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首页> 外文期刊>Indian Geotechnical Journal >Dewatering and Utilization of Fly Ash Slurries Using Geotextile Tubes
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Dewatering and Utilization of Fly Ash Slurries Using Geotextile Tubes

机译：土工布管对粉煤灰泥浆的脱水利用

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About one billion metric tons of coal ashes are produced annually around the world, among which 700 million tons are fly ash wastes that must be disposed of. The practice of wet fly ash disposal has increased envi- ronmental concerns due to fly ash leachate, ground water contamination, and the limitation of pond capacity. Therefore, alternatives to the current disposal methods should be addressed. Geotextile tube dewatering is an efficient dewatering method that can decrease the volume of fly ash slurry and at the same time provides containment of dry fly ash. In this study, pressure filtration tests were conducted to evaluate the dewatering performance of Class C fly ash with seven woven geotextiles having a wide range of hydraulic properties. Anionic polymer flocculant was used to evaluate the effect of polymer conditioning on dewatering performance. In addition, the increase in filter cake strength due to flocculants was evaluated. Lastly, chemical analysis of the effluent was performed to quantify the concentration of contaminants present in the geotex- tile tube effluent. The results of this study indicate that hydraulic properties of the geotextile do not have a sig- nificant effect on the dewatering performance of fly ash. It was found that polymer conditioning significantly increased the strength of the filter cake, making fly ash filled geotextile tubes suitable for use in geotechnical engineering applications. It was also found that geotextile tube dewatering does not retain fly ash trace elements that can leach out with effluent, meaning that proper safety measures must be taken in fly ash reutilization projects.
机译：全世界每年生产约十亿吨煤灰，其中有七亿吨是必须处理的粉煤灰废物。由于粉煤灰的渗滤液，地下水的污染以及池塘容量的限制，湿式粉煤灰的处理引起了更多的环境关注。因此，应解决当前处置方法的替代方案。土工布管脱水是一种有效的脱水方法，可以减少粉煤灰浆的体积，同时提供干粉煤灰的控制。在这项研究中，进行了压力过滤测试，以评估C级粉煤灰与七种具有广泛水硬性的机织土工织物的脱水性能。阴离子聚合物絮凝剂用于评估聚合物调理对脱水性能的影响。另外，评价了由于絮凝剂引起的滤饼强度的增加。最后，对废水进行化学分析以量化存在于地砖管废水中的污染物浓度。这项研究的结果表明，土工布的水力特性对粉煤灰的脱水性能没有显着影响。发现聚合物调节显着增加了滤饼的强度，使得粉煤灰填充的土工织物管适用于岩土工程应用。还发现土工布管的脱水没有保留会随废水浸出的飞灰痕量元素，这意味着在飞灰再利用项目中必须采取适当的安全措施。

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