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首页> 外文期刊>Canadian Geotechnical Journal >Diffusion of oxygen through a pulp and paper residue barrier
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Diffusion of oxygen through a pulp and paper residue barrier

机译：氧气通过纸浆和纸张残留物屏障的扩散

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Acid mine drainage can be curbed or reduced significantly by covering tailings sites with an oxygen barrier. In this study, the ability of pulp and paper residues, more specifically deinking residues, to function as such a barrier was investigated. Field data from two sites show that O-2 diffusion through the barriers can be greatly reduced. To better understand how oxygen migrates through deinking residues and to develop prediction tools for future design with deinking residues, one-dimensional effective diffusion coefficients (D-e) were determined by fitting laboratory experimental curves (O-2 concentration versus time data) to curves obtained from computer simulations. The results obtained confirmed the behaviour observed in soil covers: the effective diffusion coefficients are highly dependent on the degree of saturation (Sr) of the compacted material. The D-e values obtained in this study compare well with those published in the literature for several materials compacted at similar Sr. The D-e values varied from 8.3 x 10(-9) m(2)/s (Sr approximate to 91%) to 9.7 x 10(-7) m(2)/s (Sr approximate to 76%). The O-2 consumption by biodegradation appears to be an important factor in the reduction of the O-2 flux that can reach the bottom of the barrier. [References: 43]
机译：酸性矿山的排水可以通过用氧气阻隔层覆盖尾矿部位来显着抑制或减少。在这项研究中，研究了纸浆和纸张残留物（更具体地说是脱墨残留物）作为此类屏障的功能。来自两个地点的现场数据表明，O-2通过屏障的扩散可以大大减少。为了更好地了解氧气如何通过脱墨残留物迁移并开发用于脱墨残留物未来设计的预测工具，通过将实验室实验曲线（O-2浓度与时间数据）拟合为从中获得的曲线来确定一维有效扩散系数（De）计算机模拟。获得的结果证实了在土壤覆盖层中观察到的行为：有效扩散系数高度取决于压实材料的饱和度（Sr）。在这项研究中获得的De值与以相似的Sr压实的几种材料的文献中所公布的De值相当好，De值从8.3 x 10（-9）m（2）/ s（Sr约为91％）变化到9.7 x 10（-7）m（2）/ s（Sr约为76％）。通过生物降解消耗的O-2似乎是减少可以到达屏障底部的O-2通量的重要因素。 [参考：43]

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