Determining water quality: (National Technical Regulation on Industrial Wastewater)
Industrial wastewater is wastewater generated from the technological process of industrial facilities, from centralized wastewater treatment plants with connection to industrial facilities.
The water-receiving sources are: residential drainage systems; rivers, streams, canals and ditches; canals, ditches; lakes, ponds, lagoons; coastal waters.
Allowed maximum value of pollution parameters in industrial wastewater when discharged into wastewater-receiving sources
The maximum allowed value of pollution parameters in the industrial wastewater when discharged into the water-receiving sources is calculated:
Cmax = C x Kq x Kf
- Cmax is the maximum allowed value of pollutant parameter in industrial wastewater when discharged into water-receiving sources;
- C is the value of the pollution parameter in industrial wastewater specified in Table 1;
- Kq is the coefficient of the wastewater-receiving source corresponding to the flow rate of a river, stream, slot; canals, ditches; capacity of lakes, ponds, lagoons; the propose of the coastal waters;
- Kf is the flow rate coefficient corresponding to the total flow rate of industrial wastewater when discharged into wastewater-receiving sources;
Apply the maximum allowed value Cmax = C (Kq and Kf coefficients are not applied) to the following parameters: temperature, color, pH, coliform, total α radioactivity, total β radioactivity.
Industrial wastewater discharged residential drainage systems without wastewater treatment plants then apply the value Cmax = C specified in column B table 1.
The C value of the pollution parameters in industrial wastewater is specified in Table 1
Table 1: C value of the pollution parameters in industrial wastewater
TCVN 6626: 2000 - Water quality - Determination of arsenic - Atomic absorption spectrometric method (hydrogen technique);
TCVN 7877: 2008 (ISO 5666: 1999) - Water quality - Determination of mercury;
TCVN 6193: 1996 - Water quality - Determination of cobalt, nickel, copper, zinc, cadmium and lead. Flame atomic absorption spectrometric method;
TCVN 6222: 2008 - Water quality - Determination of chromium - Atomic absorption spectrometric method;
TCVN 6658: 2000 - Water quality - Determination of hexavalent chromium - Photometric method using 1,5 - diphenylcacbazid;
TCVN 6002: 1995 - Water quality - Determination of manganese - Photometric method using formaldoxime;
TCVN 6177: 1996 - Water quality - Determination of iron by spectroscopic method using the 1,10-phenantrolin reagent;
TCVN 6665: 2011 (ISO 11885: 2007) - Water quality - Determination of selected elements by inductively coupled plasma optical emission spectroscopy (ICP-OES);
TCVN 6181: 1996 (ISO 6703 -1: 1984) - Water quality - Determination of total cyanide;
TCVN 6494-1: 2011 (ISO 10304 -1: 2007) - Water quality - Determination of dissolved anions by liquid ion chromatography - Part 1: Determination of bromide, chloride, fluoride, nitrate, nitrite, phosphate and dissolved sulfates;
TCVN 6216: 1996 (ISO 6439: 1990) - Water quality - Determination of the phenol index - Spectrometric method using 4-aminoantipyrin after distillation;
TCVN 6199-1: 1995 (ISO 8165/1: 1992) - Water quality - Determination of selected bivalent phenols. Part 1: Gas chromatographic method after extraction enrichment;
TCVN 5070: 1995 - Water quality - Determination of volume method of petroleum and petroleum products;
TCVN 7875: 2008 - Water quality - Determination of oil and grease - Infrared irradiation method;