Method for treating fluorine-containing wastewater of photovoltaic enterprise

A treatment method and wastewater technology, which is applied in energy wastewater treatment, water/sewage multi-stage treatment, biological water/sewage treatment, etc., can solve the problems of incomplete fluorine removal and large consumption of chemicals, etc.

Pending Publication Date: 2022-06-03
CHENGDU UNIV
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  • Claims
  • Application Information

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Problems solved by technology

If the chemical precipitation method is used to remove fluoride, it not only needs...

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  • Method for treating fluorine-containing wastewater of photovoltaic enterprise
  • Method for treating fluorine-containing wastewater of photovoltaic enterprise
  • Method for treating fluorine-containing wastewater of photovoltaic enterprise

Examples

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Embodiment 1

[0043]This example treats fluorine-containing wastewater located in a photovoltaic industrial park in Chengdu, and the designed daily water treatment capacity is 12,500 m 3 , for 24h continuous operation, mainly to deal with the waste water generated by the workshop's texturing, etching, SCRUBBER and other production processes and the washing water of the waste gas absorption tower. The solar crystalline silicon cell production wastewater in the photovoltaic industrial park is treated by the wastewater treatment station to meet the corresponding discharge standards, and then discharged into the municipal pipe network system. The processing steps are as follows:

[0044] (1) Physical and chemical treatment: use the corresponding waste liquid collection tank to collect the concentrated alkali waste liquid, mixed acid waste liquid, concentrated fluorine waste water, dilute alkali waste water and dilute fluorine waste water produced in the production workshop (the treated water vo...

Embodiment 2

[0073] Source of calcium sulfate sludge:

[0074] Sulfuric acid is an important basic chemical raw material and is widely used in metallurgy, iron and steel, titanium dioxide and other fields. However, during the application process, sulfuric acid-containing wastewater will be produced, which will seriously pollute the environment and seriously endanger biological growth and human life. Therefore, it must be treated to meet the standards before it can be discharged. At present, the treatment method of waste acid at home and abroad mostly adopts the neutralization method. The medicines used are generally lime, calcium hydroxide, etc. The main principle is the SO in the waste water. 4 2- and Ca in dosing drugs + The reaction produces CaSO 4 Precipitation, so as to adjust the acidity of the wastewater, the pH of the treated wastewater needs to reach about 7 before it can be discharged. A large amount of chemicals are used in the neutralization treatment stage, so a large amou...

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Abstract

The invention discloses a treatment method of fluorine-containing wastewater of a photovoltaic enterprise, and belongs to the technical field of fluorine-containing wastewater treatment. The treatment method comprises physicochemical treatment and biochemical treatment. Wherein in the physicochemical treatment stage, calcium sulfate sludge is mainly used for removing fluorine in the high-concentration fluorine-containing wastewater, and then a fluorine removal agent, a coagulant and a flocculating agent are used for further removing fluorine ions in the fluorine-containing wastewater of the photovoltaic enterprise; and through a biochemical treatment process of ammoniation, nitrification and denitrification of microorganisms, the purpose of removing total nitrogen in the fluorine-containing wastewater is achieved. According to the method, common industrial waste calcium sulfate sludge is adopted to remove fluorine, so that the operation cost of photovoltaic enterprises can be greatly reduced, the economic profit obtained by the photovoltaic enterprises is improved, the cyclic utilization of waste is realized, the purpose of treating waste with waste is achieved, and the method has relatively good social benefits, environmental benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of fluorine-containing wastewater treatment, in particular to a method for treating fluorine-containing wastewater from photovoltaic enterprises. Background technique [0002] The production process of solar crystalline silicon cells mainly includes texturing, phosphorus diffusion, etching, printing and other processes. Since a large number of chemicals such as nitric acid and hydrofluoric acid are used in the production process, the main pollutants in the generated wastewater are fluoride ions. , total nitrogen, ammonia nitrogen, etc.; its high fluoride ion concentration and strong corrosiveness are a major difficulty in wastewater treatment in the photovoltaic industry. [0003] At present, the common treatment methods for fluorine-containing wastewater in photovoltaic enterprises mainly include chemical precipitation, coagulation precipitation, adsorption, electrodialysis, electrocoagulation, reverse osmo...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/12C02F101/14
CPCC02F9/00C02F1/66C02F2001/007C02F1/52C02F2101/14C02F3/302C02F2101/12Y02W10/37
Inventor 黄正文童华美朱晏霞张宁曾丽
Owner CHENGDU UNIV
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