较低温度下槐叶萍对富营养化水体中氮磷的去除效应研究

Study on Effects of Salvinia natans on Removing Nitrogen and Phosphors from the Eutrophic Water under Lower Temperature

[目的]考察槐叶萍在较低温度下对不同污染水平的地表水的氮磷去除效果及其生长情况。[方法]采用人工模拟废水试验,研究了较低温度条件下(16℃)利用固氮植物槐叶萍对模拟的3种磷浓度的地表水的氮磷去除效应。[结果]在3种磷浓度下,槐叶萍对地表水的铵态氮、硝态氮和可溶性磷均有较好的去除效果。在试验末期,在人工模拟的含0.1、0.41、.6 mg/L磷浓度的废水中,铵态氮去除率分别为(86.54±6.23)%(、91.04±7.12)%和(92.14±6.25)%;硝态氮去除率分别为(78.91±3.12)%(、78.84±6.21)%和(80.29±6.45)%;磷的去除率分别为(55.33±1.53)%(、72.08±3.71)%和(59.70±2.84)%。槐叶萍的生物量随水体中的磷浓度的增加而增加。[结论]槐叶萍可有效地去除富营养化地表水氮和磷,可选用作富营养化水体修复的植物。

[Objective] The study aimed to investigate the effects of Salvinia natans on removing nitrogen and phosphors in surface water with different pollution levels under lower temperature and its growth.[Method] In the test of artificial simulation of waste water,the effect of nitrogen fixing plant S.natans on removing the nitrogen and phosphorus from the simulated surface water with 3 kinds of phosphorus level under the low temperature（16 ℃）was studied.[Result] S.natans had a good effect of removing NH4＋-N,NO3——N,and P from water at 3 kinds of phosphorus level.At the end of experiment,in the waste water with P at 0.1,0.4,1.6 mg /L,the removal rates of NH4＋-N were（86.54 ± 6.23）%,（91.04 ± 7.12）% and（92.14 ± 6.25）% resp.;the removal rates of NO3——N were（78.91 ± 3.12）%,（78.84 ± 6.21）% and（80.29 ± 6.45）%,resp.;and the removal rates of P were（55.33 ± 1.53）%,（72.08 ± 3.71）% and（59.70 ± 2.84）%,resp..The biomass of S.natans was increased with increasing of P concn.in the water body.[Conclusion] S.natans co uld effectively remove the nitrogen and phosphors from the eutrophic surface water and could be selected as a good plant for remediation of eutrophic water.