Sewage purification pretreatment device and sewage multi-stage purification system

Abstract

The utility model provides a sewage purification pretreatment device and a sewage multistage purification system, and relates to the technical field of sewage treatment.The sewage purification pretreatment device comprises a first treatment pond, a magnetic coagulation reaction pond and a clarification pond which are sequentially communicated, a sewage inlet is formed in one end of the first treatment pond, and a plurality of grids are arranged in the first treatment pond; a flocculating agent and magnetic powder are arranged in the magnetic coagulation reaction tank; a water outlet is formed in one end, far away from the magnetic coagulation reaction tank, of the clarification tank; sewage is filtered through a grid gathered in a first treatment tank, is mixed through a flocculating agent and magnetic powder in a magnetic coagulation reaction tank, and is settled through a clarification tank, so that purification pretreatment of the sewage is completed, organic matters and heavy metals are effectively removed, the subsequent process load is reduced, and the effluent quality of tail water is improved; the technical problems that an existing sewage purification system is lack of a pretreatment device, consequently, the sewage purification effect is poor, and the sewage treatment efficiency is low are solved, and the sewage treatment effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage purification, in particular to a sewage purification pretreatment device and a sewage multi-stage purification system. Background Art

[0002] Rainwater washes different catchment areas, increasing pollutants in the runoff and deteriorating water quality. The runoff contains a large amount of sediment and high concentrations of heavy metals. If the runoff is not treated or treated substandardly and seeps into the ground, it will lead to excessive levels of heavy metals and toxic chemicals in the soil, causing soil necrosis and groundwater pollution. The traditional road drainage system measurement is based on the removal of rainwater as soon as possible. However, untreated runoff rainwater is directly discharged into downstream water bodies, which will cause serious pollution to the water bodies. At the same time, the rapid formation of surface runoff by rainwater will cause serious waterlogging on the roads. Most of the reasons are runoff pollution caused by rainwater, especially after local areas of the city are flooded, a large amount of garbage mixed with sediment forms pollution in the rainwater. If it is directly discharged into the river, it will form more serious pollution. Therefore, it is necessary to purify the runoff sewage to ensure water quality.

[0003] At present, there are also sewage purification systems for urban surface runoff pollution, which generally include a multi-stage purification system with primary filtration interception channels, multi-stage plant filtration purification belts, ecological wooden revetments and underwater soft fences, etc., which can purify the runoff polluted water system through physical interception and ecological purification.

[0004] However, the existing sewage purification system lacks a pre-treatment device, resulting in poor sewage purification effect and low sewage treatment efficiency. Utility Model Content

[0005] The utility model aims to provide a sewage purification pretreatment device and a sewage multi-stage purification system to solve the technical problem that the existing sewage purification system lacks a pretreatment device, resulting in poor sewage purification effect and low sewage treatment efficiency.

[0006] In the first aspect, the utility model provides a sewage purification pretreatment device, comprising a first treatment tank, a magnetic coagulation reaction tank and a clarification tank connected in sequence:

[0007] A sewage inlet is provided at one end of the first treatment tank, the other end of the first treatment tank is connected to the magnetic coagulation reaction tank, and a plurality of grids are provided in the first treatment tank;

[0008] One end of the magnetic coagulation reaction tank away from the first treatment tank is connected to the clarification tank, and the magnetic coagulation reaction tank is provided with flocculants and magnetic powders;

[0009] The clarification tank is provided with a water outlet at one end away from the magnetic coagulation reaction tank;

[0010] The flocculation reaction tank is arranged between the magnetic coagulation reaction tank and the clarification tank. A plurality of baffles arranged in parallel are arranged in the flocculation reaction tank to form a serpentine passage in the flocculation reaction tank.

[0011] Furthermore, the sewage purification pretreatment device also includes a first dosing device, which is connected to the magnetic coagulation reaction tank, and the first dosing device is configured to add sodium hypochlorite into the magnetic coagulation reaction tank.

[0012] Furthermore, the sewage purification pretreatment device also includes a second dosing device, which is connected to the magnetic coagulation reaction tank, and the second dosing device is configured to add polyaluminium chloride into the magnetic coagulation reaction tank.

[0013] Furthermore, the sewage purification pretreatment device also includes a third dosing device, which is connected to the flocculation reaction tank and is configured to add polyacrylamide into the flocculation reaction tank.

[0014] Furthermore, the sewage purification pretreatment device also includes a magnetic separation device, one end of the magnetic separation device is connected to the bottom of the clarification tank, and the other end of the magnetic separation device is connected to the magnetic coagulation reaction tank, and the magnetic separation device is configured to separate wastewater and magnetic powder.

[0015] Another aspect of the utility model provides a sewage multi-stage purification system, including a composite artificial wetland, a facultative oxidation pond, an aerobic pond, an existing lake water ecological vegetation system and a plunge pool and the above-mentioned sewage purification pretreatment device;

[0016] The sewage purification pretreatment device is connected with the composite artificial wetland, the facultative oxidation pond, the aerobic pond and the existing lake water ecological vegetation system in sequence;

[0017] The existing lake water ecological vegetation system is stocked with water microorganisms and aquatic animals, and is planted with water plants.

[0018] Furthermore, the water plants include black algae, duckweed, wheel algae, bladderwort, pondweed, yellow calamus and Vallisneria, and the planting density of the water plants is 180 plants / m 3 .

[0019] Furthermore, the aquatic animals include large fish and insects, benthic animals, and carnivorous organisms.

[0020] Beneficial effects:

[0021] The utility model provides a sewage purification pretreatment device, comprising a first treatment tank, a magnetic coagulation reaction tank and a clarification tank which are connected in sequence: a sewage inlet is arranged at one end of the first treatment tank, the other end of the first treatment tank is connected with the magnetic coagulation reaction tank, and a plurality of grids are arranged in the first treatment tank; an end of the magnetic coagulation reaction tank away from the first treatment tank is connected with the clarification tank, and flocculants and magnetic powders are arranged on the magnetic coagulation reaction tank; an outlet is arranged at one end of the clarification tank away from the magnetic coagulation reaction tank; the sewage is filtered through the grid collected by the first treatment tank, and then the flocculants and magnetic powders in the magnetic coagulation reaction tank are mixed and set, and the sewage is precipitated in the clarification tank, so as to complete the purification pretreatment of the sewage, effectively remove organic matter and heavy metals, so as to reduce the subsequent process load and improve the water quality of tail water outlet, solve the technical problems that the existing sewage purification system lacks a pretreatment device, resulting in poor sewage purification effect and low sewage treatment efficiency, and improves the sewage treatment effect.

[0022] The utility model also provides a sewage multi-stage purification system, which has all the advantages of the above-mentioned sewage purification pretreatment system compared with the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of a sewage purification pretreatment system provided by an embodiment of the utility model;

[0025] Figure 2 A schematic diagram of the overall structure of a sewage purification pretreatment system provided by an embodiment of the utility model;

[0026] Figure 3 A schematic diagram of a multi-stage sewage purification system provided in an embodiment of the utility model.

[0027] Reference numerals:

[0028] 10. Sewage purification pretreatment device;

[0029] 100. first treatment tank; 110. grid;

[0030] 200, magnetic coagulation reaction tank; 210, first dosing device; 220, second dosing device;

[0031] 300. Clarifying tank;

[0032] 400, flocculation reaction tank; 410, third dosing device; 420, baffle;

[0033] 500. Magnetic separation device;

[0034] 20. Composite artificial wetland; 30. Facultative oxidation pond; 40. Aerobic pond; 50. Existing lake water ecological vegetation system; 60. Plunge pool. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0042] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a sewage purification pretreatment device, including a first treatment tank 100, a magnetic coagulation reaction tank 200 and a clarification tank 300 connected in sequence. A sewage inlet is provided at one end of the first treatment tank 100, and the other end of the first treatment tank 100 is connected to the magnetic coagulation reaction tank 200. A plurality of grids 110 are provided in the first treatment tank 100. The end of the magnetic coagulation reaction tank 200 away from the first treatment tank 100 is connected to the clarification tank 300, and flocculants and magnetic powder are provided on the magnetic coagulation reaction tank 200. A water outlet is provided at one end of the clarification tank 300 away from the magnetic coagulation reaction tank 200.

[0043] That is, the sewage purification pretreatment device provided by the utility model comprises a first treatment tank 100, a magnetic coagulation reaction tank 200 and a clarification tank 300 which are connected in sequence: a sewage inlet is arranged at one end of the first treatment tank 100, the other end of the first treatment tank 100 is connected to the magnetic coagulation reaction tank 200, and a plurality of grids 110 are arranged in the first treatment tank 100; an end of the magnetic coagulation reaction tank 200 away from the first treatment tank 100 is connected to the clarification tank 300, and a flocculant and magnetic powder are arranged on the magnetic coagulation reaction tank 200; and the clarification tank 300 is away from the magnetic coagulation reaction tank 200. A water outlet is provided at one end of the coagulation reaction tank 200; the sewage is filtered through the grid 110 collected by the first treatment tank 100, and then mixed with the flocculant and magnetic powder in the magnetic coagulation reaction tank 200, and precipitated through the clarification tank 300 to complete the purification pretreatment of the sewage, effectively remove organic matter and heavy metals, so as to reduce the subsequent process load and improve the water quality of the tail water outlet, solve the technical problems that the existing sewage purification system lacks a pretreatment device, resulting in poor sewage purification effect and low sewage treatment efficiency, and improves the sewage treatment effect.

[0044] Specifically, a sewage inlet is provided at one end of the first treatment tank 100, which is connected to the urban runoff pollution water system through a pipeline, so that sewage can enter the first treatment tank 100 from the sewage inlet. A plurality of evenly arranged grids 110 are provided in the first treatment tank 100, so that suspended solids and floating impurities with larger particle sizes in the sewage can be intercepted by the grids 110, providing a prerequisite for subsequent treatment. The other end of the first treatment tank 100 is connected to the magnetic coagulation reaction tank 200 through a pipeline, and the pollutants in the sewage are separated and converted by flocculants and magnetic powder. In this embodiment, the flocculant can be selected as polyaluminum chloride, and the magnetic powder can be selected as rare earth magnetic powder, and a stirring device is provided in the magnetic coagulation reaction tank 200, so that the pollutants in the sewage form flocs with the flocculant and the magnetic powder, and enter the clarification tank 300 with the sewage. The clarifier 300 may be configured as a hydraulic circulation clarifier 300, a suspension clarifier 300 or a pulse clarifier 300 to intercept flocs and discharge the treated sewage through an outlet for further purification.

[0045] Furthermore, the sewage purification pretreatment device also includes a first dosing device 210 , which is connected to the magnetic coagulation reaction tank 200 , and the first dosing device 210 is configured to add sodium hypochlorite into the magnetic coagulation reaction tank 200 .

[0046] Specifically, the first dosing device 210 is connected to the magnetic coagulation reaction tank 200 through a first dosing pipe, and the first dosing device 210 includes a storage tank and a quantitative delivery device, in which sodium hypochlorite is arranged, and the quantitative delivery device can deliver a preset amount of sodium hypochlorite to the magnetic coagulation reaction tank 200. Sodium hypochlorite has a good disinfection effect, and can effectively kill bacteria in sewage and decompose organic matter.

[0047] Furthermore, the sewage purification pretreatment device also includes a second dosing device 220 , which is connected to the magnetic coagulation reaction tank 200 , and the second dosing device 220 is configured to add polyaluminium chloride into the magnetic coagulation reaction tank 200 .

[0048] Specifically, the second dosing device 220 is connected to the magnetic coagulation reaction tank 200 through the second dosing pipe. The structure of the second dosing device 220 is the same as that of the first dosing device 210, and can deliver a preset amount of polyaluminum chloride to the magnetic coagulation reaction tank 200. Polyaluminum chloride is a commonly used flocculant with strong bridging adsorption performance, and can coagulate and adsorb pollutants in sewage to form flocs, so as to facilitate the separation of pollutants from sewage.

[0049] Furthermore, the sewage purification pretreatment device also includes a flocculation reaction tank 400, which is arranged between the magnetic coagulation reaction tank 200 and the clarification tank 300. The flocculation reaction tank 400 is provided with a plurality of parallel baffles 420 to form a serpentine passage in the flocculation reaction tank 400.

[0050] Specifically, the baffle 420 is arranged in parallel in the flocculation reaction tank 400 and is fixedly connected to the inner wall of the flocculation reaction tank 400, and its connection mode can be set to bolt connection. The baffle 420 is connected to one side of the inner wall of the flocculation reaction tank 400 in turn, and maintains a certain distance from the other side, thereby forming a serpentine passage in the flocculation reaction tank 400. By setting a serpentine passage in the flocculation reaction tank 400, the coagulation and adsorption time of sewage in the flocculation reaction tank 400 can be extended, thereby improving the flocculation effect of pollutants in the sewage, and further improving the sewage treatment effect.

[0051] Preferably, the sewage purification pretreatment device further includes a third dosing device 410 , the second dosing device 220 is connected to the flocculation reaction tank 400 , and the third dosing device 410 is configured to add polyacrylamide into the flocculation reaction tank 400 .

[0052] Specifically, the third dosing device 410 is connected to the flocculation reaction tank 400 through the third dosing pipe. The structure of the third dosing device 410 is the same as that of the first dosing device 210, and can deliver a preset amount of polyacrylamide to the magnetic coagulation reaction tank 200. Polyacrylamide is a linear high molecular polymer and an effective flocculant, which can further improve the flocculation effect of pollutants in the flocculation reaction tank 400 and further improve the sewage treatment effect.

[0053] Furthermore, the sewage purification pretreatment device also includes a magnetic separation device 500, one end of the magnetic separation device 500 is connected to the bottom of the clarification tank 300, and the other end of the magnetic separation device 500 is connected to the magnetic coagulation reaction tank 200. The magnetic separation device 500 is configured to separate wastewater and magnetic powder.

[0054] Specifically, one end of the magnetic separation device 500 is connected to the bottom of the clarification tank 300 through a pipeline, and the other end of the magnetic separation device 500 is connected to the magnetic coagulation reaction tank 200. A medium separator is provided in the magnetic separation device 500, which can separate the magnetic powder from the wastewater and transport the separated magnetic powder back to the magnetic coagulation reaction tank 200, so that the magnetic powder can be recycled, thereby reducing the overall cost of the sewage purification pretreatment system.

[0055] like Figure 3As shown, another aspect of the utility model provides a multi-stage sewage purification system, including a composite artificial wetland 20, a facultative oxidation pond 30, an aerobic pond 40, an existing lake water ecological vegetation system 50 and a plunge pool 60 and the above-mentioned sewage purification pretreatment device; the sewage purification pretreatment system 10 is connected with the composite artificial wetland 20, the facultative oxidation pond 30, the aerobic pond 40 and the existing lake water ecological vegetation system 50 in sequence; the existing lake water ecological vegetation system 50 is stocked with water microorganisms and aquatic animals, and is planted with water plants.

[0056] That is, the multi-stage sewage purification system provided by the utility model pre-treats the sewage through the sewage purification pre-treatment device 10, and purifies the sewage in sequence through the composite artificial wetland 20, the facultative oxidation pond 30, the aerobic pond 40, the existing lake water ecological vegetation system 50 and the waterfall pool 60, so as to completely treat the sewage harmlessly and achieve environmentally friendly discharge of sewage.

[0057] Furthermore, the water microorganisms include photosynthetic bacteria, bacillus, complex yeast, nitrifying bacteria, denitrifying bacteria and polyphosphate bacteria, and the dosage of water microorganisms is 60-120g / m 3 .

[0058] Specifically, in this embodiment, 60 g / m of photosynthetic bacteria were added to the water microorganisms. 3 , the yeast dosage is 80g / m 3 、The dosage of nitrifying bacteria is 100g / m 3 , the dosage of denitrifying bacteria is 90g / m 3 The dosage of polyphosphate bacteria is 100g / m 3 By adding an appropriate amount of water microorganisms to the existing lake water ecological vegetation system 50, pollutants in the water can be effectively reduced and indicators such as ammonia nitrogen in the polluted water can be improved.

[0059] Furthermore, the water plants include black algae, duckweed, wheel algae, bladderwort, pondweed, yellow iris and Vallisneria, and the planting density of water plants is 180 plants / m 3 .

[0060] Specifically, in this embodiment, the planting density of black algae, golden hornwort, wheel kelp, bladderwort and pondweed is 100 plants / m 3 The planting density of Iris calamus and Vallisneria sinensis is 180 plants / m 3 By adding an appropriate amount of water plants to the existing lake water ecological vegetation system 50, organic matter can be absorbed, making the water clearer and further improving the sewage purification effect. In other embodiments of the present application, the water plants can also be set as other types of submerged plants.

[0061] Furthermore, aquatic animals include large fish and insects, benthic animals, and carnivorous organisms.

[0062] Specifically, in this embodiment, the benthic animals are set as snails or frogs, and the carnivorous organisms are set as shrimps and fish. By adding a proper amount of aquatic animals to the current lake water ecological vegetation system 50, the ecological environment of the current lake water ecological vegetation system 50 can be further improved, providing convenience for observing the water quality of the water body after sewage treatment.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A sewage purification pretreatment device, characterized in that: The invention comprises a first treatment tank (100), a magnetic coagulation reaction tank (200) and a clarification tank (300) which are connected in sequence: A sewage inlet is provided at one end of the first treatment tank (100), the other end of the first treatment tank (100) is connected to the magnetic coagulation reaction tank (200), and a plurality of grids (110) are provided in the first treatment tank (100); One end of the magnetic coagulation reaction pool (200) away from the first treatment pool (100) is connected to the clarification pool (300), and a flocculant and magnetic powder are arranged on the magnetic coagulation reaction pool (200); The clarification tank (300) is provided with a water outlet at one end away from the magnetic coagulation reaction tank (200); The sewage purification pretreatment system also includes a flocculation reaction tank (400), which is arranged between the magnetic coagulation reaction tank (200) and the clarification tank (300). The flocculation reaction tank (400) is provided with a plurality of baffles (420) arranged in parallel to form a serpentine passage in the flocculation reaction tank (400).

2. The sewage purification pretreatment device according to claim 1, characterized in that: The sewage purification pretreatment system further comprises a first dosing device (210), the first dosing device (210) being connected to the magnetic coagulation reaction tank (200), and the first dosing device (210) being configured to add sodium hypochlorite into the magnetic coagulation reaction tank (200).

3. The sewage purification pretreatment device according to claim 1, characterized in that: The sewage purification pretreatment system further comprises a second dosing device (220), the second dosing device (220) being connected to the magnetic coagulation reaction tank (200), and the second dosing device (220) being configured to add polyaluminium chloride into the magnetic coagulation reaction tank (200).

4. The sewage purification pretreatment device according to claim 1, characterized in that: The sewage purification pretreatment system further comprises a third dosing device (410), wherein the third dosing device (410) is connected to the flocculation reaction tank (400), and the third dosing device (410) is configured to add polyacrylamide into the flocculation reaction tank (400).

5. The sewage purification pretreatment device according to claim 1, characterized in that: The sewage purification pretreatment system also includes a magnetic separation device (500), one end of the magnetic separation device (500) is connected to the bottom of the clarification tank (300), and the other end of the magnetic separation device (500) is connected to the magnetic coagulation reaction tank (200), and the magnetic separation device (500) is configured to separate wastewater and magnetic powder.

6. A multi-stage sewage purification system, characterized in that: It comprises a composite artificial wetland (20), a facultative oxidation pond (30), an aerobic pond (40), an existing lake water ecological vegetation system (50) and a plunge pool (60) and a sewage purification pretreatment device (10) as described in any one of claims 1 to 5; The sewage purification pretreatment device (10) is connected in sequence to the composite artificial wetland (20), the facultative oxidation pond (30), the aerobic pond (40), the existing lake water ecological vegetation system (50) and the plunge pool (60); The existing lake water ecological vegetation system (50) is stocked with water microorganisms and aquatic animals, and is planted with water plants.

7. The multi-stage sewage purification system according to claim 6, characterized in that: The water plants include black algae, duckweed, wheel algae, bladderwort, pondweed, yellow calamus and Vallisneria, and the planting density of the water plants is 180 plants / m 3 .

8. The multi-stage sewage purification system according to claim 6, characterized in that: The aquatic animals include fish, insects, benthic animals, and carnivorous organisms.

Images