High-nitrogen digestive juice wastewater treatment system

Abstract

The utility model discloses a high-nitrogen digestive juice wastewater treatment system and relates to the technical field of biological treatment of high-nitrogen digestive juice wastewater. The device comprises a main bioreactor and an alkali liquor storage cylinder positioned at the left side of the main bioreactor, an auxiliary bioreactor is arranged on the right side of the main bioreactor, a sedimentation tank is arranged on the right side of the auxiliary bioreactor, air blowers are arranged right in front of the main bioreactor and the auxiliary bioreactor, and perforated aeration pipe frames are fixedly communicated with the rear parts of the air blowers; sludge pumps are arranged right behind the main bioreactor and the auxiliary bioreactor, a sewage pipeline I communicated with the main bioreactor and the auxiliary bioreactor is arranged between the main bioreactor and the auxiliary bioreactor, and a sewage pipeline II connected with the auxiliary bioreactor and the sedimentation tank is arranged between the auxiliary bioreactor and the sedimentation tank. According to the utility model, the main bioreactor and the auxiliary bioreactor are connected in series and matched for use, so that high-nitrogen digestive juice wastewater can be efficiently and stably treated.

Description

Technical Field

[0001] The utility model belongs to the technical field of biological treatment of high-nitrogen digestate wastewater, and particularly relates to a high-nitrogen digestate wastewater treatment system. Background Technique

[0002] The sludge anaerobic digestion technology has the advantages of energy recovery, effective reduction, etc., and is widely used in sludge stabilization treatment. The high-nitrogen digestate wastewater generated has the characteristics of a low carbon-nitrogen ratio, usually less than 5:1, a total nitrogen as high as more than 1000 mg / L, and high biological toxicity.

[0003] However, traditional biological treatment methods usually adopt the treatment method of one-stage anoxic + one-stage aerobic + two-stage anoxic + two-stage aerobic, and gradually reduce the total nitrogen concentration through multi-stage biological treatment. The carbon source carried by the influent is lost greatly during the multi-stage transfer, and a large amount of additional carbon source often needs to be added for denitrification and nitrogen removal at the second-stage anoxic. The traditional biological treatment method requires many structures, many devices, high energy consumption, high carbon source chemical agent cost, unstable operation, and requires a large proportion of nitrified liquid reflux, and the operation control is complex. Therefore, we provide a high-nitrogen digestate wastewater treatment system and treatment method to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a high-nitrogen digestate wastewater treatment system, which can efficiently and stably treat high-nitrogen digestate wastewater through the series connection and cooperation of a main biological reactor and an auxiliary biological reactor.

[0005] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0006] The utility model is a high-nitrogen digestate wastewater treatment system, including a main biological reactor and an alkali solution storage cylinder located at its directly left position; an auxiliary biological reactor is arranged at the directly right position of the main biological reactor, a sedimentation tank is arranged at the directly right position of the auxiliary biological reactor, blowers are arranged in front of both the main biological reactor and the auxiliary biological reactor, perforated aeration pipe racks are fixedly connected to the rear of the blowers, and the two perforated aeration pipe racks are respectively fixed in the adjacent main biological reactor and auxiliary biological reactor. Sludge pumps are arranged at the directly rear positions of the main biological reactor and the auxiliary biological reactor. A sewage pipeline one that is connected to both of them is arranged between the main biological reactor and the auxiliary biological reactor, and a sewage pipeline two that is connected to both of them is arranged between the auxiliary biological reactor and the sedimentation tank.

[0007] The utility model is further arranged such that a chemical dosing pump that is internally connected to it is fixed on the upper end surface of the alkali solution storage cylinder, and a chemical dosing pipeline that is connected to the middle position of the sewage pipeline one is fixed at the outlet end of the chemical dosing pump.

[0008] The present utility model is further configured such that a water inlet pipeline connected to the inside thereof is fixed to the peripheral side of the main bioreactor, and a flow meter is fixed in the middle of the water inlet pipeline.

[0009] The present utility model is further configured such that a connecting pipeline is fixedly connected in the middle of the chemical dosing pipeline, the lower end of the connecting pipeline is fixedly connected to the inside of the water inlet pipeline, and the connection between the connecting pipeline and the water inlet pipeline is located to the right of the flow meter.

[0010] The present utility model is further configured such that on-line dissolved oxygen meters, stirrers and on-line pH meters are all fixed to the upper end surfaces of the main bioreactor and the auxiliary bioreactor, and the on-line dissolved oxygen meters, stirrers and on-line pH meters are arranged in sequence from left to right.

[0011] The present utility model is further configured such that a sludge connection pipe one connected to a sludge pump is fixed to the peripheral side of the main bioreactor, and a sludge connection pipe two connected to the sludge pump is fixed to the peripheral side of the auxiliary bioreactor.

[0012] The present utility model is further configured such that both of the two perforated aeration pipe racks are located above the sludge connection pipe one and the sludge connection pipe two, the sewage pipeline one is arranged in a state of being higher on the left and lower on the right, and the right end of the water inlet pipeline is lower than the position below the perforated aeration pipe rack.

[0013] The present utility model is further configured such that a sludge return pipeline is fixed at the sludge outlet position of the sedimentation tank, and the inlet ends of the sludge pumps are all connected to the sludge return pipeline.

[0014] The present utility model has the following beneficial effects:

[0015] The present utility model adopts two bioreactors. The first bioreactor is the main bioreactor, which undergoes shortcut nitrification and denitrification for nitrogen removal and is applicable to the treatment of wastewater in a high nitrogen concentration range. The second reactor is the auxiliary bioreactor, which mainly undergoes shortcut nitrification + endogenous denitrification and is applicable to the treatment of wastewater in a low nitrogen concentration range. The two reactors operate in series, can efficiently and stably treat high nitrogen digestate wastewater, reduce the number of wastewater treatment structures and equipment for this type of wastewater, simplify the wastewater treatment process flow, utilize the technical principles of shortcut nitrification and endogenous denitrification, greatly reduce the energy consumption of equipment operation, and do not require the addition of external carbon sources for nitrogen removal.

[0016] Of course, it is not necessarily required for any product implementing the present utility model to achieve all of the above advantages simultaneously. Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 This is the front view structure diagram of the overall structure in the present utility model.

[0019] Figure 2 This is the rear view of the overall structure in the present utility model.

[0020] Figure 3 This is the front view structure diagram of the main bioreactor and the auxiliary bioreactor in the present utility model.

[0021] Figure 4 This is the rear view structure diagram of the main bioreactor and the auxiliary bioreactor in the present utility model.

[0022] Figure 5 This is the assembly diagram of the sedimentation tank and the sludge pump in the present utility model.

[0023] Figure 6 This is the structure diagram of the lye storage cylinder in the present utility model.

[0024] In the drawings, the list of components represented by each reference numeral is as follows:

[0025] 100 - main bioreactor, 101 - inlet pipeline, 102 - flowmeter, 103 - sewage pipeline 1, 104 - sludge connection 1, 200 - auxiliary bioreactor, 201 - sewage pipeline 2; 202 - sludge connection 2, 300 - sedimentation tank, 301 - sludge return pipeline, 400 - lye storage cylinder, 401 - chemical dosing pump, 402 - chemical dosing pipeline, 403 - connecting pipeline, 500 - blower, 501 - perforated aeration pipe rack, 600 - sludge pump, 700 - on-line dissolved oxygen analyzer, 800 - on-line pH meter, 900 - stirrer. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model. Specific embodiment 1

[0028] Please refer to Figures 1-6, The utility model relates to a high-nitrogen digestate wastewater treatment system, which can efficiently and stably treat high-nitrogen digestate wastewater by the series connection and cooperation of a main bioreactor 100 and an auxiliary bioreactor 200.

[0029] Specifically, there is an alkali solution storage cylinder 400 at the due left position of the main bioreactor 100; an auxiliary bioreactor 200 is arranged at the due right of the main bioreactor 100, a sedimentation tank 300 is arranged at the due right of the auxiliary bioreactor 200, blowers 500 are arranged in front of both the main bioreactor 100 and the auxiliary bioreactor 200, perforated aeration pipe racks 501 are fixedly connected to the rear of the blowers 500, and the two perforated aeration pipe racks 501 are respectively fixed in the adjacent main bioreactor 100 and auxiliary bioreactor 200. Sludge pumps 600 are arranged at the due rear of both the main bioreactor 100 and the auxiliary bioreactor 200. A first sewage pipeline 103 communicating with both is arranged between the main bioreactor 100 and the auxiliary bioreactor 200, and a second sewage pipeline 201 connecting the two is arranged between the auxiliary bioreactor 200 and the sedimentation tank 300.

[0030] The operation process of this embodiment is as follows: By controlling the operation of the blower 500, the blower 500 will aerate the wastewater inside the main bioreactor 100 and the auxiliary bioreactor 200 through the perforated aeration pipe rack 501. At the same time, the main bioreactor 100 and the auxiliary bioreactor 200 are connected in series through the first sewage pipeline 103. Therefore, after the wastewater enters the main bioreactor 100 from the position of the water inlet pipeline 101, the alkali solution in the alkali solution storage cylinder 400 is added to the main bioreactor 100. At this time, the sewage in the main bioreactor 100 will flow into the auxiliary bioreactor 200 through the first sewage pipeline 103, and the alkali solution in the alkali solution storage cylinder 400 is added to the auxiliary bioreactor 200. Thus, through the second sewage pipeline 201, the sewage in the auxiliary bioreactor 200 enters the sedimentation tank 300. The sedimentation tank 300 separates the water and cement from the wastewater, and through the operation of the sludge pump 600, the sludge pump 600 pumps the sludge in the sedimentation tank 300 back into the main bioreactor 100 and the auxiliary bioreactor 200. Specific Embodiment Two

[0032] Please refer to Figure 3 and Figure 6 , on the basis of Specific Embodiment One, through the operation of the flowmeter 102 and the dosing pump 401, it can be realized to accurately add alkali solution by controlling the dosing pump 401 according to the flow rate of the wastewater.

[0033] Specifically, a chemical dosing pump 401 that is internally connected to the upper end face of the lye storage cylinder 400 is fixed. The outlet end of the chemical dosing pump 401 is fixed with a chemical dosing pipeline 402 that is connected to the middle position of the sewage pipeline 103. The periphery of the main bioreactor 100 is fixed with a water inlet pipeline 101 that is internally connected to it. A flow meter 102 is fixed in the middle of the water inlet pipeline 101. The middle of the chemical dosing pipeline 402 is fixedly connected with a connecting pipeline 403. The lower end of the connecting pipeline 403 is fixedly connected to the inside of the water inlet pipeline 101, and the connection between the connecting pipeline 403 and the water inlet pipeline 101 is located to the right of the flow meter 102.

[0034] The operation process of this embodiment is as follows: The flow rate of the wastewater in the water inlet pipeline 101 is detected by the flow meter 102. At the same time, when the chemical dosing pump 401 is working, the chemical dosing pump 401 quickly adds lye to the main bioreactor 100 and the auxiliary bioreactor 200 through the chemical dosing pipeline 402. Specific Embodiment Three

[0036] Please refer to Figure 2 、 Figure 4 and Figure 5 Based on Specific Embodiment One, through the on-line dissolved oxygen meter 700, the stirrer 900 and the on-line pH meter 800, the wastewater environment in the main bioreactor 100 and the auxiliary bioreactor 200 can be accurately controlled.

[0037] Specifically, on-line dissolved oxygen meters 700, stirrers 900 and on-line pH meters 800 are fixed on the upper end faces of the main bioreactor 100 and the auxiliary bioreactor 200, and the on-line dissolved oxygen meters 700, stirrers 900 and on-line pH meters 800 are arranged in sequence from left to right. A sludge connection pipe 104 that is connected to the sludge pump 600 is fixed on the periphery of the main bioreactor 100. A sludge connection pipe that is connected to the sludge pump 600 is fixed on the periphery of the auxiliary bioreactor 200. Both of the two perforated aeration pipe racks 501 are located above the sludge connection pipe 104 and the sludge connection pipe 202. The sewage pipeline 103 is arranged in a state where the left side is high and the right side is low. The right end of the water inlet pipeline 101 is lower than the lower position of the perforated aeration pipe rack 501. A sludge return pipeline 301 is fixed at the sludge outlet position of the sedimentation tank 300. The inlet ends of the sludge pumps 600 are all connected to the sludge return pipeline 301.

[0038] The operation process of this embodiment is as follows: By controlling the operation of the stirrer 900, when the wastewater enters the main bioreactor 100 and the auxiliary bioreactor 200, the stirrer 900 will stir the wastewater in the main bioreactor 100 and the auxiliary bioreactor 200 to facilitate the rapid reaction of the wastewater. At the same time, the on-line pH meter 800 can accurately control the pH value in the main bioreactor 100 and the auxiliary bioreactor, and the on-line dissolved oxygen meter 700 can accurately control the dissolved oxygen concentration in the main bioreactor 100 and the auxiliary bioreactor.

[0039] The present utility model also provides a wastewater treatment method for a high-nitrogen digestate wastewater treatment system, which specifically includes the following steps:

[0040] S1: Inoculate activated sludge in the main bioreactor 100 so that the concentration range of the activated sludge in the main bioreactor 100 is 3000 mg / L to 8000 mg / L;

[0041] S2: After the previous step, continuously introduce the high-nitrogen digestate wastewater into the first bioreactor through the water inlet pipeline 101. At the same time, control the operation of the blower 500, and carry out aeration treatment on the inside of the main bioreactor 100 through the perforated aeration pipe rack 501, and maintain the dissolved oxygen concentration inside the main bioreactor 100 at 0.1 - 0.3 mg / L under the control of the on-line dissolved oxygen meter 700;

[0042] S3: When the dissolved oxygen is greater than 0.3 mg / L, the blower 500 stops aeration, and the stop aeration time is 1 to 1.5 times the aeration duration. This cycle repeats. In addition, the on-line pH meter controls the dosing pump 401 to add the alkali liquid in the alkali liquid storage cylinder 400 into the main bioreactor 100 to adjust the pH in the main bioreactor 100 so that the pH in the main bioreactor 100 is maintained above 8;

[0043] S4: Under the above control conditions, the main bioreactor 100 undergoes a shortcut nitrification reaction during the aeration stage, converting ammonia nitrogen into nitrite nitrogen. The main bioreactor 100 undergoes a shortcut denitrification during the stop aeration stage, and the nitrite nitrogen converted during the aeration stage and the carbon source in the wastewater are subjected to shortcut denitrification for nitrogen removal;

[0044] S5: After the previous step is completed, inoculate activated sludge in the auxiliary bioreactor 200, and the concentration range of the activated sludge is 1500 mg / L to 5000 mg / L. The wastewater treated by the main bioreactor 100 continuously enters the auxiliary bioreactor 200, and the blower 500 maintains the dissolved oxygen concentration in the auxiliary bioreactor 200 at 0.3 - 1 mg / L under the control of the on-line dissolved oxygen meter 700;

[0045] S6: When the dissolved oxygen is greater than 1 mg / L, the blower 500 stops aeration, and the aeration stop time is 1.5 to 2 times the aeration duration. This cycle repeats. In addition, the on-line pH meter controls the dosing pump 401 to add the lye in the lye storage cylinder 400 into the secondary biological reactor 200 to adjust the pH in the biological reactor, so that the pH in the secondary biological reactor 200 is maintained above 7.8;

[0046] S7: Under the above control conditions, the secondary biological reactor 200 undergoes shortcut nitrification reaction during the aeration stage to convert ammonia nitrogen into nitrite nitrogen. The secondary biological reactor 200 undergoes shortcut endogenous denitrification during the aeration stop stage to perform shortcut endogenous denitrification and nitrogen removal on the nitrite nitrogen converted during the aeration stage and the carbon source in the activated sludge cells;

[0047] S8: The shortcut endogenous denitrification and nitrogen removal process completely does not require an external carbon source and uses the carbon source in the activated sludge to achieve denitrification;

[0048] S9: Through the series connection and cooperation of the above main biological reactor 100 and secondary biological reactor 200, the treated effluent carrying activated sludge enters the sedimentation tank 300. The sedimentation tank 300 intercepts the activated sludge at the bottom by natural sedimentation, and the supernatant is discharged from the upper part of the sedimentation tank 300. The bottom activated sludge is returned to the main biological reactor 100 and the secondary biological reactor 200 respectively through the sludge pump 600. The sludge return ratio to the main biological reactor 100 is 100%, and the sludge return ratio to the secondary biological reactor 200 is 50%.

[0049] The present utility model also provides the operation data of the high-nitrogen digestate wastewater treatment method as follows:

[0050]

[0051]

[0052]

[0053] In the table, the influent CODcr is the effluent value after long-term anaerobic digestion, and most of this COD is inert COD and is difficult to biodegrade.

[0054] The total nitrogen removal rate of the method used in the present utility model = (influent TN - effluent TN) / influent TN × 100%;

[0055] The total nitrogen theoretical removal rate of the traditional method = (influent CODcr - effluent CODcr) / 2.9 / influent TN × 100%.

[0056] Among them, 2.9 in the traditional method is the theoretical ratio of carbon to nitrogen required for traditional denitrification and nitrogen removal.

[0057] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0058] The preferred embodiments of the present utility model disclosed above are only used to help explain the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, according to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present utility model, so that those skilled in the relevant technical field can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A high-nitrogen digestate wastewater treatment system, comprising a main bioreactor (100) and an alkali solution storage cylinder (400) located directly to the left of the main bioreactor; characterized in that: An auxiliary bioreactor (200) is arranged directly to the right of the main bioreactor (100), and a sedimentation tank (300) is arranged directly to the right of the auxiliary bioreactor (200). A blower (500) is arranged directly in front of the main bioreactor (100) and the auxiliary bioreactor (200), and a perforated aeration pipe rack (501) is fixedly connected to the rear of the blower (500), and the two perforated aeration pipe racks (501) are respectively fixed near the main bioreactor. In the main bioreactor (100) and the auxiliary bioreactor (200), a sludge pump (600) is arranged directly behind the main bioreactor (100) and the auxiliary bioreactor (200), a sewage pipeline 1 (103) connected to the main bioreactor (100) and the auxiliary bioreactor (200) is arranged between the main bioreactor (100) and the auxiliary bioreactor (200), and a sewage pipeline 2 (201) connected to the auxiliary bioreactor (200) and the sedimentation tank (300) is arranged between the auxiliary bioreactor (200) and the sedimentation tank (300).

2. A high-nitrogen digestate wastewater treatment system according to claim 1, characterized in that: A dosing pump (401) connected to the interior of the alkali solution storage cylinder (400) is fixed on the upper end surface thereof, and a dosing pipeline (402) connected to the middle position of the sewage pipeline (103) is fixed on the outlet end of the dosing pump (401).

3. A high-nitrogen digestate wastewater treatment system according to claim 2, characterized in that: A water inlet pipeline (101) connected to the interior of the main bioreactor (100) is fixed on the circumference of the main bioreactor (100), and a flow meter (102) is fixed in the middle of the water inlet pipeline (101).

4. A high-nitrogen digestate wastewater treatment system according to claim 3, characterized in that: The middle part of the dosing pipeline (402) is fixedly connected with a connecting pipeline (403), the lower end of the connecting pipeline (403) is fixedly connected with the inside of the water inlet pipeline (101), and the connection between the connecting pipeline (403) and the water inlet pipeline (101) is located to the right of the flow meter (102).

5. A high-nitrogen digestate wastewater treatment system according to claim 1, characterized in that: An online dissolved oxygen meter (700), a stirrer (900) and an online pH meter (800) are fixed to the upper end surfaces of the main bioreactor (100) and the auxiliary bioreactor (200), and the online dissolved oxygen meter (700), the stirrer (900) and the online pH meter (800) are arranged in sequence from left to right.

6. A high-nitrogen digestate wastewater treatment system according to claim 3, characterized in that: A sludge connecting pipe 1 (104) connected to the sludge pump (600) is fixed on the peripheral side of the main bioreactor (100), and a sludge connecting pipe 2 connected to the sludge pump (600) is fixed on the peripheral side of the auxiliary bioreactor (200).

7. A high-nitrogen digestate wastewater treatment system according to claim 6, characterized in that: The two perforated aeration pipe racks (501) are both located above the sludge pipe connection 1 (104) and the sludge pipe connection 2 (202), the sewage pipe line 1 (103) is arranged in a state of being higher on the left and lower on the right, and the right end of the water inlet pipe line (101) is lower than the lower position of the perforated aeration pipe rack (501).

8. A high-nitrogen digestate wastewater treatment system according to claim 1, characterized in that: A sludge return pipeline (301) is fixed at the sludge outlet of the sedimentation tank (300), and the inlet end of the sludge pump (600) is connected to the sludge return pipeline (301).

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