Abstract
The Membrane Aerated Biofilm Reactor (MABR) is an attractive alternative for the removal of nitrogen from wastewater because of its ability to overcome the inherent limitations of conventional systems. But in MABR, the denitrification performance is low at low Hydraulic Retention Times (HRT). Therefore, a modified MABR which uses Polyvinyl Alcohol (PVA) gel beads as bio-carriers was used in this study to enhance the Total Nitrogen (TN) removal efficiency when treating domestic wastewater.By adding PVA-Gel in the MABR, the nitrification and TN removal performances increased by 14% and 13.4% respectively. At 12 h HRT and COD/N = 6, it had a maximum TN removal efficiency of 68.63%. The COD removal performance was always above 90.2%. Moreover, in contrast to a conventional MABR, the nitrification rate had an upward trend when the COD/N ratio was increased and/or when the HRT was reduced. Above results concluded that PVA-Gel addition enhanced the MABR performance.
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