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Titolo:
FATE OF DISSOLVED TOLUENE DURING STEADY INFILTRATION THROUGH UNSATURATED SOIL .2. BIOTRANSFORMATION UNDER NUTRIENT-LIMITED CONDITIONS
Autore:
ALLENKING RM; GILLHAM RW; BARKER JF; SUDICKY EA;
Indirizzi:
WASHINGTON STATE UNIV,DEPT GEOL PULLMAN WA 99164 UNIV WATERLOO,WATERLOO CTR GROUNDWATER RES WATERLOO ON N2L 3G1 CANADA
Titolo Testata:
Journal of environmental quality
fascicolo: 2, volume: 25, anno: 1996,
pagine: 287 - 295
SICI:
0047-2425(1996)25:2<287:FODTDS>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
AEROBIC BIODEGRADATION; AQUIFER MATERIAL; HYDROCARBONS; WATER; RATES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
R.M. Allenking et al., "FATE OF DISSOLVED TOLUENE DURING STEADY INFILTRATION THROUGH UNSATURATED SOIL .2. BIOTRANSFORMATION UNDER NUTRIENT-LIMITED CONDITIONS", Journal of environmental quality, 25(2), 1996, pp. 287-295

Abstract

Biotransformation rates for dissolved toluene in unsaturated sandy soil were determined in dynamic column infiltration experiments. Transformation rates under N-limited conditions and in the presence of sufficient oxygen were 8 to 35 mg (kg d)(-1) and appeared to follow zero order kinetics, Toluene-degrading microoganisms were demonstrated to increase significantly in both activity and numbers with exposure to toluene, Relatively low CO2 production tb oxygen consumption ratios were observed during these experiments suggesting incomplete toluene mineralization. Over the ranges tested, water flux (20-80 cm d(-1)) and toluene concentration (4-46 mg L(-1)) appeared to have a secondary control on rate relative to nutrient and/or oxygen limitations, Under conditions where the oxygen concentration was near zero due to removal by toluene degradation in the soil columns, the transformation rate was sufficiently low to be insignificant relative to column residence time.

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Documento generato il 03/12/20 alle ore 05:50:43