2,4,6-trichlorophenol (TCP) photobiodegradation and its effect on community structure |
| |
Authors: | Zhang Yongming Pu Xuejing Fang Miaomiao Zhu Jun Chen Lujun Rittmann Bruce E |
| |
Institution: | Department of Environmental Engineering, College of Life and Environmental Science, Shanghai Normal University, 200234, Shanghai, People's Republic of China. zhym@shnu.edu.cn |
| |
Abstract: | The mechanisms occurring in a photolytic circulating-bed biofilm reactor (PCBBR) treating 2,4,6-trichlorophenol (TCP) were investigated using batch experiments following three protocols: photodegradation alone (P), biodegradation alone (B), and intimately coupled photodegradation and biodegradation (P&B). Initially, the ceramic particles used as biofilm carriers rapidly adsorbed TCP, particularly in the B experiments. During the first 10 min, the TCP removal rate for P&B was equal to the sum of the rates for P and B, and P&B continued to have the greatest TCP removal, with the TCP concentration approaching zero only in the P&B experiments. When phenol, an easily biodegradable compound, was added along with TCP in order to promote TCP mineralization by means of secondary utilization, P&B was superior to P and B in terms of mineralization of TCP, giving 95% removal of chemical oxygen demand (COD). The microbial communities, examined by clone libraries, changed dramatically during the P&B experiments. Whereas Burkholderia xenovorans, a known degrader of chlorinated aromatics, was the dominant strain in the TCP-acclimated inoculum, it was replaced in the P&B biofilm by strains noted for biofilm formation and biodegrading non-chlorinated aromatics. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|