Domestic sewage treatment device

Abstract

The utility model discloses a domestic sewage treatment device which comprises a horizontal tank body, a sand setting area, an anaerobic area, an anoxic area, an aerobic area and a settling area which are sequentially arranged in the horizontal tank body, and a sludge reflux unit and a nitrification liquid reflux unit which are arranged in the horizontal tank body, the horizontal tank body is made of a PPH material; the sand setting zone, the anaerobic zone, the anoxic zone, the aerobic zone and the settling zone are communicated in sequence; domestic sewage reaches the discharge standard after passing through the sand setting zone, the anaerobic zone, the anoxic zone, the aerobic zone and the settling zone; the sludge backflow unit is respectively communicated with the anaerobic zone and the settling zone and is used for enabling sludge in the settling zone to flow back to the anaerobic zone through the sludge backflow unit; and the nitrification liquid backflow unit is respectively communicated with the anoxic zone and the aerobic zone. According to the horizontal tank body, the corrosion resistance and the aging resistance are excellent, the burying depth is reduced due to the structural design of the horizontal tank body, and the construction difficulty and the construction cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a domestic sewage treatment device. Background Art

[0002] With the acceleration of the urbanization process and the improvement of environmental protection awareness, the domestic sewage treatment technology has developed rapidly. Traditional domestic sewage treatment methods usually include steps such as physical sedimentation, biodegradation, and chemical treatment. However, there are some limitations in the existing technologies:

[0003] Material limitation: Many buried sewage treatment devices are made of carbon steel or fiberglass. These materials are prone to rust and corrosion in the underground humid environment, resulting in a short service life and causing secondary pollution to the environment.

[0004] Structural design: Sewage treatment devices with a vertical structure usually require deeper burial, increasing the construction difficulty and cost.

[0005] Functional area division: The functional area division of some devices is not clear enough, resulting in low sewage treatment efficiency and difficulty in meeting the increasingly strict discharge standards.

[0006] Inconvenient maintenance: The existing devices lack convenient inspection and maintenance designs, making it difficult to detect and handle problems in time during the operation of the devices. Content of the Utility Model

[0007] In view of the problems existing in the prior art, the utility model provides a domestic sewage treatment device.

[0008] In order to achieve the above object, the technical solution of the utility model is as follows:

[0009] The utility model provides a domestic sewage treatment device, including: a horizontal tank body, a grit chamber, an anaerobic zone, an anoxic zone, an aerobic zone, and a sedimentation zone sequentially arranged in the horizontal tank body, and a sludge return unit and a nitrification liquid return unit placed in the horizontal tank body;

[0010] The material of the horizontal tank body is PPH material;

[0011] The grit chamber, anaerobic zone, anoxic zone, aerobic zone, and sedimentation zone are sequentially connected; domestic sewage reaches the discharge standard after passing through the grit chamber, anaerobic zone, anoxic zone, aerobic zone, and sedimentation zone;

[0012] The sludge return unit is respectively connected to the anaerobic zone and the sedimentation zone, and is used to return the sludge in the sedimentation zone to the anaerobic zone through the sludge return unit;

[0013] The nitrification liquid return unit is respectively connected to the anoxic zone and the aerobic zone, and is used to return the nitrification liquid in the aerobic zone to the anoxic zone through the nitrification liquid return unit.

[0014] Preferably, the horizontal tank body is circular, and a wedge-shaped annular texture is wound around the horizontal tank body; the bottom of the horizontal tank body is also provided with a plurality of footings, which are semicircular.

[0015] Preferably, a water inlet pipe is provided on the head cover of the horizontal tank body, and a water outlet pipe is provided on the tail cover of the horizontal tank body. The outer surfaces of the head cover and the tail cover of the horizontal tank body are provided with patterns, and the middle part of the inner surface is provided with outwardly radiating reinforcing ribs.

[0016] Preferably, a plurality of partitions are provided in the horizontal tank body to divide the horizontal tank body into the sand settling area, anaerobic area, anoxic area, aerobic area and sedimentation area.

[0017] Preferably, the top of the horizontal tank body is also provided with a plurality of inspection openings, on which inspection manholes are installed for inspecting the conditions of the sand settling area, the anaerobic area, the anoxic area, the aerobic area and the sedimentation area.

[0018] Preferably, the anaerobic zone and the anoxic zone are both equipped with pipes, one end of which is connected to the corresponding inspection manhole; an aeration pipe is installed in the aerobic zone, one end of which is connected to the corresponding inspection manhole; a sludge gas lift pipe is installed in the sedimentation zone, one end of which is connected to the corresponding inspection manhole.

[0019] Preferably, a mud hopper is also installed in the sedimentation area, and one end of the sludge air lift pipe is placed in the mud hopper.

[0020] Preferably, the nitrification liquid reflux unit comprises a nitrification liquid reflux pipe, one end of which is connected to the aerobic zone, and the other end of which is connected to the anoxic zone.

[0021] Preferably, the sludge return unit comprises a sludge return pipe, one end of which is connected to the sludge air lift pipe, and the other end of which is connected to the anaerobic zone.

[0022] Preferably, a sponge filler is provided in the aerobic zone, an ultraviolet sterilizer is also installed in the sedimentation zone, and the water inlet pipe on the head cover is connected to an external sewage lifting pump.

[0023] The technical solution of the utility model has the following beneficial effects:

[0024] The horizontal tank body of the utility model adopts PPH (high performance polypropylene) material, which has excellent corrosion resistance and anti-aging performance. The service life is expected to reach more than 30 years, reducing maintenance costs and environmental pollution.

[0025] The horizontal tank structure design of the utility model reduces the burial depth, reduces the construction difficulty and cost, and at the same time improves the stability and anti-floating performance of the equipment.

[0026] The functional areas of the utility model are clearly defined: by clearly dividing the sand settling area, anaerobic area, anoxic area, aerobic area and sedimentation area in the tank body, the sewage treatment process is optimized, and the treatment efficiency and effluent quality are improved; the sludge reflux and nitrification liquid reflux units are integrated, the biological treatment efficiency is improved, and the stability and reliability of sewage treatment are ensured. Through automated equipment such as aeration pipes and sludge air lift pipes, manual operation is reduced and the automation level of sewage treatment is improved.

[0027] The utility model is convenient for maintenance: multiple inspection manholes are arranged at the top of the device, which is convenient for operators to inspect and maintain each functional area, and timely discover and handle problems in the operation of the equipment.

[0028] The utility model has environmental protection performance: PPH material is an environment-friendly material and can be recycled, reducing environmental pollution during the life cycle of the equipment; the application of the ultraviolet disinfection device ensures the safety of the treated water quality and meets the high-standard discharge requirements. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of the utility model;

[0030] Figure 2 is a schematic internal structure diagram of the horizontal tank body of the utility model Figure 1 ;

[0031] Figure 3 is a schematic internal structure diagram of the horizontal tank body of the utility model Figure 2 ;

[0032] Figure 4 is a schematic diagram of each functional area inside the horizontal tank body of the utility model. Detailed Description of the Specific Embodiment

[0033] The embodiments of the utility model are described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the utility model and should not be construed as a limitation of the utility model.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0036] In the present utility model, unless otherwise clearly specified and defined, the terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0038] Referring to Figures 1 to 4 , the present utility model provides a domestic sewage treatment device with a horizontal structure made of PPH material, including: a horizontal tank body 1, a grit chamber 100, an anaerobic zone 200, an anoxic zone 300, an aerobic zone 400 and a sedimentation zone 500 which are sequentially arranged in the horizontal tank body 1, and a sludge return unit 7 and a nitrification liquid return unit 6 disposed in the horizontal tank body;

[0039] The grit chamber 100, anaerobic zone 200, anoxic zone 300, aerobic zone 400, and sedimentation zone 500 are connected in sequence; domestic sewage reaches the discharge standard after passing through the grit chamber 100, anaerobic zone 200, anoxic zone 300, aerobic zone 400, and sedimentation zone 500;

[0040] The sludge return unit 7 is respectively connected to the anaerobic zone 200 and the sedimentation zone 500, and is used to return the sludge in the sedimentation zone to the anaerobic zone 200 through the sludge return unit 7;

[0041] The nitrification liquid return unit 6 is respectively connected to the anoxic zone 300 and the aerobic zone 400, and is used to return the nitrification liquid in the aerobic zone 400 to the anoxic zone 300 through the nitrification liquid return unit 6.

[0042] Furthermore, the material of the horizontal tank body 1 is PPH material and it is circular. Wedge-shaped annular textures (not shown in the figure) are wound around the horizontal tank body; among them, the horizontal tank body is the main structure of the entire domestic sewage treatment device. The horizontal tank body is made of PPH material, which has the characteristics of corrosion resistance and aging resistance, ensuring the long-term stable operation of the device. The circular design of the horizontal tank body 1 helps to reduce the floor area and optimize the space utilization; the horizontal tank body 1 is manufactured by the high-temperature PPH material spiral extrusion winding one-time molding technology, which has high strength, is completely symmetrical in appearance structure, is suitable for mechanical automatic processing and manufacturing, and has a harmonious and unified external visual sense; the wedge-shaped annular textures wound around the periphery of the horizontal tank body strengthen the annular strength of the horizontal tank body and at the same time enrich the appearance of the horizontal tank body. The anaerobic, anoxic, aerobic and other functional areas required for sewage treatment are arranged inside the horizontal tank body 1 to meet the process requirements of sewage treatment. The main components of the horizontal tank body 1 include the partition plate 4, inspection manhole 3, head, anchor feet 2, etc., all of which are formed by molding processes such as PPH material die pressing, rotational molding or injection molding, with stable quality and exquisite appearance;

[0043] Among them, PPH (high-performance polypropylene) materials are commonly used in the production of equipment containers in industries with heavy pollution and high corrosion, such as chemical engineering, electroplating, and surface treatment. For example, PPH pickling tanks and electrolytic cells are both economical and durable, reducing equipment maintenance and extending service life. They have superior performance. The raw material production, processing, etc. of PPH materials do not produce pollution, making them ideal materials for the chemical industry. Given the physical and chemical stability of PPH, it is suitable for underground humid and weakly acidic (domestic sewage nature) environments and has broad market prospects in the processing and production of buried sewage treatment equipment. PPH (high-performance polypropylene) is a homopolymer polypropylene with high molecular weight and low melt flow rate, which is a modified polypropylene chemically improved to address the defects of poor impact resistance and poor weather resistance of polypropylene at low temperatures. It has a delicate crystalline structure after β modification, enabling it to have excellent impact strength at low temperatures, increasing the hydrostatic strength, and enhancing the chemical resistance (corrosion resistance) performance. In the manufacturing and processing of horizontal domestic sewage treatment devices, when adding anti-UV additives and anti-aging additives during the mixing and kneading of raw materials, the weather resistance and service life of the device products can be increased; adding alkali-free glass fiber can improve the flexural modulus, hardness, and heat distortion temperature of the device, which is reflected in the stability (no deformation) of the device shape under the extrusion and stretching conditions during transportation and landfill. That is, by adding substances such as UV additives, anti-aging additives, and alkali-free glass fiber to the homopolymer polypropylene raw materials, PPH composite plates with excellent performance can be produced and widely used in the processing of device equipment in different application fields. The structure of the horizontal tank body 1 can reduce the burial depth, investment, and operation costs compared to vertical equipment; when used in stations with a high groundwater level, it can reduce the buoyancy of the device by groundwater, avoid overly complex device structure design, and reduce the anti-floating design.

[0044] Furthermore, a plurality of anchor feet 2 are provided at the bottom of the horizontal tank body 1. The anchor feet 2 support the entire horizontal tank body 1 to ensure its stable placement and prevent tilting or movement; a water inlet pipe 1010 is also provided on the head end cover 101 of the horizontal tank body 1, which is located on the head end cover 101 of the horizontal tank body 1 and is used to introduce domestic sewage into the grit chamber 100. A water outlet pipe 1020 is also provided on the tail end cover 102 of the horizontal tank body 1 to discharge the treated supernatant from the sedimentation area 500. ， Patterns (not shown in the figure) are provided on the outer surfaces of the head end cover 101 and the tail end cover 102 of the horizontal tank body 1, and outwardly radiating reinforcing ribs 112 are provided in the middle of the inner surface. The reinforcing ribs 112 are provided on the inner surface of the head and tail end covers of the horizontal tank body 1, enhancing the structural strength of the end covers and preventing deformation caused by pressure changes.

[0045] Furthermore, a plurality of partition plates 4 are provided inside the horizontal tank body 1, which divides the horizontal tank body 1 into the sand sedimentation area 100, anaerobic area 200, anoxic area 300, aerobic area 400, and sedimentation area 500. The partition plates 4 divide the interior of the horizontal tank body 1 into different functional areas, ensuring that the sewage is treated according to a predetermined process in each functional area; among them, the sand sedimentation area 100: located at the starting part of the horizontal tank body 1, is used for initially separating large particle sediment in the sewage and reducing the load of subsequent treatment units; the anaerobic area 200: after the sand sedimentation area 100, the anaerobic area 200 provides an anaerobic environment for microorganisms, promoting the growth of certain specific microorganisms, such as polyphosphate-accumulating bacteria, which helps the release of phosphorus; the anoxic area 300: the anoxic area 300 provides a low-oxygen environment for denitrifying bacteria, and these bacteria can reduce nitrate to nitrogen gas, thereby realizing the denitrification process; the aerobic area 400: the aerobic area 400 is the main place for nitrification reaction. The sufficient oxygen supply enables ammonia nitrogen to be converted into nitrate, and at the same time, the organic matter is further degraded; the sedimentation area 500: the sedimentation area 500 is used for separating mud and water. The mixed liquid after aerobic treatment is precipitated here, and the supernatant is discharged after reaching the standard, while the sludge at the bottom is subjected to subsequent treatment.

[0046] Furthermore, a plurality of inspection openings are also provided at the top of the horizontal tank body 1, and inspection manholes 3 are installed on the inspection openings, which are used to inspect the sand sedimentation area 100, anaerobic area 200, anoxic area 300, aerobic area 400, and sedimentation area 500, facilitating the operator to enter the interior of the horizontal tank body 1 for inspection, maintenance, and cleaning.

[0047] Furthermore, pipe fittings 10 are installed in both the anaerobic area 200 and the anoxic area 300, and one end of the pipe fittings 10 is communicated with the corresponding inspection manhole 3; an aeration pipe 20 is installed in the aerobic area 400, and one end of the aeration pipe 20 is communicated with the corresponding inspection manhole 3. The aeration pipe 20 is installed in the aerobic area 400 to provide oxygen to the aerobic area 400 and promote the activity of nitrifying bacteria; a sludge air-lift pipe 7 is installed in the sedimentation area 500, and one end of the sludge air-lift pipe 7 is communicated with the corresponding inspection manhole 3. The sludge air-lift pipe 7 is installed in the sedimentation area 500 to transport the sludge at the bottom of the sedimentation area 500 to other treatment units by air-lift.

[0048] Furthermore, a sludge hopper 8 is also installed in the sedimentation area 500, and one end of the sludge air-lift pipe 7 is placed inside the sludge hopper 8. The sludge hopper 8 is installed in the sedimentation area 500 to collect the precipitated sludge, facilitating the collection and transportation of the sludge air-lift pipe 7.

[0049] Further, the nitrification liquid reflux unit 5 includes a nitrification liquid reflux pipe. One end of the nitrification liquid reflux pipe communicates with the aerobic zone 400, and the other end communicates with the anoxic zone 300. The nitrification liquid reflux unit returns the nitrification liquid in the aerobic zone to the anoxic zone 300 through the nitrification liquid reflux pipe, increasing the alkalinity of the anoxic zone 300 and promoting the denitrification reaction. The sludge reflux unit 6 includes a sludge reflux pipe. One end of the sludge reflux pipe communicates with the sludge air-lift pipe 7, and the other end communicates with the anaerobic zone 200. The sludge reflux pipe 7 returns the sludge in the sedimentation zone 500 to the anaerobic zone 200 to maintain the sludge concentration in the system and ensure the treatment effect.

[0050] Further, sponge fillers are provided in the aerobic zone 400. The sponge fillers in the aerobic zone provide a surface for the attachment and growth of microorganisms, increasing the biomass of microorganisms and improving the treatment efficiency. An ultraviolet disinfection device is also installed in the sedimentation zone 500. The ultraviolet disinfection device in the sedimentation zone is used to disinfect the treated supernatant to ensure that the discharged water quality meets the sanitary standards. The water inlet pipe 1010 on the head head 101 communicates with an external sewage lift pump, and the sewage lift pump is used to lift domestic sewage to the grit chamber of the treatment device to ensure the continuity and stability of sewage treatment.

[0051] The working principle of the present utility model:

[0052] Domestic sewage is transported to the grit chamber 100 outside the device by a lift pump. The sediment in the sewage is separated from the sewage under the action of gravity. The sediment is regularly suctioned and discharged externally. The sewage without sediment in the upper part flows into the anaerobic zone 200 automatically and is mixed with the returned sludge from the sedimentation zone 200. Under anoxic conditions, nitrates and oxygen in the returned sludge are fully removed to create a strict anaerobic environment in the anaerobic zone, strengthening the effect of anaerobic phosphorus release by polyphosphate-accumulating organisms to ensure that their phosphorus uptake efficiency in the aerobic zone is fully improved. The mixed liquid after phosphorus release in the anaerobic zone enters the anoxic zone 300 and undergoes denitrification reaction with the nitrified liquid returned from the aerobic zone 400. Denitrifying bacteria use nitrates as electron acceptors under the condition of extremely low dissolved oxygen concentration, reducing nitrates to nitrogen gas and discharging it from the system, thereby realizing the denitrification process of sewage in the anoxic zone 300. Part of the alkalinity provided by the denitrification reaction in the anoxic zone 300 supplements the alkalinity required for the subsequent nitrification reaction in the aerobic zone 400. The mixed liquid after denitrification in the anoxic zone 300 enters the aerobic zone 400. Using nitrifying bacteria and zoogloea with a wide variety and large biomass attached to the fluidized soft bio-mass increasing sponge body filler, under the condition of sufficient dissolved oxygen, ammonia nitrogen is completely nitrified into nitrate nitrogen, and organic carbon is completely converted into carbon dioxide and water; part of the nitrified liquid is returned from the aerobic zone 400 to the anoxic zone 300 to control the reflux ratio of the nitrified liquid and improve the denitrification removal effect; polyphosphate-accumulating organisms decompose PHA (polyhydroxyalkanoate) stored in cells to complete phosphorus uptake, forming high-concentration phosphorus-containing sludge. Thus, the aerobic zone 400 mainly realizes the functions of degrading residual organic matter, nitrifying ammonia nitrogen, and excessive phosphorus uptake. The mixed liquid after aerobic treatment enters the sedimentation zone 500 for sediment-water separation. The supernatant is disinfected and discharged up to the standard. Part of the sludge at the bottom is returned to the anaerobic zone 200 to maintain the sludge concentration and the number of microorganisms in the system to ensure that the sewage meets the standard, and the other part is used as surplus sludge to achieve the goal of biological phosphorus removal and is regularly discharged and disposed of externally.

[0053] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A domestic sewage treatment device, characterized in that: include: A horizontal tank body, wherein a sand settling area, an anaerobic area, an anoxic area, an aerobic area and a sedimentation area are sequentially arranged in the horizontal tank body, and a sludge return unit and a nitrification liquid return unit are arranged in the horizontal tank body; The material of the horizontal tank body is PPH material; The grit settling area, anaerobic area, anoxic area, aerobic area, and sedimentation area are connected in sequence; the domestic sewage reaches the discharge standard after passing through the grit settling area, anaerobic area, anoxic area, aerobic area, and sedimentation area; The sludge return unit is connected to the anaerobic zone and the sedimentation zone respectively, and is used to return the sludge in the sedimentation zone to the anaerobic zone through the sludge return unit; The nitrification liquid reflux unit is connected to the anoxic zone and the aerobic zone respectively, and is used to make the nitrification liquid in the aerobic zone reflux to the anoxic zone through the nitrification liquid reflux unit.

2. The domestic sewage treatment device according to claim 1, characterized in that: The horizontal tank body is circular, and a wedge-shaped ring texture is wound around the horizontal tank body; a plurality of footings are provided at the bottom of the horizontal tank body, and the footings are semicircular.

3. The domestic sewage treatment device according to claim 2, characterized in that: The head cover of the horizontal tank body is also provided with a water inlet pipe, and the tail cover of the horizontal tank body is also provided with a water outlet pipe. The outer surfaces of the head cover and the tail cover of the horizontal tank body are both provided with patterns, and the middle part of the inner surface is provided with outwardly radiating reinforcing ribs.

4. The domestic sewage treatment device according to claim 3, characterized in that: The horizontal tank body is provided with a plurality of partitions, which divide the horizontal tank body into the sand settling area, the anaerobic area, the anoxic area, the aerobic area and the sedimentation area.

5. The domestic sewage treatment device according to claim 4, characterized in that: The top of the horizontal tank body is also provided with a plurality of inspection openings, on which inspection manholes are installed for inspecting the conditions of the sand settling area, the anaerobic area, the anoxic area, the aerobic area and the sedimentation area.

6. The domestic sewage treatment device according to claim 5, characterized in that: The anaerobic zone and the anoxic zone are both equipped with pipe fittings, one end of which is connected to the corresponding inspection manhole; the aerobic zone is equipped with an aeration pipe, one end of which is connected to the corresponding inspection manhole; the sedimentation zone is equipped with a sludge gas lift pipe, one end of which is connected to the corresponding inspection manhole.

7. The domestic sewage treatment device according to claim 6, characterized in that: A mud bucket is also installed in the sedimentation area, and one end of the sludge gas lift pipe is placed in the mud bucket.

8. The domestic sewage treatment device according to claim 6, characterized in that: The nitrification liquid reflux unit comprises a nitrification liquid reflux pipe, one end of which is connected to the aerobic zone, and the other end of which is connected to the anoxic zone.

9. The domestic sewage treatment device according to claim 6, characterized in that: The sludge return unit comprises a sludge return pipe, one end of which is connected to the sludge air lift pipe, and the other end of which is connected to the anaerobic zone.

10. The domestic sewage treatment device according to claim 8, characterized in that: The aerobic zone is provided with a sponge filler, the sedimentation zone is also provided with an ultraviolet sterilizer, and the water inlet pipe on the head cover is communicated with an external sewage lifting pump.

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