Title of article :
Towards integrated operation of membrane bioreactors: Effects of aeration on biological and filtration performance
Author/Authors :
Dalmau، نويسنده , , M. and Monclْs، نويسنده , , H. and Gabarrَn، نويسنده , , S. and Rodriguez-Roda، نويسنده , , I. and Comas، نويسنده , , J.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Abstract :
Two experimental studies evaluated the effect of aerobic and membrane aeration changes on sludge properties, biological nutrient removal and filtration processes in a pilot plant membrane bioreactor. The optimal operating conditions were found at an aerobic dissolved oxygen set-point (DO) of 0.5 mg O2 L−1 and a membrane specific aeration demand (SADm) of 1 m h−1, where membrane aeration can be used for nitrification. Under these conditions, a total flow reduction of 42% was achieved (75% energy reduction) without compromising nutrient removal efficiencies, maintaining sludge characteristics and controlled filtration. Below these optimal operating conditions, the nutrient removal efficiency was reduced, increasing 20% for soluble microbial products, 14% for capillarity suction time and reducing a 15% for filterability. Below this DO set-point, fouling increased with a transmembrane pressure 75% higher. SADm below 1 m h−1 doubled the values of transmembrane pressure, without recovery after achieving the initial conditions.
Keywords :
FOULING , Aeration , Energy Savings , Biological Nutrient Removal , Membrane bioreactors
Journal title :
Bioresource Technology
Journal title :
Bioresource Technology