![]() ![]() Organic compounds released by microorganisms can compete for sorption sites, similar to DOM. Regeneration of AC with persulfate can increase the polar functional groups that contain oxygen on the surface, reducing adsorption capacity. Chemical and biological processes can also alter the AC, potentially reducing adsorption capacity. The large adsorption capacity of AC is due to its highly porous internal structure and is influenced by many factors, including solution chemistry and presence of co-contaminants or dissolved organic matter (DOM) that compete for sorption sites. Adsorption is reversible under typical subsurface conditions, so contaminants may be released if water chemistry changes or competing solutes are present. Sorption increases the residence time of contaminants within the reactive zone and therefore also increases contact with the reactive amendments, which has the potential to promote contaminant degradation.Ĭommon organic contaminants are sorbed by AC mainly through van der Waals forces. As contaminated groundwater flows through this zone, the contaminants are retarded due to adsorption on to activated carbon. CLU-IN Technology Focus Area: Activated Carbon-Based Technology for In Situ RemediationĪC-based remediation involves in situ emplacements of AC-based amendments in the subsurface to form an adsorptive/reactive zone for contaminant remediation.Remedial Technology Fact Sheet - Activated Carbon-Based Technology for In Situ Remediation.2.2 Effects of Activated Carbon on Degradation.
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