TCVN 6772:2000

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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 9hereinafter 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

Allowed limits Pollution parameters Unit

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 (PO4

3-) 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

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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 10,000m2 over 1o,000om2 to 50,000m2

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 25,000m2 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 25,000m2 over 25,000m2

Level II Level I

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

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 250m2

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