Activated Carbon Immobilizes Residual Polychlorinated Biphenyls in Weathered Contaminated Soil

Abstract

Activated carbon (AC) has recently been shown to be effective in sequestering persistent organic pollutants (POPs) from aquatic sediments. Most studies have demonstrated significant reductions of POP concentrations in water and in aquatic organisms; however, limited data exist on the possibility of using AC to immobilize remaining POPs at terrestrial contaminated sites. Under greenhouse conditions, pumpkin ssp cv. Howden) were grown, and red wiggler worms () were exposed to an industrial contaminated soil containing a mixture of polychlorinated biphenyls (PCBs), i.e., Aroclors 1254 and 1260) treated with one of four concentrations of AC (0.2, 0.8, 3.1, and 12.5%) for 2 mo. The addition of AC to contaminated soils virtually eliminated the bioavailability of PCBs to the plant and invertebrate species. There were reductions in PCB concentrations of more than 67% in ssp and 95% in . These data suggest that AC could be included as part of comprehensive site closure strategy at PCB-contaminated sites.

Reduction of chlordecone environmental availability by soil amendment of biochars and activated carbons from lignocellulosic biomass

“…Several studies have proven that AC and biochar application to soils was able to significantly limit organic pollutants transfer to biota (Ghosh et al 2011). As an example, reduction levels up to 94% of pollutant transfer were reported on earthworms when using ACs (Denyes et al 2012(Denyes et al , 2013Langlois et al 2011;Paul and Ghosh 2011;Wang et al 2012). The results of the present study confirm the adequacy of this sequestration strategy for CLD-contaminated soils (Delannoy et al 2018).…”

Amendment of soil by biochars and activated carbons to reduce chlordecone bioavailability in piglets

“…AC application is known to limit organic pollutant transfer to different biota (Ghosh et al, 2011). The same range of reduction factor was also reported from soil studies, but to our knowledge these latter only focused on invertebrates and mostly earthworms as the model organism (Denyes et al, 2013, Denyes et al, 2012, Langlois et al, 2011, Paul and Ghosh, 2011, Wang et al, 2014. As an illustration (Paul and , measured 94% bioaccumulation reduction of PCB from an artificially contaminated soil following earthworm (Eisenia fetida) exposure during 28 days to ∼ 2.1% (w/w) AC amendment.…”

Kinetic Modelling and Half Life Study of Adsorptive Bioremediation of Soil Artificially Contaminated With Bonny Light Crude Oil

“…Activated or nonactivated charcoals have been shown to reduce phytotoxicity of many herbicide residues and other chemicals in agricultural soils [Strek et al, 1981;Mukhin et al, 1995], reduce hydrophobic organic pollutant leaching , pollutant loss to the atmosphere [Bushnaf et al, 2011], and uptake from soil by plants [Vasilyeva et al, 2010;Jakob et al, 2012], and earthworms [Langlois et al, 2011]. However, replacing coalderived activated carbon with biochar is motivated by the successful use of coal-derived activated charcoals for the in-situ sequestration of hydrophobic organic compounds (HOCs) [Ghosh et al, 2011] and thus would reduce economic costs and improve the sustainability of remediation efforts [Sparrevik et al, 2011].…”