원문정보
초록
영어
Biological phenol treatment has attracted great attention due to its environmentally friendly approach and its ability to mineralize toxic organic compounds completely1). However, phenol degradation by microorganisms is generally limited by substrate inhibition and low specific conversion rates2,3). These drawbacks can be partly overcome by immobilization2,3).
A microorganism capable of degrading phenol was isolated from crude oil contaminated soil and identified as Pseudomonas fluorescence. A porous polymer bead of PVA and Xanthan gum was chosen among several candidates as the best one for phenol degradation in terms of spherical bead formation, bead strength, agglomeration, the ability of phenol degradation and cell leakage.
Activated carbon was co-immobilized with the microorganism in the bead, which readily adsorbed phenol to decrease initial phenol concentration. With low phenol concentration acting on the microorganism, the cells needed shorter adaptation time after which the microorganism stably degraded phenol. When the bead containing 1 % of activated carbon was packed in a packed-bed bioreactor, the start-up period was shorter by 40 hours and the removal efficiency of phenol during the period was higher by 28 % than the bead without activated carbon.