Membrane module for gas transfer and membrane supported biofilm process

A reactor for treating wastewater to reduce concentrations of one or more of BOD, COD, nitrogen and phosphorous comprising,

• (a) a first section containing a plurality of gas transfer membrane modules connected to an oxygen source operable to cultivate a biofilm on the surface of the gas transfer membranes having aerobic and anoxic zones while not disturbing an anaerobic condition existing in the first section generally,
• (b) a second section having an oxygen source operable to create aerobic conditions in the second section;
• (d) a wastewater inlet to the first section;
• (e) an outlet from the second section;
• and,
• (f) a passage from the first section to the second section and a second passage from the second section to the first section,
• wherein wastewater enters the reactor through the inlet and flows through the reactor so as to be treated in the anaerobic section, the aerobic section and by contact with the biofilm before leaving the reactor through the outlet.