Method for removing perfluorinated compounds (PFCs) in wastewater through micro-nano gas-floating coupled electrooxidation device

An oxidation device, gas-water mixture technology, applied in chemical instruments and methods, water pollutants, flotation water/sewage treatment, etc., can solve problems such as difficult to work, save energy consumption, save chemical dosage, and avoid treatment water volume big effect

Inactive Publication Date: 2019-10-18
江苏智诚达环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are relatively few high-efficiency treatment devices for perfluorinated organic pollutants. Due to their high stability and strong toxicity, conventional degradation methods (such as chemical oxidation, biodegradation, etc.) are difficult to work, so it is urgent to develop an efficient treatment of this type of wastewater method

Method used

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  • Method for removing perfluorinated compounds (PFCs) in wastewater through micro-nano gas-floating coupled electrooxidation device

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Embodiment 1

[0029] The application method of this embodiment is: adopt 50mg / L PFOA as simulated wastewater, turn on the water inlet pump (2) and the micro-nano bubble generating device (3), adjust the air intake of (3) to 0.5mL / min, at this time milky white The gas-water mixture reaches the contact chamber ○A of the reaction device through the high-speed water outlet diffuser (4); then, turn on the agitator (5), adjust the pH of the wastewater to 8.0 through the dosing tank (9), and then add the total wastewater Aluminum sulfate with a mass fraction of 0.03%; the gas-water mixture then reaches the separation chamber, and the PFOA in the wastewater floats to the water surface under the action of air bubbles, jacking and a small amount of flocculant, and enters the electro-oxidation through the slag-water mixture outlet (12). Unit (7), the waste water not containing PFCs is discharged from the water outlet (13) of the separation chamber; add 50mM Na2SO4 supporting electrolyte in advance in (...

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Abstract

The invention relates to a method for removing perfluorinated compounds (PFCs) in wastewater through a micro-nano gas-floating coupled electrooxidation device. The method comprises the steps that (S1)a water inlet pump and a micro-nano bubble generation device are started, the gas inlet amount is adjusted to be 0.3-0.7 mL / min, and a milky gas-water mixture reaches a contact chamber of a reactiondevice through a high-speed water outlet diffuser; (S2) a stirrer is started, the pH value of the wastewater is adjusted through acid or base firstly through a chemical adding groove, and then a coagulant is added; (S3) the gas-water mixture reaches a separation chamber subsequently, the PFCs in the wastewater float upwards to the water surface under the effect of coercing and jacking of bubbles and the effect of a small amount of flocculant, and enter an electrooxidation unit from a slag-water mixture outlet, and the wastewater not containing the PFCs is discharged from a water outlet of a separation chamber; (S4) an electrolyte is added into the electrooxidation unit, after a collected PFCs water-slag mixture reaches a certain volume, the current density is adjusted for electrolysis, andpurified water is discharged from the water outlet; and (S5) the wastewater discharged from the water outlet finally enters a water outlet groove and is discharged after reaching the standard.

Description

technical field [0001] The invention belongs to the field of water pollution control and relates to a method for removing perfluorinated compounds (PFCs) in wastewater by using a micro-nano air flotation coupling electro-oxidation device. Background technique [0002] Perfluorinated compounds (PFCs) are a class of persistent organic pollutants with stable chemical properties, mainly perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), perfluorooctanesulfonyl fluoride, etc., which are widely used in foam Production of agents, leather, etc., has been continuously detected in various water environments (surface water, groundwater, and drinking water) in recent years. Many PFCs have significant persistence, bioaccumulation and toxicity, and at the fourth meeting of the Parties to the POPs Convention, PFOS and its salts and perfluorooctanesulfonyl fluoride in perfluorinated compounds were listed in the Convention In Appendix B, the US Environmental Protection Agen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/14
CPCC02F1/24C02F1/4672C02F1/5236C02F1/56C02F3/30C02F9/00C02F2101/14
Inventor 牛连勇
Owner 江苏智诚达环保科技有限公司
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