Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

He Jing, Xiaofei Wang, Wei Ning Wang, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Corona discharge based techniques are promising approaches for oxidizing elemental mercury (Hg0) in flue gas from coal combustion. In this study, in-situ soft X-rays were coupled to a DC (direct current) corona-based electrostatic precipitator (ESP). The soft X-rays significantly enhanced Hg0 oxidation, due to generation of electrons from photoionization of gas molecules and the ESP electrodes. This coupling technique worked better in the positive corona discharge mode because more electrons were in the high energy region near the electrode. Detailed mechanisms of Hg0 oxidation are proposed and discussed based on ozone generation measurements and Hg0 oxidation behavior observations in single gas environments (O2, N2, and CO2). The effect of O2 concentration in flue gas, as well as the effects of particles (SiO2, TiO2, and KI) was also evaluated. In addition, the performance of a soft X-rays coupled ESP in Hg0 oxidations was investigated in a lab-scale coal combustion system. With the ESP voltage at +10 kV, soft X-ray enhancement, and KI addition, mercury oxidation was maximized.

Original languageEnglish (US)
Pages (from-to)455-465
Number of pages11
JournalJournal of the Air and Waste Management Association
Issue number4
StatePublished - 2015
Externally publishedYes

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law


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