Maintenance of continuous emissions mercury monitoring systems (HgCEMS) under the U.S. EPA Portland Cement (PC) MACT rules

With the issuance of EPA's Portland Cement (PC) Maximum Achievable Control Technology (MACT) rule, the industry is faced with a number of new challenges relative to both hazardous air pollutants (HAPs) control and monitoring. This paper focuses on the monitoring of mercury (Hg), with particular emphasis on electronic (AKA “real-time”) Continuous Emissions Monitoring Systems (CEMS). A description of the monitoring technology and the experiences and requirements for its service and maintenance is also included. Finally, the case is made for the prospect of using a real-time HgCEMS for air pollution control equipment performance monitoring and control, as well as regulatory compliance.