New Self Cleaning Sump for Wastewater

A new and patented “Self Cleaning Sump” is now available in
Australia through Hydro Innovations. Developed by Hydro-Plus of Belgium in
conjunction with Gorman-Rupp, the self cleaning sump is said to address many of
the issues confronting owners of sewage pump station assets.

The issues confronting asset owners include high capital
costs, high energy consumption, and the cost of intervention for the likes of
sediment, solids or fat build-up or for removing chokes from pumps. Operator
safety is also an ever present issue with ever changing regulations.

The self cleaning sump concept has been developed to address
these issues. The conventional 2-3m diameter cylindrical wet well is replaced
by an inclined collector pipe from which self priming pump suction lines access
the wastewater. Nothing electrical or mechanical is in the self cleaning sump
[SCS]. This system is used in conjunction with VFD controlled pumps and an air
bubbler liquid level control system to reduce energy consumption over the
conventional DOL or soft starting pump systems.

The philosophy behind the system is to keep solids
[sediment, fat, rags etc] in suspension and moving, and to take all issues
associated with operator intervention [maintenance, blockage removal etc] to
the surface where it is easier and safer for operators to address.

Keeping the solid matter in suspension and removing it
quickly, does not allow time for fibres and rags to ball and mat together or
allow sediment or fat to build up. This should reduce the incidence of pump
blockage caused by balling rags and greatly reduce the need for “vac truck”

And because pumps are mounted on the surface, there is no
need for operators to open wet well lids [exposing them to falls and/or
drowning] or employ lifting devices [exposing them to heavy swinging weights
and the associated dangers of working with cranes]. This makes any sort of
intervention much easier and safer for operators. Blockage removal, clearance
adjustments, oil inspection or changes, valve greasing or exercising can all be
done safely by one operator working out of a standard vehicle [not a crane
truck with an additional person or two].

The civil construction costs are also said to be much lower
using this system because of the inexpensive HDPE collector pipe [much cheaper
than a full concrete wet well/valve vault combination] and the smaller
excavation footprint.

More information, including a white paper, can
be obtained from Hydro Innovations at

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