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Hydrobiogeochemical interactions in `anoxic' limestone drains for neutralization of acidic mine drainaae

机译：在“缺氧”石灰石排水沟中进行中性酸性矿山排水的水生地球化学相互作用

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Processes affecting neutralization of acidic coal mine drainage were evaluated within `anoxic' limestone drains (ALDs). Influents had pH ≤ 3.5 and dissolved oxygen < 2 mg/l. Even though effluents were near neutral (pH > 6 and alkalinity > acidity), two of the four ALDs were failing due to clogging. Mineral-saturation indices indicated the potential for dissolution of calcite and gypsum, and precipitation of Al~(3+) and Fe~(3+) compounds. Cleavage mounts of calcite and gypsum that were suspended within the ALDs and later examined microscopically showed dissolution features despite coatings by numerous bacteria, biofilms, and Fe-Al-Si precipitates. In the drain exhibiting the greatest flow reduction, Al-hydroxysulfates had accumulated on limestone surfaces and calcite etch points, thus causing the decline in transmissiviiy and dissolution. Therefore, where Al loadings are high and flow rates are low, a pre-treatment step is indicated to promote Al removal before diverting acidic mine water into alkalinity-producing materials.
机译：在“缺氧”石灰石排水管（ALD）中评估了影响酸性煤矿排水中和的过程。进水的pH≤3.5，溶解氧<2 mg / l。即使污水接近中性（pH> 6，碱度>酸度），四个ALD中的两个也由于堵塞而失效。矿物饱和指数表明方解石和石膏有溶解的可能性，并且Al〜（3+）和Fe〜（3+）化合物有沉淀的可能。方解石和石膏的裂解物悬浮在ALDs中，随后进行了显微镜检查，尽管有许多细菌，生物膜和Fe-Al-Si沉淀物覆盖，但仍显示出溶解特征。在显示出最大流量减少的排水管中，羟基硫酸铝积聚在石灰石表面和方解石蚀刻点上，从而导致透射率和溶解度下降。因此，在铝负荷高而流速低的地方，需要进行预处理步骤以促进铝的去除，然后再将酸性矿井水转移到产生碱的材料中。

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