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Union of India - Section

Section 82 in The Environment (Protection) Rules, 1986

82. Environmental Standards for Gas/Naptha-based Thermal Power Plants

(i)Limit for emissions of NOx
(a)For existing units-150ppm (v/v) at 15 Per cent excess oxygen.
(b)For new units with effect from 1.6.1999.
Total generation of gas turbine Limit for Stack NOx emission [v/v), at 15% excess oxygen]
(a)400 MW and above (i) 50 ppm for the units burning natural gas
  (ii) 100 ppm for the units burning naphtha.
(b) Less than 400MW but Upto 100 MW (i) 75 ppm for the units burning natural gas.
  (ii) 100 ppm for the units burning naphtha
(c) Less than 100 MW 100 ppm for units burning natural gas or naphtha as fuel
(d) For the plants burning gas in a conventional boiler. 100 ppm
(ii)Stack height H in m should be calculated using the formula H-14Q0.3, where Q is the emission rate of SO2 in kg/hr, subject to a minimum of 30 mts.
(iii)Liquid waste discharge limit
Parameter Maximum limit of concentration (mg/1 except for pH and temperature)
2 3
pH 6.5-8.5
Temperature As applicable for other thermal power plants.
Free available chlorine 0.5
Suspended Solids 100.0
Oil and grease 20.0
Copper (total) 1.0
Iron (total) 1.0
Zinc 1.0
Chromium (Total) 0.2
Phosphate 5.0
[***] [Serial No. 83 omitted by G.S.R. 371(E), dated 17.5.2002 (w.e.f. 17.5.2002). Earlier it was inserted by G.S.R. 7, dated 22.12.1998 (w.e.f. 2.1.1999).]