SITE demonstration of the CF systems organic extraction process

Area of Science:

• Environmental Engineering
• Chemical Engineering
• Environmental Science

Background:

• New Bedford Harbor harbors significant Polychlorinated Biphenyl (PCB) contamination in its dredged sediments.
• Remediation of contaminated sediments is crucial for ecosystem and public health.
• Innovative technologies are sought for efficient and cost-effective hazardous waste management.

Purpose of the Study:

• To evaluate the performance of the CF Systems Organic Extraction Process for PCB removal from contaminated sediments.
• To present findings from a field demonstration conducted under the EPA's Superfund Innovative Technology Evaluation (SITE) program.
• To assess the efficiency, operational challenges, and cost-effectiveness of the organic extraction technology.

Main Methods:

• Utilized the CF Systems Organic Extraction Process, employing liquefied propane as the solvent.
• Conducted a field demonstration on sediment dredged from New Bedford Harbor.
• Monitored PCB removal efficiencies and documented operational parameters and challenges.

Main Results:

• The organic extraction process achieved PCB removal efficiencies exceeding 70% across all test runs.
• Operational issues were encountered during the demonstration, potentially impacting overall efficiency.
• Significant quantities of residues were generated during the process.
• Estimated costs for the process range from $150 to $450 per ton.

Conclusions:

• The CF Systems Organic Extraction Process shows promise for removing PCBs from contaminated sediments.
• Further optimization may be needed to address operational challenges and residue generation.
• The technology presents a viable, albeit potentially costly, option for PCB remediation projects.