Method for removing fluorine and hardness of industrial wastewater

A technology for industrial wastewater and hardness, applied in water softening, chemical instruments and methods, water pollutants, etc., can solve problems such as ineffective chemical reactions, unfavorable standardized disposal, and failure to consider resource utilization.

Pending Publication Date: 2021-05-18
关向辉
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing industrial wastewater treatment methods, the effect of chemical reaction is not obvious, the overall treatment timeliness is poor, conventional disposal equipment cannot be used, and the disposal efficiency is low. For example, when the existing wastewater treatment method removes fluoride, calcium ion components are usually added , because the reaction to remove it is an excessive reaction, and the excessive addition of calcium ions will affect the difficulty of its calcium removal, so a chain reaction is formed, the removal rate is not ideal, and it cannot be directly filtered, it needs phase separation to achieve the effect, very It greatly affects the efficiency of wastewater treatment
In addition, the existing industrial wastewater treatment methods are not conducive to standardized disposal, affecting practical applications, and do not consider the problem of resource treatment and utilization, which needs to be solved urgently

Method used

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  • Method for removing fluorine and hardness of industrial wastewater
  • Method for removing fluorine and hardness of industrial wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0027] This embodiment provides a method for removing fluoride and hardness from industrial wastewater, comprising the following steps:

[0028] (1) After fully mixing the fluorine-containing and calcium-containing industrial wastewater, pump it into the reactor for 7 tons. The water quality test results show that the fluoride ion is 2203mg / L, the calcium ion is 1965mg / L, the magnesium ion is 432mg / L, and the COD is 964mg. / L, ammonia nitrogen is 2654mg / L. Add phosphoric acid to the waste water under stirring for acidification, adjust the pH to 3.5, and after stirring for 60 minutes, a large amount of precipitation occurs;

[0029] (2) After adding 800kg of water to the reaction kettle for dilution, slowly add magnesium carbonate under stirring, adjust the pH to 7.6, and continue stirring for 2 hours. During the period, it is found that the sedimentation is large, continue to add 400kg of water, and check the pH value after the stirring is completed. correct;

[0030] (3) Th...

Embodiment 2

[0033] This embodiment provides a method for removing fluoride and hardness from industrial wastewater, comprising the following steps:

[0034] (1) After fully mixing the fluorine-containing and calcium-containing industrial wastewater, pump it into the reactor for 7 tons. The water quality test results show that the fluoride ion is 426mg / L, the calcium ion is 402mg / L, the magnesium ion is 175mg / L, and the COD is 506mg. / L, ammonia nitrogen is 782mg / L. Add phosphoric acid to the wastewater under stirring for acidification, adjust the pH to 3.5, and after stirring for 60 minutes, a small amount of precipitation occurs;

[0035] (2) Slowly add magnesium hydroxide to the reaction kettle under stirring, adjust the pH to 7.9, continue to stir for 2h, during which it is found that the sedimentation is relatively large, add 300kg of water, and the pH value is correct after the stirring is finished;

[0036] (3) The waste water obtained in step (2) enters a filter press for press fi...

Embodiment 3

[0039] This embodiment provides a method for removing fluoride and hardness from industrial wastewater, comprising the following steps:

[0040] (1) After fully mixing the fluorine-containing and calcium-containing industrial wastewater, pump it into the reactor for 7 tons. The water quality test results show that the fluoride ion is 219mg / L, the calcium ion is 321mg / L, the magnesium ion is 83mg / L, and the COD is 502mg. / L, ammonia nitrogen is 553mg / L. Add phosphoric acid to the wastewater under stirring for acidification, adjust the pH to 3.5, and after stirring for 60 minutes, a small amount of precipitation occurs;

[0041] (2) Slowly add magnesium oxide to the reaction kettle under stirring, adjust the pH to 7.2, continue to stir for 2 hours, during which it is found that the sedimentation is relatively large, add 200kg of water, and check that the pH value is correct after the stirring is completed;

[0042] (3) The waste water obtained in step (2) enters a filter press ...

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Abstract

The invention relates to a method for removing fluorine and hardness of industrial wastewater. The method comprises the following steps: (1) adding a calcium precipitant into the industrial wastewater, and stirring to completely precipitate; (2) adding a defluorination agent into the mixture obtained in the step (1) while stirring, and stirring to completely precipitate; and (3) carrying out solid-liquid separation on the wastewater obtained in the step (2), and treating the obtained liquid part through a sewage biochemical treatment system. Compared with a traditional treatment method, the method for removing fluorine and hardness of the industrial wastewater has the advantages that the wastewater treatment efficiency is greatly improved, fluorine ions and calcium and magnesium ions in the wastewater are more thoroughly removed, pollutants such as total phosphorus, total nitrogen, chroma, suspended matters and heavy metal ions in the wastewater can be effectively removed, especially, the effect of removing and degrading COD and ammonia nitrogen is obvious, a recycled salt filter cake can be formed and used as a raw material of other industries, and good economic benefits and values are achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for removing fluoride and hardness from industrial wastewater. Background technique [0002] With the rapid development of my country's industrialization level, every year we will produce a large amount of industrial wastewater containing fluorine-containing waste acid, fluorine-containing waste liquid, fluorine-containing calcium and so on. The difficulty is both a challenge and an opportunity for our hazardous waste disposal enterprises and the entire industry. How to dispose of them efficiently and reasonably will determine the fate of the enterprise and lead the development direction of the industry. [0003] In the existing industrial wastewater treatment methods, the effect of chemical reaction is not obvious, the overall treatment timeliness is poor, conventional disposal equipment cannot be used, and the disposal efficiency is low. For example...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F3/30C02F1/44C02F1/58C02F5/04C02F101/10
CPCC02F9/00C02F1/52C02F3/30C02F1/442C02F1/444C02F1/58C02F5/04C02F1/5236C02F1/583C02F2101/10
Inventor 关向辉
Owner 关向辉
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