Barr prepared an air permit application for a Minnesota facility that processes biogas generated by anaerobic digestion at three large dairy farms. The biogas is conditioned into pipeline-quality renewable natural gas (RNG) and injected into a natural gas pipeline.
Strategic permitting considerations centered on whether the three gas-processing facilities and the central processing plant should be covered under one permit or permitted separately. Barr used predicted biogas properties to help our client determine achievable operating scenarios that would keep emissions of sulfur dioxide and carbon monoxide below New Source Review and Title V air permitting thresholds if all facilities were grouped under one permit.