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Treatment method of fluorine-containing wastewater

A treatment method and wastewater technology, applied in water/sewage treatment, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc., can solve the problems of not being fully utilized, low solubility, large dosage, etc.

Inactive Publication Date: 2019-03-22
FOSHAN COMWIN LIGHT & ELECTRICITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The price of lime is cheap, but its solubility is low, so it can only be added in emulsion, because the produced CaF 2 Precipitate wrapped in Ca(OH) 2 The surface of the particles prevents them from being fully utilized, so the dosage is large

Method used

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  • Treatment method of fluorine-containing wastewater
  • Treatment method of fluorine-containing wastewater

Examples

Experimental program
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Effect test

Embodiment 1 to 9

[0020] Embodiments 1 to 9 process fluorine-containing wastewater according to the following steps:

[0021] Step A, collecting fluorine-containing wastewater as raw water, adding lime aqueous solution to the raw water until the pH value is adjusted to 8-9, and reacting for 20 minutes;

[0022] Step B, add alum to the mixed solution in step A, the amount of alum solution added is as shown in Table 1, and adjust the pH value to 10-11, and react for 5 minutes;

[0023] Step C, adding a polyacrylamide solution with a concentration of 15 ppm to the mixed solution in step B, and reacting for 5 minutes;

[0024] In step D, the mixed solution in step C is left to stand for 5 minutes, and then solid-liquid separation is performed, and the separated supernatant is treated wastewater.

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PUM

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Abstract

The invention discloses a treatment method of fluorine-containing wastewater. The treatment method comprises the following steps: A, collecting the fluorine-containing wastewater as raw water, addinga lime water solution into the raw water until the pH value is adjusted to be 8-9, and reacting for 20 minutes; B, adding alum into a mixed solution in the step A according to the addition amount of 0.3-0.4g of the alum per liter of the raw water, adjusting the pH value to 10-11, and reacting for 5min; C, adding 10-20ppm of a polyacrylamide solution into a mixed solution in the step B, and reacting for 5min. The fluoride ion concentration of a supernatant is lower than 5mg / L, the national industrial wastewater discharge standard is met, the sedimentation speed is high, and the defluoridation rate is high.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a treatment method for fluorine-containing waste water. Background technique [0002] Fluorine is one of the essential trace elements for the human body, and the appropriate concentration of fluorine in drinking water is 0.5-1mg / L. When the fluorine content in drinking water is insufficient, it is easy to suffer from dental caries; but if drinking water with a fluorine concentration higher than 1mg / L for a long time, it will cause dental fluorosis; long-term drinking water with a fluorine concentration of 3-6mg / L Can cause skeletal fluorosis. Fluoride-containing groundwater is widely distributed in my country, especially in the arid regions of Northwest China. About 70 million people drink water with excessive fluoride content, leading to varying degrees of fluorosis. According to the national industrial wastewater discharge standard, the fluoride ion concentration should b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/14
CPCC02F1/5236C02F1/56C02F1/66C02F2101/14
Inventor 苏荣欢潘杏仪何志明
Owner FOSHAN COMWIN LIGHT & ELECTRICITY
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