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5. Sludge dewatering
Dewatering is the second phase in sludge volume reduction. It is carried out on both stabilized and non-stabilized sludge. The aim of dewatering is to achieve an average MS content of between 20% and 30%.
This treatment stage offers several significant benefits. Firstly, by reducing the volume of sludge, it greatly facilitates its storage, which has a direct impact on the management and maintenance costs of these storage sites. In addition, volume reduction through dewatering reduces the cost of transporting these materials. Sludge stabilization is also improved. Dry sludge tends to be less prone to decomposition and can be stored for longer, increasing its safe residence time and reducing the risk of nuisances associated with putrefaction.
Finally, the agricultural use of treated sludge is greatly facilitated by dewatering. Dry sludge is...
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Sludge dewatering
Sludge reduction processes at source
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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