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Method for treating wastewater with low-concentration ammonium perfluorooctanoate through all-film method

A low-concentration ammonium perfluorooctanoate technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as non-continuous operation, high energy consumption by distillation and concentration, and pollution , to achieve high economic and environmental benefits, no secondary pollution, simple operation process

Active Publication Date: 2012-08-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The distillation concentration method has high energy consumption, small processing capacity and cannot be operated continuously; the ion exchange method (CN1465612A) will produce waste water when processing and regenerating the ion exchange resin, causing secondary pollution; the metal ion precipitation method (CN1935771A) must add divalent, Trivalent metal salts cause new pollution; the recovery rate of ammonium perfluorooctanoate in the foam separation method is low, and the treated wastewater does not meet the discharge standard; Nan Suifei et al. improved the method for recovering ammonium perfluorooctanoate by foam separation method, using foam separation method and nano Filtration combined with (CN101070204A) method to process the wastewater containing low-concentration perfluorooctanoic acid ammonium, use nanofiltration to concentrate the lower concentration of perfluorooctanoic acid ammonium aqueous solution after bubbling, and return the concentrated wastewater to the foam separation tower for foam separation. Although the recovery rate of ammonium perfluorooctanoate has been improved, the design of the process is complicated, it is not easy to operate continuously, and it is difficult to scale up

Method used

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  • Method for treating wastewater with low-concentration ammonium perfluorooctanoate through all-film method
  • Method for treating wastewater with low-concentration ammonium perfluorooctanoate through all-film method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] See figure 1 . A device for treating wastewater containing low-concentration ammonium perfluorooctanoate by a full-membrane method includes a raw water tank 1, a feed valve 2, a feed pump 3, a microfiltration module 4, a return valve 5, a clarified feed liquid tank 6, and a feed valve 7. Feed pump 8, primary nanofiltration 9, secondary nanofiltration 10, discharge valve 11, pH adjustment system 12, feed pump 13, tertiary nanofiltration 14, discharge valve 15.

[0034] First, the ammonium perfluorooctanoate wastewater with a concentration of 500ppm is cooled to room temperature and stored in the raw water tank 1, the suspended particulate matter in the wastewater is removed by the microfiltration membrane module 4, and the clarified feed liquid is put into the clarified feed liquid tank 6. Use the pump 8 to pump the clarified feed liquid into the primary and secondary nanofiltration membrane systems for preliminary concentration, and adjust the permeation flux of the na...

Embodiment 2

[0036] See figure 1 . A device for treating wastewater containing low-concentration ammonium perfluorooctanoate by a full-membrane method includes a raw water tank 1, a feed valve 2, a feed pump 3, an ultrafiltration module 4, a return valve 5, a clarified feed liquid tank 6, and a feed valve 7. Feed pump 8, primary nanofiltration 9, secondary nanofiltration 10, discharge valve 11, pH adjustment system 12, feed pump 13, tertiary nanofiltration 14, discharge valve 15.

[0037] First, the ammonium perfluorooctanoate wastewater with a concentration of 500ppm is cooled to room temperature and stored in the raw water pool 1, the suspended particulate matter in the wastewater is removed by the ultrafiltration membrane module 4, and the clarified feed liquid is put into the clarified feed liquid tank 6. Use the pump 8 to pump the clarified feed liquid into the first and second nanofiltration membrane systems for preliminary concentration, and adjust the permeation flux of the nanofi...

Embodiment 3

[0039] See figure 2 . A device for treating wastewater containing low-concentration ammonium perfluorooctanoate by a full-membrane method includes a raw water tank 1, a feed valve 2, a feed pump 3, an ultrafiltration module 4, a return valve 5, a clarified feed liquid tank 6, and a feed valve 7. Feed pump 8, primary nanofiltration 9, secondary nanofiltration 10, discharge valve 11, concentrated liquid storage tank 12, pH adjustment system 13, feed valve 14, feed pump 15, tertiary nanofiltration 16, outlet Feed valve 17.

[0040] First, the ammonium perfluorooctanoate wastewater with a concentration of 500ppm is cooled to room temperature and stored in the raw water pool 1, the suspended particulate matter in the wastewater is removed by the ultrafiltration membrane module 4, and the clarified feed liquid is put into the clarified feed liquid tank 6. Use the pump 8 to pump the clarified feed liquid into the primary and secondary nanofiltration membrane systems for preliminary ...

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Abstract

The invention belongs to the chemical wastewater treatment field, in particular relates to a method for treating wastewater with low-concentration ammonium perfluorooctanoate through all-film method which combines the ultra microfiltration technology and the nanofiltration technology. The method comprises the following steps: firstly adopting microfiltration or ultrafiltration to remove insolubleparticles in the wastewater with low-concentration ammonium perfluorooctanoate; and secondly using a nanofiltration system to concentrate ammonium perfluorooctanoate in the pretreated and clarified wastewater, wherein the nanofiltration system is divided to three levels, each level adopts the concentrated water inner circulation mode to concentrate ammonium perfluorooctanoate to a higher concentration step by step, the permeate of each level of nanofiltration can be directly charged or used as the process water of other processes, and the zero emission of industrial wastewater can be realized. The method of the invention has simple operation, low energy consumption and no secondary pollution; and high-value-added perfluorooctanoic acid can be recycled and the industrial wastewater can meet the direct emission standard or the reuse standard.

Description

field of invention [0001] The invention relates to a method for treating production wastewater containing low-concentration ammonium perfluorooctanoate by a full-membrane method, belonging to the field of chemical wastewater treatment. Background technique [0002] The wastewater discharged from the production of polyvinylidene fluoride resin by emulsion method contains low concentration of perfluorooctanoic acid ammonium salt. Since perfluorooctanoic acid is obtained by electrolysis of fluorine-containing compounds or telomer, the price is very expensive. Therefore, its cost is higher than that of polyvinylidene fluoride production. A large proportion of the cost. Moreover, perfluorooctanoic acid is a non-degradable compound in organisms and the environment, and its hazards to health and the environment have gradually been confirmed by many studies. If the production wastewater containing low-concentration ammonium perfluorooctanoate is directly discharged, it will not onl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/21C02F9/02C02F1/44
Inventor 杭晓风万印华陈向荣苏仪沈飞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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