How Do Dewatering Systems Work?
Dewatering Treatment Systems are used to remove water from solid material or soil. Dewatering may be utilized before subterranean excavation for foundations, shoring or to lower the water table for construction projects.
A Dewatering Treatment System usually consists of the following:
- Dewatering Pump
- Holding Tank
- Transfer Pump
- Mechanical Filtration
- Media Vessels
- Flow Meter
When the Dewatering process begins, the water is removed from the ground by using a submersible pump or well point system where the water is pumped into the Holding Tank. The holding tank allows the larger solids to settle prior to entering the treatment system. The water is then pumped through the system using a transfer pump and is activated by a float system located in the holding tank.
Depending on the amount of solids in the groundwater a sand filter may be needed to help reduce the particulate loading in the bag filters. The sand filters have an automated backwash sequence which reduces the maintenance requirements of the system. Bag filters are installed downstream of the sand filter to remove the solids down to the acceptable level for discharge.
Even though the solids have been removed from the water during the mechanical filtration process, the groundwater still may not meet the discharge requirements due to the dissolved contaminants. This process is done by installing media vessels downstream of the bag filters where VOC’s, metals, nutrients, and other constituents can be removed from the water. The types of media used are Granulated Activated Carbon (GAC), Ion Exchange Resin and other natural & synthetic medias. There are hundreds of different types of medias and each one of them serves a purpose. This means there is no one “fix all” media.
The last step in the dewatering process before discharge is the Flow Meter. The flow meter measures the flow rate and record the number of gallons of water that have been treated by the system. Once the water has been through the entire Dewatering Treatment System it is then discharged according to the permit requirements.
To learn more about Dewatering Treatment Systems Contact Pure Effect, Inc. today.