不同生态浮床对景观水质的净化效果

【目的】明确不同生态浮床改善亚热带地区景观水质的效果,为我国南方地区应用生态浮床技术修复生态水环境提供参考依据。【方法】对比分析不同生态浮床对景观水体化学需氧量(COD)、总磷(TP)、总氮(TN)、氨氮(NH4+-N)去除能力及浮床植物生长状况的影响。【结果】美人蕉、鸢尾、花叶芦竹均能适应较高有机物及氮、磷浓度的水体,具有良好的适应性,对水体COD、TP、TN及NH4+-N也表现出良好的去除能力,但以美人蕉的净化效果最佳。美人蕉+组合填料生态浮床、美人蕉生态浮床、组合填料浮床对水体COD、TP、TN及NH4+-N的去除能力分别为33.75~48.98、0.23~0.93、3.71~10.26和4.12~8.44 mg/m2,3种不同生态浮床对水体COD、TP、TN和NH4+-N的去除能力存在极显著差异(P<0.01),去除能力排序为美人蕉+组合填料生态浮床>美人蕉生态浮床>组合填料浮床。【结论】美人蕉+组合填料生态浮床对水体COD、TP、TN及NH4+-N的去除效果最佳,较单一使用美人蕉生态浮床和组合填料浮床的净化效果更具优势,可作为我国南方地区修复生态水环境的首选生态浮床。

Purifying effect of different ecological floating beds on landscape water quality

Objective]The purifying effects of different ecological floating beds on landscape water quality in subtropi-cal area were investigated, in order to provide reference for using ecological floating bed to improve landscape water quali-ty in south China.Method]The abilities of different ecological floating beds to remove chemical oxygen demand(COD), total phosphorus(TP), total nitrogen(TN), ammonia nitrogen(NH4+-N) in landscape water were compared and analyzed. Meanwhile, the growth status of floating hydrophyte was compared and analyzed. Result]The results showed that, Can-na generalis, Iris tectorum and Arundo donax had good adaptability to water with high concentrations of organic matter , N and P, and had good abilities to remove COD, TP, TN, NH4+-N in water. The abilities of C. generalis+combined packing floating bed, C. generalis floating bed, combined packing floating bed to remove COD, TP, TN, NH4+-N in water were 33.75-48.98, 0.23-0.93, 3.71-10.26 and 4.12-8.44 mg/m2, respectively, with extremely significant difference(P<0.01). Three ecological floating beds were ordered based on their removal ability , as follows: C. generalis+combined packing floating bed>C. generalis floating bed>combined packing floating bed. Conclusion]C. generalis+combined packing floating bed has the best removal effect on COD, TP, TN and NH4+-N in water among three ecological floating beds, which is the first choice to restore ecological water environment in south China.