Sewage treatment assembly

Abstract

The utility model discloses a sewage treatment assembly which comprises a Fenton pond, a middle pond, a secondary sedimentation pond, an acid storage tank, a salt storage tank, a hydrogen peroxide storage tank and a mixer, the salt storage tank is used for containing a ferrous sulfate solution, wastewater treated by the secondary sedimentation pond is discharged into the middle pond, the acid storage tank is communicated with the middle pond, and a first valve is arranged at the communication position of the acid storage tank and the middle pond. A water outlet of the middle tank and a liquid outlet of the salt storage tank are communicated with the interior of the Fenton tank through a mixer, a second valve is arranged at the communication position of the middle tank and the mixer, a third valve is arranged at the communication position of the liquid outlet of the salt storage tank and the mixer, the hydrogen peroxide storage tank is communicated with the interior of the Fenton tank, and a fourth valve is arranged at the communication position; therefore, the sewage entering the Fenton tank can be acidified in advance, and the ferrous ions are added, so that the utilization efficiency of the hydrogen peroxide and the ferrous ions can be remarkably improved.

Description

Technical Field

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

[0002] The Fenton tank is used to treat COD which is more difficult to treat in the sewage treatment process. Sulfuric acid needs to be added to the Fenton tank to adjust the pH of the sewage to about 3, and ferrous sulfate and hydrogen peroxide are added for redox reaction to decompose the more difficult to treat COD components in the sewage. However, sulfuric acid, ferrous sulfate and hydrogen peroxide are currently added in the Fenton tank, which leads to uneven mixing of sulfuric acid, ferrous sulfate and hydrogen peroxide in the Fenton tank, especially in some local areas where the pH adjustment is not in place, resulting in waste of ferrous sulfate and hydrogen peroxide (for example, part of the hydrogen peroxide will be directly reduced to produce oxygen, while part of the ferrous sulfate will be directly oxidized to ferric sulfate. This part of hydrogen peroxide and ferrous sulfate will not separate COD, thus causing waste). Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a sewage treatment assembly with a simple structure, which can acidify the sewage entering the Fenton tank in advance and mix it with ferrous ions before entering the Fenton tank.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a sewage treatment assembly, comprising a Fenton tank, an intermediate tank, a secondary sedimentation tank, an acid storage tank, a salt storage tank, a hydrogen peroxide storage tank and a mixer, wherein the salt storage tank is used to contain a ferrous sulfate solution, and the wastewater treated in the secondary sedimentation tank is discharged into the intermediate tank, the acid storage tank is connected to the intermediate tank and a first valve is arranged at the connection point, the water outlet of the intermediate tank and the liquid outlet of the salt storage tank are connected to the Fenton tank through the mixer, a second valve is arranged at the connection point between the intermediate tank and the mixer, a third valve is arranged at the connection point between the liquid outlet of the salt storage tank and the mixer, and the hydrogen peroxide storage tank is connected to the Fenton tank and a fourth valve is arranged at the connection point.

[0005] The beneficial effect of the above technical solution is that: in this way, the sewage in the secondary sedimentation tank can be discharged into the intermediate tank in advance, and then sulfuric acid is added to the intermediate tank to adjust the pH of the sewage to about 3 in advance, and then it is discharged into the Fenton tank, and ferrous sulfate is added through a mixer during the discharge into the Fenton tank, so that the pH value of the sewage entering the Fenton tank has been adjusted in advance and the ferrous ions are mixed, so that when hydrogen peroxide is added to the Fenton tank, the hydrogen peroxide and the ferrous ions can undergo oxidation-reduction reactions under corresponding pH conditions to decompose COD, which can significantly improve the utilization efficiency of hydrogen peroxide and ferrous ions.

[0006] The above technical solution also includes a first water pump, which is arranged between the mixer and the connecting point of the Fenton tank, and is used to pump the wastewater in the intermediate tank into the Fenton tank.

[0007] The beneficial effect of the above technical solution is that the power of the first water pump can be increased to transport the sewage in the intermediate tank to the Fenton tank.

[0008] The mixer described in the above technical solution is a Venturi jet mixer.

[0009] The beneficial effect of the above technical solution is that the ferrous sulfate solution and sewage are mixed well.

[0010] The addition point of hydrogen peroxide in the Fenton pool in the above technical solution is close to the water inlet of the Fenton pool.

[0011] The beneficial effect of the above technical solution is that the utilization efficiency of hydrogen peroxide and ferrous ions can be further improved.

[0012] In the above technical solution, a partition is arranged in the intermediate tank, and the partition divides the intermediate tank into a first intermediate tank and a second intermediate tank, and the upper end of the partition is lower than the height of the intermediate tank mouth, the wastewater treated in the second sedimentation tank is discharged into the first intermediate tank, and the wastewater in the first intermediate tank overflows into the second intermediate tank through the top of the partition, the acid storage tank is connected with the second intermediate tank, and the second intermediate tank is provided with a water outlet and constitutes the water outlet of the intermediate tank.

[0013] The beneficial effect of the above technical solution is that it reduces the construction cost of the intermediate tank and enables the sewage discharged from the secondary sedimentation tank to be buffered in the first intermediate tank first and then overflow to the second intermediate tank for acid treatment.

[0014] The horizontal height difference between the upper end of the partition and the upper end of the intermediate pool in the above technical solution is not less than 0.5m.

[0015] The beneficial effect of the above technical solution is that it can prevent the first intermediate pool from overflowing due to a large water flow.

[0016] The above technical solution also includes a second water pump, the water inlet of the second water pump is connected to the first intermediate pool, the water outlet of the second water pump is also connected to the Fenton pool and a fifth valve is provided at the connection point.

[0017] The beneficial effect of the above technical solution is that when the water inflow into the first intermediate tank is too large and the water levels of the first intermediate tank and the second intermediate tank are equal, the second water pump can be activated to accelerate the supply of sewage in the intermediate tank to the Fenton tank.

[0018] In the above technical solution, the water outlet of the second water pump is also connected to the regulating tank and a sixth valve is provided at the connection point.

[0019] The beneficial effect of the above technical solution is that the sewage in the first intermediate tank can be pumped into the regulating tank through the second water pump, so that the water quality of the sewage in the regulating tank can be adjusted.

[0020] In the above technical solution, the water outlet of the second water pump is also connected to the acidification tank and a seventh valve is provided at the connection point.

[0021] The beneficial effect of the above technical solution is that the sewage in the first intermediate tank can be pumped into the acidification tank through the second water pump, so that the water quality of the sewage in the acidification tank can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the sewage treatment assembly described in Example 1 of the utility model;

[0023] Figure 2 This is a schematic structural diagram of the sewage treatment assembly described in Example 2 of the utility model.

[0024] In the figure: 1. Fenton tank; 2. Intermediate tank; 3. Second sedimentation tank; 4. Acid storage tank; 5. Seventh valve; 6. Salt storage tank; 7. Hydrogen peroxide storage tank; 8. Mixer; 9. First valve; 10. Second valve; 11. Third valve; 12. Fourth valve; 13. First water pump; 21. Partition; 2a. First intermediate tank; 2b. Second intermediate tank; 14. Second water pump; 15. Fifth valve; 16. Regulating tank; 17. Sixth valve; 18. Acidification tank; 19. Eighth valve. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0026] Example 1

[0027] like Figure 1As shown, this embodiment provides a sewage treatment assembly, including a Fenton tank 1, an intermediate tank 2, a secondary sedimentation tank 3, an acid storage tank 4, a salt storage tank 6, a hydrogen peroxide storage tank 7 and a mixer 8, wherein the salt storage tank 6 is used to contain a ferrous sulfate solution, and the wastewater treated in the secondary sedimentation tank 3 is discharged into the intermediate tank 2, the acid storage tank 4 is connected to the intermediate tank 2 and a first valve 9 is provided at the connection, the water outlet of the intermediate tank 2 and the liquid outlet of the salt storage tank 6 are connected to the Fenton tank 1 through the mixer 8, a second valve 10 is provided at the connection between the intermediate tank 2 and the mixer 8, a third valve 11 is provided at the connection between the liquid outlet of the salt storage tank 6 and the mixer 8, and the The hydrogen peroxide storage tank 7 is connected to the Fenton tank 1 and a fourth valve 12 is provided at the connection point, so that the sewage in the secondary sedimentation tank can be discharged into the intermediate tank in advance, and then sulfuric acid is added to the intermediate tank to adjust the pH of the sewage to about 3 in advance, and then discharged into the Fenton tank, and ferrous sulfate is added through a mixer during the discharge into the Fenton tank, so that the pH value of the sewage entering the Fenton tank has been adjusted in advance and the ferrous ions are mixed, so that when hydrogen peroxide is added to the Fenton tank, the hydrogen peroxide and the ferrous ions can undergo oxidation-reduction reactions under corresponding pH conditions to decompose COD, which can significantly improve the utilization efficiency of hydrogen peroxide and ferrous ions.

[0028] The above technical solution also includes a first water pump 13, which is arranged between the mixer 8 and the connecting point of the Fenton tank 1. The first water pump 13 is used to pump the wastewater in the intermediate tank 2 into the Fenton tank 1. In this way, the first water pump can increase the power to transport the sewage in the intermediate tank to the Fenton tank.

[0029] The mixer 8 in the above technical solution is a Venturi jet mixer, which can achieve a good mixing effect between the ferrous sulfate solution and the sewage.

[0030] In the above technical solution, the adding point of hydrogen peroxide in the Fenton tank 1 is close to the water inlet of the Fenton tank 1, which can further improve the utilization efficiency of hydrogen peroxide and ferrous ions.

[0031] Example 2

[0032] like Figure 2As shown, the same as Example 1, the difference is that a partition 21 is arranged in the intermediate tank 2, the partition 21 divides the intermediate tank 2 into a first intermediate tank 2a and a second intermediate tank 2b, and the upper end of the partition 21 is lower than the height of the tank mouth of the intermediate tank 2, the wastewater treated in the secondary sedimentation tank 3 is discharged into the first intermediate tank 2a, the wastewater in the first intermediate tank 2a overflows into the second intermediate tank 2b through the top of the partition 21, the acid storage tank 4 is connected with the second intermediate tank 2b, the second intermediate tank 2b is provided with an outlet and constitutes the outlet of the intermediate tank 2, so that the construction cost of the intermediate tank is low, and the sewage discharged from the secondary sedimentation tank can be first buffered in the first intermediate tank, and then overflow to the second intermediate tank for acid treatment.

[0033] In the above technical solution, the height difference between the upper end of the partition 21 and the upper end of the intermediate pool 2 is not less than 0.5 m, so as to avoid overflowing of the first intermediate pool due to large water flow.

[0034] The above technical solution also includes a second water pump 14, the water inlet of the second water pump 14 is connected to the first intermediate pool 2a, the water outlet of the second water pump 14 is also connected to the Fenton pool 1 and a fifth valve 15 is provided at the connection point, so that when the water inflow into the first intermediate pool is too large and the water levels of the first intermediate pool and the second intermediate pool are equal, the second water pump is activated to accelerate the supply of sewage in the intermediate pool to the Fenton pool, and the water inlet of the second water pump 14 is also provided with an eighth valve 19.

[0035] In the above technical solution, the water outlet of the second water pump 14 is also connected to the regulating tank 16 and a sixth valve 17 is provided at the connection point, so that the sewage in the first intermediate tank can be pumped into the regulating tank through the second water pump, thereby adjusting the water quality of the sewage in the regulating tank.

[0036] In the above technical solution, the water outlet of the second water pump 14 is also connected to the acidification tank 18 and a seventh valve 5 is provided at the connection point, so that the sewage in the first intermediate tank can be pumped into the acidification tank through the second water pump, thereby adjusting the water quality of the sewage in the acidification tank.

[0037] The sewage in the first intermediate tank is returned to the regulating tank mainly when the index of the sewage sent into the regulating tank exceeds the water inlet index of the sewage treatment assembly. At this time, in order to make the water quality treated in each section meet the standard, the sewage in the first intermediate tank can be returned to the regulating tank to dilute the sewage in the regulating tank, so that the index of the sewage in the regulating tank can be adjusted; if the water inlet index in the regulating tank exceeds the standard and the water inlet volume is large, if the sewage in the first intermediate tank is returned to the regulating tank at this time, the return volume is limited, so the dilution effect on the sewage in the regulating tank is limited. At this time, the sewage in the first intermediate tank can be returned to the acidification tank, so as to dilute the sewage in the acidification tank (since the volume of the acidification tank is smaller than that of the regulating tank, when the water inlet volume in the regulating tank is large, the sewage in the first intermediate tank is returned to the acidification tank, so as to avoid the return water occupying the storage capacity of the regulating tank).

[0038] Since the sewage in the first intermediate tank is already in the middle and back end of the sewage treatment process, its water quality is much better than that in the regulating tank, so it can be returned to dilute the sewage in the regulating tank.

[0039] Among them, when the second water pump is started, the eighth valve is in the open state, and when water is delivered to the Fenton tank, the fifth valve is opened, and when water is delivered to the regulating tank, the sixth valve is opened, and when water is delivered to the acidification tank, the seventh valve is opened.

[0040] It should be noted that the above detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0043] Also, when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0044] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0045] For ease of description, spatially relative terms such as "on", "above", "on the upper surface", "upper", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figures. It should be understood that the spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures.

[0046] For example, if a device in a drawing is inverted, a device described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can encompass both "above" and "below." The device may also be oriented in other different ways (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

[0047] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A sewage treatment assembly, characterized in that: The invention comprises a Fenton tank (1), an intermediate tank (2), a secondary sedimentation tank (3), an acid storage tank (4), a salt storage tank (6), a hydrogen peroxide storage tank (7) and a mixer (8); the salt storage tank (6) is used to store ferrous sulfate solution; wastewater treated in the secondary sedimentation tank (3) is discharged into the intermediate tank (2); the acid storage tank (4) is connected to the intermediate tank (2) and a first valve (9) is arranged at the connection point; the water outlet of the intermediate tank (2) and the liquid outlet of the salt storage tank (6) are connected to the Fenton tank (1) through the mixer (8); a second valve (10) is arranged at the connection point between the intermediate tank (2) and the mixer (8); a third valve (11) is arranged at the connection point between the liquid outlet of the salt storage tank (6) and the mixer (8); the hydrogen peroxide storage tank (7) is connected to the Fenton tank (1) and a fourth valve (12) is arranged at the connection point.

2. The sewage treatment assembly according to claim 1, characterized in that: It also includes a first water pump (13), which is arranged between the mixer (8) and the connection point of the Fenton tank (1), and the first water pump (13) is used to pump the wastewater in the intermediate tank (2) into the Fenton tank (1).

3. The sewage treatment assembly according to claim 1, characterized in that: The mixer (8) is a Venturi jet mixer.

4. The sewage treatment assembly according to claim 1, characterized in that: The hydrogen peroxide addition point in the Fenton tank (1) is close to the water inlet of the Fenton tank (1).

5. The sewage treatment assembly according to claim 1, characterized in that: A partition (21) is arranged in the intermediate tank (2), the partition (21) divides the intermediate tank (2) into a first intermediate tank (2a) and a second intermediate tank (2b), and the upper end of the partition (21) is lower than the height of the tank mouth of the intermediate tank (2); the wastewater treated in the secondary sedimentation tank (3) is discharged into the first intermediate tank (2a), and the wastewater in the first intermediate tank (2a) overflows from above the partition (21) into the second intermediate tank (2b); the acid storage tank (4) is connected to the second intermediate tank (2b), and the second intermediate tank (2b) is provided with a water outlet and constitutes the water outlet of the intermediate tank (2).

6. The sewage treatment assembly according to claim 5, characterized in that: The height difference between the upper end of the partition (21) and the upper end of the intermediate pool (2) is not less than 0.5 m.

7. The sewage treatment assembly according to claim 5, characterized in that: It also includes a second water pump (14), the water inlet of the second water pump (14) is connected to the first intermediate pool (2a), the water outlet of the second water pump (14) is also connected to the Fenton pool (1) and a fifth valve (15) is provided at the connection point.

8. The sewage treatment assembly according to claim 7, characterized in that: The water outlet of the second water pump (14) is also connected to the regulating tank (16) and a sixth valve (17) is provided at the connection point.

9. The sewage treatment assembly according to claim 7 or 8, characterized in that: The water outlet of the second water pump (14) is also connected to the acidification tank (18) and a seventh valve (5) is provided at the connection point.

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