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Mercury re-emission in flue gas multipollutants simultaneous absorption system
Yue Liu1, Qingfeng Wang, Rongjun Mei
1Department of Environmental Engineering, Zhejiang University , Hangzhou 310058, P. R. China.
Nitrite ions significantly impact mercury re-emission in wet flue gas desulfurization (WFGD) systems by initially promoting Hg(0) emission but later inhibiting it. Chloride ions further suppress mercury re-emission by forming stable complexes.
Area of Science:
- Environmental Chemistry
- Industrial Chemistry
Background:
- Simultaneous removal of SO2, NOx, and oxidized mercury in wet flue gas desulfurization (WFGD) is a key research area.
- Mercury re-emission is a known issue in traditional WFGD due to oxidized mercury reduction by sulfite ions.
Purpose of the Study:
- To investigate the influence of nitrate and nitrite ions on mercury re-emission within multipollutant WFGD systems.
- To elucidate the underlying mechanisms of mercury re-emission influenced by these ions.
Main Methods:
- Experimental study on mercury re-emission in WFGD absorbers.
- Analysis of the effects of varying nitrate and nitrite ion concentrations.
- Investigation of the impact of chloride ion addition.
Main Results:
- Nitrate ions showed a negligible effect on mercury re-emission.
- Nitrite ions exhibited a dual effect: initially improving Hg(0) emission, then inhibiting it at higher concentrations due to Hg-nitrite complex formation.
- Chloride ions significantly suppressed Hg(0) emission, likely via a stable Hg-SO3-NO2-Cl complex.
Conclusions:
- Nitrite ions play a critical role in mercury re-emission dynamics in WFGD systems.
- The formation of specific complexes (Hg-nitrite, Hg-SO3-NO2-Cl) dictates mercury behavior.
- Chloride addition offers a potential strategy to mitigate mercury re-emission.
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