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Titolo:
ACCUMULATION OF METABOLIC INTERMEDIATES DURING SHOCK LOADS IN BIOLOGICAL FLUIDIZED-BED REACTORS
Autore:
ZHAO XD; DOH K; CRIDDLE CS; VOICE TC;
Indirizzi:
MICHIGAN STATE UNIV,DEPT CIVIL & ENVIRONM ENGN E LANSING MI 48824
Titolo Testata:
Journal of environmental engineering
fascicolo: 12, volume: 123, anno: 1997,
pagine: 1185 - 1193
SICI:
0733-9372(1997)123:12<1185:AOMIDS>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVATED CARBON; BACTERIAL METABOLISM; META-XYLENE; OXIDATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
X.D. Zhao et al., "ACCUMULATION OF METABOLIC INTERMEDIATES DURING SHOCK LOADS IN BIOLOGICAL FLUIDIZED-BED REACTORS", Journal of environmental engineering, 123(12), 1997, pp. 1185-1193

Abstract

Groundwater containing benzene, toluene, and p-xylene (BTX) was treated in fluidized bed reactors using nonactivated carbon (FBR) and activated carbon (BAC-FBR) as the biofilm carriers. BTX removal and accumulation of metabolic intermediates were studied at steady state and during single-substrate step-loading increases. At steady state (organic loading rate of 2.2 kg-COD/m(3)-d), no intermediates were detected in the effluents. However, intermediates were found in the effluents of both systems during a sevenfold p-xylene step increase under different supply levels of dissolved oxygen (DO) and nutrients. Intermediate concentrations increased with increasing dissolved oxygen in the influent but were not affected by the level of nutrients. The accumulation of intermediates was also evaluated quantitatively by subjecting both reactor systems to 20-, 12-, and 7-fold step increases in the organic loading rates of benzene, toluene, and p-xylene, respectively. In all of the step increase experiments, the effluent intermediate concentrationswere less for the BAC-FBR than for the FBR system. We conclude that the combination of biological and adsorptive removal mechanisms in the BAC-FBR resulted in enhanced removal of both BTX and metabolic intermediates under shock-load conditions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/01/20 alle ore 14:45:54