Table 2:  Environmental Protection Standards for Phosphate Fertiliser Plants
  Concentration in Effluents Not to Exceed Indicated Milligrams per Litre (except for pH)
Liquid Effluents
a. Straight Phosphate Fertilisers
  pH 7.0-9.0
Phosphate as P 5
Oil and Grease 10
Suspended Solids 100
Fluoride as Fa 10
Hexavalent Chromium as Crb 0.1
Total Chromium as Crb 2.0
b. Complex Fertilisers

Plants Commissioned after January 1, 1982

Plants Commissioned prior to  January 1, 1982

  pH 0.5 - 8.0 0.5 - 8.0
Ammoniacal Nitrogen 50 75
Free Ammoniacal Nitrogen 4 4
Nitrate Nitrogen as N 100 150
Cyanide as CN 10 10
Vanadium as V 0.2 0.2
Arsenic as As 0.2 0.2
Phosphate as P 0.2 0.2
Oil and Grease 5 5
Suspended Solids 10 10
Fluoride as Fa 150 150
Hexavalent Chromium as Crb 0.1 0.1
Total Chromium as Crb 2.0 2.0
c. Complex Fertilisers including Ammonium Phosphate and Nitro Phosphate  Concentration of all parameters in the effluents remain same as  above except nitrate nitrogen in the effluent not to exceed 20 milligrams per litre N.
Gaseous Emmissions
a. Phosphate fertilisers, Phosphoric acid manufacturing, mixing and grinding of Phosphate rock, and granulations. 25 milligrams per normal cubic meter as total fluoride as F.
150 milligrams particulate per normal cubic metre
b. Nitric acid (emissions of Oxides of Nitrogen) 3 kilograms of oxide of Nitrogen as NOx per mt of weak Nitric acid produced.
c. Sulphuric Acid (Emission of Sulphur Dioxide as Acid Mist) 4 kilograms as SO2 per mt of concentrated (100%) acid produced 
50 milligrams acid mist per normal cubic meter
  • At outlet of Fluoride removal unit. If the process demands, Fluoride as F shall be limited to
    1.5 mg / L

  • At outlet of Chromate removal unit.

     


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