In: Civil Engineering
Your firm has been asked to evaluate the "risk" of removing drums of acid from a waste lagoon that contains cyanide. The following data have been provided to you: Volume of air in which occupants live = 1 X 108 m3 Wind speed = calm Number of drums = 10 Volume of each drum = 0.02m3 Contents of drums: HCl at a concentration of 10% by mass Anticipated reaction : HCl + NaCN --> HCN(g) + NaCl RfC for HCN = C X 10 -3 mg . m-3 Assuming 100% of the HCl will react from HCN, estimate the hazard index and indicate whether or not the residents should be evacuated while the drums are being removed.