baffle 11 is lower than that of the middle partition 9. Water overflowing from the baffle 11 enters the outlet area 7, and a through hole is opened on the baffle 11.

[0082] Embodiment 2

[0083] The second embodiment of the present invention is further improved on the basis of the first embodiment so as to give full play to the technical advantages of the present invention, which is 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 in the filter press device includes a main beam 14 for supporting the filter mechanism, a thrust plate 15 and a clamping plate 16 are arranged on the main beam 14, the thrust plate 15 is fixedly connected to the main beam 14, a feed port 17 is arranged on the thrust plate 15, and the clamping plate 16 is slidably connected to the main beam 14 and driven by a hydraulic mechanism. The frame is the foundation of the whole set of equipment, which is mainly used to support the filter mechanism and is composed of the thrust plate 15, the clamping plate 16 and the main beam 14.

[0086] The main beam 14 supporting the filter mechanism has strong lateral bending resistance, high tensile strength and good mechanical properties. The thrust plate 15 and the clamping plate 16 are welded with high-quality carbon steel. When the equipment is running, the piston rod on the oil cylinder pushes the clamping plate 16 to compress the diaphragm filter plate 19, diaphragm matching plate 20 and filter cloth 21 between the clamping plate 16 and the thrust plate 15 to ensure that the pressurized material is filtered under pressure in the filter chamber.

[0087] Specifically, the filtering mechanism is located between the thrust plate 15 and the pressure plate 16, and the filtering mechanism includes a plurality of filter chambers 18 neatly arranged on the main beam, and the filter chamber 18 includes a diaphragm filter plate 19, a diaphragm matching plate 20 and a filter cloth 21 sandwiched therebetween, and 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 effect 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 the diaphragm filter plate 19 is provided, 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 intermediate air to flow through and squeeze out part 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 to change the volume of its filter chamber, 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 loosened, the variable frequency reduction motor is powered on to open each filter chamber in turn through the sprocket and the chain to complete the unloading process.

[0094] Specifically, the hydraulic mechanism includes a hydraulic station and an oil cylinder 28, and the piston rod of the oil cylinder 28 is connected to the clamping plate 16. The hydraulic mechanism is a power device for the main machine to complete the clamping and loosening actions. Under the action of the electrical control system, the oil cylinder 28, the oil pump and the hydraulic components complete part of the system's work; when the system is clamped by the hydraulic station and the oil cylinder, each filter chamber is sealed for filtering, and 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 maintaining, pressure replenishing, loosening, pulling and other processes.

[0096] Embodiment 3

[0097] Embodiment 3 of the present invention is further improved on the basis of Embodiment 1 or 2 so as to give full play to the technical advantages of the present invention, which is 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 symptoms of clogging, 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 scheme, 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 multiple times to replace the filter cloth 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. 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, a water inlet joint is arranged 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, 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] Embodiment 4

[0103] Embodiment 4 of the present invention is further improved on the basis of the above embodiments so as to give full play to the technical advantages of the present invention, which is described below by way of example.

[0104] The outlet of the filter press is provided with a water quality monitoring and control mechanism, which includes a COD online detection device, a PH value online detection device, an SS online detection device, and a control system module. The COD online detection device, the PH value online detection device, and the SS online detection device realize online detection of wastewater quality, and the control system module realizes water outlet control according to the detection results. When the water quality meets the standard, it is discharged into the reuse water tank. When the water quality does not meet the standard, it is automatically pumped back to the filter press for further treatment.

[0105] The invention 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-grid device, the lower layer realizes water quantity and water quality regulation, coagulation sedimentation, oil-water separation, and the upper layer realizes sludge drying; filter cloths are arranged on both sides of each plate frame in the filter press to realize mud and water separation; the production wastewater during the construction period of the tunnel project has mostly fine suspended particles, and the fine suspended particles are flocculated into large-size floccules through the dosing device, which is conducive to the interception of the filter cloth; the water quality monitoring and control mechanism realizes online detection of COD, pH value, and SS, and realizes water quality monitoring according to the detection results. When the water quality meets the standard, it is reused, and when the water quality does not meet the standard, it is returned to the filter press for re-treatment, and the water quality detection results are uploaded to the "Railway Construction Project Environmental and Water Protection Information Management System" in real time; the filter cloth cleaning mechanism increases the frequency of use of the filter cloth, can maintain the effective filtering area of ​​the filter cloth for a long time, through the filtering efficiency and effect, reduces the time and frequency of manual disassembly of the plate frame to replace the filter cloth, reduces the frequency of manual intervention, has a high degree of automation and realizes unmanned management within a certain period of time, ensures the progress of the project construction, and reduces the operating cost.

[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 processing cycle of sludge dewatering, this study studied the influencing factors of the processing capacity of the filter press device and analyzed the water effluent 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 cloth as influencing factors, started the filter press, added polyferric chloride and polyacrylamide respectively, recorded the operating data of the whole 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 (120 mesh, 160 mesh, and 200 mesh) were used to make a horizontal comparison in terms of 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, because the 200-mesh filter cloth has the best treatment effect on tunnel wastewater. 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 a flocculant, namely polyaluminium chloride PAC or polyferric sulfate PFS. Without adding any agents, the removal rates of COD and SS are about 10-20%.

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

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

[0121] Since the wastewater produced during the construction period of the railway tunnel project is alkaline wastewater (pH value is about 8-10), 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 are the same, the PFS dosage is increased in actual use, and the removal rate of effluent COD and SS is significantly improved. This shows that the larger the dosage, the better the treatment effect, but the higher the cost. It is necessary to use a reasonable dosage according to the actual situation on site.

[0123] Finally, when other conditions are the same, in actual use, when the temperature is 5-15℃, the removal rates of effluent COD and SS are lower than those at 20-35℃, indicating that when the mesh number of the filter cloth and other external conditions are the same, the higher the temperature, the better the treatment effect of tunnel wastewater. Under the same influent and mesh number of the filter cloth, the higher the temperature, the better the treatment effect of tunnel wastewater, the less the dosage of various reagents, and the lower the investment cost. The lower the temperature, the more reagents need to be added to ensure the effluent quality, and the higher the investment cost.

[0124] In summary, when selecting a filter press, the influence of factors such as the mesh size of the filter cloth, the dosage of the reagent, the water output effect, and the temperature on the wastewater treatment effect should be considered comprehensively according to actual needs to achieve the best treatment effect and economic benefits. At the same time, attention should also be paid to maintaining a suitable working environment 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 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 in that: 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 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).

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

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

4. The device for filter press treatment of production wastewater during the construction period of a railway tunnel project according to claim 3 is characterized by: 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 the construction period of a railway tunnel project according to claim 4 is characterized by: The reflux pipeline (3) is provided with a reflux valve for controlling the opening and closing of reflux.

6. The device for filter press treatment of production wastewater during the construction period of a railway tunnel project 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 arranged on the main beam (14), a feed port (17) being arranged in the thrust plate (15), and the feed port (17) being connected in series with each filter chamber (18).

7. The device for filter press treatment of production wastewater during the construction period of a railway tunnel project according to claim 6, characterized in that: A clamping plate (15) is provided at the main beam (14), and the clamping plate (15) moves towards 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 inlet (17).

8. The device for filter press treatment of production wastewater during the construction period of a railway tunnel project according to claim 7, characterized in that: The filter chambers (18) are arranged in parallel and multiple are connected in series. The filter chambers (18) include a membrane filter plate (19) and a membrane matching plate (20). The upper ends of the membrane filter plate (19) and the membrane matching plate (20) are connected by a movable hinge so that they can be extended and retracted under the drive of the clamping plate (15). A filter cloth (21) for solid-liquid separation is sandwiched between the membrane filter plate (19) and the membrane matching plate (20).

9. The device for filter press treatment of production wastewater during the construction period of a railway tunnel project according to claim 8, characterized in that: 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 production 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 arranged in the gantry (23).

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