Bench Scale Treatability Studies
Geo-Cleanse International, Inc.
currently uses three types of bench scale treatability studies:
GCI maintains a fully equipped and staffed
laboratory that enables us to offer our clientele bench scale
treatability studies. Bench scale studies provide information
about contaminant mass reductions and chemical oxidant efficiencies
that can be incorporated into the design of pilot or full-scale
treatment programs. During the course of all bench scale treatability
studies conducted at GCI, a site-specific catalyst blend is
formulated from information and data obtained from native soils and groundwater. The Site specific
catalyst formulation is necessary to ensure that subsurface
conditions favoring efficient and effective chemical oxidation
can be established and maintained. Bench scale treatability
studies can help to refine costing
for pilot and full-scale chemical oxidation programs.
- Soil and Groundwater Slurries – This
type of bench test is most frequently recommended by GCI.
This type of bench consists of creating several batch “reactors”
made up of equal quantities of site-specific soil and groundwater
(50% soil/water slurry). The reactors are loaded with varying
amounts of oxidant and compared to a zero-oxidant control
reactor to determine the quantity of oxidant that allowed
for the greatest reduction in contaminant concentrations.
- Column Studies – Column studies are
frequently used as a visual demonstration of contaminant
desorption and destruction. This bench involves loading a
clear column with contaminated soils. Catalyst and
oxidant are injected into the column, allowed to react with
the contaminated soils and then collected as leachate. As the oxidant
permeates through the soils, it desorbs and destroys contamination
from the soil. Column studies are best used when contaminants
are visible and strongly sorbed to soil.
- Autoclave Studies – This type of bench
study is a closed system that permits oxidation in each
phase to be accurately measured. A representative soil
sample is put into a sealed vessel that has ports to capture
leachate and offgas. Oxidant and catalyst are injected into
the vessel while PID headspace, carbon dioxide and oxygen
offgas are monitored to determine the progress of the reaction.
When the reaction reaches completion, the soil, leachate,
and offgas are recovered and analyzed to determine the efficiency
of the reaction in each phase.This methodology is best suited for determining an accurate mass balance of oxidant to contaminant ratios.
GCI has completed multiple bench-scale treatment
programs in several states across the country.
To view a representative listing of GCI’s
bench-scale treatement programs, click here.