Table A: General Chemical Characteristics Characteristic Maximum Remarks in this column are for Concentration guidance only. g/m 3 Dissolved Iron 100 Iron salts may precipitate and cause a sewer blockage. High concentrations of ferric iron may also present colour problems depending on local conditions. Boron - (as B) 25 Boron is not removed by conventional treatment. High concentrations in effluent may restrict irrigation applications. Final effluent use and limits should be taken into account. Bromine - (as Br2) 5 High concentrations of bromine may adversely affect the safety of operations & maintenance personnel. Fluoride - (as F) 30 Fluoride is not removed by conventional wastewater treatment, however pre-treatment can easily and economically reduce concentrations to below 20 g/m³. Cyanide - weak acid dissociable 5 Cyanide may produce toxic (as CN) atmospheres in the sewer and adversely affect the safety of operations & maintenance personnel. Table B: Heavy Metals+ Metal Maximum Remarks in this column are for Concentration guidance only. g/m 3 Antimony 10 Heavy metals have the potential to: Arsenic 5 - impair the treatment process Barium 10 - impact on the receiving environment Beryllium 0.005 - limit the reuse of sludge and Cadmium 0.5 effluent. Chromium 5 Cobalt 10 Copper 10 Lead 10 Manganese 20 Mercury 0.05 Molybdenum 10 Nickel 10 Selenium 10 Silver 2 Thallium 10 Tin 20 Zinc 10 + Heavy metals shall be accepted up to the maximum concentrations given only when specifically approved. Table C: Organic Compounds Compound Maximum Remarks in this column are for Concentration guidance only. g/m 3 Formaldehyde - (as HCHO) 50 Formaldehyde in the sewer atmosphere can adversely affect the safety of operations & maintenance Page 20