Sewage discharge standards
(According to Article 5 of the Water Pollution Prevention Regulation)
Introduction and Definitions
This standard has been compiled and prepared by the Environmental Protection Organization, in accordance with Article 5 of the Water Pollution Prevention Regulation and with regard to Article (3) of the same regulation, and in cooperation with the Ministries of Health, Medical Treatment and Education, Power, Industry and Mines and Metals, and Agriculture.
The definitions and amendments used in this standard are explained below.
– Surface water: It consists of seasonal or permanent waters, natural or artificial lakes and ponds.
– Suction well: It is a hole or pit that has suction capability and its bottom is the highest point. The stationary surface should be at least 3 meters away.
– ﺗﺮاﻧﺸﻪ ﺟﺬﺑﯽ : ﻋﺒﺎرت اﺳﺖ از ﻣﺠﻤﻮﻋﻪ ای از ﮐﺎﻧﺎﻟﻬﺎی اﻓﻘﯽ ﮐﻪ ﻓﺎﺿﻼب ﺑـﻪ ﻣﻨﻈﻮرﺟـﺬب They are drained to the ground and the distance between their bottom and the highest static surface is at least 3 meters.
– Bypass: A channel that carries wastewater without passing through part or all of the treatment plant. Direct the other section or output channel.
– Composite sample: This involves preparing a 24-hour sample from samples taken at intervals. A maximum of 4 hours have been provided.
General remarks:
1- Wastewater discharge must be based on standards expressed in terms of maximum pollutant concentrations, and compliance with these standards is essential under the supervision of the Environmental Protection Agency.
2- Those responsible for polluting sources must treat production wastewater to meet standards through engineering studies and the use of appropriate and economical technology.
3- Measurement of the concentration of pollutants and the flow rate in wastewater must be carried out immediately after the last treatment unit of the wastewater treatment plant and before entering the environment.
4- Measurements to comply with declared standards before wastewater treatment facilities It should be based on a composite sample. In systems with discontinuous discharge, the size The arrest will be mandatory during the evacuation period.
5- Sludge and other solid materials produced in sewage treatment facilities must be properly treated before disposal, and the final discharge of these materials must not cause environmental pollution.
6- Treated wastewater must be discharged into receiving waters under uniform conditions and in a manner that ensures maximum mixing.
7- The effluent should not have an unusual odor and should not contain foam and floating objects.
8- The color and turbidity of the effluent should not significantly change the natural appearance of the receiving waters and the discharge site.
9- Methods for measuring polluting parameters based on the methods mentioned in the book:
Standard Methods for the Examination of Water and Waste Water
It will be.
10- The use of septic tank and imhof tank systems using wells or absorption trenches is prohibited in areas where the distance between the bottom of the well or trench and the groundwater level is less than 3 meters.
11- While complying with the relevant standards, wastewater discharge should not alter the quality of water for its intended use.
12- Diluting treated or raw wastewater to bring the concentration of pollutants to the declared standards is not acceptable.
13- The use of wastewater evaporation methods is permitted with the approval of the Environmental Protection Agency.
14- The use of culverts is prohibited. Culverts used solely to remove debris from treatment units or during the combined collection of municipal sewage and rainwater are permitted.
15- Sewage treatment facilities should be designed, constructed, and operated in a manner that provides the necessary provisions to minimize pollution in emergency situations such as adverse weather conditions, power outages, mechanical equipment failures, etc.
Note 1 – Discharge with a concentration greater than that specified in the table will be permitted provided that the effluent does not increase the concentration of chlorides, sulfates, and dissolved substances in the receiving source by more than ten percent within a radius of 200 meters.
Note 2 – Discharge with a concentration higher than that specified in the table will be permitted provided that the increase in chloride, sulfate, and dissolved substances in the effluent does not exceed ten percent compared to the water used.
Comment 3 – Existing industries will be allowed to reduce BOD5 and COD by at least 90 percent.
Comment 4- The temperature should be such that it does not increase or decrease the temperature of the receiving source by more than 3 degrees Celsius within a radius of 200 meters from its entry point.
Comment 5 – The number of parasite eggs (nematodes) in treated municipal sewage, when used for irrigation of products that are consumed raw, should not exceed one per liter.
Sewage discharge standard table
|
the number |
Pollutants |
Surface water discharge mg/1 |
Drainage into the well Absorbent mg/1 |
Agricultural expenses and Irrigation mg/1 |
|
|
1 |
silver |
Ag |
1 |
0/1 |
0/1 |
|
2 |
Aluminum |
Al |
5 |
5 |
5 |
|
3 |
آرﺳﻨﯿﮏ |
As |
0/1 |
0/1 |
0/1 |
|
4 |
bor |
B |
2 |
1 |
1 |
|
5 |
bạry̰m |
Ba |
5 |
1 |
1 |
|
6 |
Beryllium |
Be |
0/1 |
1 |
0/5 |
|
7 |
Calcium |
Ca |
75 |
– |
– |
|
8 |
Cadmium |
Cd |
0/1 |
0/1 |
0 /05 |
|
9 |
free chlorine |
Cl |
1 |
1 |
0/2 |
|
10 |
Chloride |
Cl- |
600 ( ﺗﺒﺼﺮه 1) |
600 ( ﺗﺒﺼﺮه 2) |
600 |
|
11 |
Formaldehyde |
CH2O |
1 |
1 |
1 |
|
12 |
Phenol |
C6H5O H |
1 |
insignificant |
1 |
|
13 |
Cyanide |
CN |
0/5 |
0/1 |
0/1 |
|
14 |
Cabal |
Co |
1 |
1 |
0 /05 |
|
15 |
krem |
Cr +6 |
0/5 |
|
1 |
|
16 |
krem |
Cr +3 |
2 |
2 |
2 |
|
17 |
copper |
Cu |
1 |
1 |
0/2 |
|
18 |
Fluoride |
F |
2/5 |
2 |
2 |
|
19 |
iron |
Fe |
3 |
3 |
3 |
|
20 |
mercury |
Hg |
insignificant |
insignificant |
insignificant |
|
21 |
Lithium |
Li |
2/5 |
2/5 |
2/5 |
|
22 |
Magnesium |
Mg |
100 |
100 |
1001 |
|
23 |
Manganese |
Mn |
1 |
1 |
1 |
|
24 |
Molybdenum |
Mo |
0 /01 |
0 /01 |
2 |
|
25 |
nickel |
Ni |
2 |
2 |
2 |
|
26 |
Ammonim according to |
NH4 |
2/5 |
1 |
– |
|
27 |
Nitrite according to |
NO2 |
10 |
10 |
– |
|
28 |
Nitrate according to |
NO3 |
50 |
10 |
– |
|
29 |
Phosphates by phosphorus |
|
6 |
6 |
– |
Sewage discharge standard table
|
the number |
Pollutants |
Drainage of water Surface mg/1 |
Drainage into the well Absorbent mg/1 |
Agricultural expenses and Irrigation mg/1 |
|
|
30 |
lead |
Pb |
1 |
1 |
1 |
|
31 |
Selenium |
Se |
1 |
0/1 |
0/1 |
|
32 |
Sulfide |
SH2 |
3 |
3 |
3 |
|
|
|
|
|
|
|
|
33 |
Sulfite SO3 |
1 |
1 |
1 |
|
|
34 |
Sulfate SO4 |
400 (Explanation 1) |
400 (Explanation 1) |
500 |
|
|
35 |
Vanadium V |
0/1 |
0/1 |
0/1 |
|
|
36 |
Roy Zn |
2 |
2 |
2 |
|
|
37 |
Fat, oil |
10 |
10 |
10 |
|
|
38 |
Detergent ABS |
1 /5 |
0 /5 |
0 /5 |
|
|
39 |
ﺑـــــــــــــــــــــــــــﯽ او دی BOD 5 (Interpretation 3) |
30 (50 at the moment) |
30 (50 at the moment) |
100 |
|
|
40 |
CO (Explanation 3) COD |
60 (100 at the moment) |
60 (100 at the moment) |
200 |
|
|
41 |
اﮐﺴﯿﮋن ﻣﺤﻠﻮل ( ﺣﺪاﻗﻞ ) Do |
2 |
– |
2 |
|
|
42 |
Total dissolved solids TDS |
Commentary 1 |
Commentary 2 |
– |
|
|
.43 |
Total suspended solids TSS |
40 (60 for a moment) |
– |
100 |
|
|
44 |
Seated materials SS |
0 |
|
|
|
|
45 |
P Hash (limit) PH |
6/5-8/5 |
5-9 |
6-8/5 |
|
|
46 |
Radioactive materials |
0 |
0 |
0 |
|
|
47 |
Turbidity (turbidity unit) |
50 |
– |
50 |
|
|
48 |
Color (color unit) |
75 |
75 |
75 |
|
|
49 |
Temperature T |
Commentary 4 |
– |
– |
|
|
50 |
Milliliter) Gastrointestinal coliforms (count per 100) |
400 |
400 |
400 |
|
|
51 |
Coliform bacteria (number per 100 ml) MPN |
1000 |
1000 |
1000 |
|
|
52 |
Parasite eggs |
– |
– |
(Interpretation 5) |
|
