Document Detail


Mercury vapor pressure of FGD scrubber suspensions - effects of pH level, gypsum and iron.
MedLine Citation:
PMID:  22324514     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Calcium based scrubbers designed to absorb HCl and SO2 from flue gases can also remove oxidized mercury. Dissolved mercury halides may have an appreciable partial vapor pressure. Chemical reduction of the dissolved mercury may increase the Hg-emission, thereby limiting the co-removal of mercury in the wet scrubbing process. This paper evaluates the effects of pH level, different gypsum qualities and iron in flue-gas-desulphurization (FGD) scrubber suspensions. The impact of these parameters on mercury vapor pressure was studied under controlled laboratory conditions in model scrubber-suspensions. pH values above 7 exert a major influence by amplifying considerably the mercury concentration in the vapor phase above the FGD scrubber suspension. Gypsum also increases the mercury re-emission. Fe(III) decreases and Fe(II) increases the vapor pressure significantly. The consequences of the findings for a reliable co-removal of mercury in FGD scrubbers are discussed. It is shown that there is an increased risk of poor mercury capture in lime based FGD scrubbers in comparison to limestone FGD scrubbers.
Authors:
Jan Schuetze; Kunth Daniel; Weissbach Sven; Heinz Koeser
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-12
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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