Problem

There are numerous items that are being released into the primary cell which do not decompose such as gravel, sand, hair, personal hygiene items, plastics, false teeth, unidentified items.

Although chemical products do help in the breakdown of sewage – no chemical is strong enough to dissolve these items and eventually build up on top of the inlet pipe restricting release of new sewage disbursement. This creates a back pressure on the system and could lead to a serious plug up of the pipe.

Solution

Dredging a cell is required to remove the mound build-up on top of the inlet pipe as well removal of this build-up adds capacity back into the cell. Normally the whole cell does not require dredging only the problem area therefore saves the community in the costly expense of rebuilding a new cell.

Set-up

The dredging system is easily transportable. The dredging set-up requires launching the dredge in the pond, set-up of traversing cabling system and a series of floating pipe and hoses to the dispose of the slurred material to a approved and contained drying bed.

Material

The dredge is equipped with a cutterhead which can delve down 15 feet below the effluent level.

The cutterhead will reach depths up to 15 feet. The hydraulic centrifugal pump provides the dislodging and lifting force removing the material in a liquid slurry form. Liquid slurry is pumped through a series of pipes and hoses. The dredge floats on pontoons and requires approximately 2 feet of effluent for flotation as well effluent to slur the solid material. Cells must have at least five feet of effluent for dredging which will allow the slope required for launching of the dredge from the banks.

Drying Beds

Pumping slurred material into a drying bed is the most cost effective method for disposing of the material. In most cases the community has an area that only requires minimum construction to contain the slurred material.

Other methods are available such as geo tech bags but this poses an added cost to the project.

After Dredging

Roy & Sons Dredging Services have completed this dredging procedure in over 200 communities. Our clients have expressed that they have noticed a difference in the lift station, pumps are not running continuously, with the added capacity they don’t have to request permission for extra draining and overall they have noticed a difference in the facility.