Adsorption and transport of XXXX in biochars derived from waste wood.

@entity505 @entity577 @entity578
UNASSIGNED: Mitigation of landfill gas (LFG) is among the critical aspects considered in the design of a landfill cover in order to prevent atmospheric pollution and control global warming. In general, landfill cover soils can partially remove @entity577 ( @entity578 ) through microbial oxidation carried out by methanotrophic bacteria present within them. The oxidizing capacity of these landfill cover soils may be improved by adding organic materials, such as biochar, which increase adsorption and promote subsequent or simultaneous oxidation of @entity578 . In this study, seven wood-derived biochars and granular activated @entity505 (GAC) were characterized for their @entity578 adsorption capacity by conducting batch and small-scale column studies. The effects of influential factors, such as exposed @entity578 concentration, moisture content and temperature on @entity578 adsorption onto biochars, were determined. The @entity578 transport was modeled using a 1-D advection-dispersion equation that accounted for sorption. The effects of LFG inflow rates and moisture content on the combined adsorption and transport properties of biochars were determined. The maximum @entity578 adsorption capacity of GAC (3.21mol/kg) was significantly higher than that of the biochars (0.05-0.9mol/kg). The @entity578 gas dispersion coefficients for all of the biochars ranged from 1*10(-3) to 3*10(-3)m(2)s(-1). The presence of moisture significantly suppressed the extent of @entity577 adsorption onto the biochars and caused the @entity577 to break through within shorter periods of time. Overall, certain biochar types have a high potential to enhance @entity578 adsorption and transport properties when used as a cover material in landfills. However, field-scale studies need to be conducted in order to evaluate the performance of biochar-based cover system under a more dynamic field condition that captures the effect of seasonal and temporal changes.
