Temporal Variability of Chemical Characteristics of SLUDGES Incinerated Ashes
Sludges incinerated ashes (SIA) chemicals characteristics, particularly phosphorus and metal trace elements (MTE)
concentrations, are the principal factors limiting their agricultural recycling potential. Chemical properties of SIA vary widely
from one another, and this variability may have significant consequences on their recycling in agriculture. Seasonal variability
of SIA chemical characteristics has been studied from 2009 to 2015. These SIA come from a mono-incinerator located at
Longueuil in the province of Québec, Canada. Results show that SIA phosphorus and MTE concentrations vary widely within
and among years. Highest phosphorus concentrations were found during the winter seasons, and lowest concentrations during
spring. Compared to phosphorus, MTE concentrations variability was lower, except for Pb, Cd and Zn. SIA MTE
concentration is generally within the quality criteria for land application.
Keywords - P Fertilizer, Metal Trace Elements, Seasonal Variability, P Recycling, Sewage Sludge Ash, Biosolids.