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Resources Conservation Company
B.E.S.T.® Solvent Extraction Technology
This document is an evaluation of the performance of
the Resources Conservation Company (RCC) Basic Extractive Sludge Treatment
(B.E.S.T.® ) solvent extraction technology and its applicability as
a treatment technique for soils, sediments, and sludges contaminated with
organics. Both the technical and economic aspects of the technology are
A demonstration of the RCC B.E.S.T.® solvent extraction system was conducted from July 1, 1992 to July 22,1992 using
RCC's pilot-scale unit to treat two composited sediments (Sediment A and Sediment B) collected from the Grand
Calumet River. Operational data and sampling and analysis information were carefully compiled to establish a database
against which other available data, as well as the vendor's claims for the technology, could be compared and evaluated.
Conclusions were reached concerning the technology's suitability for use in removing organic contaminants from sediment.
The following conclusions are based on the demonstration test results collected by the Superfund Innovative Technology
Evaluation (SITE) Program and supported by other available data, including demonstration test data collected by RCC:
- Contaminant concentration reductions of 96 percent for total polynuclear aromatic
hydrocarbons (PAHs) and greater than 99 percent of total polychlorinated
biphenyls (PCBs) were achieved for Sediment A. Contaminant concentration
reductions of greater than 99 percent for total PAHs and greater than
99 percent for total PCBs were achieved for Sediment B.
- Removal efficiencies in excess of 98 percent were realized for both sediments
for oil and grease.
- Mass balances conducted for total materials (including triethylamine)
in the B.E.S.T.® system achieved closures of 99.3 percent and 99.6
percent for Sediment A and Sediment B, respectively. Mass balances comparing
feed and product streams (excluding triethylamine) achieved closures of
108 percent and 114 percent for Sediment A and Sediment B, respectively.
- The products generated using the B.E.S.T.® process compared favorably
with RCC's claims with regard to residual triethylamine concentrations.
Treated solids produced during the optimum treatment runs for Sediment
B had an average triethylamine concentration of 103 mg/kg. Water generated
during these runs had a triethylamine concentration of 2.2 mg/L or less,
while the oil product collected at the end of all Sediment B treatment
runs had a triethylamine concentration of 733 mg/kg. Because very little
oil product was generated during the treatment of Sediment A, the Sediment
A oil product was not processed to reduce its triethylamine concentration.
Solid product generated from the optimum treatment runs for Sediment A
realized an average residual concentration of 45.1 mg/kg, while water
products from the optimum treatment runs for Sediment A had triethylamine
concentrations of 1.0 mg/L or less.
- The treatment cost for the remediation of contaminated soil, sediment, or sludge using the proposed l86-ton-perday,
full-scale B.E.S.T.® system is estimated at $94 per ton if the system is on line 80 percent of the time or $112
per ton if the system is on line 60 percent of the time.