Sewage sludge used as agriculture fertilizers contains a conspicuous amount of potentially toxic metals. In order to prevent the contamination in the food chain, there is an urgent need for the development of sewage sludge clean up technology. The use of non-food, multi-harvest aromatic crops for phytoremediation of sewage sludge has many benefits. Besides the eco-friendly approach, plant biomass generated can be used to extract economically important essential oil free of heavy metals. Cymbopogon martinii was grown in soil (s) amended with different ratios of sewage sludge (ss), that is, 100s:0ss (control), 80s:20ss, 60s:40ss, 40s:60ss, 20s:80ss, and 0s:100ss. The experiment was conducted in a plastic sack under an open environment for 1 year and harvesting was done thrice. Plant growth and essential oil yield were significantly increased with the increasing dose of sewage sludge. Accumulation of toxic metal (Cd, Cr, Pb, Ni) and micronutrient (Fe, Zn, Cu, Mn) increased significantly in the shoot tissues confirmed by estimation of bioaccumulation and bioconcentration, and scanning electron microscopy and X-ray microanalyses. Soil enzyme activities were significantly improved with the plant growth period and increased doses of sludge. Results showed C. martinii acts as hyper-accumulator and thus could be used for phytoremediation of sewage sludge.

中文翻译：

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Cymbopogon martinii（Roxb。）Wats对污水污泥的植物修复。变种 Motia Burk。种植在土壤中的土壤经过不同程度的污水污泥修正。

用作农业肥料的污水污泥中含有大量的潜在有毒金属。为了防止食物链中的污染，迫切需要开发污泥净化技术。使用非食品，多收获的芳香作物进行污水污泥的植物修复具有许多好处。除了生态友好的方法外，所产生的植物生物量还可用于提取不含重金属的经济上重要的精油。Cymbopogon martinii在土壤中生长，并用不同比例的污水污泥（ss）进行改良，即100s：0ss（对照），80s：20ss，60s：40ss，40s：60ss，20s：80ss和0s：100ss 。实验是在开放环境下的塑料袋中进行1年，并收获三次。随着污水污泥剂量的增加，植物的生长和精油产量显着增加。通过对生物累积和生物浓度的估计以及扫描电子显微镜和X射线显微分析的确证，有毒金属（镉，铬，铅，镍）和微量营养素（铁，锌，铜，锰）的累积在芽组织中显着增加。随着植物的生长和污泥剂量的增加，土壤酶的活性显着提高。结果表明，马氏梭状芽胞杆菌可作为超富集剂，因此可用于污水污泥的植物修复。以及扫描电子显微镜和X射线显微分析。随着植物的生长和污泥剂量的增加，土壤酶的活性显着提高。结果表明，马氏梭状芽胞杆菌可作为超富集剂，因此可用于污水污泥的植物修复。以及扫描电子显微镜和X射线显微分析。随着植物的生长和污泥剂量的增加，土壤酶的活性显着提高。结果表明，马氏梭状芽胞杆菌可作为超富集剂，因此可用于污水污泥的植物修复。