An integrated device for removal of both liquid-containing droplets and pollutants from a gas stream, comprising: a plurality of passageways each having an inlet and an outlet for the flow of a gas stream therethrough, wherein each passageway of said plurality of passageways includes at least one gas perturbation segment configured to perturb the flow of at least a portion of a gas stream between the inlet and the outlet thereof; and a plurality of exposed surface portions, different ones of which are disposed along different ones of said plurality of passageways, each of the plurality of said exposed surface portions comprising a sorbent-polymer-composite material adapted for adsorption of elemental and oxidized mercury vapor; wherein said integrated device is positionable in a gas stream so that liquid-containing droplets present in the gas stream contact and are thereby removed from the gas stream at said exposed surface portions, and mercury vapor molecules present in the gas stream are adsorbed by and affixed within the SPC material of said exposed surface portions; further comprising a plurality of modules (20a, 20b, 20c, 20d, 20e, 60a, 60b) defining said plurality of passageways and said plurality of exposed surface portions, at least two modules (20a, 20b, 60a, 60b) of the plurality of modules (20a, 20b, 20c, 20d, 20e, 60a, 60b) being positionable in adjacent relation in the gas stream for series gas stream flow therethrough, wherein each of said at least two modules (20a, 20b, 60a, 60b) define different parts of each of a first plurality of said plurality of passageways and each of said plurality of modules comprise alternating layers of flat sheets and layers of pleated sheets, such arrangement yielding said plurality of passageways, each of said layers of flat sheets and layers of pleated sheets comprising said sorbent-polymer-composite material, said flat sheets disposed in a substantially parallel relation in a given module (20a, 20b, 60a, 60b), the alternating layers of flat sheets and layers of pleated sheets are arranged in an upright and side-by-side manner and contained in a frame member of a given module, the pleated and flat sheets oriented in perpendicular arrangement to a plane corresponding with open ends of the frame member of a given module, and said layers of flat sheets and layers of pleated sheets in one of the at least two modules are disposed in non-parallel, transverse planes compared to said layers of flat sheets and layers of pleated sheets of the other module of the at least two modules such that parallel layers of flat sheets in a first module lie in corresponding parallel planes that extend along a common first direction, and parallel layers of sheets in a second module lie in corresponding parallel planes that extend along a common second direction, wherein the second direction is different than the first direction. a plurality of passageways each having an inlet and an outlet for the flow of a gas stream therethrough, wherein each passageway of said plurality of passageways includes at least one gas perturbation segment configured to perturb the flow of at least a portion of a gas stream between the inlet and the outlet thereof; and a plurality of exposed surface portions, different ones of which are disposed along different ones of said plurality of passageways, each of the plurality of said exposed surface portions comprising a sorbent-polymer-composite material adapted for adsorption of elemental and oxidized mercury vapor; wherein said integrated device is positionable in a gas stream so that liquid-containing droplets present in the gas stream contact and are thereby removed from the gas stream at said exposed surface portions, and mercury vapor molecules present in the gas stream are adsorbed by and affixed within the SPC material of said exposed surface portions; further comprising a plurality of modules (20a, 20b, 20c, 20d, 20e, 60a, 60b) defining said plurality of passageways and said plurality of exposed surface portions, at least two modules (20a, 20b, 60a, 60b) of the plurality of modules (20a, 20b, 20c, 20d, 20e, 60a, 60b) being positionable in adjacent relation in the gas stream for series gas stream flow therethrough, wherein each of said at least two modules (20a, 20b, 60a, 60b) define different parts of each of a first plurality of said plurality of passageways and each of said plurality of modules comprise alternating layers of flat sheets and layers of pleated sheets, such arrangement yielding said plurality of passageways, each of said layers of flat sheets and layers of pleated sheets comprising said sorbent-polymer-composite material, said flat sheets disposed in a substantially parallel relation in a given module (20a, 20b, 60a, 60b), the alternating layers of flat sheets and layers of pleated sheets are arranged in an upright and side-by-side manner and contained in a frame member of a given module, the pleated and flat sheets oriented in perpendicular arrangement to a plane corresponding with open ends of the frame member of a given module, and said layers of flat sheets and layers of pleated sheets in one of the at least two modules are disposed in non-parallel, transverse planes compared to said layers of flat sheets and layers of pleated sheets of the other module of the at least two modules such that parallel layers of flat sheets in a first module lie in corresponding parallel planes that extend along a common first direction, and parallel layers of sheets in a second module lie in corresponding parallel planes that extend along a common second direction, wherein the second direction is different than the first direction.