The F.L.I. Brightwater HSAF^® is a biological filter process unit designed to enable BOD and / or ammonia reduction in waste water.

In most applications the flow is pumped to the unit. The flow passes up through the aerated biological treatment zone of BMax^® media where the active bacterial population metabolises the effluent to reduce the overall Biological Oxygen Demand (BOD) and / or the ammonia. The air for the biological treatment is evenly distributed through each reactor by passing through a process air grid located at the base of the aerated biological treatment zone.

BMax^® media is a F.L.I. Brightwater engineered buoyant plastic media made from 100% recycled materials which can also be recycled at the end of the plant’s design life. The media configuration ensures biomass grows on, within and between the media. Suspended solids will also become entrapped by the biomass, and the media voidage. Treated effluent is collected through a simple launder system at the top of the reactor.

Over time biomass and feed solids accumulate in the reactor and need to be removed. An automated clean cycle is used. The clean cycle consists of an air scour and one or more desludge stages. The air scour works by passing additional air through the media. The scour air creates turbulence and fluidises the media releasing the excess solids and biomass. The reactor then undergoes a settlement period enabling the media bed to repack and the solids to collect at the base of the reactor. The excess solids are then removed from the base of the reactor prior to the reactor being put back online.

During normal operation the HSAF^® biological filter plant is a completely automated process and requires little maintenance or operator intervention.