Precipitation anaerobic clarification filtration multifunctional efficient septic tank

Abstract

The utility model discloses a multifunctional efficient septic tank for precipitation, anaerobic clarification and filtration, and relates to the technical field of sewage or sludge treatment. The precipitation, anaerobic clarification and filtration multifunctional efficient septic tank comprises a septic tank, a water inlet and distribution pipe, a precipitation area, a filtration area, a primary anaerobic area, a secondary anaerobic area, a clarification area and a water outlet pipe, water enters the septic tank from the water inlet and distribution pipe, sequentially flows through the precipitation area, the filtration area, the primary anaerobic area, the secondary anaerobic area and the clarification area, and finally is discharged through the water outlet pipe; five functional zones including a settling zone, a filtering zone, a first-stage anaerobic zone, a second-stage anaerobic zone and a clarifying zone are vertically designed to integrally use a carbon steel anti-corrosion material to construct a water quality purification zone, different structures and functions are set to complete removal of pollutants, a water inlet and distribution pipe penetrates through and is welded on the wall of the septic tank, a water distribution transverse pipe is arranged in the septic tank and is distributed towards two sides, and the water distribution transverse pipe is connected with the water quality purification zone. The transverse pipe on each side is provided with a strip-shaped opening so as to achieve the purpose of uniform water distribution.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage or sludge treatment, in particular to a multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration. Background Art

[0002] my country has a wide distribution of natural villages and a large number of scattered farmers, making it difficult to cover them with sewage pipe networks. Decentralized domestic sewage has become one of the important sources of rural water pollution. Traditional septic tanks have become the mainstream treatment facilities for domestic sewage in many rural areas before direct discharge due to their low cost, simple operation and maintenance, and wide distribution. However, the septic tanks currently in common use are horizontal flow, with scattered and relatively simple settings, which are prone to short-flow and dead water areas, low treatment efficiency, and poor and unstable effluent quality.

[0003] Conventional septic tanks typically have a three-compartment volume ratio of 2:1:3, with a hydraulic retention time of 12 to 24 hours. Their main drawbacks include: 1. Water distribution is uneven. While all three compartments utilize piped water inlet, some improvements employ vertical or horizontal cross-flow structures. However, this still easily leads to short-circuiting within the three compartments, compromising effectiveness. 2. Low mixing intensity, which in turn impacts anaerobic treatment effectiveness. 3. Poor clarification in the final compartment, resulting in high levels of suspended solids and color in the effluent. Conventional septic tanks treat blackwater, while some rural domestic sewage can achieve gray-black separation while others cannot. Currently, septic tanks are used in rural sewage treatment to effectively treat wastewater while reducing treatment costs. However, conventional septic tanks, due to their low treatment efficiency and limited anaerobic digestion effectiveness, often require long treatment times, are large, occupy large areas, and have high construction and maintenance costs. They are also incapable of withstanding water volume and quality shocks, resulting in significant fluctuations in effluent biochemical indicators and failure to consistently meet the requirements of the Agricultural Irrigation Water Quality Standard (GB 5084-2021). Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration, which can solve the problem that the hydraulic retention time of the multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration is longer than that of the traditional septic tank and the effect is poor.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration, comprising a septic tank, a water inlet distribution pipe, a sedimentation zone, a filtration zone, a primary anaerobic zone, a secondary anaerobic zone, a clarification zone and a water outlet pipe, wherein water enters the septic tank through the water inlet distribution pipe, flows through the sedimentation zone, the filtration zone, the primary anaerobic zone, the secondary anaerobic zone, the clarification zone in sequence, and finally exits through the water outlet pipe;

[0006] The five functional areas, namely sedimentation area, filtration area, primary anaerobic area, secondary anaerobic area and clarification area, are designed vertically. The water purification area is constructed using carbon steel anti-corrosion materials as a whole, and different structures and functions are set up to complete the removal of pollutants.

[0007] Preferably, the water inlet distribution pipe is made of carbon steel anti-corrosion material, and the pipe diameter is determined according to the water inlet flow rate. The water inlet distribution pipe passes through and is welded to the wall of the septic tank. Water distribution horizontal pipes are arranged on both sides inside, and each horizontal pipe on each side is provided with strip openings to achieve the purpose of uniform water distribution.

[0008] Preferably, the water depth of the sedimentation area is 1.8 to 2.2 meters, and the hydraulic retention time is 4 to 6 hours. Through sedimentation and fermentation functions, the sewage is divided into an upper manure skin area, a middle manure liquid area and a sinking manure residue area, effectively preventing other substances except manure liquid from flowing into the next area.

[0009] Preferably, the water depth of the filtration area is 1.7 to 2.1 m, the hydraulic retention time is 2 to 4 h, and the interior of the septic tank includes high-density composite filler, suspended filler balls, partition one, partition two, inclined plate and partition three. The high-density composite filler is composed of nylon rope and fiber bundle filler.

[0010] Preferably, the upper end of the high-density composite filler is connected to the suspended filler balls, and the lower end of the high-density composite filler is connected to the bottom plate of the septic tank, forming a filter layer suspended in the tank, which has the ability to adsorb, intercept and filter.

[0011] Preferably, the suspended filler balls located in the filtration area have irregular protrusions on their surface. These protrusions frequently come into contact with sewage and easily form a biofilm containing a large number of microorganisms. After the microorganisms gradually stabilize, the organic pollutants in the sewage are further degraded by the biofilm, effectively improving its sewage treatment effect.

[0012] Preferably, the water depth of the primary anaerobic zone and the secondary anaerobic zone is 1.6 to 2.1 meters, the hydraulic retention time of the two anaerobic zones is 6 to 8 hours, and the septic tank includes baffles 2, 3, 4, folding plate 1, folding plate 2 and an inspection hole. The baffles and folding plates are made of carbon steel anti-corrosion material and are divided into two levels and arranged in an upper and lower order in the anaerobic zone;

[0013] The lower part of the folded plates in the anaerobic zone has a 45° angle to achieve uniform water distribution and fully mix the mud and water, reduce short-flow areas, and make the sewage more evenly distributed during the upward flow, thereby promoting good mud and water mixing and forming an anaerobic mud and water mixing zone. The anaerobic mud and water mixing zone includes a primary anaerobic mud and water mixing zone and a secondary anaerobic mud and water mixing zone, which further remove pollutants such as COD, BOD and suspended solids, and the supernatant flows over the folded plates to the clarification zone.

[0014] Preferably, the outlet pipe in the clarification area is made of carbon steel anti-corrosion material and is located at the outlet of the septic tank. The outlet pipe inlet is located in the middle of the tank body, effectively avoiding scum and sludge, ensuring the water collection effect and outlet water quality. After discharge, the water is directly returned to the field as fertilizer or enters the next treatment unit.

[0015] Preferably, there are 4 inspection holes in total, which are respectively located in the sedimentation area, filtration area, primary anaerobic area and clarification area. The inspection holes are 600mm diameter circular holes with covers made of carbon steel anti-corrosion material extending from the top opening, which are convenient for cleaning, inspection and maintenance.

[0016] Preferably, the total hydraulic retention time of the multifunctional high-efficiency septic tank is 13 to 21 hours, and the surface hydraulic load is about 2.0 to 4.2 m 3 / (m 2 d);

[0017] The volume ratio of the sedimentation zone, filtration zone, anaerobic zone, and clarification zone is approximately 4:2:5:1;

[0018] The operating water depth of the sedimentation zone, filtration zone, anaerobic zone and clarification zone is 1.6 to 2.2 meters.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) The sedimentation anaerobic clarification filtration multifunctional high-efficiency septic tank has a lower hydraulic retention time than that of a traditional septic tank, and a higher hydraulic load than that of a traditional septic tank. The equipment and materials are easy to obtain, the construction is simple, and the project cost is low. The treatment efficiency is significantly improved without increasing the volume.

[0021] (2) The sedimentation anaerobic clarification filtration multifunctional high-efficiency septic tank has five functional zones: sedimentation zone, filtration zone, primary anaerobic zone, secondary anaerobic zone, and clarification zone. The water purification zone is constructed using carbon steel anti-corrosion material as a whole according to the vertical design, and different structures and functions are set up to complete the removal of pollutants. The water inlet distribution pipe passes through and is welded to the wall of the septic tank. Water distribution horizontal pipes are set in the interior to the two sides. Each side of the horizontal pipe is provided with strip openings to achieve the purpose of uniform water distribution.

[0022] (3) The sedimentation anaerobic clarification filtration multifunctional high-efficiency septic tank has the function of separating the waste into layers so that parasites with large specific gravity and their eggs are basically settled at the bottom of the septic tank. The anaerobic environment of the septic tank can effectively decompose proteinaceous organic matter and produce ammonia and other substances to kill parasite eggs and bacteria, while achieving the removal of COD, BOD and SS to a certain extent.

[0023] (4) The sedimentation anaerobic clarification filtration multifunctional high-efficiency septic tank has suspended filler balls located in the filtration area, and its surface has irregular protrusions. These protrusions frequently come into contact with sewage and easily form a biofilm with a large number of microorganisms. After the microorganisms gradually stabilize, the organic pollutants in the sewage are further degraded by the biofilm, effectively improving its sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] Figure 1 This is a schematic diagram of a sedimentation anaerobic clarification filtration multifunctional high-efficiency septic tank of the utility model;

[0026] Figure 2 This is a schematic diagram of a partition of the utility model;

[0027] Figure 3 This is a schematic diagram of the second partition of the utility model;

[0028] Figure 4 This is a schematic diagram of the second folding plate of the utility model;

[0029] Figure 5 This is a schematic diagram of the water distribution horizontal pipe of the utility model;

[0030] Figure 6 This is a schematic diagram of the utility model's suspended filler balls.

[0031] Figure numerals: 1. Water inlet and water distribution pipe; 2. Sedimentation zone; 3. Filtration zone; 4. Primary anaerobic zone; 5. Secondary anaerobic zone; 6. Clarification zone; 7. Outlet pipe; 8. Upper manure skin zone; 9. Middle manure liquid zone; 10. Sinking manure residue zone; 11. High-density composite filler; 12. Suspended filler balls; 13. Primary anaerobic mud-water mixing zone; 14. Secondary anaerobic mud-water mixing zone; 15. Partition one; 16. Partition two; 17. Partition three; 18. Partition four; 19. Folding plate one; 20. Folding plate two; 21. Inclined plate; 22. Water distribution horizontal pipe; 23. Inspection hole. DETAILED DESCRIPTION

[0032] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of this utility model, terms such as "greater than," "less than," and "exceed" are understood to exclude the number indicated, while terms such as "above," "below," and "within" are understood to include the number indicated. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] See also Figure 1 The utility model provides a technical solution: a multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration, comprising a septic tank, a water inlet distribution pipe 1, a sedimentation area 2, a filtration area 3, a primary anaerobic area 4, a secondary anaerobic area 5, a clarification area 6 and an outlet pipe 7. Water enters the septic tank through the water inlet distribution pipe 1, flows through the sedimentation area 2, the filtration area 3, the primary anaerobic area 4, the secondary anaerobic area 5, the clarification area 6 in sequence, and finally exits through the outlet pipe 7.

[0037] The five functional zones, namely sedimentation zone 2, filtration zone 3, primary anaerobic zone 4, secondary anaerobic zone 5 and clarification zone 6, are designed vertically and the water purification zone is constructed with carbon steel anti-corrosion materials as a whole. Different structures and functions are set up to complete the removal of pollutants.

[0038] Further, see Figure 1 、 Figure 2 and Figure 5 The water inlet distribution pipe 1 is made of carbon steel anti-corrosion material. The pipe diameter is determined according to the water inlet flow rate. The water inlet distribution pipe 1 passes through and is welded to the wall of the septic tank. A water distribution horizontal pipe 22 is arranged inside to face both sides. Each side of the horizontal pipe is provided with a strip opening to achieve the purpose of uniform water distribution.

[0039] See also Figure 1The water depth of the sedimentation area 2 is 1.8 to 2.2 meters, and the hydraulic retention time is 4 to 6 hours. Through sedimentation and fermentation functions, the sewage is divided into the upper fecal skin area 8, the middle fecal liquid area 9 and the sinking fecal residue area 10, effectively preventing other substances except fecal liquid from flowing into the next area. The function of the sedimentation area 2 is to stratify the sewage so that the parasites and their eggs with higher specific gravity are basically settled at the bottom of the septic tank. The anaerobic environment of the septic tank can effectively decompose protein organic matter and produce ammonia and other substances to kill parasite eggs and pathogens, while achieving a certain degree of removal of COD, BOD and SS.

[0040] See also Figure 1 、 Figure 3 and Figure 4 The water depth of the filtration area 3 is 1.7 to 2.1 meters, and the hydraulic retention time is 2 to 4 hours. The interior of the septic tank includes a high-density composite filler 11, a suspended filler ball 12, a partition 15, a partition 2 16, an inclined plate 21 and a partition 3 17. The high-density composite filler 11 is composed of nylon rope and fiber bundle filler. The upper end of the high-density composite filler 11 is connected to the suspended filler ball 12, and the lower end of the high-density composite filler 11 is connected to the bottom plate of the septic tank to form a filter layer suspended in the pool. It has the ability to adsorb, intercept and filter, and can further reduce the amount of suspended matter in the effluent. The upper end adopts the form of a float, which is simple, convenient and flexible to clean the scum. The intercepted and settled particles and sludge slide back to the sedimentation area 2 under the action of the inclined plate 21.

[0041] See also Figure 6 The suspended filler balls 12 located in the filtration area 3 have irregular protrusions on their surface. These protrusions frequently come into contact with sewage and easily form a biofilm containing a large number of microorganisms. After the microorganisms gradually stabilize, the organic pollutants in the sewage are further degraded by the biofilm, effectively improving its sewage treatment effect.

[0042] See also Figure 1 、 Figure 3 and Figure 4The water depth of the first-level anaerobic zone 4 and the second-level anaerobic zone 5 is 1.6 to 2.1 meters, and the hydraulic retention time of the two anaerobic zones is 6 to 8 hours. The septic tank includes baffle 2 16, baffle 3 17, baffle 4 18, folding plate 1 19, folding plate 20 and inspection hole 23. The baffles and folding plates are made of carbon steel anti-corrosion material and are divided into 2 levels and arranged in an upper and lower staggered manner in the anaerobic zone. Under the action of the baffles and folding plates, the water flows in an up and down wave shape. The lower part of the folding plates in the anaerobic zone (folding plate 1 19, folding plate 2 20) has a 45° angle to achieve uniform water distribution, and fully mix the mud and water, reduce the short-flow area, and make the sewage more evenly distributed in the upward flow process to promote good mud and water mixing, forming an anaerobic mud and water mixing zone. The anaerobic mud and water mixing zone includes a first-level anaerobic mud and water mixing zone 13 and a second-level anaerobic mud and water mixing zone 14, which further realizes the removal of pollutants such as COD, BOD and suspended solids, and the supernatant flows over the folding plate to the clarification zone 6.

[0043] See also Figure 1 The outlet pipe 7 in the clarification area 6 is made of carbon steel anti-corrosion material and is located at the outlet of the septic tank. The inlet of the outlet pipe 7 is located in the middle of the tank body, which effectively avoids scum and sludge, ensuring the water collection effect and effluent quality. After discharge, the water can be directly reused in the fields as fertilizer or enter the next treatment unit.

[0044] See also Figure 2 There are 4 inspection holes 23, which are located in the sedimentation area 2, the filtration area 3, the primary anaerobic area 4, and the clarification area 6. The inspection hole 23 is a 600mm diameter circular hole with a cover made of carbon steel anti-corrosion material extending from the top opening, which is convenient for cleaning, inspection, and maintenance.

[0045] Key parameters for constructing a multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration:

[0046] The total hydraulic retention time of this multifunctional high-efficiency septic tank is 13 to 21 hours, and the surface hydraulic load is about 2.0 to 4.2 m 3 / (m 2 d);

[0047] The volume ratio of the sedimentation zone, filtration zone, anaerobic zone, and clarification zone is approximately 4:2:5:1;

[0048] The operating water depth of the sedimentation zone, filtration zone, anaerobic zone and clarification zone is 1.6 to 2.2 meters.

[0049] The total hydraulic retention time of this sedimentation anaerobic clarification filtration multifunctional high-efficiency septic tank is 13 to 21 hours, and the surface hydraulic load is about 2.0 to 4.2 m 3 / (m 2 d) During normal operation, the average surface hydraulic load is 2.2 to 3.8 m 3 / (m 2d) The effluent water quality indicators such as COD, BOD and suspended solids meet the agricultural irrigation water quality standards (GB 5084-2021), with COD, BOD and suspended solids removal rates reaching 60%-80%, 50%-70% and 60%-85%, respectively, which are approximately 30%-40%, 20%-30% and 15%-25% higher than those of traditional septic tanks.

[0050] The hydraulic retention time of this sedimentation anaerobic clarification filtration multifunctional high-efficiency septic tank is lower than that of a traditional septic tank, while its hydraulic load is higher than that of a traditional septic tank. The equipment and materials are easily available, the construction is simple, and the project cost is low. The treatment efficiency is significantly improved without increasing the volume, and the biochemical indicators of the effluent water quality meet the requirements of the agricultural irrigation water quality standard (GB 5084-2021).

[0051] The utility model aims at the characteristics of rural domestic sewage and the problem of low treatment efficiency of traditional septic tanks, improves the internal structure of the septic tank, optimizes the internal water flow state, and reduces the dead water area inside the septic tank. A high-density composite filler 11 and a suspended filler ball 12 are arranged in the filter area 3 to form a filter layer, which intercepts and precipitates particles and sludge and slides down to the sedimentation area 2 under the action of the inclined plate. The surface of the suspended filler ball 12 has an irregular convex structure, forming a biofilm with a large number of microorganisms, which can further enhance the removal effect of pollutants. Under the action of the partition and the folding plate, the water flow improves the contact conditions between sewage and sludge and promotes the anaerobic digestion reaction, which can significantly improve its treatment capacity for domestic sewage, provide technical guidance and reference for decentralized domestic sewage treatment in rural areas, and provide rural areas with a high-efficiency, low-cost, low-energy-consumption, easy-to-maintain multifunctional and high-efficiency septic tank device system, creating conditions for decentralized on-site resource utilization of rural domestic sewage and achieving the purpose of improving the rural ecological environment.

[0052] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration, characterized by: The invention comprises a septic tank, a water inlet distribution pipe (1), a sedimentation zone (2), a filtration zone (3), a primary anaerobic zone (4), a secondary anaerobic zone (5), a clarification zone (6) and a water outlet pipe (7). Water enters the septic tank through the water inlet distribution pipe (1), flows through the sedimentation zone (2), the filtration zone (3), the primary anaerobic zone (4), the secondary anaerobic zone (5), the clarification zone (6) in sequence, and finally flows out through the water outlet pipe (7); The five functional zones, namely the sedimentation zone (2), the filtration zone (3), the primary anaerobic zone (4), the secondary anaerobic zone (5), and the clarification zone (6), are designed vertically and constructed using carbon steel anti-corrosion materials to construct the water purification zone. The water inlet distribution pipe (1) is made of carbon steel anti-corrosion material, and the pipe diameter is determined according to the water inlet flow rate. The water inlet distribution pipe (1) passes through and is welded to the wall of the septic tank. Water distribution transverse pipes (22) are arranged on both sides inside, and each transverse pipe on each side is provided with strip openings to achieve the purpose of uniform water distribution.

2. The multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration according to claim 1, characterized in that: The sedimentation zone (2) has a water depth of 1.8 to 2.2 m and a hydraulic retention time of 4 to 6 h. Through sedimentation and fermentation functions, the sewage is divided into an upper manure skin zone (8), a middle manure liquid zone (9) and a sinking manure residue zone (10).

3. The multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration according to claim 1, characterized in that: The water depth of the filtration zone (3) is 1.7 to 2.1 m, and the hydraulic retention time is 2 to 4 h. The interior of the septic tank includes a high-density composite filler (11), suspended filler balls (12), a partition plate 1 (15), a partition plate 2 (16), an inclined plate (21) and a partition plate 3 (17). The high-density composite filler (11) is formed by tying nylon ropes and fiber bundle fillers.

4. The multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration according to claim 3, characterized in that: The upper end of the high-density composite filler (11) is connected to the suspended filler ball (12), and the lower end of the high-density composite filler (11) is connected to the bottom plate of the septic tank to form a filter layer suspended in the tank.

5. The multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration according to claim 1, characterized in that: The suspended filler balls (12) located in the filtering area (3) have a convex structure on their surface.

6. The multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration according to claim 1, characterized in that: The water depth of the primary anaerobic zone (4) and the secondary anaerobic zone (5) is 1.6 to 2.1 m, and the hydraulic retention time of the two anaerobic zones is 6 to 8 h. The septic tank includes a second baffle (16), a third baffle (17), a fourth baffle (18), a folding plate (19), a second folding plate (20) and an inspection hole (23). The baffles and folding plates are made of carbon steel anti-corrosion material and are divided into two levels and arranged alternately in the anaerobic zone in the upper and lower levels. The lower part of the folded plate in the anaerobic zone has a 45° angle to form an anaerobic mud-water mixing zone. The anaerobic mud-water mixing zone includes a primary anaerobic mud-water mixing zone (13) and a secondary anaerobic mud-water mixing zone (14), which further remove COD, BOD and suspended solids pollutants, and the supernatant flows over the folded plate to the clarification zone (6).

7. The multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration according to claim 1, characterized in that: The outlet pipe (7) in the clarification zone (6) is made of carbon steel anti-corrosion material and is located at the outlet of the septic tank. The inlet of the outlet pipe (7) is located in the middle of the tank body, effectively avoiding scum and sludge.

8. The multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration according to claim 6, characterized in that: There are 4 inspection holes (23) in total, which are respectively located in the sedimentation area (2), the filtration area (3), the primary anaerobic area (4), and the clarification area (6). The inspection holes (23) are circular holes with a diameter of 600 mm and a cover made of carbon steel anti-corrosion material with an extended top opening.

9. The multifunctional high-efficiency septic tank with sedimentation, anaerobic clarification and filtration according to claim 1, characterized in that: The total hydraulic retention time of the septic tank is 13 to 21 hours, and the surface hydraulic load is about 2.0 to 4.2 m 3 / (m 2 d); The volume ratio of the sedimentation zone, filtration zone, anaerobic zone, and clarification zone is approximately 4:2:5:1; The operating water depth of the sedimentation zone, filtration zone, anaerobic zone and clarification zone is 1.6 to 2.2 meters.

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