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广州李坑拉圾卫生填埋场的渗滤污水含有高浓度的污染物，经过人工净化后仍未达到排放标准，对植物产生毒害。在被观测的４种植物中，水葫芦（Ｅｉｃｈｈｏｒｎｉａｃｒａｓｉｐｅｓ）在高浓度和低浓度２种污水中均被毒害致死；百喜草（Ｐａｓｐａｌｕｍｎｏｔａｔｕｍ）在高浓度的渗滤液中不能存活，在低浓度中受严重伤害；水花生（Ａｌｔｅｒｎａｎｔｈｅｒａｐｈｉｌｏｘｅｒｏｉｄｅｓ）在高浓度污水中受较重伤害，但在低浓度形成庞大生物体，这可能是污水的“富营养化”所致；香根草（Ｖｅｔｉｖｅｒｉａｚｉｚａｎｉｏｉｄｅｓ）在这２种污水中亦受伤害，但受害程度为４种植物中最轻。在污水中表现相对较好的２种植物中，水花生对低浓度污水的净化效果总体上好于香根草，尤其对总氮和硝态氮的净化效果明显好于香根草，但香根草对高浓度污水中的７种“污物”的净化效果均优于水花生，且对低浓度污水中的磷与ＣＯＤ的净化亦优于水花生。在被观测的７种水质指标中，植物对氨态氮的净化效果最好，净化率在７７％～９１％之间。此外，香根草对磷也表现出了较强的净化能力，净化率高达７０％以上。香根草和水花生可分别作为高、低２种浓度垃圾污水的净化植物来辅助净化污水。
The leachate in Guangzhou Likeng refuse sanitation landfill contains high concentrations of pollutants, which have not yet reached the emission standards after being artificially purified and have toxic effects on plants. Among the four plants observed, water hyacinth (Eichhorniacrasipes) was poisoned to death in both high and low concentrations of sewage. Paspalumnotatum could not survive in high concentrations of leachate, but at low concentrations Severe injury; Alternantheraphiloxeroides were seriously injured in high concentration of sewage, but formed a large organism at low concentration, which may be caused by sewage “eutrophication”; vetiver grass (Vetiveriazizanioides) in these two Sewage was also harmed, but the damage was the lightest of the four plants. Among the two plants that showed relatively good performance in sewage, the decontamination effect of water peanut on low-concentration sewage was generally better than that on vetiver. In particular, the purification effect of total nitrogen and nitrate nitrogen was better than that of vetiver, Roots grass on the high concentrations of sewage in the seven kinds of “dirt” purification effect is better than water peanuts, and low concentrations of sewage phosphorus and COD purification is also better than water peanuts. Among the seven indicators of water quality observed, plants had the best purification effect on ammonia nitrogen, and the purification rate was between 77% and 91%. In addition, vetiver phosphorus also showed a strong purification capacity, purification rate as high as 70%. Vetiver and peanut can be used as high and low concentrations of waste water purification plants to assist the purification of sewage.