A decentralized domestic sewage treatment system with separate quality and low consumption

Abstract

A kind of decentralized domestic sewage quality low consumption treatment system, it is related to domestic sewage treatment field, including sewage treatment enclosure, the inner chamber top of the sewage treatment enclosure is equipped with mesh filter assembly for intercepting large block impurities in domestic sewage at open position, the bottom of the sewage treatment enclosure is equipped with multiple medium filter layer, biological treatment layer and disinfection layer from top to bottom respectively, the mesh filter assembly includes intercepting net bag one, several intercepting net bag two are arranged in the inner chamber of the intercepting net bag one, the utility model discloses by multilayer level collaborative processing, the efficient removal of suspended solids, organic matter, nitrogen and phosphorus and pathogen in domestic sewage is realized, and mesh filter assembly can be partially disassembled maintenance, avoid the influence of shutdown on overall operation, the system has the characteristics such as small footprint, low investment, low operating energy consumption, maintenance is convenient, especially suitable for rural, scenic spot etc. Dispersed scene, with environmental friendliness and economic feasibility.

Description

Technical Field

[0001] This utility model relates to the field of domestic sewage treatment, and in particular to a decentralized, low-consumption domestic sewage treatment system. Background Technology

[0002] Traditional centralized wastewater treatment plants rely on large-scale pipeline construction and long-distance transportation, which has problems such as high initial investment, complex pipeline operation and maintenance, and large land occupation. They are difficult to adapt to the needs of sparsely populated or complex terrain areas. In addition, the centralized treatment mode is sensitive to water quality fluctuations and requires the addition of additional chemical agents to stabilize the treatment effect, which leads to increased operating costs.

[0003] Decentralized wastewater treatment technology, through miniaturized and localized treatment units, treats wastewater directly at or near the source, avoiding the difficulties of pipeline laying and reducing construction and operating costs. However, we have found that while some existing decentralized treatment technologies in rural areas have certain advantages, they generally suffer from the problem of not being able to process filtered materials in a timely manner. In some cases, waste accumulates in the screens, causing a significant decrease in the initial filtration effect. Cleaning requires shutting down the entire system, which is very inconvenient and also affects the treatment of domestic sewage. Utility Model Content

[0004] The purpose of this invention is to provide a decentralized, low-consumption domestic sewage treatment system to solve the problems mentioned in the background art.

[0005] The technical problem solved by this utility model is achieved through the following technical solution:

[0006] A decentralized, low-consumption domestic sewage treatment system includes a sewage treatment enclosure. A mesh filter assembly for intercepting large impurities in the sewage is installed at the opening of the top of the inner cavity of the sewage treatment enclosure. From top to bottom, the bottom of the sewage treatment enclosure is equipped with a multi-media filter layer, a biological treatment layer, and a disinfection layer. The mesh filter assembly includes an intercepting net bag I, with a hanging plate fixedly installed on its upper surface. The upper end of the hanging plate is fixedly connected to the side wall at the opening of the top of the sewage treatment enclosure. Several intercepting net bags II are distributed within the inner cavity of the intercepting net bag I.

[0007] Preferably, the horizontal plate of the hanging plate is provided with a protrusion, and the protrusion is provided with a plurality of concave cavities evenly distributed. The upper end face of the second intercepting net is fixedly installed with a fixing frame, the upper end face of the fixing frame slides against the lower end face of the protrusion, and the fixing frame can pass through the concave cavities.

[0008] Preferably, a partition plate is provided between adjacent parts of the multi-media filtration layer, the biological treatment layer, and the disinfection layer.

[0009] Preferably, the bottom of the interception net is fixedly equipped with guide plates at both ends.

[0010] Preferably, a handle is fixedly installed on the upper end face of the fixing frame.

[0011] Preferably, a window protective cover is installed on the upper end face of the wastewater treatment enclosure at the top opening position.

[0012] The advantages and positive effects of this utility model are:

[0013] This invention achieves efficient removal of suspended solids, organic matter, nitrogen and phosphorus, and pathogens from domestic sewage through multi-level synergistic treatment (physical filtration + biodegradation + disinfection). The mesh filter assembly can be partially disassembled for maintenance, avoiding downtime from affecting overall operation. The multi-media filter layer, combined with materials of different densities and particle sizes, significantly improves the interception efficiency of suspended solids and some organic matter. The system features small footprint, low investment, low operating energy consumption, and convenient maintenance, making it particularly suitable for decentralized scenarios such as rural areas and scenic spots. It is both environmentally friendly and economically feasible. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a front view schematic diagram of the overall cross-section of a decentralized domestic sewage treatment system with low energy consumption according to this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of a mesh filter component in a decentralized, low-consumption domestic sewage treatment system according to this utility model.

[0017] Figure 3 This is a schematic diagram of the intercepting net bag structure, a component of a decentralized, low-consumption domestic sewage treatment system according to this utility model.

[0018] Figure 4 This is a schematic diagram of the intercepting net bag structure, a component of a decentralized, low-consumption domestic sewage treatment system according to this utility model.

[0019] Figure 5 This is a schematic diagram of the interception net bag, a component of a decentralized, low-consumption domestic sewage treatment system according to this utility model.

[0020] Figure 6 This utility model Figure 5 A magnified schematic diagram of the local structure at point A in the middle.

[0021] The markings in the attached diagram are described as follows: 10. Wastewater treatment enclosure; 11. Multi-media filter layer; 12. Biological treatment layer; 13. Disinfection layer; 14. Partition plate; 15. Outlet pipe; 16. Guide plate; 17. Interception net bag one; 18. Interception net bag two; 19. Inlet pipe; 20. Hanging plate; 21. Fixing frame; 22. Window protective cover; 23. Handle; 24. Protrusion; 25. Concave cavity. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in an illustrative manner. Therefore, they only show the components related to the present invention.

[0023] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0024] The following is combined with Figure 1-6 This utility model will be described in detail below. For ease of description, the directions mentioned below are defined as follows: the directions of up, down, left, right, front, and back mentioned below are the same as... Figure 1 The directions of front, back, left, right, up, and down in the view are consistent. Figure 1 The directions shown are consistent with the front-facing, back-facing, left-right, up-down directions of the device.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of at least two elements or the interaction relationship of at least two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings: Please refer to Figure 1-6This utility model provides an embodiment of a decentralized, low-consumption domestic sewage treatment system, including a sewage treatment enclosure 10, which can be installed underground. A mesh filter assembly for intercepting large impurities in domestic sewage is installed at the top opening of the inner cavity of the sewage treatment enclosure 10. This assembly is mainly used to intercept and treat large solid wastes such as paper, plastic, and cloth strips in domestic sewage. Water inlet pipes 19 are fixedly connected to both sides of the sewage treatment enclosure 10. Domestic sewage is discharged into the mesh filter assembly through the water inlet pipes 19 for preliminary filtration. At the bottom of the sewage treatment enclosure 10, from top to bottom, a multi-media filter layer 11, a biological treatment layer 12, and a disinfection layer 13 are installed, which are separated by a partition plate 14 to perform deep treatment on the pre-filtered domestic sewage. The multi-media filter layer 11 is divided into four layers, from bottom to top: refined quartz sand, sea sand, anthracite, and garnet. It is mainly used to remove suspended solids and some organic matter in the water. The filtration efficiency and effect are improved by combining materials with different particle sizes and densities. Although they are effective at removing physical impurities, such a filtration layer alone is not enough for the treatment of biological wastewater. Therefore, the biological treatment layer 12 and the disinfection layer 13 are also required. The main purpose of the biological treatment layer 12 is to use microorganisms to decompose organic matter in wastewater and reduce BOD (biochemical oxygen demand) and COD (chemical oxygen demand). The disinfection layer 13 disinfects the domestic wastewater after physical filtration and biological treatment, and finally discharges it through the effluent pipe 15.

[0027] It is worth mentioning that, in this embodiment, the mesh filter assembly includes an intercepting net bag 17, with a hanging plate 20 fixedly installed on the upper surface of the intercepting net bag 17. The upper end of the hanging plate 20 is fixedly connected to the side wall of the opening at the top of the sewage treatment enclosure 10. Several intercepting net bags 18 are distributed in the inner cavity of the intercepting net bag 17. A protrusion 24 is provided on the horizontal plate portion of the hanging plate 20. Several concave cavities 25 are evenly distributed in the protrusion 24. A fixing frame 21 is fixedly installed on the upper surface of the intercepting net bag 18. A handle 23 is fixedly installed on the upper surface of the fixing frame 21. The upper surface of the fixing frame 21 slides against the lower surface of the protrusion 24. The fixing frame 21 can pass through the concave cavities 25, allowing domestic sewage to flow through... The wastewater is discharged through the inlet pipe 19, passes through the first interception net 17 and the second interception net 18 to intercept large pieces of material, and then falls into the treatment area at the bottom of the inner cavity of the sewage treatment enclosure 10. After long-term interception and filtration of domestic sewage, large pieces of material will accumulate. At this time, the accumulated interception net 18 can be removed separately for treatment. By holding the handle 23, the fixing frame 21 is slid out along the concave cavity 25 to remove the accumulated interception net 18 for garbage removal. At this time, the remaining interception nets 18 that have not accumulated can be moved to the area where the accumulation occurred, so that the accumulation can be cleaned without shutting down the entire system, which is very convenient.

[0028] It should be noted that, in this embodiment, the bottom of the interception net bag 17 is fixedly installed with guide plates 16 at both ends, so that the pre-filtered sewage is guided along the guide plates 16 to the bottom treatment area.

[0029] It should also be noted that a window protective cover 22 is installed on the upper surface of the sewage treatment enclosure 10 at the top opening position.

[0030] In specific implementation, a rural community (50 households, with an average daily sewage discharge of approximately 50 cubic meters) 3 The decentralized, low-consumption domestic sewage treatment system of this invention is used to treat domestic sewage throughout the entire process. The system is installed underground with only a maintenance window on the top, so it does not affect the ground landscape.

[0031] Operating steps and corresponding effects

[0032] Step 1: Wastewater inlet and preliminary filtration

[0033] Domestic sewage (including washing wastewater, kitchen wastewater, and toilet wastewater) enters the system through the underground inlet pipe 19. The sewage first enters the mesh filter assembly. The intercepting net 17 and the intercepting net 2 18 work together to filter out large solid waste (particle size > 5 mm) such as paper, plastic bags, and cloth strips. Large impurities are intercepted to prevent clogging of subsequent treatment units. After preliminary filtration, the concentration of suspended solids (SS) in the sewage is reduced from 300 mg / L to 150 mg / L. The guide plate 16 evenly guides the filtered sewage into the multi-media filter layer 11 at the bottom of the sewage treatment enclosure 10.

[0034] Step 2: Multi-media filtration layer treatment

[0035] The multi-media filter layer 11 consists of the following layers from bottom to top:

[0036] Refined quartz sand (particle size 0.5-1 mm)

[0037] Sea sand (particle size 1-2 mm)

[0038] Anthracite (particle size 2-4 mm)

[0039] Garnet (4-6 mm in diameter)

[0040] In the treatment process, wastewater passes through four layers of media from top to bottom. Materials with different particle sizes and densities intercept suspended solids and some organic matter in stages. Refined quartz sand and sea sand remove fine particles (<0.5 mm); anthracite adsorbs dissolved organic matter; garnet further intercepts residual particles. The SS concentration is reduced from 150 mg / L to below 20 mg / L, the chemical oxygen demand (COD) is reduced from 200 mg / L to 80 mg / L, and the suspended solids removal rate is >90%, providing stable influent conditions for subsequent biological treatment.

[0041] Step 3: Biological treatment layer degrades organic matter

[0042] The biological treatment layer 12 is filled with biofilm packing material (such as ceramsite or elastic packing material), and a large number of aerobic microorganisms are attached to the surface. Oxygen is provided by an aeration system (not shown in the patent drawings, but actually required) to maintain the activity of microorganisms. Organic matter (such as protein and carbohydrates) in wastewater is degraded into CO2, H2O and microbial cell matter by microorganisms on the biofilm. Nutrients such as nitrogen and phosphorus are removed through nitrification-denitrification. BOD5 (biochemical oxygen demand) is reduced from 80 mg / L to below 10 mg / L, COD is reduced from 80 mg / L to 30 mg / L, ammonia nitrogen (NH3-N) is reduced from 20 mg / L to 1.5 mg / L, and total phosphorus (TP) is reduced from 4 mg / L to 0.5 mg / L.

[0043] Step 4: Sterilize the disinfectant layer to inactivate pathogens.

[0044] Disinfection layer 13 uses an ultraviolet disinfection device (or a sodium hypochlorite dosing system, selected according to actual needs). The ultraviolet system destroys the DNA / RNA of bacteria and viruses by irradiation, while sodium hypochlorite inactivates microorganisms through oxidation. After biological treatment, the sewage flows through the disinfection layer and comes into contact with the ultraviolet lamp or sodium hypochlorite solution for more than 30 seconds. Pathogenic microorganisms such as Escherichia coli and fecal coliforms are inactivated to below the detection limit (<1 CFU / 100 mL), and the effluent meets the Class I standard of the "Water Pollutant Discharge Standard for Rural Domestic Sewage Treatment Facilities" (DB33 / 973-2015).

[0045] Step 5: Wastewater Discharge and System Maintenance

[0046] The treated wastewater is discharged into the ecological pond through the outlet pipe 15 or directly reused for farmland irrigation, greening, etc.

[0047] Water quality indicators:

[0048] COD ≤ 50 mg / L

[0049] BOD5 ≤ 10 mg / L

[0050] NH3-N ≤ 5 mg / L

[0051] TP ≤ 0.5 mg / L

[0052] SS ≤ 10 mg / L

[0053] Cleaning the mesh filter assembly: When the intercepting mesh bag 2 18 accumulates garbage, the operator holds the handle 23 and slides the fixing frame 21 out along the concave cavity 25 of the protrusion 24 to remove the accumulated mesh bag 2 18 for cleaning. After cleaning, the mesh bag 2 18 is reinserted into other non-accumulated areas. Maintenance can be completed without shutting down the system.

[0054] It should be emphasized that the embodiments described in this utility model are illustrative rather than limiting. Therefore, this utility model is not limited to the embodiments described in the specific implementation. Any other implementation methods derived by those skilled in the art based on the technical solutions of this utility model are also within the scope of protection of this utility model.

Claims

1. A decentralized, low-consumption domestic sewage treatment system, comprising a sewage treatment enclosure (10), characterized in that: The top of the inner cavity of the sewage treatment enclosure (10) is equipped with a mesh filter assembly for intercepting large impurities in domestic sewage at the opening position. The bottom of the sewage treatment enclosure (10) is equipped with a multi-media filter layer (11), a biological treatment layer (12) and a disinfection layer (13) from top to bottom. The mesh filter assembly includes an interception net bag one (17). A hanging plate (20) is fixedly installed on the upper end of the interception net bag one (17). The upper end of the hanging plate (20) is fixedly connected to the side wall at the opening position of the top of the sewage treatment enclosure (10). Several interception net bags two (18) are distributed in the inner cavity of the interception net bag one (17).

2. The decentralized, low-consumption domestic sewage treatment system according to claim 1, characterized in that: The horizontal plate of the hanging plate (20) is provided with a protrusion (24), and a plurality of concave cavities (25) are evenly distributed in the protrusion (24). A fixing frame (21) is fixedly installed on the upper end face of the second intercepting net bag (18). The upper end face of the fixing frame (21) slides against the lower end face of the protrusion (24), and the fixing frame (21) can pass through the concave cavity (25).

3. The decentralized, low-consumption domestic sewage treatment system according to claim 2, characterized in that: A partition plate (14) is provided between the three adjacent layers: the multi-media filtration layer (11), the biological treatment layer (12), and the disinfection layer (13).

4. The decentralized, low-consumption domestic sewage treatment system according to claim 3, characterized in that: The bottom of the interception net bag (17) is fixedly installed with guide plates (16) at both ends.

5. A decentralized, low-consumption domestic sewage treatment system according to claim 4, characterized in that: A handle (23) is fixedly installed on the upper end face of the fixed frame (21).

6. A decentralized, low-consumption domestic sewage treatment system according to claim 5, characterized in that: The wastewater treatment enclosure (10) is equipped with a window protective cover (22) at the top opening position on the upper surface.

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