A method for advanced treatment of fluorine-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: 2017-07-07
ANHUI JINYANG FLUORINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 regenerate, its application is limited
[0005] Therefore, considering the practical operability and economic factors, it is urgent to develop an efficient and advanced method for the treatment of fluorine-containing wastewater for the treatment of industrial wastewater whose main goal is to meet the standard discharge, so as to overcome the substandard, For problems such as large waste of production costs, these are of great significance for the treatment of fluorine-containing wastewater

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  • A method for advanced treatment of fluorine-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 a method for advanced treatment of fluorine-containing wastewater, comprising the following steps: S1. Precipitation: collecting fluorine-containing wastewater and sending it to a regulating tank, adding calcium hydroxide slurry to the regulating tank, and controlling the pH in the regulating tank after mixing The value is 4‑6, settling down; S2, flocculation: introduce the wastewater treated by sedimentation into the reaction tank, add the combined flocculant of PAC and PAM, stir, and let stand; S3, electrocoagulation: put the wastewater after flocculation treatment Introduce the waste water into the electrolytic cell, add electrolyte, energize for electrocoagulation treatment, let stand, drain into the effluent pool, add alkali to adjust the pH to 9‑11, add activated carbon powder and stir evenly; S4, adsorption: the microfiltration treated After the wastewater is introduced into the adsorption pool, adjust the pH of the wastewater to 4-6, add a modified adsorbent, mix well and let stand. The treatment process of the invention not only reduces the fluorine content in the waste water to below 1.0 mg / L, but also the whole treatment process is simple, mature, practical and 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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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06
Inventor 陈喜
Owner ANHUI JINYANG FLUORINE CHEM
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