| Parameter |
Unit |
Standard values |
| 1. |
pH |
- |
5.5 - 9.0 |
| 2. |
Total Dissolved Solids (TDS) |
mg/L |
- not more than 3,000 mg/l depending on receiving water or type of industry under consideration of PCC but not exceed 5,000 mg/l
- not more than 5,000 mg/l exceed TDS of receiving water having salinity of more than 2,000 mg/l or TDS of sea if discharge to sea |
| 3. |
Suspended Solids (SS) |
mg/L |
not more than 50 mg/l depending on receiving water or type of industry or type of wastewater treatment system under consideration of PCC but not exceed 150 mg/l |
| 4. |
Temperature |
°C |
not more than 40 |
| 5. |
Colour and Odour |
- |
not objectionable |
| 6. |
Sulfide (as H2S) |
mg/L |
not more than 1.0 |
| 7. |
Cyanide (as HCN) |
mg/L |
not more than 0.2 |
| 8. |
Heavy Metals |
|
|
| - Zinc |
mg/L |
not more than 5.0 |
| - Chromium (Hexavalent) |
mg/L |
not more than 0.25 |
| - Chromium (Trivalent) |
mg/L |
not more than 0.75 |
| - Arsenic |
mg/L |
not more than 0.25 |
| - Copper |
mg/L |
not more than 2.0 |
| - Mercury |
mg/L |
not more than 0.005 |
| - Cadmium |
mg/L |
not more than 0.03 |
| - Barium |
mg/L |
not more than 1.0 |
| - Selenium |
mg/L |
not more than 0.02 |
| - Lead |
mg/L |
not more than 0.2 |
| - Nickel |
mg/L |
not more than 1.0 |
| - Manganese |
mg/L |
not more than 5.0 |
| 9. |
Fats Oil and Grease (FOG) |
mg/L |
not more than 5 mg/l depending on receiving water or type of industry under consideration of PCC but not exceed 15 mg/l |
| 10. |
Formaldehyde |
mg/L |
not more than 1.0 |
| 11. |
Phenols |
mg/L |
not more than 1.0 |
| 12. |
Free Chlorine |
mg/L |
not more than 1.0 |
| 13. |
Pesticides |
mg/L |
not detectable |
| 14. |
Biochemical Oxygen Demand (BOD) |
mg/L |
not more than 20 mg/l depending on receiving water or type of industry under consideration of PCC but not exceed 60 mg/l |
| 15. |
Total Kjeldahl Nitrogen (TKN) |
mg/L |
not more than 100 mg/l depending on receiving water or type of industry under consideration of PCC but not exceed 200 mg/l |
| 16. |
Chemical Oxygen Demand (COD) |
mg/L |
not more than 120 mg/l depending on receiving water or type of industry under consideration of PCC but not exceed 400 mg/l |
| Remarks |
: |
1. |
PCC = Pollution Control Committee |
| |
|
2. |
The standards were summarized from the Notification of the Ministry of Science Technology and Environment No.3 B.E. 2539 (1996) issued under the Enhancement and Conservation of the National Environmental Quality Act B.E. 2535 (1992). The Notification was published in the Royal Government Gazette, Vol.113, Part 13 D, dated 13 February B.E. 2539 (1996). |
| |
|
3. |
Notification of the Ministry of Science Technology and Environment No.4 B.E. 2539 (1996) issued under the Enhancement and Conservation of the National Environmental Quality Act B.E. 2535 (1992) and published in the Royal Government Gazette, Vol. 113, Part 13 D, dated 13 February B.E. 2539 (1996) specifies that pollution sources that the above standards are to be applied are factories group II and III issued under the Factory Act B.E. 2535 (1992) and every kind of industrial estates. |
| |
|
4. |
Notification of the Pollution Control Committee No.3 B.E. 2539 (1996) dated 20 August B.E. 2539 (1996) has issued types of factories (category of factories issued under the Factory Act B.E. 2535 (1992) ) that are allowed to discharge effluent having different standards from the Ministerial Notification No.3 above as follows :
4.1 BOD up to 60 mg/l
1) animal finishing factories (category 4 (1) )
2) starch factories (category 9 (2) )
3) food from starch factories (category 10)
4) animal food factories (category 15)
5) textile factpries (category 22)
6) tanning factories (category 29)
7) pulp and paper factories (category 38)
8) chemical factories (category 42)
9) pharmaceutical factories (category 46)
10) frozen food factories (category 92)
4.2 COD up to 400 mg/l
1) food furnishing factories (category 13 (2))
2) animal food factories (category 15(1))
3) textile factories (category 22)
4) tanning factories (category 29)
5) pulp and paper factories (category 38)
4.3 TKN
1) 100 mg/l - effective after 1 year from the date published in the Royal Government Gazette of the Ministerial Notificaiton No. 4
2) 200 mg/l - effective after 2 year from the date published in the Royal Government Gazette of the Ministerial Notification No. 4 for the following factories :- food furnishing factories (category 13 (2))- animal food factories (category 15(1)) |
