SIMULATING TRANSPORT AND REMOVAL OF XYLENE DURING REMEDIATION OF A SANDY AQUIFER

被引:36
作者
SCHAFER, W [1 ]
THERRIEN, R [1 ]
机构
[1] UNIV LAVAL, DEPT GEOL & GENIE GEOL, QUEBEC CITY, PQ G1K 7P4, CANADA
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/0169-7722(95)00018-Q
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Xylene, originating from a spill, is present both as a nonaqueous-phase liquid (NAPL) at residual saturation near the water table, and as a dissolved groundwater component contaminating a sandy aquifer beneath an abandoned refinery. Three remediation wells are in operation on the site to prevent further xylene migration in the groundwater. Field observations indicate that microbially-mediated xylene degradation and oxygen and nitrate reduction occur in the aquifer. To realistically simulate dissolved xylene migration at this site, a three-dimensional numerical flow and transport model incorporating biochemical multispecies interactions and xylene dissolution from the NAPL has been developed. In the calibration process the variable contact area between the NAPL and groundwater and the vertical transverse dispersivity were identified as crucial parameters controlling the fate of xylene. The simultaneous modeling of a whole set of related reactive species made it also possible to quantify the observed biodegradation. Results indicate that it contributes in the same order of magnitude to total xylene removal than does extraction by the wells. The calibrated model will be used to assist in the design of an in situ bioremediation scheme, where biodegradation in the aquifer is enhanced by injection of an electron acceptor.
引用
收藏
页码:205 / 236
页数:32
相关论文
共 44 条
[1]   MODELING STEADY-STATE METHANOGENIC DEGRADATION OF PHENOLS IN GROUNDWATER [J].
BEKINS, BA ;
GODSY, EM ;
GOERLITZ, DF .
JOURNAL OF CONTAMINANT HYDROLOGY, 1993, 14 (3-4) :279-294
[2]   TRANSPORT OF DISSOLVED HYDROCARBONS INFLUENCED BY OXYGEN-LIMITED BIODEGRADATION .2. FIELD APPLICATION [J].
BORDEN, RC ;
BEDIENT, PB ;
LEE, MD ;
WARD, CH ;
WILSON, JT .
WATER RESOURCES RESEARCH, 1986, 22 (13) :1983-1990
[3]   INSITU MEASUREMENT AND NUMERICAL-SIMULATION OF OXYGEN LIMITED BIOTRANSFORMATION [J].
BORDEN, RC ;
LEE, MD ;
THOMAS, JM ;
BEDIENT, PB ;
WARD, CH .
GROUND WATER MONITORING AND REMEDIATION, 1989, 9 (01) :83-91
[4]   TRANSPORT OF DISSOLVED HYDROCARBONS INFLUENCED BY OXYGEN-LIMITED BIODEGRADATION .1. THEORETICAL DEVELOPMENT [J].
BORDEN, RC ;
BEDIENT, PB .
WATER RESOURCES RESEARCH, 1986, 22 (13) :1973-1982
[6]   SIMULATION OF CONTAMINANT TRANSPORT IN 3 DIMENSIONS .2. DIMENSIONALITY EFFECTS [J].
BURNETT, RD ;
FRIND, EO .
WATER RESOURCES RESEARCH, 1987, 23 (04) :695-705
[7]   KINETICS OF NUTRIENT-LIMITED TRANSPORT AND MICROBIAL-GROWTH [J].
BUTTON, DK .
MICROBIOLOGICAL REVIEWS, 1985, 49 (03) :270-297
[8]   AEROBIC BIODEGRADATION OF BENZENE, TOLUENE, AND XYLENE IN A SANDY AQUIFER - DATA-ANALYSIS AND COMPUTER MODELING [J].
CHIANG, CY ;
SALANITRO, JP ;
CHAI, EY ;
COLTHART, JD ;
KLEIN, CL .
GROUND WATER, 1989, 27 (06) :823-834
[9]   SOLUTE TRANSPORT IN HETEROGENEOUS POROUS FORMATIONS [J].
DAGAN, G .
JOURNAL OF FLUID MECHANICS, 1984, 145 (AUG) :151-177
[10]  
DIERSCH HJ, 1984, CONTAMINANT PLUME MI