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首页> 美国卫生研究院文献>other >Compacted Sewage Sludge as a Barrier for Tailings: The Heavy Metal Speciation and Total Organic Carbon Content in the Compacted Sludge Specimen
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Compacted Sewage Sludge as a Barrier for Tailings: The Heavy Metal Speciation and Total Organic Carbon Content in the Compacted Sludge Specimen

机译：压缩污泥作为尾矿的屏障：压缩污泥样品中的重金属形态和总有机碳含量

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摘要

Acid mine drainage (AMD) was the main environmental problem facing the mining industry. For AMD had high heavy metals content and low pH, the compacted sewage sludge might be a barrier for tailings whose oxidation and weathering produced AMD, with its own carbon source, microorganism reduction ability and impermeability. To study the heavy metals environmental risk, under the simulate AMD, the deionized water (DW), and the pH 2.1 sulfuric acid water (SA) seepage conditions, respectively, the changes of the chemical speciation of heavy metals Cd, Cu, Fe, Ni, Zn and total organic carbon (TOC) content in the compacted sewage sludge were assessed in the different periods. The results indicated according to the distribution of heavy metals, the potential mobility was for Cd: 6.08 under AMD, 7.48 under SA, ∞ under DW; for Cu: 0.08 under AMD, 0.17 under SA, 0.59 under DW; for Fe: 0.15 under AMD, 0.22 under SA, 0.22 under DW; for Ni: 2.60 under AMD, 1.69 under SA, 1.67 under DW; and for Zn: 0.15 under AMD, 0.23 under SA and 0.21 under DW at the second checking time. TOC content firstly decreased from 67.62±0% to 66.29±0.35%, then increased to 67.74±0.65% under the AMD seepage while TOC decreased to 63.30±0.53%, then to 61.33±0.37% under the DW seepage, decreased to 63.86±0.41%, then to 63.28±0.49% under SA seepage. That indicated under the AMD seepage, the suitable microorganisms communities in the compacted sewage sludge were activated. And the heavy metals environmental risk of compacted sewage sludge was lower with AMD condition than with other two. So the compacted sewage sludge as a barrier for tailings was feasible as the aspect of environmental risk assessment.
机译：酸性矿山排水（AMD）是采矿业面临的主要环境问题。由于AMD重金属含量高且pH值低，因此压实的污水污泥可能成为尾矿的障碍，因为尾矿的氧化和风化产生了AMD，因为它具有自身的碳源，微生物还原能力和不渗透性。为了研究重金属的环境风险，分别在模拟AMD，去离子水（DW）和pH 2.1硫酸水（SA）渗透条件下，重金属Cd，Cu，Fe，在不同时期评估压实污水污泥中的镍，锌和总有机碳（TOC）含量。结果表明，根据重金属的分布，Cd的潜在迁移率为：AMD下为6.08，SA下为7.48，DW下为∞。对于Cu：在AMD下为0.08，在SA下为0.17，在DW下为0.59；对于Fe：在AMD下为0.15，在SA下为0.22，在DW下为0.22； Ni：在AMD下为2.60，在SA下为1.69，在DW下为1.67； Zn：在第二次检查时，AMD下为0.15，SA下为0.23，DW下为0.21。 TOC含量首先从67.62±0％下降至66.29±0.35％，然后在AMD渗漏下增加至67.74±0.65％，而TOC下降至63.30±0.53％，然后在DW渗漏下降至61.33±0.37％，下降至63.86± 0.41％，然后在SA渗漏下达到63.28±0.49％。在AMD渗漏表明，压实的污水污泥中合适的微生物群落被激活。在AMD条件下，压实污泥的重金属环境风险要比其他两种情况低。因此，将压实的污泥作为尾矿的屏障作为环境风险评估的一个方面是可行的。

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