Composite sewage treatment system

Abstract

The utility model provides a composite sewage treatment system, which relates to the technical field of sewage treatment and comprises an air floatation tank, a water inlet assembly, a pressure dissolved air tank, an upper-layer inclined plate assembly and a slag scraper, a sludge discharge hopper is arranged at the bottom of the air floatation tank, the slag scraper is arranged at the top of the air floatation tank, and the water inlet assembly comprises a water inlet pipe and a plurality of water distribution ports. The water inlet pipe is connected with the pressure dissolved air tank, the upper-layer inclined plate assembly and the plurality of water distribution ports are arranged in the air floatation tank, the water distribution ports are arranged at the bottom of the upper-layer inclined plate assembly, the upper-layer inclined plate assembly is provided with a plurality of inclined plates, and the adjacent water distribution ports are arranged at intervals of at least two groups of inclined plates. The air flotation area and the inclined plate sedimentation area are integrated in the same tank body or tank body, so that sewage is subjected to air flotation and sedimentation treatment in the same tank body, an intensive system with high-density solid-liquid separation and impact load resistance is realized, and the problem that the occupied area is increased due to the fact that traditional air flotation and sedimentation units are separately arranged is solved.

Description

Technical Field

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

[0002] The traditional air flotation-sedimentation combined process has the following technical defects: 1) Turbulent hydraulic flow: the air flotation effluent directly enters the horizontal flow sedimentation tank, which easily causes short-circuiting, resulting in a decrease in sedimentation efficiency of up to 30%-40%; 2) Low space utilization: the air flotation and sedimentation units are arranged separately, which increases the floor space by more than 50%; In order to address the above defects, this application is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a composite wastewater treatment system that combines inclined plate sedimentation and air flotation processes to achieve a high-density solid-liquid separation intensive system.

[0004] To address the aforementioned problems, this utility model provides a composite wastewater treatment system, comprising a flotation tank, an inlet assembly, a pressure dissolved air tank, an upper inclined plate assembly, and a sludge scraper. The flotation tank has a sludge discharge hopper at its bottom, and the sludge scraper is positioned at the top of the flotation tank. The inlet assembly includes an inlet pipe and several water distribution outlets, with the inlet pipe connected to the pressure dissolved air tank. The upper inclined plate assembly and several water distribution outlets are disposed within the flotation tank. The water distribution outlets are located at the bottom of the upper inclined plate assembly, which has several inclined plates, with adjacent water distribution outlets spaced at least two sets of inclined plates apart.

[0005] According to one embodiment of the present invention, the composite sewage treatment system further includes a slag discharge tank, into which the impurities scraped off by the slag scraper enter.

[0006] According to one embodiment of the present invention, the inclination angle of the inclined plate in the upper inclined plate assembly is 50°~58°.

[0007] According to one embodiment of the present invention, at least some of the inclined plates in the upper inclined plate assembly are provided with eddy current suppression grids to suppress the generation of eddy currents.

[0008] According to one embodiment of the present invention, the aperture of the eddy current suppression grid is 5~8mm, and the opening ratio is 35%~45%.

[0009] According to one embodiment of the present invention, the flotation tank is connected to the effluent assembly, which may be a water collection pipe or an overflow outlet, etc.

[0010] According to one embodiment of the present invention, the composite wastewater treatment system further includes a laser particle size analyzer for monitoring the SS concentration (suspended solids concentration) of wastewater. One or more sets of laser particle size analyzers can be set.

[0011] According to one embodiment of the present invention, the laser particle size analyzer is electrically connected to the pressure dissolved gas tank and the slag scraper.

[0012] According to one embodiment of the present invention, a lower inclined plate assembly is provided on the lower side of the water distribution port.

[0013] According to one embodiment of the present invention, a rotating water distributor is provided at the water distribution port to switch water distribution between the lower inclined plate assembly and the upper inclined plate assembly.

[0014] The beneficial effects of this utility model are that by integrating the flotation zone and the inclined plate sedimentation zone into the same tank or pool, the wastewater can complete flotation and sedimentation treatment in the same pool. The inclined plate assembly avoids the problem of short-circuiting that is easy to occur when the effluent from the traditional flotation directly enters the horizontal flow sedimentation tank. While ensuring sedimentation efficiency, it realizes a high-density solid-liquid separation and shock load resistant intensive system, solving the problem of increased floor space caused by the separate arrangement of traditional flotation and sedimentation units. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the combined wastewater treatment system in Example 1;

[0017] Figure 2 This is a structural diagram of the inlet assembly, the upper inclined plate assembly, and the outlet assembly.

[0018] Figure 3 This is a schematic diagram of the combined wastewater treatment system in Example 2. Detailed Implementation

[0019] The following description is only intended to disclose the present invention so that those skilled in the art can implement it. The embodiments in the following description are merely examples, and those skilled in the art will conceive of other obvious modifications. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0020] Example 1:

[0021] A composite wastewater treatment system, such as Figure 1 It includes an air flotation tank 1, an inlet water assembly 7, a pressure dissolved air tank 2, an upper inclined plate assembly 3, and a sludge scraper 4.

[0022] The bottom of the flotation tank 1 is equipped with a sludge discharge hopper 6, and the top is equipped with a sludge scraper 4 and a sludge discharge trough 5. The impurities scraped off by the sludge scraper 4 enter the sludge discharge trough 5.

[0023] The water inlet assembly 7 includes an inlet pipe 72 and several water distribution ports 71. The water distribution ports 71 are installed in the flotation tank 1. The inlet pipe 72 is connected to the pressure dissolved air tank 2. The pressure dissolved air tank 2 allows air to be dissolved in the water, which, together with the micro-nano bubble generator, forms tiny bubbles. Wastewater enters the flotation tank 1 through the inlet pipe 72 and the water distribution ports 71.

[0024] The upper inclined plate assembly 3 is installed in the flotation tank 1, and the water distribution port 71 is located at the bottom of the upper inclined plate assembly 3. The upper inclined plate assembly 3 is provided with several inclined plates, and adjacent water distribution ports 71 are arranged with at least two sets of inclined plates spaced apart. Figure 1 After being discharged from the water distribution port 71, the sewage moves upward to the top of the inclined plate and then downward. The inclined plates in the upper inclined plate assembly 3 preferably have an inclination angle of 50° to 58° and a plate spacing of 50mm.

[0025] The dissolved air flotation tank 1 is connected to the effluent assembly 8, which can be a water collection pipe or an overflow outlet, etc. Figure 2 In this embodiment, the water outlet component 8 is in the form of a water collection pipe.

[0026] Example 2:

[0027] Based on Example 1, such as Figure 3 In this embodiment, a lower inclined plate assembly 10 is added. The upper inclined plate is for upward flow and the lower inclined plate is for downward flow, which further improves the sewage treatment efficiency. Specifically, a lower inclined plate assembly 10 is provided below the water distribution port 71. The lower inclined plate assembly 10 includes several inclined plates. The inclination angle of the inclined plates can be selected from 58° to 65°. The plate spacing can be larger than the plate spacing between the upper inclined plate assemblies 3. A rotating water distributor is provided at the water distribution port 71 to circulate and switch water distribution between the lower inclined plate assembly 10 and the upper inclined plate assembly 3. The circulation cycle is preferably 10 to 20 minutes. The alternating inclined plate sedimentation and air flotation process of the upper and lower water layers work together to further improve the sewage treatment efficiency.

[0028] Example 3:

[0029] Based on Example 1 or 2, this example adds a laser particle size analyzer 11 to monitor the SS concentration (suspended solids concentration) of wastewater. One or more sets of laser particle size analyzers 11 can be set. The laser particle size analyzer 11 can detect wastewater in the flotation tank 1 or at the effluent assembly 8. The laser particle size analyzer 11 is electrically connected to the pressure dissolved air tank 2 and the sludge scraper 4 to realize dynamic optimization of operating parameters. When the suspended solids concentration reaches the set value, the dissolved air pressure of the pressure dissolved air tank 2 and the sludge scraping frequency of the sludge scraper 4 are increased.

[0030] Example 4:

[0031] Based on any of the above embodiments, in this embodiment, an eddy current suppression grid 9 is added. At least some of the inclined plates in the upper inclined plate assembly 3 are provided with an eddy current suppression grid 9 to suppress the generation of eddy currents. The aperture of the eddy current suppression grid 9 is 5~8mm and the opening ratio is 35%~45%.

[0032] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. A composite wastewater treatment system, characterized in that: The system includes a flotation tank (1), an inlet assembly (7), a pressure dissolved air tank (2), an upper inclined plate assembly (3), and a sludge scraper (4). The flotation tank (1) is equipped with a sludge discharge hopper (6) at the bottom. The sludge scraper (4) is located at the top of the flotation tank (1). The inlet assembly (7) includes an inlet pipe (72) and several water distribution ports (71). The inlet pipe (72) is connected to the pressure dissolved air tank (2). The upper inclined plate assembly (3) and several water distribution ports (71) are located in the flotation tank (1). The water distribution ports (71) are located at the bottom of the upper inclined plate assembly (3). The upper inclined plate assembly (3) is equipped with several inclined plates. Adjacent water distribution ports (71) are spaced at least two sets of inclined plates apart.

2. The composite wastewater treatment system according to claim 1, characterized in that: The composite wastewater treatment system also includes a slag discharge tank (5), into which the impurities scraped off by the slag scraper (4) enter.

3. The composite wastewater treatment system according to claim 1, characterized in that: The inclined plate in the upper inclined plate assembly (3) has an inclination angle of 50°~58°.

4. The composite wastewater treatment system according to claim 1, characterized in that: At least some of the inclined plates in the upper inclined plate assembly (3) are provided with eddy current suppression grids (9).

5. The composite wastewater treatment system according to claim 4, characterized in that: The vortex suppression grid (9) has a pore size of 5~8mm and an opening ratio of 35%~45%.

6. The composite wastewater treatment system according to any one of claims 1-5, characterized in that: The flotation tank (1) is connected to the effluent assembly (8).

7. The composite wastewater treatment system according to claim 6, characterized in that: The composite wastewater treatment system also includes a laser particle size analyzer (11).

8. The composite wastewater treatment system according to claim 7, characterized in that: The laser particle size analyzer (11) is electrically connected to the pressure dissolved gas tank (2) and the slag scraper (4).

9. The composite wastewater treatment system according to any one of claims 1-5, characterized in that: A lower inclined plate assembly (10) is provided on the lower side of the water inlet (71).

10. The composite wastewater treatment system according to claim 9, characterized in that: A rotating water distributor is provided at the water inlet (71).

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