A method for removing fluoride ions from organic wastewater by electrocoagulation and catalyst coupling

Abstract

The invention discloses a method for removing fluoride ions in organic wastewater by coupling an electric flocculation catalyst, belonging to the technical field of wastewater treatment. The method comprises S1, flocculant preparation: S1-1 preparation of a reagent A and S1-2 preparation of a reagent B; S2, fluorine-containing wastewater treatment: mixing the reagent A and the reagent B in a wastewater electrochemical treatment device; S3, precipitate separation: separating a supernatant and a precipitate obtained after the treatment; firstly combining the reagent B with the fluoride-containing wastewater, so that the fluoride ions in the fluoride-containing wastewater and the metal ions in the reagent B form a precipitate, and then forming floccules by using the reagent A, wherein the reagent B improves the combining efficiency of the fluoride ions and the metal ions in the fluoride-containing wastewater, and the reagent A improves the sedimentation efficiency of the precipitate. The removal method of the invention has high removal efficiency and good removal effect for fluoride ions in the fluoride-containing wastewater.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a method for removing fluoride ions in organic wastewater by coupling an electric flocculation catalyst. Background Art

[0002] Fluorine-containing organic wastewater refers to wastewater containing fluoride and organic matter. This wastewater usually comes from industrial fields such as chemical, metallurgy, pharmaceutical, pesticide, plastic, electronics, as well as some domestic wastewater.

[0003] These industrial processes often require the use of fluorinated organic compounds as raw materials or catalysts. The production of these organic compounds generates wastewater containing large amounts of fluoride and organic compounds. If not properly treated, this wastewater can cause serious harm to the environment and human health.

[0004] Treatment methods for fluorinated organic wastewater include physical, chemical, and biological methods. Common chemical methods include fluoride reduction, oxidation, precipitation, and adsorption, while biological methods utilize microorganisms to degrade and remove organic matter from wastewater. In practice, it is often necessary to select the appropriate treatment method based on the wastewater's characteristics and treatment requirements to achieve effective wastewater treatment and resource recovery.

[0005] Electrochemical method is a commonly used technology for treating fluoride-containing wastewater. Its basic principle is to use electrochemical reaction to convert fluoride ions in wastewater into harmless substances, thereby achieving the purpose of removing fluoride ions. Flocculation is a common wastewater treatment method. Its basic principle is to use chemical reaction or physical action to aggregate suspended particles or colloidal particles in wastewater to form larger precipitation particles. Existing methods for removing fluoride ions from fluoride-containing wastewater have low efficiency and poor effect. How to combine electrochemical method and flocculation method to improve the efficiency of fluoride ion removal in fluoride-containing organic wastewater and enhance the fluoride ion removal effect has become a difficulty. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a method for removing fluoride ions in organic wastewater by coupling electrocoagulation with a catalyst.

[0007] The technical solution of the present invention is: a method for removing fluoride ions in organic wastewater by coupling electrocoagulation and catalyst, comprising the following steps:

[0008] S1. Preparation of flocculant:

[0009] S1-1 Preparation of Reagent A:

[0010] 10-15 parts of sodium dodecylbenzenesulfonate, 7-10 parts of acrylamide polymer, 5-11 parts of a chelating agent, 7-11 parts of methyl methacrylate, 5-11 parts of polyvinyl acetate, and 4-7 parts of citric acid are placed in a mixer and mixed to obtain a mixed powder. Water is added to the mixer in a mass ratio of water to the mixed powder of 1:2. The mixing process is accompanied by heating. After the water is evaporated, reagent A is obtained;

[0011] Preparation of S1-2 Reagent B:

[0012] 5-8 parts of aluminum sulfate, 10-15 parts of ferric chloride, 10-15 parts of activated carbon, 4-5 parts of a cross-linking agent, and 3-7 parts of plant starch are placed in a mixer and mixed by adding water, wherein the mass of the water accounts for 20-30% of the total mass of the materials in the mixer. After the mixing is completed, the mixture is dried, and after drying, the mixture is ground to obtain reagent B.

[0013] S2. Treatment of fluoride-containing wastewater:

[0014] The wastewater is passed into a wastewater electrochemical treatment device, and the reagent B obtained in step S1-2 is first poured into the wastewater electrochemical treatment device, the amount of the reagent B added is 1-2 g / L, the wastewater is stirred by the wastewater electrochemical treatment device, and stirred for 20-40 minutes. At the same time, the anode plate and the cathode plate of the wastewater electrochemical treatment device are energized to electrochemically treat the wastewater. After the stirring is completed, the reagent A is added and the stirring is continued for 10-20 minutes. The amount of the reagent A added is 2-3 g / L. The stirring process after the addition of the reagent A is accompanied by ultrasonic vibration. After the stirring is completed, the wastewater is allowed to stand for 5-10 minutes.

[0015] S3: Separation of precipitate:

[0016] The supernatant is pumped out of the device through the wastewater electrochemical treatment device, and the sediment at the bottom of the device is discharged through the bottom of the wastewater electrochemical treatment device.

[0017] Furthermore, the mixer speed in S1-1 is 120-150 r / min, the mixing time is 10-25 min, and the heating temperature during the mixing process is 100-110°C.

[0018] Description: By mixing liquid and solid substances at high temperature in a mixer, the liquid substance can be wrapped around the surface of the solid substance, and then the water is evaporated by heating to form a mixed crystal.

[0019] Furthermore, the mixer speed in S1-2 is 180-200 r / min, the mixing time is 10-20 min, the drying temperature of the drying treatment is 90-110° C., the drying time is 10-15 min, and the particle size of the reagent B after grinding is 80-100 μm.

[0020] Description: Plant starch causes fixed powder substances to agglomerate under high temperature, and forms solid substances through drying, which are then ground into solid powder, which is beneficial to promote the formation of precipitates between fluoride ions and gold ions in fluoride-containing wastewater.

[0021] Furthermore, the chelating agent in S1-1 is composed of the following components in parts by weight: 4-9 parts of calcium aluminum ferric silicate, 0.3-0.5 parts of triethanolamine, 0.5-0.9 parts of sodium lauryl sulfate, and 0.2-0.6 parts of polyacrylamide.

[0022] Description: Chelating agents can form stable complexes with fluoride ions in wastewater. The chemical structure of this complex is usually formed by a central ion surrounded by a coordinating group. Due to the strong coordination ability of chelating agents, they can form very stable complexes with fluoride ions, making it difficult for fluoride ions to be used by other substances or microorganisms, thereby achieving the purpose of removing fluoride ions in wastewater.

[0023] Furthermore, the crosslinking agent in S1-2 is composed of the following components in parts by weight: 2-2.5 parts of polyethyleneimine, 1-1.3 parts of vinyltrimethylammonium chloride, and 1-1.2 parts of dimethylaminoethyl methacrylate.

[0024] Description: The role of the cross-linking agent in the treatment of fluoride-containing wastewater is mainly to form a gel system with high strength and stability through cross-linking, thereby achieving the purpose of removing fluoride ions in the wastewater.

[0025] Furthermore, the anode plate is made of Fe2O3, the cathode plate is made of stainless steel, the working voltage during electrochemical treatment is 2.5-8V, the working current is 20-30mA, and the frequency of ultrasonic vibration is 20-25kHz.

[0026] Note: Anode plate is made of Fe2O3, Fe 3+ ions and F - The ions combine to form FeF3 precipitation, which has a high efficiency in removing fluoride ions.

[0027] Furthermore, the wastewater electrochemical treatment equipment in step S2 includes a treatment chamber, a support frame is provided at the bottom of the treatment chamber, an anode plate and a cathode plate are fixedly connected to the left and right sides of the inner wall of the treatment chamber, an additive port and a water inlet pipe are fixedly connected to the upper left side of the treatment chamber, a decanter is provided above the treatment chamber, and a sewage pipe is provided at the bottom right side of the treatment chamber.

[0028] Description: An electrolytic cell is formed by the anode plate and cathode plate in the treatment chamber. Reagent B contains a large amount of metal ions to form an electrolyte, which then combines with the fluoride ions in the wastewater to form a precipitate, with a high fluoride ion removal efficiency.

[0029] Furthermore, the decanter includes a telescopic tube, the upper end of the telescopic tube is fixedly connected to the top of the processing bin, the lower end side wall of the telescopic tube is horizontally fixedly connected with a plurality of connecting tubes, the connecting tubes are communicated with the inside of the side wall of the telescopic tube, the outer end of the telescopic tube is fixedly connected with a buoyancy ring, the top of the telescopic tube is connected to a water pump, the left and right side walls of the water pump are fixedly connected with a connecting rod, the lower end of the connecting rod is fixedly connected to the top of the processing bin, and the water outlet of the water pump is connected with a water pumping pipe.

[0030] Description: The supernatant is extracted from the treatment chamber through a decanter to separate the sediment from the supernatant.

[0031] Furthermore, a stirring motor is provided at the bottom of the processing bin, and a stirring rod is transmission-connected to the output shaft of the stirring motor, and the stirring rod is rotationally connected to the bottom of the processing bin.

[0032] Note: Stirring the wastewater with a stirring rod is beneficial to the combination of early metal ions and fluoride ions, generating a large amount of precipitation.

[0033] Furthermore, an ultrasonic oscillator for ultrasonically vibrating the wastewater is provided at the bottom of the treatment chamber.

[0034] Description: Ultrasonic vibration is applied to the processing chamber through an ultrasonic vibrator to enhance the sedimentation efficiency of the sediment.

[0035] The beneficial effects of the present invention are:

[0036] (1) The electric flocculation catalyst of the present invention comprises reagent A and reagent B. Reagent B is first combined with fluorine-containing wastewater to form a precipitate with the fluorine ions in the fluorine-containing wastewater and the metal ions in reagent B. Then, floccules are formed by reagent A. Reagent B improves the combination efficiency of fluorine ions and metal ions in the fluorine-containing wastewater, and reagent A improves the sedimentation efficiency of the precipitate. Reagent A can also sediment organic matter in the wastewater. The removal method of the present invention has high removal efficiency and good removal effect for fluorine ions in fluorine-containing wastewater.

[0037] (2) The wastewater electrochemical treatment equipment of the present invention can effectively separate the precipitate and the supernatant, and has not only a stirring function but also an ultrasonic vibration effect. It can electrochemically treat fluorine-containing wastewater and effectively enhance the removal efficiency of fluoride ions in fluorine-containing wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the electrochemical treatment equipment of the present invention.

[0039] Figure 2 It is a top view of the connection relationship between the processing chamber, the anode plate and the cathode plate of the present invention.

[0040] Among them, 1-treatment chamber, 2-support frame, 3-anode plate, 4-cathode plate, 5-additive port, 6-water inlet pipe, 7-decanter, 8-sewage pipe, 71-telescopic pipe, 72-connecting pipe, 73-buoyancy ring, 74-water pump, 75-connecting rod, 76 water pump, 11-stirring motor, 12-stirring rod, 9-ultrasonic oscillator. DETAILED DESCRIPTION

[0041] Example 1:

[0042] A method for removing fluoride ions in organic wastewater by coupling electrocoagulation with a catalyst comprises the following steps:

[0043] S1. Preparation of flocculant:

[0044] S1-1 Preparation of Reagent A:

[0045] 10 parts of sodium dodecylbenzenesulfonate, 7 parts of acrylamide polymer, 5 parts of chelating agent, 7 parts of methyl methacrylate, 5 parts of polyvinyl acetate, and 4 parts of citric acid are placed in a mixer and mixed to obtain a mixed powder. Water is added to the mixer in a mass ratio of water to mixed powder of 1:2. The mixing process is accompanied by heating. After the water is evaporated, reagent A is obtained;

[0046] Preparation of S1-2 Reagent B:

[0047] 5 parts of aluminum sulfate, 10 parts of ferric chloride, 10 parts of activated carbon, 4 parts of a cross-linking agent, and 3 parts of plant starch are placed in a mixer and mixed by adding water. The mass of water accounts for 20% of the total mass of the substances in the mixer. After the mixing is completed, the mixture is dried and ground. After the drying is completed, reagent B is obtained.

[0048] S2. Treatment of fluoride-containing wastewater:

[0049] The wastewater is passed into a wastewater electrochemical treatment device, and the reagent B obtained in step S1-2 is first poured into the wastewater electrochemical treatment device, the amount of the reagent B added is 1 g / L, the wastewater is stirred by the wastewater electrochemical treatment device, and stirred for 20 minutes. At the same time, the anode plate 3 and the cathode plate 4 of the wastewater electrochemical treatment device are energized to electrochemically treat the wastewater. After the stirring is completed, the reagent A is added and the stirring is continued for 10 minutes. The amount of the reagent A added is 2 g / L. The stirring process after the addition of the reagent A is accompanied by ultrasonic vibration. After the stirring is completed, the wastewater is allowed to stand for 5 minutes;

[0050] S3: Separation of precipitate:

[0051] The supernatant is pumped out of the device through the wastewater electrochemical treatment device, and the sediment at the bottom of the device is discharged through the bottom of the wastewater electrochemical treatment device.

[0052] The mixer speed in S1-1 is 120 r / min, the mixing time is 10 min, and the heating temperature during the mixing process is 100°C.

[0053] The speed of the mixer in S1-2 is 180 r / min, the mixing time is 10 min, the drying temperature of the drying treatment is 90° C., the drying time is 10 min, and the particle size of the reagent B after grinding is 80 μm.

[0054] The chelating agent in S1-1 is composed of the following components in parts by weight: 4 parts of calcium aluminum ferric silicate, 0.3 parts of triethanolamine, 0.5 parts of sodium lauryl sulfate, and 0.2 parts of polyacrylamide.

[0055] The crosslinking agent in S1-2 is composed of the following components in parts by weight: 2 parts of polyethyleneimine, 1 part of vinyltrimethylammonium chloride, and 1 part of dimethylaminoethyl methacrylate.

[0056] The anode plate 3 is made of Fe2O3, and the cathode plate 4 is made of stainless steel. The working voltage during electrochemical treatment is 2.5V, the working current is 20mA, and the frequency of ultrasonic vibration is 20kHz.

[0057] Example 2:

[0058] A method for removing fluoride ions in organic wastewater by coupling electrocoagulation with a catalyst comprises the following steps:

[0059] S1. Preparation of flocculant:

[0060] S1-1 Preparation of Reagent A:

[0061] 13 parts of sodium dodecylbenzenesulfonate, 8 parts of acrylamide polymer, 6.6 parts of a chelating agent, 8 parts of methyl methacrylate, 9 parts of polyvinyl acetate, and 5 parts of citric acid are placed in a mixer and mixed to obtain a mixed powder. Water is added to the mixer in a mass ratio of water to the mixed powder of 1:2. The mixing process is accompanied by heating. After the water is evaporated, reagent A is obtained;

[0062] Preparation of S1-2 Reagent B:

[0063] 6 parts of aluminum sulfate, 13 parts of ferric chloride, 11 parts of activated carbon, 4.6 parts of a cross-linking agent, and 5 parts of plant starch are placed in a mixer and mixed by adding water. The mass of water accounts for 25% of the total mass of the substances in the mixer. After the mixing is completed, the mixture is dried and ground. After the drying is completed, reagent B is obtained by grinding.

[0064] S2. Treatment of fluoride-containing wastewater:

[0065] The wastewater is passed into a wastewater electrochemical treatment device, and the reagent B obtained in step S1-2 is first poured into the wastewater electrochemical treatment device, the amount of the reagent B added is 1.5 g / L, the wastewater is stirred by the wastewater electrochemical treatment device, and stirred for 30 minutes. At the same time, the anode plate 3 and the cathode plate 4 of the wastewater electrochemical treatment device are energized to electrochemically treat the wastewater. After the stirring is completed, the reagent A is added and the stirring is continued for 15 minutes. The amount of the reagent A added is 2.5 g / L. The stirring process after the addition of the reagent A is accompanied by ultrasonic vibration. After the stirring is completed, the wastewater is allowed to stand for 8 minutes;

[0066] S3: Separation of precipitate:

[0067] The supernatant is pumped out of the device through the wastewater electrochemical treatment device, and the sediment at the bottom of the device is discharged through the bottom of the wastewater electrochemical treatment device.

[0068] The mixer speed in S1-1 is 130 r / min, the mixing time is 18 min, and the heating temperature during the mixing process is 105°C.

[0069] The speed of the mixer in S1-2 is 190 r / min, the mixing time is 15 min, the drying temperature of the drying treatment is 100° C., the drying time is 13 min, and the particle size of the reagent B after grinding is 90 μm.

[0070] The chelating agent in S1-1 is composed of the following components in parts by weight: 5 parts of calcium aluminum ferric silicate, 0.4 parts of triethanolamine, 0.7 parts of sodium lauryl sulfate, and 0.5 parts of polyacrylamide.

[0071] The crosslinking agent in S1-2 is composed of the following components in parts by weight: 2.3 parts of polyethyleneimine, 1.2 parts of vinyltrimethylammonium chloride, and 1.1 parts of dimethylaminoethyl methacrylate.

[0072] The anode plate 3 is made of Fe2O3, and the cathode plate 4 is made of stainless steel. The working voltage during electrochemical treatment is 5V, the working current is 25mA, and the frequency of ultrasonic vibration is 23kHz.

[0073] Example 3:

[0074] A method for removing fluoride ions in organic wastewater by coupling electrocoagulation with a catalyst comprises the following steps:

[0075] S1. Preparation of flocculant:

[0076] S1-1 Preparation of Reagent A:

[0077] 15 parts of sodium dodecylbenzenesulfonate, 10 parts of acrylamide polymer, 11 parts of chelating agent, 11 parts of methyl methacrylate, 11 parts of polyvinyl acetate, and 7 parts of citric acid are placed in a mixer and mixed to obtain a mixed powder. Water is added to the mixer in a mass ratio of water to mixed powder of 1:2. The mixing process is accompanied by heating. After the water is evaporated, reagent A is obtained;

[0078] Preparation of S1-2 Reagent B:

[0079] 8 parts of aluminum sulfate, 15 parts of ferric chloride, 15 parts of activated carbon, 5 parts of a cross-linking agent, and 7 parts of plant starch are placed in a mixer and mixed by adding water. The mass of water accounts for 30% of the total mass of the substances in the mixer. After the mixing is completed, the mixture is dried and ground. After the drying is completed, reagent B is obtained by grinding.

[0080] S2. Treatment of fluoride-containing wastewater:

[0081] The wastewater is passed into a wastewater electrochemical treatment device, and the reagent B obtained in step S1-2 is first poured into the wastewater electrochemical treatment device, the amount of the reagent B added is 2 g / L, the wastewater is stirred by the wastewater electrochemical treatment device, and stirred for 40 minutes. At the same time, the anode plate 3 and the cathode plate 4 of the wastewater electrochemical treatment device are energized to electrochemically treat the wastewater. After the stirring is completed, the reagent A is added and the stirring is continued for 20 minutes. The amount of the reagent A added is 3 g / L. The stirring process after the addition of the reagent A is accompanied by ultrasonic vibration. After the stirring is completed, the wastewater is allowed to stand for 10 minutes;

[0082] S3: Separation of precipitate:

[0083] The supernatant is pumped out of the device through the wastewater electrochemical treatment device, and the sediment at the bottom of the device is discharged through the bottom of the wastewater electrochemical treatment device.

[0084] The mixer speed in S1-1 is 150 r / min, the mixing time is 25 min, and the heating temperature during the mixing process is 110°C.

[0085] The speed of the mixer in S1-2 is 200 r / min, the mixing time is 20 min, the drying temperature of the drying treatment is 110° C., the drying time is 15 min, and the particle size of the reagent B after grinding is 100 μm.

[0086] The chelating agent in S1-1 is composed of the following components in parts by weight: 9 parts of calcium aluminum ferric silicate, 0.5 parts of triethanolamine, 0.9 parts of sodium lauryl sulfate, and 0.6 parts of polyacrylamide.

[0087] The crosslinking agent in S1-2 is composed of the following components in parts by weight: 2.5 parts of polyethyleneimine, 1.3 parts of vinyltrimethylammonium chloride, and 1.2 parts of dimethylaminoethyl methacrylate.

[0088] The anode plate 3 is made of Fe2O3, and the cathode plate 4 is made of stainless steel. The working voltage during electrochemical treatment is 8V, the working current is 30mA, and the frequency of ultrasonic vibration is 25kHz.

[0089] Comparing Examples 1 to 3, Example 3 has the highest efficiency and the best effect in removing fluoride ions from fluoride-containing wastewater, so Example 3 is the best example.

[0090] Example 4:

[0091] This embodiment 4 describes the specific structure of the wastewater electrochemical treatment equipment in step S2 of embodiments 1-3. The wastewater electrochemical treatment equipment includes a treatment chamber 1, a support frame 2 is provided at the bottom of the treatment chamber 1, an anode plate 3 and a cathode plate 4 are fixedly connected to the left and right sides of the inner wall of the treatment chamber 1, an additive port 5 and a water inlet pipe 6 are fixedly connected to the upper left side of the treatment chamber 1, a decanter 7 is provided above the treatment chamber 1, and a sewage pipe 8 is provided at the bottom right side of the treatment chamber 1.

[0092] The decanter 7 includes a telescopic tube 71, the upper end of the telescopic tube 71 is fixedly connected to the top of the processing chamber 1, and a plurality of connecting tubes 72 are horizontally fixedly connected to the side wall of the lower end of the telescopic tube 71. The connecting tubes 72 are connected to the inside of the side wall of the telescopic tube 71, and the outer end of the telescopic tube 71 is fixedly connected to the buoyancy ring 73. The top of the telescopic tube is connected to a water pump 74, and a connecting rod 75 is fixedly connected to the left and right side walls of the water pump 74. The lower end of the connecting rod 75 is fixedly connected to the top of the processing chamber 1, and the water outlet of the water pump 74 is connected to a water pump pipe 76.

[0093] A stirring motor 11 is provided at the bottom of the processing bin 1 . A stirring rod 12 is transmission-connected to the output shaft of the stirring motor 11 . The stirring rod 12 is rotationally connected to the bottom of the processing bin 1 .

[0094] An ultrasonic oscillator 9 for ultrasonically vibrating the wastewater is provided at the bottom of the treatment chamber 1 .

[0095] The wastewater electrochemical treatment equipment in Example 4 forms an electrolytic cell through the anode plate 3 and the cathode plate 4 in the treatment chamber 1. Reagent B contains a large amount of metal ions to form an electrolyte, which then combines with the fluoride ions in the wastewater to form a precipitate, and the fluoride ion removal efficiency is high.

[0096] The ultrasonic oscillator 9, water pump 74, and stirring motor 11 used in the above embodiments are all commercially available products. As long as they can achieve the functions of the present invention, those skilled in the art can choose to use them according to common sense, and no special restrictions are made here.

Claims

1. A method for removing fluoride ions in organic wastewater by coupling electrocoagulation with a catalyst, characterized in that: The following steps are involved: S1. Preparation of flocculant: S1-1 Preparation of Reagent A: 10-15 parts of sodium dodecylbenzenesulfonate, 7-10 parts of acrylamide polymer, 5-11 parts of a chelating agent, 7-11 parts of methyl methacrylate, 5-11 parts of polyvinyl acetate, and 4-7 parts of citric acid are placed in a mixer and mixed to obtain a mixed powder. Water is added to the mixer in a mass ratio of water to the mixed powder of 1:

2. The mixing process is accompanied by heating. After the water is evaporated, reagent A is obtained; Preparation of S1-2 Reagent B: 5-8 parts of aluminum sulfate, 10-15 parts of ferric chloride, 10-15 parts of activated carbon, 4-5 parts of a cross-linking agent, and 3-7 parts of plant starch are placed in a mixer and then water is added for mixing, with the mass of water accounting for 20-30% of the total mass of the materials in the mixer. After the mixing is completed, the materials are dried and ground after drying to obtain reagent B; S2. Treatment of fluoride-containing wastewater: The wastewater is passed into the wastewater electrochemical treatment equipment, and the reagent B obtained in the step S1-2 is first poured into the wastewater electrochemical treatment equipment, the amount of the reagent B added is 1-2 g / L, the wastewater is stirred by the wastewater electrochemical treatment equipment, and stirred for 20-40 minutes. At the same time, the anode plate (3) and the cathode plate (4) of the wastewater electrochemical treatment equipment are energized to electrochemically treat the wastewater. After the stirring is completed, the reagent A is added and the stirring is continued for 10-20 minutes. The amount of the reagent A added is 2-3 g / L. The stirring process after the addition of the reagent A is accompanied by ultrasonic vibration. After the stirring is completed, the wastewater is allowed to stand for 5-10 minutes. S3: Separation of precipitate: The supernatant is pumped out of the device through the wastewater electrochemical treatment device, and the sediment at the bottom of the device is discharged through the bottom of the wastewater electrochemical treatment device.

2. The method for removing fluoride ions in organic wastewater by electrocoagulation and catalyst coupling according to claim 1, characterized in that: The mixer speed in step S1-1 is 120-150 r / min, the mixing time is 10-25 min, and the heating temperature during the mixing process is 100-110°C.

3. The method for removing fluoride ions in organic wastewater by coupling electrocoagulation and catalyst according to claim 1, characterized in that: In step S1-2, the mixer speed is 180-200 r / min, the mixing time is 10-20 min, the drying temperature of the drying process is 90-110° C., the drying time is 10-15 min, and the particle size of the reagent B after grinding is 80-100 μm.

4. The method for removing fluoride ions in organic wastewater by coupling electrocoagulation and catalyst according to claim 1, characterized in that: The chelating agent in step S1-1 is composed of the following components in parts by weight: 4-9 parts of calcium aluminum ferric silicate, 0.3-0.5 parts of triethanolamine, 0.5-0.9 parts of sodium lauryl sulfate, and 0.2-0.6 parts of polyacrylamide.

5. The method for removing fluoride ions in organic wastewater by coupling electrocoagulation and catalyst according to claim 1, characterized in that: The crosslinking agent in step S1-2 is composed of the following components in parts by weight: 2-2.5 parts of polyethyleneimine, 1-1.3 parts of vinyltrimethylammonium chloride, and 1-1.2 parts of dimethylaminoethyl methacrylate.

6. The method for removing fluoride ions in organic wastewater by coupling electrocoagulation and catalyst according to claim 1, characterized in that: The anode plate (3) is made of Fe2O3, and the cathode plate (4) is made of stainless steel. The working voltage during electrochemical treatment is 2.5-8V, the working current is 20-30mA, and the frequency of ultrasonic vibration is 20-25kHz.

7. The method for removing fluoride ions in organic wastewater by coupling electrocoagulation and catalyst according to claim 1, characterized in that: The wastewater electrochemical treatment equipment in step S2 comprises a treatment chamber (1), a support frame (2) is provided at the bottom of the treatment chamber (1), an anode plate (3) and a cathode plate (4) are fixedly connected to the left and right sides of the inner wall of the treatment chamber (1), an additive port (5) and a water inlet pipe (6) are fixedly connected at the upper left side of the treatment chamber (1), a decanter (7) is provided above the treatment chamber (1), and a sewage pipe (8) is provided at the bottom right side of the treatment chamber (1).

8. The method for removing fluoride ions in organic wastewater by coupling electrocoagulation and catalyst according to claim 7, characterized in that: The decanter (7) comprises a telescopic tube (71), the upper end of the telescopic tube (71) is fixedly connected to the top of the processing chamber (1), the lower end side wall of the telescopic tube (71) is horizontally fixedly connected to a plurality of connecting tubes (72), the connecting tubes (72) are communicated with the inside of the side wall of the telescopic tube (71), the outer end of the telescopic tube (71) is fixedly connected to a buoyancy ring (73), the top of the telescopic tube is communicated with a water pump (74), the left and right side walls of the water pump (74) are fixedly connected to a connecting rod (75), the lower end of the connecting rod (75) is fixedly connected to the top of the processing chamber (1), and the water outlet of the water pump (74) is communicated with a water pump pipe (76).

9. The method for removing fluoride ions in organic wastewater by coupling electrocoagulation and catalyst according to claim 7, characterized in that: A stirring motor (11) is provided at the bottom of the processing bin (1), and a stirring rod (12) is transmission-connected to the output shaft of the stirring motor (11), and the stirring rod (12) is rotationally connected to the bottom of the processing bin (1).

10. The method for removing fluoride ions in organic wastewater by coupling electrocoagulation and catalyst according to claim 7, characterized in that: A stirring motor (11) is provided at the bottom of the processing bin (1), and a stirring rod (12) is transmission-connected to the output shaft of the stirring motor (11), and the stirring rod (12) is rotationally connected to the processing bin (1).

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