Current management practices of FSE wastewater include treatment in the form of biological additives to process the FOG material into benign end products or passive separators to collect it. Discharges from FSEs are known to represent a major source of FOG deposits in sewers and hence area focus for managing their discharges. Suspended and emulsified FOGs are discharged into sewer systems from both domestic and commercial premises and are attributed to cause a significant proportion of the deposits (solidified and saponified) forming sewer blockages (Williams et al., 1995). The term FOG (fat, oil and grease) encompasses a number of different materials (liquid and solid) and describes a heterogeneous group of chemicals including tri-, di- and mono-glycerides, sterols, non-volatile hydrocarbons, waxes and other complex lipids which exist in a combination of free and emulsified forms.
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