Wastewater with suspended solids should be pretreated in a settling tank. A correctly designed settling tank should provide optimal treatment effectiveness and sufficient storage capacity for suspended solids (choosing a separator with a settling tank). Large solids suspended in wastewater have to be separated by baskets, sieves or other separating devices.
A settling tank can be a single-standing device (See: Settling Tanks) or can be integrated with a grease separator.
The purpose of using a set of integrated devices reduces space required for installation while providing high level of grease and suspended solids separation. Such devices can be found mainly in highly-urbanised areas.
Grease separators EST-H
Grease separators for organic grease (EST) are most often used for pretreating of wastewater coming from food industry facilities. They are typically used at restaurants, canteens, meat packing plants, dairies and other facilities that produce wastewater containing grease particles (according to PN-EN 1825 grease is defined as plant and animal fats and oils insoluble or having little solubility in water with the tendency to saponify).