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首页> 外文期刊>Environmental Science & Technology >Macrocosm Studies for Neutralization of Hypolimsiic Acid Mine Pit Lake Water (pH 2.6)
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Macrocosm Studies for Neutralization of Hypolimsiic Acid Mine Pit Lake Water (pH 2.6)

机译：中和低聚次硫酸盐矿坑湖水（pH 2.6）的宏观研究

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摘要

Ten microcosms of 0.088 m{sup}3water volume (0.3 m i.d. and 1.20 m height) were designed for neutralization studies representing hypolimnic ecosystem models for acid mine pit lakes. Sediment and water were collected from an acid lignite mine pit lake (Brandenburg, Germany) and filled into the microcosms. To determine the efficacy of controlled in situ organic carbon amendments as a possible neutralization method, sediment and water were treated with ethanol and Carbokalk with and without wheat straw. The water chemistry was monitored for 1 yr. At start-up and end of the experiments, the sedimentwas characterized. Iron and sulfate were removed with varying intensity from the water phase as a result of microbial iron and sulfate reduction together with a subsequent precipitation of unsoluble sulfide minerals to the sediment. The pH rose, and alkalinity generation and bacterial growth were observed. Neutralization rates were calculated using equivalents of accumulated total reduced inorganic sulfur together with the nonsulfidic reactive ferrous iron in the sediment. In the treated microcosms, the neutralization rates were between 6 and 15 equiv m{sup}(-2)a{sup}(-1). Carbokalk was most effective in stimulating growth of sulfate-reducing bacteria and probably also served as inoculum. With Carbokalk together with wheat straw, the pH increased from 2.6 to around 6.5 within the whole microcosm. The critical revision of the results indicates that the application of Carbokalk (approximately 3.9 kg m{sup}(-2)) together with the application of wheat straw (approximately 9.3 kg m{sup}(-2)) is most suitable for further experiments in outdoor enclosures (mesocosms). For that case, the prediction of the water quality for a lake water column after multiple lake turnover events is presented based on batch reaction simulation using the geochemical model PHREEQC.
机译：为中和研究设计了10个0.088 m {sup} 3水量的缩影（内径为0.3 m，高度为1.20 m），代表了酸性矿坑湖的次生生态系统模型。从酸性褐煤矿坑湖（德国勃兰登堡）收集沉积物和水，并将其填充到微观世界中。为了确定可控制的原位有机碳改良剂作为一种可能的中和方法的功效，将沉淀物和水分别用乙醇和Carbokalk（有或没有麦秸）处理。监测水化学反应1年。在实验的开始和结束时，对沉积物进行了表征。由于微生物中铁和硫酸盐的还原以及随后不溶性硫化物矿物向沉淀物中的沉淀，铁和硫酸盐以不同的强度从水相中去除。 pH上升，并且观察到碱度的产生和细菌的生长。中和速率是使用沉积物中累积的总还原无机硫和非硫化活性亚铁的当量计算得出的。在处理过的微观世界中，中和率在6至15当量m {sup}（-2）a {sup}（-1）之间。 Carbokalk对刺激减少硫酸盐的细菌的生长最有效，并且可能还可以作为接种物。在整个缩影中，将Carbokalk与麦秸一起使用，pH值从2.6增加到6.5。对结果的严格修改表明，Carbokalk（约3.9 kg m {sup}（-2））的应用与麦秸（约9.3 kg m {sup}（-2））的应用最适合在室外环境中进行实验（宇宙）。对于这种情况，基于使用地球化学模型PHREEQC的间歇反应模拟，提出了在多次湖水周转事件之后对湖水柱水质的预测。

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