Downward flow type sulfur packed bed reaction device

Abstract

The utility model discloses a down-flow type sulfur packed bed reaction device, which belongs to the technical field of industrial wastewater treatment and comprises an outer tank body (1), an upper cover plate I (2), an inner tank body (3) and an upper cover plate II (4), the inner tank body (3) is fixed on the upper cover plate I (2) and is arranged in the middle of a cavity in the outer tank body (1), a bearing plate (5) is arranged in the inner tank body (3), a bearing layer (6) is arranged on the bearing plate (5), and the upper cover plate II (4) is fixed on the upper cover plate I (2). A supporting layer (6) is arranged on the outer tank body (1), a sulfur filler is arranged above the supporting layer (6), a water inlet (7) is formed in the upper cover plate II (4), the water inlet (7) is formed above the sulfur filler, a drain outlet (8) is formed in the bottom of the outer tank body (1), and a water outlet (9) is formed above the outer tank body (1); the sulfur filler fixed bed and the precipitation system are combined, the whole device is integrally designed, the cost is reduced, and the device is simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model belongs to the field of industrial wastewater treatment and relates to a downflow fixed bed reaction device, in particular to a downflow fixed bed reaction device for treating electroplating wastewater by utilizing biological reduction of elemental sulfur. Background Art

[0002] Electroplating wastewater contains about 29% toxic and hazardous wastes, including a large number of heavy metal ions, cyanide complexes, COD, organic solvents and other complex effluent components. The concentration of toxic metal ions, such as copper, chromium, nickel, zinc, mercury, cobalt, etc., is much higher than the permitted level. Therefore, the wastewater from the electroplating industry must be properly treated before discharge.

[0003] Sulfides combine with heavy metals. Compared with hydroxides, metal sulfides have a lower solubility product and are easier to precipitate. Sulfides combine with heavy metals to form precipitation, which effectively removes heavy metals from electroplating wastewater. However, the transportation and storage of chemical sulfides are dangerous and costly, while biological sulfides can eliminate the above disadvantages. Biological sulfate reduction is a common method for producing biological sulfides, but the method has a high carbon source cost. Compared with sulfate reduction, biological reduction of elemental sulfur can produce the same amount of biological sulfides, which can theoretically save three-quarters of the carbon source. This method has received widespread attention in recent years.

[0004] At present, in the research on the use of elemental sulfur reduction to produce sulfide to remove heavy metals in wastewater, the reaction device is mostly an upflow sulfur packed bed reactor, but this device has the following disadvantages: (1) The generated metal precipitate is easy to accumulate in the sulfur packed bed and wrap around the elemental sulfur, which reduces the mass transfer efficiency and the yield of metal sulfide; (2) The device is connected to a sedimentation tank, and the split design is inconvenient to operate, which increases the treatment process and cost; (3) The metal sulfide precipitate of the device is mixed with the elemental sulfur filler and microorganisms, and is not easy to separate from the device, which affects the resource utilization of high-concentration heavy metals in the wastewater. Utility Model Content

[0005] The utility model aims to overcome the shortcomings of the above existing devices and provide a downflow fixed bed reaction device which is simple in structure and integrates a sulfur-filled bed and a sedimentation tank and utilizes biological reduction of elemental sulfur to treat electroplating wastewater.

[0006] In order to solve the above technical problems, the utility model provides a downflow sulfur packed bed reaction device, comprising an outer tank body, an upper cover plate 1, an inner tank body, and an upper cover plate 2, wherein the upper cover plate 1 is arranged above the outer tank body, the inner tank body is fixed on the upper cover plate 1, the upper cover plate 2 is arranged at the upper edge of the inner tank body, the inner tank body is arranged in the middle of a cavity in the outer tank body, a supporting plate is arranged in the inner tank body, a sulfur filler is arranged on the supporting plate, a water inlet is arranged on the upper cover plate 2, the water inlet is arranged above the sulfur filler, a sewage outlet is arranged at the bottom of the outer tank body, and a water outlet is arranged above the outer tank body.

[0007] As a further improvement measure of the utility model, the above-mentioned downflow sulfur packed bed reaction device is provided with sieve holes on the supporting plate.

[0008] As a further improvement measure of the utility model, in the above-mentioned downflow sulfur packed bed reaction device, the sulfur filler arranged on the support plate is granular, and the particle diameter of the sulfur filler is 0.3mm to 2mm.

[0009] As a further improvement measure of the utility model, in the above-mentioned downflow sulfur packed bed reaction device, the particle diameter of the upper layer of the sulfur filler is 0.3mm to 0.8mm, and the particle diameter of the lower layer of the sulfur filler is 0.8mm to 2mm.

[0010] As a further improvement measure of the utility model, the above-mentioned downflow sulfur packed bed reaction device is provided with a spray device at the port of the water inlet.

[0011] As a further improvement measure of the utility model, in the above-mentioned downflow sulfur-packed bed reaction device, the lower part of the outer tank body is arranged as an inverted cone-shaped concentration chamber, the sewage outlet is arranged at the bottom of the concentration chamber, and a valve is arranged at the sewage outlet; the middle part of the outer tank body is arranged as a separation chamber, the upper part of the outer tank body is arranged as a water collection chamber, and the drain outlet is arranged at the upper edge of the water collection chamber.

[0012] As a further improvement measure of the utility model, the above-mentioned downflow sulfur packed bed reaction device is provided with a ventilation pipe in the outer tank body, and the air outlet of the ventilation pipe is arranged above the upper cover plate.

[0013] As a further improvement measure of the utility model, in the above-mentioned downflow sulfur packed bed reaction device, the lower part of the inner tank body is configured to be in a bell-mouth shape, and an annular flow channel is provided between the bell-mouth edge below the inner tank body and the inner wall of the outer tank body.

[0014] As a further improvement measure of the utility model, the above-mentioned downflow sulfur packed bed reaction device is provided with a guide part below the inner tank body, and the guide part and the inner tank body are connected by flange 2; coarse quartz sand is provided on the supporting layer.

[0015] As a further improvement measure of the utility model, in the above-mentioned downflow sulfur packed bed reaction device, the outer tank body is arranged into two parts, an upper part and an lower part, and flange 1 is arranged on the outer sides of the upper and lower parts.

[0016] Compared with the prior art, the beneficial effects of the utility model are: 1. The utility model constructs a fixed bed of sulfur filler and a downflow water inlet method to separate metal sulfide and elemental sulfur, which is beneficial to the recovery of metal sulfide and improves production efficiency; 2. The utility model establishes an elemental sulfur-reducing bacteria hydrogen sulfide production system, which produces the same equivalent of sulfide and consumes less carbon source than sulfate-reducing bacteria; 3. The utility model combines a fixed bed of sulfur filler and a precipitation system, and the integrated design of the entire device reduces costs, has a simple equipment structure, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a top view of the utility model.

[0018] Figure 2 yes Figure 1 AA section view.

[0019] Figure 3 yes Figure 2 Middle BB section view.

[0020] Explanation of the accompanying numbers: 1-outer tank body, 2-upper cover plate 1, 3-inner tank body, 4-upper cover plate 2, 5-supporting plate, 6-supporting layer, 7-water inlet, 8-sewage outlet, 9-drainage outlet, 10-sieve hole, 11-spraying device, 12-concentration chamber, 13-valve, 14-separation chamber, 15-water collecting chamber, 16-ventilation pipe, 17-guiding part, 18-flange 2, 19-flange 1. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] like Figures 1 to 3A downflow sulfur packed bed reaction device shown in the figure comprises an outer tank body 1, an upper cover plate 2, an inner tank body 3, and an upper cover plate 2 4. The upper cover plate 2 is arranged above the outer tank body 1, and a through hole is arranged on the upper cover plate 2. The inner tank body 3 is fixed on the upper cover plate 2 through the through hole; the upper cover plate 2 4 is arranged on the upper edge of the inner tank body 3, the inner tank body 3 is arranged in the middle of the cavity in the outer tank body 1, a supporting plate 5 is arranged in the inner tank body 3, a sieve hole 10 is arranged on the supporting plate 5, and coarse quartz sand is arranged on the supporting layer 6. A sulfur filler is arranged on the supporting plate 5. The sulfur filler arranged on the supporting plate 5 is granular, i.e., sulfur particles. The particle diameter of the sulfur filler is 0.3 mm to 2 mm. The particle diameter of the sulfur filler arranged on the lower layer is larger, i.e., 1.2 mm. The particle diameter of the sulfur filler arranged on the upper layer is smaller, i.e., 0.5 mm. A guide portion 17 is arranged below the inner tank body 3, and the guide portion 17 is connected to the inner tank body 3 by a flange 2 18.

[0023] A water inlet 7 is arranged on the upper cover plate 4, and the water inlet 7 is arranged above the sulfur filler. A spray device 11 is arranged at the end of the water inlet 7. The electroplating wastewater is sprayed onto the sulfur filler by the spray device 11 through the water inlet 7, which can increase the contact area between the electroplating wastewater and the sulfur filler.

[0024] An inverted cone-shaped concentration chamber 12 is provided at the bottom of the outer tank body 1, and a sewage outlet 8 is provided at the bottom of the outer tank body 1. The sewage outlet 8 is provided at the bottom of the concentration chamber 12, and a valve 13 is provided at the sewage outlet 8; a separation chamber 14 is provided in the middle of the outer tank body 1, and the separation chamber 14 is used to separate the sediment and the supernatant. The upper part of the outer tank body 1 is provided with a water collecting chamber 15, and the supernatant enters the water collecting chamber 15, and the sediment sinks into the concentration chamber 12; a drainage port 9 is provided at the upper edge of the water collecting chamber 15, and the supernatant is discharged from the drainage port 9. Electroplating wastewater may generate gas when passing through the sulfur-filled fixed bed, so a vent pipe 16 is provided in the outer tank body 1, and the gas outlet of the vent pipe 16 is provided above the upper cover plate 2 to discharge the generated gas. The lower part of the guide part 17 is provided with a bell-shaped shape, and an annular flow channel is provided between the bell-shaped edge below the guide part 17 and the inner wall of the outer tank body 1. In this way, the sediment can be precipitated downward, and the supernatant can flow upward through the annular flow channel.

[0025] The outer tank body 1 is configured as two parts, an upper part and an lower part, and the outer sides of the upper and lower parts are connected by a flange 19, which is convenient for disassembly and connection.

[0026] During use of the utility model, the flange 19 and the flange 2 18 are first opened, coarse quartz sand is placed on the supporting layer 6, the flange 2 18 is fixed, the cover plate 2 is opened, sulfur particles of different sizes are loaded on the supporting layer 6 according to a certain gradation, sulfur particles with a diameter of 1.2 mm are placed at the bottom of the supporting layer 6, and sulfur particles with a diameter of 0.5 mm are placed at the top to form a fixed bed of sulfur filler; the spray device 11 is then placed on the cover plate 2, and the cover plate 2 is then placed. The upper and lower parts of the outer tank body 1 are then fixedly connected by the flange 19.

[0027] First, elemental sulfur-reducing bacteria are enriched to form biofilm on the sulfur filler. In the initial startup phase of the reactor, the influent is the prepared elemental sulfur-reducing bacteria culture medium. In order to quickly enrich elemental sulfur-reducing bacteria, a certain concentration of sulfide is added to the initial influent. The characteristic that elemental sulfur and sulfide react to generate polysulfide, which is easily utilized by microorganisms, is utilized to achieve rapid biofilm formation on the sulfur filler. The wastewater is sprayed onto the fixed bed of sulfur filler through the spray device 11. In the startup phase of the reactor, the influent is prepared with the elemental sulfur-reducing bacteria culture medium component. When the reactor stably produces sulfide, the reactor is successfully started.

[0028] Then the effluent sulfide concentration is detected every 24 hours. When the sulfide concentration gradually increases, it indicates that elemental sulfur-reducing bacteria are continuously enriched on the sulfur filler. Usually, the effluent sulfide concentration detected is about 100 mg·S / L, indicating that the sulfur filler fixed bed is successfully started.

[0029] When the effluent produces stable sulfide, electroplating wastewater is added to the water inlet 7 through the spray device 11, and the heavy metal concentration in the electroplating wastewater increases step by step from low to high. When each level of heavy metal can be completely removed, the heavy metal concentration is increased again, and the supernatant is discharged through the drain port 9. When heavy metals are detected in the drain port 9, it means that the system's tolerance to heavy metal concentration has reached the maximum value, and the tolerance threshold of the heavy metal of the device is determined. The higher heavy metal concentration inhibits the activity of microorganisms, resulting in a poor heavy metal removal effect. When the sediment settles at the bottom of the conical funnel and occupies 30% of the volume of the conical funnel, stop the water intake, open the bottom mud pipe valve 13, and the metal sulfide sediment is discharged from the sewage outlet 8, and then re-intake water, and so on.

[0030] The above describes the implementation mode of the utility model in detail in conjunction with the accompanying drawings, but the utility model is not limited to the above implementation mode. For ordinary technicians in this field, several modifications and improvements can be made without departing from the present invention, and these should also be regarded as belonging to the protection scope of the present utility model.

Claims

1. A downflow sulfur packed bed reaction device, comprising an outer tank body (1), an upper cover plate 1 (2), an inner tank body (3), and an upper cover plate 2 (4), wherein the upper cover plate 1 (2) is arranged above the outer tank body (1), the inner tank body (3) is fixed on the upper cover plate 1 (2), and the upper cover plate 2 (4) is arranged on the upper edge of the inner tank body (3), characterized in that: The inner tank body (3) is arranged in the middle of the cavity in the outer tank body (1), a support plate (5) is arranged in the inner tank body (3), a support layer (6) is arranged on the support plate (5), a sulfur filler is arranged above the support layer (6), a water inlet (7) is arranged on the upper cover plate (4), the water inlet (7) is arranged above the sulfur filler, a sewage outlet (8) is arranged at the bottom of the outer tank body (1), and a drainage outlet (9) is arranged above the outer tank body (1).

2. A downflow sulfur packed bed reaction device according to claim 1, characterized in that: The support plate (5) is provided with sieve holes (10).

3. A downflow sulfur packed bed reaction device according to claim 2, characterized in that: The sulfur filler arranged on the supporting plate (5) is in the form of particles, and the particle diameter of the sulfur filler is 0.3 mm to 2 mm.

4. A downflow sulfur packed bed reaction device according to claim 3, characterized in that: The particle diameter of the upper layer of the sulfur filler is 0.3 mm to 0.8 mm, and the particle diameter of the lower layer of the sulfur filler is 0.8 mm to 2 mm.

5. A downflow sulfur packed bed reaction device according to claim 1, characterized in that: A spray device (11) is provided at the port of the water inlet (7).

6. A downflow sulfur packed bed reaction device according to claim 1, characterized in that: An inverted cone-shaped concentration chamber (12) is arranged below the outer tank body (1); the sewage outlet (8) is arranged at the bottom of the concentration chamber (12); and a valve (13) is arranged at the sewage outlet (8); the middle part of the outer tank body (1) is arranged as a separation chamber (14); the upper part of the outer tank body (1) is arranged as a water collection chamber (15); and the drainage outlet (9) is arranged at the upper edge of the water collection chamber (15).

7. A downflow sulfur packed bed reaction device according to claim 1, characterized in that: A ventilation pipe (16) is arranged inside the outer tank body (1), and an air outlet of the ventilation pipe (16) is arranged above the upper cover plate 1 (2).

8. The downflow sulfur packed bed reaction device according to claim 1, characterized in that: The lower part of the inner tank body (3) is arranged in a bell-mouth shape, and an annular flow channel is arranged between the bell-mouth edge at the lower part of the inner tank body (3) and the inner wall of the outer tank body (1).

9. A downflow sulfur packed bed reaction device according to claim 1, characterized in that: A guide portion (17) is provided below the inner tank body (3), and the guide portion (17) and the inner tank body (3) are connected by a second flange (18); and coarse quartz sand is provided on the supporting layer (6).

10. A downflow sulfur packed bed reaction device according to claim 1, characterized in that: The outer tank body (1) is configured to be composed of two parts, an upper part and an lower part, and flanges 1 (19) are provided on the outer sides of the upper and lower parts.

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