An industrial biomass energy facility had air permit compliance issues relating back to initial permitting of its facility. Pinnacle Engineering (Pinnacle) became involved with the client during stack testing of the source, which showed that SO2 emissions were much higher than predicted and originally permitted. Pinnacle was contracted to provide engineering services, air permitting related services, and air dispersion modeling services. During the past few years, these services have included:
- Revised Potential-To-Emit (PTE) Calculations.
- Best Available Control Technology (BACT) Analysis.
- Engineering review and recommendations on best available control technology options from a technical standpoint.
- Stack testing engineering assistance.
- Air permitting services (MPCA forms, flow diagrams, & technical review).
- Air Dispersion Modeling Analysis for PM10 and SO2 (additional PM10, PM2.5, and NOx modeling scenarios will be analyzed in near future).
- Ongoing permit negotiations with the client and MPCA representatives in the permitting, enforcement, and air dispersion modeling groups.
Pinnacle has recommended appropriate SO2 control equipment for the client’s specific operations. In addition, Pinnacle has defended the BACT analysis presented to the MPCA as well as appropriate SO2 permit limits for this type of process. Over the course of this project, Pinnacle has also completed many permitting requirements for the client to satisfy the MPCA’s numerous permitting updates and requests.
Air dispersion modeling had been challenging for SO2 due to major contributions from a nearby source. Both the MPCA and EPA were involved in reviewing and establishing the modeling parameters that were required for showing compliance with SO2 permitted emissions. The SO2 modeling was approved in a way that was acceptable to the clients operations after several iterations, discussions, and negotiations with the regulatory agencies involved.