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Method for treating initial fluorine-containing rainwater by adopting magnetic flocculation-adsorption

A technology for initial rainwater and adsorption treatment, applied in filtration treatment, sedimentation treatment, multi-stage water treatment, etc., can solve the problems of low exchange capacity and fluoride removal efficiency of ion exchange resin method, complicated electrodialysis method device, difficult to popularize, etc.

Inactive Publication Date: 2018-04-06
KUNMING ENG & RES INST OF NONFERROUS METALLURGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 has simple equipment and easy operation, the cost of water production is high, and the treatment effect on wastewater with high fluorine content is not good, so it is difficult to promote at present
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 initial fluorine-containing rainwater by adopting magnetic flocculation-adsorption
  • Method for treating initial fluorine-containing rainwater by adopting magnetic flocculation-adsorption

Examples

Experimental program
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Embodiment 1

[0024] Such as 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.

[0025] (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 magnetic powder at 0.02‰ of the initial rainwater quality containing fluorine (...

Embodiment 2

[0032] (1) Mixed reaction: Add lime milk to the initial rainwater containing fluoride to adjust the pH to 8, then add calcium chloride at 0.3‰ of the initial rainwater quality of fluorine, and add magnetic powder (magnetic powder at 0.02‰ of the initial rainwater quality of fluorine The particle size is 80-200 mesh), mixed for 20 minutes and then enters the coagulation tank;

[0033] (2) Coagulation: In the coagulation tank, add polyaluminum chloride according to 0.3‰ of the initial rainwater quality containing fluorine, and then add coagulant aid according to 0.05‰ of the initial rainwater quality containing fluorine, and coagulate for 20 minutes to obtain a mixed system;

[0034] (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.

[0035] (4) pH adjustment: put the upper water into the middle pool, and adjust the pH to 7 with hydrochloric acid or su...

Embodiment 3

[0039] (1) Mixed reaction: add lime milk to the initial fluorine-containing rainwater to adjust the pH to 7, then add calcium chloride at 1‰ of the initial fluorine-containing rainwater quality, and add magnetic powder at 0.03‰ of the initial fluorine-containing rainwater quality (the particle size of the magnetic powder is is 80-200 mesh), mixed for 60 minutes and then enters the coagulation tank;

[0040] (2) Coagulation: In the coagulation tank, add polyaluminum chloride according to 1‰ of the initial rainwater quality containing fluorine, and then add coagulation aid according to 0.1‰ of the initial rainwater quality containing fluorine, and coagulate for 60 minutes to obtain a mixed system;

[0041] (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.

[0042] (4) pH adjustment: put the upper water into the middle pool, and adjust the pH to 7 with hy...

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Abstract

The invention discloses a coagulating sedimentation-adsorption method for treating initial fluorine-containing rainwater. The method comprises the steps that lime milk is added to adjust the pH to alkaline, aluminum salt coagulant and coagulant aid are added after calcium chloride and magnetic powder are added to mixed with the lime milk, and the fluorine-containing rainwater filtered by a multi-medium filter and a second-level activated alumina filter can be reused or discharged after reactive precipitation. According to the method, a stable and high-efficient method for treating the initialfluorine-containing rainwater is provided to aim at the present situation that fluoride content in the initial rain water produced by enterprises using villiaumite exceeds a standard, which can not meet the demand of environmental protection. The method is suitable for occasions where the concentration of fluoride in the initial fluoride-containing water does not exceed 200 mg / L, and the fluorideconcentration in effluent can be controlled at 1 mg / L.

Description

technical field [0001] The invention relates to a method for treating initial fluorine-containing rainwater by using magnetic flocculation-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-clas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C02F101/14
CPCC02F1/001C02F1/281C02F1/488C02F1/5245C02F9/00C02F2001/007C02F2101/14C02F2103/001C02F2301/08
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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