Rain and sewage overflow sewage high-efficiency purification equipment and process

Abstract

The application relates to a rain and sewage overflow sewage high-efficiency purification device and process, and relates to the technical field of sewage treatment. The purification device comprises a regulating and storing tank, an SSgo solid-liquid rapid separation device, a high-speed air flotation device, a disinfection tank, a dosing mechanism, a disinfection mechanism, a squeezing dehydration device and a sludge dehydration device. The regulating and storing tank, the SSgo solid-liquid rapid separation device, the high-speed air flotation device and the disinfection tank are sequentially and orderly communicated. The dosing mechanism is communicated with the high-speed air flotation device, and the dosing mechanism is internally provided with a coagulant and a flocculant. The disinfection mechanism is communicated with the disinfection tank, and the disinfection mechanism is internally provided with a disinfectant. The squeezing dehydration device is communicated with the SSgo solid-liquid rapid separation device, the sludge dehydration device is communicated with the high-speed air flotation device, and the sewage outlets of the sludge dehydration device and the squeezing dehydration device are both communicated with the regulating and storing tank. The purification device has the advantages of good purification effect, high treatment speed, small land occupation, convenient operation and maintenance and the like.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and in particular to a high-efficiency purification device and process for rainwater and sewage overflow. Background Technology

[0002] In recent years, with the rapid development of environmental protection in my country, the construction of urban sewage treatment plants has also accelerated. However, most cities in my country still retain combined sewer systems, which generate a large amount of rainwater and sewage overflows during the flood season. Due to the complexity of rainwater and sewage overflows and the randomness and variability of the overflow process, overflow pollution has become a persistent problem in urban drainage systems, facing many challenges.

[0003] In February 2022, the Ministry of Ecology and Environment issued the "Notice on Conducting Pollution Intensity Analysis During the Flood Season to Promote the Solution of Outstanding Water Environment Problems," requiring all localities to conduct pollution intensity monitoring and analysis during the flood season according to local conditions, and to take effective measures to improve the pollution situation of river sections. Some regions have also carried out treatment work on stormwater and sewage overflows and black and odorous water bodies. Therefore, there is an urgent need for some mature and efficient treatment technologies to solve the problems of stormwater and sewage overflows and black and odorous water bodies.

[0004] Existing stormwater and sewage overflows have the following characteristics:

[0005] 1. Rainwater and sewage overflows are non-point source pollution, characterized by their suddenness and discontinuity. This sewage mainly originates from rain during the flood season or snowfall in winter, which washes over buildings, roads, and other structures and facilities.

[0006] 2. Under normal circumstances, the initial stormwater overflow sewage contains a high content of pollutants. As rainfall (snow) continues, the polluted surface is constantly washed away, and the pollutant content gradually decreases until it reaches a relatively stable concentration.

[0007] 3. Due to the different forms of stormwater and sewage overflow, the highest values ​​of pollutant indicators in the initial stormwater and sewage overflow are already far higher than those in typical urban domestic sewage, and the composition of stormwater and sewage overflow is very different from that of domestic sewage.

[0008] It is known that the composition and content of pollutants in the sewage generated by rainwater overflow are difficult to determine. Therefore, directly incorporating the sewage generated by rainwater overflow into the urban domestic sewage treatment system can ensure the purification effect of the sewage generated by rainwater overflow on the one hand, and on the other hand, it will also put a greater burden on the domestic sewage treatment system during periods of high rainfall.

[0009] To address the aforementioned issues, existing rapid purification technologies for rainwater and sewage overflows mainly include the following four types: hydrocyclone, coagulation sedimentation, MBR membrane filtration / fiber disc filter filtration, and super magnetic separation.

[0010] The four methods mentioned above all use physical filtration, which can only filter insoluble pollutants in wastewater and cannot remove other dissolved pollutants. Summary of the Invention

[0011] The purpose of this application is to provide a system and process for efficiently purifying rainwater and sewage overflow.

[0012] Firstly, the high-efficiency sewage purification equipment for rainwater and sewage overflow provided in this application adopts the following technical solution:

[0013] A high-efficiency sewage purification device for rainwater and sewage overflow includes a regulating tank, an SSgo solid-liquid rapid separation device, a high-speed air flotation device, a disinfection tank, a dosing mechanism, a disinfection unit, a pressing and dewatering device, and a sludge dewatering device. The regulating tank, the SSgo solid-liquid rapid separation device, the high-speed air flotation device, and the disinfection tank are sequentially connected. The dosing mechanism is connected to the high-speed air flotation device and contains coagulant and flocculant. The disinfection unit is connected to the disinfection tank and contains disinfectant. The pressing and dewatering device is connected to the SSgo solid-liquid rapid separation device, and the sludge dewatering device is connected to the high-speed air flotation device. The sewage outlets of both the sludge dewatering device and the pressing and dewatering device are connected to the regulating tank.

[0014] By adopting the above technical solution, wastewater can enter the purification equipment and pass through the SSgo solid-liquid rapid separation device, high-speed air flotation device, and disinfection tank in sequence to remove insoluble impurities, soluble impurities, and pathogens from the wastewater before being discharged from the purification equipment, thus achieving wastewater purification. Furthermore, the installation of a pressing and dewatering device and a sludge pushing device re-presses the filtered impurities and discharges the filtrate back into the regulating tank, allowing the wastewater containing the filtered impurities to be purified again, reducing the possibility of wastewater overflowing into the environment.

[0015] Optionally, a bar screen filter is provided on one side of the regulating tank. The bar screen filter is located before the regulating tank along the flow direction of sewage in the purification equipment. The regulating tank and the bar screen filter are interconnected. A coarse bar screen is provided in the bar screen filter.

[0016] By adopting the above technical solution, the coarse screen in the bar filter tank can intercept large pollutants such as floating garbage in the sewage, reducing the amount of pollutants in the sewage discharged into the regulating tank.

[0017] Optionally, one end of the coarse screen along its conveying direction is provided with a press capable of pressing and dehydrating pollutants, the press being interconnected with the coarse screen and the outlet of the press being interconnected with the regulating tank.

[0018] By adopting the above technical solution, the press can press and dehydrate the pollutants intercepted by the coarse screen. Furthermore, since the outlet of the press is connected to the storage tank, the wastewater pressed out of the pollutants by the press can be discharged back into the storage tank, allowing the wastewater to re-enter the purification equipment for purification.

[0019] Optionally, the high-speed air flotation device is equipped with a high-speed mixer, which is connected to the dosing mechanism and is also connected to an air compressor.

[0020] By adopting the above technical solution, the high-speed mixer and the dosing mechanism are interconnected, so that the sewage can be fully mixed with the agent. The air compressor can introduce compressed air into the high-speed mixer, which can accelerate the mixing and reaction of sewage and corresponding agents, and accelerate the separation of pollutants and water in sewage.

[0021] Optionally, a sludge tank is provided between the sludge dewatering device and the high-speed air flotation device. The sludge tank is interconnected with both the high-speed air flotation device and the sludge dewatering device. A mixer is provided inside the sludge tank.

[0022] By adopting the above technical solution, the sludge tank can store the sludge generated by the high-speed air flotation device, and the mixer can agitate the sludge, so that the sludge can be evenly distributed in the sludge tank, thereby reducing the occurrence of sedimentation, and then discharged into the sludge dewatering equipment.

[0023] Optionally, the regulating tank is provided with a sedimentation tank, and the sedimentation tank is provided with a baffle. The baffle is located between the inlet and outlet of the sedimentation tank and separates the inlet and outlet of the sedimentation tank.

[0024] By adopting the above technical solution, the sedimentation tank is set up with baffles separating the inlet and outlet of the sedimentation tank, so that the sewage in the inlet will not disturb the water in the outlet, and the water discharged from the outlet has undergone sedimentation, reducing the impurities in the water.

[0025] Optionally, the disinfection pool is also equipped with a cleaning device, which is connected to the regulating tank and the disinfection pool, and the cleaning device can circulate water from the disinfection pool into the regulating tank.

[0026] By adopting the above technical solution, the cleaning device allows the purified water in the disinfection tank to be discharged back into the storage tank, thus cleaning the storage tank. When no wastewater is being discharged into the purification equipment, the cleaning device can remove the accumulated sludge in the storage tank, preventing the sludge from becoming smelly.

[0027] Optionally, a rinsing device is provided between the disinfection tank and the SSgo solid-liquid rapid separation device. The rinsing device is connected to both the disinfection tank and the SSgo solid-liquid rapid separation device and can transport water from the disinfection tank to the SSgo solid-liquid rapid separation device.

[0028] By adopting the above technical solution, the backwashing device can introduce water from the disinfection tank into the SSgo solid-liquid rapid separation device, thereby rinsing the filter cloth inside the SSgo solid-liquid rapid separation device.

[0029] Secondly, the high-efficiency purification process for rainwater and sewage overflow provided in this application adopts the following technical solution:

[0030] A highly efficient wastewater purification process for rainwater and sewage overflow includes the following steps:

[0031] S1: Inlet: Wastewater is discharged into the regulating tank;

[0032] S11: Coarse filtration: Before the sewage is discharged into the storage tank, it is filtered through a coarse screen;

[0033] S12: Filter residue dewatering: The filtered contaminants are sent into the press for pressing;

[0034] S13: Filtrate return: The pressed filtrate is returned to the storage tank;

[0035] S2: Insoluble impurity removal: Removes water-insoluble impurities from wastewater;

[0036] S21: Solid-liquid separation: Wastewater is discharged into the SSgo rapid solid-liquid separation device for filtration;

[0037] S22: Impurity dehydration: The filtered impurities are discharged into a pressing and dehydrating device for pressing and dehydration;

[0038] S23: Wastewater return: The wastewater from the pressing process is returned to the regulating tank;

[0039] S3: Water storage: Store the water filtered by the SSgo solid-liquid rapid separation device;

[0040] S4: Dissolved impurity removal: Removes dissolved pollutants from wastewater;

[0041] S41: Chemical dosing: Adding flocculants and coagulants to wastewater;

[0042] S42: Separation: The wastewater after chemical dosing is discharged into a high-speed air flotation device to separate the wastewater from the sludge;

[0043] S43: Sludge dewatering: The separated sludge is discharged into the sludge dewatering device to dewater the sludge;

[0044] S44: Wastewater return: Wastewater generated by the sludge dewatering device is returned to the storage tank;

[0045] S5: Disinfection and sterilization: The water separated by the high-speed air flotation device is discharged into the disinfection tank and disinfectant is added;

[0046] S51: Rinsing and reflux: Connect the water in the disinfection tank to the SSgo solid-liquid rapid separation device to rinse the filter cloth in the SSgo solid-liquid rapid separation device;

[0047] S52: Flushing water return: Discharge the wastewater after rinsing the SSgo solid-liquid rapid separation device into the regulating tank;

[0048] S6: Discharge: Discharge the purified water to the designated location;

[0049] By adopting the above technical solutions, insoluble impurities, soluble impurities, and pathogens in wastewater can be removed sequentially, thereby improving the wastewater purification effect.

[0050] Optionally, after step S6, the following step is also included: S7: Equipment cleaning: When no more sewage is discharged into the purification equipment, the cleaning device is started to clean the storage tank.

[0051] By adopting the above technical solution, the regulating tank inside the purification equipment is cleaned after the rainy season ends to prevent the sludge accumulated in the regulating tank from smelling bad.

[0052] In summary, this application includes at least one of the following beneficial technical effects:

[0053] 1. By installing purification equipment, wastewater is purified, achieving a maximum COD removal rate of 85%, a maximum SS removal rate of 98%, a maximum TP removal rate of 98%, and a fecal coliform count of less than 10. 3 per L.

[0054] 2. The process is simple and efficient, with good treatment effect and short hydraulic residence time. For example, the hydraulic residence time of the SSgo solid-liquid rapid separation equipment is <5s, which is much lower than the existing pretreatment process; the hydraulic residence time of the high-speed air flotation equipment is <10min, while the hydraulic residence time of the existing air flotation equipment is 10~20min.

[0055] 3. When the high-speed air flotation equipment is running, cationic PAM reagent is added directly through the dosing mechanism. When used in conjunction with a high-speed mixer, the reagent utilization rate can be greatly improved, the reagent dosage can be reduced, and the treatment effect can be improved. The sludge produced by the high-speed air flotation equipment has a lower moisture content, around 95%. Since the cationic PAM reagent has already been added through the dosing mechanism, no additional reagents need to be added during sludge dewatering, thus reducing operating costs. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the overall structure of the purification device according to Embodiment 1 of this application.

[0057] Figure 2 This is a flowchart illustrating the wastewater purification process within the purification equipment of Embodiment 1 of this application.

[0058] Figure 3 This is a schematic diagram of the overall structure of the sedimentation tank and the bar filter tank in Embodiment 2 of this application.

[0059] Figure 4 This is a cross-sectional structural diagram of the sedimentation tank and the bar filter tank in Embodiment 2 of this application.

[0060] Figure 5 This is a flowchart illustrating the flow of sewage inside the regulating tank in Embodiment 2 of this application.

[0061] Figure 6 This is a cross-sectional structural diagram of the sedimentation tank and the bar filter tank of Embodiment 3 of this application.

[0062] Figure 7 This is a schematic diagram of the overall structure of the baffle in Embodiment 3 of this application.

[0063] Figure 8 This is a connection block diagram of the cleaning device in Embodiment 3 of this application.

[0064] Figure 9 This is a schematic diagram of the overall structure of the drug dispensing mechanism in Embodiment 4 of this application.

[0065] Figure 10 This is an exploded structural diagram of the dosing mechanism of Embodiment 4 of this application.

[0066] In the diagram, 1 is a regulating tank; 11 is a bar filter tank; 12 is a coarse bar; 13 is a sedimentation tank; 131 is a baffle; 1311 is a mounting hole; 1312 is a clearance groove; 132 is a first agitation mechanism; 1321 is an agitation shaft; 1322 is an agitation blade; 1323 is an agitation drive motor; 14 is a cyclone separator; 141 is a cyclone separator; and 142 is a second agitation mechanism.

[0067] 2. SSgo solid-liquid rapid separation device;

[0068] 3. Buffer pool;

[0069] 4. High-speed air flotation device; 41. High-speed mixer; 42. Dosing mechanism; 421. Support plate; 4211. Insertion hole; 422. Rotary disc; 4221. Dosing hole; 423. Dispensing plate; 4231. Dosing hole; 424. Rotary drive motor; 425. Diluent tank; 426. Diluent water pipe; 427. Stirring shaft; 428. Discharge pipe;

[0070] 5. Disinfection pool; 51. Disinfection facility;

[0071] 6. Press machine;

[0072] 7. Pressing and dehydration device;

[0073] 8. Sludge tank; 81. Mixer;

[0074] 9. Sludge dewatering device;

[0075] 100. Flushing device; 101. Flushing pipe;

[0076] 200. Automatic control system;

[0077] 300. Cleaning device; 301. First cleaning pipe; 302. Second cleaning pipe; 303. Third cleaning pipe; 304. Fourth cleaning pipe. Detailed Implementation

[0078] The following is in conjunction with the appendix Figure 1 -Appendix Figure 9 This application will be described in further detail below.

[0079] Example 1:

[0080] A high-efficiency sewage purification device for rainwater and sewage overflow, referring to Figure 1 The system includes a regulating tank 1, an SSgo solid-liquid rapid separation device 2, a buffer tank 3, a high-speed air flotation device 4, and a disinfection tank 5. The regulating tank 1, the SSgo solid-liquid rapid separation device 2, the buffer tank 3, the high-speed air flotation device 4, and the disinfection tank 5 are interconnected in sequence, and the sewage enters the purification equipment from the regulating tank 1 and is discharged from the purification equipment from the disinfection tank 5, thereby realizing the sewage purification process.

[0081] Reference Figure 1 One side of the regulating tank 1 is connected to a bar screen 11. The bar screen 11 is set before the regulating tank 1 along the flow direction of sewage in the purification equipment. The bar screen 11 is equipped with a coarse bar 12, so that the sewage can be removed by interception of the coarse bar 12, such as floating garbage and other large pollutants in the sewage.

[0082] The bar screen 11 is connected to the inlet of the regulating tank 1. After passing through the coarse screen 12, the sewage automatically flows into the regulating tank 1. The sewage entering the regulating tank 1 allows for a short-term retention of the sewage and balances the water quality and quantity. To save space, the bar screen 11 can be omitted, and the coarse screen 12 can be installed inside the regulating tank 1, both of which are underground tanks.

[0083] A press 6 is installed at one end of a coarse screen 12, and the coarse screen 12 is connected to the feed inlet of the press 6. The pollutants filtered out by the coarse screen 12 automatically fall into the press 6, which automatically presses the pollutants, separating the solid impurities from the wastewater. The wastewater outlet of the press 6 is connected to a regulating tank 1, and the filtrate after pressing automatically flows back into the regulating tank 1, allowing the wastewater to be purified again through the purification equipment, thus achieving a closed-loop wastewater system and preventing wastewater from polluting the environment along with the pollutants. The pressed pollutants are then transported out of the purification equipment.

[0084] Reference Figure 1 The outlet of the regulating tank 1 is connected to the inlet of the SSgo solid-liquid rapid separation device 2. Under the action of the water pump, the sewage in the regulating tank 1 can flow into the SSgo solid-liquid rapid separation device 2. The SSgo solid-liquid rapid separation device 2 can filter out impurities such as slag, sand, and hair in the sewage.

[0085] The SSgo solid-liquid rapid separation device 2 uses a polymer filter cloth as the filter medium, with a pore size in the range of 50-500 μm. It operates in a high-speed elliptical rotation, with a surface hydraulic load of 5 m. 3 / m 2 •h~100m 3 / m 2 •h, hydraulic retention time <5s, single SSgo solid-liquid rapid separation device 2 has a small footprint, and multiple SSgo solid-liquid rapid separation devices 2 can be connected in parallel when the sewage flow rate is large to improve the filtration speed of sewage.

[0086] Reference Figure 1 The outlet of the SSgo solid-liquid rapid separation device 2 is connected to the inlet of the buffer tank 3. The buffer tank 3 is set on the ground, and the SSgo solid-liquid rapid separation device 2 is set on the buffer tank 3. Thus, the water filtered by the SSgo solid-liquid rapid separation device 2 can be automatically discharged into the buffer tank 3 under the action of gravity. The buffer tank 3 can store sewage, which is convenient for water to enter the high-speed air flotation device 4.

[0087] Reference Figure 1The SSgo solid-liquid rapid separation device 2 is equipped with a slag outlet, which is used to discharge the solid pollutants filtered out inside the SSgo solid-liquid rapid separation device 2. A pressing and dewatering device 7 is installed on one side of the SSgo solid-liquid rapid separation device 2. The SSgo solid-liquid rapid separation device 2 is connected to the pressing and dewatering device 7 through the slag outlet, and the wastewater outlet of the pressing and dewatering device 7 is connected to the regulating tank 1.

[0088] The pollutants filtered out in the SSgo solid-liquid rapid separation device 2 are discharged from the slag outlet into the pressing and dewatering device 7. The pressing and dewatering device 7 uses a screw press or a pneumatic press to press and dewater the pollutants, and discharges the dewatered wastewater back into the storage tank 1, allowing the wastewater to be purified again through the purification equipment, thus achieving a closed loop for wastewater and preventing wastewater from polluting the environment along with the pollutants. The pressed pollutants are then transported out of the purification equipment.

[0089] The bottom filter screen of the pressing and dewatering device 7 has a pore size of 50-500μm. Specifically, when the pore size of the bottom filter screen of the pressing and dewatering device 7 is 300μm, it can effectively intercept fine particles such as mud, sand, and hair separated by the SSgo solid-liquid rapid separation device 2. After pressing and dewatering, the moisture content can reach below 75%, thus facilitating off-site transportation and processing.

[0090] Reference Figure 1 The high-speed air flotation device 4 is equipped with a high-speed mixer 41, which is a three-phase vortex high-speed mixer. A dosing mechanism 42 and an air compressor are connected to one side of the high-speed mixer 41. The outlet of the buffer tank 3 is connected to the high-speed mixer 41. Under the action of a high-pressure water pump, the sewage in the buffer tank 3 enters the high-speed mixer 41. Simultaneously, the air compressor supplies compressed air to the high-speed mixer 41, and the dosing mechanism 42 adds PAC liquid reagent and cationic PAM liquid reagent to the high-speed mixer 41. This allows the sewage, compressed air, PAC liquid reagent, and cationic PAM liquid reagent to mix rapidly and react quickly in the high-speed mixer 41. The flocculants and coagulants then flocculate the pollutants in the sewage, thereby reducing the chemical oxygen demand (COD), total phosphorus (TP), and activated sludge concentration (SS) in the sewage. The high-speed air flotation device 4 separates the reacted sewage from the sludge, achieving sewage purification.

[0091] The high-speed mixer 41 is installed on both sides of the high-speed flotation device 4, completely replacing the coagulation and flocculation reaction zones of common flotation equipment, greatly saving space. The high-speed flotation device 4, in conjunction with the high-speed mixer 41, can directly add cationic PAM reagent, which not only improves the treatment effect, but also eliminates the need for secondary reagent addition during the dewatering and filter pressing of the sludge produced subsequently.

[0092] The high-speed air flotation device 4 is equipped with a sludge discharge port, which is used to discharge the sludge separated by the high-speed air flotation device 4. A sludge tank 8 is provided on one side of the high-speed air flotation device 4. The high-speed air flotation device 4 is connected to the sludge tank 8 through the sludge discharge port. Under the action of the sludge discharge pump, the sludge of the high-speed air flotation device 4 can be automatically discharged into the sludge tank 8 to achieve sludge collection.

[0093] A mixer 81 is installed inside the sludge tank 8, vertically positioned at the top. When the mixer 81 is turned on, it agitates the sludge within the tank, ensuring uniform distribution and preventing sedimentation. A sludge dewatering device 9 is installed on one side of the sludge tank 8, connected to it. Under the action of a sludge pump, the sludge from the tank 8 enters the dewatering device 9, which separates the wastewater from the sludge. The dewatering device 9 is also connected to a regulating tank 1, allowing the separated wastewater to re-enter the regulating tank 1 for further purification. The separated sludge is then transported out of the purification equipment.

[0094] The sludge dewatering device 9 adopts a screw press sludge dewatering machine, which is installed on the ground, occupies little space, can operate continuously, and has high filter pressing efficiency.

[0095] Reference Figure 1 The outlet of the high-speed air flotation device 4 is connected to the inlet of the disinfection tank 5. The disinfection tank 5 is located underground, while the high-speed air flotation device 4 is located above the disinfection tank 5, so that the wastewater purified in the high-speed air flotation device 4 can be automatically discharged into the disinfection tank 5.

[0096] The disinfection pool 5 is equipped with a disinfection mechanism 51, which is connected to the disinfection pool 5. The disinfection mechanism 51 adds liquid sodium hypochlorite disinfectant to the disinfection pool 5. The disinfectant can kill pathogens in the water and remove a small amount of COD and ammonia nitrogen.

[0097] The inlet of the disinfection tank 5 is vertically located at the top, ensuring that the pipes of the high-speed air flotation device 4 and the disinfection tank 5 can be installed vertically, saving space and shortening the pipes; the outlet of the disinfection tank 5 is located on the side wall of the disinfection tank 5, so that the disinfected water can be discharged outward.

[0098] Reference Figure 1A rinsing device 100 is installed between the disinfection tank 5 and the SSgo solid-liquid rapid separation device 2. The rinsing device 100 includes a rinsing pipe 101, with both ends connected to the rinsing water inlets of the disinfection tank 5 and the SSgo solid-liquid rapid separation device 2, respectively. Under the action of the rinsing water pump, the clean water in the disinfection tank 5 can be discharged into the SSgo solid-liquid rapid separation device 2 to clean the filter cloth and other components in the SSgo solid-liquid rapid separation device 2. The rinsing device 100 also includes a backflow pipe, with both ends connected to the SSgo solid-liquid rapid separation device 2 and the regulating tank 1, respectively, so that the rinsed wastewater can be discharged into the regulating tank 1 through the backflow pipe.

[0099] Reference Figure 1 The purification equipment also includes an automatic control system 200. Several liquid level sensors and several wastewater detection sensors are installed in the regulating tank 1, buffer tank 3, SSgo solid-liquid rapid separation device 2, sludge tank 8, and disinfection tank 5. The coarse screen 12, SSgo solid-liquid rapid separation device 2, high-speed air flotation device 4, dosing mechanism 42, disinfection mechanism 51, air compressor, and all pumps and pipeline valve groups are electrically connected to the automatic control system 200, so that the automatic control system 200 can detect the wastewater in the purification equipment and realize the fully automatic operation of the purification equipment.

[0100] The implementation principle of this application embodiment is as follows: when the rainy season arrives, the overflow sewage will automatically flow into the purification equipment through the overflow well.

[0101] In the purification equipment, wastewater passes through a coarse screen 12 to remove larger pollutants such as floating debris, and then flows by gravity into a regulating tank 1. It then enters an SSgo solid-liquid rapid separation device 2, where most of the garbage, slag, sand, hair, and other fine pollutants are separated. The wastewater then enters a buffer tank 3, and is subsequently fed into a high-speed air flotation device 4. PAC liquid reagent, cationic PAM liquid reagent, and compressed air are added simultaneously with the incoming water. The water is rapidly mixed and reacted by a high-speed mixer 41, removing most suspended solids, total phosphorus, and non-dissolved COD. The effluent from the high-speed air flotation device 4 then flows into a disinfection tank 5, where disinfectant is added to kill pathogens carried in the water. Simultaneously, a small amount of COD and ammonia nitrogen are removed. The purified water is then discharged to a designated location.

[0102] After passing through the above purification equipment, the COD removal rate of the effluent can reach up to 85%, the SS removal rate can reach up to 98%, the TP removal rate can reach up to 98%, and the fecal coliform count is less than 103 CFU / L.

[0103] A high-efficiency wastewater purification process for rainwater and sewage overflow, referring to Figure 2 This includes the following steps:

[0104] S1: Inlet: Wastewater is discharged into the regulating tank 1 to store the wastewater.

[0105] S11: Coarse filtration: Before the sewage enters the regulating tank 1, the sewage is filtered through the bar screen 11 to remove larger pollutants such as floating garbage.

[0106] S12: Dewatering of filter residue: The pollutants filtered out in S11 are sent into the press 6 to dewater them. Then the dewatered pollutants are transported out to prevent wastewater from leaking out with the pollutants.

[0107] S13: Filtrate Recirculation: The filtrate filtered in S12 is recirculated back into the regulating tank 1 to achieve the re-purification of wastewater.

[0108] S2: Removal of insoluble impurities: Remove small particulate impurities from the wastewater in the regulating tank 1.

[0109] S21: Solid-liquid separation: Wastewater is discharged from the regulating tank 1 into the SSgo solid-liquid rapid separation device 2, which filters out impurities such as slag, sand, and hair from the wastewater.

[0110] S22: Impurity dehydration: The impurities filtered out in S21 are discharged into the pressing and dehydration device 7 to dehydrate the impurities. Then, the dehydrated impurities are transported out to prevent wastewater from leaking out with the impurities.

[0111] S23: Wastewater Recirculation: The wastewater filtered in S22 is recirculated back into the regulating tank 1 to achieve wastewater repurification.

[0112] S3: Water storage: Store and buffer the water filtered by the SSgo solid-liquid rapid separation device 2.

[0113] S4: Dissolved impurity removal: The wastewater is discharged from the SSgo solid-liquid rapid separation device 2 into the high-speed air flotation device 4 to remove dissolved pollutants.

[0114] S41: Chemical dosing: PAC liquid agent and cationic PAM liquid agent are added to the wastewater to cause the insoluble impurities in the wastewater to react with the agents, resulting in the flocculation of the impurities in the wastewater.

[0115] S42: Separation: The flocculated wastewater is discharged into the high-speed air flotation device 4 to separate the wastewater from the sludge.

[0116] S43: Sludge dewatering: The sludge separated in S42 is discharged into the sludge dewatering device 9 to dewater the sludge, and then the dewatered sludge is transported off-site to prevent sewage from leaking out with impurities.

[0117] S44: Wastewater Recirculation: The wastewater filtered in S43 is recirculated back into the regulating tank 1 to achieve wastewater repurification.

[0118] S5: Disinfection and sterilization: The separated wastewater is discharged into disinfection tank 5, and chlorine-containing disinfectant is added to remove pathogens from the wastewater.

[0119] S51: Rinsing and reflux: Connect the water in the disinfection tank 5 to the SSgo solid-liquid rapid separation device 2 to rinse the filter cloth in the SSgo solid-liquid rapid separation device 2.

[0120] S52: Flushing water return: The wastewater after rinsing the SSgo solid-liquid rapid separation device 2 is discharged into the regulating tank 1 to flush and purify the wastewater.

[0121] S6: Discharge: Discharge the purified water to the designated location.

[0122] The implementation principle of this application embodiment is as follows: by sequentially removing insoluble impurities, soluble impurities, and pathogens from sewage, the purification effect of sewage can be improved.

[0123] Example 2:

[0124] A high-efficiency sewage purification device for rainwater and sewage overflow, referring to Figure 1 and Figure 3 The difference between this embodiment and embodiment 1 is that the regulating tank 1 includes a sedimentation tank 13 and a cyclone separator 14. The inlet of the sedimentation tank 13 is connected to the outlet of the bar filter tank 11, and the outlet of the sedimentation tank 13 is connected to the cyclone separator 14, so that the sewage can pass through the sedimentation tank 13 for sedimentation and pass through the cyclone separator 14 to separate impurities.

[0125] Reference Figure 3 A baffle 131 is installed inside the sedimentation tank 13. The baffle 131 is positioned between the inlet and outlet of the sedimentation tank 13, separating them. The top of the baffle 131 is connected to the top wall of the sedimentation tank 13, and the lower end of the baffle 131 is spaced apart from the bottom of the sedimentation tank 13. Therefore, wastewater discharged into the sedimentation tank 13 must undergo sedimentation on the side of the baffle 131 facing the inlet before being discharged from the outlet of the sedimentation tank 13. This ensures that the wastewater undergoes sedimentation, reducing the pollutant content in the wastewater.

[0126] Reference Figure 3 and Figure 4The cyclone separator 141 is installed in the cyclone separator 141. A booster pump is installed on the inlet side of the cyclone separator 141 and is connected to the outlet of the sedimentation tank 13. The outlet at the top of the cyclone separator 141 is connected to the inlet of the SSgo solid-liquid rapid separation device 2. Thus, the cyclone separator 141 can further separate solid impurities in the sewage.

[0127] The implementation principle of this application embodiment is as follows: the SSgo solid-liquid rapid separation device 2 can replace fine screens, various grit chambers (aerated grit chambers, cyclone grit chambers), membrane screens, etc., for filtering sewage. However, since the SSgo solid-liquid rapid separation device 2 is equipped with filter cloth and other filtration barriers, in some places with high impurity content, using only the SSgo solid-liquid rapid separation device 2 will place a heavy burden on the internal filter cloth and the rinsing device 100.

[0128] Based on the above problems, in order to reduce the burden on the internal filter cloth and backwashing device 100 of the SSSgo solid-liquid rapid separation device 2, a grid filter tank 11, a sedimentation tank 13 and a cyclone separator 14 are set in the regulating tank 1 before the SSSgo solid-liquid rapid separation device 2 to pre-filter most of the large particulate impurities and a small part of the small particulate impurities in the sewage. The SSSgo solid-liquid rapid separation device 2 can filter most of the small particulate impurities, thereby ensuring the filtration accuracy of impurities in the sewage.

[0129] A high-efficiency wastewater purification process for rainwater and sewage overflow, referring to Figure 4 Step S1 also includes the following steps:

[0130] S14: Sedimentation and filtration: The coarsely filtered wastewater is introduced into sedimentation tank 13 for sedimentation, and some insoluble impurities are removed by sedimentation.

[0131] S15: Cyclone Separation: Wastewater that has been filtered through sedimentation is introduced into the cyclone separator 14, and some insoluble impurities are removed by the cyclone separator 141.

[0132] The implementation principle of this application embodiment is as follows: sedimentation and cyclone separation are set in front of the SSSgo solid-liquid rapid separation device 2 to filter out most of the large particulate impurities and a small part of the small particulate impurities, thereby reducing the burden on the filter cloth and backwashing device 100 inside the SSSgo solid-liquid rapid separation device 2.

[0133] Example 3:

[0134] A high-efficiency sewage purification device for rainwater and sewage overflow, referring to Figure 6 and Figure 7 The difference between this embodiment and Embodiment 2 is that:

[0135] A first agitation mechanism 132 is provided inside the sedimentation tank 13. The first agitation mechanism 132 includes an agitation shaft 1321. A mounting hole 1311 is vertically through-cut on a baffle 131. Several clearance grooves 1312 are horizontally through-cut on both sides of the baffle 131. The agitation shaft 1321 is vertically inserted into the mounting hole 1311. Several agitation blades 1322 are axially spaced on the agitation shaft 1321. The agitation blades 1322 are arranged one-to-one with the clearance grooves 1312. 1322 is slidably connected to the side wall of the clearance groove 1312. An agitation drive motor 1323 is provided at one end of the agitation shaft 1321. The agitation drive motor 1323 drives the agitation blades 1322 to rotate the sedimentation tank 13, thereby agitating the sludge deposited at the bottom of the sedimentation tank 13. At the same time, when the agitation drive motor 1323 stops driving, the agitation blades 1322 can close the clearance groove 1312 on the baffle 131, so that the baffle 131 can fulfill its function.

[0136] Reference Figure 8 The inlet of the sedimentation tank 13 is connected to a cleaning device 300. The cleaning device 300 includes a first cleaning pipe 301, a second cleaning pipe 302, a third cleaning pipe 303, and a fourth cleaning pipe 304. The first cleaning pipe 301 connects the sedimentation tank 13 and the disinfection tank 5. The cleaning device 300 can introduce the clean water in the disinfection tank 5 into the sedimentation tank 13, so that the sedimentation tank 13 can be cleaned in advance when the sewage in the purification equipment stops being discharged, thus preventing the sludge in the sedimentation tank 13 from accumulating and smelling bad.

[0137] The sedimentation tank 13 has a sedimentation sludge discharge port at the bottom, which is used to discharge the sludge from the sedimentation tank 13. The sedimentation sludge discharge port is connected to the pressing and dewatering device 7, so that the wastewater from cleaning the sedimentation tank 13 can be discharged into the pressing and dewatering device 7. The pressing and dewatering device 7 separates the sludge from the wastewater. The wastewater is discharged into the municipal sewer system, and the sludge is transported away, thus achieving the removal of sludge from the sedimentation tank 13.

[0138] Reference Figure 8 The second cleaning pipe 302 connects the cyclone separator 14 and the disinfection tank 5. A second agitation mechanism 142 is installed at the bottom of the cyclone separator 14. The second agitation mechanism 142 has the same structure as the first agitation mechanism 132. The second agitation mechanism 142 is horizontally positioned at the bottom of the cyclone separator 141, thereby uniformly mixing the sludge and wastewater in the cyclone separator 14, facilitating sludge discharge. The cyclone separator 14 is also interconnected with the cleaning device 300 and the pressing and dewatering device 7 for cleaning the cyclone separator 14.

[0139] Reference Figure 8The third cleaning pipe 303 connects the buffer tank 3 and the disinfection tank 5, and the structure of the buffer tank 3 is the same as that of the sedimentation tank 13, so the buffer tank 3 can also be cleaned.

[0140] Reference Figure 8 The fourth cleaning pipe 304 connects the sludge tank 8 and the disinfection tank 5. Since the sludge tank 8 and the sludge dewatering device 9 are interconnected, the sludge tank 8 can be cleaned.

[0141] The implementation principle of this application embodiment is as follows: After the flood season ends, the purification equipment will no longer be used. At this time, the cleaning device 300 cleans the storage tank 1, sludge tank 8 and buffer tank 3, and the sludge will be dewatered and pressed so that the sludge can be transported out. The pressed wastewater will be discharged into the urban sewer system to prevent the sludge from accumulating in the purification equipment and causing it to smell.

[0142] A high-efficiency wastewater purification process for rainwater and sewage overflow, referring to Figure 8 The following steps are included after step S6:

[0143] S7: Equipment Cleaning: When no more sewage is discharged into the purification equipment, the sewage in the disinfection tank 5 is discharged into the storage tank 1, buffer tank 3 and sludge tank 8 to flush the storage tank 1, buffer tank 3 and sludge tank 8 and remove the sludge accumulated in the storage tank 1, buffer tank 3 and sludge tank 8.

[0144] The implementation principle of this application embodiment is as follows: after the rainy season ends, the regulating tank 1, buffer tank 3 and sludge tank 8 in the purification equipment are cleaned to prevent the sludge accumulated in the regulating tank 1, buffer tank 3 and sludge tank 8 from smelling bad.

[0145] Example 4:

[0146] A high-efficiency sewage purification device for rainwater and sewage overflow, referring to Figure 9 and Figure 10The difference between this embodiment and Embodiment 2 is that the dosing mechanism 42 includes a support plate 421, a rotating plate 422, and a dispensing plate 423. The support plate 421, rotating plate 422, and dispensing plate 423 are arranged coaxially and connected to each other in sequence along the vertical direction. Two insertion holes 4211 are opened through the support plate 421 along the vertical direction, so that the medicine bottles containing PAM powder and PAC powder are inserted upside down into the corresponding insertion holes 4211. The rotating plate 421... Two medicine placement holes 4221 are vertically oriented through the rotating disk 422. A rotary drive motor 424 is installed on the rotating disk 422 to drive the rotating disk 422 to rotate. During the rotation of the rotating disk 422, the medicine placement holes 4221 are vertically connected to the corresponding insertion holes 4211, so that when the medicine placement holes 4221 are connected to the corresponding insertion holes 4211, the corresponding medicine powder will fall into the medicine placement holes 4221 and fill the medicine placement holes 4221, realizing quantitative medicine dispensing. A medicine dispensing disk 423 has a medicine dispensing hole 4231 vertically oriented through it. During the rotation of the rotating disk 422, the two medicine placement holes 4221 are vertically connected to the medicine dispensing hole 4231, so that the medicine powder in the medicine placement holes 4221 can slide out of the medicine dispensing hole 4231.

[0147] A dilution tank 425 is located below the dispensing tray 423. The upper end of the dilution tank 425 is penetrated through it, and the dispensing tray 423 is inserted into the dilution tank 425, allowing the powdered medicine in the dispensing hole 4221 to be added into the dilution tank 425. A dilution water pipe 426 is connected to one side of the dilution tank 425. A flow meter and a control valve are connected to the dilution water pipe 426, which can monitor the flow rate of the water in the dilution water pipe 426 in real time and control the opening and closing of the pipe. The introduction of water into the dilution tank 425 through the dilution water pipe 426 dissolves the powdered medicine, converting it into a liquid. A stirring shaft 427 is installed inside the dilution tank 425, ensuring that the powdered medicine is fully dissolved and mixed through stirring.

[0148] The lower end of the reagent tank is equipped with a discharge pipe 428. The two ends of the discharge pipe 428 are connected to the dilution tank 425 and the high-speed mixer 41 in the high-speed air flotation device 4, respectively. The discharge pipe 428 is equipped with a flow meter and a control valve to control the amount of reagent added in real time.

[0149] The implementation principle of this application embodiment is as follows: The automatic control system 200 detects the content of pollutants in the wastewater in real time, and prepares the reagent according to the pollutant content. First, the reagent is converted into a solid, and then quantitatively added to the dilution tank 425 through the reagent dispensing device. Then, the reagent in the dilution tank 425 is diluted and mixed before being discharged into the wastewater. Since the prepared reagent concentration can be changed in real time according to the content of pollutants in the wastewater, and since the reagent is diluted with clean water, the volume of the reagent solution can be increased, thereby increasing the flow rate of the reagent solution discharged into the wastewater. This eliminates the need to use a high-precision flow meter to accurately control the content of the reagent solution discharged into the wastewater.

[0150] A high-efficiency wastewater purification process for rainwater and sewage overflow includes the following steps in step S41:

[0151] S411: Chemical preparation: Prepare the corresponding chemical powder according to the content of pollutants in the wastewater.

[0152] S412: Dilution: Add water to the powdered medicine to dissolve it, and at the same time dilute the liquid medicine.

[0153] The implementation principle of this application embodiment is as follows: the drug is prepared by mixing the drug powder and diluted with water, thereby enabling free control of the concentration of the liquid drug.

[0154] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rain and sewage overflow sewage high-efficiency purification device, characterized in that, The utility model relates to a sewage treatment device, including the storage tank (1), SSgo solid liquid quick separation device (2), high speed gas float device (4), disinfection tank (5), dosing mechanism (42), disinfection mechanism (51), press dewatering device (7), sludge dewatering device (9), the storage tank (1), SSgo solid liquid quick separation device (2), high speed gas float device (4) and disinfection tank (5) are communicated sequentially in order, the dosing mechanism (42) with high speed gas float device (4) intercommunication and the dosing mechanism (42) are equipped with coagulant and flocculating agent, disinfection mechanism (51) with disinfection tank (5) intercommunication and disinfection mechanism (51) are equipped with disinfectant, press dewatering device (7) with SSgo solid liquid quick separation device (2) communication, sludge dewatering device (9) with high speed gas float device (4) intercommunication, sludge dewatering device (9) with press dewatering device (7) sewage outlet all with the storage tank (1) intercommunication, The storage tank (1) comprises a sedimentation tank (13), the sedimentation tank (13) is provided with a baffle (131), the baffle (131) is arranged between the water inlet and the water outlet of the sedimentation tank (13), and the baffle (131) separates the water inlet and the water outlet of the sedimentation tank (13). The sedimentation tank (13) is provided with a first stirring mechanism (132), the first stirring mechanism (132) comprises a stirring shaft (1321), the baffle (131) is provided with a mounting hole (1311) penetrating in the vertical direction, a plurality of accommodation grooves (1312) penetrating the two sides of the baffle (131) in the horizontal direction, the stirring shaft (1321) is inserted into the mounting hole (1311) in the vertical direction, a plurality of stirring blades (1322) are arranged on the stirring shaft (1321) in the axial direction, the stirring blades (1322) are arranged one by one corresponding to the accommodation grooves (1312), and the stirring blades (1322) are slidably connected with the side walls of the accommodation grooves (1312), and a stirring drive motor (1323) is arranged at one end of the stirring shaft (1321); the stirring blades (1322) can be rotated under the drive of the stirring drive motor (1323), and the sludge deposited at the bottom of the sedimentation tank (13) is stirred. When the stirring drive motor (1323) stops driving, the stirring blades (1322) can close the accommodation grooves (1312) on the baffle (131). The storage tank (1) further comprises a cyclone separation tank (14), the cyclone separation tank (14) is provided with a cyclone separator (141), a booster pump is arranged on one side of the water inlet of the cyclone separator (141), and the water outlet of the sedimentation tank (13) is connected with the water inlet of the cyclone separator (141), and the water outlet at the top of the cyclone separator (141) is connected with the water inlet of the SSgo solid liquid quick separation device (2). The second stirring mechanism (142) is arranged at the bottom of the cyclone separator (141) in the horizontal direction. The cleaning device (300) is arranged on the disinfection tank (5) and communicates with the disinfection tank (5), the sedimentation tank (13) and the cyclone separation tank (14). The sedimentation tank (13) and the cyclone separation tank (14) communicate with the squeezing dehydration device (7).

2. The rain and sewage overflow sewage high-efficiency purification equipment according to claim 1, characterized in that, The grid filter tank (11) is arranged on one side of the storage tank (1) and is arranged before the storage tank (1) in the flow direction of the sewage in the purification equipment.

3. The rain and sewage overflow sewage high-efficiency purification equipment according to claim 2, characterized in that, The grid filter tank (11) communicates with the storage tank (1), and the coarse grid (12) is provided with a squeezing machine (6) at one end in the conveying direction of the coarse grid (12).

4. The rain and sewage overflow sewage high-efficiency purification equipment according to claim 1, characterized in that, The high-speed mixer (41) is arranged on the high-speed air floatation device (4) and communicates with the dosing mechanism (42), and the high-speed mixer (41) further communicates with an air compressor.

5. The rain and sewage overflow sewage high-efficiency purification equipment according to claim 1, characterized in that, The sludge tank (8) is arranged between the sludge dehydration device (9) and the high-speed air floatation device (4), and the sludge tank (8) communicates with the high-speed air floatation device (4) and the sludge dehydration device (9) respectively.

6. The rain and sewage overflow sewage high-efficiency purification equipment according to claim 1, characterized in that, The flushing device (100) is arranged between the disinfection tank (5) and the SSgo solid-liquid rapid separation device (2), and the flushing device (100) communicates with the disinfection tank (5) and the SSgo solid-liquid rapid separation device (2) respectively and can convey water in the disinfection tank (5) to the SSgo solid-liquid rapid separation device (2).

7. A rainwater and sewage overflow wastewater high-efficiency purification process using the rainwater and sewage overflow wastewater high-efficiency purification equipment according to any one of claims 1-6. The method comprises the following steps: S1： Water inlet: sewage is discharged into the storage tank (1); S11: coarse filtration: before the sewage is discharged into the storage tank (1), the sewage is filtered through the coarse grid (12); S12: filter residue dehydration: the filtered pollutants are sent into the squeezing machine (6) for squeezing; S13: filtrate backflow: the squeezed filtrate is backflowed into the storage tank (1); S2: insoluble impurity removal: insoluble impurities in the sewage are removed; S21: solid-liquid separation: the sewage is discharged into the SSgo solid-liquid rapid separation device (2) for filtration; S22: impurity dehydration: the filtered impurities are discharged into the squeezing dehydration device (7) for squeezing dehydration; S23: sewage backflow: the squeezed sewage is backflowed into the storage tank (1); S3: water storage: the water filtered by the SSgo solid-liquid rapid separation device (2) is stored; S4: dissolved impurity removal: dissolved pollutants in the sewage are removed; S41: adding chemicals: adding flocculants and coagulants into the sewage; S42: separation: discharging the sewage after adding chemicals into the high-speed air flotation device (4) to separate the sewage and sludge from each other; S43: sludge dewatering: discharging the separated sludge into the sludge dewatering device (9) to dewater the sludge; S44: sewage backflow: backflowing the sewage generated by the sludge dewatering device (9) into the surge tank (1); S5: disinfection: discharging the water separated by the high-speed air flotation device (4) into the disinfection tank (5) and adding disinfectants; S51: backflow for flushing: connecting the water in the disinfection tank (5) to the SSgo solid-liquid rapid separation device (2) to flush the filter cloth in the SSgo solid-liquid rapid separation device (2); S52: backflow of flushing water: discharging the sewage after flushing the SSgo solid-liquid rapid separation device (2) into the surge tank (1); S6: discharge: discharging the purified water to a designated position.

8. The rainwater and sewage overflow wastewater efficient purification process according to claim 7, characterized in that, After step S6, it further includes: S7: equipment cleaning: when no sewage is discharged into the purification equipment, starting the cleaning device (300) to clean the surge tank (1).

Images