Guidelines Wastewater guidelines Part of the study involves a review of the environmental standards that provides a basis for monitoring and future audits. The table below presents recommended guidelines on wastewater quality for discharge into the public sewers and open water bodies. 24: Kenya discharge Guidelines for Waste water Standards for Discharge into public sewers (mg/l) PARAMETER Maximum levels Suspended 250 solids (mg/L) Total dissolved 2000 solids (mg/L) Temperature 20 - 35 pH 0C 6-9 Oil and Grease 10 (mg/L) -where conventional Oil and 5 treatment shall Grease beused (mg/L)- where Ammonia 20 ponds is a final Nitrogen (mg/L) Substances Shall not be treatment with an discharged method obnoxious into the Biological 500 Oxygen sewers Chemical 1000 Demand Oxygen BOD5 Arsenic (mg/L) 0.02 days Demand at 20 COD oC Mercury (mg/L) 0.05 (mg/L) (mg/L) Lead (mg/L) 1.0 Cadmium 0.5 (mg/L) Chromium VI 0.05 (mg/L) Chromium 2.0 (Total) (mg/L) Copper (mg/L) 1.0 Zinc (mg/L) 5.0 Selenium 0.2 (mg/L) Nickel (mg/L) 3.0 Nitrates (mg/L) 20 Phosphates 30 (mg/L) Cyanide Total 2 (mg/L) Sulphide 2 (mg/L) Phenols (mg/L) 10 Detergents 15 (mg/L) Colour Less than Mercury 40 Not Hazen units Detectable Free and saline 4.0 Ammonia as N (nd) Calcium Nil (mg/L) Carbide Chloroform Nil Inflammable Nil solvents
Guidelines Wastewater guidelines Part of the study involves a review of the environmental standards that provides a basis for monitoring and future audits. The table below presents recommended guidelines on wastewater quality for discharge into the public sewers and open water bodies. 24: Kenya discharge Guidelines for Waste water Standards for Discharge into public sewers (mg/l) PARAMETER Maximum levels Suspended solids (mg/L) 250 Total dissolved solids (mg/L) 2000 Temperature 0C 20 - 35 pH 6-9 Oil and Grease (mg/L) -where conventional treatment shall beused 10 Oil and Grease (mg/L)- where ponds is a final treatment method 5 Ammonia Nitrogen (mg/L) 20 Substances with an obnoxious Shall not be discharged into the sewers Biological Oxygen Demand BOD5 days at 20 oC (mg/L) 500 Chemical Oxygen Demand COD (mg/L) 1000 Arsenic (mg/L) 0.02 Mercury (mg/L) 0.05 Lead (mg/L) 1.0 Cadmium (mg/L) 0.5 Chromium VI (mg/L) 0.05 Chromium (Total) (mg/L) 2.0 Copper (mg/L) 1.0 Zinc (mg/L) 5.0 Selenium (mg/L) 0.2 Nickel (mg/L) 3.0 Nitrates (mg/L) 20 Phosphates (mg/L) 30 Cyanide Total (mg/L) 2 Sulphide (mg/L) 2 Phenols (mg/L) 10 Detergents (mg/L) 15 Colour Less than 40 Hazen units Mercury Not Detectable (nd) Free and saline Ammonia as N (mg/L) 4.0 Calcium Carbide Nil Chloroform Nil Inflammable solvents Nil