Fluorine removal device and process for fluorine-containing wastewater
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A waste water and waste water pump technology, which can be used in water pollutants, multi-stage water treatment, water/sewage treatment, etc., and can solve the problems of other ions exceeding the standard.
Pending Publication Date: 2021-06-08
四川省创飞格环保技术有限公司
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[0005] In order to solve the problem that other ions easily exceed the standard in the fluorine-containing wastewater defluorination process and the defluorination device used in the prior art, a fluorine-containing wastewater defluorination device and process are provided
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Embodiment 1
[0041] A process for removing fluoride from fluorine-containing wastewater, comprising the steps of:
[0042] 1) Adjustment: Discharge the wastewater containing high concentration of fluorine together with dilute fluorine wastewater, alkaline wastewater, comprehensive washing water, etc. into the buffer tank 1 for homogeneous and even quantity adjustment, and the adjustment time is 12 hours;
[0043] 2) Primary reaction: continuously pump the fluorine-containing wastewater from the buffer tank 1 into the primary reaction tank 3, add a small amount of sulfuric acid at the same time to keep the pH of the primary reaction tank 3 at 1.5, and add the calcium sulfate salt slurry prepared by the dispensing tank 8, Ca : F=2.0:1 (mol), the primary reaction time is 20 minutes;
[0044] 3) secondary reaction: the waste water after the primary reaction enters the secondary reaction tank 4, and the secondary reaction tank 4 adds a small amount of lime slurry to adjust the pH to 7, and the ...
Embodiment 2
[0049] A process for removing fluoride from fluorine-containing wastewater, comprising the steps of:
[0050] 1) Adjustment: Discharge the wastewater containing high concentration of fluorine, the wastewater containing dilute fluorine, alkaline wastewater, and comprehensive washing water into the buffer tank 1 for homogeneous and even quantity adjustment, and the adjustment time is 24 hours;
[0051] 2) Primary reaction: continuously pump the fluorine-containing waste water from the buffer tank 1 into the primary reaction tank 3, add sulfuric acid to keep the pH of the primary reaction tank 3 at 3.0, and add the calcium sulfate salt slurry prepared by the dispensing tank 8, Ca:F =2.5:1mol, the primary reaction time is controlled at 30 minutes;
[0052]3) secondary reaction: the waste water after the primary reaction enters the secondary reaction tank 4, and the secondary reaction tank 4 adds lime slurry to adjust the pH to 8, and the secondary reaction time is controlled at 30...
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Abstract
The invention discloses a fluorine removal device and process for fluorine-containing wastewater, belongs to the technical field of industrial wastewater treatment, and solves the problem that: in the prior art, fluorine removal processes and fluorine removal devices used by the processes for fluorine-containing wastewater easily cause other ions to exceed the standard. The device comprises a buffer tank, the buffer tank is connected to a wastewater pump, the wastewater pump is connected with a first-stage reaction tank, the first-stage reaction tank is connected with a second-stage reaction tank, the second-stage reaction tank is connected with a third-stage reaction tank, the third-stage reaction tank is connected with a settling tank, the bottom of the settling tank is connected with a sludge pump, the settling tank is further connected with a dispensing tank, the dispensing tank is connected with a calcium salt lifting pump, and the calcium salt lifting pump is connected with the first-stage reaction tank. The device is used for safe and low-cost fluorine removal of the fluorine-containing wastewater, the cost is reduced by using the calcium sulfate, and chloride ions are prevented from exceeding the standard.
Description
technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a fluoride removal device and process for fluorine-containing wastewater. Background technique [0002] According to the "Battery Industry Pollutant Discharge Standard" (GB30484-2013), in the discharge limit of corporate wastewater in the solar cell industry, the discharge requirement for fluorine is ≤8.0mg / L, while the high-fluorine concentrated water discharged during the acid throwing production process The fluorine content is as high as more than 70,000, and even after being adjusted by the wastewater regulating tank, the fluorine content is about 1000mg / L; the alkali throwing process has greatly improved the fluorine discharge. After being adjusted by the regulating tank, the fluorine content in the water quality is 400 Between -600mg / L. [0003] The conventional defluoridation process is to add lime to the wastewater to provide calcium e...
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