NYCDEPCostAnalys isReport-0607 .pdf - New York-New Jersey ...

within the bed physically remove and store particulates from the waste stream. Sand or
anthracite is typically used for the media.
Secondary effluent is evenly applied to the filters at a constant flowrate per surface area, until
accumulated solids within the filter reduce the filtration rate (or rate of application). To restore
the filter, a backwash operation is performed with air and/or water to purge the media.
A schematic of the process is shown in Figure 1-5.
Figure 1-5: FSBNR-SF Process Configuration
1.1.8 Full Step BNR with Microfiltration/Ultrafiltration
The FSBNR with Microfiltration/Ultrafiltration (FSBNR-MF) process will provide all of the
components of FSBNR, in addition to a membrane filter process installed downstream of the
secondary treatment process to further enhance the removal of particulates in the wastewater.
Filtered secondary effluent would be extracted through the membranes as a permeate. Compared
to filtration, the removals are greater due to typical pore sizes between 0.1 to 0.2 m.
A schematic of the process is shown in Figure 1-6.