The laboratory assessment of sludge dewaterability is sensitive to the operating procedure adopted for the conditioning step. No generalized ranking of products in order of effectiveness can be given since the ranking changes with the sludge type, dosage of conditioning agent, degree of shearing and dewatering device. The scope of this European Standard applies for sludges and suspensions from:- storm water handling; - urban wastewater collecting systems; - urban wastewater treatment plants; - industrial wastewater that has been treated similarly to urban wastewater (as defined in Directive 91/271/EEC); - water supply plants. This method is applicable to sludge and suspensions of other origin.
EN 14742:2015 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 14701-4:2010 Characterization of sludges - Filtration properties - Part 4: Determination of the drainability of flocculated sludges
EN 15933:2012 Sludge, treated biowaste and soil - Determination of pH
EN 15935:2012 Sludge, treated biowaste, soil and waste - Determination of loss on ignition
ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
EN 14742:2015 history
2015EN 14742:2015 Characterization of sludges - Laboratory chemical conditioning procedure