Wastewater treatment with membrane aerated biofilm and anaerobic digester

摘要

A wastewater treatment system (10) is disclosed having a first solid- liquid separation unit (20), a membrane aerated biofilm (MABR) reactor (22), a second solid-liquid separation unit (24) and an anaerobic digester (16). Waste sludges (54) from the solid-liquid separation units (20, 24) are treated in the anaerobic digester. The solid-liquid separation unit preferable comprises a micro- sieve. The treatment system may also comprise an aerated contact tank with a hydraulic retention time of 6 hours or less. Optionally, the MABR may comprise a membrane filtration unit.