Thallium removal device for desulfurization wastewater

Abstract

The utility model belongs to the technical field of desulfurization wastewater treatment equipment, and particularly relates to a thallium removal device for desulfurization wastewater. The device for removing thallium from desulfurization wastewater comprises a water feeding pump, a dosing pipe section, a reaction clarifier and a clear water tank which are sequentially communicated, wherein an oxidizing agent dosing device, an organic sulfur dosing device, a flocculating agent dosing device and a coagulant aid dosing device are sequentially communicated on the dosing pipe section along the material flow direction. According to the utility model, the oxidizing agent doser, the organic sulfur doser, the flocculating agent doser and the coagulant aid doser are arranged, so that thallium ions in the desulfurization wastewater can be removed in the reaction clarifier.

Description

TECHNICAL FIELD

[0001] The utility model belongs to desulfurization wastewater treatment equipment technical field, specifically related to a desulfurization wastewater thallium removal device. BACKGROUND

[0002] Desulfurization wastewater is the wastewater produced in the flue gas desulfurization process, and contains a large amount of sodium, calcium, magnesium, ammonia nitrogen, fluorine, chlorine, sulfate ions, and a small amount of thallium, mercury, cadmium, chromium, arsenic, lead, nickel, zinc and other heavy metal pollutants, especially the steel sintering flue gas and metallurgical flue gas contains a high content of thallium. The conventional treatment process of desulfurization wastewater is a three-way box or an integrated device, which has good removal effect on trivalent thallium in desulfurization wastewater, and poor removal effect on monovalent thallium, which is prone to the problem of thallium exceeding standard in drainage. SUMMARY

[0003] In order to solve the problems of the prior art, the utility model provides a desulfurization wastewater thallium removal device. Through the technical scheme of the utility model, thallium ions in desulfurization wastewater can be removed.

[0004] The technical scheme provided by the utility model is as follows:

[0005] A desulfurization wastewater thallium removal device, comprising a water supply pump, a dosing pipe section, a reaction clarifier and a clean water tank which are sequentially and communicatively arranged, wherein an oxidizing agent dosing device, an organic sulfur dosing device, a flocculant dosing device and a coagulant aid dosing device are sequentially and communicatively arranged on the dosing pipe section along the material flow direction.

[0006] The above technical scheme can remove thallium ions in desulfurization wastewater in the reaction clarifier by arranging the oxidizing agent dosing device, the organic sulfur dosing device, the flocculant dosing device and the coagulant aid dosing device.

[0007] Specifically, the reaction clarifier comprises a pool body and a stirrer arranged at the center of the pool body, the liquid inlet of the reaction clarifier is close to the stirrer, and the clear liquid outlet of the reaction clarifier is arranged on the pool wall of the pool body.

[0008] Further, a flow guide plate is arranged in the pool body, and the flow guide plate forms a flow channel communicating the liquid inlet and the clear liquid outlet.

[0009] Further, a cylinder is arranged outside the stirrer, the upper end of the cylinder is fixedly connected with the upper cover of the reaction clarifier, the upper part of the cylinder is provided with an outlet, and the lower end of the cylinder is open.

[0010] Specifically, the flow guide plate is a vertically arranged scroll structure, which is spirally and gradually arranged from the center of the pool body to the pool wall of the pool body.

[0011] Specifically:

[0012] The upper edge of the flow guide plate is fixedly connected with the upper cover of the reaction clarifier.

[0013] A gap is arranged between the lower edge of the flow guide plate and the bottom wall of the reaction clarifier.

[0014] Further, the height of the lower edge of the flow guide plate gradually increases from the stirrer to the pool wall.

[0015] Based on the above technical scheme, the structure of the flow guide plate can ensure that the desulfurization wastewater is fully flocculated and precipitated before flowing out of the reaction clarifier, and excessive resistance is not brought to the flow of the desulfurization wastewater.

[0016] Specifically, a liquid flow outlet is arranged at one end of the flow guide plate close to the pool wall.

[0017] Further, the reaction clarifier has a clear liquid outlet and a sludge outlet, the clear liquid outlet is communicated with the clear water tank, and the sludge outlet is communicated with a sludge pump.

[0018] Specifically, the water supply pump is communicated with a desulfurization wastewater pipeline.

[0019] Specifically, the desulfurization wastewater pipeline is a desulfurization wastewater pipeline of a flue gas desulfurization system.

[0020] The beneficial effects of the utility model are as follows:

[0021] The desulfurization wastewater thallium removal device can remove thallium ions in the desulfurization wastewater, and the content of the thallium ions can be less than 0.05 mg / L; suspended solids can be removed by the reaction clarifier, and the content of the suspended solids can be less than 100 mg / L. Thus, the product after the desulfurization wastewater treatment can be easily used in the factory, and the resource utilization level of the desulfurization wastewater is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the desulfurization wastewater thallium removal device provided by the utility model.

[0023] Figure 2 is a structural schematic view of the reaction clarifier.

[0024] Figure 3 is an internal plan view of the reaction clarifier.

[0025] ATTACHMENT Figure 1 , 2 , 3, the structure represented by each reference numeral is listed as follows:

[0026] 1, water supply pump; 2, reaction clarifier; 21, pool body; 22, stirrer; 23, flow guide plate; 3, clear water tank; 4, sludge pump; 5, dosing pipe section; 6, oxidant dosing device; 7, organic sulfur dosing device; 8, flocculant dosing device; 9, coagulant dosing device; 10, liquid flow outlet. DETAILED DESCRIPTION

[0027] The principles and features of the present application are described below, and the examples are used to explain the present application, but are not intended to limit the scope of the present application.

[0028] It should be noted that when a part or component is considered to be "connected", "located", "assembled" on another part or component, it can be directly arranged on another part or component or there can be a middle part or component. The terms "left", "right", "up", "down" and similar expressions used herein are for illustrative purposes only.

[0029] The materials, reagents, etc. used are commercially available reagents and materials unless otherwise specified.

[0030] Example 1

[0031] As shown in Figure 1 , the desulfurization wastewater thallium removal device comprises a water supply pump 1, a dosing pipe section 5, a reaction clarifier 2 and a clean water tank 3 which are sequentially and communicatively arranged, and an oxidizing agent dosing device 6, an organic sulfur dosing device 7, a flocculant dosing device 8 and a coagulant dosing device 9 which are sequentially and communicatively arranged on the dosing pipe section 5 along the material flow direction. This technical scheme can remove thallium ions in the desulfurization wastewater in the reaction clarifier by arranging the oxidizing agent dosing device, the organic sulfur dosing device, the flocculant dosing device and the coagulant dosing device.

[0032] Example 2

[0033] Based on example 1, as shown in Figure 2 , the reaction clarifier 2 comprises a pool body 21 and a stirrer 22 arranged at the center of the pool body 21, the liquid inlet of the reaction clarifier 2 is close to the stirrer 22, and the clear liquid outlet of the reaction clarifier 2 is arranged on the pool wall of the pool body 21. This technical scheme can conveniently realize reagent treatment and flocculation.

[0034] Example 3

[0035] Based on example 2, as shown in Figure 2 , 3 , a flow guide plate 23 is arranged in the pool body 21. The flow guide plate 23 is a vertically arranged scroll structure, which is arranged spirally and gradually from the center of the pool body 21 to the pool wall of the pool body 21, and a flow channel is formed by the flow guide plate 23 to connect the liquid inlet and the clear liquid outlet. In addition, the upper edge of the flow guide plate 23 is fixedly connected with the upper cover of the reaction clarifier 2, and a gap is arranged between the lower edge of the flow guide plate 23 and the bottom wall of the reaction clarifier 2.

[0036] Further, the height of the lower edge of the guide plate 23 gradually increases from the agitator 22 to the pool wall, and a liquid flow outlet 10 is arranged at the end of the guide plate 23 close to the pool wall.

[0037] The technical solution can increase the path of the flow channel and fully exert the treatment effect.

[0038] Example 4

[0039] Based on example 3, as shown in the drawings, a cylinder can be arranged outside the agitator 22. The upper end of the cylinder is fixedly connected with the upper cover of the reaction clarifier 2, the upper part of the cylinder is provided with an outlet, and the lower end of the cylinder is open. The technical solution can improve the treatment effect in the stirring stage. Figure 2 Example 5

[0040] Based on example 4, as shown in the drawings, the reaction clarifier 2 is provided with a clear liquid outlet and a sludge outlet, the clear liquid outlet is communicated with the clear water tank 3, and the sludge outlet is communicated with the sludge pump 4. The technical solution can further treat the sludge.

[0041] Figure 1 Example 6

[0042] The water inlet is suitable for desulfurization wastewater of a flue gas desulfurization system, the thallium of the water inlet is 1-10 mg / L, and the suspended solids are 1000-10000 mg / L.

[0043] Specifically, the thallium of the water inlet is about 5 mg / L, and the suspended solids are about 5000 mg / L.

[0044] The oxidizing agent feeder 6: for example, hydrogen peroxide is used, and the feeding concentration is 10 mg / L.

[0045] The organic sulfur feeder 7: for example, organic sulfur is used, and the feeding amount is 5 mg / L.

[0046] The flocculant feeder 8: for example, polyaluminum chloride is used, and the feeding amount is 30 mg / L.

[0047] The coagulant feeder 9: for example, polyacrylamide is used, and the feeding amount is 1 mg / L.

[0048] The thallium of the water outlet is less than 0.05 mg / L, and the suspended solids are less than 100 mg / L.

[0049] Comparative example 1

[0050] Referring to example 5, the difference is that the oxidizing agent feeder 6 is not arranged, and the result is that the thallium of the water outlet is about 2.5 mg / L.

[0051] Comparative example 2

[0052] The thallium of the water outlet is less than 0.05 mg / L, and the suspended solids are less than 100 mg / L.

[0053] ​Reference Example 5, except that the organic sulfur feeder 7 is not provided, and the result is that the thallium in the effluent is about 5 mg / L.

[0054] Comparative Example 3

[0055] Reference Example 5, except that the flocculant feeder 8 is not provided, and the result is that the suspended solids in the effluent are greater than 300 mg / L.

[0056] Comparative Example 4

[0057] Reference Example 5, except that the coagulant aid feeder 9 is not provided, and the result is that the suspended solids in the effluent are greater than 200 mg / L.

[0058] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in any form; any person skilled in the art can implement the present application according to the drawings and the above; however, any equivalent changes, modifications and evolutions made by those skilled in the art within the scope of the technical scheme of the present application, using the above disclosed technical content, are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolutions made according to the essential technology of the present application to the above embodiments are still within the protection scope of the technical scheme of the present application.

Claims

1. A thallium removal device for desulfurization wastewater, characterized in that: The invention comprises a water supply pump (1), a dosing pipe section (5), a reaction clarifier (2) and a clean water tank (3) which are sequentially connected. An oxidant doser (6), an organic sulfur doser (7), a flocculant doser (8) and a coagulant aid doser (9) are sequentially connected on the dosing pipe section (5) along the material flow direction.

2. The desulfurization wastewater thallium removal device according to claim 1, characterized in that: The reaction clarifier (2) comprises a tank body (21) and an agitator (22) arranged at the center of the tank body (21); the liquid inlet of the reaction clarifier (2) is close to the agitator (22); and the clear liquid outlet of the reaction clarifier (2) is arranged on the tank wall of the tank body (21).

3. The desulfurization wastewater thallium removal device according to claim 2, characterized in that: A guide plate (23) is provided in the pool body (21), and the guide plate (23) forms a flow channel connecting the liquid inlet and the clear liquid outlet.

4. The desulfurization wastewater thallium removal device according to claim 3, characterized in that: The guide plate (23) is a vertically arranged roll-shaped structure, and is spirally arranged from the center of the pool body (21) toward the pool wall of the pool body (21).

5. The desulfurization wastewater thallium removal device according to claim 4, characterized in that: The upper edge of the guide plate (23) is fixedly connected to the upper cover of the reaction clarifier (2); A gap is provided between the lower edge of the guide plate (23) and the bottom wall of the reaction clarifier (2).

6. The desulfurization wastewater thallium removal device according to claim 5, characterized in that: The height of the lower edge of the guide plate (23) gradually increases from the agitator (22) toward the pool wall.

7. The desulfurization wastewater thallium removal device according to claim 6, characterized in that: A liquid outlet (10) is provided at one end of the guide plate (23) close to the pool wall.

8. The desulfurization wastewater thallium removal device according to claim 1, characterized in that: The reaction clarifier (2) has a clear liquid outlet and a sludge outlet, the clear liquid outlet is connected to the clean water tank (3), and the sludge outlet is connected to a sludge pump (4).

9. The thallium removal device for desulfurization wastewater according to any one of claims 1 to 8, characterized in that: The water supply pump (1) is connected to the desulfurization wastewater pipeline.

10. The desulfurization wastewater thallium removal device according to claim 9, characterized in that: The desulfurization wastewater pipeline is a desulfurization wastewater pipeline of a flue gas desulfurization system.

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