Method for improving reverse osmosis defluorination efficiency

A technology of reverse osmosis and reverse osmosis membrane, applied in chemical instruments and methods, permeation/dialysis water/sewage treatment, water/sewage treatment, etc., can solve the problems of low separation efficiency of reverse osmosis and small atomic radius of fluorine ions, etc. Achieve the effect of reducing the concentration of fluoride ions and improving the interception efficiency

Active Publication Date: 2013-09-11
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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  • Summary
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AI Technical Summary

Problems solved by technology

[0006] The present invention mainly aims at the problem that the atomic radius of fluorine ions is small and the separation efficiency of reverse osmos

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The main electrolytes of the influent are fluoride ions, potassium ions, sulfate ions and sodium ions. The fluoride ion concentration is 20mg / L. The concentration of triethanolamine added to the influent water is 18mg / L, and the RO1812 aromatic polyamide reverse osmosis membrane of SEPRO Company of the United States is used for separation, and the water temperature is about 20°C. The membrane pressure is controlled at 0.3MPa, and the fluoride ion removal rate reaches 99.7%.

Embodiment 2

[0019] The main electrolytes of the influent are fluoride ions, potassium ions, sulfate ions and sodium ions. The fluoride ion concentration is 20mg / L. The concentration of triethanolamine added to the influent water is 20mg / L, and the RO1812 aromatic polyamide reverse osmosis membrane of SEPRO Company of the United States is used for separation, and the water temperature is about 20°C. The membrane pressure is controlled at 0.6MPa, and the removal rate of fluoride ion reaches 97.5%.

Embodiment 3

[0021] The main electrolytes of the influent are fluoride ions, potassium ions, sulfate ions and sodium ions. The fluoride ion concentration is 50mg / L. The concentration of triethanolamine added to the influent water is 5mg / L, and the seawater desalination reverse osmosis membrane of American Hyde Energy Company is used for separation, and the water temperature is about 20°C. The membrane pressure is controlled at 1.6MPa, and the removal rate of fluoride ion reaches 98.0%.

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Abstract

The invention discloses a method for improving the reverse osmosis defluorination efficiency, which comprises the following steps of: adding triethanolamine into raw water needing defluorination; and performing reverse osmosis membrane treatment through a reverse osmosis membrane to remove fluorine ions. The removal rate of fluorine ions can exceed 99%.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a method for improving the efficiency of reverse osmosis to remove fluorine. Background technique [0002] Fluorine is necessary for the healthy growth of humans and livestock. my country stipulates that the appropriate concentration range of fluorine in drinking water is 0.5-1.0mg / L. When the fluoride concentration in drinking water is too low, long-term drinking will affect the health of teeth. However, when the fluorine concentration in drinking water exceeds 1.5 mg / L, fluorine will cause harm to human body functions. Long-term drinking of water with excessive fluorine content will cause bone fluorosis and dental fluorosis. Excess fluorine can also inhibit antioxidant enzymes, thereby generating a large number of free radicals and causing lipid peroxidation, resulting in abnormal biofilm structure and affecting cell function. [0003] The content of fluoride ion in the ...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F1/58
Inventor 陆继来曹桂萍吴海锁曹蕾涂勇林乔乔刘伟京
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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