Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Total Environ. 2023 Jul 1;880:163246. doi: 10.1016/j.scitotenv.2023.163246. Epub 2023 Apr 4.
Organic waste comprises a large amount of hydrocarbon containing organic substances, which is regarded as a potential resource rather than simply a waste. A field experiment was conducted in a poly-metallic mining area to investigate the potential of organic waste to facilitate the soil remediation process. Different organic wastes and a commonly used commercial fertilizer were added to heavy metal contaminated soil, which was under phytoremediation using the As hyperaccumulator Pteris vittata. The influence of diverse fertilizer regimes on the biomass of P. vittata and heavy metal removal by P. vittata, was investigated. The soil properties were analyzed after the application of phytoremediation with or without the addition of organic wastes. Results indicated that sewage sludge compost is an appropriate amendment to improve the phytoremediation efficiency. Compared to the control, the application of sewage sludge compost significantly reduced the extractability of As in soil by 26.8 %, and increased the removal of As and Pb by 26.9 % and 186.5 %, respectively. The highest removal of As and Pb reached 33 and 34 kg/ha, respectively. The sewage sludge compost-strengthened phytoremediation improved soil quality. And the diversity and richness of the bacterial community were improved, as represented by the increase in Shannon and Chao index. With improved efficiency and acceptable cost, the organic waste-strengthened phytoremediation can be used to control the risks posed by high concentrations of heavy metals in mining areas.
有机废物包含大量含碳有机物质，被视为一种潜在的资源，而不仅仅是废物。在一个多金属矿区进行了一项田间试验，以研究有机废物促进土壤修复过程的潜力。在蜈蚣草（As 超积累植物）进行植物修复的同时，向重金属污染土壤中添加了不同的有机废物和一种常用的商业肥料。研究了不同肥料制度对蜈蚣草生物量和蜈蚣草去除重金属的影响。在进行或不进行有机废物添加的植物修复后，分析了土壤性质。结果表明，污水污泥堆肥是提高植物修复效率的合适改良剂。与对照相比，污水污泥堆肥的应用可使土壤中 As 的提取率降低 26.8%，并使 As 和 Pb 的去除率分别提高 26.9%和 186.5%。As 和 Pb 的最高去除率分别达到 33 和 34 kg/ha。污水污泥堆肥强化的植物修复改善了土壤质量。细菌群落的多样性和丰富度也得到了提高，Shannon 和 Chao 指数增加。通过提高效率和可接受的成本，有机废物强化的植物修复可以用来控制矿区高浓度重金属带来的风险。
