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where DisposalCost = mvoc = ΞΈs = Dvoc = E = Disposal Cost ($/yr) VOC inlet loading (lbs/h) System operating hours (h/yr) Disposal costs for the recovered VOC ($/lb) Adsorber VOC control efficiency 1.8.4 Total Annual Cost Finally, as explained in Section 1, the total annual cost (TAC) is the sum of the direct and indirect annual costs and disposal cost, less any recovery credits, or: where DAC = IAC = Disposalcost = RC = 1.8.5 Cost Effectiveness TAC = DAC + IAC + Disposalcost - RC Direct annual costs, Indirect annual costs, Costs for disposing or otherwise treating recovered VOC, and Recovery credit. (1.41) The cost in dollars per ton of VOC removed per year, is calculated using equation 1.42: πΆππ π‘ πΈπππππ‘ππ£ππππ π = ππ΄πΆ (1.42) πππΆ π ππππ£ππ/π¦π where Cost Effectiveness = the cost effectiveness, $/ton VOC Removed/year = annual mass of VOC removed by the carbon adsorber, tons/year 1.9 Example Problem An example problem that calculates both the design parameters and capital and annual costs for a carbon adsorber applied to a printing plant is presented below. The printing plant will operate continuously for 360 days/year and emit 100 lb/hour of toluene. The waste gas is expected to contain negligible quantities of particulate matter and moisture. The plant proposes to use a carbon adsorber that consists of three beds, with two carbon beds adsorbing VOC, while the third bed is desorbing or on standby. Each carbon bed will be housed in a metal vessel made with 304 stainless steel. No additional site preparation or building modifications are necessary for the installation of the new adsorber. The toluene will be recovered and sold to a solvent recycling company. 1-34PDF Image | Carbon Adsorbers
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