Combining upflow anaerobic sludge blanket (UASB) reactors and submerged aerated biofilters for secondary domestic wastewater treatment

摘要

This work evaluates the theoretical availability of energy and the sludge production in a wastewater treatment plant (WWTP) that associates UASB reactors and submerged aerated biofilters (BF). A comparison among the behaviour of a pilot plant operating under constant hydraulic load (trial 1) and under hourly variation of hydraulic load, with sludge recirculation from the BF to the UASB (trial 2), was carried out. The results show that it is possible to suppress complementary units of thickening and digestion, once the sludge in the bottom of the UASB reaches concentrations of 4, 5