Method for removing fluorinion in waste water

A fluoride ion and waste water technology, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of complicated steps, many kinds of chemical agents, complicated operation, etc.

Active Publication Date: 2007-10-31
JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD
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Problems solved by technology

[0004] The main defect of the aforementioned treatment process is that it is necessary to determine and control the amount of calcium carbonate, hydrochloric acid, sodium hydroxide, sodium polymetaphosphate, and active aluminum based on the amount of wastewater and the content of fluoride ions in it, which makes the chemical used in wastewater treatment There are many types of medicines, complicated steps and complex operations

Method used

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  • Method for removing fluorinion in waste water
  • Method for removing fluorinion in waste water

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Embodiment Construction

[0014] With reference to accompanying drawing 1 and Fig. 2, in one embodiment of the present invention, the waste water to be treated is the industrial waste water containing the high concentration fluorine ion discharged by the semiconductor production plant, and its pH value is about 2.5, and the fluorine ion concentration is 300mg / L or so, the waste water flow rate is 25-30m 3 / h, the volume of waste water entering is 180m 3 After adjusting the tank 1, pump it into the tank with a volume of 10m by the lift pump 2 3 In the first reaction tank 31, the dosing pump is controlled by the pH meter 4 to inject calcium hydroxide solution into the first reaction tank 31, so that the pH value of the waste water reaches 8.5, 9.0, and 9.5 respectively, and the stirring pump 5 is used to stir to increase the reaction intensity of the stirring. 600s-~700s-, the wastewater residence time is 15-20 minutes;

[0015] The resulting waste water injection volume is 15m 3 In the second reacti...

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Abstract

The invention discloses a method to remove fluorinion in waste water, which comprises the following steps: a, adding calcium hydrate solution into industrial waste water with fluorinion; stirring; adjusting the pH value of the waste water at 8. 5-9. 5; setting the reacting time at 15-20 min; b, adding aluminum sulfate solution into the waste water of the step a; stirring; adjusting the pH value of the waste water at 6. 0-6. 5; setting the reacting time at 20-25 min; c, adding polymeric flocculant into the waste water from the step b, stirring; injecting the waste water into desilter; proceeding flocculate deposition; discharging supernatant fluid; getting sediment; proceeding solid-liquid separation; outer-transporting or imbedding the solid sludge. This craft possesses simple procedure and convenient operation, which is fir for the plant with higher waste water output volume.

Description

technical field [0001] The invention relates to a method for removing fluoride ions in industrial waste water. Background technique [0002] Hydrofluoric acid is often used to clean the substrate glass in liquid crystal display and semiconductor production processes to improve the surface cleanliness of the substrate glass. The industrial wastewater produced in these processes contains high concentrations of fluorine ions, and is generally used everywhere. Its discharge is strictly regulated. In my country's national standards, the content of fluoride ions in the discharged industrial wastewater is not allowed to exceed 10mg / L. This is a rigid and minimum standard. Obviously, the content of fluoride ions in wastewater is even higher. If it is low, it will be more in line with the national industrial policy and more beneficial to the protection of the environment. [0003] The publication number is: CN1326900A, the publication date is: December 19, 2001, and the application nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/00C02F1/66C02F1/52C02F1/58
Inventor 廖志民黄玉和吴吉军郭景奎袁志华戴睿智史文彦邹霞赵敏慧夏晓春
Owner JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD
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