A high-efficiency wastewater purification device
By combining a purification tank, a uniform agitation system, and a clean air circulation mechanism, the problem of low purification efficiency of overflow sewage from combined sewer systems is solved, achieving efficient purification and ecological environmental protection.
Patent Information
- Application Number
- CN202510568741.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2045-04-30
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Figure CN120398224B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of wastewater purification technology, specifically relating to a high-efficiency purification device for overflow wastewater. Background Technology
[0002] Sewage overflow typically refers to the phenomenon in urban drainage systems where sewage exceeds the system's carrying capacity due to various reasons. Urban drainage systems are combined sewer systems. On sunny days, the sewage flow in the pipes is relatively small and can be transported downstream to sewage treatment plants for treatment through interceptor pipes. However, on rainy days, the flow exceeds the system's design capacity, resulting in overflow. This overflow carries away pollutants that have accumulated in the pipe system during sunny days, allowing them to flow directly into surrounding water bodies without treatment and causing pollution.
[0003] Therefore, the pollutants discharged into water bodies by combined sewer overflows have seriously threatened the aquatic ecosystem, significantly impacting the restoration of water body functions and the regulation of ecological balance. Currently, wastewater purification typically involves adding flocculants to aggregate impurities and harmful substances, which are then filtered and separated through sedimentation. However, this method is time-consuming, making the equipment unusable during rainy weather and causing inconvenience to users.
[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention
[0005] The purpose of this invention is to provide a high-efficiency purification device for overflow sewage, which can solve the problem of slow purification and separation efficiency of overflow sewage in combined sewer systems in the prior art.
[0006] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution:
[0007] A high-efficiency wastewater purification device includes: a purification tank, a gas mixing mechanism, a flocculation removal mechanism, and a clean gas circulation mechanism;
[0008] The gas mixing mechanism is installed in the purification tank. The gas mixing mechanism includes a main rotating support column, on which multiple evenly distributed support blocks are fixed. Each of the multiple support blocks is fixedly connected to a support frame cover. A rotating shaft is inserted into the support frame cover. A support sleeve is installed on the rotating shaft. Multiple evenly distributed mixing blades are fixed on the support sleeve.
[0009] The lint removal mechanism is installed on the main rotating support column. The lint removal mechanism includes a lint collection frame, a fixed column is inserted into the lint collection frame, one end of the fixed column is fixedly connected to the main rotating support column, and a collection net frame is engaged on the lint collection frame.
[0010] The air purification circulation mechanism is installed outside the purification tank. The air purification circulation mechanism is used to adsorb the odor emitted by the sewage in the purification tank and also has the function of introducing gas into the purification tank.
[0011] The air purification circulation mechanism includes multiple air-absorbing floc collection frames, which are all fixed to the top of the purification tank. Multiple air-absorbing holes are drilled in the air-absorbing floc collection frames.
[0012] In one or more embodiments of the present invention, a drain pipe is fixedly connected to the bottom of the purification tank for discharging the purified wastewater to the outside, thereby preventing wastewater from accumulating in the purification tank. A threaded plug is threadedly connected to one end of the drain pipe near the purification tank to block one end of the drain pipe, so that the wastewater in the purification tank will not leak during the purification process, thereby improving the purification effect of the wastewater and facilitating disassembly and installation by the staff.
[0013] In one or more embodiments of the present invention, a support ring is fixed on the inner wall of the purification tank to support and fix multiple driven racks, preventing the multiple driven racks from shaking and falling off. Multiple evenly distributed driven racks are installed on the support ring for meshing with the drive gear, so that when the rotating shaft drives the drive gear to rotate around the main rotating support column, the rotating shaft will also rotate on its own axis. In turn, the rotating shaft drives the support sleeve and the stirring blade to rotate, thereby achieving the effect of stirring sewage and diffusing gas, and improving the contact effect between gas and flocs.
[0014] In one or more embodiments of the present invention, a connecting rod is fixedly connected to the top of the main rotating support column for connecting the drive motor and the main rotating support column, so that the start of the drive motor can drive the main rotating support column to rotate, thereby playing a transmission role. The end of the connecting rod away from the main rotating support column is equipped with a drive motor for driving the main rotating support column to rotate, thereby providing rotational power for mixing sewage and collecting flocs.
[0015] A fixing collar is fixedly fitted on the drive motor to fix the drive motor, prevent the drive motor from shaking or tilting, and improve the stability of the device. Multiple support plates are fixedly connected between the fixing collar and the purification tank to provide conditions for fixing the drive motor.
[0016] In one or more embodiments of the present invention, a fixed bottom frame is fixed to the bottom of the purification tank, and a first sealed bearing is fixedly connected between the main rotating support column and the fixed bottom frame to fix the main rotating support column, so that the main rotating support column will not tilt or sway, thereby improving the stability of the device. Moreover, by setting the first sealed bearing, the main rotating support column can rotate freely.
[0017] In one or more embodiments of the present invention, a second sealed bearing is fixedly connected between the two ends of the rotating shaft and the support frame cover to fix the rotating shaft so that the rotating shaft will not wobble or tilt, thereby stably driving the drive gear to rotate and move, and ensuring that the rotation of the rotating shaft is not affected.
[0018] A drive gear that meshes with the driven rack is installed on the end of the rotating shaft away from the main rotating support column. When the rotating shaft drives the drive gear to rotate and move, the meshing between the drive gear and the driven rack allows the drive gear to drive the rotating shaft to rotate, thereby driving the support sleeve and the stirring blade to rotate, achieving the effect of stirring the sewage.
[0019] In one or more embodiments of the present invention, a plurality of circulating control air pumps are installed on the outside of the purification tank. The circulating control air pumps are fixedly connected to an air intake pipe and an air delivery pipe. The end of the air intake pipe away from the circulating control air pump is connected to an air intake floc collection frame. A fixing bolt is fitted on the circulating control air pump and fixed to the outer wall of the purification tank. By starting the circulating control air pump, the air intake holes can generate suction, so that the odor and gas generated by the sewage in the purification tank can be sucked away and then transported to the clean air box through the air delivery pipe, thereby facilitating the circulation of gas.
[0020] In one or more embodiments of the present invention, a clean air box is provided on the outside of the purification pool, and the end of the air supply pipe away from the circulation control air pump is connected to the clean air box to provide space for the purified gas. Multiple intelligent condensers are installed on the clean air box to control the temperature drop of multiple condensing pipes. Multiple condensing pipes are installed inside the clean air box, and the multiple condensing pipes are electrically connected to the intelligent condensers, so that when the gas comes into contact with the condensing pipes, some condensable gaseous pollutants can condense down with water vapor, achieving a preliminary purification effect.
[0021] In one or more embodiments of the present invention, a multi-layer filter is installed below the plurality of condensing pipes for further purification of the gas and adsorption of odors in the gas, thereby improving the purification effect of the gas.
[0022] In one or more embodiments of the present invention, a plurality of evenly distributed one-way control valves are installed between the purification tank and the clean air box for conveying the gas in the clean air box to the purification tank and preventing the sewage in the purification tank from flowing back into the clean air box.
[0023] Compared with the prior art, the present invention improves the purification efficiency and effect of overflow sewage through corresponding structural improvements, so that pollutants will not be directly discharged into water bodies during rainy weather, thereby improving the surrounding aquatic ecological environment. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a perspective view of an overflow sewage high-efficiency purification device according to an embodiment of the present invention;
[0026] Figure 2 for Figure 1 The structural diagram shown at point A in the middle;
[0027] Figure 3 This is a cross-sectional view of an overflow sewage high-efficiency purification device according to an embodiment of the present invention;
[0028] Figure 4 for Figure 3 The structural diagram shown at point B in the middle;
[0029] Figure 5 for Figure 3 The structural diagram shown at point C is as follows;
[0030] Figure 6 This is a partial structural schematic diagram of an overflow sewage high-efficiency purification device according to an embodiment of the present invention;
[0031] Figure 7 This is a partial structural schematic diagram of the gas mixing mechanism in one embodiment of the present invention;
[0032] Figure 8 This is a schematic diagram of the structure of the stirring blade in one embodiment of the present invention;
[0033] Figure 9 for Figure 8 The structural diagram shown at point D is shown in the middle.
[0034] Figure 10 This is a schematic diagram of the lint removal mechanism in one embodiment of the present invention.
[0035] Explanation of key figure labels:
[0036] 1-Purification tank, 101-Drainage pipe, 102-Threaded plug, 103-Support wall ring, 104-Driven rack, 2-Gas mixing mechanism, 201-Main rotating support column, 202-Support column block, 203-Support frame cover, 204-Rotating shaft, 205-Support sleeve, 206-Agitating blade, 207-Connecting rotating rod, 208-Drive motor, 209-Fixing collar, 210-Support connecting plate, 211-Fixing bottom frame, 212-First sealing bearing, 21 3-Second sealed bearing, 214-Drive gear, 3-Flocculant removal mechanism, 301-Floc collection frame, 302-Fixing column, 303-Collection mesh frame, 4-Clean air circulation mechanism, 401-Suction floc collection frame, 402-Suction hole, 403-Circulation control air pump, 404-Suction pipe, 405-Air delivery pipe, 406-Fixing bolt, 407-Clean air box, 408-Condensation pipe, 409-Multi-layer filter element, 410-One-way control valve, 411-Intelligent condenser. Detailed Implementation
[0037] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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 making creative efforts should fall within the scope of protection of the present invention.
[0038] like Figures 1-10 As shown, an embodiment of the present invention provides a high-efficiency wastewater purification device for overflow, comprising: a purification tank 1, a gas mixing mechanism 2, a flocculation removal mechanism 3, and a clean gas circulation mechanism 4.
[0039] like Figures 1-3 As shown, a drain pipe 101 is fixedly connected to the bottom of the purification tank 1 to discharge the purified sewage outward, preventing sewage from accumulating in the purification tank 1. A threaded plug 102 is threadedly connected to one end of the drain pipe 101 near the purification tank 1 to block one end of the drain pipe 101, so that the sewage in the purification tank 1 will not leak during the purification process, thereby improving the sewage purification effect and facilitating disassembly and installation by the staff.
[0040] like Figures 1-8As shown, a support ring 103 is fixed on the inner wall of the purification tank 1 to support and fix multiple driven racks 104, preventing them from shaking and falling off. Multiple evenly distributed driven racks 104 are installed on the support ring 103 to mesh with the drive gear 214. This causes the rotating shaft 204 to rotate around the main rotating support column 201, and also causes the rotating shaft 204 to rotate on its own axis. This, in turn, drives the support sleeve 205 and the stirring blade 206 to rotate, achieving the effect of stirring wastewater and diffusing gas, thus improving the contact effect between the gas and the flocs.
[0041] like Figures 1-7 As shown, the gas mixing mechanism 2 is installed inside the purification tank 1. The gas mixing mechanism 2 includes a main rotating support column 201, which supports multiple support blocks 202 and a support frame cover 203, serving as a support and transmission mechanism. Multiple evenly distributed support blocks 202 are fixed on the main rotating support column 201, which support the support frame cover 203 and drive the support frame cover 203 to rotate. Each of the multiple support blocks 202 is fixedly connected to a support frame cover 203, which supports the rotating shaft 204, the support sleeve 205, and the mixing blade 206.
[0042] like Figure 7 As shown, a rotating shaft 204 is inserted inside the support frame cover 203 to support the drive gear 214, the support sleeve 205, and the stirring blades 206. It also drives the support sleeve 205 and the stirring blades 206 to rotate. The support sleeve 205 is installed on the rotating shaft 204, and multiple evenly distributed stirring blades 206 are fixed on the support sleeve 205. By driving the multiple stirring blades 206, the sewage is stirred, so that impurities and floating matter in the sewage can be quickly collected, thereby improving the purification effect and efficiency of the sewage.
[0043] like Figures 1-6 As shown, a connecting rod 207 is fixedly connected to the top of the main rotating support column 201. This rod connects the drive motor 208 and the main rotating support column 201, allowing the drive motor 208 to rotate the main rotating support column 201 upon startup, thus providing a transmission function. The drive motor 208 is installed at the end of the connecting rod 207 furthest from the main rotating support column 201, providing rotational power for stirring wastewater and collecting flocs.
[0044] like Figures 1-3 As shown, a fixing collar 209 is fixedly sleeved on the drive motor 208 to fix the drive motor 208, prevent the drive motor 208 from shaking or tilting, and improve the stability of the device. Multiple support plates 210 are fixedly connected between the fixing collar 209 and the purification tank 1 to provide conditions for fixing the drive motor 208.
[0045] like Figures 1-5 As shown, a fixed bottom frame 211 is fixed at the bottom of the purification tank 1 to fix the bottom end of the main rotating support column 201 and prevent it from tilting. A first sealed bearing 212 is fixedly connected between the main rotating support column 201 and the fixed bottom frame 211 to fix the main rotating support column 201, so that the main rotating support column 201 will not tilt or shake, thus improving the stability of the device. Moreover, by setting the first sealed bearing 212, the main rotating support column 201 can rotate freely.
[0046] The two ends of the rotating shaft 204 are fixedly connected to the support frame cover 203 with a second sealed bearing 213, which is used to fix the rotating shaft 204 so that the rotating shaft 204 will not wobble or tilt, thereby stably driving the drive gear 214 to rotate and move, and ensuring that the rotation of the rotating shaft 204 is not affected.
[0047] like Figures 1-8 As shown, a drive gear 214 that meshes with the driven rack 104 is installed on the end of the rotating shaft 204 away from the main rotating support column 201. When the rotating shaft 204 drives the drive gear 214 to rotate, the drive gear 214 can mesh with the driven rack 104, so that the drive gear 214 can drive the rotating shaft 204 to rotate, thereby driving the support sleeve 205 and the stirring blade 206 to rotate, so as to achieve the effect of stirring sewage.
[0048] like Figures 1-10 As shown, the flocculation removal mechanism 3 is installed on the main rotating support column 201. The flocculation removal mechanism 3 includes a floc collection frame 301. By controlling the height of the sewage in the purification tank 1 to just cover the lowest point of the floc collection frame 301, the floc collection frame 301 can collect the flocs floating on the surface of the sewage into the collection net frame 303 when rotating, thus achieving the removal effect. A fixed column rod 302 is inserted on the floc collection frame 301 to support the floc collection frame 301 and drive the floc collection frame 301 to rotate. One end of the fixed column rod 302 is fixedly connected to the main rotating support column 201.
[0049] Specifically, a collection mesh frame 303 is engaged with the floc collection frame 301. The collection mesh frame 303 is used to collect the air-floc complex, so that it will not be carried away when the sewage is discharged. Preferably, a height sensor is installed in the purification tank 1, so that when the sewage level in the purification tank 1 rises to the position that overflows the lowest point of the floc collection frame 301, the sewage delivery is stopped, thereby preventing the sewage level from being too high and affecting the collection of the air-floc complex.
[0050] like Figure 1As shown, the air circulation mechanism 4 is installed outside the purification tank 1. The air circulation mechanism 4 is used to adsorb odors emitted from the wastewater in the purification tank 1 and also to introduce gas into the purification tank 1. The air circulation mechanism 4 includes multiple air-absorbing floc collection frames 401, all fixed to the top of the purification tank 1. Multiple air-absorbing holes 402 are drilled in the air-absorbing floc collection frames 401. These holes allow the odors emitted from the wastewater in the purification tank 1 to be quickly absorbed, preventing them from dissipating and improving the working environment for staff while reducing pollution.
[0051] like Figures 1-4 As shown, multiple circulation control air pumps 403 are installed on the outside of the purification tank 1 to control the circulation of gas, quickly remove odors emitted from the wastewater in the purification tank 1, and provide power for supplying gas to the purification tank 1. The circulation control air pumps 403 are fixedly connected to a suction pipe 404 and a delivery pipe 405, both used for transporting gas. The end of the suction pipe 404 away from the circulation control air pump 403 is connected to the suction floc collection frame 401 to facilitate gas flow. A fixing bolt 406 is fitted onto the circulation control air pump 403 and fixed to the outer wall of the purification tank 1. Activating the circulation control air pump 403 generates suction through the suction holes 402, allowing the odors and gases from the wastewater in the purification tank 1 to be removed. The gases are then transported to the clean air box 407 through the delivery pipe 405, facilitating gas circulation.
[0052] like Figures 1-4 As shown, a clean air box 407 is installed on the outside of the purification tank 1. The end of the air supply pipe 405 away from the circulation control air pump 403 is connected to the clean air box 407 to provide space for the purified gas. Multiple intelligent condensers 411 are installed on the clean air box 407 to control the temperature drop of multiple condensing pipes 408. Preferably, the intelligent condensers 411 will not start when the ambient temperature is detected to be low, reducing energy waste. Multiple condensing pipes 408 are installed inside the clean air box 407, and all multiple condensing pipes 408 are electrically connected to the intelligent condensers 411, so that when the gas comes into contact with the condensing pipes 408, some condensable gaseous pollutants can condense along with water vapor, achieving a preliminary purification effect.
[0053] In addition, multiple layers of filters 409 are installed below the multiple condensate pipes 408 to further purify the gas and absorb odors, thereby improving the purification effect. Multiple evenly distributed one-way control valves 410 are installed between the purification tank 1 and the clean gas box 407 to transport the gas from the clean gas box 407 to the purification tank 1 and prevent wastewater from flowing back into the clean gas box 407.
[0054] In practical use, wastewater is added to the purification tank 1 through the upper box, and the height of the wastewater is controlled to be half above the floc collection frame 301. Then, the drive motor 208 is started, which drives the connecting rod 207 and the main rotating support column 201 to rotate. The main rotating support column 201 will simultaneously drive multiple support blocks 202 to rotate. The support blocks 202 will also drive the support frame cover 203, the support sleeve 205, and the stirring blade 206 to rotate. While the rotating shaft 204 is rotating, the drive gear 214 will mesh with the driven rack 104, which will cause the rotating shaft 204 to drive the support sleeve 205 and the stirring blade 206 to rotate. The stirring blade 206 can stir the wastewater in the purification tank 1. At this time, flocculant is added to the wastewater in the purification tank 1.
[0055] By agitating the impurities in the wastewater with the flocculant through the stirring blades 206, the aggregated particles gradually increase, achieving a purification effect. At the same time, the start of multiple circulation control air pumps 403 will cause the suction holes 402 on multiple air-suction floc collection frames 401 to generate suction, sucking away the odors and gases emitted by the wastewater, and then transporting them into the clean air box 407 through the air delivery pipe 405.
[0056] When the intelligent condenser 411 starts, it controls multiple condensation pipes 408 to lower the temperature. The gas delivered by the gas supply pipe 405 first comes into contact with the condensation pipes 408, causing some condensable gaseous pollutants to condense along with the water vapor, achieving a preliminary purification effect. Then, the gas is purified by adsorption through multi-layer filter elements 409, removing odors from the gas. Finally, it flows back into the purification tank 1 through a one-way control valve 410. When the gas enters the wastewater, it not only cools the wastewater, but also, because the flocs have a large specific surface area and various active sites on their surface, gas molecules are adsorbed by these active sites when they approach the floc surface under Brownian motion, thus attaching to the flocs and forming a gas-floc complex. As a result, the flocs float to the water surface.
[0057] At this time, the main rotating support column 201 drives the fixed column rod 302, floc collection frame 301 and collection net frame 303 to rotate, which will cause the floc collection frame 301 to collect the air-floc complex floating on the sewage surface, achieving the cleaning effect. Finally, by rotating and removing the threaded plug 102, the purified sewage can be discharged from the drain pipe 101, thereby eliminating the time required for floc sedimentation and improving the sewage purification efficiency.
[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0059] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A high-efficiency wastewater purification device for overflow, characterized in that, include: A purification tank, wherein a supporting wall ring is fixed on the inner wall of the purification tank, and a plurality of evenly distributed driven racks are installed on the supporting wall ring; An air-uniform mixing mechanism is installed inside the purification tank. The air-uniform mixing mechanism includes a main rotating support column, on which multiple evenly distributed support blocks are fixed. Each of the multiple support blocks is fixedly connected to a support frame cover. A rotating shaft is inserted into the support frame cover. A support sleeve is installed on the rotating shaft. Multiple evenly distributed mixing blades are fixed on the support sleeve. Second sealed bearings are fixedly connected between the two ends of the rotating shaft and the support frame cover. A drive gear that meshes with a driven rack is installed on the end of the rotating shaft away from the main rotating support column. The lint removal mechanism is installed on the main rotating support column. The lint removal mechanism includes a lint collection frame, a fixed column is inserted into the lint collection frame, one end of the fixed column is fixedly connected to the main rotating support column, and a collection net frame is engaged on the lint collection frame. A clean air circulation mechanism is installed outside the purification tank. The clean air circulation mechanism is used to adsorb the odor emitted by the sewage in the purification tank and also has the function of introducing gas into the purification tank. The air purification circulation mechanism includes multiple air-absorbing floc collection frames, which are all fixed to the top of the purification tank. Multiple air-absorbing holes are drilled in the air-absorbing floc collection frames.
2. The overflow sewage high-efficiency purification device according to claim 1, characterized in that, A drain pipe is fixedly connected to the bottom of the purification tank, and a threaded plug is threadedly connected to one end of the drain pipe near the purification tank.
3. The overflow sewage high-efficiency purification device according to claim 1, characterized in that, A connecting rod is fixedly connected to the top of the main rotating support column. A drive motor is installed at the end of the connecting rod away from the main rotating support column. A fixing collar is fixedly sleeved on the drive motor. Multiple support plates are fixedly connected between the fixing collar and the purification tank.
4. The overflow sewage high-efficiency purification device according to claim 1, characterized in that, The bottom of the purification tank is fixed with a fixed bottom frame, and a first sealed bearing is fixedly connected between the main rotating support column and the fixed bottom frame.
5. The overflow sewage high-efficiency purification device according to claim 1, characterized in that, Multiple circulation control air pumps are installed on the outside of the purification tank. Each circulation control air pump is fixedly connected to an air intake pipe and an air delivery pipe. The end of the air intake pipe away from the circulation control air pump is connected to the air intake floc collection frame. A fixing bolt is fitted on the circulation control air pump and fixed to the outer wall of the purification tank.
6. The overflow sewage high-efficiency purification device according to claim 5, characterized in that, A clean air box is provided on the outside of the purification pool. The end of the air supply pipe away from the circulation control air pump is connected to the clean air box. Multiple intelligent condensers are installed on the clean air box. Multiple condensing pipes are installed inside the clean air box. All of the multiple condensing pipes are electrically connected to the intelligent condensers.
7. The overflow sewage high-efficiency purification device according to claim 6, characterized in that, Multiple layers of filters are installed below the various condensation pipes.
8. The overflow sewage high-efficiency purification device according to claim 6, characterized in that, Multiple evenly distributed one-way control valves are installed between the purification tank and the clean air box.
Citation Information
Patent Citations
Method for directly and deeply purifying high concentration organic wastewater
US20200055740A1
Screening apparatus with rotary pulsing member
US3400820A