The standard applies to sludge. The required content of undis olved components in the analysis sample depends on the purpose of the research, see 7. The described method has been developed for characterization of the dewaterability of sludge and selection of polyelectrolytes for dewatering with sieve belt presses [1,2,3 ].
NEN 6691-1988 history
1988NEN 6691-1988 Sludge - Determination of dewaterability by the MFT-method