A method of lime-fly ash joint treatment of high-concentration fluorine-containing wastewater

A combined treatment and fly ash technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems that the effluent is difficult to meet the national discharge standard and the treatment cost is high

Inactive Publication Date: 2011-12-07
NORTHWEST A & F UNIV +1
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Problems solved by technology

A single treatment method for low-concentration fluorine-containing wastewater has a better treatment effect, but for high-concen...

Method used

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with specific embodiments.

[0016] This scheme is applicable to the treatment of inorganic fluoride ions in wastewater from fly ash, the main solid waste discharged from coal-fired power plants. Firstly, the fly ash samples were modified by wet preparation scheme.

[0017] Take 1kg of fly ash modified by 1mol / L hydrochloric acid as an example. Fly ash should be air-dried and passed through a 0.15mm sieve before preparation. Weigh 1 kg of fly ash, add 1 L of hydrochloric acid with a concentration of 1mol / L to soak and modify it, stir continuously for 5 hours, stop stirring, let the fly ash settle completely, pour off the supernatant, and then use deionized water Rinse, vacuum filter until dry, then transfer the fly ash sample to a white porcelain plate, dry it at 80-105°C, completely dry it through a 0.15mm sieve, and bottle it to obtain modified fly ash.

[0018] Lime primary precipitation treatm...

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Abstract

The invention discloses a lime-fly ash joint treatment method for high-concentration fluorine-containing wastewater, which comprises the following steps: lime primary precipitation treatment stage: the temperature is 10°C, the amount of lime added is 0.1-0.2g per 50mL of fluorine-containing wastewater, Adsorption time is 30-60min, pH is 5.0-8.0; fly ash secondary adsorption treatment stage: temperature is 15°C-45°C, fly ash addition is 5.0-15.0g per 50mL fluorine-containing wastewater, adsorption time is 60- 120 minutes, pH is 5.0-7.0, and the fly ash has been modified by acid solution in advance. The modified fly ash is used for industrial wastewater treatment to improve the utilization rate and effect of the fly ash, and the fly ash is a renewable material, which can be recycled through pickling and other processes.

Description

technical field [0001] The invention relates to a lime-fly ash joint treatment method for high-concentration fluorine-containing wastewater, which belongs to the technical field of industrial wastewater treatment. Background technique [0002] With the development of industry and agriculture, industries such as mining and processing of fluorine-containing ores, metal smelting, aluminum electrolysis, coke, glass, electronics, electroplating, chemical fertilizers, and chemicals have fluorine-containing wastewater discharged during production. The random discharge of high-fluorine wastewater will cause pollution of groundwater, soil, atmosphere and food chain, and pose a threat to human health and the quality of the ecological environment. If fluorine-containing wastewater is discharged directly without treatment, it will seriously pollute the water environment and harm the human body through the food chain. [0003] At present, the treatment methods of fluorine-containing wat...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F1/28
Inventor 孟昭福马云飞李立邓晶
Owner NORTHWEST A & F UNIV
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