State Key Lab of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Shenhua Guohua (Beijing) Electric Power Research Institute Co. Ltd., Beijing 100018, China.
State Key Lab of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
J Hazard Mater. 2021 Feb 5;403:123927. doi: 10.1016/j.jhazmat.2020.123927. Epub 2020 Sep 15.
Wet flue gas desulfurization (WFGD) sludge, generated from the WFGD effluent treatment process, is suitable for multiple uses in various industries. However, risk assessments of its utilization are limited. Systematic study of Hg species occurrences, partitioning and risks of leaching is required, and these concerns were addressed in the present study. Hg temperature-programmed decomposition (Hg-TPD) and an improved European Community Bureau of Reference (BCR) method indicated residual Hg in WFGD sludge was related to HgS, and the content of this fraction was from 2 to 3%. HgCl, HgO and HgSO were assigned to the water/acid-soluble fractions, and reducible Hg was related to Fe species in the sludge. Leachate evaluation of the WFGD sludge indicated potentially high Hg leaching risk. WFGD sludge with higher Hg concentrations and smaller particulate diameters exhibited greater leaching potential. Leaching of Hg from WFGD sludge in China into the environment was estimated at 7.46 t/yr.
湿式烟气脱硫（WFGD）污泥是从 WFGD 废水处理过程中产生的，适合在各个行业中进行多种用途。然而，其利用的风险评估是有限的。需要对 Hg 形态的出现、分配和浸出风险进行系统研究，本研究解决了这些问题。Hg 程序升温分解（Hg-TPD）和改进的欧洲共同体参考资料局（BCR）方法表明，WFGD 污泥中的残余 Hg 与 HgS 有关，该分数的含量为 2%至 3%。HgCl、HgO 和 HgSO 被分配到水/酸可溶部分，而可还原 Hg 与污泥中的 Fe 物质有关。对 WFGD 污泥的浸出液评价表明，Hg 浸出风险很高。Hg 浓度较高、颗粒直径较小的 WFGD 污泥表现出更大的浸出潜力。估计中国 WFGD 污泥中的 Hg 进入环境的浸出量为 7.46 吨/年。
