Process and system for simultaneous nitrification and denitrification

A process for simultaneous nitrification and denitrification of wastewater, the process comprising (i) subjecting mixed liquor to treatment within at least one membrane aerated bioreactor (MABR), to provide a MABR effluent;

• (ii) treating said MABR effluent within at least one aeration tank to provide an at least partially treated mixed liquor;
• and (iii) discharging said treated mixed liquor wherein treating said MABR effluent within the at least one aeration tank comprises controlling dissolved oxygen (DO) concentration to be within a concentration range that supports simultaneous nitrification and denitrification within said at least one aeration tank;
• wherein said treatment in said at least one MABR and said treatment in said at least one aeration tank are under condition to provide nitrification and denitrification without circulation of mixed liquor from said at least one aeration tank or from a location downstream of said aeration tank to said at least one MABR or to a chamber upstream of said at least one MABR;
• and wherein treatment within the at least one MABR and treatment within the at least one aeration tank is operated such that continuous simultaneous nitrification and denitrification (SND) is sustained throughout the entire operation of the at least one MABR and the at least one aeration tank.