Nitrogen removal and nitrogen-transformation bacteria in Cyperus alternifolius constructed wetland
JING Yuan-xiao1, YANG Dan-jing2
1. College of Life Science, South China Normal University, Guangzhou 510631, China; 2. Guangzhou Research Institute of Environmental Protection, Guangzhou 510620, China
Nitrogen removal and nitrogen-transformation bacteria in C.alternifolius contructed wetland wastewatertreatment system were studied. The removal rate of TN in the contructed wetland with C.alternifolius were 73.8%;Compared with unplanted constructed wetland system, the removal rate of TN raised 17.4%. The amount of ammonifyingbacteria, nitrobacteria and denitrifying bacteria in C.alternifolius constructed wetland were 7.98×105cfu·g-1(sand), 1.95×105MPN·g-1 (sand) and 5.89×104 MPN·g-1 (sand), respectively; In contrast to unplanting system, the amount of ammonifyingbacteria had no obvious difference,but the amount of nitrobacteria and denitrifying bacteria were 1 order of magnitude higherthan those in the unplanted system.