State and federal cost share programs, university research projects, and other voluntary sources are relied on to track the number of bioreactors and the amount of acres treated. Tracking and reporting of bioreactors in previous NLRS Biennial Reports involved adding new bioreactors to existing counts. However, the life of a bioreactor is approximately 10 years, at which point the woodchips need to be replaced. Beginning with this Biennial Report, bioreactors that are known to be more than 10 years old without being recharged with new woodchips are no longer counted.
Nine woodchip bioreactors treating approximately 382 acres were installed from 2021-22. The 2021 Biennial Report stated that by the end of 2020, there were a total of 42 known woodchip bioreactors treating approximately 1,460 acres. After subtracting bioreactors more than 10 years old, and adding the nine new bioreactors, it is estimated that there are a total of 37 functioning bioreactors currently treating 1,499 acres in Illinois. Of the 37 bioreactors counted, six were older bioreactors that had been recharged with new woodchips or carbon sources.