TABLE 1 : TOLERANCE LIMITS FOR INDUSTRIAL EFFLUENTS

(As per IS:2490(Part I) - 1981)

Sr.No. Characteristic

 Discharge into
Inland Surface Waters Public Sewer On Land for Irrigitation Marine Costal Areas
1 Suspended Solids, mg/l 100 600 200 100
2 Dissolved Solids (inorganic), mg/l 2100 2100 2100 -
3 pH value 5.5 to 9 5.5 to 9 5.5 to 9 5.5 to 9
4  Temperature, 0C Shall not exceed 40 within 15m d/s from effluent outlet 45 at the point of discharge - 45 at the point of discharge
5 Oil and grease, mg/l 10 20 10 20
6 Biochemical Oxygen Demand(5d, 20 0 C) 30 350* 100* 100*
7 Chemical Oxygen Demand, **  mg/l 250 - - 250
8 Total Residual Chlorine, mg/l 1 - - 1
9 Ammonical nitrogen (as N),mg/l 50 50 - 50
10 Total kjeldal nitrogen (as N), mg/l 100 - - 100
11 Free Ammonia (as NH3), mg/l 5 - - 5
12 Arsenic (as As), mg/l 0.2 0.2 0.2 0.2
13 Mercury (as Hg), mg/l 0.01 0.01 - 0.01
14 Lead (as Pb), mg/l 0.1 1 - 1
15 Cadmium (as Cd), mg/l 2 1 - 2
16 Hexavalent Chromium (as Cr+6), mg/l 0.1 2 - 1
17 Total Chromium (as Cr), mg/l 2 2 - 2
18 Copper (as Cu), mg/l 3 3 - 3
19 Zinc (as Zn), mg/l 5 15 - 15
20 Selenium (as Se), mg/l 0.05 0.05 - 0.05
21 Nickel (as Ni), mg/l 3 3 - 5
22 Boron (as B), mg/l 2 2 2 -
23 Percent Sodium, - 60 60 -
24 Residual Sodium Carbonate, meq/l, - - 5 -
25 Cyanide (as CN), mg/l 0.2 2.0 0.2 0.2
26 Chloride (as Cl), mg/l 1000 1000 600 -
27 Fluoride (as F), mg/l 2 15 - 15
28 Dissolved Phosphates (as P), mg/l 5 - - -
29 Sulphate (SO4), mg/l 1000 1000 1000 -
30 Pesticides Absent Absent Absent Absent
31 Radioactive materials        
  a)Alpha emitters, ?c/ml 10-7 10-7 10-8 10-7
  b)Beta emitters, ?c/ml 10-6 10-6 10-7 10-6

Note 1: *  Further relaxation may be decided by the concerned agencies.

Note 2: ** For paper, dyestuff, pesticide and certain chemical and petrochemical industries, these values may be relaxed. Whenever these values are relaxed, it shall be ensured that the effluent passes the test for acute lethal toxicity as given in IS:6582.

Note 3: All efforts should be made to remove colour

TABLE 2 : HYDRAULIC LOADING FOR DIFFERENT SOILS

(As per IS:2490(Part I) - 1981)

Sl. No. Soil Texture Class Recommended Dosage of Settled Industrial Effluents, m3/hectare/day
1 Sandy 225 to 280
2 Sandy loam 170 to 225
3 Loam 110 to 170
4 Clay loam 55 to 110
5 Clayey 35 to 55

Note: This Table is a guideline only, as these values may vary depending on factors such as characteristics of waste water, infiltration panerai replica watches capacity, permeability of soil, cropping pattern and passage of time.