How adaptation and mass transfer control the biodegradation of linear alkylbenzene sulfonate by activated sludge

Citation
Be. Rittmann et al., How adaptation and mass transfer control the biodegradation of linear alkylbenzene sulfonate by activated sludge, BIODEGRADAT, 12(1), 2001, pp. 31-37
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Biotecnology & Applied Microbiology
Journal title
BIODEGRADATION
ISSN journal
0923-9820 → ACNP
Volume
12
Issue
1
Year of publication
2001
Pages
31 - 37
Database
ISI
SICI code
0923-9820(2001)12:1<31:HAAMTC>2.0.ZU;2-H
Abstract
We use a nonsteady-state model to evaluate the effects of community adaptat ion and sorption kinetics on the fate of linear alkylbenzene sulfonate (LAS ) in batch experiments conducted with activated sludge that was continuousl y fed different concentrations of LAS. We observed a sharp decrease in the biodegradation rate between 30 and 60 minutes and the presence of an LAS re sidual at the end of the batch experiments. The modeling analysis indicates that these phenomena were caused by relatively slow inter-phase mass trans port of LAS. The modeling analyses also showed that the amount of LAS-degra ding biomass increased when the continuous activated sludge was fed a highe r LAS concentration. Although community adaptation to LAS involved accumula tion of more LAS degraders, the increase was not proportional to the feed c oncentration of LAS, which supports the concept that LAS degraders also uti lized portions of the general biochemical oxygen demand (BOD) fed to the co ntinuous activated sludge systems.