2. Treatment steps

2.1 Pretreatment

Any pollution control treatment must include what is commonly referred to as "pre-treatment", which consists of a number of mechanical or physical operations designed to extract as many elements as possible, the nature and size of which would later constitute a nuisance. These operations are: screening, grit removal and oil removal.

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2.1.1 Screening

Raw water passes through grates made up of bars placed vertically or at an angle of 60...

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Bibliography

General works

BECHAC (J.-P.), BOUTIN (P.), MERCIER (B.), NUER (P.) - Traitement des eaux usées - . Eyrolles (1987).
Degrémont - Mémento technique de l'eau - . 10e éd., 2 vol., Lavoisier (2005).
...

Standardization

French Standards Association (Afnor)

Site : http://www.afnor.fr

Qualité de l'eau. Détermination de la demande chimique en oxygène (DCO). - NF T90-101 - 2001
Qualité de l'eau. Dosage des matières en suspension. Méthode par centrifugation. - NF T90-105-2 - 1997
Qualité de l'eau. Dosage du phosphore. Dosage spectrométrique...

Regulations

These new French standards are based on Decree no. 94-469 of June 3, 1994, the Decrees of December 22, 1994 and the recommendations of the French Ministry of the Environment dated May 12, 1995 concerning urban wastewater treatment and taking into account the European Community directive, as well as the DE/SDPGE/BLP circular of November 6, 2000 concerning the monitoring of wastewater collection and treatment facilities referred...