Method for treating fluorine-containing initial rainwater through coagulating sedimentation-adsorption

A technology for initial rainwater and adsorption treatment, applied in sedimentation treatment, flocculation/sedimentation water/sewage treatment, filtration treatment, etc., can solve the problem of high power consumption, low exchange capacity of ion exchange resin method and low fluorine removal efficiency, and water production cost. higher question

Inactive Publication Date: 2018-02-09
KUNMING ENG & RES INST OF NONFERROUS METALLURGY +2
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The reverse osmosis method requires complex pretreatment, the reverse osmosis method equipment is expensive, and the power consumption is also large
Although the electrocoagulation method is simple in equipment and easy to operate, the cost of water production is high, and the treatment effect on wastewater with high fluorine content is not good, so it is currently difficult to promote
The ion exchange resin method has low exchange capacity and fluorine removal efficiency, and the resin is expensive and the regeneration cost is high, so there is no industrialized example
The electrodialysis device is complicated, consumes a lot of power, maintains high intensity, and has strict technical requirements for operators, and if there are high-priced metal ions in the water, it is easy to cause membrane poisoning and damage the electrodes.

Method used

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  • Method for treating fluorine-containing initial rainwater through coagulating sedimentation-adsorption
  • Method for treating fluorine-containing initial rainwater through coagulating sedimentation-adsorption

Examples

Experimental program
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Embodiment 1

[0025] like figure 1 , The processing equipment includes a mixed reaction tank, a coagulation tank, a sedimentation tank, an intermediate tank, a multimedia filter, a primary activated alumina filter, and a secondary activated alumina filter connected in sequence. The intermediate pool is provided with a lifting pump, and the water pump is connected with the water inlet of the multimedia filter through a pipeline. The sedimentation tank is equipped with a sludge return pump to return the bottom sludge of the sedimentation tank to the mixing reaction tank, and the other part of the sludge is pressurized by the sludge pump to the sludge dewatering equipment for dehydration and then shipped out.

[0026] (1) Mixed reaction: Add lime milk to the initial rainwater containing fluoride to adjust the pH to 9, then add calcium chloride at 0.2‰ of the initial rainwater quality containing fluoride, and add alumina powder (oxidized The particle size of the aluminum powder is 80-300 mesh)...

Embodiment 2

[0033] (1) Mixed reaction: Add milk of lime to the initial rainwater containing fluoride to adjust the pH to 8, then add calcium chloride at 0.3‰ of the initial rainwater containing fluoride, and add alumina powder (oxidized The particle size of the aluminum powder is 80-300 mesh), mixed for 20 minutes and then enters the coagulation tank;

[0034] (2) Coagulation: In the coagulation tank, add polyaluminum chloride according to 0.3‰ of the initial rainwater quality containing fluorine, and then add polyacrylamide according to 0.05‰ of the initial rainwater quality containing fluorine, and coagulate for 20 minutes to obtain a mixed system;

[0035] (3) Sedimentation: Use inclined plate or cooperative sedimentation tank to settle the mixed system for 60 minutes, and take the upper layer water; the sludge return ratio is 1:1.

[0036] (4) pH adjustment: put the upper water into the middle pool, and adjust the pH to 7 with hydrochloric acid or sulfuric acid;

[0037] (5) Filtrati...

Embodiment 3

[0040] (1) Mixed reaction: Add lime milk to the initial rainwater containing fluoride to adjust the pH to 7, then add calcium chloride at 1‰ of the initial rainwater mass containing fluoride, and add alumina powder (oxidized The particle size of the aluminum powder is 80-300 mesh), mixed for 60 minutes and then enters the coagulation tank;

[0041](2) Coagulation: In the coagulation tank, add polyaluminum chloride according to 1‰ of the initial fluorine-containing rainwater quality, and then add polyacrylamide according to 0.1‰ of the initial fluorine-containing rainwater quality, and coagulate for 60 minutes to obtain a mixed system;

[0042] (3) Sedimentation: Use inclined plate or cooperative sedimentation tank to settle the mixed system for 60 minutes, and take the upper layer water; the sludge reflux ratio is 5:1.

[0043] (4) pH adjustment: put the upper water into the middle pool, and adjust the pH to 7 with hydrochloric acid or sulfuric acid;

[0044] (5) Filtration: ...

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Abstract

The invention discloses a method for treating fluorine-containing initial rainwater through coagulating sedimentation-adsorption. Lime milk is added to adjust the pH to be alkaline, calcium chloride and aluminum oxide powder are added and mixed, an aluminum salt coagulant and a coagulant aid are added, and reaction precipitates can be reused or discharged after being filtered by a multi-media filter and a secondary activated aluminum oxide filter. The invention provides the stable and efficient method for treating the fluorine-containing initial rainwater to eliminate the current situation that the content of a large quantity of initial rainwater fluorides produced in initial rainwater produced by fluorine salt using enterprises exceeds the standard and the environmental protection requirement cannot be met. The method is applied to occasions with the fluorine-containing initial rainwater fluoride concentration not exceeding 200 mg / L, and the effluent fluoride concentration can be controlled at 1 mg / L.

Description

technical field [0001] The invention relates to a method for treating initial fluorine-containing rainwater by coagulation, sedimentation and adsorption, and belongs to the technical field of sewage treatment. Background technique [0002] Fluorine in nature is in a compound state, mainly including: fluorite, fluoroapatite, cryolite and so on. They are all important chemical raw materials, widely used in aluminum electrolysis, steel, cement, bricks, ceramics, phosphate fertilizers, glass, semiconductors, pharmaceuticals and other industrial production. The common feature of these industries is that fluorine-containing minerals are used as the main raw material or auxiliary raw materials. During the smelting and production process, fluorine decomposes from the minerals and enters the environment, causing fluorine pollution. The outstanding performance is that the fluorine content in the initial rainwater of these industries exceeds the standard. The fluorine ion is a first-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/14
CPCC02F1/001C02F1/281C02F1/5236C02F1/56C02F1/66C02F9/00C02F2001/007C02F2101/14C02F2103/001
Inventor 余仲勋谢朝晖杨虎徐启浩乔忠宇万多稳刘家文李嵘向金鑫徐明李二双朱树文杨仕勇
Owner KUNMING ENG & RES INST OF NONFERROUS METALLURGY
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