Screen Handling and Oil/ Grease Removal

Screenings Handling

In mechanically cleaned screen installations, screenings are typically discharged from the screening unit onto a traveling belt conveyor or a hydraulic transport system or pneumatic ejector system. Screenings can also be discharged directly into a screenings grinder, a pneumatic ejector or a container for disposal.

Screenings compactors can be used to dewater and reduce the volume of screenings. Compactors can reduce the water content of the screenings by up to 50 percent and the volume by up to 75 percent.

Means of disposal of screenings include (1) removal by hauling to disposal areas, (2) disposal by burial on the plant site (small installations only), (3) incineration either alone or in combination with sludge and grit (large installations only) and (4) discharge to grinders or macerators where they are ground and returned to the wastewater.

Fat/Oil/Grease Separation

Fat, oil and grease can cause pollution in receiving environments. When large amounts of oils and greases are discharged into receiving waters, they increase BOD and float to the surface causing unpleasant conditions.

Types of oil/water separators include: grease traps, skimmers, hydro cyclones, centrifuges and dissolved air floatation units.

Frequent inspections should be made of the separation system and all associated piping and valves, and sludge and oil need to be periodically removed.

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PROTEC is a privately owned company established in Doha, Qatar engaged in the fields of Engineering, Supply, Construction, Installation, Commissioning, Operation and Maintenance of various types of equipment for the Water, Waste Water, Energy, and Industrial markets.


Head Quarters: Middle East,
Africa & CIS

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