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首页> 外文期刊>Plant and Soil >Using municipal biosolids in combination with other residuals to restore metal-contaminated mining areas
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Using municipal biosolids in combination with other residuals to restore metal-contaminated mining areas

机译：将市政生物固体与其他残留物结合使用，以恢复被金属污染的矿区

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High metal waste materials from historic mining at the Bunker Hill, Idaho (ID) Superfund site was amended with a range of materials including municipal biosolids, woody debris, wood ash, pulp and paper sludge, and compost. The existing soil or waste material has elevated metal concentrations with total Zn, Pb and Cd ranging from 6000 to 14 700, 2100 to 27 000 and 9 to 28 mg kg−1, respectively. Surface application of certain amendments including biosolids mixed with wood ash resulted in significant decreases in subsoil acidity as well as subsoil extractable metals. This mixture was sufficient to restore a plant cover to the contaminated areas. At the Bunker Hill site, a surface application of high N biosolids (44 or 66 tons ha−1) in combination with wood ash (220 tons ha−1) with or without log yard debris (20% by volume) or pulp and paper sludge (44 tons ha−1) was able to restore a vegetative cover to the metal contaminated materials for 2 years following amendment application. Plant biomass in 1999 was 0.01 mg ha−1 in the control versus a mean of 3.4 tons ha−1 in the residual amended plots. Metal concentrations of the vegetation indicated that plants were within normal concentrations for the 2 years that data were collected. Surface application of amendments was also able to reduce Ca(NO3)2 extractable Zn in the subsoil from about 50 mg kg−1in the control to less than 4 mg kg−1in two of the treatments. Use of conventional amendments including lime alone and microbial stimulants were not sufficient to support plant growth. These results indicate that surface application of biosolids in combination with other residuals is sufficient to restore a vegetative cover to high metal mine wastes.
机译：爱达荷州爱达荷州邦克山市历史悠久的采矿所产生的高金属废料已经过修改，其中包括市政生物固体，木屑，木灰，纸浆和造纸污泥以及堆肥等多种材料。现有的土壤或废料中的金属浓度较高，锌，铅和镉的总含量分别为6000至14700、2100至27000和9至28 mg kg-1 。表面改性剂的表面应用，包括将生物固体与木灰混合，会显着降低土壤的酸度以及土壤的可提取金属。这种混合物足以使植物覆盖到受污染的地区。在邦克山（Bunker Hill）场地，将高氮生物固体（44或66吨ha-1 ）与木灰（220吨ha-1 ）结合使用，不论是否带有木料场碎屑（20）修改后的两年内，纸浆和纸浆污泥（44吨ha-1 ）能够恢复被金属污染的材料的植被。对照中，1999年的植物生物量为0.01 mg ha-1 ，而剩余的修正地块平均为3.4吨ha-1 。植被中的金属浓度表明，在收集数据的两年中，植物均处于正常浓度范围内。表面应用改性剂还能够将土壤中Ca（NO3 ）2 的可提取锌从对照中的约50 mg kg-1 降低至小于4 mg kg-1 < / sup>中的两种治疗方法。仅使用石灰和微生物刺激剂等常规改良剂不足以支持植物生长。这些结果表明，将生物固体与其他残留物结合使用，足以恢复高金属矿山废物的植被。

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