Integrated device for removing hypophosphite in wastewater

Abstract

The utility model discloses an integrated device for removing hypophosphite in wastewater. The integrated device comprises an oxidation column, a water inlet and a water outlet are formed in the two sides of the oxidation column respectively, the water outlet is connected to a sedimentation tank, an electrode plate is arranged in the sedimentation tank and connected to an external power supply, and a water outlet pipe is arranged on the sedimentation tank; comprising an ozone generator which is connected to an oxidation column through an air inlet pipe, and a concentration detector is arranged on the air inlet pipe. The ozone catalytic oxidation technology is adopted, the aluminum-based catalyst is adopted for catalyzing ozone to generate hydroxyl free radicals, hypophosphite in waste water is oxidized into orthophosphate, meanwhile, organic pollutants can be degraded, finally, ozone is decomposed to generate oxygen, new pollutants are not generated in the reaction, and the technology is a green technology. The pole plate material of the electric flocculation unit adopts an iron plate, iron ions are generated by electrifying and are combined with generated orthophosphate to form precipitate removal, no extra medicament is needed in the technological process, the mud yield is low, and the operation is simple and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to an integrated device for removing hypophosphite in wastewater. Background Art

[0002] In addition to orthophosphate, industrial wastewater also contains hypophosphite, pyrophosphate and other forms. Orthophosphate and pyrophosphate can generally be directly removed by coagulation and precipitation. Hypophosphite (H2PO2-) has a high solubility in water and is not easy to precipitate, making it difficult to remove from wastewater.

[0003] At present, the commonly used sewage phosphorus removal technologies in my country mainly include biological phosphorus removal, chemical phosphorus removal, and adsorption phosphorus removal. Biological phosphorus removal refers to the use of the characteristics of polyphosphate bacteria to absorb phosphorus aerobically and release phosphorus anaerobically, and the phosphorus is removed from sewage by alternating anaerobic tanks and aerobic tanks. The removed phosphorus is discharged in the form of high-phosphorus sludge. Chemical phosphorus removal refers to the addition of coagulants such as iron salts or aluminum salts to sewage to convert soluble orthophosphates in sewage into insoluble orthophosphate precipitates, which are then transferred to sludge through solid-liquid separation. Adsorption phosphorus removal uses porous solid adsorbents to adsorb phosphorus on the solid surface under the action of molecular gravity or chemical bond forces, thereby achieving the purpose of separation. Phosphorus in the form of orthophosphate and pyrophosphate is easily removed by coagulation and precipitation, while hypophosphite in water has a large solubility and is not easy to form precipitation, making it difficult to remove from sewage. The traditional method uses the Fenton process to oxidize it, but the pH needs to be adjusted when Fenton is used, and a large amount of iron sludge is produced at the same time, which has high treatment costs. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an integrated device for removing hypophosphite in wastewater. The ozone catalytic oxidation process is adopted, and an aluminum-based catalyst is used to catalyze ozone to produce hydroxyl radicals, so that the hypophosphite in the wastewater is oxidized into orthophosphate. At the same time, some organic pollutants can be degraded, and finally oxygen is generated after ozone decomposition. No new pollutants are generated in the reaction. It is a green process. The plate material of the electric flocculation unit is iron plate, and iron ions are generated by electricity, which are combined with the generated orthophosphate to form precipitation for removal. No additional agent is required in the process, and the sludge production is low and the operation is simple.

[0005] In order to solve the above technical problems, the utility model provides an integrated device for removing hypophosphite in wastewater, comprising an oxidation column, wherein a water inlet and a water outlet are respectively arranged on both sides of the oxidation column, wherein the water outlet is connected to a sedimentation tank, wherein an electrode plate is arranged in the sedimentation tank, wherein the electrode plate is connected to an external power supply, and wherein a water outlet pipe is arranged on the sedimentation tank; and comprising an ozone generator, wherein the ozone generator is connected to the oxidation column via an air inlet pipe, and a concentration detector is arranged on the air inlet pipe.

[0006] Furthermore, a first absorption device is provided at the top of the oxidation column, and a potassium iodide solution is provided in the first absorption device.

[0007] Furthermore, the air inlet pipe is connected to a second absorption device, and a potassium iodide solution is arranged in the second absorption device.

[0008] Furthermore, a first gas flow meter is provided on the air inlet pipe.

[0009] Furthermore, a second gas flow meter is provided between the air inlet pipe and the second absorption device.

[0010] Furthermore, the electrode plate is made of iron plate.

[0011] Beneficial effects of the utility model: 1. The device creatively integrates the ozone catalytic oxidation process and the electric flocculation process for the removal of hypophosphite in wastewater, with excellent effect and saving floor space;

[0012] 2. The ozone catalytic oxidation process uses an aluminum-based catalyst to catalyze ozone to produce hydroxyl radicals, which efficiently oxidize hypophosphite to form orthophosphate. No sludge or new pollutants are generated during the process, which is a green treatment process.

[0013] 3. The electro-flocculation process uses iron as the plate material. Under the action of electric current, iron ions are generated, which combine with orthophosphate to form precipitation. No additional reagents are required, and the amount of sludge produced is small.

[0014] 4. The overall integrated equipment is easy to operate and saves labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall plan layout diagram of the utility model.

[0016] Explanation of the numbers in the figure: 1. Oxidation column; 2. Water inlet; 3. Water outlet; 4. Sedimentation tank; 5. Electrode plate; 6. External power supply; 7. Water outlet pipe; 8. Ozone generator; 9. Air inlet pipe; 10. Concentration detector; 11. First absorption device; 12. Second absorption device; 13. First gas flow meter; 14. Second gas flow meter. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "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", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0023] Reference Figure 1 As shown, an embodiment of an integrated device for removing hypophosphite in wastewater of the utility model comprises an oxidation column 1, wherein a water inlet 2 and a water outlet 3 are respectively arranged on both sides of the oxidation column 1, wherein the water outlet 3 is connected to a sedimentation tank 4, wherein an electrode plate 5 is arranged in the sedimentation tank 4, wherein the material of the electrode plate 5 is iron plate, wherein the electrode plate 5 is connected to an external power supply 6, wherein a water outlet pipe 7 is arranged on the sedimentation tank 4; and an ozone generator 8 is comprised, wherein the ozone generator 8 is connected to the oxidation column 1 via an air inlet pipe 9, wherein a concentration detector 10 is arranged on the air inlet pipe 9, wherein a first gas flow meter 13 is arranged on the air inlet pipe 9.

[0024] Industrial wastewater is catalytically oxidized by ozone through the water inlet 2. Under the action of the catalyst, ozone is catalyzed to produce hydroxyl radicals, which then oxidize the hypophosphite in the industrial wastewater to produce orthophosphate. The ozone generator 8 in the reaction process produces ozone, which is regulated by the concentration detector 10 and the first gas flowmeter 13. The effluent of the oxidation column 1 flows into the sedimentation tank 4 of the electroflocculation reaction unit by gravity, and the electrode plate 5 is energized to produce iron ions through electrode action, which combine with orthophosphate to produce precipitation, thereby treating the phosphorus in the wastewater to meet the discharge standards.

[0025] A first absorption device 11 is provided on the top of the oxidation column 1, and a potassium iodide solution is provided in the first absorption device 11. A second absorption device 12 is connected to the air inlet pipe 9, and a potassium iodide solution is provided in the second absorption device 12. Unused ozone is absorbed by the potassium iodide solution.

[0026] A second gas flow meter 14 is provided between the air inlet pipe 9 and the second absorption device 12, and is used together with the first gas flow meter 13 to adjust and record the amount of ozone used.

[0027] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. An integrated device for removing hypophosphite from wastewater, characterized in that: The invention comprises an oxidation column (1), wherein a water inlet (2) and a water outlet (3) are respectively arranged on both sides of the oxidation column (1), wherein the water outlet (3) is connected to a sedimentation tank (4), wherein an electrode plate (5) is arranged in the sedimentation tank (4), wherein the electrode plate (5) is connected to an external power supply (6), and wherein a water outlet pipe (7) is arranged on the sedimentation tank (4); It comprises an ozone generator (8), wherein the ozone generator (8) is connected to the oxidation column (1) via an air intake pipe (9), and a concentration detector (10) is arranged on the air intake pipe (9).

2. The integrated device for removing hypophosphite from wastewater according to claim 1, characterized in that: A first absorption device (11) is arranged at the top of the oxidation column (1), and a potassium iodide solution is arranged in the first absorption device (11).

3. The integrated device for removing hypophosphite from wastewater according to claim 1, characterized in that: The air inlet pipe (9) is connected to a second absorption device (12), and a potassium iodide solution is arranged in the second absorption device (12).

4. The integrated device for removing hypophosphite from wastewater according to claim 1, characterized in that: The air inlet pipe (9) is provided with a first gas flow meter (13).

5. The integrated device for removing hypophosphite from wastewater as claimed in claim 3, characterized in that: A second gas flow meter (14) is provided between the air inlet pipe (9) and the second absorption device (12).

6. The integrated device for removing hypophosphite from wastewater according to claim 1, characterized in that: The electrode plate (5) is made of iron plate.

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