Abstract
Both lab-scale (50L/day) and pilot-scale (10m3/day) ceramic membrane bioreactors (CMBRs), equipped with two additional implements (step-feeding and internal recycling), have been tested for the removal of nitrogen and organic matter from municipal wastewater. During the 180days of operation, 0.5Q of step-feeding increased the removal rate of total nitrogen by 46.2% in the lab-scale CMBR, whereas a 59.0% increase was observed with the additional 3Q internal recycling in the pilot-scale CMBR. This was presumably due to the supply of insufficient carbon source as an electron donor in the denitrification stage. The ceramic membrane also exhibited high rigidity sufficient for periodic backwashing using the highly-pressurized permeate. A constant flux test with 30s of backwashing after every 9.5min of filtration successfully removed foulants from the pores of the ceramic membrane, and instantaneously restored the trans-membrane pressure (TMP). During the test, the TMP in case of without the hydraulic backwashing steadily increased (20–80kPa) for 40min, whereas it took more than two times to reach the same TMP in the case of with the hydraulic backwashing, which eventually doubled the time span between required chemical washings.
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