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Mizuki H.,The University of KitakyushuKitakyushu | Toyomura M.,The University of KitakyushuKitakyushu | Uezu K.,The University of KitakyushuKitakyushu | Yasui H.,The University of KitakyushuKitakyushu | And 7 more authors.
Sustainable Environment Research | Year: 2010

Biodegradability under natural environmental conditions determines the ecotoxicological potential of a chemical. The biodegradability of a soap-based fire-fighting agent (SFFA), composed of long chain fatty acid salts, a chelating agent and diluents, by microorganisms in rivers and soils was investigated under aerobic conditions. Activated sludge from a wastewater treatment plant was used as the medium exposed to SFFA.Results of batch respirometric tests showed the presence of three distinct substrate fractions considered to be long chain fatty acid salts, a chelating agent (N,N-bis(carboxymethyl)glutamate tetrasodium salt, and glycols (propylene glycol and hexylene glycol). The three substrate fractions were found to degrade within the first day of incubation. The SFFA was readily biodegraded under aerobic conditions. © 2010, Chinese Institute of Environmental Engineering. All rights reserved.

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