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Method and apparatus for treating waste water containing low-concentration perfluoro ammonium caprylate

A technology for ammonium perfluorooctanoate and waste water treatment, applied in water/sewage treatment, flotation water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of high energy consumption and uneconomical, and achieve the effect of low energy consumption

Inactive Publication Date: 2007-11-14
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

Existing processing method has: distillation recovery method, its shortcoming is that energy consumption is high, uneconomical; waste solids

Method used

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  • Method and apparatus for treating waste water containing low-concentration perfluoro ammonium caprylate

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Embodiment Construction

[0015] As shown in the drawings, the waste water storage tank 5 of the present invention is connected with the clear and transparent waste water input pipe containing ammonium perfluorooctanoate from centrifugation, the concentrated nanofiltration retentate liquid input pipe and the waste water output pipe, and the waste water is output through the water pump 6, the first valve, The liquid rotameter 7 is connected from the top of the foam separation tower 9, and the end of the connection pipe is equipped with a liquid distributor 10; the compressed air of the air compressor 1 is connected to the buffer humidification tank 2 and the buffer humidification tank through the second valve 2 is divided into two roads, one road is connected to the bottom of the foam separation tower 9 through the third valve, the gas rotameter 4, and the bottom of the foam separation tower 9 is equipped with a gas distribution plate 8, and the other road is connected to the vent valve 3, and connected t...

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Abstract

This invention relates to a treatment methods and device of low concentration perfluoro ammonium caprylate waste water. Pump clear perfluoro ammonium caprylate waste water into foam separation tower to carry out foam separation, defoam the wastewater tower top spume to gain high concentration perfluoro ammonium caprylate water solution which can be reutilized; gain lower concentration perfluoro ammonium caprulate water solution at tower bottom; use first order nano filter membrane to filter perfluoro ammonium caprylate water solution ejected by tower bottom, condense nano filtration trapped fluid, return it to foam separation tower to carry out foam separation; the permeation liquid of first order nano filter membrane enter secondary nano filter membrane; permeance liquid of secondary nano filter membrane can reach state waste water effluent standard; concentrated solution of secondary nano filter membrane return to first order nano filter membrane; then complete recycling and cleaning of waste water.

Description

technical field [0001] The invention relates to the treatment of wastewater containing surfactants, in particular to a method and device for treating wastewater containing low-concentration perfluorooctanoic acid ammonium. Background technique [0002] When the dispersion method is used to produce PTFE resin, a certain amount of dispersant ammonium perfluorooctanoate (PFOA) must be added, and finally the wastewater with low concentration of ammonium perfluorooctanoate is discharged out of the system. Ammonium perfluorooctanoate is an expensive and efficient surfactant, which is difficult to biodegrade and has great harm to the environment. Therefore, it is both economically and socially meaningful to treat wastewater to recover ammonium perfluorooctanoate. Existing processing method has: distillation recovery method, its shortcoming is that energy consumption is high, uneconomical; of waste solids. Contents of the invention [0003] In order to treat waste water economi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F9/02C02F1/38C02F1/44C02F1/24C02F101/38
Inventor 南碎飞王斐窦梅
Owner ZHEJIANG UNIV
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