Number of Microbe and Relationship between It and Removal of Pollutants in Constructed Wetlands
In order to indicate the number of microbe and its impact on purification efficiencies of pollutants in constructed wetlands treating slightly polluted river water, two constructed wetlands planted with Arundo domax and Acorus calamus were built under field conditions, with an unplanted constructed wetland as a control. The results showed macrophyte played roles in improving removal of ammonium (NH4+-N) and total nitrogen (TN), but the impact was less on removal of total phosphorus (TP) and permanganate index (CODMn). Microbial quantity in bottom fillers was less than that in top fillers in constructed wetlands. There were significantly linear relationships between canonical variable of the number of microbe in top and bottom substrates in constructed wetland planted with Arundo domax (R2>0.9). The relationship between the number of microbe and water temperature was significantly positive, and the number of microbe could be improved by planting macrophyte. There was no significant positive correlation between the number of microbe and NH4+-N, TP and CODMn, except TN removal. Relationships between number of microbes and removal of TN could be stimulated by macrophyte, but the impact of macrophyte species on the microbial nitrogen removal process was not significantly.
NETL
NSTL
万方数据
维普
