Thailand Thailand announces the effluent standard for housing estates

Ministry of Natural Resources and Environment announced two notifications regarding the effluent standard for housing estates in the Royal Gazette on 19 July 2021 by virtue of the Enhancement and Conservation of National Environmental Quality Act, B.E. 2535 (1992). The notifications are;

 

Effluent standard

The developed land is classified into three types as follows;

  1. Type A is a land with more than 500 sections/units or an area of more than 100 Rai.
  2. Type B is a land with 100 to 499 sections/units or an area of 19 to 100 Rai.
  3. Type C is a land with 10 to 99 sections/units or an area of less than19 Rai.

* A rai is a unit of area equal to 1,600 square meters

 

The effluent standard for each type of housing estate is set as shown in the following table.

Parameter

Unit Standard
Type A Type B

Type C

1. pH

5.5-9.0

5.5-9.0

5.5-9.0

2. BOD (Biochemical Oxygen Demand)

mg/l

20

30

40

3. TSS (Total Suspended Solids)

mg/l

30

40

50

4. TDS (Total Dissolved Solids)

mg/l

1000

1000

1300

5. Sulfide

mg/l

1.0

1.0

1.0

6. TKN (Total Kjeldahl Nitrogen)

mg/l

35

35

35

7. Oil and Grease

mg/l

20

20 20

Each type of developed land shall provide a necessary wastewater treatment system to meet the standard before discharging to the environment. Dilution is not permitted. The new standard has been effective since the next day of publication, namely 20 July 2021, for Type A and Type B lands while one year of grace period has been given to Type C lands.