Photovoltaic fluorine-containing wastewater recycling method

Abstract

The invention discloses a photovoltaic fluorine-containing wastewater recycling method which comprises the following steps of: S1, preparing a saturated calcium chloride reaction solution through a calcium chloride preparation tank for later use; S2, adding fluorine-containing wastewater and the calcium chloride reaction solution into a reaction tank, and carrying out a mixed reaction to obtain a reaction mixed solution; and S3, introducing the reaction mixed solution into a sedimentation tank for sedimentation, and discharging supernatant in an overflow mode to obtain treated photovoltaic fluorine-containing wastewater and calcium fluoride capable of being recycled. A device comprises a calcium chloride preparation tank, a reaction tank and a sedimentation tank which are sequentially connected, a stirring assembly capable of improving the stirring efficiency is arranged in the middle in the reaction tank, and a liquid distribution assembly capable of preventing and clearing blockage is further arranged on the upper portion in the reaction tank. The photovoltaic fluorine-containing wastewater recycling method and device provided by the invention can realize efficient removal of fluorine and up-to-standard emission under an acidic condition, can also recover high-purity calcium fluoride capable of replacing fluorite, and have a good application prospect.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment and resource utilization, in particular to a method for resource utilization of photovoltaic fluorine-containing wastewater. Background technique [0002] In the photovoltaic industry related to the production of solar cells, solar modules, solar cells and module manufacturing, the production process will inevitably produce fluorine-containing wastewater with strong acidity (pH=1-2) and high fluorine content (4000-15000mg / L) , This type of wastewater is highly toxic and harmful. Therefore, effective treatment of such wastewater is of great significance to promote the green and sustainable development of the photovoltaic industry. [0003] At present, the most common method for the treatment of acidic high-fluorine industrial wastewater is calcium salt precipitation (slaked lime or milk of lime). However, this method also has a series of problems such as a large amount of lime residu...

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Problems solved by technology

However, this method also has a series of problems such as a large amount of lime residue remaining after precipitation, which is mixed with the generated calcium fluoride sludge and discarded, resulting in a large amount of solid waste and waste of fluorine resources.

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