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

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Jing, He Wang, Xiaofei Wang, Wei-Ning Biswas, Pratim
Description	Country affiliation: United States Author Affiliation: Jing H ( a Aerosol and Air Quality Research Laboratory, Department of Energy , Environmental and Chemical Engineering, Washington University in St. Louis , St. Louis , MO , USA.)
Abstract	UNLABELLED: 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. IMPLICATIONS: Mercury is a significant-impact atmospheric pollutant due to its toxicity. Coal-fired power plants are the primary emission sources of anthropogenic releases of mercury; hence, mercury emission control from coal-fired power plant is important. This study provides an alternative mercury control technology for coal-fired power plants. The proposed electrostatic precipitator with in situ soft X-rays has high efficiency on elemental mercury conversion. Effects of flue gas conditions (gas compositions, particles, etc.) on performance of this technology were also evaluated, which provided guidance on the application of the technology for coal-fired power plant mercury control.
File Format	HTM / HTML
ISSN	10962247
e-ISSN	21622906
Journal	Journal of the Air & Waste Management Association
Issue Number	4
Volume Number	65
Language	English
Publisher	Taylor & Francis
Publisher Date	2015-04-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Health Air Pollutants Chemistry Mercury Static Electricity Coal Ash Gases Oxidation-reduction Particulate Matter Power Plants X-rays Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science Pollution Waste Management and Disposal Management, Monitoring, Policy and Law

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