A defluorination method and system based on backflow flocculation precipitation treatment

Abstract

The application discloses a kind of defluorination method and system based on reflux flocculation sedimentation treatment, the method includes the following steps: setting first fluorine content index value and error threshold;Determine the first fluorine content of sample to be treated;Based on the first fluorine content index value, error threshold and first fluorine content, set defluorination mode;Prepare first reaction reagent and second reaction reagent;Set reflux calculation formula and reflux cycle;Based on defluorination mode, first reaction reagent, second reaction reagent, reflux calculation formula and reflux cycle, carry out reflux flocculation sedimentation treatment to sample to be treated, obtain defluorination sample;The application can improve flocculation sedimentation process by reflux treatment, and by independently designed reflux flow calculation formula, accurate and suitable reflux flow value is calculated, finally the moisture content of product in sedimentation tank is improved, the concentration of suspended particulate matter in the output defluorinated water sample is reduced, the defluorination cost is reduced, with very high application and cost performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluoride removal, in particular to a fluoride removal method and system based on reflux flocculation and sedimentation treatment. BACKGROUND

[0002] At present, the traditional fluoride removal process adopts a relatively cumbersome flocculation and sedimentation process, which obtains liquid purified water samples by flocculating and sedimentating the sample and then performing phased sludge discharge; although this method has a simple process, the water content in the sludge discharge process is low, resulting in a large selection of pressure filters, and the surface hydraulic load of the sedimentation container in the flocculation and sedimentation process is low, which leads to high construction cost, and the concentration of suspended particles in the water sample produced by the traditional fluoride removal process is also high.

[0003] In summary, the traditional fluoride removal process has poor fluoride removal quality, high concentration of suspended particles in the produced fluoride removal water sample, high equipment cost of the entire fluoride removal process, and low application and cost performance. SUMMARY

[0004] The present application mainly solves the problems of poor fluoride removal quality, high concentration of suspended particles in the produced fluoride removal water sample, high equipment cost of the entire fluoride removal process, and low application and cost performance of the traditional fluoride removal process.

[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a fluoride removal method based on reflux flocculation and sedimentation treatment, comprising the following steps:

[0006] A fluoride removal mode setting step:

[0007] Setting a first fluoride content index value and an error threshold value; determining the first fluoride content of a sample to be treated; setting a fluoride removal mode based on the first fluoride content index value, the error threshold value, and the first fluoride content;

[0008] A flocculation and sedimentation treatment step:

[0009] Preparation of first and second reaction reagents; setting a reflux calculation formula and a reflux cycle; performing reflux flocculation and sedimentation treatment on the sample to be treated based on the fluoride removal mode, the first reaction reagent, the second reaction reagent, the reflux calculation formula, and the reflux cycle to obtain a fluoride removal sample.

[0010] As an improved solution, the fluoride removal mode includes a primary mode and a secondary mode.

[0011] The step of setting a fluoride removal mode based on the first fluoride content index value, the error threshold value, and the first fluoride content further includes:

[0012] determining whether the first fluorine content is not greater than the first fluorine content index value;

[0013] If yes, the defluorination mode is set to the first-level mode.

[0014] If no, the difference between the first fluorine content and the first fluorine content index value is calculated, and it is determined whether the difference is not greater than the error threshold value; if the difference is not greater than the error threshold value, the defluorination mode is set to the first-level mode; if the difference is greater than the error threshold value, the defluorination mode is set to the second-level mode.

[0015] As an improved scheme, the step of performing the reflux flocculation and sedimentation treatment on the sample to be treated based on the defluorination mode, the first reaction reagent, the second reaction reagent, the reflux calculation formula, and the reflux cycle to obtain a defluorinated sample further comprises:

[0016] If the defluorination mode is the first-level mode, the reflux flocculation and sedimentation treatment is performed on the sample to be treated based on the first reaction reagent, the reflux calculation formula, and the reflux cycle to obtain the defluorinated sample.

[0017] If the defluorination mode is the second-level mode, first, the reflux flocculation and sedimentation treatment is performed on the sample to be treated based on the first reaction reagent, the reflux calculation formula, and the reflux cycle to obtain a first-level defluorinated product; then, the reflux flocculation and sedimentation treatment is performed on the first-level defluorinated product based on the second reaction reagent, the reflux calculation formula, and the reflux cycle to obtain a second-level defluorinated product; and the second-level defluorinated product is set as the defluorinated sample.

[0018] As an improved scheme, the reflux flocculation and sedimentation treatment based on the first reaction reagent comprises:

[0019] A first pH adjustment index and a first reaction time are set, a first flocculant is prepared, a reaction flocculation step is performed on the sample to be treated based on the first reaction reagent, the first pH adjustment index, the first reaction time, and the first flocculant to obtain a flocculation reaction sample;

[0020] The flocculation reaction sample is subjected to a sedimentation treatment to obtain a sedimentation product; and the sedimentation product is subjected to a reflux re-treatment according to the reflux calculation formula and the reflux cycle to obtain the defluorinated sample.

[0021] As an improved scheme, the reaction flocculation step comprises a step one and a step two.

[0022] The step one comprises adjusting the pH value of the sample to be treated to the first pH adjustment index in a pH adjustment tank by using the first reaction reagent to obtain a sample to be reacted.

[0023] The second step includes: introducing the sample to be reacted into a chemical reaction tank, adding calcium chloride into the sample to be reacted in the chemical reaction tank, and reacting for a chemical reaction time being the first reaction time to obtain a sample to be flocculated; introducing the sample to be flocculated into a flocculation tank, and using the first flocculant to perform flocculation treatment on the sample to be flocculated in the flocculation tank to obtain the flocculation reaction sample.

[0024] As an improved solution, the reflux cycle includes: a plurality of reflux time periods and a plurality of sludge discharge time periods.

[0025] The reflux reprocessing includes:

[0026] Introducing the flocculation reaction sample into a sedimentation tank for sedimentation to obtain a sedimentation product;

[0027] Obtaining sample information to be processed, setting reflux parameters, calculating a reflux flow value based on the reflux calculation formula, the sample information to be processed, and the reflux parameters;

[0028] Setting a sludge discharge percentage, and performing a step of discharging sludge between refluxes in the reflux cycle based on the reflux parameters, the reflux flow value, and the sludge discharge percentage.

[0029] After performing the step of discharging sludge between refluxes, performing solid-liquid separation on the sedimentation product in the sedimentation tank to obtain sedimentation product water, and extracting the sedimentation product water as the defluorination sample.

[0030] The step of discharging sludge between refluxes includes:

[0031] In a plurality of sludge discharge time periods in the reflux cycle, the sedimentation product corresponding to the sludge discharge percentage in the sedimentation tank is extracted; in a plurality of reflux time periods in the reflux cycle, the sedimentation product in the sedimentation tank is refluxed to the chemical reaction tank according to the reflux parameters and the reflux flow value, and returns to the second step.

[0032] As an improved solution, the sample information to be processed includes: a sample amount and a sludge concentration in the sample.

[0033] The reflux parameters include: a reflux sludge amount and a reflux sludge concentration.

[0034] The reflux calculation formula is: the reflux flow value is equal to the quotient of a first product and a second product; the first product is the product of the reflux sludge amount and the reflux sludge concentration; and the second product is the product of the sample amount and the sludge concentration in the sample.

[0035] As an improved scheme, the fluorine removal method based on the efficient flocculation and precipitation treatment further comprises:

[0036] The second fluorine-containing index value and the third fluorine-containing index value are set;

[0037] The second fluorine content of the fluorine removal sample is determined;

[0038] The fluorine removal mode is identified;

[0039] If the fluorine removal mode is the first mode, it is determined whether the second fluorine content is not greater than the second fluorine-containing index value, and if the second fluorine content is not greater than the second fluorine-containing index value, the fluorine removal sample is extracted as a fluorine removal finished product;

[0040] If the fluorine removal mode is the second mode, it is determined whether the second fluorine content is not greater than the third fluorine-containing index value, and if the second fluorine content is not greater than the third fluorine-containing index value, the fluorine removal sample is extracted as the fluorine removal finished product.

[0041] As an improved scheme, the first fluorine-containing index value is 100 mg / l;

[0042] The second fluorine-containing index value includes any value in 8-10 mg / l;

[0043] The third fluorine-containing index value includes any value in 40-50 mg / l;

[0044] The error threshold is 0.1-0.5 mg / l.

[0045] The application further provides a fluorine removal system based on a backflow flocculation and precipitation treatment, comprising:

[0046] A fluorine removal mode setting module is configured to set a first fluorine-containing index value and an error threshold, determine a first fluorine content of a sample to be treated, and set a fluorine removal mode based on the first fluorine-containing index value, the error threshold, and the first fluorine content;

[0047] A flocculation and precipitation treatment module is configured to prepare a first reaction reagent and a second reaction reagent, set a backflow calculation formula and a backflow cycle, and perform backflow flocculation and precipitation treatment on the sample to be treated based on the fluorine removal mode, the first reaction reagent, the second reaction reagent, the backflow calculation formula, and the backflow cycle to obtain a fluorine removal sample.

[0048] The application has the following beneficial effects:

[0049] 1. The defluorination method based on reflux flocculation sedimentation treatment can realize improvement on the flocculation sedimentation process through reflux treatment, and the accurate and appropriate reflux flow value is calculated through the self-designed reflux flow calculation formula, and the reflux re-reaction treatment of flocculation sedimentation is carried out according to the reflux flow value, and in the reflux period, the flocculation sedimentation nucleus is continuously enlarged through this principle, and in the process of reflux treatment, the quality of flocculation sedimentation is further improved by cooperating with intermittent sludge discharge, finally, the moisture content of the product in the sedimentation tank is improved, the concentration of suspended particles in the defluorinated water sample is reduced, the surface hydraulic load value of the sedimentation container is improved, and then the construction cost is reduced, the defluorination cost is reduced, and the application and cost performance are very high, and the defects of the prior art are compensated.

[0050] 2. The defluorination system based on reflux flocculation sedimentation treatment can realize the defluorination method based on reflux flocculation sedimentation treatment through the cooperation of the defluorination mode setting module and the flocculation sedimentation treatment module, and then realize the improvement on the flocculation sedimentation process through reflux treatment, finally, the moisture content of the product in the sedimentation tank is improved, the concentration of suspended particles in the defluorinated water sample is reduced, the surface hydraulic load value of the sedimentation container is improved, and then the construction cost is reduced, the defluorination cost is reduced, and the application and cost performance are very high, and the defects of the prior art are compensated. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0052] Figure 1 is a flow chart of the defluorination method based on reflux flocculation sedimentation treatment according to the embodiment 1 of the present application;

[0053] Figure 2 is a specific flow chart of the defluorination method based on reflux flocculation sedimentation treatment according to the embodiment 1 of the present application;

[0054] Figure 3 is an architecture diagram of the defluorination system based on reflux flocculation sedimentation treatment according to the embodiment 2 of the present application. DETAILED DESCRIPTION

[0055] The preferred embodiments of the present application will be described in detail below with reference to the drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application can be more clearly and definitely defined.

[0056] In the description of the present application, it should be noted that the embodiments described in the present application are part of the embodiments of the present application, not all embodiments; based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present application.

[0057] In the description of the present application, it should be noted that the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0058] In the description of the present application, it should be noted that unless otherwise expressly specified and limited, the terms "fluorine-containing index value", "error threshold", "fluorine removal mode", "backflow calculation formula", "backflow period", "backflow flocculation and sedimentation treatment", "primary mode", "secondary mode", "pH adjustment index", "pH adjustment tank", "chemical reaction tank", "flocculation tank", "sedimentation tank", "sedimentation product", "sample amount", "sludge concentration in sample", "backflow sludge amount", "backflow sludge concentration", "fluorine removal mode setting module", "flocculation and sedimentation treatment module" should be broadly understood. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] Embodiment 1

[0060] The present embodiment provides a fluorine removal method based on backflow flocculation and sedimentation treatment, as shown in Figure 1 and Figure 2 The method comprises the following steps:

[0061] S100, a fluorine removal mode setting step, specifically comprising:

[0062] S110, setting a first fluorine-containing index value and an error threshold; determining the first fluorine content of the sample to be treated; setting a fluorine removal mode based on the first fluorine-containing index value, the error threshold and the first fluorine content;

[0063] Specifically, the fluorine removal mode includes a primary mode and a secondary mode; in the present embodiment, step S100 is mainly used to select the corresponding fluorine removal mode according to the fluorine content in the sample to be treated, so as to adapt to different industry demands; specifically, in the present embodiment, the first fluorine-containing index value is 100 mg / l; the error threshold is 0.1~0.5 mg / l; the error threshold is used to further accurately judge whether the fluorine content meets the fluorine-containing index value; in the present embodiment, the sample to be treated is raw water;

[0064] Specifically, the step of setting a fluorine removal mode based on the first fluorine-containing index value, the error threshold and the first fluorine content further comprises:

[0065] determining whether the first fluorine content is not greater than the first fluorine content index value;

[0066] If yes, it indicates that the fluorine content of the sample to be treated is not greater than 100 mg / l, so that primary fluorine removal can be performed, and the fluorine removal mode is set to the primary mode.

[0067] If no, it indicates that the fluorine content of the sample to be treated is greater than 100 mg / l, for example, the fluorine content of the related sample to be treated in the photovoltaic industry is generally above 500 mg / l, so that the difference between the first fluorine content and the first fluorine content index value is calculated, and it is determined whether the difference is not greater than the error threshold value; if the difference is not greater than the error threshold value, it indicates that the first fluorine content is between 100.1 mg / l and 100.5 mg / l, and it is still determined to perform primary fluorine removal, so that the fluorine removal mode is set to the primary mode; if the difference is greater than the error threshold value, it indicates that the first fluorine content exceeds 100.1 mg / l to 100.5 mg / l, so that secondary fluorine removal needs to be performed, and the fluorine removal mode is set to the secondary mode.

[0068] S200, a flocculation and sedimentation treatment step, specifically comprising:

[0069] S210, preparing a first reaction reagent and a second reaction reagent; setting a reflux calculation formula and a reflux cycle; performing reflux flocculation and sedimentation treatment on the sample to be treated based on the fluorine removal mode, the first reaction reagent, the second reaction reagent, the reflux calculation formula and the reflux cycle to obtain a fluorine removal sample; in this embodiment, the principles of the primary mode and the secondary mode are both reflux flocculation and sedimentation treatment, the fluorine removal process under the secondary mode needs to perform two times of reflux flocculation and sedimentation treatment, and the corresponding reaction reagents also change, and compared, the fluorine removal strength of the secondary mode is greater than that of the primary mode.

[0070] Specifically, the step of performing reflux flocculation and sedimentation treatment on the sample to be treated based on the fluorine removal mode, the first reaction reagent, the second reaction reagent, the reflux calculation formula and the reflux cycle to obtain a fluorine removal sample further comprises: if the fluorine removal mode is the primary mode, performing the reflux flocculation and sedimentation treatment on the sample to be treated based on the first reaction reagent, the reflux calculation formula and the reflux cycle to obtain the fluorine removal sample; if the fluorine removal mode is the secondary mode, first performing the reflux flocculation and sedimentation treatment on the sample to be treated based on the first reaction reagent, the reflux calculation formula and the reflux cycle to obtain a primary fluorine removal product; then performing the reflux flocculation and sedimentation treatment on the primary fluorine removal product again based on the second reaction reagent, the reflux calculation formula and the reflux cycle to obtain a secondary fluorine removal product; setting the finally obtained secondary fluorine removal product as the fluorine removal sample.

[0071] Specifically, in the embodiment, the flow of the reflux flocculation sedimentation treatment performed on the primary fluorine removal product is consistent with the flow of the reflux flocculation sedimentation treatment performed on the sample to be treated, only the reaction reagents are different; in the embodiment, the first reaction reagent is an alkaline pH adjusting reagent, and the second reaction reagent includes an alkaline pH adjusting reagent and a high-efficiency fluorine removal agent;

[0072] Specifically, the reflux flocculation sedimentation treatment based on the first reaction reagent includes:

[0073] A first pH adjusting index and a first reaction time are set, a first flocculant is prepared, and a reaction flocculation step is performed on the sample to be treated based on the first reaction reagent, the first pH adjusting index, the first reaction time, and the first flocculant to obtain a flocculation reaction sample; in the embodiment, the first pH adjusting index is the pH value that the sample to be treated needs to reach after pH adjustment; the first reaction time is set to 3 minutes; the flocculation reaction sample is subjected to a sedimentation treatment to obtain a sedimentation product; and the sedimentation product is subjected to reflux reprocessing according to the reflux calculation formula and the reflux cycle to obtain the fluorine removal sample.

[0074] Specifically, the reaction flocculation step includes steps one and two performed in sequence.

[0075] Specifically, the step one includes adjusting the pH value of the sample to be treated to the first pH adjusting index by using the first reaction reagent in a pH adjusting tank to obtain a sample to be reacted; first, in the embodiment, the pH value of the fluorine-containing sample to be treated is usually too acidic, so it needs to be neutralized and adjusted before orderly proceeding to the subsequent steps; the sample to be reacted is the sample to be treated whose pH value reaches the first pH adjusting index.

[0076] Specifically, the step two includes: first, introducing the sample to be reacted into a chemical reaction tank, adding calcium chloride (CaCl2) to the sample to be reacted in the chemical reaction tank, and performing a chemical reaction with a reaction time of the first reaction time to obtain a sample to be flocculated; then introducing the obtained sample to be flocculated into a flocculation tank, and using the first flocculant to perform a flocculation treatment on the sample to be flocculated in the flocculation tank to obtain the flocculation reaction sample; correspondingly, the first flocculant is an inorganic polymer flocculant, the chemical reaction is a mutual reaction between compounds, and the flocculation treatment is a flocculation reaction between the first flocculant and the sample to be flocculated.

[0077] Specifically, in the backflow flocculation precipitation treatment based on the second reaction reagent, in the step one, the pH value of the sample to be treated is adjusted to the first pH adjustment index by using the alkaline pH adjustment reagent in the second reaction reagent in the pH adjustment tank to obtain a sample to be reacted; in the step two, the sample to be reacted is first introduced into a chemical reaction tank, and calcium chloride (CaCl2) in the second reaction reagent is added into the sample to be reacted in the chemical reaction tank to perform a chemical reaction for the first reaction time, and then a high-efficiency fluoride removal agent in the second reaction reagent is added into the sample to be reacted in the chemical reaction tank to perform a chemical reaction, thereby obtaining a sample to be flocculated; and then the obtained sample to be flocculated is introduced into a flocculation tank, and the first flocculant is used to perform flocculation treatment on the sample to be flocculated in the flocculation tank, thereby obtaining the flocculation reaction sample.

[0078] Specifically, the backflow cycle includes a plurality of backflow time periods and a plurality of sludge discharge time periods; in this embodiment, the plurality of backflow time periods and the plurality of sludge discharge time periods are independent and connected with each other; for example, taking time periods as an example, the plurality of backflow time periods include 7:00~7:10, 7:20~7:30, and 7:40~7:50; and the plurality of sludge discharge time periods include 7:11~7:19, 7:31~7:39, and 7:51~7:59.

[0079] Specifically, the backflow reprocessing includes:

[0080] The flocculation reaction sample is introduced into a precipitation tank for precipitation to obtain a precipitation product; in this embodiment, the precipitation tank is a high-efficiency precipitation tank, and the surface hydraulic load design value of the high-efficiency precipitation tank is 4; compared with the surface hydraulic load design value 1 of a traditional precipitation tank, the diameter of the high-efficiency precipitation tank used in this method is only half of that of the traditional precipitation tank, which greatly reduces the construction cost and the use cost.

[0081] The information of the sample to be treated is obtained, the backflow parameters are set, and the backflow flow value is calculated based on the backflow calculation formula, the information of the sample to be treated, and the backflow parameters; in this embodiment, the information of the sample to be treated is the related concentration and content information of raw water, and the backflow parameters are the related concentration and content information of backflow precipitation; specifically, the information of the sample to be treated includes the sample amount and the sludge concentration in the sample; and the backflow parameters include the backflow sludge amount and the backflow sludge concentration; in this embodiment, the units of the sample amount and the sludge concentration in the sample are m 3 / h, and the units of the backflow sludge amount and the backflow sludge concentration are g / m 3 .

[0082] Specifically, the backflow calculation formula is that the backflow flow value is equal to the quotient of the first product and the second product; the first product is the product of the backflow sludge amount and the backflow sludge concentration; the second product is the product of the sample amount and the sludge concentration in the sample; specifically, if the sample amount is Q1, the sludge concentration in the sample is C1, the backflow sludge amount is Q2, the backflow sludge concentration is C2, and the backflow flow value is R, the backflow calculation formula is R = (Q2 * C2) / (Q1 * C1); correspondingly, the unit of the calculated backflow flow value is g / h;

[0083] Further, a sludge discharge percentage is set, and a backflow interval discharge step is performed in the backflow period based on the backflow parameter, the backflow flow value, and the sludge discharge percentage; in this embodiment, the sludge discharge percentage is set to 1%; the principle of the backflow interval discharge step is that the flocculation, sedimentation, and intermittent sludge discharge are performed in cycles according to the backflow period and the calculated related parameters; after the backflow interval discharge step is performed, the solid-liquid separation is performed on the sediment product in the sediment tank to obtain sediment product water, and the sediment product water is extracted as the defluorination sample; the defluorination sample is the final sediment product water, which is the sample after defluorination.

[0084] Specifically, the backflow interval discharge step includes: in a plurality of sludge discharge time periods in the backflow period, the sediment product corresponding to the sludge discharge percentage in the sediment tank is extracted and discharged, that is, 1% of the sludge in the sediment tank is extracted and discharged from the sediment tank; in a plurality of backflow time periods in the backflow period, the sediment product in the sediment tank is backflowed into the chemical reaction tank according to the backflow parameter and the backflow flow value, that is, the sediment product in the sediment tank is backflowed into the chemical reaction tank according to the backflow flow value, and the sediment product backflowed into the chemical reaction tank continues to the related reaction step in the step two, thereby realizing continuous cycle flocculation until the end of the backflow period, completing flocculation and enabling the solid-liquid separation.

[0085] Specifically, the defluorination method based on efficient flocculation and sedimentation treatment further includes: determination of the fluorine content of the defluorination sample after defluorination, for judging whether the defluorination sample after defluorination meets the defluorination requirement.

[0086] Specifically, a second fluorine content index value and a third fluorine content index value are set; specifically, the second fluorine content index value includes any value in the range of 8-10 mg / l, that is, the second fluorine content index value is any value in an index interval, which is adaptively selected according to different application scenarios of the method, that is, in the range of 8-10 mg / l; the third fluorine content index value includes any value in the range of 40-50 mg / l, that is, the third fluorine content index value is any value in an index interval, which is also adaptively selected according to different application scenarios of the method, that is, in the range of 40-50 mg / l.

[0087] measuring a second fluorine content of the defluorinated sample; the second fluorine content is a fluorine content of the defluorinated sample obtained at present; identifying a defluorination mode adopted by the defluorinated sample;

[0088] If the defluorination mode is the first mode, it is only necessary to determine whether the second fluorine content is not greater than the second fluorine index value; if the second fluorine content is not greater than the second fluorine index value, it indicates that the defluorinated sample meets the defluorination requirement, and the defluorinated sample is extracted as a defluorination finished product;

[0089] If the defluorination mode is the second mode, it is necessary to determine whether the second fluorine content is not greater than the third fluorine index value; if the second fluorine content is not greater than the third fluorine index value, it indicates that the defluorinated sample meets the defluorination requirement, and the defluorinated sample is extracted as the defluorination finished product.

[0090] Embodiment 2

[0091] This embodiment is based on the same inventive concept as the defluorination method based on reflux flocculation sedimentation treatment described in Embodiment 1, and provides a defluorination system based on reflux flocculation sedimentation treatment, as shown in Figure 3 The defluorination system based on reflux flocculation sedimentation treatment comprises:

[0092] a defluorination mode setting module, configured to set a first fluorine index value and an error threshold value; measure a first fluorine content of a sample to be treated; and set a defluorination mode based on the first fluorine index value, the error threshold value and the first fluorine content;

[0093] Specifically, the defluorination mode comprises a first mode and a second mode.

[0094] Specifically, the operation of setting the defluorination mode by the defluorination mode setting module based on the first fluorine index value, the error threshold value and the first fluorine content further comprises: the defluorination mode setting module determines whether the first fluorine content is not greater than the first fluorine index value; if yes, the defluorination mode setting module sets the defluorination mode as the first mode; if no, the defluorination mode setting module calculates a difference value between the first fluorine content and the first fluorine index value, and determines whether the difference value is not greater than the error threshold value; if the difference value is not greater than the error threshold value, the defluorination mode setting module sets the defluorination mode as the first mode; if the difference value is greater than the error threshold value, the defluorination mode setting module sets the defluorination mode as the second mode.

[0095] a flocculation and precipitation treatment module configured to prepare the first reaction reagent and the second reaction reagent, set a reflux calculation formula and a reflux cycle, and perform a reflux flocculation and precipitation treatment on the sample to be treated based on the defluorination mode, the first reaction reagent, the second reaction reagent, the reflux calculation formula and the reflux cycle, to obtain a defluorination sample;

[0096] Specifically, the operation of the flocculation and precipitation treatment module performing the reflux flocculation and precipitation treatment on the sample to be treated based on the defluorination mode, the first reaction reagent, the second reaction reagent, the reflux calculation formula and the reflux cycle to obtain a defluorination sample further includes: if the defluorination mode is the primary mode, the flocculation and precipitation treatment module performs the reflux flocculation and precipitation treatment on the sample to be treated based on the first reaction reagent, the reflux calculation formula and the reflux cycle to obtain the defluorination sample; if the defluorination mode is the secondary mode, the flocculation and precipitation treatment module first performs the reflux flocculation and precipitation treatment on the sample to be treated based on the first reaction reagent, the reflux calculation formula and the reflux cycle to obtain a primary defluorination product; then the flocculation and precipitation treatment module performs the reflux flocculation and precipitation treatment on the primary defluorination product based on the second reaction reagent, the reflux calculation formula and the reflux cycle to obtain a secondary defluorination product; and the flocculation and precipitation treatment module sets the secondary defluorination product as the defluorination sample.

[0097] Specifically, the reflux flocculation and precipitation treatment of the flocculation and precipitation treatment module based on the first reaction reagent includes: the flocculation and precipitation treatment module sets a first pH adjustment index and a first reaction time, prepares a first flocculant, performs a reaction flocculation step on the sample to be treated based on the first reaction reagent, the first pH adjustment index, the first reaction time and the first flocculant to obtain a flocculation reaction sample, performs a precipitation treatment on the flocculation reaction sample to obtain a precipitation product, and performs a reflux re-treatment on the precipitation product according to the reflux calculation formula and the reflux cycle to obtain the defluorination sample.

[0098] Specifically, the reaction flocculation step includes: step one and step two.

[0099] Specifically, the step one includes: in a pH adjustment tank, the flocculation and precipitation treatment module adjusts the pH value of the sample to be treated to the first pH adjustment index using the first reaction reagent to obtain a sample to be reacted.

[0100] Specifically, the step two includes: the flocculation and sedimentation treatment module introduces the sample to be reacted into a chemical reaction tank, and adds calcium chloride into the sample to be reacted in the chemical reaction tank to perform a chemical reaction for a reaction time being the first reaction time, to obtain a sample to be flocculated; the flocculation and sedimentation treatment module introduces the sample to be flocculated into a flocculation tank, and uses the first flocculant to perform flocculation treatment on the sample to be flocculated in the flocculation tank, to obtain the flocculation reaction sample.

[0101] Specifically, the backflow cycle includes: a plurality of backflow time periods and a plurality of sludge discharge time periods.

[0102] Specifically, the backflow reprocessing includes: the flocculation and sedimentation treatment module introduces the flocculation reaction sample into a sedimentation tank to perform sedimentation, to obtain a sedimentation product; the flocculation and sedimentation treatment module acquires sample information to be processed, sets backflow parameters, and calculates a backflow flow value based on the backflow calculation formula, the sample information to be processed, and the backflow parameters; the flocculation and sedimentation treatment module sets a sludge discharge percentage, and performs a backflow and discharge step in the backflow cycle based on the backflow flow value and the sludge discharge percentage; after the backflow and discharge step is performed, the flocculation and sedimentation treatment module performs solid-liquid separation on the sedimentation product in the sedimentation tank, to obtain a sedimentation product water, and extracts the sedimentation product water as the defluorination sample.

[0103] Specifically, the backflow and discharge step includes: the flocculation and sedimentation treatment module extracts the sedimentation product corresponding to the sludge discharge percentage in the sedimentation tank in a plurality of sludge discharge time periods in the backflow cycle; and the flocculation and sedimentation treatment module backflows the sedimentation product in the sedimentation tank to the chemical reaction tank according to the backflow flow value in a plurality of backflow time periods in the backflow cycle, and returns to the step two.

[0104] Specifically, the defluorination system based on the high-efficiency flocculation and sedimentation treatment further includes: a backup detection module; the backup detection module is configured to set a second fluorine content index value and a third fluorine content index value, measure a second fluorine content of the defluorination sample, identify the defluorination mode, determine whether the second fluorine content is not greater than the second fluorine content index value if the defluorination mode is the first-level mode, extract the defluorination sample as a defluorination finished product if the second fluorine content is not greater than the second fluorine content index value, determine whether the second fluorine content is not greater than the third fluorine content index value if the defluorination mode is the second-level mode, and extract the defluorination sample as the defluorination finished product if the second fluorine content is not greater than the third fluorine content index value.

[0105] In the embodiment, the defluorination mode setting module, the flocculation and sedimentation treatment module and the backup detection module in the defluorination system based on the efficient flocculation and sedimentation treatment are respectively intelligent modules composed of a plurality of electric control adjusting tanks, electric control reaction tanks, electric control flocculation and sedimentation tanks, related industrial control host devices and manual operation devices.

[0106] Different from the prior art, the defluorination method and system based on the backflow flocculation and sedimentation treatment can improve the flocculation and sedimentation process through the backflow treatment, and calculate an accurate and suitable backflow flow value through the self-designed backflow flow calculation formula, so that the flocculation and sedimentation backflow and reaction treatment are performed according to the backflow flow value. Through the principle, the flocculation and sedimentation nucleus is continuously enlarged in the backflow period. In the backflow treatment process, the intermittent sludge discharge is also matched to further improve the flocculation and sedimentation quality. Finally, the moisture content of the product in the sedimentation tank is improved, the suspended particle concentration in the defluorination water sample is reduced, the surface hydraulic load value of the sedimentation container is improved, the construction cost is reduced, the defluorination cost is reduced, the application and cost performance of the application are very high, and the deficiencies of the prior art are made up.

[0107] The above-mentioned embodiment serial numbers of the application only serve for description, and do not represent the advantages and disadvantages of the embodiments.

[0108] The above-mentioned embodiments of the application are only examples, and do not limit the patent scope of the application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, which is based on the content of the specification and drawings of the application, is also included in the patent protection scope of the application.

Claims

1. A defluorination method based on a backflow flocculation sedimentation treatment, characterized by, The method comprises the following steps: a fluorine removal mode setting step; a first fluorine content index value and an error threshold value are set; a first fluorine content of a sample to be treated is measured; a fluorine removal mode is set based on the first fluorine content index value, the error threshold value and the first fluorine content; the fluorine removal mode comprises a primary mode and a secondary mode; the step of setting the fluorine removal mode based on the first fluorine content index value, the error threshold value and the first fluorine content further comprises: determining whether the first fluorine content is not greater than the first fluorine content index value; if yes, setting the fluorine removal mode as the primary mode; if no, calculating a difference value between the first fluorine content and the first fluorine content index value, determining whether the difference value is not greater than the error threshold value; if the difference value is not greater than the error threshold value, setting the fluorine removal mode as the primary mode; if the difference value is greater than the error threshold value, setting the fluorine removal mode as the secondary mode; a flocculation and sedimentation treatment step; a first reaction reagent and a second reaction reagent are prepared; a reflux calculation formula and a reflux cycle are set; a reflux flocculation and sedimentation treatment is performed on the sample to be treated based on the fluorine removal mode, the first reaction reagent, the second reaction reagent, the reflux calculation formula and the reflux cycle, to obtain a fluorine removal sample.

2. The method according to claim 1, wherein: the step of performing the reflux flocculation and sedimentation treatment on the sample to be treated based on the fluorine removal mode, the first reaction reagent, the second reaction reagent, the reflux calculation formula and the reflux cycle to obtain a fluorine removal sample further comprises: if the fluorine removal mode is the primary mode, performing the reflux flocculation and sedimentation treatment on the sample to be treated based on the first reaction reagent, the reflux calculation formula and the reflux cycle to obtain the fluorine removal sample; if the fluorine removal mode is the secondary mode, first performing the reflux flocculation and sedimentation treatment on the sample to be treated based on the first reaction reagent, the reflux calculation formula and the reflux cycle to obtain a primary fluorine removal product; then performing the reflux flocculation and sedimentation treatment on the primary fluorine removal product based on the second reaction reagent, the reflux calculation formula and the reflux cycle to obtain a secondary fluorine removal product; setting the secondary fluorine removal product as the fluorine removal sample.

3. The method according to claim 2, wherein: the reflux flocculation and sedimentation treatment based on the first reaction reagent comprises: a first pH adjustment index and a first reaction time are set, a first flocculant is prepared, a reaction flocculation step is performed on the sample to be treated based on the first reaction reagent, the first pH adjustment index, the first reaction time and the first flocculant to obtain a flocculation reaction sample; a sedimentation treatment is performed on the flocculation reaction sample to obtain a sedimentation product; the sedimentation product is re-treated by reflux according to the reflux calculation formula and the reflux cycle to obtain the fluorine removal sample.

4. The method according to claim 3, wherein: The reaction flocculation step comprises: step one and step two; The step one comprises: adjusting the pH value of the sample to be treated to the first pH adjustment index by using the first reaction reagent in the pH adjustment tank to obtain a sample to be reacted; The step two comprises: introducing the sample to be reacted into the chemical reaction tank, adding calcium chloride into the sample to be reacted in the chemical reaction tank, and performing chemical reaction for a first reaction time to obtain a sample to be flocculated; introducing the sample to be flocculated into the flocculation tank, and performing flocculation treatment on the sample to be flocculated in the flocculation tank by using the first flocculant to obtain the flocculation reaction sample.

5. The defluorination method based on the backflow flocculation and sedimentation treatment according to claim 4, wherein: The backflow cycle comprises: a plurality of backflow time periods and a plurality of sludge discharge time periods; The backflow reprocessing comprises: introducing the flocculation reaction sample into the sedimentation tank for sedimentation to obtain a sedimentation product; obtaining sample information, setting backflow parameters, calculating a backflow flow value based on the backflow calculation formula, the sample information and the backflow parameters; setting a sludge discharge percentage, and performing a backflow and discharge step based on the backflow flow value and the sludge discharge percentage; after performing the backflow and discharge step, performing solid-liquid separation on the sedimentation product in the sedimentation tank to obtain a sedimentation product water, and extracting the sedimentation product water as the defluorination sample; The backflow and discharge step comprises: in a plurality of sludge discharge time periods in the backflow cycle, discharging the sedimentation product corresponding to the sludge discharge percentage in the sedimentation tank; and in a plurality of backflow time periods in the backflow cycle, backflowing the sedimentation product in the sedimentation tank to the chemical reaction tank according to the backflow flow value, and returning to the step two.

6. The defluorination method based on the backflow flocculation and sedimentation treatment according to claim 5, wherein: The sample information comprises: a sample amount and a sludge concentration in the sample; The backflow parameters comprise: a backflow sludge amount and a backflow sludge concentration; The backflow calculation formula is: the backflow flow value is equal to the quotient of a first product and a second product; the first product is the product of the backflow sludge amount and the backflow sludge concentration; and the second product is the product of the sample amount and the sludge concentration in the sample.

7. The defluorination method based on the backflow flocculation and sedimentation treatment according to claim 6, wherein: The defluorination method based on the high-efficiency flocculation and sedimentation treatment further comprises: setting a second fluorine content index value and a third fluorine content index value; measuring a second fluorine content of the defluorination sample; identifying the defluorination mode; if the defluorination mode is the first mode, determining whether the second fluorine content is not greater than the second fluorine content index value, and if the second fluorine content is not greater than the second fluorine content index value, extracting the defluorination sample as a defluorination finished product. If the defluorination mode is the secondary mode, it is determined whether the second fluorine content is not greater than the third fluorine content index value, and if the second fluorine content is not greater than the third fluorine content index value, the defluorination sample is extracted as the defluorination finished product.

8. The defluorination method based on reflux flocculation and sedimentation treatment according to claim 7, characterized in that: the first fluorine content index value is 100 mg / l; the second fluorine content index value includes any value in 8-10 mg / l; the third fluorine content index value includes any value in 40-50 mg / l; the error threshold is 0.1-0.5 mg / l.

9. A defluorination system based on the defluorination method by backflow flocculation sedimentation treatment according to any one of claims 1 to 8, characterized by, including: a defluorination mode setting module for setting a first fluorine content index value and an error threshold; determining a first fluorine content of a sample to be treated; setting a defluorination mode based on the first fluorine content index value, the error threshold and the first fluorine content; a flocculation and sedimentation treatment module for preparing a first reaction reagent and a second reaction reagent; setting a reflux calculation formula and a reflux cycle; performing a reflux flocculation and sedimentation treatment on the sample to be treated based on the defluorination mode, the first reaction reagent, the second reaction reagent, the reflux calculation formula and the reflux cycle to obtain a defluorination sample.

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