Laboratory Pilot Setup
The small-scale laboratory pilot system will be assembled and configured as shown in Figure 1.  The system will have four pilot filters.  Two of the filters will receive ozonated water; and remaining two will receive water that was not pretreated with ozone.  The entire system will be fed using test water (see Task 4 Test Water) from a single day tank that is continuously cycled through a constant-head reservoir.  From this a portion of the water will flow by gravity through an ozonation column.  The effluent of the column will be pumped through two test filter columns using a dedicated pump for each column.  The remaining water will be pumped directly from the constant head tank through two control columns.  The entire pilot system will be located in a constant temperature chamber so that temperature can be controlled and examined as a process variable.

Columns will be filled with fresh GAC media of about 1 mm in size prior to the start of the acclimation phase.  Each column will be about 15 mm in diameter and 60 mm tall.  A target EBCT of 10 minutes results in a required total flow of 6-7 L/day through the four pilot GAC columns.  Half of this will be pre-ozonated, and an ozonation column overflow must be incorporated to allow for collection of ozonated water without disturbing the GAC column rates.  This overflow line will also allow the ozone contact time to be decoupled from the filtration rate.
The overall volume of test water needed to run the pilot for one year will be approximately about 2,800 liters.  At 2 mg/L DOC, the total amount of NOM that is required will be about 5.5 g-Carbon.

Figure1. Pilot Laboratory Setup