Table 1: Environmental Protection Standards for Nitrogen Fertiliser Plants
  Concentration in Effluents Not to Exceed Indicated Milligrams per Litre (except for pH)
 

Plants Commissioned after January 1, 1982

Plants Commissioned prior to  January 1, 1982

Liquid Effluents
a. Straight Nitrogen Fertilisers, excluding Calcium Ammonium Nitrate and Ammonium Nitrate
pH 6.5 - 8.0 6.5 - 8.0
Ammoniacal Nitrogen 50 75
Total Kjeldahl Nitrogen 100 150
Free Ammoniacal Nitrogen 4 4
Nitrate Nitrogen as N 10 10
Cyanide as CN 0.2 0.2
Vanadium as V 0.2 0.2
Arsenic as As 0.2 0.2
Suspended Solids 100 100
Oil and Grease 10 10
Hexavalent Chromium as Cra 0.1 0.1
Total Chromium as Cra 2.0 2.0
     
b. Calcium Ammonium Nitrate and Ammonium Nitrate Concentration of all parameters in the effluents remain same as  above except nitrate nitrogen . Concentration of Nitrate Nitrogen in the effluent not to exceed 20 milligrams per litre N.
  Prilling tower commissioned after January 1982 Prilling tower commissioned prior to January 1982
Gaseous Emmissions
Urea (Particulate emmissions) 50 mg per normal cubic meter (0.5 kg per tonne urea) 150 mg per normal cubic meter (2.0 kg per tonne urea)
  • At outlet of Chromate removal unit.

     


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