EPA 540-R-95/536
DARAMEND™ Bioremediation Technology GRACE Bioremediation Technologies
This document is available in the Adobe Acrobat PDF
Format.
Click here
for information about Portable Document File (PDF) Formats.
or
Click here
to directly download the Acrobat Reader.
(To view the PDF, it is recommended that you
use the latest version of Acrobat Reader.)
DARAMEND™ Bioremediation Technology GRACE Bioremediation
Technologies (96K)
ABSTRACT
DARAMEND™ Bioremediation Technology
GRACE Bioremediation Technologies
Innovative Technology Evaluation Report
EPA 540-R-95/536
July 1996
Grace Dearborn's DARAMEND Bioremediation Technology was developed to treat
soils/sediment contaminated with organic contaminants using solid-phase
organic amendments. The amendments increase the soil's ability to supply
biologically available water/nutrients to microorganisms and bind pollutants
to reduce the acute toxicity of the soil's aqueous phase. Prior to technology
application, soils are screened approximately to 10 cm in diameter to
remove any debris. The technology can be applied either in-situ or ex-situ.
Application involves the mixing of soils with amendments to a depth of
0.6m. Amended soils are then irrigated/tilled to encourage microbial growth
and metabolic activity until target compounds are reduced below regulatory
action levels. A soil cover may be used to control soil moisture and run-on/off.
The soil cover also has the effect of maintaining elevated soil temperatures
negating the usual problems experienced when applying bioremediation systems
in cold climates. This technology was demonstrated at the Domtar Wood
Preserving Facility, Trenton, Ontario, Canada, during an eleven-month
period from October 1993 to September 1994 using soil contaminated with
polyaromatic hydrocarbons (PAH) and chlorinated phenols. The developers
claimed 95% reduction in total PAHs and total chlorophenols. Demonstration
soil sampling revealed that PAH's were reduced from 1,710 mg/kg to 98
mg/kg (94.3%), total chlorophenols were reduced from 352 mg/kg to 43 mg/kg
(87.8%), and total recoverable petroleum hydrocarbons were reduced from
7,300 mg/kg to 932 mg/kg (87.3%). The technology also reduced soil toxicity
to earthworms and plant seeds.
Back to SITE Home Page
Posted February 26, 1999
|
