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i$+ !. H. KLEINFELDER &ASSOCIATES Air emissions can be controlled through vapor-phase carbon adsorption, This may be required by regulatory agencies dependent upon emission concentrations. In this manner, the environmental and public health are protected from potentially harmful airborne contaminants. [A Air stripping system effluent quality can be enhanced by liquid phase carbon adsorption. Once the majority of hydrocarbon contamination has been removed through air stripping, the remaining constituents can be reduced to acceptable levels via liquid phase carbon adsorption. f.a COST SCREENING The air stripping technique, as a stand-alone system, offers. relativeZy low capital investment yet much higher O&M cost. This is primarily due to high utility costs to operate the system_ Capital costs will increase with higher efficiency speci€ications. Capital and 0&h] casts increase substantially if carbon adsorption is used to augment the air stripping system. In addition to design and construction costs, costly periodic carbon regeneration or replacement is f , required. !k4. 3.6.3 CAFMON ADSORPTION E Numerous case histories have documented carbon adsorption as an effective Cx Y remedial technique for the treatment of hydrocarbon contaminated ground x water. This technique employs granular activated carbon (GAC) as a medium a for adsorption of VOC's (see Figure 3.6.5). The effectiveness of this i technique depends primarily on . adsorbability of the carbon per constituent. The adsorbability is related to the solubility of the contaminant in water and as such decreases with increased solubility. To ensure effective removal of most hydrocarbon constituents, several fat least two) GAC units are constructed in-line. if breakthrough occurs in . the first GAC unit, the next unit in line will become the prime treatment �. 33-87-887 lb ;