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DatoValore
TitleTOXICITY ASSESSMENT OF COMMON XENOBIOTIC COMPOUNDS ON MUNICIPAL ACTIVATED SLUDGE: COMPARISON BETWEEN RESPIROMETRY AND MICROTOX
AbstractThe toxicity of four xenobiotic compounds 3,5-dichlorophenol, formaldehyde, 4-nitrophenol and dichloromethane, representative of industrial wastewater contaminants was evaluated by a simple respirometric procedure set up on the basis of OECD Method 209 and by the Microtox® bioassay. Very good reproducibility was observed for both methods, the variation coefficients being in the range of 2-10% for the respirometric procedure and 6-15% for Microtox®, values that can be considered very good for a biological method. Comparison of EC50 data obtained with the two methods shows that in both cases 3,5-dichlorophenol is more toxic than other compounds investigated and dichloromethane has a very low toxicity value. Intermediate EC50 values were found for the two other chemicals, formaldehyde and 4-nitrophenol. Moreover, the Microtox® EC 50 values are generally lower (except for dichloromethane) than the respirometric ones: these differences could be explained by the fact that the Microtox® method uses a pure culture of marine species and, therefore, should not necessarily be expected to behave like a community of activated sludge bacteria. In conclusion, both methods can be usefully applied for toxicity detection in wastewater treatment plants but it is advisable to take into account that Microtox® is more sensitive than respirometry in estimating the acute toxicity effect on the biomass operating in the plant.
SourceWater research (Oxf.) 38 (8), pp. 2103–2110
KeywordsChemicalsMicrotox®Municipal activated sludgeRespirometryToxicity
JournalWater research (Oxf.)
EditorPergamon Press., New York, Regno Unito
Year2004
TypeArticolo in rivista
DOI10.1016/j.watres.2004.01.020
AuthorsRICCO G., TOMEI M.C., RAMADORI R., LAERA G.
Text42230 2004 10.1016/j.watres.2004.01.020 ISI Web of Science WOS 000221204500017 Chemicals Microtox® Municipal activated sludge Respirometry Toxicity TOXICITY ASSESSMENT OF COMMON XENOBIOTIC COMPOUNDS ON MUNICIPAL ACTIVATED SLUDGE COMPARISON BETWEEN RESPIROMETRY AND MICROTOX RICCO G., TOMEI M.C., RAMADORI R., LAERA G. CNR Istituto di Ricerca Sulle Acque, Viale F. De Blasio 5, Bari 70123, Italy CNR Istituto di Ricerca Sulle Acque, Via Reno, 1, Roma 00198, Italy The toxicity of four xenobiotic compounds 3,5 dichlorophenol, formaldehyde, 4 nitrophenol and dichloromethane, representative of industrial wastewater contaminants was evaluated by a simple respirometric procedure set up on the basis of OECD Method 209 and by the Microtox® bioassay. Very good reproducibility was observed for both methods, the variation coefficients being in the range of 2 10% for the respirometric procedure and 6 15% for Microtox®, values that can be considered very good for a biological method. Comparison of EC50 data obtained with the two methods shows that in both cases 3,5 dichlorophenol is more toxic than other compounds investigated and dichloromethane has a very low toxicity value. Intermediate EC50 values were found for the two other chemicals, formaldehyde and 4 nitrophenol. Moreover, the Microtox® EC 50 values are generally lower except for dichloromethane than the respirometric ones these differences could be explained by the fact that the Microtox® method uses a pure culture of marine species and, therefore, should not necessarily be expected to behave like a community of activated sludge bacteria. In conclusion, both methods can be usefully applied for toxicity detection in wastewater treatment plants but it is advisable to take into account that Microtox® is more sensitive than respirometry in estimating the acute toxicity effect on the biomass operating in the plant. 38 http //www.sciencedirect.com/science/article/pii/S0043135404000430 Articolo pubblicato 2004_Wat_Res_38_2103_2110.pdf Articolo in rivista Pergamon Press. 0043 1354 Water research Oxf. Water research Oxf. Water res. Oxf. Water research. Oxf. giuseppe.laera LAERA GIUSEPPE roberto.ramadori RAMADORI ROBERTO mariaconcetta.tomei TOMEI MARIA CONCETTA TA.P07.001.001 Sviluppo di tecnologie depurative a regime non stazionario TA.P07.002.004 Processi biotecnologici e processi a membrana