几种植物去除污染水体中养分效果研究

Removal Efficiency of Nutrients from Wastewater by Several Plants

对城市尾水和人工模拟富营养化水体进行了静态培养试验。通过比较不同植物对城市尾水中氮、磷去除效果,以及它们在不同磷浓度条件下对不同形态氮素去除效果研究,目的在于筛选出适合治理富养分污染水体的植物品种。研究结果表明,空心菜(Ipomiea aquatica)、酸模(Rumex acetosa)、莎草(Cyperusglomeratus)3种植物都能很好地吸收尾水中的营养物质,且生长状况良好。经3种植物处理的城市尾水,其氮、磷浓度随水培时间的增加而降低。莎草、酸模对污水中TN的去除率达90%以上,其中莎草最高,达93.4%;空心菜对全磷的去除率最高达76.9%。NH4+-N在处理前期变化显著,且莎草的净化效果最好达94.4%;污水中NO3--N含量随着水培时间的增加而逐渐下降,但在试验后期NO3--N又有所增加。酸模去除NO3--N效果最好,达65.4%。另外3种植物对NH4+-N和NO3--N都具有一定的吸收作用,并且优先吸收NH4+-N。且从对于NH4+-N和NO3--N净化效果看,莎草>酸模>空心菜。

The study method used is the one investigating the effluent from activated sludge treatment and artificial wastewater in two experiments.The first experiment examined the nitrogen and phosphorus removal efficiency of effluent from activated sludge treatment by several plants.The second experiment explored the removed efficiency of different forms of nitrogen with different concentrations of phosphorus in the artificial wastewater.The aim of the study was to filter out the proper plant varieties for eutrophi...