• 关键词：

• 基金项目：

• 朱法华

• 张景荣

• 荣鸿敏

• 张文华

• 摘要：我国火电厂粉煤灰,全部为碱性灰,在自然淋溶条件下,淋出液中绝大多数重金属的含量一般较低,但是,pH值、SO₄^2-、F^-和Cr⁶⁺等项目经常超过生活饮用水卫生标准(GB5749-85),pH值、F^-等项目甚至经常超过污水综合排放标准(GB8978-88)新扩改一级,是粉煤灰中的主要污染因子。粉煤灰中不同污染因子受淋溶介质的影响不同,酸性介质有利于Ca²⁺,F^-的释放,碱性介质有利于Cr⁶⁺的释放,在各种介质淋溶下,主要污染因子的淋溶释放一般符合C_t=G₀^ebint模型。通过模型不仅可了解污染因子的释放能力及释放速度,而且可为灰场是否需要进行工程处理提供依据。此外,还可用于灰场对水环境污染的源强预测。

• Abstract：All fly ash of power station is alkaline in China. Concentrations of most heavy metals in leachate solution is generally lower under natural leaching conditions. Nevertheless, pH, SO₄^2-, F^- and Cr⁶⁺ often exceed hygiene standard on drinking water (GB5749-85). Moreover, pH and F-often exceed comprehensive drainage standard on waste water (GB8978-88) .Ca²⁺ and F^- in ash are readily released in acid medium. Cr⁶⁺ is readily released in alkaline medium. The leachation of main pollutants generally follow following equation under all kinds of conditions: Ct =C₀e^blnt. Mobility and release speed of pollutant can be predicted by the equation. suggestion on whether of not the ash pond needs special antiseep layer can be provided by the model.

• Key words：

• 
  摘要点击次数： 1488 全文下载次数： 3739