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Method and device for removing fluorides in wastewater step by step

A technology of fluoride and waste water, which is applied in descaling and water softening, chemical instruments and methods, water pollutants, etc. It can solve the problems of difficulty in reaching water standards, difficulty in sludge sedimentation, and low efficiency, and reduce the dosage of chemicals , low operating cost, and the effect of improving the sludge structure

Pending Publication Date: 2018-08-17
北京翰祺环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problems of the present stage of defluoridation of industrial wastewater, such as difficulty in effluent compliance, difficulty in sludge precipitation, high cost, and low efficiency, and provides an anti-shock load performance, high system stability, flexible process adjustment, and easy operation. Low-cost high-concentration fluorine-containing wastewater process combination defluoridation method

Method used

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  • Method and device for removing fluorides in wastewater step by step
  • Method and device for removing fluorides in wastewater step by step
  • Method and device for removing fluorides in wastewater step by step

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Fluorine content test after primary treatment and secondary advanced treatment

[0034] The coal gasification water of a sewage treatment plant in Shanxi is 1920 tons per day, and the water intake indicators are shown in Table 1:

[0035] Table 1 Water quality of coal gasification water

[0036]

[0037] Sewage is divided into two parts: primary treatment and secondary advanced treatment.

[0038] The primary treatment is as follows: lime dosing tank, PH adjustment tank, coagulation tank, high-density integrated reaction tank 1.

[0039] The wastewater first passes through the lime dosing tank, and the excess lime is added to react with the fluoride ions in the wastewater to form CaF 2 precipitation.

[0040] The specific equation involved is: Ca 2+ +2F - →CaF 2 ↓

[0041] The PH adjustment tank uses concentrated sulfuric acid to adjust the effluent from the lime dosing tank, and the pH value is adjusted to 8.4. With the formation of calcium sulfate...

Embodiment 2

[0052] Embodiment 2: comparison of reflux in primary treatment

[0053] For coal gasification water of a sewage treatment plant in Xi'an, the influent indicators are shown in Table 3:

[0054] Table 3 Influent water quality of coal gasification water

[0055]

[0056] The dosage of lime is the same, both are 560mg / l, and the fluorine content of the primary effluent is shown in Table 4 when the reflux ratio is different:

[0057] Fluorine content under different reflux ratios in table 4

[0058]

[0059] When the reflux is not set, the amount of lime required to achieve the reflux value in the above table is shown in Table 5:

[0060] Lime consumption under different reflux ratios in table 5

[0061]

[0062] Conclusion: 1. The comparison shows that the effect of water discharge without backflow is obviously worse than that with backflow;

[0063] 2. When the reflux ratio is above 10%, the effluent effect basically does not change much. When it exceeds 25%, the flu...

Embodiment 3

[0065] Example 3: Contrast with or without softening and hard removal in the secondary advanced treatment

[0066] The influent indicators of coal gasification water in a sewage treatment plant in Guangxi are shown in Table 6:

[0067] Table 6 Influent water quality of coal gasification water

[0068]

[0069] The fluorine content of the water in and out of the softening and dehardening pool is shown in Table 7:

[0070] Table 7 Fluorine content of water quality in and out of water

[0071]

[0072] Conclusion: During the hard removal process of the softening pool, the calcium carbonate precipitate formed and the CaF formed 2 , Complex complexes are adsorbed together, which enhances the effect of fluorine removal.

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Abstract

The invention relates to a method and a device for removing fluorides in wastewater step by step and aims at solving the technical problems of difficulty in reaching standard of effluent and in sludgesedimentation, high cost and low efficiency. The method comprises the following steps of (1) sequentially performing lime feeding, pH value regulation, coagulation and first high-density integrationreaction on the wastewater to perform primary treatment on the fluorides in the wastewater; and (2) sequentially performing hardness removal by softening and second high-density integration reaction on the wastewater treated in the step (1) to perform secondary deep treatment on the fluorides in the wastewater. The method and the device can be widely applied to the field of fluoride removal of industrial wastewater.

Description

technical field [0001] The invention relates to the field of fluorine-containing wastewater treatment, in particular to a method and a device for removing fluoride in wastewater step by step. Background technique [0002] When the fluoride content in drinking water exceeds 1.5mg / L, it will be harmful to the human body and may lead to bone fluorosis. With the rapid development of modern industry, the output of industrial fluorine-containing wastewater is also increasing, and it is necessary to strictly control the discharge of fluoride-containing wastewater. In recent years, there has been a lot of research on the defluorination process of industrial wastewater at home and abroad. [0003] At present, the main treatment methods of fluorine-containing wastewater are chemical precipitation and adsorption. Generally, after the traditional precipitation method is treated with lime, the fluorine content in the water will still be 20-30mg / l, because the produced calcium fluoride i...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/14
CPCC02F9/00C02F1/28C02F1/56C02F1/52C02F1/66C02F5/06C02F5/00C02F2001/007C02F2101/14C02F2301/08C02F2301/04
Inventor 王晓阳盛雪芹巨春燕谢晓朋郝瀚
Owner 北京翰祺环境技术有限公司
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