TY - JOUR
T1 - 2,4,6-trichlorophenol (TCP) photobiodegradation and its effect on community structure
AU - Zhang, Yongming
AU - Pu, Xuejing
AU - Fang, Miaomiao
AU - Zhu, Jun
AU - Chen, Lujun
AU - Rittmann, Bruce
N1 - Funding Information:
Acknowledgments The authors acknowledge the financial support by the National Natural Science Foundation of China (50978164 and 50678102), the Special Foundation of Chinese Colleges and Universities Doctoral Discipline (20070270003), the Shanghai Leading Academic Discipline Project (S30406), and the United States National Science Foundation (0651794).
PY - 2012/7
Y1 - 2012/7
N2 - 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.
AB - 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.
KW - Biodegradation
KW - Biofilm
KW - Community structure
KW - Photolysis
KW - Trichlorophenol
UR - http://www.scopus.com/inward/record.url?scp=84864238771&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84864238771&partnerID=8YFLogxK
U2 - 10.1007/s10532-012-9534-0
DO - 10.1007/s10532-012-9534-0
M3 - Article
C2 - 22270690
AN - SCOPUS:84864238771
SN - 0923-9820
VL - 23
SP - 575
EP - 583
JO - Biodegradation
JF - Biodegradation
IS - 4
ER -