Geosyntec's air quality clients ask for a variety of services for emission control device conceptual design, selection, feasibility, monitoring, evaluation, and optimization for their facilities.

They are required to evaluate emission controls operating under the most complex regulatory and operational conditions and advise clients on potential avenues for optimization that meet emission standards, such as best available control technology (BACT), while minimizing the operational costs and compliance risks of their facilities. This includes identification, quantification and potential control of secondary pollutant impacts, such as combustion by-products, reactive compounds, greenhouse gas emissions, or waste or wastewater streams.

Geosyntec practitioners have expertise in process design as well as air pollution control technology design that enables us to develop strategic approaches to complex, multi-pollutant emission challenges brought about by evolving emission standards on existing equipment and operations, and new capital project expansions, facilities and emission sources. Our project portfolio and in-house expertise includes control of gaseous pollutants (e.g., scrubbing, adsorption, condensation, catalytic reduction and oxidation), combustion management and tuning for boilers, thermal oxidizers, and other combustion devices, particulate filtration, precipitation and collection systems, dust control, and a variety of approaches to control toxic air contaminants.

We also have expertise in the measurement of control system performance by applying standard emission measurement protocols, U.S. Environmental Protection Agency (EPA) test methodologies and other acceptable evolving measurement science to determine compliance or reduction potential for common criteria air pollutants (volatile organic compounds (VOC), nitrogen oxides (NOx), carbon monoxide (CO), sulfur dioxide (SO2), and particulate matter), toxic air contaminants and difficult compounds such as mercury and sulfur trioxide (SO3). For example, Geosyntec offers installation of state-of-the-practice hardware and software that utilizes cross-duct laser technology for continuous monitoring of ammonia (NH3) and SO3. We also provide assistance with Continuous Emission Monitoring System (CEMS) selection and programs for CEM compliance with federal state and consent decree monitoring provisions. Additionally, we often prepare CEM data QA/QC plans, data interface for emission calculations and, data management.

Through additional research, our experts have developed emission measurement methodologies that enable pollutant-specific measurements under highly complex operating conditions. In just one project example for a client in the electric power industry, Geosyntec helped to select a portable mercury analyzer that accurately quantified elemental and oxidized mercury concentrations in flue gas at multiple locations between a power plant's selective catalytic reduction outlet and a stack. The client needed the ability to monitor the gas in real time for extended engineering studies that examined how the plant responded to different operating conditions in preparation for compliance with the U.S. EPA Mercury and Air Toxics Standards (MATS). Our engineers and scientists aided the utility in identifying and installing the best process monitors for their particular needs and modified the vendor technology by adding wireless data transmission functionality and the ability to calibrate the flue gas monitors remotely. We also examined the operational effects of the technology on flue gas mercury concentrations and identified opportunities for mercury reduction through operational changes.

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