A wastewater pretreatment flocculant dosing device
By using UPVC corrosion-resistant pipes and stainless steel pipe structures, the problem of corrosion and leakage in ferrous sulfate dosing pipes was solved, achieving stable and efficient operation of wastewater treatment, simplifying equipment structure, and reducing costs and environmental pollution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI MA STEEL EQUIP MAINTENANCE CO LTD
- Filing Date
- 2025-04-21
- Publication Date
- 2026-05-29
AI Technical Summary
In the existing wastewater treatment process of coking plants, the dosing pipelines for ferrous sulfate flocculant are prone to corrosion and leakage, resulting in waste of reagents, environmental pollution, frequent maintenance and reduced treatment efficiency, as well as increased equipment complexity and cost.
The corrosion-resistant conveying and dosing pipeline is made of UPVC pipe, combined with stainless steel pipe and quick-connect pipe fittings, and designed with elbows to optimize water flow mixing, eliminating the need for check valves and simplifying the structure.
It effectively prevents ferrous sulfate corrosion, reduces reagent leakage, lowers maintenance frequency, improves treatment efficiency and system reliability, reduces costs, and ensures the stability and efficiency of wastewater treatment.
Smart Images
Figure CN224298990U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of wastewater pretreatment technology, specifically relating to a wastewater pretreatment flocculant dosing device. Background Technology
[0002] Currently, wastewater treatment in coking plants often involves complex multi-stage and multi-unit systems, including pretreatment flotation units, anoxic denitrification tanks, aerobic nitrification tanks and reflux sedimentation tanks, post-denitrification, physicochemical treatment, external effluent filters, and sludge dewatering. The pretreatment system plays a crucial role in the entire wastewater treatment process, primarily removing floating oil and oil sludge from the raw water through a chemical reaction between the flocculant ferrous sulfate and dissolved air water. In the specific process flow, the raw water pump transports the raw water from the equalization tank to the flotation tank, while the ferrous sulfate flocculant is added post-pump, with the dosing pipe directly welded to the raw water pump outlet pipe.
[0003] However, while ferrous sulfate plays a role in removing floating oil and sludge as a flocculant in existing wastewater treatment technologies, it also has serious drawbacks. Because ferrous sulfate is extremely corrosive to low-carbon steel and austenitic stainless steel, the pipelines located at the dosing points are constantly exposed to a harsh corrosive environment, leading to frequent leaks.
[0004] Figure 2A schematic diagram of the original wastewater pretreatment flocculant dosing device is shown. The stainless steel pipe 2 used for dosing is welded through to the wastewater pipe 1 at the outlet of the raw water pump. The flocculant ferrous sulfate is added into the wastewater pipe 1 through the stainless steel pipe 2 and reacts. Leakage often occurs. According to actual data statistics, this leakage needs to be treated 3 to 4 times a month. Such frequent leakage has brought many adverse consequences: (1) A large amount of ferrous sulfate cannot participate in the wastewater treatment reaction due to leakage, resulting in a serious waste of reagent resources. In addition, the leaked reagent flows into the surrounding environment, causing environmental pollution. (2) Each pipeline leak requires maintenance work, which greatly increases the frequency of maintenance work and consumes a lot of manpower, material resources and time costs. More importantly, as a core piece of equipment in the initial stage of the wastewater treatment process, the frequent leaks in the outlet pipe of the raw water pump, leading to shutdowns and maintenance, can create a chain reaction along the entire water treatment system's process flow. This severely disrupts subsequent treatment stages, ultimately resulting in a significant decrease in wastewater treatment capacity and seriously impacting the overall efficiency and capacity of the wastewater treatment system. Furthermore, due to the high pressure of the raw water, under current technological conditions, there is a risk of accidental flow into the stainless steel pipe 2, which serves as the dosing line. To prevent this, an additional check valve 3 must be added to the stainless steel pipe 2 for control. This undoubtedly further increases the complexity and construction cost of the entire equipment system, reducing its overall reliability and economy, becoming a critical problem that urgently needs to be addressed in current coking plant wastewater treatment technology. Utility Model Content
[0005] This utility model provides a wastewater pretreatment flocculant dosing device, which effectively solves the problem of easy corrosion and leakage of flocculant dosing pipes on wastewater pipelines in the prior art. It reduces agent waste and environmental pollution, lowers maintenance frequency, ensures the stable operation of the raw water pump and the entire wastewater treatment system, and avoids the reduction of sewage treatment capacity due to pipeline leakage. At the same time, it simplifies the complex maintenance process of the original flocculant dosing device, which required the addition of check valves to deal with raw water pressure issues. It improves the overall reliability of the system and enhances the coagulation effect of wastewater, ensuring that the wastewater treatment process can operate efficiently and stably continuously to meet the strict requirements of modern industrial production for high efficiency, stability, environmental protection, and low-cost operation of wastewater treatment.
[0006] The technical solution of this utility model to solve the technical problem is as follows:
[0007] This utility model provides a wastewater pretreatment flocculant dosing device, which includes a wastewater pipeline, a stainless steel pipe, a quick-connect pipe, a corrosion-resistant flocculant conveying pipe, and a corrosion-resistant flocculant dosing pipe. The stainless steel pipe is welded through the wastewater pipeline, and its outer end is welded and fixed to one end of the quick-connect pipe. The corrosion-resistant flocculant conveying pipe is threadedly connected to the other end of the quick-connect pipe. The corrosion-resistant flocculant dosing pipe is sleeved inside the stainless steel pipe, with one end threadedly connected to the end of the quick-connect pipe, and the other end extending beyond the end of the stainless steel pipe located inside the wastewater pipeline.
[0008] Furthermore, the stainless steel pipe and the flocculant corrosion-resistant dosing pipe are respectively provided with a first elbow and a second elbow at the ends of the inner side of the wastewater pipe, and the orientation of the first elbow and the second elbow is consistent with the flow direction of the wastewater in the wastewater pipe.
[0009] Furthermore, the first elbow and the second elbow are located at the central axis of the wastewater pipeline.
[0010] Furthermore, both the flocculant corrosion-resistant conveying pipeline and the flocculant corrosion-resistant dosing pipeline are UPVC pipes.
[0011] Furthermore, both the flocculant corrosion-resistant conveying pipeline and the flocculant corrosion-resistant dosing pipeline are DN20 pipes, and the stainless steel pipe is a DN25 pipe.
[0012] Compared with the prior art, the wastewater pretreatment flocculant dosing device of this utility model has the following beneficial effects:
[0013] (1) This utility model has a novel, simple and reasonable structure, uses common materials, is very convenient to manufacture and implement, and has low cost. It can effectively solve the problems of pipe corrosion, poor dosing effect and complex equipment that exist when adding flocculants to existing wastewater pipes, and effectively improve the quality and efficiency of wastewater treatment.
[0014] (2) This utility model introduces a quick-connect pipe and equips it with a stainless steel pipe as a sleeve. One end of the quick-connect pipe is welded to the stainless steel pipe, and the stainless steel pipe is welded through to the wastewater pipe. The corrosion-resistant conveying pipe and the corrosion-resistant dosing pipe for transporting and adding ferrous sulfate flocculant are made of UPVC pipe, which has many excellent properties such as strong corrosion resistance, light weight, heat insulation, good insulation performance and easy processing and installation. The pipe can effectively resist the corrosion of ferrous sulfate. The corrosion-resistant conveying pipe and the corrosion-resistant dosing pipe are connected to the quick-connect pipe at both ends. The corrosion-resistant dosing pipe is used as the inner pipe of the stainless steel pipe, which constructs a stable and easy-to-maintain pipe connection structure to ensure the safety and stability of the agent transport process.
[0015] (3) This utility model adds a first bend and a second bend to the stainless steel pipe and the flocculant corrosion-resistant dosing pipe respectively along the direction of the wastewater flow. By carefully designing the pipe route, when ferrous sulfate is transported to the center point of the wastewater pipe at the outlet of the raw water pump through the flocculant corrosion-resistant dosing pipe, it can be quickly and fully mixed with the raw water and effectively diluted. This process not only significantly reduces the degree of corrosion of the pipe by ferrous sulfate, but also greatly improves the coagulation effect, making the wastewater treatment more efficient and stable.
[0016] (3) In this utility model, due to the addition of the elbow design, the flow state of the raw water is changed by cleverly utilizing the principle of hydrodynamics. This can effectively prevent the raw water from flowing into the flocculant corrosion-resistant dosing pipeline, thereby eliminating the need for a check valve in the original structure. This improvement not only simplifies the equipment structure and reduces costs, but also reduces the potential risks that may be caused by check valve failure, further improving the reliability and stability of the entire dosing system. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the existing wastewater pretreatment flocculant dosing device.
[0019] In the diagram: 1. Wastewater pipe; 2. Stainless steel pipe; 21. First elbow; 3. Check valve; 4. Quick connector; 5. Corrosion-resistant flocculant conveying pipe; 6. Corrosion-resistant flocculant dosing pipe; 61. Second elbow. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this disclosure pertains. The terms "upper," "lower," "left," "right," "front," and "back" used in the present patent application specification and claims are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly. Words such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Any aspects not detailed in the present utility model are well-known technologies to those skilled in the art.
[0021] like Figure 1 As shown, this utility model provides a wastewater pretreatment flocculant dosing device, which includes a wastewater pipe 1, a stainless steel pipe 2, a quick-connect pipe 4, a flocculant corrosion-resistant conveying pipe 5, and a flocculant corrosion-resistant dosing pipe 6. The wastewater pipe 1 is connected to the outlet of the raw water pump and is used to transport wastewater. The quick-connect pipe 4 is a conventional metal quick-connect pipe with threads at both ends for easy connection to other pipes. The flocculant corrosion-resistant conveying pipe 5 and the flocculant corrosion-resistant dosing pipe 6 are used to transport ferrous sulfate flocculant. UPVC pipes, preferably with strong corrosion resistance, light weight, good heat insulation, good electrical insulation properties, and easy processing and installation, are preferred, effectively resisting the corrosive effects of ferrous sulfate. In implementation, the stainless steel pipe 2 is welded through and onto the wastewater pipe 1, serving as support for the entire dosing device. Its outer end is welded and fixed to one end of the quick-connect pipe 4, ensuring the sealing and firmness of the weld. The welding operation must strictly follow relevant welding standards and specifications to ensure the weld quality meets requirements. The flocculant corrosion-resistant conveying pipeline 5 and the flocculant corrosion-resistant dosing pipeline 6 are respectively connected to the two ends of the quick-connect pipe 4 by thread. During the thread connection process, a suitable amount of sealing material, such as sealant, is carefully applied to enhance the sealing of the connection and prevent the agent from leaking. At the same time, the flocculant corrosion-resistant dosing pipeline 6 serves as the inner pipe for agent dosing and is sleeved inside the stainless steel pipe 2. The other end extends beyond the stainless steel pipe 2 and is located inside the wastewater pipeline 1 to avoid corrosion of the stainless steel pipe 2.
[0022] In a preferred embodiment, both the flocculant corrosion-resistant conveying pipeline 5 and the flocculant corrosion-resistant dosing pipeline 6 are DN20 pipes, and the stainless steel pipe 2 is a DN25 pipe, so that the flocculant corrosion-resistant dosing pipeline 6 can be installed as an inner pipe inside the stainless steel pipe 2 to form a sleeve structure.
[0023] In a preferred embodiment, the stainless steel pipe 2 and the flocculant corrosion-resistant dosing pipe 6 are respectively equipped with a first elbow 21 and a second elbow 61 at their ends located inside the wastewater pipe 1. The orientation of the first elbow 21 and the second elbow 61 is consistent with the flow direction of the wastewater in the wastewater pipe 1. Furthermore, the first elbow 21 and the second elbow 61 are located at the central axis of the wastewater pipe 1. According to the principles of hydrodynamics and the requirements of wastewater treatment processes, the addition of elbows at the central axis of the wastewater pipe 1 allows for the guidance and disturbance of water flow, enabling ferrous sulfate to mix rapidly and thoroughly with the raw water in a short time and be diluted. This optimized mixing method not only effectively reduces the concentration of ferrous sulfate in local areas and alleviates its corrosion of the pipe, but also significantly improves the coagulation effect, making the wastewater treatment process more efficient and stable, and improving the quality and efficiency of wastewater treatment.
[0024] In this embodiment, the selection of elbows needs to comprehensively consider factors such as the main pipe diameter, water flow velocity, and pressure, selecting elbow products with appropriate specifications and curvature radii. When installing elbows, ensure a tight and smooth connection with the main pipe to avoid water turbulence or excessive local resistance. When designing the pipeline route, professional pipeline design software or empirical formulas can be used for precise calculations and simulations to ensure that when ferrous sulfate is transported through the UPVC inner pipe to the center point of the raw water pump outlet pipe, it can be rapidly and thoroughly mixed with the raw water at the optimal location and effectively diluted. Throughout the entire pipeline layout optimization process, the slope and support structure of the pipeline need to be rationally designed and installed to ensure the stability and reliability of the pipeline system. This reduces the corrosion of the pipeline by ferrous sulfate while greatly improving the coagulation effect, achieving efficient and stable operation of wastewater treatment. Furthermore, after the dosing device is installed, the flow state of the raw water in the wastewater pipeline is analyzed and monitored in detail. By measuring and evaluating parameters such as water flow velocity, pressure, and flow direction, it is ensured that the raw water is unlikely to flow into the dosing pipe (i.e., the flocculant corrosion-resistant conveying pipe 5 and the flocculant corrosion-resistant dosing pipe 6) under the new pipeline structure. This eliminates the need for the previously installed check valve, simplifies the equipment structure, reduces equipment and maintenance costs, and reduces the potential risks caused by equipment failure.
Claims
1. A wastewater pretreatment flocculant dosing device, characterized in that, The system includes a wastewater pipe (1), a stainless steel pipe (2), a quick-connect pipe (4), a flocculant corrosion-resistant conveying pipe (5), and a flocculant corrosion-resistant dosing pipe (6). The stainless steel pipe (2) is welded through the wastewater pipe (1), and its outer end is welded and fixed to one side of the quick-connect pipe (4). The flocculant corrosion-resistant conveying pipe (5) is threadedly connected to the other side of the quick-connect pipe (4). The flocculant corrosion-resistant dosing pipe (6) is fitted inside the stainless steel pipe (2), with one end threadedly connected to the end of the quick-connect pipe (4), and the other end extending beyond the stainless steel pipe (2) to the end inside the wastewater pipe (1).
2. The wastewater pretreatment flocculant dosing device according to claim 1, characterized in that, The stainless steel pipe (2) and the flocculant corrosion-resistant dosing pipe (6) are respectively provided with a first elbow (21) and a second elbow (61) at the end positions inside the wastewater pipe (1). The orientation of the first elbow (21) and the second elbow (61) is consistent with the flow direction of the wastewater in the wastewater pipe (1).
3. The wastewater pretreatment flocculant dosing device according to claim 2, characterized in that, The first elbow (21) and the second elbow (61) are located on the central axis of the wastewater pipe (1).
4. The wastewater pretreatment flocculant dosing device according to claim 1, characterized in that, Both the flocculant corrosion-resistant conveying pipeline (5) and the flocculant corrosion-resistant dosing pipeline (6) are UPVC pipes.
5. The wastewater pretreatment flocculant dosing device according to claim 1, characterized in that, The flocculant corrosion-resistant conveying pipeline (5) and the flocculant corrosion-resistant dosing pipeline (6) are both DN20 pipes, and the stainless steel pipe (2) is a DN25 pipe.