Solar cell monocrystal wool making fluorine-containing wastewater deep treatment technology

Abstract

The invention relates to the field of environmental protection and specifically relates to a solar cell monocrystal wool making fluorine-containing wastewater deep treatment technology. By means of the deep treatment technology, the maximum fluorine waste treatment can be achieved under the situations of defluorinating reactant feeding is standard and minimum, and a national secondary effluent standard can be met. The deep treatment technology comprises the steps: step 1, desalting treatment: guiding lime water into each batch of high-concentration fluorine-containing wastewater with the fluorine-containing concentration as 50000 to 500000 mg / L, utilizing the maximum safe volume of a primary cleaning tank as a standard, injecting 3 / 4 of high fluorine content wastewater, injecting 1 / 4 limewater, utilizing a stirring blade in the tank to mix, guiding HNO3 liquid to clean and mix and treating to obtain desalted mixed hydrochloric acid fluorine-containing mixed wastewater, wherein the feeding amount of HNO3 is reduced by 500L to 800L or the total HNO3 feeding amount is reduced by 11% to 20% reference to generally treating the high-concentration fluorine-containing wastewater with thefluorine-containing concentration as 50000 to 500000 mg / L.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to an advanced treatment process for fluorine-containing waste water from single crystal texturing of solar cells. Background technique [0002] Different industries such as ore mining and processing, metal smelting, aluminum electrolysis, coke, glass, electronics, electroplating, fertilizers, pesticides, chemicals, etc. will produce a certain amount of fluorine-containing wastewater [1, 2]. Although fluorine is one of the essential trace elements for the human body, long-term drinking of water with a fluoride ion mass concentration exceeding 1 mg / L can cause dental fluorosis, skeletal fluorosis and other diseases, and even induce tumors, seriously threatening human health 〔3〕, it is necessary to deal with it up to standard. [0003] At present, the treatment methods for high-fluorine wastewater at home and abroad mainly include chemical precipitation, reverse osmosis, coagu...

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Problems solved by technology

However, because the direct use of calcium hydroxide to adjust the pH of the wastewater to 11 is too large and the cost is too high, the method of adjusting the pH with sodium hydroxide and calcium hydroxide with a mass ratio of 1:1 is actually used in the trial operation process. But doing so will make the amount of calcium ions insufficient, so when the influent water quality fluctuates greatly (the concentration of fluoride ions in the influent water varies from 150 to 2 000 mg / L, and the pH is 2 to 3), the fluoride ions in the primary effluent will The mass concentration fluctuates within a large range of 50~300 mg / L

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