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.