Efficient fluorine removal system

Abstract

The utility model discloses an efficient defluorination system which comprises a coagulative precipitation tank, a wastewater inlet and a water outlet, the wastewater inlet is formed in one end of the coagulative precipitation tank, the wastewater inlet is provided with a flowmeter and an acidic fluorine removal agent adding port, an alkaline fluorine removal agent adding port is formed in the position, close to the wastewater inlet, of the coagulative precipitation tank, the water outlet is formed in the other end of the coagulative precipitation tank, and the water outlet is provided with an online fluorine ion detector and an online PH meter; and a stirrer is arranged on the coagulative precipitation tank close to the wastewater inlet. According to the device, the acidic fluorine removal agent and the alkaline fluorine removal agent are added in a combined manner, and the flow meter, the online fluorine ion detector and the online PH meter are combined, so that the dosages of the two fluorine removal agents can be accurately added, and the fluorine removal and high efficiency under ideal conditions are realized; excessive addition of chemicals can be avoided, the fluorine content of effluent reaches the standard, and the input cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field, specifically point to a kind of high-efficiency defluorination system. BACKGROUND

[0002] At present, the discharge standard of fluorine-containing wastewater is more and more strict in various places, especially in developed areas. The fluorine limit value of fluorine-containing wastewater discharged into municipal sewage plant by enterprises producing fluorine-containing wastewater has been reduced from 20 mg / L in the past to 5-10 mg / L or even lower. The fluorine limit value of fluorine-containing wastewater allowed to be directly discharged into natural water bodies in some places has been reduced to 1 or 1.5 mg / L.

[0003] At present, in order to reduce the fluorine content in wastewater from dozens to several mg / L or even lower, coagulation and sedimentation process is usually used. There are many types of defluorination agents on the market, and their application scope and defluorination effect are different. The using unit can only choose the defluorination agent recommended by the pharmaceutical factory because it cannot distinguish the good and bad. The on-site use of defluorination agent is mainly divided into two types: 1. Only one kind of agent is added, which is defluorination agent. At present, defluorination agent mainly using aluminum salt is used instead of coagulant to complete coagulation, sedimentation and clarification while defluorination. 2. Two kinds of agents are added, one is defluorination agent and the other is PH regulator. The former cannot guarantee the defluorination effect because the defluorination agent cannot be added under ideal conditions due to the change of wastewater quality. The latter can realize defluorination under suitable conditions by PH regulation, but the cost of PH regulation needs to be considered. CONTENT OF THE UTILITY MODEL

[0004] The technical problem to be solved by the utility model is to overcome the defects of the above-mentioned technology, and to provide a high-efficiency defluorination system which can guarantee that the effluent meets the standard and reduce the waste of agent.

[0005] In order to solve the above-mentioned technical problem, the utility model provides a high-efficiency defluorination system: including coagulation and sedimentation tank, wastewater inlet, outlet;

[0006] The wastewater inlet is arranged at one end of the coagulation and sedimentation tank, the wastewater inlet is provided with flowmeter and acidic defluorination agent adding port, the coagulation and sedimentation tank is provided with alkaline defluorination agent adding port near the wastewater inlet, the outlet is arranged at the other end of the coagulation and sedimentation tank, and the outlet is provided with online fluorine ion detector and online PH meter;

[0007] The coagulation and sedimentation tank is provided with stirrers near the wastewater inlet.

[0008] Further, the stirrers are provided with multiple.

[0009] Further, the alkaline defluorination agent adding port is arranged at a position between any adjacent stirrers, so that the alkaline defluorination agent added through the alkaline defluorination agent adding port can be mixed with wastewater under the stirring of the stirrers.

[0010] The utility model discloses a kind of high-efficiency defluorination systems, including coagulation sedimentation tank 1, wastewater inlet 2, outlet 3;Wastewater inlet 2 is located at one end of coagulation sedimentation tank 1, and wastewater inlet 2 is equipped with flowmeter 4, acidic defluorination agent adding port 5, and coagulation sedimentation tank 1 is equipped with alkaline defluorination agent adding port 6 near wastewater inlet 2, and outlet 3 is located at the other end of coagulation sedimentation tank 1, and outlet 3 is equipped with online fluorine ion detector 8, online PH meter 9;Coagulation sedimentation tank 1 is equipped with stirrer 10 near wastewater inlet 2. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a kind of high-efficiency defluorination system of the utility model.

[0012] As shown in the figure:

[0013] 1, coagulation sedimentation tank, 2, wastewater inlet, 3, outlet, 4, flowmeter, 5, acidic defluorination agent adding port, 6, alkaline defluorination agent adding port, 7, sludge discharge port, 8, online fluorine ion detector, 9, online PH meter, 10, stirrer, 11, stop valve, 12, inclined plate sedimentation zone. DETAILED DESCRIPTION

[0014] To make the purpose, technical scheme and advantage of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be described clearly and completely below in conjunction with the drawings in the utility model embodiment, and obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. The components of the utility model embodiment described and shown in the drawings here can be arranged and designed in various different configurations.

[0015] Embodiment 1, in conjunction with the drawings Figure 1 A kind of high-efficiency defluorination system, including coagulation sedimentation tank 1, wastewater inlet 2, outlet 3;

[0016] Wastewater inlet 2 is located at one end of coagulation sedimentation tank 1, and wastewater inlet 2 is equipped with flowmeter 4, acidic defluorination agent adding port 5, and coagulation sedimentation tank 1 is equipped with alkaline defluorination agent adding port 6 near wastewater inlet 2, and outlet 3 is located at the other end of coagulation sedimentation tank 1, and outlet 3 is equipped with online fluorine ion detector 8, online PH meter 9;

[0017] Coagulation sedimentation tank 1 is equipped with stirrer 10 near wastewater inlet 2.

[0018] In practice, the optimal pH values ​​for both the acidic and alkaline defluorinating agents are the same (e.g., both around 6.5). The overall defluorination effect is the sum of the dosages of the two agents. A combined application method using acidic and alkaline defluorinating agents is employed. For example, aluminum-based acidic defluorinating agent is added first, and after thorough mixing, aluminum-based alkaline defluorinating agent is added. The ideal pH conditions are achieved by varying the dosages of the acidic and alkaline agents, eliminating the need for additional acid or alkali additions. Both defluorinating agents can fully exert their defluorination effects, and ultimately, the defluorination effect is determined by the sum of the two under ideal conditions.

[0019] On-site application: The addition of both acidic and alkaline defluoridating agents is metered and controlled. A flow meter 4 is installed at wastewater inlet 2, and the dosage is proportional to the flow rate. The acidic and alkaline defluoridating agents are added one after the other near wastewater inlet 2 of the coagulation sedimentation tank 1, ensuring thorough mixing of the first agent before adding the second. Downstream, an online fluoride ion detector 8 and an online pH meter 9 are installed. The dosage of the acidic defluoridating agent is proportional to the influent flow rate, and this ratio is adjusted based on the readings of the online fluoride ion detector 8 and the set pH value. Similarly, the dosage of the alkaline defluoridating agent is also proportional to the influent flow rate, and this ratio is adjusted based on the readings of the online pH meter 9 and the set pH value. This ensures that both defluoridating agents work under optimal conditions, and the dosage is adjusted promptly according to changes in flow rate and water quality, thus guaranteeing effluent quality and avoiding agent waste. Among them, acidic defluorinating agents and alkaline defluorinating agents are added by dosage, that is, by adding them to the wastewater using a metering pump.

[0020] In this specific embodiment, multiple stirrers 10 are provided to fully mix the defluorinating agent with the wastewater.

[0021] In this specific embodiment, the alkaline defluorinating agent addition port 6 is located between any two adjacent stirrers 10, thereby ensuring that the alkaline defluorinating agent can be mixed with the wastewater under the stirring of the stirrer 10 after being added through the alkaline defluorinating agent addition port 6.

[0022] In this specific embodiment, the lower part of the downstream zone of the coagulation sedimentation tank 1 is provided with a sludge hopper and a sludge discharge port 7. The sludge discharge port 7 is provided with a shut-off valve 11, which can be opened periodically to discharge sludge.

[0023] In this specific embodiment, the upper part of the downstream zone of the coagulation sedimentation tank 1 is provided with an inclined plate sedimentation zone 12. Water flows through the inclined plate sedimentation zone 12 and is clarified, and then discharged through the outlet 3.

[0024] In the description of the embodiments of this utility model, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of this utility model, "a plurality of" means at least two.

[0027] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A high-efficiency defluorination system, characterized in that: It includes a coagulation sedimentation tank (1), a wastewater inlet (2), and an outlet (3); The wastewater inlet (2) is located at one end of the coagulation sedimentation tank (1). The wastewater inlet (2) is equipped with a flow meter (4) and an acidic defluoridating agent addition port (5). The coagulation sedimentation tank (1) is equipped with an alkaline defluoridating agent addition port (6) near the wastewater inlet (2). The outlet (3) is located at the other end of the coagulation sedimentation tank (1). The outlet (3) is equipped with an online fluoride ion detector (8) and an online pH meter (9). A stirrer (10) is provided near the wastewater inlet (2) of the coagulation sedimentation tank (1).

2. The high-efficiency defluorination system according to claim 1, characterized in that: The stirrer (10) is provided in multiple forms.

3. The high-efficiency defluorination system according to claim 2, characterized in that: The alkaline defluorinating agent addition port (6) is located between any two adjacent stirrers (10), thereby ensuring that the alkaline defluorinating agent can be mixed with the wastewater under the stirring of the stirrer (10) after being added through the alkaline defluorinating agent addition port (6).

4. The high-efficiency defluorination system according to claim 1, characterized in that: The downstream section of the coagulation sedimentation tank (1) is provided with a sludge hopper and a sludge discharge port (7), and the sludge discharge port (7) is provided with a shut-off valve (11).

5. The high-efficiency defluorination system according to claim 1, characterized in that: The downstream section of the coagulation sedimentation tank (1) is provided with an inclined plate sedimentation zone (12).

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