Is it Worthwhile to Measure the Sludge Level During Primary Treatment?
Using measurements of the sludge level and
the dried solid content, the removal of
primary sludge from the primary settlement
tanks can be optimised to suit the hydraulic
and weather-related conditions. Load-related
removal facilitates more balanced charging
of the digester and a more constant
rate of gas production for downstream
block-type thermal power stations (BTPS).
If neither pre-thickeners nor mechanical
pre-thickening are used, the volume of
sludge can be significantly reduced.
This is highly beneficial in terms of the
savings in pump energy and in heat
energy for the digestion process.