Fate of dissolved toluene during steady infiltration through unsaturated soil .2. Biotransformation under nutrient-limited conditions

被引：13

作者：

AllenKing, RM ^{[1
]}

Gillham, RW ^{[1
]}

Barker, JF ^{[1
]}

Sudicky, EA ^{[1
]}

机构：

[1] UNIV WATERLOO, WATERLOO CTR GROUNDWATER RES, WATERLOO, ON N2L 3G1, CANADA

来源：

JOURNAL OF ENVIRONMENTAL QUALITY | 1996年 / 25卷 / 02期

关键词：

D O I：

10.2134/jeq1996.00472425002500020012x

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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.

引用

页码：287 / 295

页数：9