Enhancing the design of the wet pit pumping stations based on experimental and numerical investigations

Beschreibung

The major role of Circular wet well pumping stations is the uninterrupted transportation of the sewage through the system to the next pumping station or all the way to the next treatment plants. The research aims to investigate the design features and operation conditions of the pumping station which affect the air entrainment, the sediment deposition and the pump clogging to suggest the appropriate design of the station. The primary research stage is concerned with the testing of the air entrainment and the minimum submergence. Five different inflow directions with the same sump geometries are investigated. It is shown that the tangential inflow directions need the smallest submergence over the flow rates range. It is clear that the tangential pipe leads the bubbles away from the pump and changes the form and the area of the inlet jet at the impact point, which reduces the penetration depth of the jet. Laboratory tests are used to demonstrate that there is an association between the sedimentation field and the inlet direction depending on the working conditions represented by the flow rate and the submergence. The removing efficiency measurement confirms that increasing the flow rate enhances significantly the removing efficiency of the tangential inflows comparing to radial one. A new sump configuration is also assessed using the removing efficiency. The clogging behaviour of the pump is tested using the efficiency ratio. The efficiency ratio is a measure of the change in the pump characteristic because of pumping wastewater. The tests indicate that the clogging behaviour of the pump is dominated mainly by the pump characteristics rather than the inlet direction. This allows to draw general recommendation about the design of wet pit pumping station.

Autor*in

Raja Abou Ackl

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efficiency ratio pumping station sewage treatment plants wastewater wet pit pumping stations

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