Advanced treatment method of fluoride-containing wastewater

A technology for advanced treatment of waste water, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. To achieve the effect of enhanced coagulation effect, high fluorine removal efficiency and good adsorption effect

Active Publication Date: 2015-11-18
ANHUI JINYANG FLUORINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And technicians found in the adsorption research that laterite, activated carbon, fly ash, alumina, calcium hydroxyphosphate, rectorite, etc. all have a certain adsorption effect on fluoride ions, and these materials in the form of powder have a wide range of sources and low cost , easy to regenerate, large adsorption capacity and high efficiency, but because it is only suitable for low-concentration fluorine-containing wastewater, and the adsorbent is usually difficult to separate and

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  • Advanced treatment method of fluoride-containing wastewater

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Embodiment 1

[0036] A method for advanced treatment of fluorine-containing wastewater proposed in this embodiment comprises the following steps:

[0037] S1. Sedimentation: collect fluorine-containing wastewater, settle naturally for 5 hours, and send it to the regulating tank. Add calcium hydroxide slurry with a concentration of 15wt% to the regulating tank at a rate of 1.5m / min under stirring conditions, and control it in the regulating tank after mixing. The pH value is 4-6, and it is left to settle for 8 hours;

[0038] S2, flocculation: introduce the wastewater after the precipitation treatment in S1 into the reaction tank, add modified diatomite, wherein the preparation of the modified diatomite includes: adding water to the diatomite to obtain a pulp with a concentration of 20wt%, and Add 1.6wt% sodium hexametaphosphate and 0.4wt% sodium hydroxide based on diatomaceous earth, stir in a water bath at 50°C for 0.5h, let it stand for 0.6h, take the upper layer of mud and centrifuge, dr...

Embodiment 2

[0042] A method for advanced treatment of fluorine-containing wastewater proposed in this embodiment comprises the following steps:

[0043] S1. Sedimentation: collect fluorine-containing waste water, send it to the regulating tank after natural settlement for 8 hours, add calcium hydroxide slurry with a concentration of 20wt% to the regulating tank at a rate of 0.5m / min under stirring conditions, and control it in the regulating tank after mixing The pH value is 5-6, and it is left to settle for 6 hours;

[0044] S2, flocculation: introduce the wastewater after the precipitation treatment in S1 into the reaction tank, add modified diatomite, wherein the preparation of the modified diatomite includes: adding water to the diatomite to prepare a slurry with a concentration of 30wt%, and Add 1.2wt% sodium hexametaphosphate and 0.8wt% sodium hydroxide based on diatomaceous earth, stir in a water bath at 30°C for 1h, let stand for 0.3h, take the upper layer of mud and centrifuge, d...

Embodiment 3

[0048] A method for advanced treatment of fluorine-containing wastewater proposed in this embodiment comprises the following steps:

[0049] S1. Sedimentation: collect fluorine-containing waste water, send it to the regulating tank after natural sedimentation for 6 hours, add calcium hydroxide slurry with a concentration of 17wt% to the regulating tank at a rate of 1.0m / min under stirring conditions, and control it in the regulating tank after mixing The pH value is 4-6, and it is left to settle for 7 hours;

[0050] S2, flocculation: introduce the wastewater after the precipitation treatment in S1 into the reaction tank, add modified diatomite, wherein the preparation of the modified diatomite includes: adding water to the diatomite to prepare a pulp with a concentration of 25wt%, and Add 1.4wt% sodium hexametaphosphate and 0.6wt% sodium hydroxide based on diatomaceous earth, stir in a water bath at 40°C for 0.7h, let stand for 0.4h, take the upper layer of mud and centrifuge...

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Abstract

The invention discloses an advanced treatment method of fluoride-containing wastewater. The method comprises steps as follows: S1, precipitation: the fluoride-containing wastewater is collected and sent into an adjusting tank, calcium hydroxide slurry is added to the adjusting tank, the pH value of the adjusting tank is controlled to range from 4 to 6 after even mixing, and the mixture is left to stand for precipitation; S2, flocculation: the wastewater subjected to precipitation treatment is introduced into a reaction tank, a PAC and PAM combined flocculating agent is added, and the mixture is stirred and left to stand; S3, electrocoagulation: the wastewater subjected to flocculation treatment is introduced into an electrolytic bath, an electrolyte is added, electrocoagulation treatment is performed after energization, the mixture is left to stand, drained water enters a water outlet tank, a base is added, the pH is adjusted to range from 9 to 11, activated carbon powder is added, and the mixture is evenly stirred; S4, adsorption: the wastewater subjected to microfiltration treatment is introduced into an adsorption tank, the pH of the wastewater is adjusted to range from 4 to 6, a modification adsorbent is added, and the mixture is left to stand after being evenly mixed. With the adoption of the treatment technology, the content of fluoride in the wastewater is reduced to be lower than 1.0 mg/L, and the whole treatment technology is simple, mature, practical, economical and reasonable.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for advanced treatment of fluorine-containing wastewater. Background technique [0002] In recent years, my country's fluorine chemical industry has developed rapidly, and the overall fluorine chemical market is growing at a rate of 15-20%. In the future, the fluorine chemical industry will also be one of the fastest growing industries in the chemical industry. However, the environmental threat brought by the rapid development of the fluorine chemical industry has become the biggest obstacle to the sustainable development of the industry. On the one hand, due to the large amount of fluorine-containing wastewater produced in the manufacturing process of fluorine chemical products, it is easy to pollute water, soil and plants. On the other hand, because most of the fluorine element in wastewater treatment eventually enters into the sludge, the fluorine conten...

Claims

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Application Information

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IPC IPC(8): C02F9/06
Inventor 陈喜
Owner ANHUI JINYANG FLUORINE CHEM
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