A sewage treatment system and sewage treatment method for high-precision defluorination

A sewage treatment method, high-precision technology, applied in the direction of water/sewage treatment, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc. Stable up to the standard, high cost of activated alumina filter material, etc., to achieve stable fluoride removal effect, reduce infrastructure investment costs, and simple structure

Active Publication Date: 2022-07-19
北京翰祺环境技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preliminary treatment by calcium salt precipitation method can treat fluoride in wastewater to about 20 mg / L. Due to the solubility of calcium fluoride itself and the effect of the same ion effect, it is difficult to treat fluoride to a lower level by this method
The deep defluorination treatment generally adopts activated alumina adsorption. After the activated alumina absorbs fluoride saturated, it needs to be desorbed and regenerated, and the desorbed fluoride still needs additional treatment, which makes the whole treatment process lengthy and complicated.
At the same time, after repeated adsorption and desorption, the ability of activated alumina to absorb fluoride is continuously reduced, resulting in the fluoride content in the treated effluent cannot be stably up to the standard, and the cost of replacing activated alumina filter material is high

Method used

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  • A sewage treatment system and sewage treatment method for high-precision defluorination
  • A sewage treatment system and sewage treatment method for high-precision defluorination

Examples

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Effect test

Embodiment 1

[0050] In this example, a coal chemical treatment project in a city in Shanxi is taken as an example. The scale of the sewage to be treated in this project is 200 m 3 / h, the fluoride content in the designed discharge water is not more than 1.5mg / L.

[0051] The sewage treatment method of the present embodiment adopts the above-mentioned high-precision defluorination sewage treatment system, including the following steps:

[0052] Turn on the booster pump 1 to pressurize the fluorine-containing sewage entering the booster pump 1 to a water pressure of 1MPa, and the pressurized sewage enters the first pipeline mixer 2, and passes through the first chemical dosing line 22 to the first pipeline mixer. Add the first agent polyaluminum chloride in 2, the polyaluminum chloride is added in the form of polyaluminum chloride aqueous solution, and the mass fraction (in Al 2 O 3 ) is 10%, and the dosage is 10.2 mL / L, that is, 10.2 mL of aqueous polyaluminum chloride solution is added t...

Embodiment 2

[0058] In this example, a coal chemical treatment project in a city in Shanxi is taken as an example. The scale of the sewage to be treated in this project is 200 m 3 / h, the fluoride content of the designed discharge water is not more than 1.5mg / L.

[0059] The sewage treatment method of this embodiment refers to Example 1, wherein the dosage of the first chemical is 5.0 mL / L, the dosage of the second chemical is 0.8 mL / L, and the dosage of the third chemical is 0.8 mL / L L, the dosage of the fourth medicament ensures that the concentration of the fourth medicament in the fourth pipeline mixer 5 is 30 mg / L, and the others are the same as those in Example 1.

Embodiment 3

[0061] In this example, a coal chemical treatment project in a city in Shanxi is taken as an example. The scale of the sewage to be treated in this project is 200 m 3 / h, the fluoride content of the designed discharge water is not more than 1.5mg / L.

[0062]The sewage treatment method of this embodiment refers to Example 1, wherein the dosage of the first chemical is 3.2 mL / L, the dosage of the second chemical is 0.8 mL / L, and the dosage of the third chemical is 0.5 mL / L L, the dosage of the fourth medicament ensures that the concentration of the fourth medicament in the fourth pipeline mixer 5 is 30 mg / L, and the others are the same as those in Example 1.

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Abstract

The invention discloses a sewage treatment system and a sewage treatment method for high-precision defluorination, belonging to the technical field of sewage treatment. The sewage treatment system for high-precision defluorination of the present invention includes a pipeline mixing unit and a sedimentation treatment unit arranged in sequence along the water flow direction, and the pipeline mixing unit includes a first pipeline mixer and a second pipeline mixer connected in sequence for adjusting pH value The third pipeline mixer and the fourth pipeline mixer; the sedimentation treatment unit is any one of a high-efficiency sedimentation tank, a sand-added sedimentation tank, and a circulating clarification tank; the sedimentation treatment unit includes a flocculation tank and a sedimentation tank. The water inlet is connected with the water outlet of the pipeline mixing unit, and the water outlet of the flocculation tank is connected with the water inlet of the sedimentation tank. The high-precision fluorine-removing sewage treatment system of the invention can greatly reduce the fluorine content in the sewage, meet the discharge standard, and has high sedimentation speed and high treatment efficiency.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, and more particularly, to a sewage treatment system and a sewage treatment method for high-precision defluorination. Background technique [0002] With the rapid development of my country's industry, the discharge of various industrial wastewater is also increasing. Among them, fluorine-containing industrial wastewater will pose a serious threat to people's health, so the country's requirements for the discharge of fluorine-containing wastewater are becoming more and more strict. As stipulated in the "Integrated Wastewater Discharge Standard" (GB8789-88), the newly expanded enterprises discharge fluoride-containing wastewater, and the fluoride content in the wastewater shall not exceed 10mg / L; another example is "Surface Water Environmental Quality Standard" (GB3838-2002) It stipulates that the maximum allowable content of fluoride in the surface class IV and V water is 1.5mg / L (in F -...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/14
CPCC02F9/00C02F1/5245C02F1/5281C02F1/52C02F1/583C02F1/66C02F2201/002C02F2301/066C02F2303/14C02F2301/046C02F2209/06
Inventor 王晓阳汪德罡谢晓朋
Owner 北京翰祺环境技术股份有限公司
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