Nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater

Abstract

The utility model discloses a nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater, and relates to a coal pyrolysis wastewater hydrolysis device. The utility model aims to solve the problems that the existing anaerobic hydrolysis biological treatment device is poor in mixing effect and an anaerobic hydrolysis treatment system is easily damaged by adopting anaerobic biogas reflux stirring. The nitrogen stirring anaerobic hydrolysis device for the coal pyrolysis wastewater consists of a reflux water mixer and a hydrolysis device, a nitrogen stirring area, an anaerobic hydrolysis area, a mud-water separation area and a water outlet area are arranged in the hydrolysis device; nitrogen is adopted for stirring, so that the organic matter degradation efficiency of anaerobic hydrolysis microorganisms can be fully exerted, the negative influence of non-uniform stirring in the coal pyrolysis wastewater is avoided, and dissolved gases such as dissolved oxygen, H2, free ammonia, H2S and CO2 and part of volatile organic compounds in the wastewater are separated from the system; the inevitable harm caused by the inhibition effect on anaerobic hydrolysis microorganisms is reduced, and the dual effects of maintaining a good anaerobic hydrolysis treatment environment and reducing the treatment load are achieved.

Description

Technical Field

[0001] The utility model relates to a nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater. Background Technique

[0002] The production process of coal pyrolysis is numerous and complex, and a large amount of wastewater with complex water quality will be generated. The wastewater contains both refractory organic matters such as benzene compounds, phenolic compounds, pyridine, carbazole, biphenyl, and oil, and at the same time contains inorganic pollutants such as cyanide, sulfide, and ammonia nitrogen that inhibit the proliferation of microorganisms. It is a typical high-concentration toxic and harmful, refractory industrial wastewater.

[0003] Anaerobic hydrolysis biological treatment has many advantages such as low energy consumption and high organic load. At present, it is commonly used for the treatment of refractory high-concentration organic wastewater, and the anaerobic hydrolysis treatment process is usually regarded as an important biological treatment stage.

[0004] In anaerobic hydrolysis biological treatment, the mixing effect of the incoming wastewater and the internal anaerobic hydrolysis microorganisms directly affects the operation effect. At present, the method of anaerobic hydrolysis effluent reflux is mostly used to increase the upward flow rate in the anaerobic device to achieve the purpose of stirring. However, the co-directional flow state of the reflux water and the influent often results in poor mixing effect. Some researchers use anaerobic biogas reflux stirring. Although the purpose of stirring can be achieved, it will cause H2S, H2, CO2, etc. to re-enter the reaction system, resulting in inevitable harm. Content of the Utility Model

[0005] The utility model aims to solve the problems of poor mixing effect of the existing anaerobic hydrolysis biological treatment device and the easy harm to the anaerobic hydrolysis treatment system caused by using anaerobic biogas reflux stirring, and provides a nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater.

[0006] The nitrogen-stirred anaerobic hydrolysis device for coal pyrolysis wastewater of the utility model consists of a reflux water mixer (1) and a hydrolysis device; a nitrogen-stirring area (2), an anaerobic hydrolysis area (3) and a mud-water separation area (4) are arranged inside the hydrolysis device, the mud-water separation area (4) is arranged at the upper part of the anaerobic hydrolysis area (3), the nitrogen-stirring area (2) is arranged at the lower part of the anaerobic hydrolysis area (3), and an annular water outlet area (5) is arranged at the upper port of the mud-water separation area (4); a nitrogen nozzle and a water distribution pipeline are arranged inside the nitrogen-stirring area (2), and the nitrogen nozzle in the nitrogen-stirring area (2) is connected with a nitrogen gas source through a nitrogen gas pipe (12); the reflux water mixer (1) is arranged outside the hydrolysis device, the water outlet of the reflux water mixer (1) is connected with a water suction pipe (10), the water outlet end of the water suction pipe (10) is connected with the water inlet of a water pump (7), and the water outlet of the water pump (7) is connected with the water distribution pipeline inside the nitrogen-stirring area (2) through a pressure water pipe (11); the water outlet area (5) is provided with a reflux water outlet and a wastewater outlet, and the reflux water outlet of the water outlet area (5) is connected with the water inlet of the reflux water mixer (1) through a reflux pipe (13).

[0007] During the operation of the nitrogen-stirred anaerobic hydrolysis device for coal pyrolysis wastewater of the utility model, the coal pyrolysis wastewater to be treated enters the reflux water mixer (1) through a water inlet pipe (8), and then sequentially passes through the nitrogen-stirring area (2), the anaerobic hydrolysis area (3), the mud-water separation area (4) and the annular water outlet area (5). In the reflux water mixer (1), the reflux water generated in the annular water outlet area (5) and the coal pyrolysis wastewater are rapidly mixed. The wastewater is lifted into the nitrogen-stirring area (2) by a water pump (7). In the nitrogen-stirring area (2), the incoming wastewater is fully mixed and reacted with the original wastewater and anaerobic hydrolysis microorganisms in the anaerobic hydrolysis device, and then enters the anaerobic hydrolysis area (3), where the anaerobic hydrolysis microorganisms rapidly proliferate, and then enters the mud-water separation area (4) for the separation of anaerobic hydrolysis sludge and wastewater. The separated water passes through the water outlet area (5), a part of the water outlet flows back into the reflux water mixer (1), and the other part of the water outlet is discharged. The separated sludge sinks back into the anaerobic hydrolysis area (3).

[0008] The utility model organically combines the reflux water mixer (1), the nitrogen-stirring area (2), the anaerobic hydrolysis area (3), the mud-water separation area (4) and the water outlet area (5), and uses nitrogen for stirring, which not only plays a role in stirring to fully mix the mud and water, but also can give full play to the efficiency of anaerobic hydrolysis microorganisms in degrading organic matter, and can avoid the negative impact of uneven stirring in coal pyrolysis wastewater, so that dissolved gases such as dissolved oxygen, H2, free ammonia, H2S, CO2 and some volatile organic compounds in the wastewater are separated from the system, reducing the inevitable harm caused by the inhibitory effect of harmful gases on anaerobic hydrolysis microorganisms, achieving the dual effects of maintaining a good anaerobic hydrolysis treatment environment and reducing the treatment load, and creating good conditions for subsequent biochemical treatment. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the nitrogen-stirred anaerobic hydrolysis device for coal pyrolysis wastewater in Embodiment 1. Detailed Embodiments

[0010] The technical solution of the present utility model is not limited to the following specific embodiments listed, and also includes any reasonable combination between the specific embodiments.

[0011] Detailed Embodiment 1: The nitrogen-stirred anaerobic hydrolysis device for coal pyrolysis wastewater in this embodiment consists of a reflux water mixer (1) and a hydrolysis device; a nitrogen stirring zone (2), an anaerobic hydrolysis zone (3), and a sludge-water separation zone (4) are arranged inside the hydrolysis device. The sludge-water separation zone (4) is arranged above the anaerobic hydrolysis zone (3), the nitrogen stirring zone (2) is arranged below the anaerobic hydrolysis zone (3), and an annular water outlet zone (5) is arranged at the upper port of the sludge-water separation zone (4); a nitrogen nozzle and a water distribution pipe are arranged inside the nitrogen stirring zone (2), and the nitrogen nozzle in the nitrogen stirring zone (2) is connected to a nitrogen gas source through a nitrogen gas pipe (12); the reflux water mixer (1) is arranged outside the hydrolysis device, the water outlet of the reflux water mixer (1) is connected to a water suction pipe (10), the water outlet end of the water suction pipe (10) is connected to the water inlet of a water pump (7), and the water outlet of the water pump (7) is connected to the water distribution pipe inside the nitrogen stirring zone (2) through a pressure pipe (11); the water outlet zone (5) is provided with a reflux water outlet and a wastewater outlet, and the reflux water outlet of the water outlet zone (5) is connected to the water inlet of the reflux water mixer (1) through a reflux pipe (13).

[0012] This embodiment has the following beneficial effects:

[0013] In this embodiment, the reflux water mixer (1), the nitrogen stirring zone (2), the anaerobic hydrolysis zone (3), the sludge-water separation zone (4), and the water outlet zone (5) are organically combined, and nitrogen is used for stirring, which not only plays a role in stirring to fully mix the sludge and water, but also can give full play to the efficiency of anaerobic hydrolysis microorganisms in degrading organic matter, and can avoid the negative impact of uneven stirring in coal pyrolysis wastewater, so that dissolved gases such as dissolved oxygen, H2, free ammonia, H2S, CO2 and some volatile organic compounds in the wastewater are separated from the system, reducing the inhibitory effect of harmful gases on anaerobic hydrolysis microorganisms and causing inevitable harm, achieving the dual effects of maintaining a good anaerobic hydrolysis treatment environment and reducing the treatment load, and creating good conditions for subsequent biochemical treatment.

[0014] Detailed Embodiment 2: The difference between this embodiment and Detailed Embodiment 1 is that the wastewater outlet of the water outlet zone (5) at the upper port of the sludge-water separation zone (4) is connected to a water outlet pipe (14).

[0015] Specific Embodiment 3: The difference between this embodiment and Specific Embodiment 1 or 2 is that a water inlet pipe (8) and a sulfuric acid dosing pipe (9) are provided on the reflux water mixer (1).

[0016] Specific Embodiment 4: The difference between this embodiment and any one of Specific Embodiments 1 to 3 is that the nitrogen nozzles in the nitrogen stirring zone (2) are arranged below the water distribution pipe.

[0017] Specific Embodiment 5: The difference between this embodiment and any one of Specific Embodiments 1 to 4 is that the number of nozzles per square meter in the nitrogen stirring zone (2) is not less than 1.

[0018] Specific Embodiment 6: The difference between this embodiment and any one of Specific Embodiments 1 to 5 is that a nitrogen gas distribution pipe is provided in the nitrogen stirring zone (2), the nitrogen nozzles are arranged on the nitrogen gas distribution pipe, and the nitrogen gas distribution pipe is connected to a nitrogen gas pipe (12).

[0019] Specific Embodiment 7: The difference between this embodiment and any one of Specific Embodiments 1 to 6 is that an adjustable speed paddle mixer (6) is provided on the reflux water mixer (1).

[0020] Specific Embodiment 8: The difference between this embodiment and any one of Specific Embodiments 1 to 7 is that anaerobic fillers are provided in the anaerobic hydrolysis zone (3).

[0021] Specific Embodiment 9: The difference between this embodiment and any one of Specific Embodiments 1 to 8 is that the anaerobic hydrolysis zone (3) is a suspended type anaerobic filler.

[0022] Specific Embodiment 10: The difference between this embodiment and any one of Specific Embodiments 1 to 9 is that the volume of the anaerobic hydrolysis zone (3) is 50% - 60% of the volume of the anaerobic device.

[0023] Example 1:

[0024] The nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater of this embodiment is composed of a reflux water mixer (1) and a hydrolysis device; the hydrolysis device is provided with a nitrogen stirring zone (2), an anaerobic hydrolysis zone (3) and a mud-water separation zone (4), the mud-water separation zone (4) is arranged at the upper part of the anaerobic hydrolysis zone (3), the nitrogen stirring zone (2) is arranged at the lower part of the anaerobic hydrolysis zone (3), and the upper port of the mud-water separation zone (4) is provided with an annular water outlet zone (5); a nitrogen nozzle and a water distribution pipeline are arranged inside the nitrogen stirring zone (2), and the nitrogen nozzle in the nitrogen stirring zone (2) is connected to a nitrogen gas source through a nitrogen pipe (12); the reflux water mixer (1) is provided with a nitrogen nozzle (2) and a water distribution pipeline; ... The reflux water mixer (1) is arranged outside the hydrolysis device, the water outlet of the reflux water mixer (1) is connected to a water suction pipe (10), the water outlet end of the water suction pipe (10) is connected to the water inlet of a water pump (7), and the water outlet of the water pump (7) is connected to the water distribution pipeline inside the nitrogen stirring zone (2) through a pressure water pipe (11); the reflux water mixer (1) is provided with a water inlet pipe (8) and a sulfuric acid addition pipe (9); the sulfuric acid addition pipe (9) is used to adjust the pH value; the water outlet zone (5) is provided with a reflux water outlet and a wastewater outlet, the reflux water outlet of the water outlet zone (5) is connected to the water inlet of the reflux water mixer (1) through a reflux pipe (13); the wastewater outlet is connected to a water outlet pipe (14).

[0025] The nitrogen nozzle in the nitrogen stirring zone (2) is arranged below the water distribution pipeline; the number of nozzles per square meter is not less than 1; a nitrogen distribution pipeline is arranged in the nitrogen stirring zone (2), the nitrogen nozzle is arranged on the nitrogen distribution pipeline, and the nitrogen distribution pipeline is connected to the nitrogen pipe (12); after the coal pyrolysis wastewater in the reflux water mixer (1) is evenly mixed, it is lifted by a water pump (7) and enters the nitrogen stirring zone (2) through a pressurized water pipeline (11); the nitrogen distribution pipeline is evenly arranged at the bottom of the nitrogen stirring zone (2), the nitrogen nozzle is arranged on the nitrogen distribution pipeline, and nitrogen is sprayed out through the nozzle for stirring, and the flow rate of the nozzle is 0.2-1.0 m / s. The sprayed nitrogen rises to the liquid surface and escapes from the top of the hydrolysis device. The nitrogen plays a stirring role, fully mixing the mud and water, and making the dissolved oxygen, H2, free ammonia, H2S, CO2 and other dissolved gases and some volatile organic matter in the wastewater leave the system without reducing the inhibitory effect of dissolved oxygen and free ammonia on anaerobic hydrolysis microorganisms. As an inert gas, nitrogen will not react with the solution, avoiding the pollutants brought by biogas stirring to re-enter the system and cause secondary pollution, and also avoiding the dissolved oxygen stirred by air affecting the growth of anaerobic hydrolysis microorganisms. The number of nozzles set in the nitrogen stirring area (2) through the gas distribution pipeline is ≥1 / m 2 .

[0026] An adjustable-speed paddle mixer (6) is provided on the reflux water mixer (1). The coal pyrolysis wastewater, reflux water entering the reflux water mixer (1), and sulfuric acid added through the dosing pipe are fully mixed under the action of the paddle mixer (6). The dosage of sulfuric acid is related to the pH value of the coal pyrolysis wastewater. The pH value of the reflux water mixer (1) is maintained at 6.5 - 7.2, the hydraulic retention time of the reflux water mixer (1) is 30 - 60 min, and the amount of refluxed wastewater is 50 - 100% of the amount of coal pyrolysis wastewater.

[0027] Anaerobic fillers are provided in the anaerobic hydrolysis zone (3), and the volume of the anaerobic hydrolysis zone (3) is 50% - 60% of the volume of the anaerobic device. In the anaerobic hydrolysis zone (3), the microorganisms attached to the anaerobic fillers are in full contact with the coal pyrolysis wastewater under the agitation of nitrogen, strengthening the anaerobic hydrolysis effect. The free acids (acetic acid + propionic acid + butyric acid) and the generated gas produced by the microorganisms are separated from the anaerobic fillers, which is more conducive to the proliferation of anaerobic hydrolysis microorganisms. The agitation of nitrogen can strengthen the anaerobic hydrolysis microorganisms and improve the removal efficiency of biodegradable organic matter.

[0028] During the operation of the nitrogen-agitated anaerobic hydrolysis device for coal pyrolysis wastewater of the present utility model, the coal pyrolysis wastewater to be treated enters the reflux water mixer (1) through the water inlet pipe (8), and then successively passes through the nitrogen agitation zone (2), anaerobic hydrolysis zone (3), mud-water separation zone (4), and annular water outlet zone (5). In the reflux water mixer (1), the reflux water generated in the annular water outlet zone (5) and the coal pyrolysis wastewater are rapidly mixed. The wastewater is lifted into the nitrogen agitation zone (2) by a water pump (7). In the nitrogen agitation zone (2), the incoming wastewater is fully mixed and reacted with the original wastewater and anaerobic hydrolysis microorganisms in the anaerobic hydrolysis device, and then enters the anaerobic hydrolysis zone (3). The anaerobic hydrolysis microorganisms rapidly proliferate, and then enter the mud-water separation zone (4) for the separation of anaerobic hydrolysis sludge and wastewater. The separated effluent passes through the water outlet zone (5). A part of the effluent is refluxed into the reflux water mixer (1), and the other part of the effluent is discharged. The separated sludge sinks back into the anaerobic hydrolysis zone (3). The present utility model organically combines the reflux water mixer (1), nitrogen agitation zone (2), anaerobic hydrolysis zone (3), mud-water separation zone (4), and water outlet zone (5), and uses nitrogen for agitation, which not only plays the role of agitation to fully mix the mud and water, but also can give full play to the efficiency of anaerobic hydrolysis microorganisms in degrading organic matter, and can avoid the negative impact of uneven agitation in coal pyrolysis wastewater, enabling dissolved gases such as dissolved oxygen, H2, free ammonia, H2S, CO2 and some volatile organic compounds in the wastewater to escape from the system, reducing the inhibitory effect of harmful gases on anaerobic hydrolysis microorganisms and causing inevitable harm, achieving the dual effects of maintaining a good anaerobic hydrolysis treatment environment and reducing the treatment load, and creating good conditions for subsequent biochemical treatment.

Claims

1. A nitrogen-stirred anaerobic hydrolysis device for coal pyrolysis wastewater, characterized in that: The nitrogen-stirred anaerobic hydrolysis device for coal pyrolysis wastewater consists of a reflux water mixer (1) and a hydrolysis device; inside the hydrolysis device, there are a nitrogen stirring zone (2), an anaerobic hydrolysis zone (3), and a sludge-water separation zone (4). The sludge-water separation zone (4) is arranged above the anaerobic hydrolysis zone (3), the nitrogen stirring zone (2) is arranged below the anaerobic hydrolysis zone (3), and an annular water outlet zone (5) is arranged at the upper port of the sludge-water separation zone (4); inside the nitrogen stirring zone (2), there are nitrogen nozzles and a water distribution pipeline. The nitrogen nozzles in the nitrogen stirring zone (2) are connected to a nitrogen gas source through a nitrogen gas pipe (12); the reflux water mixer (1) is arranged outside the hydrolysis device. The water outlet of the reflux water mixer (1) is connected to a water suction pipe (10), the water outlet end of the water suction pipe (10) is connected to the water inlet of a water pump (7), and the water outlet of the water pump (7) is connected to the water distribution pipeline inside the nitrogen stirring zone (2) through a pressure water pipe (11); the water outlet zone (5) is provided with a reflux water outlet and a wastewater outlet. The reflux water outlet of the water outlet zone (5) is connected to the water inlet of the reflux water mixer (1) through a reflux pipe (13).

2. The nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater according to claim 1, characterized in that: The wastewater outlet of the water outlet zone (5) at the upper port of the sludge-water separation zone (4) is connected to a water outlet pipe (14).

3. The nitrogen-stirred anaerobic hydrolysis device for coal pyrolysis wastewater according to claim 1, characterized in that: The reflux water mixer (1) is provided with a water inlet pipe (8) and a sulfuric acid dosing pipe (9).

4. The nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater according to claim 1, characterized in that: The nitrogen nozzles in the nitrogen stirring zone (2) are arranged below the water distribution pipeline.

5. The nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater according to claim 1, characterized in that: The number of nozzles per square meter in the nitrogen stirring zone (2) is not less than 1.

6. The nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater according to claim 1, wherein: A nitrogen gas distribution pipeline is arranged inside the nitrogen stirring zone (2). The nitrogen nozzles are arranged on the nitrogen gas distribution pipeline, and the nitrogen gas distribution pipeline is connected to the nitrogen gas pipe (12).

7. The nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater according to claim 1, characterized in that: The reflux water mixer (1) is provided with an adjustable-speed paddle mixer (6).

8. The nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater according to claim 1, characterized in that: Anaerobic fillers are arranged inside the anaerobic hydrolysis zone (3).

9. The nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater according to claim 1, characterized in that: The anaerobic hydrolysis zone (3) is a suspended anaerobic filler.

10. The nitrogen stirring anaerobic hydrolysis device for coal pyrolysis wastewater according to claim 1, characterized in that: The volume of the anaerobic hydrolysis zone (3) is 50%-60% of the volume of the anaerobic device.

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