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4. Sludge thickening
Thickening is the first phase in the sludge treatment process. It is a simple method requiring low energy consumption. Its main purpose is to reduce the initial volume of sludge prior to treatment, and serves as a preparation for subsequent stages. The degree of desiccation can be as low as 10% MS.
Various techniques can be used to thicken sludge, including :
thickening by gravity, which occurs by settling or sedimentation;
dynamic thickening, which can include: flotation, centrifugation, use of a drainage system, grids or draining tables....
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Sludge thickening
Sludge dewatering
Bibliography
Websites
ADEME website – Pages about sewage sludge : http://www.ademe.fr/partenaires/boues/pages/chap14.htm
Sludge regulations
Source: Syndicat Mixte Recyclage Agricole du Haut-Rhin website – SMRA68 – consulted in March 2024
The spreading of organic waste products is...
Standards and norms
- Organic amendments – Composts containing materials of agronomic interest, derived from water treatment – Mandatory standard - NFU 44-095 -
- Fertilizer with mixed characteristics – Organic amendment-fertilizer – Composts containing materials of agronomic interest from water treatment with a P2O5 content equal to or greater than 3%. – Mandatory standard - NFU 44-295 -
- Organic amendments – Designations,...
Regulations
Order of 08/01/98 modified on 03/06/98 laying down technical requirements applicable to sludge spreading on agricultural land.
Decree of 09/09/97 modified on 19/01/06 relating to non-hazardous waste storage facilities: category D. According to Appendix II, sludge is authorized for burial in class II landfills if it contains at least 30% dry matter.
Decree of August 17, 1998,...
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