A new Trickling Filter / Solids Contact (TF/SC) process was designed, constructed, and commissioned for the City of Hayward, CA in the 2000 -2010 decade. Modern design features were employed for system components that provide flexible and energy efficient process control. The design included further development of a TF biofilm predator control system that provides operators with opportunities to inhibit proliferation of snails and other nuisance organisms in the TF system. Commissioning experience provided a notable confirmation of the effect of TF organic loading on the bioflocculation performance of the coupled solids contact process.

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