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Combined electric flocculation defluorination process and uses thereof

An electro-flocculation and process technology, applied in the field of combined electro-flocculation defluorination process, can solve the problem of no combined electro-flocculation de-fluorination process and the like

Active Publication Date: 2009-05-13
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no relevant report on combined electrocoagulation defluorination process

Method used

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  • Combined electric flocculation defluorination process and uses thereof
  • Combined electric flocculation defluorination process and uses thereof
  • Combined electric flocculation defluorination process and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The experimental water was artificially prepared: 2.0mM NaCl and an appropriate amount of NaF were added to deionized water so that the initial fluoride ion content was 10mg / L. An aluminum plate (99.999% pure) is used as the anode, and a copper plate is used as the cathode. The area of ​​the electrode is 90mm×60mm, and the distance between the plates is 10mm. The experimental water was 300mL, and the electrolysis time was 10min. The research shows that the fluoride removal rate varies with γ Alkalinity+F The change. The experimental results show that for each Al 3+ dosage, when γ Alkalinity+F (In this example, the distribution water contains only OH - Alkalinity, so γ Alkalinity+F = γ OH+F ) close to 3.0, combined electrocoagulation can achieve the highest fluorine removal efficiency. For specific experimental data, see figure 1 .

Embodiment 2

[0039] Example 2: Verifying the presence of HCO in raw water 3 - Alkalinity, by HCO 3 - The concentration of γ is corrected to control γ Alkalinity+F =3.0

[0040] Make the combined electrocoagulation achieve the highest fluoride removal rate (experimentally obtained HCO 3 - The correction factor for alkalinity is 0.6).

[0041] The experimental water was artificially prepared: 2.0mM NaCl and an appropriate amount of NaF were added to deionized water so that the initial fluoride ion content was 10mg / L. An aluminum plate (99.999% pure) is used as the anode, and a copper plate is used as the cathode. The area of ​​the electrodes is 90mm×60mm, and the distance between the plates is 10mm. The experimental water was 300mL, and the electrolysis time was 10min. The total aluminum concentration is 1.2mM / L, the study HCO 3 - The fluorine removal rate when the concentration is 1.0mM / L, 1.5mM / L, 2.0mM / L, 2.5mM / L, 3.0mM / L respectively. Initial HCO 3 - Concentration in the ra...

Embodiment 3

[0042] Embodiment 3: do experimental verification with actual groundwater, in HCO 3 - After correcting the concentration, the fluoride removal rate is at γ Alkalinity+F =3.0

[0043] obtain the maximum value.

[0044] The raw water was taken from the groundwater of Peking University (pH=7.95). By potentiometric titration, the alkalinity type was bicarbonate type, and the initial HCO 3 - The concentration is 2.362mM. After α correction, the design of the combined electrocoagulation defluorination experiment was carried out.

[0045] An aluminum plate (99.999% pure) is used as the anode, and a copper plate is used as the cathode. The area of ​​the electrode is 90mm×60mm, and the distance between the plates is 10mm. The experimental water was 300mL, and the electrolysis time was 10min. in total Al 3+ When the dosage is 1.2mM / L, according to different γ Alkalinity+F value to calculate the AlCl that should be added 3 And the current intensity that should be maintained du...

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Abstract

The invention relates to a combined electric flocculation fluorine removal process and application thereof. The process is the combination of chemical coagulation and electric coagulation, namely the combined electric flocculation. Regarding fluorine-contained water with different alkalinities, the process reaches the highest fluorine removal rate through controlling the formula of Gamma Alkalinity+F=3. However, the formula is needed to be rectified; and the detailed process is shown in an instruction. The process has the advantages that the combined electric flocculation reaches the highest fluorine removal rate through controlling the formula of Gamma Alkalinity+F=3, thereby avoiding the situation of excessive acid or alkaline added for controlling the pH value; the combined electric flocculation has less electricity consumption which is less than one third of that of an electric flocculation process; the combined electric flocculation process not only reduces the consumption of electric energy and aluminium sheets, but also retains the advantages of the electric flocculation on the electric field action while ensuring high efficiency for fluorine removal; therefore, the process has good application prospect. The combined electric flocculation fluorine removal process is applied to the deepened fluorine removal for fluorine-contained ground water and other fluorine-contained wastewater.

Description

technical field [0001] The invention belongs to the technical field of groundwater defluorination in the field of water treatment, and specifically relates to a combined electrocoagulation defluorination process and its application. Background technique [0002] Defluoridation of groundwater has always been a hot issue in the study of defluoridation of drinking water. Whether it is chemical coagulation or electrochemical coagulation, the fluoride removal efficiency is related to the pH, alkalinity, coexisting ions and other characteristics of the solution. Chemical coagulation and electrochemical coagulation have the highest fluorine removal efficiency when the pH is 5.5-6.5. In actual operation, the control of pH is generally achieved by adding acid or alkali and monitoring the pH of the system at the same time. The pH of fluoride-containing water is sensitive to the addition of acid and alkali within this range, and F - with Al 3+ OH will be released after complexation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/463C02F1/58C02F101/14
Inventor 赵华章杨伟朱珺倪晋仁
Owner PEKING UNIV
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