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Generic Standard
Part I
Tolerance Limits for Industrial Effluents to be Discharged into Inland Surface Waters
| Characteristics |
Tolerance Limit |
| Total Suspended solids, mg/L, Max |
30-200 |
| Particle size of total suspended particles |
Shall pass 850-micron Sieve. |
| pH |
5.5 to 9.0 |
| Temperature |
Shall not exceed 40 degree C in any section of the stream within 15 meters
down-stream from the effluent outlet. |
| Biochemical oxygen demand (BOD) for 5 days at 20 degree C, mg/L, Max |
30-100 |
| Oils and grease, mg/L, Max |
10 |
| Phenolic compounds, mg/L, Max |
1 |
| Cynides (as CN), mg/L, Max |
0.2 |
| Sulphides (as S), mg/L, Max |
2 |
| Radioactive materials: |
|
| a. Alpha emitters, c/ml, Max |
10 -7 |
| b. Beta emitters, c/ml, Max |
10 -8 |
| Insecticides |
Absent |
| Total residual chlorine, mg/L |
1 |
| Fluorides (as F), mg/L, Max |
2 |
| Arsenic (as As), mg/L, Max |
0.2 |
| Cadmium (as, Cd), mg/L, Max |
2 |
| Hexavalent chromium (as Cr), mg/L, Max |
0.1 |
| Copper (as Cu), mg/L, Max |
3 |
| Lead (as Pb), mg/L, Max |
0.1 |
| Mercury (as Hg), mg/L, Max |
0.01 |
| Nickel (as Ni), mg/L, Max |
3 |
| Selenium (as Se), mg/L, Max |
0.05 |
| Zinc (as Zn), mg/L, Max |
5 |
| Ammonical nitrogen, mg/L, Max |
50 |
| Chemical Oxygen Demand, mg/L, Max |
250 |
| Silver, mg/L, Max |
0.1 |
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Generic Standard
Part II
Tolerance Limits for Industrial Effluents to be Discharged into Public Sewers
| Characteristics |
Tolerance Limit |
| Total Suspended solids, mg/L, Max |
600 |
| pH |
5.5 to 9.0 |
| Temperature, 0C, Max |
45 |
| Biochemical oxygen demand (BOD) for 5 days at 20 degree C, mg/L, Max |
400 |
| Oils and grease, mg/L, Max |
50 |
| Phenolic compounds, mg/L, Max |
10 |
| Cynides (as CN), mg/L, Max |
2 |
| Sulphides (as S), mg/L, Max |
2 |
| Chloride (Cl), mg/L, Max |
1000 |
| Insecticides |
Absent |
| Sulphates (SO4), mg/L, Max |
500 |
| Fluorides (as F), mg/L, Max |
10 |
| Arsenic (as As), mg/L, Max |
1 |
| Cadmium (as, Cd), mg/L, Max |
2 |
| Total Chromium, mg/L, Max |
2 |
| Copper (as Cu), mg/L, Max |
3 |
| Lead (as Pb), mg/L, Max |
0.1 |
| Mercury (as Hg), mg/L, Max |
0.01 |
| Nickel (as Ni), mg/L, Max |
3 |
| Selenium (as Se), mg/L, Max |
0.05 |
| Zinc (as Zn), mg/L, Max |
5 |
| Ammonical nitrogen, mg/L, Max |
50 |
| Chemical Oxygen Demand, mg/L, Max |
1000 |
| Silver, mg/L, Max |
0.1 |
| Total Dissolved Solids, mg/l, Max |
2100 |
| Mineral Oils, mg/L, Max |
10 |
| Inhibition of nitrification test at 200ml/l |
< 50% |
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Generic Standard
Part III
Tolerance Limits for Wastewater to be Discharged into Inland Surface Waters from Combined Wastewater Treatment Plant
| Characteristics |
Tolerance Limit |
| Total Suspended solids, mg/L, Max |
50 |
| Particle size of total suspended particles |
Shall pass 850-micron Sieve. |
| pH |
5.5 to 9.0 |
| Temperature |
Shall not exceed 40 degree C in any section of the stream within 15 meters
down-stream from the effluent outlet. |
| Biochemical oxygen demand (BOD) for 5 days at 20 degree C, mg/L, Max |
50 |
| Oils and grease, mg/L, Max |
10 |
| Phenolic compounds, mg/L, Max |
1 |
| Cynides (as CN), mg/L, Max |
0.2 |
| Sulphides (as S), mg/L, Max |
2 |
| Radioactive materials: |
|
| a. Alpha emitters, c/ml, Max |
10 -7 |
| b. Beta emitters, c/ml, Max |
10 -8 |
| Insecticides |
Absent |
| Total residual chlorine, mg/L |
1 |
| Fluorides (as F), mg/L, Max |
2 |
| Arsenic (as As), mg/L, Max |
0.2 |
| Cadmium (as, Cd), mg/L, Max |
2 |
| Hexavalent chromium (as Cr), mg/L, Max |
0.1 |
| Copper (as Cu), mg/L, Max |
3 |
| Lead (as Pb), mg/L, Max |
0.1 |
| Mercury (as Hg), mg/L, Max |
0.01 |
| Nickel (as Ni), mg/L, Max |
3 |
| Selenium (as Se), mg/L, Max |
0.05 |
| Zinc (as Zn), mg/L, Max |
5 |
| Ammonical nitrogen, mg/L, Max |
50 |
| Chemical Oxygen Demand, mg/L, Max |
250 |
| Silver, mg/L, Max |
0.1 |
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Sampling and Analysing Methods
Part I
Sampling
| |
Prescribed ISO Standard Numbers |
| Guidance on the design of sampling programs |
5667 (1) |
| Guidance on sampling techniques |
5667 (2) |
| Guidance on the preservation and handling of samples |
5667 (3) |
| Guidance on sampling of wastewaters |
5667 (10) |
Part II
Analyzing
| Parameters |
Prescribed ISO Standard Numbers |
| Total Suspended solids, mg/L, Max |
11923 |
| pH |
10523 |
| Biochemical oxygen demand (BOD) for 5 days at 20 degree C, mg/L, Max |
5815 |
| Oils and grease, mg/L, Max |
9377 (1,2,4) |
| Phenolic compounds, mg/L, Max |
14402 / 6439 |
| Cyanides (as CN), mg/L, Max |
6703 (1) |
| Sulphides (as S), mg/L, Max |
10530 |
| Chloride (Cl), mg/L, Max |
10304 (2) / 9297 |
| Insecticides |
6468 |
| Sulphates (SO4), mg/L, Max |
10304 (2) |
| Fluorides (as F), mg/L, Max |
10304 (1) |
| Arsenic (as As), mg/L, Max |
11885/11969/6595 |
| Cadmium (as, Cd), mg/L, Max |
5961/8288 |
| Total Chromium, mg/L, Max |
9174/11083 |
| Copper (as Cu), mg/L, Max |
8288/11885 |
| Lead (as Pb), mg/L, Max |
8288/11885 |
| Mercury (as Hg), mg/L, Max |
5666 |
| Nickel (as Ni), mg/L, Max |
8288 /11885 |
| Selenium (as Se), mg/L, Max |
9965/11885 |
| Zinc (as Zn), mg/L, Max |
8288/11885 |
| Ammonical nitrogen, mg/L, Max |
11905 (1)/5664 |
| Chemical Oxygen Demand, mg/L, Max |
ISO/DIS 15705 / 6060 |
| Silver, mg/L, Max |
11885 |
| Mineral Oils, mg/L, Max |
9377 (1,2,4) |
| Inhibition of nitrification test* |
9509 |
* Note on nitrification test
To supplement the analyzing of the wastewater for various parameters, a Nitrification test can be conducted. The test gives information on the general characteristics of the wastewater in relation to the possible effects of the wastewater on the biological processes that takes place in the wastewater treatment plant.
The Nitrification test provides data on the inhibitory effect of a sample of the wastewater on a specified population of nitrification bacteria. The inhibitory effect of the wastewater on the nitrification processes should be less than 50% in 200 ml/l solution of the wastewater.
The test is described in the ISO 9509:1989 standard. However this standard do not take a possible loss of Nitrate during the test into account. In addition the specified minimum oxygen concentration of 2 mg/l is similarly too low, as the nitrification process will be substantially inhibited at such a concentration of oxygen.
It is therefore recommended to use an oxygen concentration of at least 6 mg/l during the test and to analyze for ammonium-N as well as for nitrate and nitrite-N when industrial wastewater is tested.
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