Anaerobic Biodegradation of Surfactants – Scientific Review / J. L. Berna in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 6/2007 (12/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 6/2007 (12/2007) . - p. 312-347 Titre : Anaerobic Biodegradation of Surfactants – Scientific Review Type de document : texte imprimé Auteurs : J. L. Berna, Auteur ; G. Cassani, Auteur ; C.-D. Hager, Auteur ; N. Rehman, Auteur ; I. Lopez, Auteur ; D. Schowanek, Auteur ; J. Steber, Auteur ; K. Taeger, Auteur ; T. Wind, Auteur Année de publication : 2008 Article en page(s) : p. 312-347 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants -- Biodégradation Tags : Anaerobic  biodegradation  biodegradability  Wastewater  treatment  Screening  tests  Simulation  sediment  Monitoring  data Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The anaerobic biodegradation of surfactants is used as an acceptability criterion in some environmental pieces of legislation (eco-label, risk assessment, etc.), without a proper evaluation of the relevance of such a characteristic. Available screening test methods to assess the anaerobic biodegradation do not simulate the real conditions prevailing in these anaerobic compartments but rather reflect more stringent conditions, due to the high test substance/biomass ratio, possibility of inhibitory effects and limited possibility for adaptation. Therefore positive results are indicative of a similar behaviour under environmental conditions, while a negative result cannot be necessarily interpreted as inherent anaerobic recalcitrance. The majority of surfactants entering the environment will be exposed to and degraded under aerobic conditions, and only less than 20% will potentially reach temporarily anaerobic environmental compartments. In contrast to the well documented adverse effects observed in the absence of aerobic biodegradation, the lack of anaerobic biodegradation does not seem to be correlated with any apparent environmental problem for most compartments after more than 40 years of widely use of such products. The scientific review concluded that anaerobic biodegradability does not have the same environmental relevance as the aerobic one. Anaerobic biodegradability should not, therefore, be used as a pass/fail property for the environmental acceptability of surfactants which are readily biodegradable under aerobic conditions. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3195 [article]

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Surfactants in sediments / L. Cavalli in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 37, N° 5/2000 (09-10/2000)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 37, N° 5/2000 (09-10/2000) . - p. 282-288 Titre : Surfactants in sediments Type de document : texte imprimé Auteurs : L. Cavalli, Auteur ; A. Zatta ; M. Lazzarin ; G. Nucci ; S. Pravettoni ; L. Vigano ; G. Cassani, Auteur Année de publication : 2000 Article en page(s) : p. 282-288 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Chromatographie en phase liquide Eau douce Eaux continentales -- Pollution Ecotoxicologie Ethers de glycol Milieu marin -- Pollution Nonylphenol éthoxylates Pollution -- Mesure Polyéthylène glycol Sédiments contaminés Sulfonates d'alkylbenzène Surfactants -- Toxicologie Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : There is a general paucity of literature data dealing with surfactants monitoring in sediments using specific methodologies. The only surfactants for which a consistent data set already exists are Linear Alkylbenzene Sulphonate (LAS) and Nonyl Phenol Ethoxylate (NPE). Concentrations of LAS and NPE, have in fact been monitored in both fresh water and marine sediments and were generally found to range from 0 to 5.0 mg/kg. Higher levels were reported only for some sediments collected close to untreated or inadequately treated sewage effluent discharges. This paper reviews the existing monitoring data for these surfactants in sediments and also reports the preliminary results of a recent monitoring programme carried out on the bottom sediments of the main watercourse in Italy, the river Po, using HPLC methodologies. For the first time, attention has been focused not only on LAS but also on Alcohol Ethoxylate (AE). To our knowledge this is the first example of a concentration-specific estimate of AE in sediments. These results will be discussed and compared with the limited toxicity information which is available on benthic organisms. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3232 [article]

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