紫外光与生物膜降解三氯酚及其微生物群落的变化

his study evaluates the mechanisms occurring in a photolytic circulating-bed biofilm reactor (PCBBR) treating 2,4,6-trichlorophenol (TCP) by using batch experiments following three protocols: photodegradation alone (P), biodegradation alone (B), and intimately coupled photodegradation and biodegradation (P&B). TCP was removed more rapidly by P&B than by either P or B alone in the PCBBR. Initially, the ceramic particles used as biofilm carriers rapidly adsorbed TCP in the B experiments, but biodegradation dominated thereafter. During the first 10 minutes, the TCP removal rate for P&B was equal to the sum of the rates for P and B. As the experiments continued, P&B continued to have the greatest TCP removal, although the difference with P narrowed as the TCP concentration approached zero in the P&B experiments. The acclimated inoculum and the biofilm in the P&B carriers were examined by clone libraries to evaluate the impacts of intimately coupled photobiodegradation of TCP on community structure. The dominant members of the bacterial community changed dramatically after the P&B experiments. Whereas Burkholderia xenovorans, a known degrader of chlorinated aromatics, was the dominant strain in the inoculum, it was replaced in the P&B biofilm by strains noted for biofilm formation and biodegrading non-chlorinated aromatics.?????