Effects of Cosolvent Additions on the Biodegradability of High Molecular Weight PAH Compounds in Soil

EPA Contract Number: 68D10057
Title: Effects of Cosolvent Additions on the Biodegradability of High Molecular Weight PAH Compounds in Soil
Investigators: Dobbins, Durell C.
Small Business: BioTrol Inc.
EPA Contact: Manager, SBIR Program
Phase: I
Project Period: September 1, 1991 through March 1, 1992
Project Amount: $49,550
RFA: Small Business Innovation Research (SBIR) - Phase I (1991) RFA Text |  Recipients Lists
Research Category: SBIR - Waste , Hazardous Waste/Remediation , Small Business Innovation Research (SBIR)


Addition of cosolvents to water increases the solubility of hydrophobic contaminants by shifting the adsoption equi- librium to favor higher aqueous phase concentrations. In- creasing their water solubility makes contaminants more accessible for biodegradation. While it is often speculated that low rates or lack of biodegradation is caused by low aqueous solubility, no studies have been performed to date to determine whether cosolvents can elicit a biodegadation response in samples that were presumably sorption limited. The proposed study will determine the effects of cosolvents on biodegradation of high molecular weight polynuclear aromatic hydrocarbons in samples where no biodegradation was previously observable, presumably due to organic- phase partitioning. The results of the study will theoreti- cally provide a new cosolvent-enhanced bioremediation procedure that is economically advantageous over alterna- tive technologies where bioremediation alone is inadequate to achieve assigned cleanup criteria.

Supplemental Keywords:

Scientific Discipline, Waste, Water, Contaminated Sediments, Remediation, Environmental Chemistry, Chemistry, Microbiology, Environmental Microbiology, Bioremediation, Biology, Hazardous, Engineering, Chemistry, & Physics, Superfund site remediation, biodegradability, hazardous waste treatment, Superfund sites, in situ remediation, biodegradation, cleanup, PAH, hazardous waste, Superfund, soils, hazardous waste cleanup, in situ bioremediation, in-situ bioremediation, soil, superfund site, PAHs, hazardous wate, hazardous waste site, hazardous waste sites, cosolvent systems

Progress and Final Reports:

  • Final