This European Standard specifies a method for the determination of the gross calorific value of sludge at constant volume and at the reference temperature 25 ℃ in a bomb calorimeter calibrated by combustion of certified benzoic acid. The result obtained is the gross calorific value of the sample at constant volume with both the water of the combustion products and the moisture of the sludge as liquid water. In practice, sludges are burned at constant (atmospheric) pressure and the water is not condensed but is removed as vapour with the flue gases. Under these conditions, the operative heat of combustion to be used is the net calorific value of the fuel at constant pressure. InThis European Standard the net calorific value at constant volume is described as it requires less additional determinations.This method is applicable to all kinds of sludges.
EN 15170:2008 Referenced Document
EN 12832:1999 Characterisation of Sludges - Utilisation and Disposal of Sludges - Vocabulary
EN 12880:2000 Characterization of sludges - Determination of dry residue and water content
EN ISO 16720:2007 Soil quality - Pretreatment of samples by freeze-drying for subsequent analysis
ISO 1770:1981 Solid-stem general purpose thermometers
ISO 1771:1981 Enclosed-scale general purpose thermometers