El medio ambiente en la minería

125 T. KIMURA & H. KUROKAWA Table 1. Environmental Standards on air and water Item Regulations Value SOa :s 0.04 ppm 1hour value of daily average ~ 0.1 ppm 1hour value at any time CO ~ 10 ppm 1 hour va/ue of dally average ~ 20 ppm 1 hour va/ue of 8 hours average Air Suspended Salid S 0.1 mg/m 3 1 hour value of dally average Particles S 0.2 mg/m 3 1 hour value at any time No,.. 0.04 ppm ~ 0.06 ppm or S 0.04 ppm 1hour vaJue of dally average Photochemical S 0.06 ppm 1hour va/ue at any time Oxidant Ce! < 0.01 ppm CN 1- - should not be detected P(organie) - should not be detected Pb S 0.1 ppm Water er 6 + S 0.05 ppm As S 0.05 ppm Total Hg . S 0.0005 ppm AlkyI Hg - should not be detected PCS - should not be detected Emission 01 SOx The SOx emission is prescribed by two regulations, a "K" value regulation and a total SOX emission reguladon. The "K" value regulation is applied to every stack and the SOx emission allowance in each stack is regulafoo by the following formula, based on the Bonsanquet-Sutton equation. ["K" value regulation] q S K . 10- 3 • He 2 Here q SOxemission (Nm 3 jH) K "K" value, the value is determined by the local government He: Effective stack height (m) where the "Kit value applied to the Niihama area is 3.5 for existing facilities built before 1974 and 2.34 for newer facilities established after 1974.