Rainwater and sewage mixed flow outlet treatment device and method

Abstract

The present invention discloses a rainwater-sewage mixed flow outlet treatment device and method, the device comprises a cylinder, a water inlet main pipe, a drainage overflow pipe and a water outlet pipe are connected to the cylinder, a basket grille, a sewage biofilm filtration treatment device and a sewage lifting device are arranged inside the cylinder, a filter hole is arranged on the outer wall of the basket grille, the basket grille is connected to the water inlet main pipe, the basket grille is detachably connected to the water inlet main pipe, the sewage biofilm filtration treatment device comprises a shell, an MBR membrane is connected inside the shell, the shell is connected to the sewage lifting device through a water inlet branch pipe, and a float valve is connected to the drainage overflow pipe. The present invention also discloses a method for treating a rainwater-sewage mixed flow outlet. The present invention can quickly and efficiently treat and separate pollutants in a mixed fluid, greatly improving the pollutant treatment efficiency; the structure is simple, the operation difficulty is low, the investment cost is low, the floor space is small, and the construction period is short, and it is easy to implement.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a rainwater-sewage mixed flow outlet treatment device and method. Background Art

[0002] Due to incomplete separation of rainwater and sewage, during the rainy season, while rainwater is discharged into the river through the stormwater pipe network, a large amount of domestic sewage is also mixed into the stormwater pipe to form a mixed rainwater and sewage outlet, causing the mixed rainwater and sewage to directly enter the surface water body (river, lake or reservoir), resulting in increasingly serious surface water pollution.

[0003] In order to promote water environment management and control pollution of rivers, reservoirs, lakes and other water bodies, the following treatment methods are generally adopted to address the above-mentioned problems of mixed rainwater and sewage outlets: 1) Reconstruction of pipeline networks; 2) Construction of conversion wells and laying of pipelines before the rainwater pipes enter the river mouth to intercept the initial rainwater into the municipal pipeline network; 3) Targeted use of biotechnology, floating bed technology, aeration, etc. at the mixed rainwater and sewage outlets to centrally treat pollutants contained in sewage and initial rainwater.

[0004] However, the above treatment methods have the following disadvantages: 1) The treatment method of completely realizing the separation of rainwater and sewage by transforming the pipeline network requires clarifying the sewage source of each community. This method is difficult to operate, has high investment costs and a long construction period; 2) The method of building a conversion well and laying pipes before the rainwater pipe enters the river to intercept the initial rainwater into the municipal pipeline network often causes more sewage to enter the water body, and even the river water backflows into the sewage system, causing the sewage treatment capacity and load of the sewage plant to be too large, and it is impossible to effectively solve the problem of rainwater and sewage mixing into the river; 3) The method of using biotechnology, floating bed technology, aeration, etc. to treat pollutants in the water at the rainwater and sewage mixed outlet requires occupying a large land area or water surface area, and the pollutant treatment efficiency is low, and it is impossible to achieve a good pollutant separation effect.

[0005] In summary, the existing methods for treating mixed rainwater and sewage outlets have problems such as difficult operation, high investment cost, long construction period, large occupied area, and low pollutant treatment efficiency, and cannot effectively solve the problem of mixed rainwater and sewage flowing into rivers. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a rainwater-sewage mixed flow outlet treatment device and method, which can quickly and efficiently treat and separate pollutants in the mixed flow, greatly improving the pollutant treatment efficiency; it has a simple structure, low operation difficulty, low investment cost, small footprint and short construction period, and is easy to implement.

[0007] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0008] A rainwater and sewage mixed flow outlet treatment device comprises a cylinder body, to which a water inlet main pipe, a drainage overflow pipe and a water outlet pipe are connected; a basket grille, a sewage biofilm filtration treatment device and a sewage lifting device are arranged inside the cylinder body; filter holes are arranged on the outer wall of the basket grille; the basket grille is communicated with the water inlet main pipe; the basket grille is detachably connected to the water inlet main pipe; the sewage biofilm filtration treatment device comprises a shell body, to which an MBR membrane is connected; the shell body is connected to the sewage lifting device through a water inlet branch pipe; and a float valve is connected to the drainage overflow pipe.

[0009] In one embodiment, the MBR membrane is a circular flat ultrafiltration membrane.

[0010] In one embodiment, the circular flat ultrafiltration membrane is a nano-membrane.

[0011] In one embodiment, a rotating shaft is connected inside the shell, one end of the rotating shaft is connected to the driving motor, and the other end of the rotating shaft is connected to a scraper, and the scraper is in contact with the MBR membrane.

[0012] In one embodiment, the scraping member is connected to the rotating shaft via a connecting rod, and the connecting rod is a telescopic rod.

[0013] In one embodiment, the scraper is provided with a plurality of bristles, and an end of the bristles that contacts the MBR membrane is provided with an arc-shaped head.

[0014] In one of the embodiments, a mounting platform is provided inside the cylinder, the sewage lifting device is connected to the mounting platform, and the top height of the drainage overflow pipe is not greater than the height of the mounting platform.

[0015] In one embodiment, the sewage lifting device includes a lifting pump and a liquid level sensor, and the lifting pump and the liquid level sensor are both electrically connected to the controller.

[0016] In one embodiment, the water inlet branch pipe and the water outlet pipe are both provided with electric valves, and the electric valves are electrically connected to the controller.

[0017] A method for treating a mixed rainwater and sewage outlet, comprising:

[0018] The rainwater and sewage mixed fluid flows into the basket grille through the water inlet main pipe, and after being filtered by the basket grille, flows out to the cylinder outside the basket grille to form the primary filtered fluid;

[0019] When the water level of the primary filtered fluid inside the cylinder cannot rise to open the float valve, and the water level of the primary filtered fluid inside the cylinder rises to the set minimum water level value, the sewage lifting device is opened, and the primary filtered fluid is extracted and lifted to the inside of the sewage biofilm filtration treatment device through the water inlet branch pipe, and after physical filtration and biological treatment by the MBR membrane, secondary filtered fluid is formed and discharged from the outlet pipe to the outside of the cylinder; when the water level of the primary filtered fluid inside the cylinder can rise to open the float valve, the sewage lifting device is closed, the sewage biofilm filtration treatment device stops working, and the primary filtered fluid is directly discharged to the outside of the cylinder through the drainage overflow pipe.

[0020] The present invention has the following beneficial effects: the rainwater and sewage mixed flow outlet treatment device and method of the present invention can quickly and efficiently treat and separate pollutants in the mixed flow, and can also effectively remove suspended pollutants, greatly improving the pollutant treatment efficiency and pollutant separation effect; it is easy to operate, simple in structure, low in investment cost, small in footprint and short in construction period, and is easy to install and promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the rainwater and sewage mixed flow outlet treatment device of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the rainwater-sewage mixed flow outlet treatment device of the present invention from another angle;

[0023] Figure 3 It is a top view of the rainwater and sewage mixed flow outlet treatment device of the invention;

[0024] Figure 4 It is the scraping principle diagram of the scraping piece;

[0025] Figure 5 yes Figure 4 A partial enlarged view of the middle A;

[0026] In the figure: 1, cylinder, 2, water inlet main pipe, 3, drainage overflow pipe, 4, water inlet branch pipe, 5, water outlet pipe, 6, basket grille, 61, through hole, 62, opening, 7, sewage biofilm filtration treatment device, 71, shell, 72, drive motor, 73, shaft, 74, connecting rod, 75, scraper, 751, bristles, 752, arc head, 76, MBR membrane, 8, sewage lifting device, 9, float valve, 10, installation platform, 11, electric valve, 12, ladder, 13, bottom plate. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] like Figure 1-Figure 3 As shown, this embodiment discloses a rainwater-sewage mixed flow outlet treatment device, including a cylinder 1, to which a water inlet main pipe 4, a drainage overflow pipe 3 and a water outlet pipe 5 are connected, and a basket grille 6, a sewage biofilm filtration treatment device 7 and a sewage lifting device 8 are arranged inside the cylinder 1; for the convenience of showing the internal structure, Figure 1 and Figure 2 Only a part of the structure of the cylinder 1 is shown schematically. In actual situation, the cylinder 1 is a circumferentially closed cylindrical structure.

[0029] One end of the water inlet main pipe 2 can be connected to the rainwater and sewage mixed flow pipe or sewage outlet of the river bank, and the other end is connected to the basket grille 6. The basket grille 6 is detachably connected to the water inlet main pipe 2, so that the basket grille 6 can be removed and cleaned; the outer wall of the basket grille 6 is provided with filtering holes, so as to perform the initial filtration of the sewage entering the basket grille 6, and the filtered sewage flows into the cylinder 1 through the basket grille 6. The impurities and particulate matter with larger particle sizes produced by the filtration remain in the basket grille 6. When the above-mentioned impurities and particulate matter accumulate to a certain extent in the basket grille 6, the basket grille 6 is removed from the water inlet main pipe and taken out from the cylinder 1, and the substances inside the basket grille 6 can be cleaned;

[0030] The sewage biofilm filtration treatment device 7 includes a shell 71, and an MBR (Membrane Bio-Reactor) membrane 76 is connected to the inside of the shell 71, which can perform fine filtration and biological treatment on the sewage. The shell 71 is connected to the sewage lifting device 8 through the water inlet branch pipe 4, and a float valve 9 is connected to the drainage overflow pipe 3. The float valve 9 is a valve that uses the buoyancy principle to open or close. When the buoyancy increases to a certain extent, the float valve 9 rotates, so that the drainage overflow pipe 3 is conductive. When the buoyancy is small, the float valve 9 cannot be driven to rotate, and the drainage overflow pipe 3 is in a closed state.

[0031] In one embodiment, a through hole 61 is provided on the basket lifting grille 6, and one end of the water inlet main pipe 2 is inserted into the through hole 61. This method facilitates the disassembly of the basket lifting grille 6. When the basket lifting grille 6 needs to be cleaned, the basket lifting grille 6 can be directly pulled out and removed from the water inlet main pipe 2.

[0032] In one embodiment, an opening is provided at the top of the basket grille 6 to facilitate dumping of filtered impurities in the basket grille 6. For example, the basket grille 6 may be a rectangular box, the top surface of which is provided with an opening 62, and the remaining surfaces are mesh panels with a plurality of filtering holes.

[0033] In one embodiment, a lifting rope is connected to the basket grille 6, and a pulley block is provided on the upper part of the cylinder 1. The lifting rope is wound around the pulley block, so that the basket grille 6 is lifted up by the pulley mechanism to clean the basket grille 6. It can be understood that the lifting rope can also be a chain or a steel cable.

[0034] In one embodiment, the MBR membrane 76 adopts a circular flat ultrafiltration membrane. The circular flat ultrafiltration membrane has good water permeability, good anti-fouling performance, is not easy to be blocked, contains a support layer with high mechanical strength, is not easy to be damaged and leaked, can filter tiny impurities, efficiently remove suspended matter, and can attach a large number of microorganisms, thereby promoting the substantial degradation of pollutants.

[0035] The circular flat ultrafiltration membrane includes a filter mesh layer, the upper surface of which is bonded with a polymer semipermeable membrane, and the lower surface of which is also bonded with a polymer semipermeable membrane, so as to achieve high hydrophilicity and good anti-fouling properties.

[0036] Furthermore, the circular flat ultrafiltration membrane adopts a nano-membrane, whose pore size reaches the nano-level, which can effectively filter out fine impurities and improve the filtration level.

[0037] In one embodiment, the housing 71 of the sewage biofilm filtration treatment device 7 may be made of stainless steel.

[0038] like Figure 4-Figure 5 As shown, in one embodiment, a rotating shaft 73 is connected inside the housing 71, one end of the rotating shaft 73 is connected to the driving motor 72, and the other end is connected to a scraper 75, and the scraper 75 is in contact with the MBR membrane 76. The driving motor 72 can drive the rotating shaft 73 to rotate, thereby driving the scraper 75 to rotate on the membrane surface of the MBR membrane 76, thereby achieving the effect of wiping the sludge on the membrane surface by the scraper 75, and can better prevent the MBR membrane 76 from being blocked.

[0039] Furthermore, the scraper 75 is connected to the rotating shaft 73 via a connecting rod 74, and the connecting rod 74 is a telescopic rod, so that the radial position of the scraper 75 on the MBR membrane 76 can be adjusted by adjusting the length of the telescopic rod, thereby adjusting the scraping range of the MBR membrane 76 and enhancing the scraping and cleaning effect.

[0040] In one embodiment, if Figure 5 As shown, the scraper 75 is provided with a plurality of bristles 751 , which are in contact with the MBR membrane 76 , and an arc-shaped head 752 is provided at one end of the bristles 751 in contact with the MBR membrane 76 to prevent the end of the bristles 751 from being too sharp and causing wear to the MBR membrane 76 .

[0041] The arc-shaped head 752 may be made of rubber or other soft materials to better protect the membrane surface of the MBR membrane 76 .

[0042] In one embodiment, an installation platform 10 is provided inside the cylinder 1, the sewage lifting device 8 is connected to the installation platform 10, and the top height of the drainage overflow pipe 3 is not greater than the height of the installation platform 10 to prevent the water flow from submerging the installation platform 10.

[0043] In one embodiment, the center height of the basket grille 6 is equal to the height of the mounting platform 10 , so that the operator can use the mounting platform 10 to install and disassemble the basket grille 6 or perform other operations.

[0044] In one embodiment, the sewage lifting device 8 includes a lifting pump and a liquid level sensor, and the lifting pump and the liquid level sensor are electrically connected to the controller. The liquid level sensor is used to detect the water level data in the cylinder and transmit the water level data to the controller, and the controller is used to control the opening or closing of the lifting pump. For example, the controller can control the opening or closing of the lifting pump according to the water level data. When the water level data reaches the set minimum water level value, the controller can control the opening of the lifting pump, so as to use the lifting pump to extract the sewage in the cylinder into the sewage biofilm filtration treatment device, otherwise, the lifting pump is controlled to be closed to stop working.

[0045] In one embodiment, an electric valve 11 is provided on both the water inlet branch pipe 4 and the water outlet pipe 5, and the electric valve 11 is electrically connected to the controller to control the opening and closing of the water inlet branch pipe 4 and the water outlet pipe 5 through the controller.

[0046] In one embodiment, if Figure 2 As shown, a ladder 12 is also connected to the interior of the cylinder 1, so that operators can regularly enter the interior of the cylinder 1 to clean the foreign particles in the basket grille 6 or to inspect and maintain the equipment.

[0047] In one embodiment, the bottom of the cylinder 1 is connected to a base plate 13, and the base plate 13 is provided with mounting holes for passing expansion bolts or anchor bolts to fix the above-mentioned rainwater and sewage mixed flow outlet treatment device on the foundation through the expansion bolts or anchor bolts.

[0048] In one embodiment, the cylinder 1 is made of stainless steel or fiberglass, which has good corrosion resistance and structural strength.

[0049] This embodiment also discloses a method for treating a mixed rainwater and sewage outlet, including:

[0050] The rainwater-sewage mixed fluid flows into the basket grille 6 through the water inlet main pipe 2, and is filtered by the basket grille 6 to remove large particles of impurities and pollutants, and then flows out to the inside of the cylinder 1 outside the basket grille 6 to form a primary filtered fluid;

[0051] When the initial amount of rainwater is small or only sewage is discharged on sunny days, the water level of the primary filtered fluid inside the cylinder 1 cannot rise to open the float valve 9 (the buoyancy of the primary filtered fluid inside the cylinder 1 is not enough to open the float valve 9). At this time, when the water level of the primary filtered fluid inside the cylinder 1 rises to the set minimum water level, the sewage lifting device 8 is opened, and the sewage lifting device 8 extracts and lifts the primary filtered fluid through the water inlet branch pipe 4 to the inside of the sewage biofilm filtration treatment device 7, and forms a secondary filtered fluid after physical filtration and biological treatment by the MBR membrane 76 and is discharged from the outlet pipe into the river, reservoir or lake; when the amount of rainwater is large, the water level of the primary filtered fluid inside the cylinder 1 can quickly rise to open the float valve 9, the sewage lifting device 8 is closed, and the sewage biofilm filtration treatment device 7 stops working. At this time, the pollution concentration of the primary filtered fluid is low (due to the large amount of rain, a large amount of rainwater itself can dilute the rain and sewage mixed fluid), and the primary filtered fluid is directly discharged into the river, reservoir or lake through the drainage overflow pipe 3.

[0052] In the above process, when the sewage lifting device 8 is closed, the water inlet branch pipe 4 and the water outlet pipe 5 can also be closed at the same time to ensure safety.

[0053] It can be understood that when the water level of the primary filtered fluid inside the cylinder 1 can rise to the point where the float valve 9 is opened, it means that the rainfall is heavy, and a large amount of rainwater itself can dilute the sewage. Therefore, the pollution degree of the rainwater and sewage mixed fluid flowing into the water inlet main 2 at this time is relatively low. Therefore, at this time, it only needs to be discharged after simple physical filtration through the basket grille 6, and there is no need to start the sewage biofilm filtration treatment device 7 for secondary filtration treatment. In addition, when the rainfall is heavy, the water flow velocity and water volume entering the cylinder 1 are relatively large. At this time, if the sewage lifting device 8 and the sewage biofilm filtration treatment device 7 are turned on, it is easy to cause a large impact on the equipment.

[0054] Furthermore, the water level data of the primary filtered fluid inside the cylinder 1 is collected by a liquid level sensor. When the collected water level data reaches the set minimum water level value, the controller controls the lift pump to start, thereby using the lift pump to pump the sewage in the cylinder 1 to the sewage biofilm filtration treatment device 7 for treatment. The above setting avoids starting the lift pump when the water level data is too low (the water level data is less than or equal to the minimum water level value).

[0055] Furthermore, both the water inlet branch pipe 4 and the water outlet pipe 5 are provided with electric valves 11 , and the controller automatically controls the opening and closing of the water inlet branch pipe 4 and the water outlet pipe 5 by controlling the electric valves 11 .

[0056] The secondary filtered fluid formed after filtering by the MBR membrane 76 in the above device can reach the effluent level above Class A of GB18918-2002, and thus can be directly discharged into rivers, reservoirs or lakes;

[0057] In one embodiment, the diameter of the drainage overflow pipe 3 is 100-1000 mm.

[0058] The application effect of the rainwater and sewage mixed flow outlet treatment device of the above embodiment is illustrated by taking the Suzhou city river bathroom outlet as an example. The Suzhou city river bathroom outlet has a daily sewage discharge of about 20t / d, and due to the complex upstream pipe network, there is no way to find the source and completely intercept and pipe the sewage; and the river bank is directly at the door of the bathroom, and there is no place to place the conventional integrated sewage treatment equipment, which leads to serious black and smelly water in this section of the river. In order to improve this problem, a rainwater and sewage mixed flow outlet treatment device of the above embodiment with a diameter of 2m and a height of 2m is set at the outlet. The diameter of the water inlet main pipe 2 is 300mm. The revetment pipe mouth is connected to the water inlet main pipe 2 with a soft joint. After use, the original COD (chemical oxygen demand) of 91mg / L and ammonia nitrogen of 19mg / L can be treated into a transparent water body with COD25mg / L and ammonia nitrogen of 0.8mg / L, which greatly reduces the pollution degree of the river water by the outlet.

[0059] The rainwater and sewage mixed flow outlet treatment device of the above-mentioned embodiment has a simple structure, low investment cost, small footprint, short construction period, easy installation and operation, and can be used for the treatment of rainwater and sewage mixed flow at pipe outlets of lakes, reservoirs, and rivers where sewage is not completely intercepted. It has a wide range of applications and can also better deal with emergencies such as rainwater and sewage mixed flow and incomplete sewage interception caused by the rainy season. The device combines a sewage biofilm filtration treatment device 7 with an MBR membrane 76 with a sewage lifting device 8, which can quickly and efficiently degrade pollutants in sewage and initial rainwater, and can also effectively remove suspended pollution, greatly improving the pollutant treatment efficiency and pollutant removal. The separation effect, combined with the setting of the drainage overflow pipe 3, can make a large flow of low-pollution concentration rainwater directly overflow and discharge after physical filtration through the basket grille 6, which can reduce the impact on the equipment while ensuring that the river is not polluted; through the coordinated design of the sewage biofilm filtration treatment device 7, the sewage lifting device 8 and the drainage overflow pipe 3, the above-mentioned treatment device can flexibly select different filtration methods according to the flow of the mixed rain and sewage outlet, so as to achieve optimal utilization of resources; the degree of automation is greatly improved, and it is only necessary to regularly take out and dump the polluted filtrate in the basket grille 6, which saves a lot of labor.

[0060] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A rainwater-sewage mixed flow outlet treatment device, characterized in that: It comprises a cylinder, to which a water inlet main pipe, a drainage overflow pipe and a water outlet pipe are connected, a basket grille, a sewage biofilm filtration treatment device and a sewage lifting device are arranged inside the cylinder, a filtering hole is arranged on the outer wall of the basket grille, the basket grille is connected to the water inlet main pipe, the basket grille is detachably connected to the water inlet main pipe, the sewage biofilm filtration treatment device comprises a shell, an MBR membrane is connected inside the shell, the shell is connected to the sewage lifting device through a water inlet branch pipe, and a float valve is connected to the drainage overflow pipe; The MBR membrane adopts a circular flat ultrafiltration membrane; an installation platform is arranged inside the cylinder, the sewage lifting device is connected to the installation platform, and the top height of the drainage overflow pipe is not greater than the height of the installation platform.

2. The rainwater-sewage mixed flow outlet treatment device according to claim 1, characterized in that: The circular flat ultrafiltration membrane adopts a nano-membrane.

3. The rainwater-sewage mixed flow outlet treatment device according to claim 1, characterized in that: A rotating shaft is connected inside the shell, one end of the rotating shaft is connected to a driving motor, and the other end of the rotating shaft is connected to a scraper, and the scraper is in contact with the MBR membrane.

4. The rainwater-sewage mixed flow outlet treatment device according to claim 3, characterized in that: The scraping member is connected to the rotating shaft via a connecting rod, and the connecting rod is a telescopic rod.

5. The rainwater-sewage mixed flow outlet treatment device according to claim 3, characterized in that: The scraper is provided with a plurality of bristles, and an end of the bristles contacting the MBR membrane is provided with an arc-shaped head.

6. The rainwater-sewage mixed flow outlet treatment device according to claim 1, characterized in that: The sewage lifting device comprises a lifting pump and a liquid level sensor, and both the lifting pump and the liquid level sensor are electrically connected to a controller.

7. The rainwater-sewage mixed flow outlet treatment device according to claim 6, characterized in that: The water inlet branch pipe and the water outlet pipe are both provided with electric valves, and the electric valves are electrically connected to the controller.

8. A method for treating a mixed rainwater and sewage outlet, characterized in that: The rainwater-sewage mixed flow outlet treatment device according to claim 1 is used, and the rainwater-sewage mixed flow outlet treatment method comprises: The rainwater and sewage mixed fluid flows into the basket grille through the water inlet main pipe, and after being filtered by the basket grille, flows out to the cylinder outside the basket grille to form the primary filtered fluid; When the water level of the primary filtered fluid inside the cylinder cannot rise to open the float valve, and the water level of the primary filtered fluid inside the cylinder rises to the set minimum water level value, the sewage lifting device is opened, and the primary filtered fluid is extracted and lifted to the inside of the sewage biofilm filtration treatment device through the water inlet branch pipe, and after physical filtration and biological treatment by the MBR membrane, secondary filtered fluid is formed and discharged from the outlet pipe to the outside of the cylinder; when the water level of the primary filtered fluid inside the cylinder can rise to open the float valve, the sewage lifting device is closed, the sewage biofilm filtration treatment device stops working, and the primary filtered fluid is directly discharged to the outside of the cylinder through the drainage overflow pipe.

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