Treatment system for waste water containing fluoboric acid

Abstract

The utility model discloses a treatment system for waste water containing fluoboric acid, which comprises a waste water collecting tank used for storing waste water to be treated, a liquid outlet of the waste water collecting tank is connected with a fluoboric acid hydrolysis tank used for removing fluoboric acid in the waste water, and a liquid outlet of the fluoboric acid hydrolysis tank is connected with a fluorine removal reaction tank used for further removing fluorine. A liquid outlet of the defluorination reaction tank is connected with a flocculation tank for carrying out flocculation reaction on the defluorination wastewater. According to the utility model, the limit removal of fluoboric acid and fluorine ions can be realized, the effective removal of boric acid can also be realized, and the environmental hazard caused by neglect of the removal of boric acid in the conventional fluoboric acid treatment process is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wastewater treatment system, especially to a fluorine-containing boric acid wastewater treatment system. BACKGROUND

[0002] Fluoroboric acid (HBF4) has a fast deposition rate and good stability, and is widely used in industries such as electroplating, semiconductor production, metal processing, and glass manufacturing. For example, in the electroplating industry, fluoroboric acid is often used to prepare electroplating solution and pretreat metal surfaces; in the semiconductor production process, fluoroboric acid can be used to clean the oxides of crystalline silicon; in the glass manufacturing industry, fluoroboric acid can be used to etch glass and remove impurities on the surface of glass, improving the performance of glass. However, fluoroboric acid is highly toxic and has strong corrosive properties, and excessive exposure can cause serious environmental harm and even harm human health.

[0003] However, there is still a large research gap in the treatment of fluorine-containing boric acid wastewater. In the currently disclosed utility model patents, patent CN215403265U discloses a device that can be used to treat fluorine-containing boric acid wastewater, which fully utilizes the heat generated during the reaction of raw materials to heat the fluorine-containing boric acid wastewater, without the need for additional heat sources. However, this device does not focus on the deep removal of fluoroboric acid, fluoride ions, and boric acid, and the fluoroboric pollutants in the effluent water will still cause further harm to the environment.

[0004] Therefore, there is an urgent need to develop a fluorine-containing boric acid wastewater treatment system that can completely remove fluoroboric acid pollutants from wastewater. UTILITY MODEL CONTENT

[0005] The utility model aims to provide a fluorine-containing boric acid wastewater treatment system that can perform deep treatment on wastewater.

[0006] Technical solution: The fluorine-containing boric acid wastewater treatment system of the utility model comprises a wastewater collection tank for storing wastewater to be treated, a fluoroboric acid hydrolysis tank connected to the liquid outlet of the wastewater collection tank for removing fluoroboric acid from the wastewater, a defluorination reaction tank connected to the liquid outlet of the fluoroboric acid hydrolysis tank for further removing fluoride, and a flocculation tank connected to the liquid outlet of the defluorination reaction tank for flocculation reaction on the wastewater after defluorination.

[0007] Among them, defluorination reagent is added to the defluorination reaction tank; the defluorination reagent can be a defluorination reagent in the prior art, such as metaborate defluorination agent.

[0008] Among them, the output of the flocculation tank is connected to a sedimentation tank for sedimentation of the flocculated reaction liquid.

[0009] The output of the sedimentation tank is connected with a defluorination and deboron resin tower for further deboron of the supernatant after sedimentation; the defluorination and deboron resin tower is a three-layer structure, the upper layer is loaded with deboron resin and is a deboron resin layer, the middle layer is loaded with quartz sand and is a quartz sand layer, and the lower layer is loaded with defluorination resin and is a defluorination resin layer.

[0010] The output of the defluorination and deboron resin tower is connected with a discharge tank for collecting the treated wastewater.

[0011] The defluorination and deboron resin tower is connected with a discharge tank for collecting the treated wastewater.

[0012] Beneficial effects: compared with the prior art, the fluoroboric acid-containing wastewater treatment system of the utility model has the following remarkable effects: (1) the fluoroboric acid-containing wastewater treatment system of the utility model firstly sets a fluoroboric acid hydrolysis tank after the wastewater collection tank, which not only plays a role of water quality adjustment, but also makes the fluoroboric acid in the wastewater pre-hydrolyze, so as to facilitate further removal in subsequent reactions; the defluorination and deboron resin tower is a three-layer structure, the upper layer is a deboron resin layer, the middle layer is a quartz sand layer, and the lower layer is a defluorination resin layer, which can realize extreme removal of fluoroboric acid and fluoride ions and effective removal of boric acid, thereby avoiding environmental hazards caused by neglecting removal of boric acid in conventional fluoroboric acid treatment processes; (2) the treatment system of the utility model can simultaneously remove fluoroboric acid, boric acid, fluoroboric acid ions, fluoride ions and other pollutants in fluoroboric acid-containing wastewater, which is beneficial to improving wastewater treatment efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a system structure schematic view of the utility model;

[0014] Figure 2 It is a defluorination and deboron resin tower structure schematic view of the utility model. DETAILED DESCRIPTION

[0015] The technical scheme of the utility model will be further described below in combination with the drawings of the specification.

[0016] As Figure 1 , 2The utility model provides a kind of fluoroboric acid wastewater treatment system, including wastewater collection tank 1 for storing wastewater to be treated, the effluent of wastewater collection tank 1 is connected with fluoroboric acid hydrolysis pool 2 for removing fluorine and boric acid in wastewater, pH sensor is equipped in fluoroboric acid hydrolysis pool 2 for monitoring the pH of solution in fluoroboric acid hydrolysis pool 2.The effluent of fluoroboric acid hydrolysis pool 2 is connected with defluorination reaction pool 3 for further defluorination, the effluent of defluorination reaction pool 3 is connected with flocculation pool 4 for flocculation reaction to wastewater after defluorination.The output of flocculation pool 4 is connected with precipitation tank 5 for the flocculation reaction liquid after flocculation to carry out precipitation.The output of precipitation tank 5 is connected with defluorination boric resin tower 6 for further removing fluorine and boric to supernatant after precipitation.The defluorination boric resin tower 6 is equipped with three layers structure of upper, middle and lower, the upper layer is filled with boric removal resin, and is boric removal resin layer 61;The middle layer is filled with quartz sand, and is quartz sand layer 62;The lower layer is filled with defluorination resin, and is defluorination resin layer 63.Boric removal resin and defluorination resin are respectively boric removal resin and defluorination resin commonly used in prior art, and the boric removal resin of the embodiment is polyhydroxy amine styrene boric removal resin, and the defluorination resin is amino phosphonic acid type aluminum-loaded chelation defluorination resin.The output of defluorination boric resin tower 6 is connected with discharge tank 7 for collecting wastewater after treatment.

[0017] The method for treating wastewater by the above system comprises the following steps:

[0018] (1) fluoroboric acid wastewater is self-flowing into fluoroboric acid hydrolysis pool 2 after passing through wastewater collection tank 1, and 30% mass fraction of NaOH is added into fluoroboric acid hydrolysis pool 2 to adjust the pH in the pool to 7-8, and after sufficient reaction, it is self-flowing into defluorination reaction pool 3;

[0019] (2) 20-40% mass fraction of sodium metaaluminate is added into defluorination reaction pool 3 as a defluorination agent to further decompose fluoroboric acid and remove fluorine ions synchronously, and after sufficient reaction, it enters flocculation pool 4;

[0020] (3) 30% mass fraction of NaOH is added into flocculation pool 4 to adjust the pH to 6.5-7.5, and the pH sensor in flocculation pool 4 is used to maintain the pH in the pool stable, and a flocculant is added to carry out flocculation reaction, and after sufficient flocculation, it enters precipitation tank;

[0021] (4) the precipitation time in the precipitation tank is not less than 60 min, and then the supernatant enters defluorination boric resin tower 6, and sequentially passes through boric removal resin layer 61 in the upper layer, quartz sand layer 62 in the middle layer and defluorination resin layer 63 in the lower layer, and the running time is 15-20 h, and after the resin is completely adsorbed and saturated, the fluorine ion concentration, fluoroboric acid concentration and boric acid concentration in the wastewater flowing into discharge tank are measured.

Claims

1. A system for treating fluorine-containing boric acid waste water, characterized by comprising: The application relates to a wastewater treatment device, which comprises a wastewater collecting tank (1) for storing wastewater to be treated, a fluoroboric acid hydrolysis tank (2) connected with the liquid outlet of the wastewater collecting tank (1) and used for removing fluoroboric acid in the wastewater, a pH sensor arranged in the fluoroboric acid hydrolysis tank (2) and used for monitoring the pH of the solution in the fluoroboric acid hydrolysis tank (2), a defluorination reaction tank (3) connected with the liquid outlet of the fluoroboric acid hydrolysis tank (2) and used for further removing fluorine, a flocculation tank (4) connected with the liquid outlet of the defluorination reaction tank (3) and used for carrying out flocculation reaction on the wastewater after defluorination, a sedimentation tank (5) connected with the liquid outlet of the flocculation tank (4) and used for carrying out sedimentation on the reaction liquid after flocculation, a defluoroboric resin tower (6) connected with the liquid outlet of the sedimentation tank (5) and used for further removing fluoroboric acid from the supernatant after sedimentation, and the defluoroboric resin tower (6) is a three-layer structure, the upper layer is filled with defluoroboric resin and is a defluoroboric resin layer (61), the middle layer is filled with quartz sand and is a quartz sand layer (62), and the lower layer is filled with defluorination resin and is a defluorination resin layer (63).

2. The system for treating fluoro-boric acid waste water according to claim 1, wherein The liquid outlet of the defluoroboric resin tower (6) is connected with a discharge tank (7) used for collecting the treated wastewater.

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