Man-Technology-Environment Research Centre, Örebro University, 701 82, Örebro, Sweden,
Environ Sci Pollut Res Int. 2014;21(11):6888-904. doi: 10.1007/s11356-014-2600-x. Epub 2014 Feb 13.
Contamination of the environment due to mining and mineral processing is an urgent problem worldwide. It is often desirable to establish a grass cover on old mine waste since it significantly decreases the production of leachates. To obtain sustainable growth, it is often necessary to improve several properties of the waste such as water-holding capacity, nutrient status, and toxicity. This can be done by addition of organic materials such as wood residues, e.g., compost. In this study, we focus on the solution chemistry of the leachates when a substrate containing historic sulfidic mine waste mixed with 30 % (volume) bark compost is overgrown by Agrostis capillaris. The pot experiments also included other growth-promoting additives (alkaline material, mycorrhiza, and metabolizable carbon) to examine whether a more sustainable growth could be obtained. Significant changes in the plant growth and in the leachates composition were observed during 8 weeks of growth. It was concluded that in this time span, the growth of A. capillaris did not affect the composition of the leachates from the pots. Instead, the composition of the leachates was determined by interactions between the bark compost and the mine waste. Best growth of A. capillaris was obtained when alkaline material and mycorrhiza or metabolizable carbon was added to the substrate.
由于采矿和矿物加工导致的环境污染是一个全球性的紧迫问题。在旧的矿山废料上建立草皮覆盖通常是可取的，因为它可以显著减少浸出液的产生。为了获得可持续的生长，通常需要改善废物的几个特性，如持水能力、养分状况和毒性。这可以通过添加有机材料来实现，例如木屑，如堆肥。在这项研究中，我们关注的是当含有历史硫化矿山废物的基质与 30%（体积）树皮堆肥混合，并被 Agrostis capillaris 覆盖时，浸出液的溶液化学。盆栽实验还包括其他促进生长的添加剂（碱性物质、菌根和可代谢碳），以检验是否可以获得更可持续的生长。在 8 周的生长过程中，观察到植物生长和浸出液组成的显著变化。结论是，在这段时间内，A. capillaris 的生长并没有影响来自盆栽的浸出液的组成。相反，浸出液的组成是由树皮堆肥和矿山废物之间的相互作用决定的。当碱性物质和菌根或可代谢碳添加到基质中时，A. capillaris 获得了最佳的生长。
