FIELD-SCALE STUDIES ON REMOVAL OF CREOSOTE FROM CONTAMINATED SOIL

摘要

The Walker Springs Wood Treating site is an abandoned wood treating facility located near the city of Jackson, Alabama. Site soil was found to be extensively contaminated with creosote oil. Bench-scale studies were conducted to screen soils for creosote-degradative activity and to develop a nutrient recipe that would promote rapid degradation of creosote in pilot-scale and field-scale studies. Screening studies identified a site soil sample which contained microbial populations capable of removing almost 89% of target creosote components in 28 days. Recipes were subsequently developed which promoted the removal of 87% to 90% of target creosote components in 84 days in bench-scale solid-phase studies. In 1997, four pilot-scale land farm cells were constructed with individual capacities of 4.7 yd~3 (3.6 m~3) to evaluate recipes developed from bench-scale studies. Initial creosote concentrations in solid-phase studies ranged from 3,300 to 5,500 mg/kg. One of the recipes promoted the removal of over 94% of target creosote components in 90 days. A field-scale unit was constructed at the site with a capacity of 4,800 yd~3 (3,700 m~3). Almost two years (699 days) were required before creosote component removal achieved the end results obtained in bench-scale and pilot-scale studies.