Accounting GHG emissions from sludge treatment and disposal routes: Methodological problems focused on sludge land spreading in agriculture

A.L. Reverdy (1) , Marilys Pradel (1)

1 UR TSCF - Technologies et systèmes d'information pour les agrosystèmes

In France, more than 70% of sewage sludge is directly land spreading or composted before land spreading. Sludge application is responsible of greenhouse gases (GHG) emissions. In 2010 and 2011, Irstea produces a tool called GESTABoues to quantify GHG emissions emitted during sludge treatment and disposal routes. This paper aims to present how this tool can be used to quantify GHG emissions of sludge land spreading of a 380 000 per captia equivalent wastewater treatment plant (WWTP) and to point out methodological aspects that could invert results of GHG emissions. Conclusions in GHG emissions results could vary depending on the system boundaries used, especially regarding additional fertilisation with mineral fertilisers and could be responsible for possible misunderstanding in conclusions of environmental assessment.

Mots clés: EPANDAGE DES BOUES; AGRICULTURE; GAZ A EFFET DE SERRE; ENVIRONNEMENT; TRAITEMENT DES BOUES; FERTILISATION MINERALE

Domaines: Sciences de l'environnement

A.L. Reverdy, Marilys Pradel. Accounting GHG emissions from sludge treatment and disposal routes: Methodological problems focused on sludge land spreading in agriculture. 15th International Conference Ramiran, Jun 2013, Versailles, France. 4 p. ⟨hal-00947974⟩