Chemical Engineering and Science
ISSN (Print): 2328-7381 ISSN (Online): 2328-7373 Website: http://www.sciepub.com/journal/ces Editor-in-chief: Apply for this position
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Chemical Engineering and Science. 2014, 2(1), 11-14
DOI: 10.12691/ces-2-1-3
Open AccessArticle

The Phase-out of Perfluorooctane Sulfonate (PFOS) and the Global Future of Aqueous Film Forming Foam (AFFF), Innovations in Fire Fighting Foam

Anant R. Sontake1 and Sameer M.Wagh2,

1Fire Service Department, Bhilai Steel Plant (SAIL), Bhilai. India

2Department of Chemical Technology, Laxminarayan Institute of Technology, RTMNU, Nagpur, India

Pub. Date: February 23, 2014

Cite this paper:
Anant R. Sontake and Sameer M.Wagh. The Phase-out of Perfluorooctane Sulfonate (PFOS) and the Global Future of Aqueous Film Forming Foam (AFFF), Innovations in Fire Fighting Foam. Chemical Engineering and Science. 2014; 2(1):11-14. doi: 10.12691/ces-2-1-3

Abstract

Aqueous film-forming foams (AFFFs) are among the most popular fire-fighting foams used in liquid fuel fires because of their film forming and fast knock down property. One key ingredient of AFFFs, the fluorocarbon surfactant i.e. perfluorooctane sulfonate (PFOS) which is used to reduce surface tension and positive spreading coefficient, is toxic to aquatic life and is a persistent chemical that accumulates in the blood of humans and other animals. Surfactants are not found naturally in the environment and are man-made. In the year 2000 unexpectedly announcement of phasing out fluorocarbon surfactant’s manufacturing and its storage which effected a number of product lines, including the firefighting foams. Internationally the manufacturing and release of PFOS to the environment will be suspended by 2015. New fluorosurfactants have been introduced into the market with reformulation and used to form aqueous fire-fighting foam concentrates. The toxicity of the new fluorosurfactants and their persistence in the environment are not well established and still are under investigation. Their presence in the future market is unsure. The continuous research and development to find out the substitute for perfluorooctane sulfonate derivative (C8) has brought two choices i.e. Fluorine-free foams or Fluorotelomer (C6)-based Foams. These foams which may fulfill requirement of different international standards of fire fighting but still contain small amounts of fluorochemicals and are thus not truly fluorine-free. There is every possibility that even after 2015 new regulation may come in to effect to restrict the use of these new formulations (C6) of fire fighting foam. Therefore, the fire-fighting industry has an urgent need for new, environmental friendly foaming agents and foam stabilizers to replace fluorosurfactants in aqueous fire-fighting foams with enhanced drain time, low bubble coarsening, and faster knockdown and excellent burn back resistance properties.

Keywords:
fire fighting surfactant PFOS phase out aqueous film-forming foams surface tension spreading coefficient

Creative CommonsThis work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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References:

[1]  UL 162, "Standard for Foam Equipment and Liquid Concentrates, "Underwriters Laboratories Inc., Northbrook, IL, Sixth Edition, 1994.
 
[2]  Military Specification, “Fire Extinguishing Agent, Aqueous Film-Forming Foam (AFFF) Liquid Concentrate, for Fresh and Seawater,” MIL-F-24385F, 7 January 1992.
 
[3]  Conference review, 2013, Fifth International Fire Fighting Foam Conference, Reebok Stadium, Bolton (UK)
 
[4]  Guruge K.S, Yeung L.W.Y, Li P, Taniyasu S, Yamashita N, Nakamura M. 2011., Fluorinated alkyl compounds including long chain carboxylic acids in wild bird livers from Japan.
 
[5]  Jin C.F., Sun Y.H., Islam A., Qian Y., and Ducatman A., 2011. Perfluoroalkyl acids including perfluorooctane sulphonate and perfluorohexane sulphonate in firefighters Amer. Coll. Occup. Environ. Med.
 
[6]  Aerobic biodegradation studies of 6:2 fluorotelomer sulfonate in activated sludge, N. Wang et al, DuPont, manuscript in preparation, 2010.
 
[7]  Environmental Impacts of Fire Fighting Foams by William H. Rupert, Daniel P. Verdonik, and Christopher Hanauska of Hughes Associates, Inc. (2005)
 
[8]  Serex, T. et al., (2009). Hazard evaluation of 6-2 fluorotelomer alcohol (6-2 FTOH), 1,1,2,2-tetrahydroperfluorooctanol. The Toxicologist, Supplement to Toxicological Sciences.
 
[9]  Liu, J.; et al. (2010). 6-2 Fluorotelomer alcohol aerobic biodegradation in soil and mixed bacterial culture. Chemosphere
 
[10]  Scheffey, J. L., Leach, W., and Fallis, S., "Performance Analysis of Foam Agents Required to Combat Liquid Fuel Hazards," Proceedings of the AFFF and the Environment Working Group, Panama City, FL, Oct. 16-18, 2001.
 
[11]  Dr. Jimmy Seow, Department of Environment and Conservation Western Australia, 2013, Fire Fighting Foam with perfluorochemical environmental review.
 
[12]  Apelberg B.J., Witter F.R., Herbstman J.B., Calafat A.M., Halden R.U., Needham L.L., Goldman L.R., 2007b. Cord serum concentrations of perfluorooctane sulphonate (PFOS) and perfluorooctanoate (PFOA) in relation to weight and size at birth. Environ. Health Perspect. 115(11), 1670-1676.
 
[13]  Australian Department of Defence, June 2007. Environmental Guidelines for Management of Fire Fighting Aqueous Film Forming Foam (AFFF) Products.
 
[14]  Buck R.C., Hoke R.A. and Serex T., 2011. The toxicology of 6:2 Fluorotelomer Sulphonate C6F13CH2CH2SO3-, 6:2 FTSA. 3rd International Workshop on nthropogenic Perfluorinated Compounds in Amsterdam The Netherlands on June 15 to 17, 2011.
 
[15]  Schlummer M., Gruber L., Schmitt A., and Lange F.T., 2008. Single application of fire fighting foam has increased levels of perfluorooctane sulphonate (PFOS) in receiving waters and fish.
 
[16]  Canada Gazette, 2010. Order Adding Toxic Substances to Schedule 1 to the Canadian Environmental Protection Act, 1999. Vol. 144, No. 21, October 13, 2010.