3. Overview of treatment processes

3.1 Sludge stabilization

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3.1.1 Lime stabilization

Chemical stabilization of dewatered sludge is a unitary sludge treatment operation following the dewatering stage. It is therefore carried out on pasty sludge. The reagent used is essentially lime.

This is the final step in sludge treatment: limed sludge is then discharged from the plant for agricultural use, or may be disposed of in a landfill for ordinary or similar waste (e.g. "class II landfill"), but is rarely incinerated.

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Overview of treatment processes

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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).
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Regulations

Décret n° 94-469 du 3 juin 1994 relatif à la collecte et au traitement des eaux usées mentionnées aux articles L. 372-1-1 et L. 372-3 du code des communes [NOR : ENVE9420024D] (JORF n° 131 du 8 juin 1994, page 8).

Décret n° 97-1133 du 8 décembre 1997 relatif à l'épandage des boues issues du traitement des eaux usées [NOR : ATEE9750078D] (JORF n° 286 du 10 décembre 1997, page 17822).

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Standards and norms

Wastewater treatment plants – Part 8: Sludge storage and treatment (classification index: P16-700-8) - NF EN 12255-8 - 2001
Sludge characterization – Sedimentation properties – Part 2: Determination of thickenability (classification index: X33-027-2) - NF EN 14702-2 - 2006
Sludge characterization – Enumeration and viability of helminth parasite eggs – Method using a triple flotation technique (classification...