An ammonia vapor wastewater treatment system
By combining multi-stage wastewater tanks and a loosening system with biochemical treatment processes, the problems of short service life of wastewater tanks and pipeline blockage in ammonia-containing wastewater treatment systems have been solved, achieving stable operation and efficient treatment of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ETUOKE BANNER HONGYING COKING CO LTD
- Filing Date
- 2025-07-03
- Publication Date
- 2026-07-21
AI Technical Summary
In existing ammonia-containing wastewater treatment systems, the wastewater tanks have short service life, and the accumulation of impurities leads to pipe blockage, affecting the stable operation of the system. High concentrations of toxic and harmful substances damage the biochemical treatment system, resulting in a decrease in treatment efficiency.
The system employs a multi-stage wastewater tank design, combining a loosening system and biochemical treatment processes. It includes an oil-water separation tank, an anaerobic tank, an anoxic tank, an aerobic tank, and a sedimentation tank. Flowability is ensured through transfer pumps and heat exchangers, while loosening pipes and high-pressure pumps prevent sediment accumulation. A sludge transfer pump is installed to achieve directional transport.
It extends the service life of the wastewater tank, prevents pipe blockage, improves the efficiency of biochemical treatment, reduces equipment maintenance costs, and ensures the stable operation of the system.
Smart Images
Figure CN224530763U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ammonia-containing wastewater treatment, specifically to an ammonia-containing wastewater treatment system. Background Technology
[0002] In the ammonia stripping process during coking, the wastewater from the ammonia stripping tower is heated, and ammonia gas is volatilized and recovered from the top. The wastewater at the bottom of the tower contains a large amount of organic matter, including toxic and harmful substances such as phenols, cyanides, and sulfides. In existing technologies, the wastewater at the bottom of the ammonia stripping tower typically flows by gravity into a wastewater tank for sedimentation treatment (e.g., Figure 2 As shown in the diagram, the settled wastewater is cooled by a transfer pump and heat exchanger before being transported to the biological treatment system for further treatment. However, this single wastewater tank design has significant drawbacks: the wastewater tank has a short service life, and as operating time increases, the amount of impurities accumulated in the tank gradually increases, affecting not only the treatment effect but also causing serious damage to downstream equipment. In particular, sediment in the wastewater easily accumulates in the transport pipeline, leading to blockages and affecting the stable operation of the entire system. Furthermore, high concentrations of toxic and harmful substances directly affect the microbial activity of the downstream biological treatment system, resulting in decreased biological treatment efficiency and even system failure. These problems severely restrict the long-term stable operation and treatment effect of the ammonia-containing wastewater treatment system. Utility Model Content
[0003] To address the aforementioned problems, this utility model provides an ammonia-containing wastewater treatment system.
[0004] This utility model is achieved through the following technical solution:
[0005] This application provides an ammonia stripping wastewater treatment system, the technical solution of which is as follows: it includes an ammonia stripping tower and a first wastewater tank connected to its lower part. The first wastewater tank is connected to a second wastewater tank and a third wastewater tank in sequence through pipelines. A transfer pump and a heat exchanger are installed on the pipelines between the first wastewater tank, the second wastewater tank and the third wastewater tank. The supernatant of the third wastewater tank is transported to the biochemical treatment system through pipelines. The bottoms of the first wastewater tank, the second wastewater tank and the third wastewater tank are transported to the sedimentation tank of the biochemical treatment system through sedimentation and conveying pipes.
[0006] Furthermore, this application also proposes that the biochemical treatment system includes an oil-water separation and equalization tank, an anaerobic tank, an anoxic tank, an aerobic tank, and a sedimentation tank connected in sequence, with the oil-water separation and equalization tank connected to the outlet of a third wastewater tank.
[0007] Furthermore, this application also proposes that the bottoms of the first wastewater tank, the second wastewater tank, and the third wastewater tank are connected to the sedimentation conveying pipe via conveying branch pipes, and a sludge conveying pump is installed on the sedimentation conveying pipe.
[0008] Furthermore, this application also proposes that the first wastewater tank, the second wastewater tank, and the third wastewater tank further include a loosening system, which includes a loosening pipe equipped with a high-pressure pump. The inlet of the loosening pipe is connected to the front end pipeline of the first wastewater tank, and the loosening pipe is connected to the bypass of the conveying branch pipe at the bottom of the first wastewater tank, the second wastewater tank, and the third wastewater tank.
[0009] Furthermore, this application also proposes that control valves are installed at the upper and lower ends of the connection between the conveying branch pipes and the loosening pipes of the first wastewater tank, the second wastewater tank, and the third wastewater tank, and a shut-off valve is installed at the front end of the loosening pipe.
[0010] Compared with existing technologies, the beneficial effects of this utility model are: by setting up multi-stage wastewater tanks and a special loosening system, this utility model effectively solves the problems of impurity accumulation in wastewater tanks and pipe blockage, and has the advantages of extending the service life of wastewater tanks, preventing pipe blockage, improving system stability and biochemical treatment efficiency. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the system of this utility model;
[0012] Figure 2 This is a schematic diagram of the prior art of this utility model;
[0013] In the diagram: 1. Ammonia stripping tower; 2. First wastewater tank; 3. Second wastewater tank; 4. Third wastewater tank; 5. Transfer pump; 6. Heat exchanger; 7. Oil-water separation and equalization tank; 8. Anaerobic tank; 9. Anoxic tank; 10. Aerobic tank; 11. Sedimentation tank; 12. Sedimentation and transfer pipe; 13. Transfer branch pipe; 14. Sludge transfer pump; 15. Control valve; 16. Loosening pipe; 17. High-pressure pump; 18. Shut-off valve. Detailed Implementation
[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:
[0015] like Figure 1 As shown, this application proposes an ammonia stripping wastewater treatment system, including an ammonia stripping tower and a first wastewater tank connected to its lower part. The first wastewater tank is connected to a second wastewater tank and a third wastewater tank in sequence through pipelines. A transfer pump and a heat exchanger are installed on the pipelines between the first wastewater tank, the second wastewater tank, and the third wastewater tank. The supernatant of the third wastewater tank is transported to the biochemical treatment system through pipelines. The bottoms of the first wastewater tank, the second wastewater tank, and the third wastewater tank are transported to the sedimentation tank of the biochemical treatment system through sedimentation transport pipes.
[0016] The transfer pump can be a centrifugal pump or a screw pump, used to transfer wastewater from one wastewater tank to the next. The heat exchanger can be a plate heat exchanger or a shell-and-tube heat exchanger, used to cool the wastewater. The sedimentation transfer pipe can be made of stainless steel or PVC, used to transport the sediment to the sedimentation tank of the biological treatment system. The first, second, and third wastewater tanks can be connected in series or parallel; the specific connection method can be adjusted according to actual treatment requirements.
[0017] This technical solution extends the wastewater treatment cycle and reduces the processing load on individual tanks by using multiple wastewater tanks connected in series to treat ammonia-containing wastewater. Sequential sedimentation in multiple tanks effectively reduces impurities and minimizes damage to the downstream biological treatment system. The placement of transfer pumps and heat exchangers ensures smooth flow and temperature control during inter-tank transfer. A sedimentation conveying pipe directly transports the precipitate to the sedimentation tank of the biological treatment system, achieving solid-liquid separation and seamless integration with subsequent treatment. Compared to existing technologies, this system improves wastewater treatment efficiency, reduces equipment maintenance costs, and ensures stable operation of the biological treatment system.
[0018] Furthermore, this application also proposes that the biochemical treatment system in the ammonia-containing wastewater treatment system includes an oil-water separation and equalization tank, an anaerobic tank, an anoxic tank, an aerobic tank, and a sedimentation tank connected in sequence, with the oil-water separation and equalization tank connected to the outlet of the third wastewater tank.
[0019] Specifically, the oil-water separation and homogenization tank is used for preliminary treatment of the supernatant from the third wastewater tank, removing oily substances and homogenizing the water quality. The anaerobic tank degrades organic pollutants in the wastewater under anaerobic conditions through the action of anaerobic microorganisms. The anoxic tank performs denitrification under low dissolved oxygen conditions. The aerobic tank provides sufficient oxygen through aeration, allowing aerobic microorganisms to further decompose organic matter. The sedimentation tank is used to separate sludge from water; the treated effluent meets discharge standards, while some of the sludge is returned to the upstream biological treatment tank. As a preferred embodiment, the oil-water separation and homogenization tank can be equipped with a mechanical oil skimmer and a stirring device; the anaerobic tank can use a UASB or EGSB reactor; and the aerobic tank can employ an activated sludge process or a biofilm process.
[0020] Therefore, this technical solution, by establishing a complete biochemical treatment process chain, can effectively treat organic pollutants and harmful substances such as ammonia nitrogen in ammonia-containing wastewater. The oil-water separation and equalization tank, acting as a pretreatment unit, reduces the load on subsequent biochemical treatment, and the combination of multi-stage biochemical treatment processes significantly improves treatment efficiency. Compared with existing technologies that directly discharge wastewater into simple sedimentation tanks, this solution solves the problem of severe damage to downstream equipment caused by toxic and harmful substances in wastewater, ensuring the stable operation of the biochemical treatment system.
[0021] Furthermore, this application also proposes that the bottoms of the first wastewater tank, the second wastewater tank, and the third wastewater tank are connected to the sedimentation conveying pipe via conveying branch pipes, and a sludge conveying pump is installed on the sedimentation conveying pipe.
[0022] The conveying branch pipe, serving as the channel connecting the wastewater tank and the sedimentation conveying pipe, can be made of stainless steel or corrosion-resistant plastic, with a pipe diameter designed from DN50 to DN150 based on the wastewater flow rate. The conveying branch pipe is fixed to the bottom of the wastewater tank using flange connections or welding, with a preferred connection angle of 45° to facilitate sediment discharge. The sludge conveying pump is a corrosion-resistant centrifugal pump or screw pump, with a flow rate range of 5-20 m³ / h. 3 The pump has a flow rate of 15-30m per hour and a head of 15-30m. The pump body is made of stainless steel or engineering plastic. Multiple sets of parallel pipelines can be installed for the delivery branch pipes, each corresponding to a wastewater tank, and the opening and closing are controlled by valves.
[0023] Specifically, this technical solution achieves directional transport of sediment at the bottom of the wastewater tank by adding conveying branch pipes and sludge conveying pumps. After wastewater settles in three series-connected wastewater tanks, the sediment is collected through the conveying branch pipes to the sedimentation conveying pipe, where it is forcibly transported to the sedimentation tank by the sludge conveying pump. The inclined arrangement of the conveying branch pipes prevents sediment accumulation and blockage, and the sludge conveying pump provides stable transport power, solving the problem of poor sediment discharge in traditional gravity-flow methods. Compared with single-tank systems, multi-stage sedimentation combined with mechanical conveying significantly reduces the suspended solids content entering the biological treatment system and reduces wear on downstream equipment.
[0024] Furthermore, this application also proposes to add a loosening system to the first wastewater tank, the second wastewater tank, and the third wastewater tank. The loosening system includes a loosening pipe equipped with a high-pressure pump. The inlet of the loosening pipe is connected to the front end pipeline of the first wastewater tank, and the loosening pipe is connected to the bypass of the conveying branch pipe at the bottom of the first wastewater tank, the second wastewater tank, and the third wastewater tank.
[0025] Specifically, the loosening pipe can be made of corrosion-resistant metal or plastic, with a preferred diameter range of 50-100 mm. The high-pressure pump operates at a pressure controlled within the range of 0.5-1.0 MPa to generate sufficient impact force. The bypass connection between the loosening pipe and the delivery branch pipe can be achieved using a tee fitting, with a preferred connection angle of 30-45 degrees. In practice, the loosening pipe can be configured with multiple branch pipes, each leading to a delivery branch pipe in a different wastewater tank. As a preferred embodiment, the high-pressure pump can be frequency-controlled, adjusting the output pressure as needed.
[0026] Therefore, by adding a loosening system, the accumulation of sediment at the bottom of the wastewater tank can be effectively prevented. High-pressure water flow periodically flushes the delivery branch pipes through the loosening pipe, preventing sediment from clogging the pipeline. This technical solution solves the problems of short service life of wastewater tanks and high impurity content in downstream systems in existing technologies. By using mechanical loosening, it extends the service life of the equipment and ensures the stable operation of the biochemical treatment system. Compared with relying solely on gravity sedimentation, this solution significantly improves sediment discharge efficiency and reduces equipment maintenance costs.
[0027] Furthermore, this application also proposes that control valves be installed at the upper and lower ends of the connection between the conveying branch pipes and the loosening pipes of the first wastewater tank, the second wastewater tank, and the third wastewater tank, and that a shut-off valve be installed at the front end of the loosening pipe.
[0028] The control valve adopts a bidirectional shut-off valve structure, enabling bidirectional shut-off of fluid between the delivery branch pipe and the loosening pipe. Specifically, the control valve can be a gate valve or ball valve driven by an electric actuator, with the valve body preferably made of 316L stainless steel for corrosion resistance. The shut-off valve adopts a one-way shut-off valve structure and is installed at the front end of the loosening pipe near the high-pressure pump, used to completely isolate the high-pressure pump from downstream pipelines during system maintenance. As a preferred embodiment, both the control valve and the shut-off valve can be equipped with position sensors to transmit valve opening signals to the central control system for remote monitoring.
[0029] This technical solution achieves the following effects by installing dual control valves at the connection between the conveying branch pipe and the loosening pipe in the multi-stage wastewater treatment system, and adding a shut-off valve at the front end of the loosening pipe: the dual control valves allow for precise adjustment of the switching process between sediment conveying and loosening operations, preventing interference between the two operations; the shut-off valve facilitates independent maintenance of the high-pressure pump, improving system reliability. Therefore, this valve configuration effectively solves the problem of coordinated control between sediment conveying and loosening operations in a multi-stage wastewater treatment system, while also reducing equipment maintenance difficulty.
[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. An ammonia stripping wastewater treatment system, comprising an ammonia stripping tower (1) and a first wastewater tank (2) connected to its lower part, characterized in that: The first wastewater tank (2) is connected to the second wastewater tank (3) and the third wastewater tank (4) in sequence through pipelines. A transfer pump (5) and a heat exchanger (6) are installed on the pipelines between the first wastewater tank (2), the second wastewater tank (3), and the third wastewater tank (4). The supernatant of the third wastewater tank (4) is transported to the biochemical treatment system through pipelines. The bottom of the first wastewater tank (2), the second wastewater tank (3), and the third wastewater tank (4) is transported to the sedimentation tank (11) of the biochemical treatment system through sedimentation transfer pipe (12).
2. The ammonia-containing wastewater treatment system according to claim 1, characterized in that: The biochemical treatment system includes an oil-water separation tank (7), an anaerobic tank (8), an anoxic tank (9), an aerobic tank (10), and a sedimentation tank (11) connected in sequence. The oil-water separation tank (7) is connected to the outlet of the third wastewater tank (4).
3. The ammonia-containing wastewater treatment system according to claim 1, characterized in that: The bottom of the first wastewater tank (2), the second wastewater tank (3), and the third wastewater tank (4) are connected to the sedimentation conveying pipe (12) through a conveying branch pipe (13), and a sludge conveying pump (14) is installed on the sedimentation conveying pipe (12).
4. The ammonia-containing wastewater treatment system according to claim 3, characterized in that: The first wastewater tank (2), the second wastewater tank (3), and the third wastewater tank (4) also include a loosening system, which includes a loosening pipe (16) and a high-pressure pump (17) installed on the loosening pipe (16). The inlet of the loosening pipe (16) is connected to the front end pipeline of the first wastewater tank (2), and the loosening pipe (16) is connected to the conveying branch pipe (13) at the bottom of the first wastewater tank (2), the second wastewater tank (3), and the third wastewater tank (4) via a bypass.
5. The ammonia-containing wastewater treatment system according to claim 4, characterized in that: Control valves (15) are installed at the upper and lower ends of the connection between the conveying branch pipe (13) of the first wastewater tank (2), the second wastewater tank (3), and the third wastewater tank (4) and the loosening pipe (16). A shut-off valve (18) is installed at the front end of the loosening pipe (16).