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Titolo:
Cometabolic degradation of chlorophenols by Acinetobacter species
Autore:
Kim, MH; Hao, OJ;
Indirizzi:
Univ Maryland, Dept Civil Engn, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 ivil Engn, College Pk, MD 20742 USA
Titolo Testata:
WATER RESEARCH
fascicolo: 2, volume: 33, anno: 1999,
pagine: 562 - 574
SICI:
0043-1354(199902)33:2<562:CDOCBA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
METHYLOSINUS-TRICHOSPORIUM OB3B; PSEUDOMONAS-PUTIDA F1; HALOGENATED ALIPHATIC-COMPOUNDS; SOLUBLE METHANE MONOOXYGENASE; CO-METABOLISM; TRICHLOROETHYLENE DEGRADATION; AMMONIA MONOOXYGENASE; NITROSOMONAS-EUROPAEA; TOLUENE DIOXYGENASE; MIXED CULTURE;
Keywords:
cometabolic degradation; growth transformation yield; reluctant supply; substrate competition/inhibition;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Hao, OJ Edgewood Res Dev & Engn Ctr, Engn Technol Team, Aberdeen Proving Ground, MD Edgewood Res Dev & Engn Ctr Aberdeen Proving Ground MD USA 21010
Citazione:
M.H. Kim e O.J. Hao, "Cometabolic degradation of chlorophenols by Acinetobacter species", WATER RES, 33(2), 1999, pp. 562-574

Abstract

Phenol-induced cells of Acinetobacter species were used to degrade 4- and 3-chlorophenols (CP). Several different patterns of batch 4- or 3-CP degradation were shown by cultures growing in different concentration ratios of phenol (growth substrate) to 4- or 3-CP, e.g, complete degradation of 4- or 3-CP at the depletion of phenol. partial 4- or 3-CP degradation at the depletion of phenol and inhibition of both phenol and 3-CP degradations, These patterns are characteristics of concentration-dependent substrate competition/inhibition between phenol and CP. As the initial concentration ratio of phenol/4-CP reduced, decreasing values of the cell growth yield were obtained from each batch experiment. Two different values of a critical concentration ratio were necessary to completely degrade 4- and 3-CP in the presenceof phenol; below these ratios, the initial amount of 4- or 3-CP was only partially degraded. The 3-CP transformation product toxicity, as opposed to the absence in phenol/4-CP, might have accounted for the requirement of a higher critical phenol/3-CP concentration ratio than that for phenol/4-CP. Furthermore. higher COD accumulation (2.38 mg COD mg(-1) 3-CP vs 1.27 mg CODmg(-1) 4-CP) but less chloride release (0.13 mg Cl- mg(-1) 3-CP vs 0.26 meCl- mg(-1) 4-CP) was obtained in phenol/3-CP experiments. These results suggest that the cometabolic degradation pathways for 4- and 3-CP may differ at the monooxygenation step such that the overt 3-CP transformation producttoxicity could be attributed to accumulation and autopolymerization of 3-chlorocatechol. (C) 1998 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/08/20 alle ore 15:07:41