Trickling Filter Train. Wastewater from Primary Settling Tanks One and Two flows to eight 1-19 foot diameter trickling filters. The trickling filters have rock media, tile under -drains and mechanically sealed rotary distributors. Secondary Settling Tanks. Before the water is released into Salt Creek, it is disinfected with chlorine.
Baffled chambers hold the water long enough to give the chlorine time to act.
The sections above describe basic treatment methods. However, large amounts of sludge which have been removed from the wastewater must still be processed. Here is how that is done. Sludge removed in the primary treatment process is pumped into a large tank called an anaerobic digester. The sludge decomposes in the tank before being pumped through the sludge tank and on to the filtering process.