不同植物篱系统对坡耕地农田径流污染物的去除效果

发布时间：2018-04-24 12:58

本文选题：植物篱 + 坡耕地农田废水　；参考：《农业环境科学学报》2016年06期

【摘要】：采用人工模拟实验,探讨了四种植物篱系统在不同坡度(5°、10°和20°)、不同污染物进水浓度(低、中、高)下对坡耕地农田径流污染物TN、TP、NH_3-N、TOC、COD的去除效果。植物篱系统分别是红叶石楠+小叶女贞+黑麦草(T1)、红叶石楠+小叶女贞(T2)、小叶女贞+黑麦草(T3)、红叶石楠+黑麦草(T4)。结果表明:植物篱系统对污染物的去除率均随坡度的增加而下降,TP、NH_3-N、COD尤为明显,当坡度由5°增加到20°时,TP的去除率由52.25%~76.75%降至33.68%~60.34%,NH_3-N的去除率由36.84%~68.33%降至34.30%~45.46%,COD的去除率由13.26%~38.69%降至3.15%~26.74%。除NH_3-N外,随污染物进水浓度的升高,植物篱对污染物的去除效果越明显,TP的去除率可由33.33%~60.11%升至57.06%~81.44%,TOC的去除率可由-0.84%~2.92%升至9.64%~17.69%,COD的去除率可由-14.75%~11.25%升至20.62%~42.33%。植物篱系统对TN、TP、NH_3-N、TOC、COD的去除效果显著优于裸土(对照系统),在不同坡度下去除率最高分别能由12.81%升至47.02%、34.29%升至76.75%、18.27%升至68.33%、-0.93%升至11.52%、2.31%升至38.69%,在不同污染物进水浓度下分别能由15.57%升至53.05%、37.93%升至81.44%、17.60%升至64.05%、2.92%升至17.69%、-33.40%升至11.25%。总体而言,植物篱系统平均去除效果依次为T1T4T3T2,即红叶石楠+小叶女贞+黑麦草去除效果最佳,这与三种植物的地表覆盖率高、根系发达以及在功能上相互取长补短、协同固定污染物有关。
[Abstract]:In this paper, the effects of four hedgerow systems on the removal of TNTP-NH3-NTOCU COD in sloping farmland runoff under different gradient of 5 掳~ (10 掳) and 20 掳~ (-1) and different influent concentration (low, medium and high) were studied by artificial simulation experiment. The hedgerow system is T1, T2, T3 and T4, respectively. The results showed that the removal rate of the pollutants in hedgerow system decreased with the increase of slope, and the removal rate of TP decreased from 52.25 ~ 76.75% to 33.68 ~ 60.34% from 36.84 ~ 68.33% to 34.30% ~ 45.46 ~ (6)% from 13.2626 ~ 38.69% to 3.15 ~ (26.74)% when the slope increased from 5 掳to 20 掳. With the increase of influent concentration of pollutants, the removal rate of TP in hedgerow increased from 33.33 ~ 60.11% to 57.06% and 81.44% respectively. The removal rate of TP increased from -0.844% to 9.64 ~ 17.69% from -14.75% to 20.62% and 42.33% from -14.75% to 20.62%, respectively. The removal of COD by hedgerow system was significantly better than that of bare soil (control system), the highest removal rate of COD was increased from 12.81% to 47.02% at different slopes, respectively, and from 18.27% to 68.33% to 11.522.31% to 38.6991% under different influent concentrations of pollutants, respectively, in the hedgerow system, the removal rate of COD was significantly higher than that of the bare soil (control system). The highest removal rate was increased from 12.81% to 47.02% at different slopes, and from 18.27% to 68.332.31% to 11.522.31% at different influent concentrations of pollutants, respectively. 15.57% rose to 53.05% and 37.93% to 81.440.17.60% to 64.052.92% to 17.69% -33.40% to 11.25%. In general, the average removal efficiency of hedgerow system was T1T4T3T2, that is, the best removal effect of Lolium lucidum L., which was the best, compared with the three plants with high surface coverage, well developed root system and complementary function. Synergistic fixation of pollutants.
【作者单位】：四川农业大学环境学院;
【基金】：四川省青年科技创新团队项目(2014TD0019)
【分类号】：X712;X173

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