Sewage filtering device and method for building construction site

Abstract

The invention relates to the field of sewage filtering equipment, and discloses a sewage filtering device and method for a building construction site, the sewage filtering device comprises a first underframe, a second underframe on the right side of the first underframe, and a third underframe on the left side of the first underframe, the upper end of the first underframe is fixedly connected with a sedimentation tank, and the upper end of the sedimentation tank is fixedly connected with a coarse filtering tank. According to the sewage filtering device and method for the building construction site, by arranging multi-stage treatment structures such as the coarse filter tank, the sedimentation tank, the oil-water separation tank, the fine filter and the disinfection tank, pollutants of different types and particle sizes in sewage of the building construction site can be gradually removed; a filter grating, a first filter screen and a second filter screen in the coarse filter tank can effectively intercept impurity particles from large to small, a shell bottom and a spoiler of the sedimentation tank can efficiently settle heavy particles such as silt, and a plurality of filter layers with different particle sizes and materials in the fine filter can further remove residual fine particles and soluble pollutants. The overall filtering quality of the sewage is obviously improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage filtering equipment, and in particular to a sewage filtering device and method at a construction site. Background Art

[0002] With the booming development of the construction industry, the amount of sewage generated at construction sites is increasing. Construction sewage mainly comes from concrete maintenance wastewater, vehicle washing wastewater, construction dust reduction wastewater and construction workers' domestic sewage. These sewage contains a large number of pollutants, including but not limited to mud, gravel, cement residue, oil, heavy metal ions and various organic pollutants.

[0003] In the prior art, there are many problems in the treatment of sewage at construction sites. Some traditional sewage treatment methods and devices are often designed for general industrial sewage or domestic sewage, and do not fully consider the special properties of construction sewage. For example, the high sediment content and different particle sizes in construction sewage can easily cause rapid blockage of ordinary filtering equipment, reduce filtering efficiency, and increase equipment maintenance costs. The oil produced by mechanical equipment used during the construction process will form an oil film in the sewage. If it is not effectively removed, it will affect the effect of subsequent treatment processes and may cause sewage discharge to exceed the standard.

[0004] Some existing sewage treatment devices lack systematic design and are unable to grade and treat various pollutants in sewage in steps, resulting in the treated sewage being difficult to meet increasingly stringent environmental emission standards. At the construction site, if sewage is directly discharged without proper treatment, it will cause serious pollution to the surrounding soil and water environment. Therefore, a sewage filtration device and method for construction sites are proposed.

[0005] The Chinese invention patent announcement number: CN114534330A discloses a construction site sewage filtering and treatment device. The construction site sewage filtering and treatment device can open the cylinder, and after the second wedge rod contacts the first wedge rod, the cleaning frame can move downward, so that the cleaning frame can scrape down the mud and sand remaining on the filter plate, thereby preventing the mud and sand from clogging the filter plate. After the sewage is filtered, the protective plate can be pulled outward to open, so that the protective plate will not block the top of the shell, thereby facilitating the cleaning of the mud and sand remaining at the bottom of the shell, and the operation is convenient. However, the construction site sewage filtering and treatment device mainly focuses on the treatment of mud and sand, and has no targeted treatment measures for the common oil pollution in construction sewage, and the filtering effect is poor. The cleaning process involves multiple steps such as operating the cylinder, pulling the protective plate, rotating the limit rod, and lifting the filter plate, and the operation process is relatively complicated. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a sewage filtering device and method for a construction site, which can effectively solve the problems in the prior art.

[0007] The technical solution adopted by the present invention is: a sewage filtering device at a construction site, comprising a first base frame, a second base frame on the right side of the first base frame, and a third base frame on the left side of the first base frame, the upper end of the first base frame is fixedly connected to a sedimentation tank, the upper end of the sedimentation tank is fixedly connected to a coarse filter tank, the interior of the coarse filter tank is fixedly connected to a cleaning component, the front end of the sedimentation tank is fixedly connected to the input end of a first delivery pump through a pipeline, the output end of the first delivery pump is fixedly connected to a first connecting pipe, the output end of the first connecting pipe is fixedly connected to an oil-water separation tank, and the lower end of the oil-water separation tank is fixedly connected to A second connecting pipe is connected, one end of the second connecting pipe away from the oil-water separation tank is fixedly connected to the input end of the second delivery pump, the output end of the second delivery pump is fixedly connected to the lifting pipe, one end of the lifting pipe away from the second delivery pump is fixedly connected to a fine filter, one end of the fine filter close to the third base frame is fixedly connected to a disinfection tank, ultraviolet lamps are arranged on both sides of the inner wall of the disinfection tank, the upper end of the disinfection tank is fixedly connected to the input end of the third delivery pump through a pipeline, the upper end of the disinfection tank is fixedly connected to the input end of the fourth delivery pump through a pipeline, and the output end of the fourth delivery pump is fixedly connected to an output pipe;

[0008] The sedimentation tank comprises an outer shell, a shell bottom, a baffle and a sand discharge valve, the lower end of the outer shell is provided with a shell bottom, the upper end of the shell bottom is provided with a baffle, and the lower end of the shell bottom is provided with a sand discharge valve; the coarse filter tank comprises a filter shell, a debris discharge groove, a filter grid, a first filter screen, a second filter screen, a support frame, a filter box and a through groove, the front end of the filter shell is provided with a debris discharge groove, the filter grid is fixedly connected inside the filter shell, a first filter screen is provided below the filter grid, a second filter screen is provided below the first filter screen, the front end of the filter shell is fixedly connected with a support frame, the upper end of the support frame is plugged with a filter box, and a through groove is provided on a side of the filter box close to the filter shell;

[0009] The cleaning assembly includes a slide rail, a screw, a motor, a moving rod and a steel brush. The center of the slide rail is rotatably connected to a screw, and one end of the screw away from the impurity discharge groove is fixedly connected to the output end of the motor. The slide rail, screw and motor are provided in two symmetrical and identical groups. The centers of the two groups of slide rails are provided with moving rods, and the lower ends of the moving rods are fixedly connected to a steel brush.

[0010] The oil-water separation tank comprises a shell, a separation plate and an oil outlet pipe, the inner wall of the shell is fixedly connected to the separation plate, and the upper rear end of the shell is fixedly connected to the oil outlet pipe;

[0011] The fine filter includes a filter cartridge, a first filter layer, a second filter layer, a third filter layer, a fourth filter layer, a spray pipe, a recoil pipe, a reflux branch pipe, a reflux main pipe and a solenoid valve. The first filter layer, the second filter layer, the third filter layer and the fourth filter layer are fixedly connected inside the filter cartridge. A spray pipe is arranged inside the filter cartridge. The end of the spray pipe away from the filter cartridge is fixedly connected to the recoil pipe. The side of the filter cartridge close to the sedimentation tank is fixedly connected to the reflux branch pipe. The end of the reflux branch pipe close to the sedimentation tank is fixedly connected to the reflux main pipe. The outer side of the reflux main pipe is fixedly connected to the solenoid valve.

[0012] Preferably, the shell bottom is in an inverted cone structure, the baffles are arranged in an inclined and staggered manner at the upper end of the shell bottom, and the outer shell and the filter shell are connected to each other.

[0013] Through the above technical solution, the inverted cone-shaped shell bottom is conducive to the gathering of sediments such as mud and sand to the bottom under the action of gravity, and the inclined and staggered baffles can effectively slow down the flow rate of sewage and make the mud and sand settle more fully.

[0014] Preferably, three impurity removal grooves of the same size are provided, and the three impurity removal grooves respectively correspond to the filter grille, the first filter screen and the second filter screen, and three identical through grooves are provided. When the filter box is plugged and connected to the supporting frame, the through grooves correspond to the impurity removal grooves, and a lifting ear is provided on the upper end of the filter box.

[0015] Through the above technical solution, the plug-in connection between the filter box and the carrier frame is convenient for installation and disassembly, and easy to clean up debris, and the lifting ear design on the upper end of the filter box further facilitates the staff to lift it for cleaning operations, thereby improving the convenience of maintenance.

[0016] Preferably, the first filter screen adopts a 316 stainless steel mesh with a pore size of 5 mm to 10 mm, and the second filter screen adopts a 316 stainless steel mesh with a pore size of 2 mm to 3 mm.

[0017] Through the above technical solution, the first filter and the second filter use 316 stainless steel mesh with a specific aperture, which has good corrosion resistance and can adapt to the complex chemical environment of sewage at the construction site.

[0018] Preferably, three identical cleaning assemblies are provided, and the three cleaning assemblies correspond to the filter grille, the first filter screen and the second filter screen respectively, the screw rod is threadedly connected to the moving rod, and the moving rod is slidably connected to the slide rail.

[0019] Through the above technical solution, the cleaning component can fully cover the filtering area of ​​the coarse filter tank, prevent impurities from accumulating and clogging on the filter grid, the first filter screen and the second filter screen, reduce the frequency of manual cleaning, and improve the automation level and work efficiency of the entire coarse filter tank.

[0020] Preferably, the inclination angle of the separation plate is 45° to 60°, and the separation plate is made of polytetrafluoroethylene material.

[0021] Through the above technical scheme, an inclined separation plate is set. When the sewage flows in the oil-water separation tank, the oil can float upward along the separation plate. The separation plate made of polytetrafluoroethylene material has good oleophilic and hydrophobic properties, can efficiently adsorb oil, and achieve better oil-water separation effect, which greatly improves the ability to remove oil in sewage at construction sites, reduces the impact of oil on subsequent filtration links, and ensures the treatment quality of the sewage filtration device.

[0022] Preferably, the first filter layer is made of a granite stone layer with a particle size of 5mm to 10mm, the second filter layer is made of a quartz sand layer with a particle size of 2mm to 5mm, the third filter layer is made of a quartz sand layer with a particle size of 0.5mm to 2mm, and the fourth filter layer is made of an activated carbon layer.

[0023] Through the above technical solution, the granite stone layer of the first filter layer can first intercept relatively large residual particles in the sewage and perform preliminary fine filtration of the sewage. As the sewage passes through the second filter layer and the third filter layer with gradually decreasing particle sizes, the filtration accuracy is gradually improved, and finer impurities can be removed. Finally, the fourth filter layer using an activated carbon layer can adsorb some soluble pollutants in the sewage. Through the combination of multiple filter layers, deep removal of various types of pollutants in the sewage can be achieved, so that the sewage can be purified more thoroughly.

[0024] Preferably, four identical spray pipes and reflux branch pipes are provided, and the four spray pipes and reflux branch pipes are respectively arranged above the first filter layer, the second filter layer, the third filter layer and the fourth filter layer. The output end of the reflux main pipe corresponds to the upper opening of the coarse filter tank, and the end of the backwash pipe away from the spray pipe is fixedly connected to the output end of the third delivery pump.

[0025] Through the above technical scheme, the four spray pipes correspond to different filter layers respectively, and each filter layer can be backwashed comprehensively and evenly to ensure the backwashing effect. The four reflux branch pipes can collect the backwashing wastewater in time and return it to the coarse filter tank through the reflux main pipe for reprocessing, thereby realizing the recycling of water resources. The backwashing process is stable and reliable, which can effectively restore the filtering performance of the fine filter layer, extend its service life and reduce operating costs.

[0026] A method for using a sewage filtering device at a construction site comprises the following steps:

[0027] S1: The sewage from the construction site first enters the coarse filter tank, and the sewage is initially intercepted by the filter grille in the filter shell to remove larger debris. The sewage passes through the first filter screen and the second filter screen in turn to further filter smaller impurity particles. During the filtering process, the motor in the cleaning component drives the screw to rotate, so that the moving rod connected to the screw thread and slidingly connected to the slide rail moves. The steel brush at the lower end of the moving rod cleans the filter grille, the first filter screen and the second filter screen to prevent blockage. The cleaned debris enters the filter box through the impurity discharge groove and the through groove. After a period of time, the filter box is lifted by the lifting ear of the filter box to deal with the internal impurities;

[0028] S2: The outer shell of the sedimentation tank is connected to the coarse filter tank. The sewage after coarse filtration flows into the sedimentation tank. In the sedimentation tank, the sewage has an inverted cone bottom and obliquely staggered baffles, which slows down the flow rate of the sewage, so that the heavier particles such as silt in the sewage settle to the bottom of the shell under the action of gravity. The precipitated silt can be discharged regularly through the sand discharge valve;

[0029] S3: The precipitated sewage is transported to the oil-water separation tank through the first delivery pump and the first connecting pipe. The sewage enters the shell of the oil-water separation tank and is acted on by a separation plate with an inclination angle of 45° to 60°. The separation plate is made of polytetrafluoroethylene material, which is oleophilic and hydrophobic. The oil in the sewage adheres to the separation plate and floats upward along the separation plate. Finally, it is collected through the oil outlet pipe to achieve oil-water separation.

[0030] S4: The wastewater after oil-water separation is transported to the fine filter through the second connecting pipe, the second delivery pump and the lifting pipe. The wastewater enters the filter cartridge of the fine filter and passes through the first filter layer, the second filter layer, the third filter layer and the fourth filter layer in sequence, effectively removing the remaining fine particles and some soluble pollutants;

[0031] S5: After the filter layer of the fine filter has been used for a period of time, the backwashing procedure is started. The third delivery pump delivers the water in the disinfection tank to the spray pipe through the backwash pipe to backwash the filter layer. The solenoid valve is opened, and the backwash wastewater flows back to the coarse filter tank through the reflux branch pipe and the reflux main pipe for reprocessing.

[0032] S6: The finely filtered sewage enters the disinfection tank, where the ultraviolet lamps on both sides of the inner wall of the disinfection tank disinfect the sewage. The treated sewage that meets the standards can be output through the fourth delivery pump and the output pipe as needed. It can be used for sprinkling dust reduction at the construction site, washing vehicles, etc., or discharged to the designated drainage system.

[0033] Compared with the prior art, the present invention provides a sewage filtering device and method for a construction site, which has the following beneficial effects:

[0034] 1. The sewage filtration device and method at the construction site can gradually remove pollutants of different types and particle sizes in the sewage at the construction site by setting up a multi-stage treatment structure such as a coarse filter tank, a sedimentation tank, an oil-water separation tank, a fine filter and a disinfection tank. The filter grid, the first filter screen and the second filter screen in the coarse filter tank can effectively intercept debris particles from large to small. The shell bottom and the baffle of the sedimentation tank can efficiently precipitate heavy particles such as silt. The multiple filter layers of different particle sizes and materials in the fine filter further remove residual fine particles and soluble pollutants, which significantly improves the overall filtration quality of sewage.

[0035] 2. The sewage filtering device and method at the construction site, the cleaning component in the coarse filter tank drives the screw to rotate through the motor, so that the moving rod drives the steel brush to clean the filter component, which can effectively prevent the filter grid, the first filter screen and the second filter screen from being blocked. The backwashing system composed of the backwashing pipe, the spray pipe, the reflux branch pipe, the reflux main pipe and the solenoid valve of the fine filter can regularly backwash the filter layer to restore its filtering performance. The coordination of multiple components effectively avoids the problem of equipment blockage caused by impurity accumulation, greatly prolongs the service life of the entire sewage filtering device, reduces the frequency of equipment maintenance and replacement, and reduces the long-term operating cost;

[0036] 3. The sewage filtration device and method at the construction site, the filter box of the coarse filter tank is connected to the support frame by plugging, and is provided with corresponding debris discharge grooves and through grooves, as well as a lifting lug on the upper end of the filter box, which is convenient for cleaning debris. The structural design of each treatment unit of the entire sewage filtration device is reasonable, the operation process is clear, and it is easy for construction personnel to master and maintain. While ensuring the treatment effect, it improves the operability and management efficiency of the site;

[0037] 4. The sewage filtration device and method at the construction site is equipped with an inclined separation plate made of polytetrafluoroethylene material in the oil-water separation tank, which has excellent oleophilic and hydrophobic properties and can efficiently adsorb and separate the oil in the sewage, ensuring that the subsequent treatment links are not affected by the oil. This improves the treatment capacity of the entire sewage filtration system for complex construction sewage and reduces the risk of oil pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the three-dimensional structure of the sewage filtering device of the present invention from a first perspective;

[0039] Figure 2 A schematic diagram of the three-dimensional structure of the sewage filtering device of the present invention from a second viewing angle;

[0040] Figure 3 It is a schematic diagram of the three-dimensional structure of the sewage filtering device of the present invention from a third perspective;

[0041] Figure 4It is a schematic diagram of the split structure of the present invention;

[0042] Figure 5 This is a schematic diagram of the split structure of the coarse filtration tank and the sedimentation tank of the present invention;

[0043] Figure 6 This is a schematic diagram of the enlarged structure of the sedimentation tank of the present invention;

[0044] Figure 7 This is a schematic diagram of the split structure of the coarse filter tank of the present invention;

[0045] Figure 8 This is an enlarged structural diagram of the cleaning component of the present invention;

[0046] Fig. 9 This is a schematic diagram of the split structure of the oil-water separation tank of the present invention;

[0047] Fig.10 This is a schematic diagram of the split structure of the fine filter and the disinfection tank of the present invention;

[0048] Fig.11 It is a schematic diagram of the cross-sectional structure of the fine filter of the present invention.

[0049] Among them: 1. First chassis; 2. Sedimentation tank; 201. Shell; 202. Shell bottom; 203. Baffle; 204. Sand valve; 3. Coarse filter tank; 301. Filter shell; 302. Drain trough; 303. Filter grille; 304. First filter screen; 305. Second filter screen; 306. Carrier; 307. Filter box; 308. Through slot; 4. Cleaning assembly; 401. Slide rail; 402. Screw; 403. Motor; 404. Moving rod; 405. Steel brush; 5. First delivery pump; 6. First connecting pipe; 7. Second chassis; 8. Oil-water separation tank; 801. Shell body; 802, separation plate; 803, oil outlet pipe; 9, second connecting pipe; 10, third base frame; 11, second delivery pump; 12, lifting pipe; 13, fine filter; 1301, filter cartridge; 1302, first filter layer; 1303, second filter layer; 1304, third filter layer; 1305, fourth filter layer; 1306, spray pipe; 1307, backwash pipe; 1308, reflux branch pipe; 1309, reflux main pipe; 1310, solenoid valve; 14, disinfection tank; 15, ultraviolet lamp; 16, third delivery pump; 17, fourth delivery pump; 18, output pipe. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Embodiment 1:

[0052] like Figure 1-4 as well as Fig.10 As shown, the sewage filtering device for a construction site provided by the present invention comprises a first chassis 1 and a second chassis 7 on the right side of the first chassis 1, and a third chassis 10 on the left side of the first chassis 1, the upper end of the first chassis 1 is fixedly connected to a sedimentation tank 2, the upper end of the sedimentation tank 2 is fixedly connected to a coarse filter tank 3, the interior of the coarse filter tank 3 is fixedly connected to a cleaning component 4, the front end of the sedimentation tank 2 is fixedly connected to the input end of a first delivery pump 5 through a pipeline, the output end of the first delivery pump 5 is fixedly connected to a first connecting pipe 6, the output end of the first connecting pipe 6 is fixedly connected to an oil-water separation tank 8, the lower end of the oil-water separation tank 8 is fixedly connected to a second connecting pipe 9, and the second One end of the connecting pipe 9 away from the oil-water separation tank 8 is fixedly connected to the input end of the second delivery pump 11, and the output end of the second delivery pump 11 is fixedly connected to the lifting pipe 12. One end of the lifting pipe 12 away from the second delivery pump 11 is fixedly connected to a fine filter 13, and one end of the fine filter 13 close to the third base frame 10 is fixedly connected to a disinfection tank 14. Ultraviolet lamps 15 are arranged on both sides of the inner wall of the disinfection tank 14. The upper end of the disinfection tank 14 is fixedly connected to the input end of the third delivery pump 16 through a pipeline. The upper end of the disinfection tank 14 is fixedly connected to the input end of the fourth delivery pump 17 through a pipeline, and the output end of the fourth delivery pump 17 is fixedly connected to an output pipe 18.

[0053] See also Figures 5 and 6 The sedimentation tank 2 in the sewage filtering device includes an outer shell 201, a shell bottom 202, a baffle 203 and a sand discharge valve 204. The shell 201 is provided with a shell bottom 202 at the lower end, the shell bottom 202 is provided with a baffle 203 at the upper end, and the shell bottom 202 is provided with a sand discharge valve 204 at the lower end.

[0054] See also Figure 7 The coarse filter tank 3 in the sewage filtering device includes a filter housing 301, a drainage groove 302, a filter grille 303, a first filter screen 304, a second filter screen 305, a support frame 306, a filter box 307 and a through groove 308. The filter housing 301 is provided with a drainage groove 302 at the front end, the filter grille 303 is fixedly connected to the inside of the filter housing 301, the first filter screen 304 is arranged below the filter grille 303, and the second filter screen 305 is arranged below the first filter screen 304. The front end of the filter housing 301 is fixedly connected with a support frame 306, the upper end of the support frame 306 is plugged and connected with a filter box 307, and a through groove 308 is provided on a side of the filter box 307 close to the filter housing 301.

[0055] See also Figure 8The cleaning component 4 in the sewage filtering device includes a slide rail 401, a screw rod 402, a motor 403, a moving rod 404 and a steel brush 405. The center of the slide rail 401 is rotatably connected to the screw rod 402. One end of the screw rod 402 away from the impurity discharge groove 302 is fixedly connected to the output end of the motor 403. The slide rail 401, the screw rod 402 and the motor 403 are provided in two symmetrical and identical groups. The center of the two groups of slide rails 401 is provided with a moving rod 404, and the lower end of the moving rod 404 is fixedly connected to the steel brush 405.

[0056] See also Fig. 9 The oil-water separation tank 8 in the sewage filtering device includes a shell 801, a separation plate 802 and an oil outlet pipe 803. The separation plate 802 is fixedly connected to the inner wall of the shell 801, and the oil outlet pipe 803 is fixedly connected to the upper rear end of the shell 801.

[0057] See also Fig.11 The fine filter 13 in the sewage filtering device includes a filter cartridge 1301, a first filter layer 1302, a second filter layer 1303, a third filter layer 1304, a fourth filter layer 1305, a spray pipe 1306, a backwash pipe 1307, a reflux branch pipe 1308, a reflux main pipe 1309 and a solenoid valve 1310. The first filter layer 1302, the second filter layer 1303, the third filter layer 1304 and the fourth filter layer 1305 are fixedly connected inside the filter cartridge 1301. A spray pipe 1306 is arranged inside the filter cartridge 1301. The end of the spray pipe 1306 away from the filter cartridge 1301 is fixedly connected to the backwash pipe 1307. The side of the filter cartridge 1301 close to the sedimentation tank 2 is fixedly connected to the reflux branch pipe 1308. The end of the reflux branch pipe 1308 close to the sedimentation tank 2 is fixedly connected to the reflux main pipe 1309. The outer side of the reflux main pipe 1309 is fixedly connected to the solenoid valve 1310.

[0058] For further explanation, see Figure 6 The shell bottom 202 in the sewage filtering device is specifically an inverted cone structure, the baffles 203 are arranged in an inclined staggered manner at the upper end of the shell bottom 202, and the outer shell 201 is connected to the filter shell 301. In this way, the inverted cone shell bottom 202 is conducive to the sediment such as silt to gather to the bottom under the action of gravity, and the oblique staggered baffles 203 can effectively slow down the flow rate of sewage and make the sediment more fully precipitated.

[0059] For further explanation, see Figure 7The sewage filter device is provided with three impurity discharge grooves 302 of the same size, and the three impurity discharge grooves 302 correspond to the filter grille 303, the first filter screen 304 and the second filter screen 305 respectively. The through grooves 308 are provided with the same three. When the filter box 307 is plugged and connected with the carrier 306, the through grooves 308 correspond to the impurity discharge grooves 302, and the upper end of the filter box 307 is provided with a lifting lug. With such a configuration, the plug-in connection mode of the filter box 307 and the carrier 306 is convenient for installation and disassembly, and convenient for cleaning up debris, and the lifting lug design at the upper end of the filter box 307 further facilitates the staff to lift it for cleaning operations, thereby improving the convenience of maintenance.

[0060] Furthermore, the first filter screen 304 uses a 316 stainless steel mesh with a pore size of 5 mm to 10 mm, and the second filter screen 305 uses a 316 stainless steel mesh with a pore size of 2 mm to 3 mm. In this way, the first filter screen 304 and the second filter screen 305 use a 316 stainless steel mesh with a specific pore size, which has good corrosion resistance and can adapt to the complex chemical environment of sewage at the construction site.

[0061] Embodiment 2:

[0062] This example provides a further optimization solution based on the solution in Example 1.

[0063] Combination Figures 1 to 3 as well as Figure 8 In this example, three cleaning components 4 are provided, and the three cleaning components 4 correspond to the filter grille 303, the first filter screen 304 and the second filter screen 305 respectively. The screw rod 402 is threadedly connected to the moving rod 404, and the moving rod 404 is slidably connected to the slide rail 401. With such a configuration, the cleaning components 4 can fully cover the filtering area of ​​the coarse filter tank 3, prevent impurities from accumulating and clogging on the filter grille 303, the first filter screen 304 and the second filter screen 305, reduce the frequency of manual cleaning, and improve the automation and work efficiency of the entire coarse filter tank 3.

[0064] Combination Fig. 9 In this example, the tilt angle of the separation plate 802 is 45° to 60°, and the separation plate 802 is made of polytetrafluoroethylene. In this way, the inclined separation plate 802 is set, and the oil can float upward along the separation plate 802 during the flow of sewage in the oil-water separation tank 8. The separation plate 802 made of polytetrafluoroethylene has good oleophilic and hydrophobic properties, can efficiently absorb oil, and achieve better oil-water separation effect, greatly improving the ability to remove oil in sewage at the construction site, reducing the impact of oil on subsequent filtering links, and ensuring the treatment quality of the sewage filtration device.

[0065] Combination Fig.11In this example, the first filter layer 1302 uses a granite layer with a particle size of 5mm to 10mm, the second filter layer 1303 uses a quartz sand layer with a particle size of 2mm to 5mm, the third filter layer 1304 uses a quartz sand layer with a particle size of 0.5mm to 2mm, and the fourth filter layer 1305 uses an activated carbon layer. In this way, the granite layer of the first filter layer 1302 can first intercept relatively large residual particles in the sewage and perform preliminary fine filtration on the sewage. As the sewage passes through the second filter layer 1303 and the third filter layer 1304 with gradually decreasing particle sizes, the filtration accuracy is gradually improved, and finer impurities can be removed. Finally, the fourth filter layer 1305 with an activated carbon layer can absorb some soluble pollutants in the sewage. Through the combination of multiple filter layers, the deep removal of various types of pollutants in the sewage is achieved, so that the sewage is purified more thoroughly.

[0066] Furthermore, in this example, the spray pipes 1306 and the reflux branch pipes 1308 are provided with four identical ones, and the four spray pipes 1306 and the reflux branch pipes 1308 are respectively provided above the first filter layer 1302, the second filter layer 1303, the third filter layer 1304 and the fourth filter layer 1305, the output end of the reflux main pipe 1309 corresponds to the upper opening of the coarse filter tank 3, and the end of the backwash pipe 1307 away from the spray pipe 1306 is fixedly connected to the output end of the third delivery pump 16. In this way, the four spray pipes 1306 correspond to different filter layers, and each filter layer can be backwashed comprehensively and evenly to ensure the backwashing effect. The four reflux branch pipes 1308 can collect the backwashing wastewater in time, and return it to the coarse filter tank 3 through the reflux main pipe 1309 for reprocessing, so as to realize the recycling of water resources. The backwashing process is stable and reliable, and can effectively restore the filtering performance of the filter layer of the fine filter 13, extend its service life, and reduce the operating cost.

[0067] Working principle: The sewage from the construction site first enters the coarse filter tank 3, and the sewage is initially intercepted by the filter grille 303 in the filter shell 301 to remove larger debris. The sewage passes through the first filter screen 304 and the second filter screen 305 in turn to further filter smaller impurity particles. During the filtering process, the motor 403 in the cleaning component 4 drives the screw 402 to rotate, so that the moving rod 404, which is threadedly connected to the screw 402 and slidably connected to the slide rail 401, moves. The steel brush 405 at the lower end of the moving rod 404 cleans the filter grille 303, the first filter screen 304 and the second filter screen 305 to prevent blockage. The cleaned debris passes through the impurity discharge groove 302 and the through groove 308. The sewage enters the filter box 307, and after a period of time, the filter box 307 is lifted up through the lifting ears of the filter box 307 to treat the internal impurities; the shell 201 of the sedimentation tank 2 is connected with the coarse filter tank 3, and the sewage after coarse filtration flows into the sedimentation tank 2. In the sedimentation tank 2, the sewage has a reverse cone shape at the shell bottom 202 and has obliquely staggered baffles 203, so the sewage flow rate is slowed down, so that the heavier particles such as silt in the sewage are settled to the shell bottom 202 under the action of gravity, and the precipitated silt can be regularly discharged through the sand discharge valve 204; the precipitated sewage is transported to the oil-water separation tank 8 through the first delivery pump 5 and the first connecting pipe 6, and the sewage enters the shell 801 of the oil-water separation tank 8, and is inclined. The angle is 45° to 60°. The separation plate 802 is made of polytetrafluoroethylene material, which is oleophilic and hydrophobic. The oil in the sewage adheres to the separation plate 802 and floats upward along the separation plate 802, and is finally collected through the oil outlet pipe 803 to achieve oil-water separation. The sewage after oil-water separation is transported to the fine filter 13 through the second connecting pipe 9, the second delivery pump 11 and the lifting pipe 12. The sewage enters the filter cartridge 1301 of the fine filter 13 and passes through the first filter layer 1302, the second filter layer 1303, the third filter layer 1304 and the fourth filter layer 1305 in sequence, effectively removing the residual fine particles and some soluble pollutants. When the fine filter After the filter layer of the device 13 has been used for a period of time, the backwashing program is started, and the third delivery pump 16 delivers the water in the disinfection tank 14 to the spray pipe 1306 through the backwash pipe 1307 to backwash the filter layer. The solenoid valve 1310 is opened, and the backwashing wastewater flows back to the coarse filtration tank 3 through the reflux branch pipe 1308 and the reflux main pipe 1309 for reprocessing; the finely filtered sewage enters the disinfection tank 14, and the ultraviolet lamps 15 on both sides of the inner wall of the disinfection tank 14 disinfect the sewage. The treated sewage that meets the standards can be output through the fourth delivery pump 17 and the output pipe 18 as needed, which can be used for sprinkling dust reduction, vehicle washing, etc. at the construction site for reuse or discharged to a designated drainage system.

[0068] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sewage filtering device for a construction site, comprising a first base frame (1), a second base frame (7) on the right side of the first base frame (1), and a third base frame (10) on the left side of the first base frame (1), characterized in that: The upper end of the first base frame (1) is fixedly connected to a sedimentation tank (2), the upper end of the sedimentation tank (2) is fixedly connected to a coarse filter tank (3), the interior of the coarse filter tank (3) is fixedly connected to a cleaning assembly (4), the front end of the sedimentation tank (2) is fixedly connected to the input end of a first delivery pump (5) through a pipeline, the output end of the first delivery pump (5) is fixedly connected to a first connecting pipe (6), the output end of the first connecting pipe (6) is fixedly connected to an oil-water separation tank (8), the lower end of the oil-water separation tank (8) is fixedly connected to a second connecting pipe (9), and the end of the second connecting pipe (9) away from the oil-water separation tank (8) is fixedly connected to the input end of a second delivery pump (11). end, the output end of the second delivery pump (11) is fixedly connected to a lifting pipe (12), one end of the lifting pipe (12) away from the second delivery pump (11) is fixedly connected to a fine filter (13), one end of the fine filter (13) close to the third base frame (10) is fixedly connected to a disinfection pool (14), both sides of the inner wall of the disinfection pool (14) are provided with ultraviolet lamps (15), the upper end of the disinfection pool (14) is fixedly connected to the input end of the third delivery pump (16) through a pipeline, the upper end of the disinfection pool (14) is fixedly connected to the input end of the fourth delivery pump (17) through a pipeline, and the output end of the fourth delivery pump (17) is fixedly connected to an output pipe (18); The sedimentation tank (2) comprises an outer shell (201), a shell bottom (202), a flow blocker (203) and a sand discharge valve (204); the lower end of the outer shell (201) is provided with a shell bottom (202), the upper end of the shell bottom (202) is provided with a flow blocker (203), and the lower end of the shell bottom (202) is provided with a sand discharge valve (204); the coarse filter tank (3) comprises a filter shell (301), a debris discharge trough (302), a filter grille (303), a first filter screen (304), a second filter screen (305), a support frame (306), a filter screen box (307) and a through slot ( 308), the filter housing (301) is provided with a discharge groove (302) at the front end, a filter grille (303) is fixedly connected inside the filter housing (301), a first filter screen (304) is arranged below the filter grille (303), a second filter screen (305) is arranged below the first filter screen (304), a carrier frame (306) is fixedly connected to the front end of the filter housing (301), a filter screen box (307) is plugged and connected to the upper end of the carrier frame (306), and a through groove (308) is provided on a side of the filter screen box (307) close to the filter housing (301); The cleaning assembly (4) comprises a slide rail (401), a screw rod (402), a motor (403), a moving rod (404) and a steel brush (405); the center of the slide rail (401) is rotatably connected to the screw rod (402); one end of the screw rod (402) away from the impurity discharge groove (302) is fixedly connected to the output end of the motor (403); the slide rail (401), the screw rod (402) and the motor (403) are provided in two symmetrical and identical groups; the centers of the two groups of slide rails (401) are provided with moving rods (404); the lower ends of the moving rods (404) are fixedly connected to the steel brush (405); The oil-water separation tank (8) comprises a shell (801), a separation plate (802) and an oil outlet pipe (803); the separation plate (802) is fixedly connected to the inner wall of the shell (801); and the oil outlet pipe (803) is fixedly connected to the upper rear end of the shell (801); The fine filter (13) comprises a filter cartridge (1301), a first filter layer (1302), a second filter layer (1303), a third filter layer (1304), a fourth filter layer (1305), a spray pipe (1306), a backwash pipe (1307), a reflux branch pipe (1308), a reflux main pipe (1309) and a solenoid valve (1310), wherein the first filter layer (1302), the second filter layer (1303), the third filter layer (1304) and the fourth filter layer (1305) are fixedly connected inside the filter cartridge (1301). layer (1305), a spray pipe (1306) is arranged inside the filter cartridge (1301), one end of the spray pipe (1306) away from the filter cartridge (1301) is fixedly connected to a recoil pipe (1307), one side of the filter cartridge (1301) close to the sedimentation tank (2) is fixedly connected to a reflux branch pipe (1308), one end of the reflux branch pipe (1308) close to the sedimentation tank (2) is fixedly connected to a reflux main pipe (1309), and the outer side of the reflux main pipe (1309) is fixedly connected to a solenoid valve (1310).

2. A sewage filtering device for a construction site according to claim 1, characterized in that: The shell bottom (202) is in an inverted cone structure, the baffles (203) are arranged in an inclined and staggered manner at the upper end of the shell bottom (202), and the outer shell (201) and the filter shell (301) are in communication with each other.

3. The sewage filtering device for a construction site according to claim 1, characterized in that: The impurity removal grooves (302) are provided with three identical sizes, and the three impurity removal grooves (302) correspond to the filter grille (303), the first filter screen (304) and the second filter screen (305) respectively. The through grooves (308) are provided with three identical ones, and when the filter box (307) is plug-connected with the supporting frame (306), the through grooves (308) correspond to the impurity removal grooves (302), and the upper end of the filter box (307) is provided with a lifting ear.

4. The sewage filtering device for a construction site according to claim 1, characterized in that: The first filter screen (304) is made of a 316 stainless steel mesh with a pore size of 5 mm to 10 mm, and the second filter screen (305) is made of a 316 stainless steel mesh with a pore size of 2 mm to 3 mm.

5. The sewage filtering device for a construction site according to claim 1, characterized in that: The cleaning components (4) are provided with three identical ones, and the three cleaning components (4) respectively correspond to the filter grille (303), the first filter screen (304) and the second filter screen (305), the screw rod (402) and the moving rod (404) are threadedly connected, and the moving rod (404) and the slide rail (401) are slidably connected.

6. The sewage filtering device for a construction site according to claim 1, characterized in that: The inclination angle of the separation plate (802) is 45° to 60°, and the separation plate (802) is made of polytetrafluoroethylene material.

7. The sewage filtering device for a construction site according to claim 1, characterized in that: The first filter layer (1302) is made of a granite stone layer with a particle size of 5mm to 10mm, the second filter layer (1303) is made of a quartz sand layer with a particle size of 2mm to 5mm, the third filter layer (1304) is made of a quartz sand layer with a particle size of 0.5mm to 2mm, and the fourth filter layer (1305) is made of an activated carbon layer.

8. The sewage filtering device for a construction site according to claim 1, characterized in that: Four identical spray pipes (1306) and reflux branch pipes (1308) are provided. The four spray pipes (1306) and reflux branch pipes (1308) are respectively provided above the first filter layer (1302), the second filter layer (1303), the third filter layer (1304) and the fourth filter layer (1305). The output end of the reflux main pipe (1309) corresponds to the upper opening of the coarse filter tank (3). The end of the backwash pipe (1307) away from the spray pipe (1306) is fixedly connected to the output end of the third delivery pump (16).

9. A sewage filtering device for a construction site according to any one of claims 1 to 8, characterized in that: Here’s how to use it: S1: Sewage from the construction site first enters the coarse filter tank (3), and is initially intercepted by the filter grille (303) in the filter shell (301) to remove larger debris. The sewage then passes through the first filter screen (304) and the second filter screen (305) in sequence to further filter smaller impurity particles. During the filtering process, the motor (403) in the cleaning component (4) drives the screw rod (402) to rotate, so that the moving rod (404) threadedly connected to the screw rod (402) and slidably connected to the slide rail (401) moves. The steel brush (405) at the lower end of the moving rod (404) cleans the filter grille (303), the first filter screen (304) and the second filter screen (305) to prevent blockage. The cleaned debris enters the filter box (307) through the impurity discharge groove (302) and the through groove (308). After a period of time, the filter box (307) is lifted by the lifting lug of the filter box (307) to process the internal impurities. S2: The outer shell (201) of the sedimentation tank (2) is connected to the coarse filtration tank (3), and the sewage after coarse filtration flows into the sedimentation tank (2). In the sedimentation tank (2), the sewage has a reverse cone-shaped shell bottom (202) and obliquely staggered baffles (203), so the flow rate of the sewage is slowed down, so that heavier particles such as silt in the sewage settle to the shell bottom (202) under the action of gravity, and the precipitated silt can be discharged regularly through the sand discharge valve (204); S3: The precipitated sewage is transported to the oil-water separation tank (8) through the first delivery pump (5) and the first connecting pipe (6). The sewage enters the shell (801) of the oil-water separation tank (8) and is acted on by the separation plate (802) with an inclination angle of 45° to 60°. The separation plate (802) is made of polytetrafluoroethylene material, which is oleophilic and hydrophobic. The oil in the sewage adheres to the separation plate (802) and floats upward along the separation plate (802). Finally, it is collected through the oil outlet pipe (803) to achieve oil-water separation. S4: After the oil-water separation, the sewage is transported to the fine filter (13) through the second connecting pipe (9), the second delivery pump (11) and the lifting pipe (12). The sewage enters the filter cartridge (1301) of the fine filter (13), and passes through the first filter layer (1302), the second filter layer (1303), the third filter layer (1304) and the fourth filter layer (1305) in sequence, effectively removing the remaining fine particles and some soluble pollutants; S5: After the filter layer of the fine filter (13) has been used for a period of time, the backwashing procedure is started, and the third delivery pump (16) delivers the water in the disinfection tank (14) to the spray pipe (1306) through the backwash pipe (1307) to backwash the filter layer. The solenoid valve (1310) is opened, and the backwash wastewater flows back to the coarse filter tank (3) through the reflux branch pipe (1308) and the reflux main pipe (1309) for reprocessing; S6: The finely filtered sewage enters the disinfection tank (14), and the ultraviolet lamps (15) on both sides of the inner wall of the disinfection tank (14) disinfect the sewage. The treated sewage that meets the standards can be output through the fourth delivery pump (17) and the output pipe (18) as needed, and can be reused for sprinkling dust at the construction site, washing vehicles, etc., or discharged to a designated drainage system.

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