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Titolo:
BIOLOGICAL REMOVAL OF AQUEOUS HEXAVALENT CHROMIUM
Autore:
CHEN JM; HAO OJ;
Indirizzi:
UNIV MARYLAND,DEPT CIVIL ENGN COLLEGE PK MD 20742 UNIV MARYLAND,DEPT CIVIL ENGN COLLEGE PK MD 20742
Titolo Testata:
Journal of chemical technology and biotechnology
fascicolo: 1, volume: 69, anno: 1997,
pagine: 70 - 76
SICI:
0268-2575(1997)69:1<70:BROAHC>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
PSEUDOMONAS-FLUORESCENS; SELENATE REDUCTION; RESPIRATION; CULTURE;
Keywords:
BIOLOGICAL METAL REMOVAL; HEXAVALENT CHROMIUM; ANAEROBIC CHEMOSTAT; ACETATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
J.M. Chen e O.J. Hao, "BIOLOGICAL REMOVAL OF AQUEOUS HEXAVALENT CHROMIUM", Journal of chemical technology and biotechnology, 69(1), 1997, pp. 70-76

Abstract

The conventional chemical reduction of Cr(VI) to Cr(III) and subsequent Cr(OH), precipitation are expensive due to the use of large amountsof chemicals and the generation of chemical sludges. An attempt was carried out for microbial Cr(VI) removal in an anaerobic chemostat fed with an acetate-containing synthetic medium. With 26 mg Cr(VI) dm(-3) in the influent, almost complete removal of Cr(VI) was achieved at dilution rates of 0.15 and 0.32 day(-1) at 20 degrees C and at 35 degreesC, respectively. The optimum Cr(VI) mass loading and the specific Cr(VI) applied rates were found to be 5 mg Cr(VI) dm(-3) day(-1) and 0.02mg Cr(VI) mg(-1) VSS day(-1), respectively. Either the influent Cr(VI) concentration or the dilution rate could be adjusted to maintain an efficient removal of Cr(VI) in a continuous operation. Since the Cr(VI)-reducing activity is associated with the biomass concentration in the system, recycling the effluent solids is essential for practical application. In a batch reactor with the biomass collected from the chemostat, NaAc degradation appeared to be proportional to Cr(VI) reductionwith the ratio of 9 mg C mg(-1) Cr(VI) at 35 degrees C. As reactions proceeded, the oxidation-reduction potential correspondingly decreasedand both pH and alkalinity increased.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 12:20:30