Ferric sulfide autotrophic denitrification coupling nitrogen removal system

Abstract

The utility model discloses a pyrite autotrophic denitrification coupling denitrification system which comprises a biological treatment unit, a physical filtering unit, a primary oxidation unit and a deep oxidation unit, wherein wastewater sequentially passes through the biological treatment unit, the physical filtering unit, the primary oxidation unit and the deep oxidation unit through pipelines. The biological treatment unit comprises a biological reaction tank and a sedimentation tank, the sedimentation tank is communicated with the bottom of the biological reaction tank through a water inlet pipe, a ceramsite layer, a sulfur autotrophic layer, a ferrous sulfide layer and a suspended filler layer are sequentially arranged in the biological reaction tank from bottom to top, a water return pipe is arranged at the upper part of the biological reaction tank, and the other end of the water return pipe is communicated with the sedimentation tank. According to the system, a biological method, a physical method and a chemical method are comprehensively used, so that the nitrogen content and indissolvable substances in the wastewater are effectively reduced, the drug feeding amount is reduced, and the wastewater treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a ferrosulphur autotrophic denitrification coupled denitrification system. Background Art

[0002] In recent years, with the continuous expansion of the scale of production in my country's aquaculture industry, the amount of feces and wastewater generated has also increased significantly, and a series of environmental problems caused by this are also attracting people's attention. Poultry and livestock breeding wastewater is a kind of organic wastewater with relatively complex components. High organic compound content and high ammonia phosphorus content are its main water quality characteristics. In addition, the wastewater is dark black, has a strong pungent odor, and contains a large amount of insoluble suspended solids, which also makes it difficult to treat. Due to the good biodegradability of aquaculture wastewater, anaerobic and aerobic combined processes are generally used for biochemical treatment to remove organic matter and nitrogen and phosphorus. However, due to the presence of some soluble and difficult-to-degrade substances in the wastewater, biochemical methods are also difficult to further remove. Although this part of the substance accounts for a small proportion, it is difficult to meet the increasingly stringent emission standards. At present, the chemical dosing method is used. Although the effect is better and the effluent can stably meet the standards, there are also problems with large dosage and sludge production, and the cost of dosing accounts for a large proportion in the treatment of aquaculture wastewater. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a ferrosulphur autotrophic denitrification coupled denitrification system.

[0004] The technical solution of the utility model is: a ferrosulphide autotrophic denitrification coupled denitrification system includes a biological treatment unit, a physical filtration unit, a preliminary oxidation unit and a deep oxidation unit, and wastewater passes through the biological treatment unit, the physical filtration unit, the preliminary oxidation unit and the deep oxidation unit in sequence through a pipeline. The biological treatment unit includes a biological reaction tank and a sedimentation tank, and the sedimentation tank is connected to the bottom of the biological reaction tank through an inlet pipe. The interior of the biological reaction tank is provided with a ceramsite layer, a sulfur autotrophic layer, a ferrosulphide layer and a suspended filler layer from bottom to top, and a return pipe is provided on the upper part of the biological reaction tank, and the other end of the return pipe is connected to the sedimentation tank.

[0005] Furthermore, the bioreactor is provided with an online pH detector, the water inlet pipe is provided with a solenoid valve, and the online pH detector is electrically connected to the solenoid valve.

[0006] Furthermore, a mud discharge valve is provided at the bottom of the sedimentation tank.

[0007] Furthermore, the physical filtration unit includes a secondary sedimentation tank, in which an MBR ceramic membrane is arranged.

[0008] Furthermore, there is an aeration device at the bottom of the secondary sedimentation tank, and it is also equipped with an automatic backwashing and chemical washing system.

[0009] Furthermore, the preliminary oxidation unit includes a primary ozone tank, in which a catalyst layer and an activated carbon layer are sequentially arranged.

[0010] Furthermore, the deep oxidation unit comprises a deep ozone tank, an aeration system is provided at the bottom of the deep ozone tank, and a curtain filler is provided at the top of the deep ozone tank.

[0011] Compared with the prior art, the utility model has the advantages of: comprehensively using biological, physical and chemical methods to achieve multi-level treatment of difficult-to-degrade organic matter in wastewater, effectively reducing the use of chemical agents and reducing the cost of wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Among them: 1. biological reaction tank; 2. first water pump; 3. secondary sedimentation tank; 4. primary ozone tank; 5. deep ozone tank; 41. catalyst layer; 42. activated carbon layer; 51. curtain filler; 11. ceramsite layer; 12. sulfur autotrophic layer; 13. sulfide iron layer; 14. suspended filler layer; 15. clear water area; 16. online pH detector; 17. return pipe; 18. water inlet pipe; 19. sedimentation tank; 21. second water pump; 22. solenoid valve; 191. mud discharge valve. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0016] The specific implementation of the utility model will be described below in conjunction with the accompanying drawings:

[0017] like Figure 1As shown, a sulfide-iron autotrophic denitrification coupled denitrification system includes a biological treatment unit, a physical filtration unit, a preliminary oxidation unit and a deep oxidation unit. Wastewater passes through the biological treatment unit, the physical filtration unit, the preliminary oxidation unit and the deep oxidation unit in sequence through a pipeline. The insoluble organic matter in the wastewater is treated by a comprehensive use of biological, physical and chemical methods, which reduces the additional chemical drugs and reduces the cost of wastewater treatment. The biological treatment unit includes a bioreactor 1 and a sedimentation tank 19. The sedimentation tank 19 is connected to the bottom of the bioreactor 1 through an inlet pipe 18. The interior of the bioreactor 1 is provided with a ceramsite layer 11, a sulfur autotrophic layer 12, a sulfide-iron layer 13 and a suspended filler layer from bottom to top. The ceramsite layer 11 filters out fixed particles, and the sulfur autotrophic layer 12 and the sulfide-iron layer 13 reduce the nitrogen content in the wastewater through the action of sulfide-iron autotrophic denitrification. It has the advantages of stable chemical properties, strong corrosion resistance, long-term use, low maintenance cost, energy saving and environmental protection. Suspended fillers can provide a large amount of biological attachment area, promote the growth and reproduction of microorganisms, and achieve efficient degradation and removal of organic matter in water bodies.

[0018] The bioreactor 1 is provided with an online pH detector 16, and a solenoid valve 22 is provided on the water inlet pipe 18, and the online pH detector 16 is electrically connected to the solenoid valve 22. The process of pyrite autotrophic denitrification has an optimal pH range, so the online pH detector 16 is required to monitor the change of pH value in the bioreactor 1 in real time. The online pH detector 16 transmits a signal to the solenoid valve 22, and the solenoid valve 22 controls the amount of wastewater entering the bioreactor 1 to achieve balanced control of the pH value of the bioreactor 1. The water inlet pipe 18 is provided with a first water pump 2, and the first water pump 2 pumps wastewater from the sedimentation tank 19 into the bioreactor.

[0019] In the sedimentation tank 19, the larger particles of insoluble matter are deposited at the bottom of the sedimentation tank 19. A return pipe 17 is provided at the top of the bioreactor 1, one end of which is connected to the clean water area 15 at the top of the bioreactor 1, and the other end is connected to the sedimentation tank 19. The bioreactor 1 can circulate the water in the sedimentation tank 19 to improve the degree of purification of the wastewater by the biological treatment unit. A mud discharge valve 191 is provided at the bottom of the sedimentation tank 19, and the mud discharge valve 191 is used to clean the sludge accumulated at the bottom of the sedimentation tank 19.

[0020] The physical filtration unit includes a secondary sedimentation tank 3, in which an MBR ceramic membrane is provided. In the secondary sedimentation tank 3, fine suspended solids and some macromolecular substances in the wastewater are further removed by filtering through the MBR ceramic membrane. An aeration device is provided at the bottom of the secondary sedimentation tank 3, and an automatic backwashing and drug washing system is also provided. The aeration device and the automatic backwashing and drug washing system are used to prevent the MBR ceramic membrane from being blocked, thereby ensuring the cleanliness of the MBR ceramic membrane. A second water pump 21 is provided between the sedimentation tank 19 and the secondary sedimentation, and the second water pump 21 discharges the wastewater from the sedimentation tank 19 to the secondary sedimentation tank 3.

[0021] The preliminary oxidation unit includes a primary ozone tank 4, in which a catalyst layer 41 and an activated carbon layer 42 are sequentially arranged. After the wastewater enters the primary ozone tank 4 and is fully mixed with ozone, it passes through the catalyst layer 41 and the activated carbon layer 42 in sequence. The catalyst can improve the oxidation efficiency of ozone, and the activated carbon can adsorb the wastewater, remove part of the color and organic matter, and prepare for deep oxidation treatment.

[0022] The deep oxidation unit includes a deep ozone tank 5, an aeration system is provided at the bottom of the deep ozone tank 5, and a curtain filler 51 is provided at the top of the deep ozone tank 5. The aeration system increases the contact area between ozone and wastewater, and uses the strong oxidizing ability of ozone to further oxidize the macromolecular refractory substances in the wastewater into carbon dioxide or carbon-containing small molecules, which is conducive to further biological treatment. The curtain filler 51 provides an attachment area for microorganisms, and uses microorganisms to further degrade carbon-containing small molecules in the wastewater.

[0023] The working principle of the specific implementation of the utility model is as follows: the wastewater in the sedimentation tank 19 enters the bioreactor 1, and the nitrogen content in the wastewater is efficiently reduced through the process of sulfide iron autotrophic denitrification in the bioreactor tube. The second water pump 21 pumps the water purified by the biological treatment unit into the secondary sedimentation tank 3. In the secondary sedimentation tank 3, the wastewater is further filtered out of macromolecular insoluble organic matter after being treated by the MBR ceramic membrane; the wastewater passes through the catalytic layer and the activated carbon layer 42 in the preliminary oxidation unit in turn, and is pretreated for deep oxidation; the deep oxidation unit gives full play to the strong oxidizing property of ozone, and uses the aeration system to increase the contact area between ozone and wastewater, so as to decompose macromolecular insoluble substances in the water body.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "upper", "lower", "left", "right", "front", "rear" and similar expressions used herein are for illustrative purposes only.

[0025] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A ferrosulphur autotrophic denitrification coupled denitrification system, characterized in that: The invention comprises a biological treatment unit, a physical filtration unit, a preliminary oxidation unit and a deep oxidation unit, wherein wastewater passes through the biological treatment unit, the physical filtration unit, the preliminary oxidation unit and the deep oxidation unit in sequence through a pipeline; the biological treatment unit comprises a biological reaction tank (1) and a sedimentation tank (19), wherein the sedimentation tank (19) is connected to the bottom of the biological reaction tank (1) through a water inlet pipe (18), wherein the interior of the biological reaction tank (1) is provided with a ceramsite layer (11), a sulfur autotrophic layer (12), a sulfide iron layer (13) and a suspended filler layer in sequence from bottom to top, and a return pipe (17) is provided at the top of the biological reaction tank (1), wherein the other end of the return pipe (17) is connected to the sedimentation tank (19).

2. The ferrosulphur autotrophic denitrification coupled denitrification system according to claim 1, characterized in that: The bioreactor (1) is provided with an online pH detector (16), the water inlet pipe (18) is provided with an electromagnetic valve (22), and the online pH detector (16) is electrically connected to the electromagnetic valve (22).

3. The ferrosulphur autotrophic denitrification coupled denitrification system according to claim 1, characterized in that: A mud discharge valve (191) is provided at the bottom of the sedimentation tank (19).

4. The ferrosulphur autotrophic denitrification coupled denitrification system according to claim 1, characterized in that: The physical filtration unit comprises a secondary sedimentation tank (3), in which an MBR ceramic membrane is arranged.

5. The ferrosulphur autotrophic denitrification coupled denitrification system according to claim 4, characterized in that: The bottom of the secondary sedimentation tank (3) is provided with an aeration device and is also equipped with an automatic backwashing and chemical washing system.

6. The ferrosulphur autotrophic denitrification coupled denitrification system according to claim 1, characterized in that: The preliminary oxidation unit comprises a primary ozone tank (4), wherein a catalyst layer (41) and an activated carbon layer (42) are sequentially arranged in the primary ozone tank (4).

7. The ferrosulphur autotrophic denitrification coupled denitrification system according to claim 1, characterized in that: The deep oxidation unit comprises a deep ozone tank (5), the bottom of the deep ozone tank (5) is provided with an aeration system, and the upper part of the deep ozone tank (5) is provided with a curtain-type filler (51).

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