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首页> 外文会议>International Mine Water Association Congress >Limnology and Ecology of Low Sulphate, Poorly-buffered, Acidic Coal Pit Lakes in Collie, Western Australia
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Limnology and Ecology of Low Sulphate, Poorly-buffered, Acidic Coal Pit Lakes in Collie, Western Australia

机译：低硫酸盐，缓冲，苗酸性煤炭湖，西澳大利亚州湖的园学与生态学

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Coal mining in Collie (Western Australia) has produced pit lakes that range in area from <1 to 10 ha surface area, <10 to 70 m depth, 5-48 years in age water quality and the extent of remediation from none to extensive. Collie coal has low sulphur content and upon oxidation produces low amounts of acid mine drainage (AMD). However, low natural alkalinity in regional geologies produces pH as low as 3.5 in some pit lakes. Low pH is accompanied by low metal concentrations in pit lake waters, except for Al which is often at high concentrations and as very toxic species.Analysis of pit lake water quality data from 1995 to present has shown that in the absence of significant surface acidity inputs, acidity within the pit lakes slowly declines but without commensurate changes in pH. Increases in pH are only accompanied by inputs of circum-neutral groundwater or surface waters. Adits entering some pit lakes are thought to remain an important source of acidity. Experimental additions of organic matter direct the lakes on a different water quality evolution trajectory to neutral water inputs, highlighting that despite comparatively good water quality compared to many pit lakes worldwide, the lakes remain considerably different to their natural counterparts.
机译：牧羊犬（西澳大利亚州）的煤炭开采生产了坑湖，该坑湖泊的范围从<1到10 HA表面区域，<10至70米深度，5-48岁，年龄水质以及从无广泛的修复程度。 Collie Coam具有低硫含量，氧化产生少量的酸矿排水（AMD）。然而，区域地质中的低天然碱度在一些坑湖中产生低至3.5的pH。低pH伴随着坑湖水中的低金属浓度，除了往往是高浓度的al，均为高浓度和毒性物种。坑湖水质量数据分析于1995年至今的情况表明，在没有显着的表面酸度投入的情况下，坑内湖内的酸度慢慢下降，但没有相称的pH变化。 pH值增加仅伴随着环中性地下水或地表水的输入。进入一些坑湖的广告被认为是酸度的重要来源。有机物质的实验添加引导湖泊对不同的水质进化轨迹到中性水投入，突出显示尽管与全球许多坑湖相比，湖泊相比，湖泊仍然与其自然同行相比相当不同。

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