Parameter CCME China BIS Hong Kong FEPA Mexico Thailand Philippines Indonesia Bangladesh SL pH 6.5-8.5 6-9 5.5-9 6-10 6-9 6-8.5 5-9 6-9 6-9 6.5-9 6-8.5 Temperature (°C) 30 - 50 43 40 - - 40 - 40-45 40 Colour (Pt-Co) 100 80 None 1(Lovibond) 7(Lovibond) - - 100-200 - - 30 TDS mg/L 2000 - 2100 - 2000 - 2000-5000 1200 - 2100 2100 TSS mg/L 40 150 100 800 30 - 30-150 90 60 100 500 Sulphide μg/L 200 1000 2000 1000 200 - - - - 1000 2000 Free Chlorine μg/L 1000 - 1000 - 1000 - - 1000 - - - COD mg/L 80 200 250 2000 80 < 125 120-400 200-300 250 200 600 BOD5 mg/L 50 60 30 800 50 < 30 20-60 30-200 85 150 200 Oil & Grease mg/L - - 10 20 10 - 300 5-15 5 10 30 Dissolved Oxygen μg/L 6000 - - ≧4000 - - - 1000-2000 - 4500-8000 - Nitrate μg/L 13000 - 10000 - 20000 10000 - - - 10000 45000 Ammonia μg/L 0.1 - - 500 0.2 - - - - 5000 60 Phosphate μg/L <4000 1000 5000 5000 5000 - - - 2000 - 2000 Calcium μg/L - - - - 200000 - - 200000 - - 240000 Magnesium μg/L 200000 - - - 200000 - - - - - 150000 Chromium μg/L 1 - 100 100 <100 50 500 50-500 500 2000 50 Aluminium μg/L 5 - - - <1000 5000 - - - - - Copper μg/L <1000 1000 3000 1000 <1000 1000 1000 1000 2000 500 3000 Manganese μg/L 5 2000 2000 500 5.0 200 5000 1000-5000 - 5000 500 Iron μg/L 300 - 3000 1500 20000 1000 - 1000-20000 5000 2000 1000 Zinc μg/L 30 5000 5000 600 <10000 10000 - 5000-10000 5000 5000 10000 Mercury μg/L 0.026 - 0.01 1 0.05 - 5 5 - 10 1 CCME - Canadian Council of Ministers of the Environment BIS - Bureau of Indian Standards FEPA - Federal Environmental Protection Agency (United States) SL - Sri Lanka

Table 31: Discharge limits of various countries [68, 121-131].