After contaminated sediment is dredged from the river it is pumped through a pipeline anchored along the bottom of the river to the Green Bay Processing Facility. There it goes through several processing steps before being shipped to a landfill. (Click here for a more detailed look at the dewatering and filter cake processing.)
The first step for processing the sediment is to remove the sand and coarser material. Much of this sand will be used without further treatment at the processing site for fill or potentially off site as fill or other uses.
The remaining finer grained sediment is pumped to the filter presses, which squeezes the water out and produces a "filter cake."
The water removed from the sediment slurry is treated through a series of filters. The treated water is used in the processing facility or returned to the river.
The filter cake is stored inside the facility and loaded onto trucks inside the facility. The trucks are washed, if needed, before leaving the building and are fully covered as they take the filter cake to Hickory Meadows Landfill in Calumet County. A small amount of filter cake will come from sediment containing higher levels of PCBs. This filter cake is transported to a landfill that is licensed for disposal of such material.
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