Electroflocculation method and device for simultaneously removing fluorine and cadmium from rural groundwater

A technology of electrocoagulation and groundwater, applied in the field of electrocoagulation, can solve the problems of difficult dehydration, high treatment cost, large amount of sludge, etc., and achieve the effect of fast removal rate, fast clarification speed, and small amount of sludge

Pending Publication Date: 2019-02-26
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the chemical precipitation method is the most widely used, but this method needs to add chemical agents to the wastewater as a flocculant, which has strict requirements on the pH value of the reaction environment, the amount of sludge after treatment is large, it is not easy to dehydrate, and the follow-up treatment cost is high.

Method used

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  • Electroflocculation method and device for simultaneously removing fluorine and cadmium from rural groundwater
  • Electroflocculation method and device for simultaneously removing fluorine and cadmium from rural groundwater
  • Electroflocculation method and device for simultaneously removing fluorine and cadmium from rural groundwater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Use tap water to prepare raw water containing F-concentration of 5mg L-1 and Cd2+ concentration of 0.5mg L-1, with a pH value of 3, and enter the electrocoagulation reaction tank 6 from the water inlet 4 of the electrocoagulation device (the size is 120mm× 100mm×180 mm, effective volume 2L, using figure 1 In the shown device, seven iron plates 2, 3 and 5 are placed in parallel and crossed, and the distance between the plates is 5mm) for processing, the current density is 9.8mA / cm2, and the electrolysis time is 65min. After electrocoagulation, it enters the clarification tank 8 through the drainage tube 7, stands still for 15 minutes, and is discharged from the water outlet 9 after clarification and precipitation. Water samples were taken to test relevant water quality indicators. The test results showed that the removal rate of cadmium was 100%, and the removal rate of fluorine was greater than 80.01%. The quality of the effluent water conforms to my country's "Drinkin...

Embodiment 2

[0029] Prepare raw water containing F-concentration of 2mg L-1 and Cd2+ concentration of 0.5mg L-1 with tap water. 100 mm×180mm, effective volume 2L, using figure 1 In the shown device, seven iron plates 2, 3 and 5 are crossed and placed in parallel, and the distance between the plates is 5mm) for processing, the current density is 9.8mA / cm2, and the electrolysis time is 55min. After electrocoagulation, it enters into the clarification tank 8 through the drainage pipe 7, stands still for 15 minutes, and is discharged from the water outlet 9 after clarification and precipitation. Water samples were taken to test relevant water quality indicators. The test results showed that the removal rate of cadmium was 100%, and the removal rate of fluorine was greater than 84.03%. The quality of the effluent water conforms to my country's "Drinking Water Sanitation Standard" (GB5749-2006), and reaches the first-class standard of "Groundwater Environmental Quality Standard GB / T14848-93". ...

Embodiment 3

[0031] Use tap water to prepare raw water containing F- concentration of 5 mg L-1 and Cd2+ concentration of 0.5 mg L-1, pH value is 7, and directly enters the electrocoagulation device (dimensions 120 mm × 100 mm × 180 mm, effective volume 2 L, using figure 1 The shown device, the distance between the pole plates is 5mm) for processing, the current density is 9.8mA / cm2, and the electrolysis time is 45min. After electrocoagulation, it enters the clarification tank 8 through the drainage tube 7, stands still for 15 minutes, and is discharged from the water outlet 9 after clarification and precipitation. Water samples were taken to test relevant water quality indicators. The test results showed that the removal rate of cadmium was 100%, and the removal rate of fluorine was 75.64%. The quality of the effluent water conforms to my country's "Drinking Water Sanitation Standard" (GB5749-2006), and reaches the first-class standard of "Groundwater Environmental Quality Standard GB / T148...

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Abstract

The invention relates to an electroflocculation method and an electroflocculation device for simultaneously removing fluorine and cadmium from rural groundwater. The electroflocculation device comprises a power supply, an electroflocculation reaction tank, anode plates, cathode plates, bipolar plates, a clarification tank and a drainage pipe, wherein the cathode plates and the anode plates are incrossing interval placement; meanwhile, the bipolar plates are inserted between the cathode plates and the anode plates; the cathode plates and the anode plates are separately connected through conductive wires, and are connected to the negative electrode and the positive electrode of the power supply respectively; the polar plates are arranged inside the electroflocculation reaction tank; the electroflocculation reaction tank is connected with the clarification tank through the drainage pipe; a water inlet is formed in the lower part of the electroflocculation reaction tank. The electroflocculation method is simple; by the electroflocculation method, the pollutant removing efficiency is high; the electroflocculation method is a novel method for removing the fluorine and the cadmium from the groundwater, by which addition of a chemical is not required and operation is flexible and simple.

Description

technical field [0001] The invention designs an electrocoagulation method and device for simultaneously removing fluorine and cadmium in groundwater, belongs to the field of water pollution control, and is suitable for groundwater treatment. Background technique [0002] The rapid development of urbanization and industrialization in my country has made the development and utilization of groundwater more extensive and urgent. Most countries in the world have problems such as excessive fluorine and heavy metal pollution in groundwater to varying degrees. Fluorine is an essential element for the human body, but excessive intake can lead to fluorosis, symptoms such as dental fluorosis, joint and bone pain throughout the body. Heavy metal cadmium pollutants are extremely harmful to animals and human life and health, and can cause functional disorders in the kidney, reproductive system, liver, brain, and central nervous system. Therefore, it is of great significance to carry out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/463C02F101/14C02F101/20C02F103/06
CPCC02F1/463C02F2101/20C02F2101/14C02F2103/06
Inventor 周少奇刘兴
Owner SOUTH CHINA UNIV OF TECH
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