Automatic fluorine-containing liquid deep treatment device and method

Abstract

The invention relates to the technical field of waste liquid treatment, in particular to an automatic fluorine-containing liquid advanced treatment device and method.The automatic fluorine-containing liquid advanced treatment device comprises a waste water collection pool, a three-stage sedimentation pool, a flocculant stirring pool, a clarification pool, a mixed reaction pool and a filter press; the wastewater collection tank, the three-stage sedimentation tank, the flocculant stirring tank, the clarification tank, the mixed reaction tank and the filter press are sequentially arranged from left to right, and the wastewater collection tank, the three-stage sedimentation tank, the flocculant stirring tank, the clarification tank, the mixed reaction tank and the filter press are matched for use; therefore, suspended solids and colloidal particles in the fluorine-containing wastewater can be removed by adopting a mode of combining gravity settling and flocculant putting, and after the suspended solids and colloidal particles in the fluorine-containing wastewater are removed, fluorine ions in the fluorine-containing wastewater are converted into insoluble fluorides to be precipitated by putting the fluorine removal liquid, and finally the insoluble fluorides are removed. Therefore, the removal rate of fluorine ions in the fluorine-containing wastewater can be increased, and the treatment effect of the fluorine-containing wastewater is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste liquid treatment, and in particular to an automated fluorine-containing liquid deep treatment device and method. Background Art

[0002] In recent years, with the rapid development of the fluorine chemical industry, the discharge of fluorine-containing wastewater has posed a threat to the ecological environment and has become the biggest obstacle to the sustainable development of the industry. The fluorine-containing waste gas, waste liquid and waste residue discharged into the ecological environment are likely to cause poisoning of surrounding humans and livestock, and ultimately lead to endemic fluorosis. The overall structure of the existing fluorine wastewater deep treatment device is relatively complex, and the fluorine-containing wastewater cannot be filtered before and after treatment. In addition, the amount of auxiliary agents cannot be effectively controlled, which can easily lead to excessive use of auxiliary agents and waste.

[0003] Prior art CN216377706U discloses a high-concentration fluorine-containing wastewater deep treatment device, which is provided with a filter tank, a filter screen and a sedimentation tank. The fluorine-containing wastewater enters the filter tank through a pipeline and is filtered by the filter screen. The filter screen can filter out impurities and particulate matter in the fluorine-containing wastewater. The filtered fluorine-containing wastewater enters the mixing box. The first partition can block the impurities and particulate matter filtered out and make them fall into the filter tank. The personnel can open the tank cover to clean the impurities and particulate matter. The lime milk in the reagent box falls into the mixing box through the feed pipe. The fluorine-containing wastewater after settling in the sedimentation box overflows the second partition and is The filter blocks No. 1 and No. 2 are used for filtering, so the fluorine-containing wastewater can be effectively treated. In addition, by arranging a rotating rod, a toggle plate, a sealing plug plate and a compression spring, when the fluorine-containing wastewater flows into the mixing box, it will push the multiple toggle plates outside the rotating rod to rotate. The rotation of the toggle plate drives the sealing plug plate to move through the toggle block. When the sealing plug plate is moved out of the discharge pipe, the lime milk in the reagent box will flow into the mixing box through the discharge pipe. After the toggle plate rotates and leaves the toggle block, the compression spring pushes the sealing plug plate to be inserted into the discharge pipe to seal the discharge pipe. The amount of lime milk can be controlled according to the amount of fluorine-containing wastewater entering the mixing box.

[0004] However, the above-mentioned fluorine-containing wastewater deep treatment device mostly uses calcium salt coagulation to treat fluorine-containing wastewater, that is, adding lime to the wastewater to make fluoride ions and calcium ions generate CaF 2 However, this single coagulation and sedimentation method is difficult to completely treat the high molecular fluoride and high molecular organic matter in the fluoride-containing wastewater, resulting in unsatisfactory treatment effect of fluoride-containing wastewater. Summary of the invention

[0005] The purpose of the present invention is to provide an automated fluorine-containing liquid deep treatment device and method, which solves the problem that most of the existing fluorine-containing wastewater deep treatment methods use calcium salt coagulation, that is, adding lime to the wastewater to make fluoride ions react with calcium ions to generate CaF2 However, this single coagulation and sedimentation method is difficult to completely treat the high molecular fluoride and high molecular organic matter in the fluoride-containing wastewater, resulting in the technical problem of unsatisfactory treatment effect of fluoride-containing wastewater.

[0006] To achieve the above-mentioned purpose, the present invention provides an automated fluorine-containing liquid deep treatment device, comprising a wastewater collection tank, a three-stage sedimentation tank, a flocculant stirring tank, a clarification tank, a mixing reaction tank and a filter press, wherein the wastewater collection tank, the three-stage sedimentation tank, the flocculant stirring tank, the clarification tank, the mixing reaction tank and the filter press are arranged in sequence from left to right; the wastewater collection tank is used to centrally collect fluorine-containing wastewater, the three-stage sedimentation tank is used to remove large suspended particles in the wastewater by gravity sedimentation, the flocculant stirring tank is used to allow the flocculant to make tiny suspended matter and colloidal particles in the water form larger floccules by stirring, the clarification tank is used to further sediment and remove suspended matter and colloidal substances, the mixing reaction tank is used to allow the added defluorination liquid to be fully mixed with the wastewater, and the filter press is used to perform solid-liquid separation on the treated wastewater, and collect the precipitate and the filtrate respectively.

[0007] Wherein, the automated fluorine-containing liquid deep processing device further comprises a detection tank, which is arranged on a side of the filter press away from the mixing reaction tank and is used to detect the fluorine content of the filtrate.

[0008] The present invention also provides an automated fluorine-containing liquid deep treatment method, comprising the following steps:

[0009] Collect fluoride-containing wastewater and ensure that it is effectively managed before treatment to prevent spillage and spread of pollution;

[0010] After a suitable amount of the fluorine-containing wastewater is collected, performing preliminary pretreatment on the fluorine-containing wastewater;

[0011] Adding a defluorination liquid to the pretreated fluorine-containing wastewater, allowing the defluorination liquid to fully mix and react with the fluorine-containing wastewater, converting fluoride ions in the fluorine-containing wastewater into insoluble fluoride and precipitating the fluoride;

[0012] The treated fluorine-containing wastewater is subjected to solid-liquid separation, and the precipitate and the filtrate are collected separately, thereby completing the automated deep treatment of the fluorine-containing wastewater.

[0013] Wherein, the specific steps of preliminary pretreatment of the fluorine-containing wastewater are:

[0014] Removing large suspended particles in the fluorine-containing wastewater by gravity sedimentation, and taking the supernatant after sedimentation;

[0015] Adding flocculant to the supernatant, stirring to make the tiny suspended matter and colloidal particles in the water form larger flocs, and taking the supernatant;

[0016] The supernatant is further precipitated to remove small suspended particles and colloidal substances in the water, and the supernatant is taken.

[0017] Wherein, the flocculant added to the supernatant is polyaluminium chloride.

[0018] Wherein, the defluorination liquid added to the pretreated fluorine-containing wastewater is one or more of calcium-based, aluminum-based or iron-based defluorination agents.

[0019] Among them, after the fluorine-containing wastewater is subjected to solid-liquid separation to obtain a precipitate and a filtrate respectively, the filtrate needs to be tested for fluorine content to ensure that the treated fluorine-containing wastewater meets the ultra-low emission standard.

[0020] The present invention discloses an automatic fluorine-containing liquid deep treatment device and method. Through the coordinated use of the wastewater collection tank, the three-stage sedimentation tank, the flocculant stirring tank, the clarification tank, the mixing reaction tank and the filter press, the suspended matter and colloidal particles in the fluorine-containing wastewater can be removed by combining gravity sedimentation with the addition of flocculants. After the suspended matter and colloidal particles in the fluorine-containing wastewater are removed, the fluorine ions in the fluorine-containing wastewater are converted into insoluble fluoride and precipitated, and finally removed, thereby improving the removal rate of fluorine ions in the fluorine-containing wastewater, thereby improving the treatment effect of the fluorine-containing wastewater, and solving the problem that the existing fluorine-containing wastewater deep treatment device for the deep treatment of fluorine-containing wastewater mostly uses the calcium salt coagulation method, that is, adding lime into the wastewater to make fluorine ions and calcium ions generate CaF 2 However, this single coagulation and sedimentation method is difficult to completely treat the high molecular fluoride and high molecular organic matter in the fluoride-containing wastewater, resulting in the technical problem of unsatisfactory treatment effect of fluoride-containing wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0022] Figure 1 It is a schematic diagram of the structure of the automated fluorine-containing liquid deep treatment device according to the first embodiment of the present invention.

[0023] Figure 2 It is a flow chart of the steps of the automated fluorine-containing liquid deep treatment method according to the second embodiment of the present invention.

[0024] Figure 3 It is a diagram of specific steps for preliminary pretreatment of the fluorine-containing wastewater in the automated fluorine-containing liquid deep treatment method according to the third embodiment of the present invention.

[0025] In the figure: 101-wastewater collection tank, 102-tertiary sedimentation tank, 103-flocculant stirring tank, 104-clarification tank, 105-mixing reaction tank, 106-filter press, 107-detection tank. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0027] First embodiment:

[0028] See also Figure 1 The present invention provides an automated fluorine-containing liquid deep treatment device, comprising a wastewater collection tank 101, a three-stage sedimentation tank 102, a flocculant stirring tank 103, a clarification tank 104, a mixing reaction tank 105, a filter press 106 and a detection tank 107.

[0029] In this embodiment, by using the wastewater collection tank 101, the three-stage sedimentation tank 102, the flocculant stirring tank 103, the clarification tank 104, the mixing reaction tank 105, and the filter press 106 in coordination, the suspended matter and colloidal particles in the fluoride-containing wastewater can be removed by combining gravity sedimentation with the addition of flocculants. After the suspended matter and colloidal particles in the fluoride-containing wastewater are removed, the fluoride ions in the fluoride-containing wastewater are converted into insoluble fluoride and precipitated, and finally removed, thereby improving the removal rate of fluoride ions in the fluoride-containing wastewater, thereby improving the treatment effect of the fluoride-containing wastewater, and solving the problem that the existing fluoride-containing wastewater deep treatment device for the deep treatment of fluoride-containing wastewater mostly uses the calcium salt coagulation method, that is, adding lime to the wastewater to make fluoride ions and calcium ions generate CaF 2 However, this single coagulation and sedimentation method is difficult to completely treat the high molecular fluoride and high molecular organic matter in the fluoride-containing wastewater, resulting in the technical problem of unsatisfactory treatment effect of fluoride-containing wastewater.

[0030] Among them, the wastewater collection tank 101, the tertiary sedimentation tank 102, the flocculant stirring tank 103, the clarification tank 104, the mixing reaction tank 105 and the filter press 106 are arranged in sequence from left to right. The wastewater collection tank 101 is used to centrally collect fluorine-containing wastewater, the tertiary sedimentation tank 102 is used to remove large suspended particles in the wastewater by gravity sedimentation, the flocculant stirring tank 103 is used to stir the flocculant to make the tiny suspended matter and colloidal particles in the water form larger floccules, the clarification tank 104 is used to further sediment and remove suspended matter and colloidal substances, the mixing reaction tank 105 is used to fully mix the added defluorination liquid with the wastewater, and the filter press 106 is used to perform solid-liquid separation on the treated wastewater, and collect the precipitate and the filtrate respectively.

[0031] Secondly, the automated fluorine-containing liquid deep treatment device further comprises a detection tank 107 , which is disposed on a side of the filter press 106 away from the mixing reaction tank 105 and is used to detect the fluorine content of the filtrate.

[0032] When using the automated fluorine-containing liquid deep treatment device of this embodiment, first, the fluorine-containing wastewater is collected using the wastewater collection pool 101 to ensure that the fluorine-containing wastewater can be effectively managed before treatment to prevent the fluorine-containing wastewater from overflowing and spreading pollution.

[0033] The fluorine-containing wastewater collected in the wastewater collection tank 101 is then transferred to the tertiary sedimentation tank 102, and large suspended particles in the fluorine-containing wastewater are removed by gravity sedimentation, and the supernatant is taken after sedimentation, wherein each sedimentation tank of the tertiary sedimentation tank 102 can be set with different residence time and flow rate to improve the sedimentation efficiency of the fluorine-containing wastewater.

[0034] Afterwards, the supernatant from which the large suspended particles in the fluorine-containing wastewater are removed is transferred to the flocculant stirring tank 103, and flocculant is added to the flocculant stirring tank 103. The tiny suspended matter and colloidal particles in the water are stirred to form larger floccules for subsequent precipitation. After flocculation, the supernatant is taken, wherein the flocculant is polyaluminium chloride.

[0035] Subsequently, after the tiny suspended matter and colloidal particles in the fluorine-containing wastewater are removed by flocculation, the supernatant is transferred to the clarification tank 104, and the supernatant is further subjected to gravity sedimentation in the clarification tank 104, so as to further remove the suspended matter and colloidal substances and reduce the turbidity of the fluorine-containing wastewater.

[0036] After the clarification tank 104 discharges water, the fluorine-containing wastewater is transferred to the mixing reaction tank 105, and a defluorination liquid is added to the mixing reaction tank 105, so that the defluorination liquid and the fluorine-containing wastewater are fully mixed and reacted, so that the fluoride ions in the fluoride-containing wastewater can be converted into insoluble fluorides and precipitated, thereby improving the removal rate of fluoride ions, wherein the defluorination liquid is one or more of a calcium-based, aluminum-based or iron-based defluorination agent.

[0037] After the reaction, the fluorine-containing wastewater is transferred to the filter press 106, and the filter press 106 is used to perform solid-liquid separation on the fluorine-containing wastewater. After the solid-liquid separation, the precipitate (fluorine-containing sludge) is collected, and a relatively clear filtrate is obtained. Thereafter, the filtrate is transferred to the detection tank 107, and the fluorine content of the obtained filtrate is tested in the detection tank 107 to ensure that the treated fluorine-containing wastewater meets the ultra-low emission standard (fluorine content <2ppm). The qualified filtrate that meets the ultra-low emission standard can be recycled as cooling water, thereby reducing the consumption of water resources.

[0038] Second embodiment:

[0039] Based on the first embodiment, please refer to Figure 2 and Figure 3 The present invention also provides an automated fluorine-containing liquid deep treatment method, comprising the following steps:

[0040] S1. Collect fluorine-containing wastewater and ensure that it is effectively managed before treatment to prevent overflow and spread of pollution.

[0041] Specifically, the wastewater collection pool 101 is used to collect the fluorine-containing wastewater to ensure that the fluorine-containing wastewater can be effectively managed before being treated to prevent the fluorine-containing wastewater from overflowing and polluting.

[0042] S2. After collecting a suitable amount of the fluorine-containing wastewater, pre-treating the fluorine-containing wastewater.

[0043] Specifically, the specific steps of pre-treating the fluorine-containing wastewater are:

[0044] S21. Remove large suspended solids in the fluorine-containing wastewater by gravity sedimentation, and take the supernatant after sedimentation.

[0045] Specifically, the fluorine-containing wastewater collected in the wastewater collection tank 101 is transferred to the tertiary sedimentation tank 102, and large suspended particles in the fluorine-containing wastewater are removed by gravity sedimentation, and after sedimentation, the supernatant is taken, wherein each sedimentation tank of the tertiary sedimentation tank 102 can be set with different residence time and flow rate to improve the sedimentation efficiency of the fluorine-containing wastewater.

[0046] S22, adding a flocculant to the supernatant, stirring the micro suspended matter and colloidal particles in the water to form larger flocs, and taking the supernatant.

[0047] Specifically, the supernatant from which large suspended particles in the fluorine-containing wastewater are removed is transferred to the flocculant stirring tank 103, and flocculant is added to the flocculant stirring tank 103. The tiny suspended particles and colloidal particles in the water are stirred to form larger floccules for subsequent precipitation. After flocculation, the supernatant is taken, wherein the flocculant is polyaluminium chloride.

[0048] S23, further sedimenting the supernatant to remove small suspended particles and colloidal substances in the water, and taking the supernatant.

[0049] Specifically, after the tiny suspended matter and colloidal particles in the fluorine-containing wastewater are removed by flocculation, the supernatant is transferred to the clarification tank 104, and the supernatant is further subjected to gravity sedimentation in the clarification tank 104, so as to further remove the suspended matter and colloidal substances and reduce the turbidity of the fluorine-containing wastewater.

[0050] S3. Adding a defluorination liquid to the pretreated fluorine-containing wastewater, allowing the defluorination liquid and the fluorine-containing wastewater to fully mix and react, converting the fluoride ions in the fluorine-containing wastewater into insoluble fluoride and precipitating them.

[0051] Specifically, after the clarification tank 104 discharges water, the fluorine-containing wastewater is transferred to the mixing reaction tank 105, and a defluorination liquid is added to the mixing reaction tank 105, so that the defluorination liquid and the fluorine-containing wastewater are fully mixed and reacted, so that the fluoride ions in the fluoride-containing wastewater can be converted into insoluble fluorides and precipitated, thereby improving the removal rate of fluoride ions, wherein the defluorination liquid is one or more of a calcium-based, aluminum-based or iron-based defluorination agent.

[0052] S4, performing solid-liquid separation on the treated fluorine-containing wastewater, and collecting the precipitate and the filtrate respectively, to complete the automated deep treatment of the fluorine-containing wastewater.

[0053] Specifically, after the reaction, the fluorine-containing wastewater is transferred to the filter press 106, and the filter press 106 is used to perform solid-liquid separation on the fluorine-containing wastewater. After the solid-liquid separation, the precipitate (fluorine-containing sludge) is collected to obtain a relatively clear filtrate. Thereafter, the filtrate is transferred to the detection tank 107, and the fluorine content of the obtained filtrate is tested in the detection tank 107 to ensure that the treated fluorine-containing wastewater meets the ultra-low emission standard (fluorine content <2ppm). The qualified filtrate that meets the ultra-low emission standard can be recycled as cooling water, thereby reducing the consumption of water resources.

[0054] When using an automated fluorine-containing liquid deep treatment method of the present embodiment, suspended matter and colloidal particles in the fluorine-containing wastewater are removed by combining gravity sedimentation with the addition of flocculants. After the suspended matter and colloidal particles in the fluorine-containing wastewater are removed, the fluorine ions in the fluorine-containing wastewater are converted into insoluble fluoride precipitates by adding defluorination liquid, and finally removed, thereby improving the removal rate of fluorine ions in the fluorine-containing wastewater and further improving the treatment effect of the fluorine-containing wastewater.

[0055] The automated fluorine-containing liquid deep treatment method adopted by the present invention has the following advantages:

[0056] High-efficiency defluorination technology: Introducing specific defluorination liquid as a key step in deep treatment can significantly reduce the fluoride content in the waste liquid from 6ppm to below 2ppm compared to the traditional neutralization precipitation method, meeting more stringent environmental protection standards. This defluorination liquid may contain highly selective fluoride ion adsorbents or complexing agents that can efficiently capture and remove fluoride ions.

[0057] Resource utilization: The treated low-fluorine waste liquid not only meets the ultra-low emission standards, but also has the potential to be reused as cooling water, realizing the transformation from "wastewater" to "resources", reducing the consumption of fresh water resources and the cost of wastewater treatment.

[0058] Treatment efficiency: Fluoride ion removal rate ≥ 90%, fluorine content in the treated waste liquid ≤ 2ppm.

[0059] Outlet water quality: Except for fluoride, other water quality indicators (such as COD, BOD, SS, heavy metals, etc.) must meet the relevant national ultra-low emission standards or higher standards.

[0060] Resource recovery rate: Cooling water reuse rate ≥ 80%, maximizing waste liquid resource utilization.

[0061] Energy consumption and cost: The unit wastewater treatment energy consumption is reduced by at least 10% compared with traditional processes, and the comprehensive treatment cost is controlled within a reasonable range.

[0062] Automation degree: realize full automatic control, reduce manual operation, and improve processing efficiency and safety.

[0063] Environmental friendliness: No secondary pollution is generated during the treatment process, and all waste is properly treated or recycled.

[0064] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. An automated fluorine-containing liquid deep treatment device, characterized in that: It includes a wastewater collection tank, a three-stage sedimentation tank, a flocculant stirring tank, a clarification tank, a mixing reaction tank and a filter press, wherein the wastewater collection tank, the three-stage sedimentation tank, the flocculant stirring tank, the clarification tank, the mixing reaction tank and the filter press are arranged in sequence from left to right; The wastewater collection tank is used for collecting fluorine-containing wastewater in a centralized manner, the three-stage sedimentation tank is used for removing large suspended particles in the wastewater by gravity sedimentation, the flocculant stirring tank is used for stirring the tiny suspended particles and colloidal particles in the water to form larger floccules by the flocculant, the clarification tank is used for further sedimentation to remove suspended particles and colloidal substances, the mixing reaction tank is used for fully mixing the added defluorination liquid with the wastewater, and the filter press is used for solid-liquid separation of the treated wastewater and collecting the precipitate and the filtrate respectively.

2. The automated fluorine-containing liquid deep processing device according to claim 1, characterized in that: The automated fluorine-containing liquid deep processing device also includes a detection tank, which is arranged on a side of the filter press away from the mixing reaction tank and is used to detect the fluorine content of the filtrate.

3. An automated fluorine-containing liquid deep treatment method, applied to the automated fluorine-containing liquid deep treatment device according to any one of claim 1 or claim 2, characterized in that: The following steps are involved: Collect fluoride-containing wastewater and ensure that it is effectively managed before treatment to prevent spillage and spread of pollution; After a suitable amount of the fluorine-containing wastewater is collected, performing preliminary pretreatment on the fluorine-containing wastewater; Adding a defluorination liquid to the pretreated fluorine-containing wastewater, allowing the defluorination liquid to fully mix and react with the fluorine-containing wastewater, converting fluoride ions in the fluorine-containing wastewater into insoluble fluoride and precipitating the fluoride; The treated fluorine-containing wastewater is subjected to solid-liquid separation, and the precipitate and the filtrate are collected separately, thereby completing the automated deep treatment of the fluorine-containing wastewater.

4. The automated fluorine-containing liquid deep treatment method according to claim 3, characterized in that: The specific steps of pre-treating the fluorine-containing wastewater are: Removing large suspended particles in the fluorine-containing wastewater by gravity sedimentation, and taking the supernatant after sedimentation; Adding flocculant to the supernatant, stirring to make the tiny suspended matter and colloidal particles in the water form larger flocs, and taking the supernatant; The supernatant is further precipitated to remove small suspended particles and colloidal substances in the water, and the supernatant is taken.

5. The automated fluorine-containing liquid deep treatment method according to claim 4, characterized in that: The flocculant added to the supernatant is polyaluminium chloride.

6. The automated fluorine-containing liquid deep treatment method according to claim 3, characterized in that: The defluorination liquid added to the pretreated fluorine-containing wastewater is one or more of calcium-based, aluminum-based or iron-based defluorination agents.

7. The automated fluorine-containing liquid deep treatment method according to claim 3, characterized in that: After the fluorine-containing wastewater is subjected to solid-liquid separation to obtain a precipitate and a filtrate, the filtrate needs to be tested for fluorine content to ensure that the treated fluorine-containing wastewater meets the ultra-low emission standard.

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