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Effect of Fly Ash on Heavy Metals' Status in Soil and Water: Removal by Adsorption

机译：粉煤灰对土壤和水中重金属状况的影响：吸附去除

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Disposal of the increasing amounts of fly ash from coal-fired thermal power plants is a serious concern to the geo-environmentalists. The generated fly ash being disposed in ash ponds acts as source for heavy metal, which leads to soil and water contamination in the vicinity of power plants. In the present study, an attempt was made to measure heavy metal contamination of soil samples, surface water, and ground water around the Kakatiya Thermal Power Plant, Warangal. Soil samples from two locations and water samples from different water sources in the vicinity of thermal plant were analyzed for heavy metal contamination using microwave plasma-atomic emission spectroscopy. Results highlighted that the presence of heavy metal contamination in water samples found to be more than the permissible limits whereas in soil samples, no traces of heavy metals were found. The water drawn from selected sites was largely contaminated by lead (Pb) and mercury (Hg), whose permissible limits were above the WHO and BIS drinking water standards. It was also noted that high concentration of Pb was witnessed. Furthermore, adsorption studies were carried out to lower the concentration of observed metal ions within the drinking water standards. Biochar, a cost-effective material derived from agricultural waste, is used as an adsorbent in this study. Adsorption studies highlighted that the concentration of Pb was successfully brought within the drinking water standards whereas biochar was ineffective with Hg.
机译：处置燃煤热电厂中越来越多的粉煤灰是地球环境学家的严重关切。产生的粉煤灰被放置在烟灰池中，作为重金属的来源，导致发电厂附近的土壤和水受到污染。在本研究中，试图测量瓦朗加尔卡卡蒂亚热电厂周围土壤样品，地表水和地下水的重金属污染。使用微波等离子体原子发射光谱法分析了两个地点的土壤样品和热电厂附近不同水源的水样中的重金属污染。结果突出表明，水样品中存在的重金属污染超过了允许的限度，而在土壤样品中未发现任何重金属的痕迹。从选定的场所抽取的水主要被铅（Pb）和汞（Hg）污染，其允许的限值超过了WHO和BIS的饮用水标准。也有人指出，Pb的浓度很高。此外，进行吸附研究以降低饮用水标准中观察到的金属离子的浓度。生物炭，一种来自农业废物的经济有效的材料，在本研究中用作吸附剂。吸附研究表明，铅的浓度已成功地达到饮用水标准之内，而生物炭对汞无效。

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