National Technical Regulation on domestic wastewater, QCVN 14:2008/BTNMT

NATIONAL TECHNICAL REGULATION

QCVN 14:2008/BTNMT

ON DOMESTIC WASTEWATER

Introduction

QCVN 14:2008/BTNMT was compiled by the Editorial Board for national technical regulation on water quality, submitted for approval by the Vietnam Environment Administration and Department of Legal Affairs, and issued together with Decision No. 16/2008/QD-BTNMT dated December 31, 2008, of the Minister of Natural Resources and Environment.

NATIONAL TECHNICAL REGULATION

ON DOMESTIC WASTEWATER

1. GENERAL PROVISIONS

1.1. Scope of regulation

This Regulation specifies the permissible maximum value of the pollution parameters in domestic wastewater discharged into the environment.

This Regulation does not apply to domestic wastewater discharged into the concentrated wastewater treatment system.

1.2. Subjects of application

This Regulation applies to public establishments, armed forces barracks, service establishments, apartment complexes and residential areas and enterprises discharging domestic wastewater into the environment.

1.3. Interpretation of terms

In this Regulation, the terms below are construed as follows:

1.3.1. Domestic wastewater means the wastewater discharged from human activities such as eating, drinking, bathing, personal hygiene.

1.3.2. The water resource receiving wastewater means the surface water resource or coastal waters with a prescribed purpose of use, where the wastewater is discharged into.

2. TECHNICAL REGULATIONS

2.1. Permissible maximum value of pollution parameters in domestic wastewater

Permissible maximum value of pollution parameters in domestic wastewater when being discharged into the water resource receiving wastewater must not exceed C_max value, which is calculated as follows:

C_max = C x K

Of which:

C_max is the permissible maximum concentration of pollution parameters in domestic wastewater when being discharged into the receiving water resource. C_max is calculated by milligram per liter of wastewater (mg/l);

C is the concentration values ​​of pollution parameters prescribed in Table 1 of Section 2.2.

K is a coefficient taking into account the size and type of services establishments, public establishments and apartments prescribed in Section 2.3.

This formula shall not be used for calculating the permissible maximum concentration in effluent for parameter pH and total coliforms.

2.2. C value of pollution parameters used as a basis for calculating the permissible maximum value

C value of pollution parameters used as a basis for calculating the permissible maximum value C_max in domestic wastewater when being discharged into water resources receiving wastewater is prescribed in Table 1.

Table 1: Value of pollution parameters used as a basis for calculating the permissible maximum value in domestic wastewater

Of which:

- Column A specifies C value of pollution parameters used as a basis for calculating the permissible maximum value in domestic wastewater when being discharged into water resources that are used for the purpose of domestic water supply (with water quality equivalent to that in column A1 and A2 of the national technical regulation on surface water quality).

- Column B specifies C value of pollution parameters used as a basis for calculating the permissible maximum value in domestic wastewater when being discharged into water resources that are not used for the purpose of domestic water supply (with water quality equivalent to that in column B1 and B2 of the national technical regulation on surface water or coastal water quality).

2.3. K coefficient value

Depending on the type, size and area of use of service establishments, public establishments, apartment complexes and residential areas, and enterprises, the K coefficient value is applied according to Table 2

Table 2. K coefficient value corresponding to types of service establishments, public establishments, and apartment complexes

3. DETERMINATION METHOD

The method for determination of the value of pollution parameters in domestic wastewater shall comply with guidance of national standards or corresponding analytical standards of international organizations:

- TCVN 6492-1999 (ISO 10523-1994) – Water quality - Determination of pH.

- TCVN 6001-1995 (ISO 5815-1989) - Water quality - Determination of biochemical oxygen demand after 5 days (BOD5) - Dilution and seeding method.

- TCVN 6625-2000 (ISO 11923-1997) - Water quality - Determination of suspended solid by filtration through glass fiber filter.

- TCVN 6053-1995 (ISO 9696-1992) - Water quality - Determination of total dissolved solids.

- TCVN 4567-1988 - Water quality - Determination of the original sulfide and sulfate

- TCVN 5988-1995 (ISO 5664-1984) - Water quality - Determination of ammonium - Distillation and titration method

- TCVN 6180-1996 (ISO 7890-3-1988) - Water quality - Determination of nitrate - Spectrometric method using sulfosalicylic acid

- TCVN 6336-1998 (ASTM D 2330-1988) - Test method for Methylene Blue Active Substances

- TCVN 6622-2000 - Water quality - Determination of surfactants. Part 1: Determination of anionic surfactants by measurement of the methylene blue spectrum

- TCVN 6494-1999 - Water quality - Determination of ion of fluoride, chloride, nitrite, Orthophotphat, bromide, nitrate and soluble sulphate in liquid ion chromatography.

- TCVN 6187-1-1996 (ISO 9308-1-1990) - Water quality - Detection and enumeration of coliform organisms, thermotolerant coliform organisms and presumptive Escherichia coli - Part 1: Membrane filtration method

- TCVN 6187-2:1996 (ISO 9308-2:1990) Water quality - Detection and enumeration of coliform organisms, thermotolerant coliform organisms and presumptive Escherichia coli - Part 2: Multiple tube (most probable number) method

Method for determination of total oil and grease according to U.S. EPA Method 1664 Extraction and gravimetry (Oil and grease and total petroleum hydrocarbons).

4. IMPLEMENTATION ORGANIZATION

This Regulation replaces TCVN 6772:2000 - Water quality - domestic wastewater quality standards in the List of Vietnamese standards on environment which is mandatorily applied and issued together with Decision No. 35/2002/QD-BKHCNMT dated June 25, 2002, of the Minister of Science, Technology and Environment.

Organizations and individuals concerned to the discharge of domestic wastewater to the environment shall comply with this Regulation.

State management agencies in charge of environment shall be responsible for guiding, inspecting and monitoring the implementation of this Regulation.

In case any national standard referred to in this Regulation is amended and supplemented or replaced, the new ones shall prevail.