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at a metal plating plant has a floor area of 2 x 104 m2 and a ceiling Some of the metals that will be used in the plating operations are known to as an impurity. The health and safety engineer at the plant is currently 5. The processing room height of 6 m. contain arse concerned that as metals are heated during the plating process arsenic vapors will be released into the work area. A preliminary estimate for the arsenic release rate is given as 3.5 mg/hr nic a. Draw a diagram b. Write the mass balance equation that you would use to analyze the problem c. If the plating processing room is currently ventilated at a rate of 2 air exch hour, what would be the steady-state concentration of arsenic in mg/m? Ans b) 0.0145 ug/m Mass Balance: Well-Mixed Systems Simple "Box Mode Q c V C Note: for a well-mixed system, CoutC s (or QwCw) Mass Rate Gain / Loss Change im Mass per Time A(V.C) Mass Rate Mass Rate In Out by Reaction ΔΙ ion and Meteorology Simple "Box" Model Q Cin Q C S (or QwOw) where Q is given as: Volumetric flow rate (Q) Windspeed x cross-sect. area (Q = uA) Air change rate x Volume (Q ACR V) Ventilation Rate (u-h) x Width 02013 Kevin J. Farley

Answer 1

(en Ain change sate = enRoun So Gary (a) Since Assenic Vaboun genenvaches imside So S=3.59mg /Rm oSineOy ai entens dnom oudside So cnly gemenatel Assen ic vato ω.jj be considesed aga assi Also since sgenic (b) mass balance since Cir o Soq.cin=o, SIC ,V = O don sheudy state AVC) nom mass balance eguation 3.524 1o3xcs , uRene s is steady state concentsation 3- 5 Ang