Effects of oxygen on biodegradation of benzoate and 3-chlorobenzoate in a denitrifying chemostat
A mixed microbial culture degraded a mixture of benzoate (863 mg/L), 3-chlorobenzoate (3-CB) (69.7 mg/L), and pyruvate (244 mg/L) under denitrifying conditions in a chemostat. Biodegradation under denitrifying conditions was stable, complete (effluent concentrations below detection limits), and proc...
Gespeichert in:
Veröffentlicht in: | Water research (Oxford) 2004-12, Vol.38 (20), p.4524-4534 |
---|---|
Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | A mixed microbial culture degraded a mixture of benzoate (863
mg/L), 3-chlorobenzoate (3-CB) (69.7
mg/L), and pyruvate (244
mg/L) under denitrifying conditions in a chemostat. Biodegradation under denitrifying conditions was stable, complete (effluent concentrations below detection limits), and proceeded without the production of toxic intermediates like chlorocatechols. The addition of oxygen at mass input rates of 6.2%, 15.5%, and 43.9% of the mass input rate of chemical oxygen demand (COD) (337
mg COD/h) did not induce the synthesis of aerobic biodegradation pathways and thus did not disrupt biodegradation. Rather, the oxygen was used as a terminal electron acceptor, displacing a stoichiometric amount of nitrate, leading to microaerobic conditions (dissolved oxygen concentration |
---|---|
ISSN: | 0043-1354 1879-2448 |
DOI: | 10.1016/j.watres.2004.08.011 |