Device for treating thiourea wastewater through electro-catalysis

Abstract

The utility model discloses a device for treating thiourea wastewater by electrocatalysis, which comprises a raw water tank and a raw water lift pump arranged at the output end of the raw water tank, a primary catalysis unit is arranged at the output end of the raw water lift pump, and a secondary catalysis unit is arranged at the output end of the primary catalysis unit. The secondary catalysis unit is connected with the primary catalysis unit through a primary lifting pump, a discharging device is arranged at the output end of the secondary catalysis unit, sewage flows into the secondary catalysis unit through the primary catalysis unit and then is discharged into the discharging device, and the primary electro-catalysis device and the secondary electro-catalysis device generate heat in the electrolysis process; thiourea is decomposed into ammonia, carbon dioxide and liquid hydrogen sulfide under the alkaline heating condition, the components are simple and safe, the thiourea is finally mineralized to achieve the degradation purpose, an operator only needs to set current and voltage values of the first-stage electro-catalysis device and the second-stage electro-catalysis device, operation is easy and convenient, the labor cost is saved, and the production efficiency is improved. The utility model belongs to the technical field of sewage treatment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewage treatment technical field, more specifically relates to a kind of device of electrocatalytic treatment thiourea wastewater. BACKGROUND

[0002] Thiourea is used as a kind of nitrification inhibitor in agriculture to inhibit the oxidation of ammonia nitrogen by nitrifying bacteria to achieve the purpose of maximizing plant nitrogen fertilizer, but in the field of water treatment, the presence of thiourea in waste (polluted) water can cause great harm to the environment.

[0003] Currently, most of the thiourea wastewater is treated by conventional Fenton oxidation process, but this method produces a large amount of sludge, and the utilization rate of hydrogen peroxide is poor. Manual operation is required to control the ratio of H2O2 and FeSO4·7H2O, which is time-consuming and labor-intensive, and thus leads to high treatment cost. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a device for electrocatalytic treatment of thiourea wastewater, which can be easily operated by workers and effectively control the cost.

[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] A device for electrocatalytic treatment of thiourea wastewater, comprising a raw water tank and a raw water lifting pump arranged at the output end of the raw water tank, a first-stage catalytic unit is arranged at the output end of the raw water lifting pump, a second-stage catalytic unit is arranged at the output end of the first-stage catalytic unit, the second-stage catalytic unit is connected to the first-stage catalytic unit through a first-stage lifting pump, the first-stage catalytic unit comprises a first power supply and a first-stage electrocatalytic device arranged at the output end of the first power supply, the second-stage catalytic unit comprises a second-stage electrocatalytic device arranged at the output end of the first-stage lifting pump and a second power supply connected to the second-stage electrocatalytic device, and a discharge device is arranged at the output end of the second-stage catalytic unit.

[0007] According to the first aspect of the utility model, a first liquid level controller is arranged in the raw water tank.

[0008] According to the first aspect of the utility model, the first-stage catalytic unit further comprises a first intermediate barrel arranged at the output end of the first-stage electrocatalytic device and a second liquid level controller arranged in the first intermediate barrel.

[0009] According to the first aspect of the utility model, the output end of the first intermediate barrel is connected to the first-stage lifting pump.

[0010] According to the first aspect of the utility model, the second-stage catalytic unit further comprises a second intermediate barrel and a third liquid level controller arranged in the second intermediate barrel.

[0011] According to the first aspect of the utility model, the input end of the second intermediate barrel is connected with the secondary electro-catalytic device, and the output end of the second intermediate barrel is connected with the discharge device.

[0012] According to the first aspect of the utility model, the discharge device comprises a discharge pump and a collection pool arranged at the output end of the discharge pump.

[0013] The above technical solution of the utility model has at least one of the following advantages or beneficial effects:

[0014] The utility model discloses a primary catalytic unit is arranged at the output end of raw water lifting pump, and after sewage flows into the secondary catalytic unit through the primary catalytic unit, enters the discharge device, the primary electro-catalytic device and secondary electro-catalytic device heat in electrolytic process, and thiocarbamide decomposes into ammonia, carbon dioxide and liquid hydrogen sulfide under the alkaline heating condition, and the composition is simple and safe, finally makes thiocarbamide mineralization, to reach the purpose of degradation, and operating personnel only need to set the current, voltage numerical value of primary electro-catalytic device and secondary electro-catalytic device, and it is simple and easy to operate, saves manual cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model will be further described below in combination with the drawings and examples;

[0016] The utility model discloses a processing flow schematic diagram of one embodiment. Figure 1 For the processing flow schematic diagram of one embodiment of the utility model. DETAILED DESCRIPTION

[0017] The embodiments of the utility model will be described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and can not be understood as the limitation of the utility model.

[0018] In the description of the utility model, it is understood that the orientation description, such as up, down, front, back, left, right and the like, is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the device or element must have a specific orientation, a specific orientation and operation, therefore, it can not be understood as the limitation of the utility model.

[0019] In the description of the utility model, if several meanings are one or more, the meaning of multiple is two or more, greater than, less than, exceed and the like are understood as not including the number, above, below, within and the like are understood as including the number.If there is a description to the first, second is only used for distinguishing technical features for the purpose, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0020] In addition, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features.

[0021] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the term "connection" should be understood broadly, for example, it can be fixed connection or movable connection, or detachable connection or non-detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication between two elements, indirect communication or the interaction relationship between two elements.

[0022] The following disclosure provides many different embodiments or examples for implementing different aspects of the utility model.

[0023] Referring to the accompanying Figure 1 As shown in the drawing, an electrocatalytic device for treating thiourea wastewater, comprising raw water tank 1, raw water lifting pump 2, first-stage catalytic unit 3, second-stage catalytic unit 4 and discharge device 6, wherein raw water tank 1 is used as a buffer device for the entry of thiourea wastewater into the system, and raw water lifting pump 2 is arranged at the output end of raw water tank 1.

[0024] By high-speed rotation of the impeller in the pump shell, centrifugal force is generated, and the thiourea wastewater is thrown out at high speed from the periphery of the impeller, and the high-speed flowing liquid is collected in the pump shell, its speed is reduced, and the pressure is increased. While the impeller throws the thiourea wastewater to the periphery, a low pressure is formed at the center of the suction chamber of the impeller. Under the action of the external atmospheric pressure, the thiourea wastewater continuously enters the impeller to supplement the low pressure area at the center of the suction port of the impeller, thereby enabling the raw water lifting pump 2 to work continuously.

[0025] In an embodiment of the utility model, the raw water lifting pump 2 adopts a single or double impeller structure, greatly improving the through capacity of the thiourea wastewater, and the mechanical seal adopts hard and corrosion-resistant tungsten titanium material, further improving the service life of the raw water lifting pump 2.

[0026] In one embodiment of the utility model, the first catalytic unit 3 is located at the output end of the raw water lifting pump 2, the first catalytic unit 3 includes the first power supply 31, the first electrocatalytic device 32 arranged at the output end of the first power supply 31, the first intermediate barrel 33 arranged at the output end of the first electrocatalytic device 32 and the second liquid level controller 34 arranged in the first intermediate barrel 33.

[0027] In one embodiment of the utility model, the first electrocatalytic device 32 generates heat during electrolysis, thiocarbamide is decomposed into ammonia, carbon dioxide and liquid hydrogen sulfide under the condition of alkaline heating, and finally thiocarbamide is mineralized, so that the purpose of degrading COD Cr is achieved.

[0028] In one embodiment of the utility model, the second catalytic unit 4 is arranged at the output end of the first catalytic unit 3, the second catalytic unit 4 is connected with the first catalytic unit 3 through the first lifting pump 5, the output end of the first intermediate barrel 33 is connected with the first lifting pump 5, the second catalytic unit 4 includes the second electrocatalytic device 41 arranged at the output end of the first lifting pump 5, the second power supply 42 connected with the second electrocatalytic device 41, the second intermediate barrel 43 and the third liquid level controller 44 arranged in the second intermediate barrel 43, the input end of the second intermediate barrel 43 is connected with the second electrocatalytic device 41, the output end of the second intermediate barrel 43 is connected with the discharge device 6, and finally the discharge pump 61 is discharged to the collection tank 62.

[0029] In one embodiment of the utility model, the output end of the second catalytic unit 4 is provided with the discharge device 6, the discharge device 6 includes the discharge pump 61 and the collection tank 62 arranged at the output end of the discharge pump 61, the electrocatalytic thiocarbamide wastewater treatment device has the advantages of small floor area, disposable investment, no need for sedimentation tank and other structures, high removal efficiency of various pollutants, thiocarbamide removal rate greater than 99%, COD removal rate greater than 90%, total nitrogen removal rate greater than 93% and organic nitrogen removal rate greater than 88%.

[0030] In one embodiment of the utility model, the first liquid level controller 7 is arranged in the raw water tank 1, the second liquid level controller 34 is arranged in the first intermediate barrel 33, and the third liquid level controller 44 is arranged in the second intermediate barrel 43, because the height of wastewater in the raw water tank 1, the first intermediate barrel 33 and the second intermediate barrel 43 is measured and monitored respectively, the height of wastewater is mainly measured to adjust the inflow and outflow of wastewater in the first catalytic unit 3 and the second catalytic unit 4, so that the wastewater is always in the set liquid level range in the raw water tank 1, the first intermediate barrel 33 and the second intermediate barrel 43.

[0031] In one embodiment of the utility model, since thiourea has strong reducibility and exists in a large amount in actual wastewater, the actual wastewater has a low pH value, and the previous treatment needs to increase the dosage of alkali, but the device for electrocatalytic treatment of thiourea wastewater only needs to adjust the pH value to be greater than 3 to add the thiourea wastewater to treat thiourea, which reduces the dosage of alkali compared with the traditional method for treating thiourea wastewater and saves the cost of reagents.

[0032] In one embodiment of the utility model, the first intermediate barrel 33 is injected into the second electrocatalytic device 41 to perform electrolytic catalysis through the first-stage booster pump 5 after the initial treatment of thiourea wastewater, and the first-stage electrocatalytic device 32 and the second-stage electrocatalytic device 41 generate heat during the electrolysis process, so that the thiourea is decomposed into ammonia, carbon dioxide and liquid hydrogen sulfide under the condition of alkaline heating, the composition is relatively simple and safe, and secondary pollution is not caused, green and efficient treatment and standard discharge can be realized, and the thiourea is mineralized and degraded COD Cr Compared with the traditional method for treating thiourea wastewater, such as Fenton, the device for electrocatalytic treatment of thiourea wastewater has the advantages of high utilization of hydrogen peroxide and small amount of mud, and the operation and treatment cost are very obvious.

[0033] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An apparatus for electrocatalytically treating thiourea wastewater, comprising a raw water tank (1) and a raw water booster pump (2) provided at the output end of the raw water tank (1), characterized in that, The output end of the raw water lifting pump (2) is provided with a first catalytic unit (3), the output end of the first catalytic unit (3) is provided with a second catalytic unit (4), the second catalytic unit (4) is connected with the first catalytic unit (3) through a first lifting pump (5), the first catalytic unit (3) comprises a first power supply (31) and a first electro-catalytic device (32) arranged at the output end of the first power supply (31), the second catalytic unit (4) comprises a second electro-catalytic device (41) arranged at the output end of the first lifting pump (5) and a second power supply (42) connected with the second electro-catalytic device (41), and the output end of the second catalytic unit (4) is provided with a discharge device (6).

2. The device for electrocatalytic treatment of thiourea wastewater according to claim 1, characterized in that: The raw water tank (1) is provided with a first liquid level controller (7).

3. The device for electrocatalytic treatment of thiourea wastewater according to claim 1, characterized in that: The first catalytic unit (3) further comprises a first intermediate barrel (33) arranged at the output end of the first electro-catalytic device (32) and a second liquid level controller (34) arranged in the first intermediate barrel (33).

4. The device for electrocatalytic treatment of thiourea wastewater according to claim 3, characterized in that: The output end of the first intermediate barrel (33) is connected with the first lifting pump (5).

5. The device for electrocatalytic treatment of thiourea wastewater according to claim 1, characterized in that: The second catalytic unit (4) further comprises a second intermediate barrel (43) and a third liquid level controller (44) arranged in the second intermediate barrel (43).

6. The device for electrocatalytic treatment of thiourea wastewater according to claim 5, characterized by the fact that: The input end of the second intermediate barrel (43) is connected with the second electro-catalytic device (41), and the output end of the second intermediate barrel (43) is connected with the discharge device (6).

7. The device for electrocatalytic treatment of thiocyanate waste water according to claim 6, characterized in that The discharge device (6) comprises a discharge pump (61) and a collection pool (62) arranged at the output end of the discharge pump (61).

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