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Method for treating high-fluorine sewage water

A treatment method and sewage technology, applied in water/sewage treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as large consumption, high viscosity, excessive fluorine content in wastewater, etc., to achieve Low treatment cost and effect of reducing fluoride ion content

Inactive Publication Date: 2009-04-08
浙江汉盛氟化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lime is cheap, but its solubility is low, it can only be added in emulsion, because the generated CaF 2 The precipitate will be wrapped in Ca(OH) 2 The surface of the particles prevents them from being fully utilized, so the dosage is large
Furthermore, when adding milk of lime, even if the dosage makes the pH of the wastewater reach 12, it can only reduce the fluoride ion in the wastewater to about 15 mg / L, and the content of suspended solids in the water is very high, which cannot meet the national discharge standard.
[0006] In addition, the reason for the difficulty in governance lies in: CaF 2 It is a very fine particle with small specific gravity and high viscosity, which makes it very troublesome to separate CaF2, resulting in excessive fluorine content in wastewater

Method used

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  • Method for treating high-fluorine sewage water
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Examples

Experimental program
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Effect test

Embodiment 1

[0027] The fluorine-containing wastewater from the workshop is collected to the sewage regulating tank 13, and its F- concentration is detected to be 1200mg / l. The sewage is poured into the calcium hydroxide through the wastewater lifting pump and the amount of the 1# reaction tank (with a stirring device inside) is 40m 3 / h, the fluorine content in wastewater is 1.2kg / m 3 ×40m 3 / h=48kg / h; the content of Ca to be added is 48kg×3≈150kg, converted to Ca(OH) 2 It is 280kg, and it is configured as 5% lime emulsion in the lime milk preparation area, which is 5600kg emulsion, which is pumped to the lime milk dosing device (that is, the lime solution storage tank, with a stirring device inside), and flows to 1# reaction by flow meter The pool will react with fluorine-containing sewage to form calcium fluoride precipitates. Its pH value was detected to be 10.2, and it overflowed to the 2# reaction pool (with a stirring device inside). The dosage of calcium chloride is 280kg×40%=11...

Embodiment 2

[0030] The fluorine-containing wastewater from the workshop is collected to the sewage adjustment tank, and its F -The concentration is 800mg / l, and the amount of sewage poured into the calcium hydroxide neutralization reaction tank 1 (with a stirring device inside) through the wastewater lifting pump is 30m 3 / h, the fluorine content in wastewater is 0.8kg / m 3 ×30m 3 / h=24kg / h; the content of Ca to be added is about 24kg×3≈75kg, converted to Ca(OH) 2 It is 140kg, and it is configured as 5% lime emulsion in the lime milk preparation area, which is 2800kg emulsion. It is pumped to the lime milk dosing device (that is, the lime milk storage tank, with a stirring device inside), and flows to the reaction tank through the flow meter. The fluoride-containing sewage undergoes a neutralization reaction to form calcium fluoride precipitates. Detect that its pH value is 10.5, and overflow to the calcium chloride reaction tank 2 (stirring device is arranged in it). The dosage of cal...

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Abstract

The invention provides a method for treating highly fluorine-contained wastewater, wherein four reaction tanks orderly overflowed are used, according to the weight ratio of calcium to fluorine of 3 to 1, the wastewater is fully mixed with calcium hydroxide solution with the concentration of 5 percent in the No. 1 reaction tank; in the No. 2 reaction tank, the overflowed water of the No. 1 reaction tank is fully mixed with calcium chloride solution of calcium hydroxide emulsion of which the concentration is 8 percent and the weight is 40 percent of the weight of the overflowed water of the No. 1 reaction tank; in the No. 3 reaction tank, the overflowed water of the No. 2 reaction tank is mixed with polyaluminum solution of which the concentration is 1 percent and the weight is 40 mg for each liter of the overflowed water of the No. 2 reaction tank; in the No. 4 reaction tank, the overflowed water of the No. 3 reaction tank is mixed with the polyacrylamide solution of which the concentration is 10 percent and the weight is 20 mg for each liter of the overflowed water of the No. 3 reaction tank; and the treated water from the No. 4 reaction tank is sent in a radial flow type sedimentation tank, and the supernatant of the radial flow type sedimentation tank is discharged into a clear water tank, and lower layer sludge is pumped in a sludge thickener for further sedimentation and separation. The fluoride concentration of the industrial wastewater is reduced to below 10 mg / L after being treated, thereby meeting the national pollution discharge standards.

Description

【Technical field】 [0001] The invention relates to a sewage treatment technology, in particular to a method for treating high-concentration fluoride waste water in the fluorine chemical industry. 【Background technique】 [0002] Fluorine is one of the essential trace elements for the human body. When the fluorine content in drinking water is deficient, it is easy to suffer from dental caries. On the contrary, if you drink drinking water with a fluorine concentration higher than 1mg / L for a long time, it will cause dental fluorosis. It can also cause skeletal fluorosis. According to national standards: the fluoride ion concentration of industrial wastewater should be lower than 10mg / L, and the fluoride ion concentration of drinking water should be lower than 1mg / L. [0003] At present, the fluorine-containing sewage treatment methods used at home and abroad mainly include: calcium salt precipitation method, aluminum salt precipitation method, adsorption method and other method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/58C02F1/52
Inventor 谢鄂民叶刚章明华
Owner 浙江汉盛氟化学有限公司
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