Sludge De-Watering, Gravity filtration vs Vacuum Assist Filtration

Gravity filtration vs Vacuum Assist Filtration

A standard waste water sludge de-watering box uses gravity to separate the water from the solids by allowing the water to drain through the bottom screen leaving the solids on the filter media.    Once dry the solids are removed for disposal and the de-watering process is started over. You can also pull a vacuum on the same sludge de-watering box by attaching an Air Operated Diaphragm (AOD) pump on the drain line. This is called vacuum assist filtration. This will improve the speed of de-watering and will help to decrease the drying time. When you have an AOD pump on the drain line you should begin to see cracks in the drying sludge as it begins to dry. When you start to see cracks, you can add more sludge until the sludge de-watering box is full.

Coagulants and Flocculants

Note that sludge is generally conditioned by the addition of coagulants and flocculants before de-watering.

Air Operated Diaphragm (AOD)

If you purchase a standard de-watering box you can always add an AOD pump later. If you are having trouble de-watering, give us a call.