Rectangular pool for domestic sewage treatment

Abstract

The utility model discloses a domestic sewage treatment rectangular pool, including septic tank body, the septic tank body is equipped with first processing area, second processing area and third processing area in proper order, and the upper portion of second processing area is fixed with first filter plate and second filter plate from top to bottom in proper order, and first filter plate and second filter plate all extend to the junction of second processing area and first processing area from the inner wall place of second processing area to third processing area with small angle downward inclination, then extend to the bottom of first processing area with large angle downward inclination, and the screen hole aperture of first filter plate is greater than the screen hole aperture of second filter plate. Two stage filtration of aperture from big to small has realized efficient grading solid -liquid separation, utilizes the composite inclination structure of unique small angle deceleration collection and large angle acceleration flush, and all retained solids are intelligently guided to the bottom of first processing area to carry out concentrated settlement and anaerobic digestion, and the removal efficiency of suspended matter is improved significantly, and the burden of subsequent processing area is reduced.

Description

Technical Field

[0001] This utility model relates to the field of water supply and drainage engineering technology, and in particular to a rectangular pool for treating domestic sewage. Background Technology

[0002] A septic tank is a device for treating and filtering feces. Its principle is that the solids decompose at the bottom of the tank, while the upper layer of water flows into the pipes to prevent blockage and gives the solids enough time to hydrolyze, thus anaerobically digesting the sludge.

[0003] Existing septic tanks are generally divided into three areas. The inlet pipe is located in the first area, and the outlet pipe is located in the third area. When sewage enters the first area, feces and other debris settle and form solids. After the wastewater rises to a certain height, it enters the second area through the outlet pipe. At this time, the wastewater may still carry some debris. Similarly, after sedimentation, the wastewater enters the third area and accumulates to a certain height before being discharged through the outlet pipe into the next system.

[0004] However, relying solely on the gravity of the debris to form solids and separate from the wastewater for filtration means that even after three sedimentation and filtration processes, some lighter debris, such as waste paper, will still flow with the wastewater. This debris can easily clog the sewage pipes, and if discharged through the drain pipes, it will also hinder the operation of the next system. Utility Model Content

[0005] The purpose of this invention is to provide a rectangular tank for treating domestic sewage in order to solve the above-mentioned problems.

[0006] The technical solution of this utility model is implemented as follows: This utility model provides a rectangular tank for treating domestic sewage, including a septic tank body. The septic tank body is provided with a first treatment zone, a second treatment zone, and a third treatment zone in sequence. A first filter plate and a second filter plate are fixedly installed above the second treatment zone from top to bottom. Both the first filter plate and the second filter plate extend downward at a small angle from the inner wall of the second treatment zone toward the third treatment zone to the junction of the second treatment zone and the first treatment zone, and then extend downward at a large angle to the bottom of the first treatment zone. The sieve aperture of the first filter plate is larger than that of the second filter plate. The water inlet pipe of the septic tank body is opened in the second treatment zone and is located above the highest point of the first filter plate.

[0007] In one embodiment, symmetrically distributed sliding rods are fixed above the first filter plate, and a support rod is slidably sleeved between the two sliding rods. Vertically downward telescopic rods are fixed on both sides of the support rod, and a scraper is fixed between the two telescopic rods. A strong spring is sleeved on the outside of the telescopic rod, with one end of the strong spring pressing against the support rod and the other end pressing against the scraper. A power assembly for controlling the forward and backward movement of the support rod is also provided in the second processing area.

[0008] In one embodiment, the scraper has a right-angled triangle cross-section, with one right-angled side attached to the inclined surface of the first filter plate, the inclined side being inclined toward the extending direction of the first filter plate.

[0009] In one embodiment, the scraper is fixed with a plurality of segmented pieces on one side perpendicular to the first filter plate.

[0010] In one embodiment, mounting members are fixed on both sides of the bottom of the segment, and multiple breakable parts are fixed on the mounting members.

[0011] In one embodiment, the mounting member extends outward in an expanding manner.

[0012] In one embodiment, the scraper has grooves on both sides of the dividing plate.

[0013] In one embodiment, the groove is inclined, and the inclination is consistent with that of the mounting component.

[0014] In one embodiment, the power assembly is a screw and slide rail assembly controlled by a motor. The motor is fixed on the inner wall of the second treatment zone away from the water inlet pipe, and the screw is assembled to the motor. The ball nut is fixedly connected to the support rod.

[0015] The advantages or beneficial effects of the above technical solutions include at least the following: Firstly, in this utility model, solid impurities in wastewater are intercepted step by step by setting a pore size gradient. The first filter plate with a large pore size intercepts coarse suspended solids such as fibers and hair, while the second filter plate with a small pore size further filters fine particulate impurities, which significantly improves the efficiency of suspended solids removal and reduces the burden of subsequent treatment.

[0016] Secondly, this utility model achieves intelligent anti-clogging and sludge diversion through scientific mechanical design. The small-angle inclined section of the filter plate slows down the sludge sliding speed, prolongs the contact time between sewage and solids, promotes initial separation, and avoids secondary particle agitation. The large-angle inclined section accelerates the sludge to slide directionally to the bottom of the first treatment zone for concentrated sedimentation, effectively avoiding the accumulation and clogging of filter residue on the surface of the filter plate, and significantly reducing the maintenance frequency. Attached Figure Description

[0017] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0018] Figure 1 This is a three-dimensional structural diagram of the exterior of the septic tank body in this utility model.

[0019] Figure 2 This is a three-dimensional structural diagram of the septic tank body after being cut apart in this utility model.

[0020] Figure 3 for Figure 2 Enlarged schematic diagram of the structure of section A in the middle.

[0021] Figure 4 for Figure 3 Enlarged schematic diagram of section B in the middle.

[0022] Figure 5 This is a three-dimensional structural diagram of the scraper exterior in this utility model.

[0023] Reference numerals in the attached drawings: 1. Septic tank body; 2. First treatment zone; 3. Second treatment zone; 4. Third treatment zone; 5. First filter plate; 6. Second filter plate; 7. Slide rod; 8. Support rod; 9. Telescopic rod; 10. Scraper; 11. Strong spring; 12. Dividing plate; 13. Mounting component; 14. Crushing component; 15. Groove; 16. Screw and slide rail assembly. Detailed Implementation

[0024] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0025] It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] It should be understood that the term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0027] It should be noted that the terms "a" and "a plurality of" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0028] The names of the messages or information exchanged between the multiple devices in this embodiment of the invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0029] Reference Figures 1-3 A rectangular sewage treatment tank includes a septic tank body 1. The septic tank body 1 contains a first treatment zone 2, a second treatment zone 3, and a third treatment zone 4, arranged sequentially. Above the second treatment zone 3, a first filter plate 5 and a second filter plate 6 are fixed sequentially from top to bottom. Both the first filter plate 5 and the second filter plate 6 extend downwards at a small angle from the second treatment zone 3 towards the interior of the third treatment zone 4, reaching the boundary between the second treatment zone 3 and the first treatment zone 2, and then extend downwards at a large angle to the bottom of the first treatment zone 2. The sieve aperture of the first filter plate 5 is larger than that of the second filter plate 6. The inlet pipe of the septic tank body 1 is located in the second treatment zone 3 and is situated at the first treatment zone 4. Above the highest point of filter plate 5, this configuration achieves efficient graded solid-liquid separation through two-stage filtration with pore sizes decreasing from large to small. Utilizing a unique composite inclined structure that combines small-angle deceleration collection with large-angle acceleration flushing, all trapped solids are intelligently guided to the bottom of the first treatment zone 2 for centralized sedimentation and anaerobic digestion. This significantly improves the solid-liquid separation efficiency and reliability of the second treatment zone 3, substantially reduces the risk of filter plate clogging, and optimizes the functional zoning of each treatment zone. The first treatment zone 2 focuses on sludge treatment, the second treatment zone 3 focuses on preliminary liquid purification and sludge removal, and the third treatment zone 4 focuses on further purification of the liquid, thereby improving overall treatment efficiency and maintenance convenience.

[0030] Domestic sewage flows directly into the second treatment zone 3 through the inlet pipe and falls onto the highest first filter plate 5. Due to the large pore size of the first filter plate 5, it can intercept larger suspended solids, fibers, hair, larger food scraps, paper, etc. in the sewage, which are initially trapped on the surface of the first filter plate 5. After passing through the first filter plate 5, the sewage and smaller particulate matter fall onto the second filter plate 6 below. Due to the smaller pore size of the second filter plate 6, it will perform finer filtration on the sewage, intercepting secondary suspended solids, such as finer particles, some colloidal substances, and small impurities that were not intercepted by the first filter plate 5. The further purified sewage falls to the bottom of the second treatment zone 3 after passing through the second filter plate 6. This two-stage filtration significantly reduces the suspended solids load entering the subsequent treatment zone and reduces the burden on subsequent treatment.

[0031] Throughout the filtration process, solid matter intercepted by the first filter plate 5 and the second filter plate 6 slides downwards along the filter plate surface due to its own weight and the scouring effect of the wastewater. The angle of inclination of the filter plates is relatively small from the starting point near the third treatment zone 4 to the part near the first treatment zone 2, resulting in a relatively slow sliding speed of the solids. This prolongs the contact time with the wastewater, facilitating the partial decomposition of organic matter on the solid surface by microorganisms and preventing them from being washed into the liquid below due to excessive speed. When the filter cake reaches the boundary between the second treatment zone 3 and the first treatment zone 2, the angle of inclination suddenly increases, ensuring that the filter cake is filtered quickly and thoroughly. The wastewater slides down to the bottom of the first treatment zone 2. The inclined surface is less prone to clogging than the horizontal filter plate, greatly reducing the risk of long-term accumulation of filter residue on the filter plate surface. Finally, all solid waste intercepted by the two filter plates is guided and collected to the bottom of the first treatment zone 2. Here, the solid waste mainly undergoes sedimentation and anaerobic digestion, transforming into relatively stable sludge and releasing biogas. After two stages of filtration, the relatively clear sewage flows to the third treatment zone 4 for further purification after accumulating to a certain height. The height of the manure pipe from the second treatment zone 3 to the third treatment zone 4 is lower than the lowest point of the second filter plate 6.

[0032] Reference Figures 1-3Symmetrically distributed sliding rods 7 are fixed above the first filter plate 5. A support rod 8 is slidably sleeved between the two sliding rods 7. Vertically downward telescopic rods 9 are fixed on both sides of the support rod 8. A scraper 10 is fixed between the two telescopic rods 9. A strong spring 11 is sleeved on the outside of the telescopic rod 9. One end of the strong spring 11 presses against the support rod 8, and the other end presses against the scraper 10. A power component for controlling the back-and-forth movement of the support rod 8 is also provided in the second treatment zone 3. With this configuration, the scraper 10 is reciprocated by power drive. With the constant force contact and buffer protection mechanism of the compression spring contraction, the filter residue on the surface of the first filter plate 5 can be cleaned regularly, effectively, and reliably. This fundamentally and significantly reduces the risk of clogging of the first filter plate 5, ensuring the continuity and stability of the treatment process in the second treatment zone 3 of the septic tank and even the entire system. At the same time, it significantly reduces the dependence on and intensity of daily manual maintenance and improves the long-term operating performance of the equipment.

[0033] Under the action of the strong spring 11, the scraper 10 is continuously pushed downward through the telescopic rod 9, so that the bottom of the scraper 10 is in close contact with the surface of the first filter plate 5, ensuring contact force. When the power assembly drives the support rod 8 to move along the fixed slide rod 7, since the scraper 10 is fixed to the support rod 8 through the telescopic rod 9, the scraper 10 also moves with the support rod 8. During the movement, the scraper 10, which is in close contact with the surface of the first filter plate 5, acts like a shovel to scrape and push the filter residue and other debris accumulated on the surface of the first filter plate 5. The filter residue slides downward along the inclined surface of the first filter plate 5 under the push of the scraper 10. During the entire movement of the scraper 10, the strong spring 11 not only maintains the contact force, but also ensures that the scraper 10 is always in contact with the surface. When encountering resistance on the filter plate surface, including but not limited to large hard objects or excessively thick filter cake, the scraper 10 can be slightly lifted upwards by the compression spring and telescopic rod 9 to provide a certain buffering effect and prevent the scraper 10 from getting stuck or damaged, in order to adapt to filter cake layers of different thicknesses. Once the resistance decreases, including but not limited to hard objects being pushed away or scraped over the accumulated filter cake, the strong spring 11 will immediately press the scraper 10 back onto the filter plate surface to continue working. The filter cake pushed by the scraper 10 moves along the surface of the first filter plate 5 and slides down to the junction of the second treatment zone 3 and the first treatment zone 2 under the dual action of scraping by the scraper 10 and its own gravity. Then, it finally slides down to the bottom of the first treatment zone 2 through the large-angle inclined section to concentrate and settle for digestion.

[0034] Reference Figure 2 and Figure 3The scraper 10 has a right-angled triangle cross-section, with one right-angled side attached to the inclined surface of the first filter plate 5. The inclined side is inclined towards the extension direction of the first filter plate 5. This design solves the mechanical problem through geometry, which significantly reduces the scraping driving force and improves the anti-clogging performance. This makes the entire cleaning system smoother, more energy-efficient, more reliable, and more thorough, enhancing the long-term high-efficiency and stable operation of the first filter plate 5 and improving the solid-liquid separation and maintenance convenience of the septic tank pretreatment unit. The inclined side facing the scraping direction serves as a sludge-lifting guide surface, allowing the scraper 10 to smoothly scoop into the bottom of the filter sludge when scraping it. This significantly reduces the driving force required for initial contact and continuous sludge pushing, and also reduces the workload of the scraper 10. Furthermore, the sludge lifting and guiding effect of the inclined side, combined with gravity, allows the filter sludge to quickly detach from the scraper 10, rather than accumulating in front of the scraper 10 and forming a snowball effect that could cause the scraper 10 to become clogged and stuck. The right-angled side being close to the surface of the first filter plate 5 ensures an effective seal, preventing the filter sludge from sliding under the scraper 10.

[0035] In one specific embodiment, when the scraper 10 moves to scrape the filter cake, the inclined side will first contact the accumulated filter cake. Its gentle slope allows the scraper 10 to be inserted more smoothly into the bottom of the filter cake layer or slide under the filter cake along the surface of the first filter plate 5. The resistance is much less than that of the vertical surface, which effectively avoids the filter cake from accumulating or getting stuck in front of the scraper 10. Therefore, the forward movement of the scraper 10 can form a plow-like propulsion. The inclined side continuously shovels up the filter cake in front and lifts it up to the top of the inclined side. At the same time, it pushes forward the remaining filter cake or the filter cake that is close to the surface of the first filter plate 5, which greatly reduces the possibility of the filter cake clogging in front of the scraper 10.

[0036] In one specific embodiment, when the scraper 10 encounters a locally thick or hard filter cake, the inclined design of the bevel makes it easier for it to climb over the obstacle, and the upward component force provided by the bevel helps the scraper 10 lift the filter cake instead of colliding with it head-on. At this time, the strong spring 11 and the telescopic rod 9 work synchronously, allowing the scraper 10 to briefly compress upward to avoid the large resistance. After avoiding the resistance, the strong spring 11 immediately presses back, so that the right-angled edge re-fits the surface of the first filter plate 5. This makes the avoidance action smoother and prevents the scraper 10 from being subjected to sudden impact.

[0037] Reference Figure 2 and Figure 3Multiple dividing plates 12 are fixedly installed on one side of the scraper 10 perpendicular to the first filter plate 5. With this arrangement, when the scraper 10 retracts to avoid the thick filter residue by the pressure spring, the scraper 10 slides over the top of the filter residue. At this time, the dividing plates 12 also adhere tightly to the thick filter residue under the action of the strong spring 11. Their sharp edges can initially divide the thick filter residue, destroy the overall adhesion and continuity of the filter residue, and divide the filter residue into relatively independent small pieces or strip areas. When the scraper 10 makes a return motion, the cutting edge of the dividing plate 12 faces the thick filter residue and punctures it when it collides with the filter residue. At this time, the dividing plate 12 exerts a greater force on the filter residue to break it up more thoroughly. When the scraper 10 scrapes over again, it can push away the broken filter residue. Therefore, the anti-clogging and anti-jamming capabilities of the scraper 10 can be further improved, making the entire cleaning system operate more smoothly.

[0038] Reference Figure 3 and Figure 4 The bottom sides of the dividing plate 12 are fixed with mounting parts 13, and multiple crushing parts 14 are fixed on the mounting parts 13. With this configuration, when the scraper 10 moves back, as the dividing parts pierce and cut the filter residue, the crushing parts 14 will also forcibly insert into, hook, crush, tear or scrape the filter residue on the path, including but not limited to crushing or displacing hard small particles, hooking and wrapping tough fibers or hair around the tooth tips and pulling or tearing them, and scraping and peeling off viscous gel or oil deposits through the blades or protrusions, thereby impacting, scraping and removing stubborn blockages on the edge of the screen or inside the holes. Therefore, it can further remove dirt on the first filter plate 5 and reduce the intensity of subsequent cleaning work.

[0039] Reference Figure 3 and Figure 4 The mounting component 13 extends outward at an expanding angle. With this configuration, the crushing components 14 fixed on the mounting component 13 are also distributed in a larger lateral space. Therefore, a gradually opening channel, similar to a V-shape, is naturally formed at the bottom of the separator and its surrounding area. This expanded entrance can more easily accommodate larger filter cakes or fiber bundles that have been cut by the separator 12 but have not yet completely detached. Within the channel formed by the inclined walls on both sides of the crushing component 14 and the separator 12 above, the material fragments crushed by the crushing component 14, the small pieces cut off, and the entrained sewage have more space to flow. Therefore, the risk of fine material getting stuck at the root or gap of the crushing component 14 and causing local accumulation and blockage can be significantly reduced. The cut material fragments are more likely to slide away from the side and below the open channel with the water flow and gravity.

[0040] Reference Figure 4 and Figure 5The scraper 10 has grooves 15 on both sides of the dividing plate 12. With this arrangement, the material of the scraper 10 around the root of the dividing plate 12 is thinner, and the rigidity of the local area is relatively reduced. When the dividing plate 12 encounters greater resistance or lateral impact during operation, the dividing plate 12 can produce a small elastic bending or swing with the groove 15 as the elastic deformation zone. This limited flexible deformation absorbs and dissipates part of the impact energy, avoiding the stress being completely concentrated at the rigid root of the dividing plate 12 connected to the scraper 10. At this time, the groove 15 distributes the stress relatively evenly to the front and rear areas, significantly reducing the risk of brittle fracture at the root of the dividing plate 12. After the lateral force on the dividing plate 12 disappears, it can rebound to its normal working posture. In addition, the presence of the groove 15 provides an additional open space near the bottom on both sides of the dividing plate 12. When the filter cake is broken, the small debris or flowing sewage generated can be locally drained and discharged through the gaps in these grooves 15, further preventing fine particles from accumulating around the root of the dividing plate 12 for a long time.

[0041] Reference Figure 4 and Figure 5 The groove 15 is inclined, and the inclination is consistent with that of the mounting part 13. This setting allows the filter residue fragments broken by the crushing part 14 to flow more smoothly into the groove 15 and be discharged under the guiding effect of the groove 15.

[0042] Reference Figure 1 and Figure 3 The power component is a screw and slide rail assembly 16 controlled by a motor. The motor is fixed on the inner wall of the second treatment zone 3 away from the water inlet pipe, and the screw is assembled with the motor. The ball nut is fixedly connected to the support rod 8. With this configuration, the motor controls the screw to rotate, and the screw and ball nut cooperate to convert the rotational motion into direct motion, so that the ball nut drives the support rod 8 to move linearly along the screw, thereby controlling the scraper 10 to scrape along the first filter plate 5.

[0043] In one specific embodiment, the motor's operating cycle is controllable. Therefore, the user can set the motor's operating cycle according to the environment in which the septic tank is applied, in order to control the frequency of the scraper 10's reciprocating motion on the first filter plate 5. For example, when the frequency of sewage discharge from the drain pipe is high, including but not limited to public toilets in public places, the scraper 10 scrapes more frequently on the first filter plate 5. When the frequency of sewage discharge from private houses is low, the motor's operating cycle can be extended. Therefore, this septic tank can adaptively adjust the cleaning system according to the needs of the actual scenario.

[0044] In one specific embodiment, all components installed inside the septic tank are made of corrosion-resistant materials and are equipped with appropriate protection and sealing measures, enabling them to adapt well to the harsh environment inside the septic tank, which is humid and contains corrosive gases and liquids.

[0045] In one specific embodiment, the septic tank body 1 is made of reinforced concrete, which has the following advantages: First, reinforced concrete can withstand external loads such as soil pressure and groundwater buoyancy, and can effectively resist the infiltration of internal sewage, reducing the risk of leakage and avoiding pollution of groundwater and surrounding soil. Furthermore, concrete itself is corrosion-resistant and anti-aging, and with the reinforcement of steel bars, the service life of the septic tank can reach more than 70 years, far exceeding that of materials such as plastic and glass, reducing later replacement costs. Second, whether in soft soil foundations, high water levels, or cold regions, reinforced concrete septic tanks can adapt to the environment through reasonable design, are not prone to cracking due to foundation settlement or temperature changes, and can be directly buried in areas with heavy vehicle traffic such as roads and parking lots without additional reinforcement, while materials such as plastic require careful environmental considerations. Thirdly, the hard surface of reinforced concrete can withstand the pressure of biogas and the impact of debris inside the septic tank, reducing maintenance needs. The inner wall can also be smoothed to reduce dirt adhesion, making it easy to clean regularly without structural damage caused by mechanical operations during cleaning. Fourthly, the density of concrete itself, combined with waterproofing during construction, can effectively prevent sewage leakage, protecting groundwater resources and soil ecology. Reinforced concrete is mainly composed of natural or industrial materials such as cement, sand, and steel bars, without releasing harmful chemicals. It can also be recycled after disposal, minimizing its environmental impact. Fifthly, large or irregularly shaped septic tanks can be cast on-site to adapt to different site dimensions. Small septic tanks can be prefabricated and hoisted, shortening the construction cycle. The volume and structure can be flexibly designed according to the number of users and usage scenarios to meet different sewage discharge requirements.

[0046] In one specific embodiment, the rectangular septic tank body 1 can solve the problem of water leakage at the joints caused by the non-integral molding of the circular tank body in the existing market, and effectively improve the compressive strength and impermeability of the septic tank body 1, avoiding the problem of the circular septic tank easily collapsing when heavy vehicles pass over it. At the same time, the protective layer of the rectangular tank body is thicker than that of the circular one, which not only improves its corrosion resistance, but also greatly reduces the carbonation process of concrete and extends the service life of the entire septic tank body 1.

[0047] In one specific embodiment, the septic tank body 1 of this utility model is 13 meters long, 2.8 meters wide, and 0.3 meters thick. After structural calculation, this size has the advantages of low total cost and fast construction speed while meeting the requirements of quality, use and structural safety. It is generally half the construction period of conventional cast-in-place septic tanks, and can greatly reduce the risk of safety accidents in deep foundation pit projects. It can be widely promoted.

[0048] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A rectangular sewage treatment tank, comprising a septic tank body (1), wherein a first treatment zone (2), a second treatment zone (3), and a third treatment zone (4) are sequentially arranged within the septic tank body (1), characterized in that: A first filter plate (5) and a second filter plate (6) are fixedly installed above the second treatment zone (3) from top to bottom. The first filter plate (5) and the second filter plate (6) extend downward at a small angle from the inner wall of the second treatment zone (3) toward the third treatment zone (4) to the junction of the second treatment zone (3) and the first treatment zone (2), and then extend downward at a large angle to the bottom of the first treatment zone (2). The sieve hole diameter of the first filter plate (5) is larger than that of the sieve hole diameter of the second filter plate (6). The water inlet pipe of the septic tank body (1) is opened in the second treatment zone (3) and is located above the highest point of the first filter plate (5).

2. The rectangular sewage treatment tank according to claim 1, characterized in that: A symmetrically distributed sliding rod (7) is fixed above the first filter plate (5). A support rod (8) is slidably sleeved between the two sliding rods (7). Vertically downward telescopic rods (9) are fixed on both sides of the support rod (8). A scraper (10) is fixed between the two telescopic rods (9). A strong spring (11) is sleeved on the outside of the telescopic rod (9). One end of the strong spring (11) presses against the support rod (8), and the other end presses against the scraper (10). A power assembly for controlling the back-and-forth movement of the support rod (8) is also provided in the second processing area (3).

3. A rectangular sewage treatment tank according to claim 2, characterized in that: The cross-section of the scraper (10) is a right triangle, and one right-angled side is attached to the inclined surface of the first filter plate (5), with the inclined side inclined toward the extension direction of the first filter plate (5).

4. A rectangular sewage treatment tank according to claim 3, characterized in that: The scraper (10) is fixed with a plurality of segmented pieces (12) on one side perpendicular to the first filter plate (5).

5. A rectangular sewage treatment tank according to claim 4, characterized in that: The bottom sides of the segment (12) are fixed with mounting parts (13), and multiple broken parts (14) are fixed on the mounting parts (13).

6. A rectangular sewage treatment tank according to claim 5, characterized in that: The mounting component (13) extends outward in an expanding manner.

7. A rectangular sewage treatment tank according to claim 6, characterized in that: The scraper (10) has grooves (15) on both sides of the dividing piece (12).

8. A rectangular sewage treatment tank according to claim 7, characterized in that: The groove (15) is inclined, and the inclination is consistent with that of the mounting part (13).

9. A rectangular sewage treatment tank according to claim 2, characterized in that: The power assembly is a screw and slide rail assembly (16) controlled by a motor. The motor is fixed on the inner wall of the second processing zone (3) away from the water inlet pipe, and the screw is assembled on the motor. The ball nut is fixedly connected to the support rod (8).

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