Nitrogen removal and nitrogen-transformation bacteria in Cyperus alternifolius constructed wetland

Nitrogen removal and nitrogen-transformation bacteria in C.alternifolius contructed wetland wastewater treatment 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 ammonifying bacteria, nitrobacteria and denitrifying bacteria in C.alternifolius constructed wetland were 7.98×10~5cfu·g~(-1)(sand), 1.95×10~5 MPN·g~(-1) (sand) and 5.89×10~4 MPN·g~(-1) (sand), respectively; In contrast to unplanting system, the amount of ammonifying bacteria had no obvious difference,but the amount of nitrobacteria and denitrifying bacteria were 1 order of magnitude higher than those in the unplanted system.