水力负荷对人工湿地修复富营养化景观水体效果的影响

Study on the effects of hydraulic loading rates on restoration of eutrophicated landscape water by constructed wetlands

水力负荷对湿地的去污效果有直接影响,但目前的研究一般限于去除率方面,缺少对污染物去除总量影响的研究。为综合考察水力负荷对人工湿地修复富营养化景观水体效果的影响,以某会议中心富营养化景观水体生态修复工程中的2#人工湿地为研究对象,研究了其在水力负荷分别为1.03、1.37m/d时的水质净化效果。结果表明:当水力负荷由1.03m/d提高到1.37m/d时,2#人工湿地仍具有较好的COD、TN和TP去除效果;COD和TN的总平均去除率略有下降,但水力负荷为1.37m/d时的COD和TN总平均去除量比水力负荷为1.03m/d时总平均去除量分别高28.29%和20.96%,对COD和TN总量的控制效果显著;TP的去除受水力负荷的影响较小,在两种水力负荷条件下均具有较高的去除率。

Hydraulic loading directly affects the purification efficiency of constructed wetlands, however, the previous researches mainly focused on influence on pollutant removal efficiency, lack of concerns about the influence on total removal amount. In order to have overall considerations about the influence of hydraulic loading on the effect of landscape water remediation by constructed wetlands,a constructed wetland named 2# ,which located in a conference center, was taken as the study object, and its water quality improvement performance was detected under hydraulic loading rates of 1.03 m/d and 1.37 m/d. Results showed that when the hydraulic loading rate was enhanced from 1.03 m/d to 1.37 m/d, constructed wetland 2 ~ still removed COD, TN and TP effectively,although the average removal efficiencies of COD and TN declined slightly, the removal amounts of COD and TN increased by 28.29% and 20.96 %, respectively,which indicated that the total removal amount of COD and TN was obvious when the hydraulic loading rate was increased appropriately. TP removal efficiency was less affected by the hydraulic loading rate. Con- structed wetland 2% had good phosphorus removal effects in either case.