Organic liquid mobility induced by smoldering remediation

Area of Science:

• Environmental Engineering
• Chemical Engineering
• Thermal Treatment Processes

Background:

• Smoldering is an emerging, energy-efficient thermal treatment for organic liquid waste.
• Understanding factors influencing smoldering behavior is crucial for optimizing its application.

Purpose of the Study:

• To investigate the potential for downward organic liquid mobilization during smoldering.
• To identify conditions promoting or inhibiting this migration.
• To assess the impact of migration on smoldering efficiency.

Main Methods:

• Laboratory-scale column experiments.
• Analytical modeling.
• Numerical simulations.

Main Results:

• Downward organic liquid migration was observed under specific conditions.
• Migration occurred when air flux was low (<3 cm/s), systems were tall (90 cm), and liquids were temperature-sensitive.
• Peak temperatures increased by up to 35% and treatment times by up to 30% due to migration.
• An analytical equation was developed to predict the air flux needed to prevent migration.

Conclusions:

• Organic liquid migration can occur during smoldering, affecting thermal parameters.
• Smoldering treatment remains effective in waste destruction despite liquid migration.
• Findings are critical for designing effective field applications of smoldering waste treatment.