Vertical Flow Constructed Wetland Spherical Light Ceramsite Substrate Nitrogen Factor Research

Haydite as filler, selecting canna as wetland plant denitrification effect of vertical flow constructed wetland research. In terms of the mechanism of denitrification, in view of the ceramsite adsorption, microbiological nitrification and denitrification reaction, plants absorb test in three aspects and to study the effect of various factors. Adsorption experiment, ceramsite to NH4+_N adsorption reached the maximum at 4 h, adsorption intensity is 0.0045 mg/g, device of NH4+_N in the running 92 days maximum theory is 1296 g. Microbial average intensity of nitration was 0.750 mg.h-1.kg-1. The denitrifying intensity of 1.090 mg.h-1.kg-1. Canna root, stem and leaf nitrogen content were increased by 7.73%, 7.73% and 9.92% per plant cannas average of 1.189 g, nitrogen absorption during the running period of 10 plants absorb about 11.89 g. Vertical flow constructed wetland, the choice of spherical light ceramsite substrate adsorption strength, suitable for packing of wetland. Canna better effect on the absorption of nitrogen, of the three microbes plays a main role for denitrification.