Papermaking wastewater denitrification device

Abstract

The utility model relates to a papermaking wastewater denitrification device which comprises an acidification tank, an anoxic tank, an aeration tank and a secondary sedimentation tank, a first pipeline is connected between the acidification tank and the anoxic tank, a second pipeline is connected between the anoxic tank and the aeration tank, and a third pipeline is connected between the aeration tank and the secondary sedimentation tank. A third pipeline is connected between the secondary sedimentation tank and the anoxic tank, and the secondary sedimentation tank is connected with a water outlet pipe. The papermaking wastewater denitrification device can enhance the environment-friendly water treatment capacity, reduce the risk of environmental pollution and stabilize production operation.

Description

Technical Field

[0001] This utility model specifically relates to a device for denitrification of papermaking wastewater. Background Technology

[0002] With the promulgation of the "Emission Standard for Water Pollutants from Paper Industry" (GB3544-2008), compared with the "Emission Standard for Water Pollutants from Paper Industry" (GB3544-2001), the new standard not only improves the control of CODCr, BOD5, SS, and AOX, but also adds controls for indicators such as color, ammonia nitrogen, total nitrogen, total phosphorus, and dioxins. As is well known, the paper industry consumes a large amount of water and causes serious pollution, making it a key area of ​​environmental protection monitoring in my country. Although the pollution load of waste paper recycling wastewater is relatively lighter compared to the direct pulping process using plant fibers, it still far exceeds the emission standards.

[0003] Due to the high concentration of pollutants and poor biodegradability of pulp and paper wastewater, it requires hydrolysis and acidification to improve its biodegradability after pretreatment. It then undergoes anaerobic, aerobic, and advanced treatment systems to ultimately meet the new emission standards. In the pulp and paper process, except for wastewater from the ammonium nitrite pulping process, nitrogen and phosphorus-containing chemicals are rarely added. However, to ensure the efficient and stable operation of the anaerobic treatment system, sufficient external nutrients (nitrogen and phosphorus fertilizers) are needed for the anaerobic microorganisms to utilize. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a device for denitrification of papermaking wastewater.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a device for denitrification of papermaking wastewater, comprising an acidification tank, an anoxic tank, an aeration tank and a secondary sedimentation tank, wherein a first pipe connects the acidification tank and the anoxic tank, a second pipe connects the anoxic tank and the aeration tank, a third pipe connects the aeration tank and the secondary sedimentation tank, a third pipe connects the secondary sedimentation tank and the anoxic tank, and the secondary sedimentation tank is connected to an effluent pipe.

[0006] Preferably, a variable frequency booster pump is installed between the acidification tank and the anoxic tank.

[0007] Preferably, a sludge return pump is installed between the secondary sedimentation tank and the anoxic tank.

[0008] Preferably, a stirring mechanism is mounted on the top of the anoxic pool.

[0009] Preferably, the stirring mechanism includes a stirring frame, on which a stirring motor is mounted. The output shaft of the stirring motor extends downward, and a rotating disk is fixed on the output shaft of the stirring motor. The outer ring of the rotating disk is provided with a ring of teeth, and a stirring shaft is meshed with the outer edge of the rotating disk. The lower ends of the stirring shaft and the output shaft are connected by a connecting rod. A support frame for supporting the stirring shaft is provided on the stirring frame, and a spherical stirring end is provided at the bottom of the stirring shaft.

[0010] Compared with the prior art, the present invention has the following beneficial effects: the denitrification device for papermaking wastewater can enhance the environmental water treatment capacity, reduce the risk of environmental pollution, and stabilize production operation. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0012] Figure 2 This is a schematic diagram of the stirring mechanism according to an embodiment of the present invention.

[0013] Figure 3 This is a schematic diagram of the connecting rod in an embodiment of the present utility model.

[0014] The markings in the diagram are: 1. Acidification tank; 2. Anoxic tank; 3. Aeration tank; 4. Secondary sedimentation tank; 5. Variable frequency lift pump; 6. Sludge return pump; 7. Mixing frame; 8. Mixing motor; 9. Rotary disc; 10. Mixing shaft; 11. Connecting rod; 12. Support frame; 13. Spherical mixing end. Detailed Implementation

[0015] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0016] like Figures 1-3 As shown, a device for denitrification of papermaking wastewater includes an acidification tank 1, an anoxic tank 2, an aeration tank 3, and a secondary sedimentation tank 4. A first pipe connects the acidification tank 1 and the anoxic tank 2, a second pipe connects the anoxic tank 2 and the aeration tank 3, a third pipe connects the aeration tank 3 and the secondary sedimentation tank 4, a third pipe connects the secondary sedimentation tank 4 and the anoxic tank 2, and the secondary sedimentation tank 4 is connected to an effluent pipe.

[0017] In this embodiment, a stirring mechanism is mounted on the top of the anoxic pool 2.

[0018] In this embodiment, the stirring mechanism includes a stirring frame 7, on which a stirring motor 8 is mounted. The output shaft of the stirring motor 8 extends downward, and a rotating disk 9 is fixed on the output shaft of the stirring motor 8. The outer ring of the rotating disk 9 is provided with a ring of teeth. A stirring shaft 10 is meshed with the outer edge of the rotating disk 9. The lower end of the stirring shaft 10 and the output shaft are connected by a connecting rod 11. A support frame 12 for supporting the stirring shaft 10 is provided on the stirring frame 7, and a spherical stirring end 13 is provided at the bottom of the stirring shaft 10.

[0019] In this embodiment, a variable frequency booster pump 5 is installed between the acidification tank 1 and the anoxic tank 2.

[0020] In this embodiment, a sludge return pump 6 is installed between the secondary sedimentation tank 4 and the anoxic tank 2.

[0021] In this embodiment, each of the pipes is equipped with a flow meter and a control valve.

[0022] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes, and alterations made by those skilled in the art to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall be within the scope of the present utility model.

Claims

1. A device for denitrifying papermaking wastewater, characterized in that: It includes an acidification tank, an anoxic tank, an aeration tank, and a secondary sedimentation tank. A first pipe connects the acidification tank and the anoxic tank, a second pipe connects the anoxic tank and the aeration tank, a third pipe connects the aeration tank and the secondary sedimentation tank, a third pipe connects the secondary sedimentation tank and the anoxic tank, and the secondary sedimentation tank is connected to an effluent pipe.

2. The apparatus for denitrification of papermaking wastewater according to claim 1, characterized in that: A variable frequency booster pump is installed between the acidification tank and the anoxic tank.

3. The apparatus for denitrification of papermaking wastewater according to claim 1, characterized in that: A sludge return pump is installed between the secondary sedimentation tank and the anoxic tank.

4. The apparatus for denitrification of papermaking wastewater according to claim 1, characterized in that: A stirring mechanism is mounted on top of the anoxic pool.

5. The apparatus for denitrification of papermaking wastewater according to claim 4, characterized in that: The stirring mechanism includes a stirring frame, on which a stirring motor is mounted. The output shaft of the stirring motor extends downward, and a rotating disk is fixed on the output shaft of the stirring motor. The outer ring of the rotating disk is provided with a ring of teeth, and a stirring shaft is meshed with the outer edge of the rotating disk. The lower ends of the stirring shaft and the output shaft are connected by a connecting rod. A support frame for supporting the stirring shaft is provided on the stirring frame, and a spherical stirring end is provided at the bottom of the stirring shaft.

Images