title: Investigation on mercury reemission from limestone-gypsum wet flue gas desulfurization slurry.
abstract: Secondary atmospheric pollutions may result from wet flue gas desulfurization (WFGD) systems caused by the reduction of Hg(2+) to Hg(0) and lead to a damping of the cobenefit mercury removal efficiency by WFGD systems. The experiment on Hg(0) reemission from limestone-gypsum WFGD slurry was carried out by changing the operating conditions such as the pH, temperature, Cl(-) concentrations, and oxygen concentrations. The partitioning behavior of mercury in the solid and liquid byproducts was also discussed. The experimental results indicated that the Hg(0) reemission rate from WFGD slurry increased as the operational temperatures and pH values increased. The Hg(0) reemission rates decreased as the O2 concentration of flue gas and Cl(-) concentration of WFGD slurry increased. The concentrations of O2 in flue gas have an evident effect on the mercury retention in the solid byproducts. The temperature and Cl(-) concentration have a slight effect on the mercury partitioning in the byproducts. No evident relation was found between mercury retention in the solid byproducts and the pH. The present findings could be valuable for industrial application of characterizing and optimizing mercury control in wet FGD systems.
authors.affiliation: School of Environmental Science & Engineering, North China Electric Power University, Baoding 071003, China.
authors.forename: Chuanmin
authors.identifier: 0000-0002-3636-4653
authors.initials: C
authors.lastname: Chen
authors.affiliation: School of Environmental Science & Engineering, North China Electric Power University, Baoding 071003, China.
authors.forename: Songtao
authors.initials: S
authors.lastname: Liu
authors.affiliation: School of Environmental Science & Engineering, North China Electric Power University, Baoding 071003, China.
authors.forename: Yang
authors.identifier: 0000-0002-7968-7161
authors.initials: Y
authors.lastname: Gao
authors.affiliation: School of Environmental Science & Engineering, North China Electric Power University, Baoding 071003, China.
authors.forename: Yongchao
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000397:Air Pollution / Q000517:prevention & control; D002119:Calcium Carbonate / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008628:Mercury / Q000737:chemistry*; D013696:Temperature
chemical_list: D008628:Mercury; D002119:Calcium Carbonate
references.citation: Environ Sci Technol. 2003 Dec 15;37(24):5763-6
references.pmid: 14717192
references.citation: Chemosphere. 2011 Oct;85(4):565-70
references.pmid: 21764100
references.citation: J Hazard Mater. 2009 Dec 30;172(2-3):1106-10
references.pmid: 19699584
references.citation: J Hazard Mater. 2010 Nov 15;183(1-3):902-7
references.pmid: 20739119
references.citation: J Environ Manage. 2013 May 15;120:55-60
references.pmid: 23500649
references.citation: J Environ Sci (China). 2011;23(11):1839-44
references.pmid: 22432308
references.citation: Environ Sci Technol. 2006 Mar 1;40(5):1385-93
references.pmid: 16568746