System for reducing COD (Chemical Oxygen Demand) and ammonia nitrogen in desulfurization wastewater
Through the combined system of the primary high-density sedimentation tank and the secondary high-density sedimentation tank, dosing and flocculant treatment, the problem of excessive COD and ammonia nitrogen in the desulfurization wastewater was solved, and the effective reuse of the wastewater was achieved.
Patent Information
- Application Number
- CN202422576063.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-10-24
AI Technical Summary
Existing technologies are unable to effectively remove COD and ammonia nitrogen from desulfurization wastewater, resulting in excessive COD and ammonia nitrogen content, which cannot meet the requirements for recycled water quality.
A combined system of a primary high-density sedimentation tank and a secondary high-density sedimentation tank is adopted. By adding ammonia nitrogen removal agents, flocculants and coagulants in the primary high-density sedimentation tank, and adding oxidants, catalysts, flocculants and coagulants in the secondary high-density sedimentation tank, combined with sludge filter press treatment, COD and ammonia nitrogen can be reduced.
Effectively reduce ammonia nitrogen in desulfurization wastewater to less than 25 mg/L and COD to less than 150 mg/L, meeting the requirements for reuse within the plant and improving the level of resource utilization.
Smart Images
Figure CN223445363U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the desulfurization wastewater treatment technical field, and specifically relates to a system for reducing COD and ammonia nitrogen of desulfurization wastewater. BACKGROUND
[0002] Desulfurization wastewater is wastewater generated in the process of flue gas desulfurization, and contains a large amount of inorganic salts such as sodium, calcium, magnesium, ammonia nitrogen, fluoride ions, chloride ions and sulfate radicals, as well as organic pollutants.
[0003] Desulfurization wastewater is usually treated by a triple tank + clarifier or an integrated device to remove heavy metals and suspended solids in the desulfurization wastewater, and all the treated wastewater is reused in the plant. However, the conventional process does not have the ability to remove COD and ammonia nitrogen, which often leads to excessive COD and ammonia nitrogen, and cannot meet the water quality requirements of the reused water. UTILITY MODEL CONTENT
[0004] To solve the problems of the prior art, the utility model provides a system for reducing COD and ammonia nitrogen of desulfurization wastewater. Through the utility model, COD and ammonia nitrogen can be removed from desulfurization wastewater.
[0005] The technical scheme provided by the utility model is as follows:
[0006] A system for reducing COD and ammonia nitrogen of desulfurization wastewater, at least comprising a first-stage feedwater pump, a first-stage high-density sedimentation tank, an intermediate water tank, a second-stage feedwater pump, a second-stage high-density sedimentation tank and a clean water tank which are sequentially connected.
[0007] Based on the above technical scheme, the combination of the first-stage high-density sedimentation tank and the second-stage high-density sedimentation tank can reduce the ammonia nitrogen and COD of the desulfurization wastewater.
[0008] Specifically, on the first-stage high-density sedimentation tank, an ammonia nitrogen removal medicament feeder, a first flocculant feeder and a first coagulant feeder are sequentially connected along the material flow direction.
[0009] Specifically, the first-stage high-density sedimentation tank has a first tank body, and the first tank body comprises a first-stage first reaction tank, a first-stage second reaction tank and a first sedimentation tank which are sequentially connected, the first-stage first reaction tank is connected with the ammonia nitrogen removal medicament feeder, the first-stage second reaction tank is connected with the first flocculant feeder, and the first sedimentation tank is connected with the first coagulant feeder.
[0010] Specifically:
[0011] The bottom of the first-stage first reaction tank is connected to the middle part of the first-stage second reaction tank through a pipeline;
[0012] The first flocculant feeder extends to the middle part of the first-stage second reaction tank;
[0013] The first secondary reaction tank and the first sedimentation tank are communicated through a vertical first S-shaped flow channel;
[0014] The first coagulant aid feeder extends to the outlet of the first S-shaped flow channel.
[0015] Specifically,
[0016] The first primary reaction tank is provided with a first primary stirrer;
[0017] The first secondary reaction tank is provided with a first secondary stirrer;
[0018] The first sedimentation tank is provided with a first mud scraper.
[0019] Specifically, on the secondary high-density sedimentation tank, an oxidant feeder, a catalyst feeder, a second flocculant feeder and a second coagulant aid feeder are sequentially communicated along the material flow direction.
[0020] Specifically, the secondary high-density sedimentation tank has a second tank body, the second tank body includes a second primary reaction tank, a second secondary reaction tank and a second sedimentation tank which are sequentially communicated, the second primary reaction tank is communicated with the oxidant feeder and the catalyst feeder, the second secondary reaction tank is communicated with the second flocculant feeder, and the second sedimentation tank is communicated with the second coagulant aid feeder.
[0021] Specifically,
[0022] The bottom of the second primary reaction tank is communicated to the middle part of the second secondary reaction tank through a pipeline;
[0023] The second flocculant feeder extends to the middle part of the second secondary reaction tank;
[0024] The second secondary reaction tank and the second sedimentation tank are communicated through a vertical second S-shaped flow channel;
[0025] The second coagulant aid feeder extends to the outlet of the second S-shaped flow channel.
[0026] Specifically,
[0027] The second primary reaction tank is provided with a second primary stirrer;
[0028] The second secondary reaction tank is provided with a second secondary stirrer;
[0029] The second sedimentation tank is provided with a second mud scraper.
[0030] Based on the above technical scheme, the desulfurization wastewater is pumped into the inlet of the first high-density sedimentation tank by the first water supply pump, the ammonia-nitrogen removing agent dosing device, the first flocculant dosing device and the first coagulant aid dosing device are arranged in the first high-density sedimentation tank, and the ammonia-nitrogen of the desulfurization wastewater is reduced. The water produced by the first high-density sedimentation tank enters the intermediate water tank, the water in the intermediate water tank is pumped into the second high-density sedimentation tank by the second water supply pump, the oxidizing agent dosing device, the catalyst dosing device, the second flocculant dosing device and the second coagulant aid dosing device are arranged in the second high-density sedimentation tank, the COD of the desulfurization wastewater is reduced, the water produced by the second high-density sedimentation tank enters the clean water tank, and the sludge discharged from the first high-density sedimentation tank and the second high-density sedimentation tank is sent to the sludge filter press.
[0031] Further, the system further comprises a sludge filter press, and the sludge discharge port of the first high-density sedimentation tank and / or the sludge discharge port of the second high-density sedimentation tank is communicated with the sludge filter press.
[0032] The beneficial effects of the utility model are as follows:
[0033] The ammonia-nitrogen removing agent dosing device is used for dosing, the ammonia-nitrogen of the desulfurization wastewater is reduced, the ammonia-nitrogen of the wastewater can be less than 25 mg / L, the oxidizing agent dosing device and the catalyst dosing device are used for dosing, the COD of the desulfurization wastewater is reduced, and the COD of the desulfurization wastewater can be less than 150 mg / L. Thus, the treated desulfurization wastewater can be reused in the factory, and the resource utilization level of the desulfurization wastewater is improved. BRIEF DESCRIPTION OF DRAWINGS
[0034] Figure 1 It is a structure schematic view of the system for reducing the COD and ammonia-nitrogen of desulfurization wastewater provided by the utility model.
[0035] Figure 2 It is a structure schematic view of the first high-density sedimentation tank of the utility model.
[0036] Figure 3 It is a structure schematic view of the second high-density sedimentation tank of the utility model.
[0037] ATTACHMENT Figure 1 , 2 , 3, the structure represented by each reference numeral is listed as follows:
[0038] 1, primary feed water pump; 2, primary high-density sedimentation tank; 21, first primary agitator; 22, first secondary agitator; 23, first mud scraper; 24, first tank body; 3, intermediate water tank; 4, secondary feed water pump; 5, secondary high-density sedimentation tank; 51, second primary agitator; 52, second secondary agitator; 53, second mud scraper; 54, second tank body; 6, clean water tank; 7, sludge filter press; 8, ammonia and nitrogen removal agent feeder; 9, first flocculant feeder; 10, first coagulant aid feeder; 11, oxidizing agent feeder; 12, catalyst feeder; 13, second flocculant feeder; 14, second coagulant aid feeder. DETAILED DESCRIPTION
[0039] The principles and features of the present application are described below, and the examples are used to explain the present application, but are not intended to limit the scope of the present application.
[0040] It should be noted that when a part or component is considered to be "connected", "located", "assembled" on another part or component, it can be directly provided on another part or component or there can be a middle part or component. The terms "left", "right", "up", "down" and similar expressions used herein are for illustrative purposes only.
[0041] The materials, reagents, etc. used are commercially available reagents and materials unless otherwise specified.
[0042] Example 1
[0043] As shown in Figure 1 The system for reducing the COD and ammonia nitrogen of desulfurization wastewater includes a primary feed water pump 1, a primary high-density sedimentation tank 2, an intermediate water tank 3, a secondary feed water pump 4, a secondary high-density sedimentation tank 5, and a clean water tank 6, which are sequentially connected.
[0044] As shown in Figure 2 On the primary high-density sedimentation tank 2, an ammonia and nitrogen removal agent feeder 8, a first flocculant feeder 9, and a first coagulant aid feeder 10 are sequentially connected along the material flow direction. The primary high-density sedimentation tank 2 has a first tank body 24, which includes a first primary reaction tank, a first secondary reaction tank, and a first sedimentation tank, which are sequentially connected. The first primary reaction tank is connected to the ammonia and nitrogen removal agent feeder 8, the first secondary reaction tank is connected to the first flocculant feeder 9, and the first sedimentation tank is connected to the first coagulant aid feeder 10. The first primary reaction tank is provided with a first primary agitator 21. The first secondary reaction tank is provided with a first secondary agitator 22. The first sedimentation tank is provided with a first mud scraper 23.
[0045] The bottom of the first primary reaction tank is connected to the middle of the first and second secondary reaction tanks via a pipeline. A first flocculant doser 9 extends into the middle of the first and second secondary reaction tanks. The first and second secondary reaction tanks and the first sedimentation tank are connected via a vertical first S-shaped flow channel. A first coagulant aid doser 10 extends into the outlet of the first S-shaped flow channel.
[0046] like Figure 3 As shown, in the secondary high-density sedimentation tank 5, an oxidant doser 11, a catalyst doser 12, a second flocculant doser 13, and a second coagulant aid doser 14 are sequentially connected along the material flow direction. The secondary high-density sedimentation tank 5 has a second tank body 54, which includes a second primary reaction tank, a second secondary reaction tank, and a second sedimentation tank that are sequentially connected. The second primary reaction tank is connected to the oxidant doser 11 and the catalyst doser 12, the second secondary reaction tank is connected to the second flocculant doser 13, and the second sedimentation tank is connected to the second coagulant aid doser 14. The second primary reaction tank is provided with a second primary agitator 51. The second secondary reaction tank is provided with a second secondary agitator 52. The second sedimentation tank is provided with a second scraper 53.
[0047] The bottom of the second primary reaction tank is connected to the middle of the second secondary reaction tank via a pipeline. A second flocculant doser 13 extends into the middle of the second secondary reaction tank. The second secondary reaction tank and the second sedimentation tank are connected via a second vertical S-shaped flow channel. A second coagulant aid doser 14 extends into the outlet of the second S-shaped flow channel.
[0048] The primary water supply pump 1 sends the desulfurization wastewater into the inlet of the primary high-density sedimentation tank 2; the ammonia nitrogen content of the desulfurization wastewater is reduced in the primary high-density sedimentation tank 2; the intermediate water tank 3 achieves wastewater homogeneity and quantity; the secondary water supply pump 4 is used to send the wastewater into the inlet of the secondary high-density sedimentation tank 5; the COD content of the desulfurization wastewater is reduced in the secondary high-density sedimentation tank 5; the supernatant of the secondary high-density sedimentation tank 5 is discharged into the clean water tank 6 and then reused.
[0049] In the first-level high-density sedimentation tank 2 and the second-level high-density sedimentation tank 5, a flocculant doser is used in front of each sedimentation tank. The suspended matter is separated from the mud and water in the sedimentation tank, and the supernatant enters the intermediate water tank. The sludge in the sedimentation tank is scraped by the scraper to the mud discharge port and can be discharged to the sludge filter press 7.
[0050] Based on this technical solution, an ammonia nitrogen removal agent doser, a first flocculant doser, and a first coagulant aid doser are installed in the primary high-density sedimentation tank to reduce ammonia nitrogen in the desulfurization wastewater. An oxidant doser, a catalyst doser, a second flocculant doser, and a second coagulant aid doser are installed in the secondary high-density sedimentation tank to reduce the COD of the desulfurization wastewater.
[0051] Example 2
[0052] like Figure 1As shown, on the basis of Embodiment 1, the system further comprises a sludge filter press 7. The sludge discharge port of the first high-density sedimentation tank 2 and the sludge discharge port of the second high-density sedimentation tank 5 are communicated with the sludge filter press 7. Based on this technical solution, the sludge discharged from the first high-density sedimentation tank 2 and the second high-density sedimentation tank 5 can be treated.
[0053] Effect example
[0054] The influent is desulfurization wastewater, the COD is 300-400 mg / L, the ammonia nitrogen is 40-50 mg / L, and the suspended solids are about 5000 mg / L.
[0055] Specifically, the COD is about 350 mg / L, the ammonia nitrogen is about 45 mg / L, and the suspended solids are about 5000 mg / L.
[0056] Ammonia nitrogen removal agent feeder 8: sodium phosphate is used, and the dosage is 200 mg / L.
[0057] First flocculant feeder 9: polyaluminum chloride is used, and the dosage is 35 mg / L.
[0058] First coagulant aid feeder 10: polyacrylamide is used, and the dosage is 2 mg / L.
[0059] Oxidizing agent feeder 11: hydrogen peroxide is used, and the dosage is 500 mg / L.
[0060] Catalyst feeder 12: ferrous sulfate is used, and the dosage is 500 mg / L.
[0061] Second flocculant feeder 13: polyaluminum chloride is used, and the dosage is 35 mg / L.
[0062] Second coagulant aid feeder 14: polyacrylamide is used, and the dosage is 2 mg / L.
[0063] The effluent COD is less than 150 mg / L, the ammonia nitrogen is less than 25 mg / L, and the suspended solids are less than 70 mg / L.
[0064] Comparative Example 1
[0065] With reference to Embodiment 2, the difference is that the ammonia nitrogen removal agent feeder 8 is not provided, and the result is that the effluent ammonia nitrogen is still about 45 mg / L, without removal effect.
[0066] Comparative Example 2
[0067] With reference to Embodiment 2, the difference is that the first flocculant feeder 9 is not provided, and the result is that the effluent ammonia nitrogen is greater than 25 mg / L.
[0068] Comparative Example 3
[0069] Reference example 2, the difference is that the first coagulant aid feeder 10 is not set, and the result is that the ammonia nitrogen of the effluent is greater than 25 mg / L.
[0070] Comparative example 4
[0071] Reference example 2, the difference is that the oxidant feeder 11 is not set, and the result is that the COD of the effluent is still about 350 mg / L.
[0072] Comparative example 5
[0073] Reference example 2, the difference is that the catalyst feeder 12 is not set, and the result is that the COD of the effluent is about 300 mg / L, and the suspended solids are greater than 150 mg / L.
[0074] Comparative example 6
[0075] Reference example 2, the difference is that the second flocculant feeder 13 is not set, and the result is that the suspended solids of the effluent are greater than 70 mg / L.
[0076] Comparative example 7
[0077] Reference example 2, the difference is that the second coagulant aid feeder 14 is not set, and the result is that the suspended solids of the effluent are greater than 70 mg / L.
[0078] The above is only a preferred embodiment of the present application, and does not limit the present application in any form; any ordinary technical personnel in the industry can implement the present application according to the drawings and the above; however, any equivalent changes, modifications and evolution of the above disclosed technical content within the scope of the technical scheme of the present application can be made by those skilled in the art, and all of the above are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present application are still within the protection scope of the technical scheme of the present application.
Claims
1. A system for reducing COD and ammonia nitrogen in desulfurization wastewater, characterized by: The system comprises at least a primary water supply pump (1), a primary high-density sedimentation tank (2), an intermediate water tank (3), a secondary water supply pump (4), a secondary high-density sedimentation tank (5) and a clean water tank (6) which are connected in sequence.
2. The system for reducing COD and ammonia nitrogen in desulfurization wastewater according to claim 1, characterized in that: On the primary high-density sedimentation tank (2), an ammonia nitrogen removal agent doser (8), a first flocculant doser (9) and a first coagulant aid doser (10) are sequentially connected and arranged along the material flow direction.
3. The system for reducing COD and ammonia nitrogen in desulfurization wastewater according to claim 2, characterized in that: The first-level high-density sedimentation tank (2) has a first tank body (24), and the first tank body (24) includes a first-level reaction tank, a first-level secondary reaction tank and a first sedimentation tank connected in sequence, the first-level reaction tank is connected to the ammonia nitrogen removal agent doser (8), the first-level secondary reaction tank is connected to the first flocculant doser (9), and the first sedimentation tank is connected to the first coagulant aid doser (10).
4. The system for reducing COD and ammonia nitrogen in desulfurization wastewater according to claim 3, characterized in that: The bottom of the first primary reaction tank is connected to the middle of the first secondary reaction tank through a pipeline; The first flocculant doser (9) extends toward the middle of the first secondary reaction tank; The first secondary reaction tank and the first sedimentation tank are connected through a vertical first S-shaped flow channel; The first coagulant aid doser (10) extends toward the outlet of the first S-shaped flow channel.
5. The system for reducing COD and ammonia nitrogen in desulfurization wastewater according to claim 4, characterized in that: The first-stage reaction tank is provided with a first-stage agitator (21); The first and second-stage reaction tanks are provided with first and second-stage agitators (22); The first sedimentation tank is provided with a first scraper (23).
6. The system for reducing COD and ammonia nitrogen in desulfurization wastewater according to claim 1, characterized in that: On the secondary high-density sedimentation tank (5), an oxidant doser (11), a catalyst doser (12), a second flocculant doser (13) and a second coagulant aid doser (14) are sequentially connected along the material flow direction.
7. The system for reducing COD and ammonia nitrogen in desulfurization wastewater according to claim 6, characterized in that: The secondary high-density sedimentation tank (5) has a second tank body (54), and the second tank body (54) includes a second primary reaction tank, a second secondary reaction tank and a second sedimentation tank connected in sequence, the second primary reaction tank is connected to the oxidant doser (11) and the catalyst doser (12), the second secondary reaction tank is connected to the second flocculant doser (13), and the second sedimentation tank is connected to the second coagulant aid doser (14).
8. The system for reducing COD and ammonia nitrogen in desulfurization wastewater according to claim 7, characterized in that: The bottom of the second primary reaction tank is connected to the middle of the second secondary reaction tank through a pipeline; The second flocculant doser (13) extends toward the middle of the second secondary reaction tank; The second secondary reaction tank and the second sedimentation tank are connected through a vertical second S-shaped flow channel; The second coagulant aid doser (14) extends toward the outlet of the second S-shaped flow channel.
9. The system for reducing COD and ammonia nitrogen in desulfurization wastewater according to claim 8, characterized in that: The second-stage reaction tank is provided with a second-stage agitator (51); The second secondary reaction tank is provided with a second secondary agitator (52); The second sedimentation tank is provided with a second scraper (53).
10. The system for reducing COD and ammonia nitrogen in desulfurization wastewater according to any one of claims 1 to 9, characterized in that: The system also includes a sludge filter press (7); The mud discharge port of the first-level high-density sedimentation tank (2) and / or the mud discharge port of the second-level high-density sedimentation tank (5) are connected to the sludge filter press (7).