2. Main treatment routes
These two objectives, qualitative and quantitative, will be achieved through a series of unit operations involving volume reduction, dry matter degradation or stabilization.
Volume reduction is typically achieved through liquid/solid phase separation operations by decantation, filtration or evaporation, as encountered in thickening, dehydration and thermal drying techniques.
Degradation of the sludge's organic matter by biological processes (digestion, composting) or thermal processes (incineration at 850°C, wet oxidation of liquid sludge thickened under 45 bar at 250°C) will also lead to a smaller final volume.
In practical terms, stabilization is achieved by slowing down or even eliminating the putrid biodegradation of the sludge's organic matter, by various biological,...
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Main treatment routes
Overview of treatment processes
Bibliography
General works
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...
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