TCVN 6772:2000

1

VIETNAM STANDARDS TCVN 6772:2000

Water quality – Domestic wastewater standards

Allowed pollution limitation

1 Scope of application

This Standard shall be applied for the wastewater of types of service organizations, public

buildings and apartment buildings as specified in Table 2 hereinafter called as domestic

wastewater) when discharging into the statutory disposal areas.

This Standard is only applied for the domestic wastewater in the areas where the

wastewater collection, treatment systems are not available.

This Standard is not applied for industrial wastewater as stipulated in TCVN 5945-1996.

2 Allowed pollution limitation

2.1 The parameters and concentration of polluting components in the domestic

wastewater when discharging into specified water disposal areas shall not exceed the

limitations stated in Table 1.

Table 1 – Pollution parameters and allowed limits

Pollution parameters Unit Allowed limits Level 1 Level II Level III Level IV Level V

1 pH 5-9 5-9 5-9 5-9 5-9

2 BOD mg/l 30 30 40 50 200

3 Suspended solids mg/l 50 50 60 100 100

4 Solids which can deposit mg/l 0.5 0.5 0.5 0.5 NS

5 Total dissolved solids mg/l 500 500 500 500 NS

6 Sulfur (based on H2S) mg/l 1.0 1.0 3.0 4.0 NS

7 Nitrate (NO3) mg/l 30 30 40 50 NS

8 Oil & fat (foodstuff) mg/l 20 20 20 20 100

9 Phosphate (PO43-

) mg/l 6 6 10 10 NS

10 Total coliforms MPN/

100ml 1000 1000 5000 5000 10000

NS : not stipulated

2.2 The limitations stated in Table 1 are defined according to the analysis methods

stipulated in the corresponding current standards.

2.3 Subject to the types, sizes and using area of the service organizations, public works

and tenement buildings, the limitations of pollution components in domestic

wastewater shall be specifically applied according to Table 2.

TCVN 6772:2000

2

Table 2

Types of service

organizations, public

works, tenement

buildings

Size and using area of

service organizations,

public works, tenement

buildings

Allowed

limits

based on

Table 1

Remarks

1 Hotel under 60 rooms

from 60 to 200 rooms

over 200 rooms

Level III

Level II

Level I

2 Guest house, inn from 10 to 50 rooms

from 50 to 250 rooms

over 250 rooms

Level IV

Level III

Level II

3 Small hospital, aid station

from 10 to 30 beds

over 30 beds

Level II

Level I

Wastewater shall be disinfected

prior to discharging to the

environment

4 General hospital Level I Wastewater shall be disinfected.

If there are polluting

components out of the

parameters stated in Table 1 of

this Standard, then the

corresponding limits for such

parameters in TCVN 5945-

1995 shall be applied

5 State-owned office,

enterprise, foreign-

owned organization,

bank, office.

from 5,000m2 to 10,000m

2

over 1o,000om2 to 50,000m

2

more than 50,000m2

Level III

Level II

Level I

The calculated area is working

area

6 School, institute and

similar establishment

from 5,000m2 to 25,000m

2

over 25,000m2

Level II

Level I

Specialized institutes

concerning chemicals and

biology, where wastewater

comprises polluting

components out of the

parameters stated in Table 1 of

this Standard, then the

corresponding limits for such

parameters in TCVN 5945-

1995 shall be applied.

7 Department store, super

market

from 5,000m2 to 25,000m

2

over 25,000m2

Level II

Level I

8 Fresh food market from 500m2 to 1,000m

2

above 1,000m2 to 1,500m

above 1,500m2 to 2,500m

above 2,500m2

Level IV

Level III

Level II

Level I

9 Restaurant, public

canteen, foodstuff stores

under 100m2

from 100m2 to 250m

2

above 250m2 to 500m

above 500m2 to 2,500m

above 2,500m2

Level V

Level IV

Level III

Level II

Level I

The area calculated is that of

dining room.

10 Tenement building area under 100 apartments

from 100 to 500 apartments

over 500 apartments

Level III

Level II

Level I