Abstract This paper addresses the comparison of various low-cost organic materials for the passive treatment of circum-neutral pH contaminated mine water. First, the effectiveness of five organic materials to remove Ni from a contaminated neutral drainage (CND) was compared in short-term batch experiments (24 h) at various pH values. Second, based on results of the short-term experiments, two substrates (brown algae and sawdust) were eliminated and three (horticultural peat, compost, wood ash) were compared along with a new substrate (field-collected surface peat) in medium-term (56 days) batch experiments to treat CND. In these experiments, calcite was added to peat samples and all substrates performed equally well, sequestering over 97% of the Ni. Chemical extractions revealed that Ni was more strongly bound to the horticultural peat-calcite (HD-peat-calcite) residue than to the field-collected peat-calcite (LT-peat-calcite) residue. Compost, because of its higher density, was identified as the most promising candidate for sorption-based fixed-bed column experiments. Nevertheless, wood ash should not be discarded as its alkaline properties favor nickel removal.

中文翻译：

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用于被动处理镍污染的合成中性矿井排水的有机材料的比较：短期和中期批量实验

摘要 本文讨论了用于被动处理环中性 pH 值污染矿井水的各种低成本有机材料的比较。首先，在不同 pH 值的短期批量实验（24 小时）中比较了五种有机材料从受污染的中性排水系统 (CND) 中去除镍的有效性。其次，根据短期实验的结果，去除了两种基质（褐藻和锯末），并将三种基质（园艺泥炭、堆肥、木灰）与一种新基质（田间收集的表层泥炭）在培养基中进行了比较。治疗 CND 的期限（56 天）批量实验。在这些实验中，方解石被添加到泥炭样品中，所有底物的表现都一样好，螯合了 97% 以上的镍。化学提取表明，Ni 与园艺泥炭-方解石（HD-泥炭-方解石）残留物的结合比与现场采集的泥炭-方解石（LT-泥炭-方解石）残留物的结合更强。堆肥由于其密度较高，被认为是基于吸附的固定床柱实验最有希望的候选物。尽管如此，木灰不应被丢弃，因为它的碱性有利于去除镍。