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Method for removing fluorine in wastewater

A waste water, packed bed technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of converter steel slag not being processed and utilized in time, and achieve huge social and economic benefits, reducing The hidden danger of human health hazards and the effect of reducing costs

Inactive Publication Date: 2009-07-08
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, there are still a large amount of converter steel slag that has not been processed and utilized in time

Method used

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  • Method for removing fluorine in wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Fluoride ion concentration in wastewater is 15-30mg / L. Fill the steel slag into a primary packing bed. The particle size combination of the steel slag in the packing bed is: the ratio of 5-20mm particle size steel slag to 2-5mm particle size steel slag is 1:5; the fluorine-containing waste water flows through the steel slag packing bed from bottom to top to control The residence time of fluorine-containing wastewater is 1 hour. After the treatment of the steel slag packing bed, the concentration of fluorine in the effluent is reduced to about 5mg / L. The removal rate of fluoride ion in wastewater is 66.7%-88.3%.

Embodiment 2

[0033] Fluoride ion concentration in wastewater is 50-70mg / L. Fill the steel slag into a secondary packing bed. The particle size combination of steel slag in the first-stage packed bed is: steel slag with a particle size of 10-20mm, steel slag with a particle size of 5-10mm and steel slag with a particle size of 2-5mm at a ratio of 1:2:2; the steel slag in the second-stage packed bed The particle size combination is: the ratio of 5-20m particle size steel slag to 2-5mm particle size steel slag is 1:6. The fluorine-containing wastewater flows through the steel slag packing bed from bottom to top, and the residence time of the fluoride-containing wastewater is controlled to 40 minutes, and the concentration of fluorine in the effluent is reduced to 5-8mg / L. The removal rate of fluoride ion in wastewater is 84%-93%.

Embodiment 3

[0035]Fluoride ion concentration in wastewater is 100-150mg / L. Fill the steel slag into a three-stage packing bed. The particle size combination of steel slag in the first-stage packed bed is: steel slag with a particle size of 15-20mm, steel slag with a particle size of 10-15mm and steel slag with a particle size of 5-10mm at a ratio of 1:1:3; the steel slag in the second-stage packed bed The particle size combination is: 10-15mm particle size steel slag, 5-10mm particle size steel slag and 2-5mm particle size steel slag ratio is 1:2:5, the particle size combination of steel slag in the third stage packed bed is: 10-15mm particle size The ratio of diameter steel slag, 2-5mm particle size steel slag and 1-2mm particle size steel slag is 1:3:3. The fluorine-containing wastewater flows through the steel slag packing bed from bottom to top, and the residence time of the fluorine-containing wastewater is controlled to 30 minutes, and the concentration of fluorine in the effluent ...

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Abstract

The invention provides a method for removing fluorine in wastewater. The method comprises the following steps: (1) sifting of steel slag; (2) filling of the sifted steel slag into a filling bed according to the combination of size of particle diameter; and (3) introduction of fluorine-containing wastewater to the bottom of the filling bed. The method removes the fluorine in the wastewater, reduces cost for wastewater treatment and achieves the aim of resource utilization of the steel slag.

Description

technical field [0001] The invention belongs to the field of environmental protection and resource utilization, in particular relates to waste water treatment and secondary utilization of steel slag, in particular to the treatment of fluorine-containing waste water. Background technique [0002] Fluoride is one of the essential trace elements for the human body, and the daily intake of fluoride for adults is generally 1.0-1.5mg. Some researchers believe that adding fluoride to water is effective in reducing tooth decay. In the United States, water fluoride has been advocated for many years to prevent tooth decay in children. However, recent survey data show that the cancer mortality rate in cities with fluoridation in drinking water is lower than that in cities without fluoride. high. More information shows that excessive intake of fluorine can affect health and even cause poisoning. Endemic fluorosis is a systemic disease that not only affects bones and teeth, forms denta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/52C02F101/14C02F101/36
Inventor 董晓丹侯红娟
Owner BAOSHAN IRON & STEEL CO LTD
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