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Treatment method of fluorine-containing waste water of solar cell plant

A technology of solar cells and treatment methods, which is applied in the fields of energy waste water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high cost and incomplete treatment of fluorine-containing waste water, and achieves easy operation. The effect of easy operation, high defluorination efficiency and high utilization value

Active Publication Date: 2012-05-16
SHENZHEN TOPRAY SOLAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a treatment method for fluorine-containing wastewater in a solar cell factory, aiming to solve the problems of incomplete treatment of fluorine-containing wastewater and high cost

Method used

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  • Treatment method of fluorine-containing waste water of solar cell plant

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Experimental program
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Effect test

Embodiment 1

[0032] The fluorine-containing waste acid is diluted to F in the storage tank - If the concentration is below 5000mg / L, it will be transferred to the reaction tank, and excessive slaked lime slurry (Ca(OH) 2 The molar mass is F - 2 times the total molar weight), so that the calcium source and F in the reaction pool - Fully reacted, the pH in the reaction pool was 7.4, and the F- concentration dropped to 15mg / L. Then it is discharged into the sedimentation tank, and about 0.8mg of aluminum chloride and 2mg of polyacrylamide are put into the mixed flocculant per liter of wastewater, stirred, left to settle, and the F-concentration of the supernatant is reduced to 6mg / L. Finally, the clarified neutral waste water is discharged, and the calcium fluoride precipitate is recovered.

Embodiment 2

[0034] The fluorine-containing waste acid liquid is diluted in the storage tank until the concentration of F- drops to 5000mg / L, then transferred to the reaction tank, and excessive slaked lime slurry (Ca(OH) 2 The molar mass is F - 2.5 times of the total molar weight), so that the calcium source in the reaction tank and F- fully react, the pH in the reaction tank=7.4, and the F-concentration drops to 15mg / L. Then it is discharged into the sedimentation tank, and about 1 mg of aluminum chloride and 2.5 mg of polyacrylamide are put into each liter of waste water, stirred, left to settle, and the F- concentration of the supernatant is reduced to 5 mg / L. Finally, the clarified neutral waste water is discharged, and the calcium fluoride precipitate is recovered.

Embodiment 3

[0036] The fluorine-containing waste acid solution is diluted in the storage tank until the concentration of F- drops to 5000mg / L, then transferred to the reaction tank, and 0.2mm limestone particles (CaCO 3 The molar mass is F - 4 times of the total molar amount) excess slaked lime slurry makes the calcium source in the reaction tank fully react with F-, the pH in the reaction tank=6.8, and the F-concentration drops to 20mg / L. Then it is discharged into the sedimentation tank, and about 0.8mg of aluminum chloride and polyacrylamide mixed with 0.8mg of flocculant are put into each liter of wastewater, stirred, left to settle, and the F-concentration of the supernatant is reduced to 7mg / L. Finally, the clarified neutral waste water is discharged, and the calcium fluoride precipitate is recovered.

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Abstract

The invention is applicable to industrial fluorine-containing waste water treatment, and provides a treatment method of fluorine-containing waste water of solar cell plants; the method comprises the following steps: storing or diluting fluorine-containing waste water in a material-storing tank, decreasing the F- concentration to below 5000 mg / L; discharging the fluorine-containing waste water into a reaction tank, adding excessive calcium sources; discharging the solution in the reaction tank into a sedimentation tank, adding a coagulant and a flocculant; discharging the clarified waste water from the sedimentation tank, recovering calcium fluoride sediments. The calcium sources used in the invention has a wide source, is economical and cheap; the operation process is simple and practical; the fluorine-removing efficiency is high; and the treated product has high application value.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a treatment method for fluorine-containing wastewater of a solar cell factory. Background technique [0002] Fluoride can accumulate in groundwater and soil, resulting in different concentrations of fluoride-containing drinking water. Excessive intake of fluorine will bring harm to human health. Intake of high doses of fluorine will cause acute fluorosis, which is manifested as the pathological characteristics of irritating poisons, and then various enzyme systems will be damaged. With the rapid development of the solar energy industry, the treatment of the fluorine-containing waste acid produced by it has aroused everyone's strong attention. The discharge of fluorine-containing industrial wastewater must be strictly controlled, and it must be treated before discharge to meet the national discharge standard (national first-level discharge standard: the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01F11/22C02F1/52
CPCY02A20/212Y02P20/133Y02W10/37
Inventor 陈五奎刘建陈嘉豪李军胡文祥刘强
Owner SHENZHEN TOPRAY SOLAR
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