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Method for removing PFOS (Perfluorooctane sulfonate)-based compound from drinking water

A technology of perfluorooctane sulfonic acid and drinking water, which is applied in the field of water treatment, can solve the problems of membrane flux decline and other problems, and achieve the effect of slowing down pollution problems

Inactive Publication Date: 2013-03-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in specific applications, it is found that natural organic matter in water will adsorb and precipitate on the surface of the membrane and in the pores of the membrane, resulting in a decrease in membrane flux. Membrane fouling is a key factor restricting the application of membrane technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Contain 20mg / L humic acid, 100ppb perfluorooctane sulfonic acid, first add 0.1mM AlCl 3 , followed by 250r / min stirring for 0.5min, 200r / min stirring for 1min and 60r / min stirring for 15min, after coagulation, the water enters the nanofiltration membrane treatment system, selects NF270 nanofiltration membrane, adjusts the operating pressure to 0.6MPa, adjusts the pH=7, Nanofiltration separation performance experiment was carried out, and the rejection rate of PFOS was 98%.

Embodiment 2

[0017] Contain 10mg / L humic acid, 100ppb perfluorooctane sulfonic acid, first add 0.1mM AlCl 3 , followed by 250r / min stirring for 0.5min, 200r / min stirring for 1min and 60r / min stirring for 15min, after coagulation, the water enters the nanofiltration membrane treatment system, selects NF200 nanofiltration membrane, adjusts the operating pressure to 0.3MPa, adjusts the pH=3, Nanofiltration separation performance experiment was carried out, and the rejection rate of PFOS was 97%.

Embodiment 3

[0019] Contain 20mg / L humic acid, 500ppb perfluorooctane sulfonic acid, first add 0.1mM FeCl 3 , followed by 250r / min stirring for 0.5min, 200r / min stirring for 1min and 60r / min stirring for 15min, after coagulation, the water enters the nanofiltration membrane treatment system, selects NF270 nanofiltration membrane, adjusts the operating pressure to 0.6MPa, adjusts the pH=9, Nanofiltration separation performance experiment was carried out, and the rejection rate of PFOS was 98.7%.

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PUM

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Abstract

The invention provides a method for removing PFOS (Perfluorooctane sulfonate)-based compound from drinking water. The method comprises the following steps of; adding a coagulant into the drinking water, stirring, regulating the pH value of coagulation effluent water to be 3-9, and performing nanofiltration membrane separation. According to the method, coagulation pretreatment and nanofiltration are coupled and integrated, and a method for treating PFOS in drinking water by utilizing coagulation and nanofiltration, so that not only can a practicable treatment method be provided for the PFOS in the drinking water, but also the problem of filter membrane pollution in the separation process can be effectively retarded at the same time.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for removing perfluorooctane sulfonate compounds in drinking water through a coagulation-nanofiltration combined process. Background technique [0002] Perfluorooctane sulfonate (PFOS) is an important perfluorinated surfactant and an important precursor of many other perfluorinated compounds. Studies have shown that it has various toxic effects such as causing lipid peroxidation, teratogenicity, carcinogenicity and neurotoxicity in the body; it is difficult to degrade in the environment, can be transmitted over long distances, and accumulates and amplifies in animals and humans along the food chain. Considered a new class of persistent organic pollutants with endocrine disrupting properties. At present, traces of PFOS and other perfluorinated compounds pollution have been detected in the investigated water bodies, sediments and organisms around the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/44C02F101/36C02F1/52
Inventor 赵长伟张健栾兆坤王涛贾智萍
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI