Sewage purification system

Abstract

The invention discloses a sewage purification system which comprises a water storage tank, a group of partition plates are connected in the water storage tank, the interior of the water storage tank is divided into a first water collection area, two backflow areas, a purification area and a second water collection area through the partition plates, an adsorption box is arranged in the purification area and divides the purification area into two oxidation areas, a first water pump is arranged in the first water collection area, and a second water pump is arranged in the second water collection area. The first water pump is connected with a water distribution pipe through a pipeline; the water distribution pipe is arranged on the upper side of the adsorption box. The sewage treatment device has the advantages that anion pollutants and cation pollutants in sewage are adsorbed and gathered by the first adsorption area and the second adsorption area, nutrient substances gathered on the surface of the adsorption layer are absorbed by plants, the sewage is subjected to nitrogen and phosphorus removal through the biological anaerobic reaction layer, then aeration is performed through an aeration pipe in the oxidation area, and the sewage treatment effect is improved. Under the action of illumination, sewage is subjected to photocatalytic oxidation reaction on the photocatalytic oxidation layer, organic matters are degraded, and biological oxidation, COD degradation and nitrogen-containing compound oxidation are carried out on the biological contact oxidation layer.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater purification system. Background Technology

[0002] Urban wastewater treatment plant discharge systems exhibit significant complex pollution characteristics: First, daily treatment capacity generally reaches tens of thousands or even hundreds of thousands of tons, and with the acceleration of urbanization, the total amount of wastewater discharged continues to rise; second, although the overall concentration of organic pollutants from domestic sources is not high, their composition is complex and diverse; third, the enrichment of nitrogen and phosphorus nutrients is prominent, with influent ammonia nitrogen and total phosphorus concentrations often exceeding surface water environmental quality standards by tens of times, easily leading to eutrophication of receiving water bodies. Meanwhile, the industrial wastewater treatment sector faces even more severe challenges: in the effluent from industries such as fine chemicals and electronics manufacturing, the number of detectable recalcitrant organic pollutants such as polycyclic aromatic hydrocarbons, perfluorinated compounds, and antibiotics increases by more than 12% annually, with some characteristic pollutant concentrations exceeding micrograms per liter. Existing secondary treatment processes, with activated sludge as the core, generally achieve a removal rate of less than 40% for these substances, while advanced treatment units suffer from technical bottlenecks such as high operating costs and the generation of disinfection byproducts, making it difficult for effluent quality to meet the special limits of the "Discharge Standard of Pollutants for Urban Wastewater Treatment Plants" and the requirements of new local environmental regulations. This contradiction between treatment efficiency and emission standards is forcing the water treatment industry to innovate and upgrade its processes.

[0003] Traditional A2O processes often employ a series of anaerobic-anoxic-aerobic reaction tanks, which suffer from problems such as large footprint, complex sludge recirculation, and low removal efficiency for recalcitrant organic matter. While constructed wetland systems can purify water through the synergistic effect of plants and packing materials, they have drawbacks such as rapid adsorption saturation of the packing materials and insufficient oxidation capacity. Furthermore, in existing technologies, adsorption materials and oxidation modules are often located in different units, resulting in low system integration and high operating costs. For example, the system designed in CN11489061A has adsorption and oxidation modules located in different units, resulting in low system integration. Moreover, this system can only adsorb nitrogen and phosphorus pollutants, treating only a limited range of pollutants. Therefore, there is an urgent need to develop a highly efficient synergistic treatment system that integrates adsorption, absorption, and oxidation functions into a single reaction tank. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a wastewater purification system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A wastewater purification system includes a water storage tank. A set of partitions is connected inside the water storage tank, dividing the interior of the water storage tank into a first water collection area, two return areas, a purification area, and a second water collection area. An adsorption box is provided in the purification area, which divides the purification area into two oxidation areas. A first water pump is provided in the first water collection area, and the first water pump is connected to a water distribution pipe through a pipeline. The water distribution pipe is located on the upper side of the adsorption box.

[0006] Preferably, a second partition is connected inside the adsorption box, which divides the adsorption box into a first adsorption zone and a second adsorption zone. A collection pipe is provided at the bottom of the first adsorption zone, which is connected to the second adsorption zone. Wastewater in the first adsorption zone is discharged into the second adsorption zone through the collection pipe to achieve secondary adsorption.

[0007] Preferably, a second partition is connected inside the adsorption box. In the first adsorption zone and the second adsorption zone, a first filter layer, a biological anaerobic reaction layer, an adsorption layer and a plant absorption zone are arranged sequentially from bottom to top. The adsorption layer enables the adsorption and aggregation of anionic and cationic pollutants. The nutrients aggregated on the surface of the adsorption layer are absorbed by plants in the plant absorption zone. The wastewater is denitrified and dephosphorized by passing through the biological anaerobic reaction layer.

[0008] Preferably, notches are provided on both sides above the second adsorption zone, through which wastewater flows to the oxidation zone.

[0009] Preferably, the oxidation zone is provided with a second water filtration layer, a biological contact oxidation layer and a photocatalytic oxidation layer from bottom to top.

[0010] Preferably, a water collection pipe and an aeration pipe are provided at the bottom of each of the second filter layers. One end of the water collection pipe is connected to the second water collection area, and the other end of the water collection pipe is connected to the corresponding return area. The aeration pipe is used to aerate the oxidation area.

[0011] Preferably, each of the return zones is provided with a return pipe, the inlet of which is connected to a second water pump, and the outlet of which is located on the upper side of the first water collection zone. When the water quality is substandard, the water in the return zone is returned to the first water collection zone for re-purification through the return pipe.

[0012] Preferably, an inlet pipe and an outlet pipe are connected to the outside of the water storage tank. The inlet pipe is connected to the first water collection area, and the outlet pipe is connected to the second water collection area. Wastewater is transported to the first water collection area through the inlet pipe, and the purified wastewater is discharged from the outlet pipe.

[0013] Preferably, a set of solar lamps is connected to both sides of the adsorption box, with the light from the solar lamps directed toward the corresponding oxidation zone. Through the action of light, the wastewater undergoes a photocatalytic oxidation reaction in the photocatalytic oxidation layer, and the organic matter is degraded.

[0014] The advantages of this invention are as follows: The wastewater purification system provided by this invention adsorbs and aggregates anionic and cationic pollutants in wastewater through a first adsorption zone and a second adsorption zone. Nutrients aggregated on the surface of the adsorption layer are absorbed by plants in the plant absorption zone. Wastewater undergoes denitrification and phosphorus removal through a biological anaerobic reaction layer, and then is aerated through an aeration pipe in the oxidation zone. Under the action of light, the wastewater undergoes photocatalytic oxidation in the photocatalytic oxidation layer, where organic matter is degraded. Biological oxidation occurs in the biological contact oxidation layer, where COD is degraded and nitrogen-containing compounds are oxidized. The wastewater after the reaction flows through a collection pipe in the oxidation zone to a return zone and a second collection zone. When the water quality is not up to standard, the wastewater is returned to the first collection zone through a return pipe in the return zone. After purification, the wastewater is discharged from the outlet pipe in the second collection zone in compliance with standards. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the principle structure of a wastewater purification system provided by the present invention; Figure 2 This is a cross-sectional view of the water storage tank; Figure 3 This is a top view of the water storage tank. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0018] like Figure 1As shown, the present invention provides a wastewater purification system, including a water storage tank 1, which is an open-top box. A set of first partitions 2 are connected inside the water storage tank 1, which divide the interior of the water storage tank 1 into a first water collection area 3, two return areas 4, a purification area, and a second water collection area 5. The first water collection area 3 is located in the middle of the two return areas 4, and the purification area is located in the middle of the first water collection area 3 and the second water collection area 5.

[0019] An inlet pipe 1.1 and an outlet pipe 1.2 are connected to the outside of the water storage tank 1. The inlet pipe is connected to the first water collection area 3, and the outlet pipe 1.2 is connected to the second water collection area 5. Sewage is transported into the first water collection area 3 through the inlet pipe 1.1, and the purified sewage enters the second water collection area 5 and is then discharged through the outlet pipe 1.2.

[0020] An adsorption box 6 is provided in the purification area, which divides the purification area into two oxidation zones 7. A first water pump 9 is provided in the first water collection zone 3. The first water pump 9 is connected to a water distribution pipe 8 through a pipe. The water distribution pipe 8 is located on the upper side of the adsorption box 6. The first water pump 9 transports the sewage in the first water collection zone 3 into the adsorption box 6.

[0021] like Figure 3 As shown, a second partition 6.1 is connected inside the adsorption box 6, which divides the adsorption box 6 into a first adsorption zone 6.2 and a second adsorption zone 6.3. A collection pipe 6.4 is provided at the bottom of the first adsorption zone 6.2, which is connected to the second adsorption zone 6.3. Water inlet holes are evenly distributed on the collection pipe 6.4, so that the sewage in the first adsorption zone 6.2 enters the collection pipe 6.4 through the water inlet holes and is then transported into the second adsorption zone 6.3 through the collection pipe 6.4.

[0022] like Figure 2 As shown, from bottom to top, a first water filter layer 6.5, a biological anaerobic reaction layer 6.6, an adsorption layer 6.7, and a plant absorption zone 6.8 are sequentially arranged in the first adsorption zone 6.2 and the second adsorption zone 6.3. In this embodiment, the filler material of the first water filter layer 6.5 is crushed stone, gravel, coarse sand, and pebbles; the filler material of the biological anaerobic reaction layer 6.6 is plastic three-dimensional hollow filler, ceramsite, and zeolite, containing denitrifying bacteria, Stellaria media, Fibroblastobacterium fluorescens, and denitrifying bacteria; and the filler material of the adsorption layer 6.7 is limestone, modified ceramsite, and zeolite.

[0023] After the wastewater enters the first adsorption zone 6.2, anionic and cationic pollutants are adsorbed and aggregated at the adsorption layer 6.7. Common anionic pollutants include nitrates and phosphates, and common cationic pollutants include ammonia nitrogen. The nutrients aggregated on the surface of the adsorption layer are absorbed by plants in the plant absorption zone 6.8. The wastewater undergoes nitrogen and phosphorus removal in the biological anaerobic reaction layer 6.6, and then flows to the second adsorption zone 6.3 through the collection pipe 6.4. It then passes through the first filter layer 6.5, the biological anaerobic reaction layer 6.6, and the adsorption layer 6.7 again, and is finally absorbed by the plants.

[0024] A notch 6.9 is provided on both sides above the second adsorption zone 6.3. The two notches 6.9 are symmetrically arranged, and the wastewater in the second adsorption zone 6.3 flows to the oxidation zone 7 through the notch 6.9.

[0025] like Figure 2 As shown, the oxidation zone 7 is provided with a second water filter layer 7.1, a biological contact oxidation layer 7.2, and a photocatalytic oxidation layer 7.3 from bottom to top. In this embodiment, the filler of the second water filter layer 7.1 is crushed stone, gravel, coarse sand, and pebbles. The filler of the biological contact oxidation layer 7.2 includes plastic three-dimensional hollow filler, ceramsite, and zeolite, and is covered with nitrifying bacteria such as nitrite bacteria and nitrate bacteria. The filler of the photocatalytic oxidation layer 7.3 includes modified ceramsite and modified zeolite.

[0026] At the bottom of each of the second filter layers, there is a water collection pipe 7.4 and an aeration pipe 7.5. Aeration is carried out through the aeration pipe 7.5, which is an existing device. One end of the water collection pipe 7.4 is connected to the second water collection area 5, and the other end of the water collection pipe 7.4 is connected to the corresponding return area 4. Water inlet holes are evenly distributed on the water collection pipe 7.4 so that water in the oxidation area 7 can enter the water collection pipe 7.4 and then be transported into the return area 4 and the second water collection area 5.

[0027] Each of the return zones 4 is equipped with a return pipe 4.1. The inlet of the return pipe 4.1 is connected to the second water pump, and the outlet of the return pipe 4.1 is located on the upper side of the first water collection zone 3. When the water quality fails the test, the water in the return zone 4 is transported back to the first water collection zone 3 through the return pipe 4.1 for re-purification.

[0028] A set of solar lamps 10 are connected to both sides of the adsorption box 6. The light direction of the solar lamps 10 is towards the corresponding oxidation zone 7. The solar lamps 10 are existing equipment, including a bracket, on which a solar panel and a lamp are connected. A battery is attached to the back of the solar panel to supply power to the lamp and electrical equipment.

[0029] Under the illumination of solar lamps, wastewater undergoes photocatalytic oxidation in the photocatalytic oxidation layer 7.3, where organic matter is degraded. In the biological contact oxidation layer 7.2, bio-oxidation occurs, resulting in COD degradation and oxidation of nitrogen-containing compounds.

[0030] Working principle: Wastewater enters the first collection zone 3 through the inlet pipe 1.1. Then, the water pump 9 draws the wastewater from the first collection zone 3 and discharges it into the first adsorption zone 6.2. At the adsorption layer 6.7, anionic and cationic pollutants are adsorbed and aggregated. Nutrients aggregated on the surface of the adsorption layer are absorbed by plants in the plant absorption zone 6.8. The wastewater undergoes nitrogen and phosphorus removal in the biological anaerobic reaction layer 6.6, and then flows through the collection pipe 6.4 to the second adsorption zone 6.3. It then passes through the first filter layer 6.5, the biological anaerobic reaction layer 6.6, and the adsorption layer 6.7 again, and is finally absorbed by plants in the second adsorption zone 6.3. Wastewater overflows from the oxidation zone 7 through the notch 6.9 and is aerated by the aeration pipe 7.5. Under the illumination of the solar lamp 10, the wastewater undergoes photocatalytic oxidation in the photocatalytic oxidation layer 7.3, where organic matter is degraded. In the biological contact oxidation layer 7.2, biological oxidation occurs, COD is degraded, and nitrogen-containing compounds are oxidized. The purified wastewater is transported into the return zone 4 and the second collection zone 5 through the collection pipe 7.4. If the water quality is not up to standard, the water is returned to the first collection zone 3 through the return pipe 4.1. By controlling the return ratio, the purified wastewater is discharged from the outlet pipe 1.2 in the second collection zone 5 in compliance with standards.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wastewater purification system, characterized in that: Includes a water storage tank (1), with a set of first partitions (2) connected inside the water storage tank (1). The set of first partitions (2) divides the interior of the water storage tank (1) into a first water collection area (3), two return areas (4), a purification area, and a second water collection area (5). An adsorption box (6) is provided in the purification area, which divides the purification area into two oxidation areas (7). A first water pump (9) is provided in the first water collection area (3), and the first water pump (9) is connected to a water distribution pipe (8) through a pipeline. The water distribution pipe (8) is located on the upper side of the adsorption box (6).

2. The wastewater purification system according to claim 1, characterized in that: A second partition (6.1) is connected inside the adsorption box (6). The second partition (6.1) divides the adsorption box (6) into a first adsorption zone (6.2) and a second adsorption zone (6.3). A collection tube (6.4) is provided at the bottom of the first adsorption zone (6.2), and the collection tube (6.4) is connected to the second adsorption zone (6.3).

3. The wastewater purification system according to claim 2, characterized in that: In the first adsorption zone (6.2) and the second adsorption zone (6.3), from bottom to top, there are a first water filter layer (6.5), a biological anaerobic reaction layer (6.6), an adsorption layer (6.7) and a plant absorption zone (6.8).

4. A wastewater purification system according to claim 2, characterized in that: Notch grooves (6.9) are provided on both sides above the second adsorption zone (6.3).

5. A wastewater purification system according to claim 1, characterized in that: Within the oxidation zone (7), a second water filtration layer (7.1), a biological contact oxidation layer (7.2), and a photocatalytic oxidation layer (7.3) are arranged sequentially from bottom to top.

6. A wastewater purification system according to claim 5, characterized in that: At the bottom of each second filter layer, there is a water collection pipe (7.4) and an aeration pipe (7.5). One end of the water collection pipe (7.4) is connected to the second water collection area (5), and the other end of the water collection pipe (7.4) is connected to the corresponding return area (4).

7. A wastewater purification system according to claim 1, characterized in that: Each of the recirculation zones (4) is provided with a recirculation pipe (4.1), the inlet of the recirculation pipe (4.1) is connected to the second water pump, and the outlet of the recirculation pipe (4.1) is located on the upper side of the first water collection zone (3).

8. A wastewater purification system according to claim 1, characterized in that: An inlet pipe (1.1) and an outlet pipe (1.2) are connected to the outside of the water storage tank (1). The inlet pipe is connected to the first water collection area (3), and the outlet pipe (1.2) is connected to the second water collection area (5).

9. A wastewater purification system according to claim 1, characterized in that: A set of solar lamps (10) are connected to both sides of the adsorption box (6), and the light direction of the solar lamps (10) is towards the corresponding oxidation zone (7).

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