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Photovoltaic fluorine-containing wastewater recycling method

A technology of recycling and wastewater, applied in chemical instruments and methods, calcium/strontium/barium fluoride, water pollutants, etc., can solve the problems of waste, residual lime residue, solid waste fluorine resources, etc.

Active Publication Date: 2021-07-06
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Photovoltaic fluorine-containing wastewater recycling method
  • Photovoltaic fluorine-containing wastewater recycling method
  • Photovoltaic fluorine-containing wastewater recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] S1: Configure the calcium chloride reaction solution for the reaction and treatment of photovoltaic fluorine-containing wastewater through the calcium chloride configuration tank, and wait for use; the preparation of the calcium chloride reaction solution is 74.5g / 100mL saturated calcium chloride solution;

[0045] S2: The calcium chloride reaction solution is added dropwise to the reaction pool in multiple points for mixed reaction with the photovoltaic fluorine-containing wastewater under acidic conditions of pH=1~2, and the dosage of the calcium chloride reaction solution is according to Ca:F=1: The molar ratio of 2 is added, and the stirring speed is 500rpm to obtain the reaction mixture; the calcium fluoride seed crystals accounting for 15g / L of photovoltaic fluorine-containing wastewater injection are also added in the calcium chloride reaction solution; by adding the above-mentioned dosage The strong agent can effectively promote the output of calcium fluoride pre...

Embodiment 2

[0048] This example is basically the same as Example 1, except that the stirring speed of the calcium chloride reaction liquid and photovoltaic fluorine-containing wastewater is different when they are mixed dropwise, specifically as follows: the stirring speed is 200 rpm.

Embodiment 3

[0050] This example is basically the same as Example 1, except that the stirring speed of the calcium chloride reaction liquid and photovoltaic fluorine-containing wastewater is different when they are mixed dropwise, specifically as follows: the stirring speed is 1000 rpm.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C01F11/22C02F101/14C02F103/34
CPCC02F1/583C01F11/22C02F2101/14C02F2001/007C02F2103/34
Inventor 吕路莫思琦王林平徐敬生张炜铭潘丙才
Owner NANJING UNIV
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