About Bahrain Environmental law

1. Annex-III: BAHRAIN INTERIM EFFLUENT GUIDELINES
MAXIMM AVERAGE
PARAMETERS UNITS
PHYSICAL PROPERTIES
Floating Particles mg/m2 0 NIL
pH pH 9 6 to 9
Temperature C CASE BY CASE
Total suspended solids mg/L 35.000 20.000
Turbidity (NTU) N.T.U. 75.000 25.000
INORGANIC CHEMICAL PROPERTIES
Ammonical Nitrogen as N mg/L 3.000 1.000
Dissolved Oxygen mg/L >2
Sulfide as H2S mg/L 1.000 0.500
Chlorine residual mg/L 2.000 0.500
Cyanide as CN mg/L 0.100 0.050
Chloride (Cl-) mg/L TO BE REPORTED
Nitrate (NO3-)-N- mg/L 10.000
Nitrite (NO2-)-N- mg/L 1.000
Phosphorous - Total mg/L 2.000 1.000
M.B.A.S mg/l 1.000 0.500
Fluoride (F-) mg/L 25.000 15.000
ORGANIC POLLUTANTS
Biological Oxygen Demand mg/L 50.000 25.000
Chemical Oxygen Demand mg/L 350.000 150.000
Total Kjeldahl Nitrogen mg/L 10.000 5.000
Hydrocarbons(FLUOR or IR) mg/L 0.100 0.100

2. Oil & Grease (Hexane ex.) mg/L 15.000 8.000
Phenols mg/L 1.000 0.500
TRACE METALS
Aluminium mg/L 25.000 15.000
Arsenic mg/L 0.500 0.100
Cadmium mg/L 0.050 0.010
Chromium Total mg/L 1.000 0.100
Copper mg/L 0.500 0.200
Iron mg/L 10.000 5.000
Lead mg/L 1.000 0.200
Mercury mg/L 0.005 0.001
Nickel mg/L 0.500 0.200
Selenium mg/L 1.000 0.200
Silver mg/L 0.005
Zinc mg/L 5.000 2.000
Total Coliforms No/100 ml 10000.000 1000.000