Leaching characteristics of alkaline coal combustion by-products: A case study from a coal-fired power plant, Hebei Province, China
Leaching characteristics of alkaline coal combustion by-products: A case study from a coal-fired power plant, Hebei Province, China
复制标题
碱性煤燃烧副产物的浸出特性：以中国河北省某燃煤电厂为例
DOI：
10.1016/j.fuel.2019.115710
复制
发表时间：
2019-11
期刊：
影响因子：
7.4
通讯作者：
Li Xuewen
中科院分区：
文献类型：
--
作者：
Zhang Siyu;Dai Shifeng;Finkelman Robert B;Graham Ian T;French David;Hower James C;Li Xuewen
近年来，煤炭燃烧副产物因其产量大、潜在有毒元素对环境的不利影响以及作为关键金属的潜在来源而备受关注。为了更好地评价碱性煤燃烧副产物的浸出特性，本研究采用了美国环境保护局提出的浸出环境评估框架（LEAF）。根据样品的性质，本文主要采用的测试方法有方法1313、1314和1316。根据化学分析结果，绘制了样品的液固分配曲线。样本采集自中国河北省孙庄燃煤电厂。从pH值、液固比和累积液固比三个方面探讨了煤燃烧副产物的浸出特性。根据液固分配曲线的变化趋势，讨论了煤燃烧副产物中微量元素的赋存方式和迁移原因。为了评估燃煤副产物中有害元素的潜在环境风险，将危险元素的最大浸出值与中国地下水ⅲ类水质标准的上限值进行了比较，结果表明，1313方法中粉煤灰和底灰的淋洗液中砷、硒、铍、铊、镍和铅的含量均超过了建议上限。然而，在方法1314和1316的洗脱液中，硒、钼、钡和镍超过了推荐的上限。
In recent years, coal combustion by-products have attracted much attention because of their large production volume, adverse environmental effects of potentially toxic elements, and as potential sources of critical metals. In order to better evaluate the leaching characteristics of alkaline coal combustion by-products, the Leaching Environment Assessment Framework (LEAF) proposed by the United States Environmental Protection Agency was adopted in this study. Depending upon the properties of the samples, the test methods used in this paper mainly included Methods 1313, 1314, and 1316. The liquid-solid partitioning curves of samples were drawn according to the results of chemical analysis. Samples were collected from the coal-fired Sunzhuang Power Plant, Hebei Province, China. The leaching characteristics of coal combustion by-products are discussed from three aspects: pH values, liquid--solid ratios, and accumulated liquid-solid ratios. According to the trend of the liquid-solid partitioning curves, the modes of occurrence and causes of mobility of trace elements in the coal combustion by-products are discussed. To assess the potential environmental risk of hazardous elements leached from coal combustion by-products, the maximum leaching values of hazardous elements were compared to the upper limit value of the Type III Chinese groundwater quality standard, suggesting that in the eluates of Method 1313, arsenic, selenium, beryllium, thallium, nickel, and lead contents in the eluates of fly ash and bottom ash exceed the recommended upper limit. However, in the eluates of Methods 1314 and 1316, selenium, molybdenum, barium, and nickel exceed the recommended upper limit.
登录
查看更多内容
影响因子：
5.6
作者：
N. Wagner;A. Matiane
通讯作者：
N. Wagner;A. Matiane
DOI：
10.1016/s1003-6326(16)64112-2
发表时间：
2016-01-01
影响因子：
4.5
作者：
Poykio, Risto;Makela, Mikko;Dahl, Olli
通讯作者：
Dahl, Olli
影响因子：
7.4
作者：
Hassett, DJ;Pflughoeft-Hassett, DF;Heebink, LV
通讯作者：
Heebink, LV
影响因子：
5.6
作者：
Kevin B. Jones;L. Ruppert;S. M. Swanson
通讯作者：
Kevin B. Jones;L. Ruppert;S. M. Swanson
影响因子：
3.9
作者：
Dai, Shifeng;Wang, Xibo;Zou, Jianhua
通讯作者：
Zou, Jianhua