METHOD FOR OPERATING A MEMBRANE BIOREACTOR OF A WATER TREATMENT SYSTEM AND CORRESPONDING MEMBRANE BIOREACTOR AND WATER TREATMENT SYSTEM

摘要

Method for operating a membrane bioreactor of a water treatment system for water production and corresponding bioreactor and water treatment system. The MBR comprises a mixed liquor basin (2) and a membrane stack (4) with a plurality of UF or MF membrane modules (6) operable to produce a non-potable water stream. Depending on the incoming wastewater and the water production needs the method comprises a replacing step in which at least one UF or MF membrane module (6) is replaced by at least one corresponding semipermeable membrane module (8) in the same membrane stack (4). With the semipermeable membrane module (8) a forward osmosis step is carried out circulating a draw solution having a higher osmotic pressure than the osmotic pressure of said mixed liquor such as to produce a diluted draw solution stream downstream of said membrane stack (4).