Scum has some detrimental impacts on the operation of
wastewater treatment plants. It can clog wastewater treatment
systems and result in the flotation of sludge in thickening units.
Significant amounts of fats, oil, grease or lipid in sludge can affect
both aerobic and anaerobic processes (Chipasa and Medrzycka,
2006), inhibit methanogenesis during anaerobic digestion
(Luostarinen et al., 2009; Carucci et al., 2005), and clog sludge
dewatering equipment when scum is pumped to the waste sludge
treatment system along with the sludge. Thus, scum must be
skimmed off the surface of the wastewater at the beginning of
the wastewater treatment process using the grit chambers.
Scum has some detrimental impacts on the operation ofwastewater treatment plants. It can clog wastewater treatmentsystems and result in the flotation of sludge in thickening units.Significant amounts of fats, oil, grease or lipid in sludge can affectboth aerobic and anaerobic processes (Chipasa and Medrzycka,2006), inhibit methanogenesis during anaerobic digestion(Luostarinen et al., 2009; Carucci et al., 2005), and clog sludgedewatering equipment when scum is pumped to the waste sludgetreatment system along with the sludge. Thus, scum must beskimmed off the surface of the wastewater at the beginning ofthe wastewater treatment process using the grit chambers.
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