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- W2187263503 abstract "The impact of hydrogen sulfide (H 2 S) from well venting, and the impact of nitrogen dioxide (NO 2 ) from drill rig diesel engines, to ambient air adjacent to well pads are typically the two most significant air quality issues associated with geothermal development. The traditional use of abatement chemicals to mitigate H 2 S impacts and of reductive catalysts or ignition retardation to mitigate NO 2 impacts are costly and have other environmental “side effects.” The use of appropriately designed well silencers and drill rig engine exhaust systems can reduce the need for these undesirable and costly control options. Another cost-effective mitigation strategy is based on an iterative meteorological monitoring approach. By correlating ambient air impacts with meteorological conditions, the use of abatement chemicals can be limited to only those time periods that will cause unacceptable pollutant levels. Impacts and meteorological conditions can be correlated by analysis with the standard, regulatory-based U.S. Environmental Protection Agency ISC3 dispersion model. In regards to the NO2 impact from drill rig engines, accurate emission data are useful in that only a small fraction of the total nitrogen oxides (NO x) emitted from diesel engines are in the form of NO 2 , most is in the more benign nitric oxide (NO) form. (Source tests often only provide a total nitrous oxides value reported as NO 2 or an estimate of the NO 2 fraction.) Finally, an understanding of site-specific atmospheric chemistry and physics is very important for drill rig engine impact assessment, since NO is oxidized to NO 2 by oxidants (viz., ozone) in the atmosphere. Unlike the typical assessment of NO2 impacts from most industrial sources, consideration of the transit time of exhaust gases from drill rig engines to reach the points of" @default.
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- W2187263503 date "1999-01-01" @default.
- W2187263503 modified "2023-09-26" @default.
- W2187263503 title "Mitigation and Calculation of Short-term Hydrogen Sulfide and Nitrogen Dioxide Impacts to Ambient Air Adjacent to Geothermal Well Pads" @default.
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