Abstract
A novel design for a pilot scale anaerobic submerged membrane bioreactor (AnSMBR) equipped with an ultrafiltration unit, treating municipal wastewater at 18±2°C, and inoculated with a mesophilic inoculum without acclimation, was implemented and evaluated over 3years of stable operation. The AnSMBR operated with a volumetric loading rate between 1.6 to 2.0kgCOD/m3UASBd, 12.8 to 14.2h hydraulic retention time, and reached a tCOD removal efficiency of around 90%. Biosolid production was between 0.05 and 0.083gVS/gCODremoved. Dissolved methane oversaturation in the effluent was observed, reaching average values of 19.1±0.84mgCH4/L. The permeate flow rate ranged from 10 to 14L/m2h with trans-membrane pressure (TMP) values of 400–550mbar, using cycles of 30s backwash, 7.5min filtration, and continuous biogas sparging (9–16m/h). During the three years of continuous operation, the membrane was not physically or chemically cleaned.
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