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6. Regulations and standards
Discharges subject to provisions for suspended solids (SS) require turbidity measurement to estimate the SS content, in agreement with DRIRE and water agencies. On physico-chemical industrial wastewater treatment plants, turbidity is an indicator of the proper functioning of the settling process. In activated sludge urban wastewater treatment plants in particular, it is also an indicator of the proper functioning of final settling (clarification), and a good estimate of TSS and COD (chemical oxygen demand). These measurements are governed by ministerial decrees. .
The main problems encountered concern the representativeness of the sample, and are as follows:
non-homogeneity of the vein with respect to turbidity: floats on the surface and heavy materials on the bottom;
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Regulations and standards
Fields of application
Bibliography
References
Glossary
Turbidity: the reduction in transparency of a liquid due to the presence of undissolved matter (NF EN ISO 7027 standard).
The definitions below are taken from FD ISO GUIDE 30.
Reference material (RM): material or substance for which one or more property values are sufficiently homogeneous and well defined to enable it to...
Regulations
Ministerial Order of February 2, 1998, published in the Journal Officiel of March 3, 1998
* Section III – Surface water pollution
Article 31
For receiving waters to which the provisions of Decree no. 91-1283 of December 19, 1991 apply, the effects of discharge must comply with the following provisions: no increase of more than 30% in suspended solids.
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Standardization
- Water quality – Turbidity determination. - NF EN ISO 7027 - (mars 2000)
- Qualité de l'eau. Échantillonnage. Partie 1 : lignes directrices pour la conception des programmes et des techniques d'échantillonnage. - NF EN ISO 5667-1 - 2007
- Qualité de l'eau. Échantillonnage. Partie 3 : lignes directrices pour la conservation et la manipulation des échantillons d'eau. - NF EN ISO 5667-3 - 2004
- Qualité de l'eau....
Manufacturers and distributors
Table 1 lists the main equipment manufacturers and their distributors.
Organizations
Association of Measurement, Control and Automation Equipment Operators (Exera) http://www.exera.com/
ISA Instrumentation, Systems and Automation Society http://www.isa.org
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