Biodegradation of fatty alcohol ethoxylates in the continuous flow activated sludge test

Biodegradation of fatty alcohol ethoxylates in the continuous flow activated sludge test Biodegradation of two fatty alcohol ethoxylates: surfactant C12E10 (C 12 with an average 10 oxyethylene subunits (EO)) and Marlipal 1618/25 (C 16–18 with an average 25 EO) were tested under the continuous flow activated sludge conditions of the classical Husmann plant and a plant having a denitrifying chamber. Primary biodegradation and concentration of metabolites: free fatty alcohol (FFA) and poly(ethylene glycols) (PEG) were measured. PEG were divided into two fractions: short-chained (1–3 EO) and long-chained PEG (>3 EO). Tensammetric methods were used for analysis. High primary biodegradation was found (96.8±0.5% for surfactant C12E10 (C12E10) and 99.6±0.1% for Marlipal 1618/25 (Marlipal)), though with a high concentration of metabolites: FFA and PEG. FFA concentration corresponded to 30–100% of theoretically predicted concentration (presuming central fission) and dependent on the chemical structure of surfactant and type of plant used for testing. Total PEG concentration was about 20% of that predicted on the basis of central fission, while the ratio of short-chained PEG in the total PEG varied from 20 to 70% and depended on the chemical structure of surfactant and type of plant used for testing. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Research Elsevier

Biodegradation of fatty alcohol ethoxylates in the continuous flow activated sludge test

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Publisher
Elsevier
Copyright
Copyright © 2000 Elsevier Science Ltd
ISSN
0043-1354
DOI
10.1016/S0043-1354(00)00157-3
Publisher site
See Article on Publisher Site

Abstract

Biodegradation of two fatty alcohol ethoxylates: surfactant C12E10 (C 12 with an average 10 oxyethylene subunits (EO)) and Marlipal 1618/25 (C 16–18 with an average 25 EO) were tested under the continuous flow activated sludge conditions of the classical Husmann plant and a plant having a denitrifying chamber. Primary biodegradation and concentration of metabolites: free fatty alcohol (FFA) and poly(ethylene glycols) (PEG) were measured. PEG were divided into two fractions: short-chained (1–3 EO) and long-chained PEG (>3 EO). Tensammetric methods were used for analysis. High primary biodegradation was found (96.8±0.5% for surfactant C12E10 (C12E10) and 99.6±0.1% for Marlipal 1618/25 (Marlipal)), though with a high concentration of metabolites: FFA and PEG. FFA concentration corresponded to 30–100% of theoretically predicted concentration (presuming central fission) and dependent on the chemical structure of surfactant and type of plant used for testing. Total PEG concentration was about 20% of that predicted on the basis of central fission, while the ratio of short-chained PEG in the total PEG varied from 20 to 70% and depended on the chemical structure of surfactant and type of plant used for testing.

Journal

Water ResearchElsevier

Published: Nov 1, 2000

References

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