Two identical lab-scale bioreactor systems were operated to examine the effects of granular activated carbon (GAC) on methane removal performance and methanotrophic community. Both bioreactor systems removed methane completely at a CH4 loading rate of 71.2 g-CH4·d-1 for 17 days. However, the methane removal efficiency declined to 88% in the bioreactor without GAC, while the bioreactor amended with GAC showed greater methane removal efficiency of 97% at a CH4 loading rate of 107.5 g-CH4·d-1. Although quantitative real-time PCR showed that methanotrophic populations were similar levels of 5-10 × 108 pmoA gene copy number·VSS-1 in both systems, GAC addition changed the methanotrophic community composition of the bioreactor systems. Microarray assay revealed that GAC enhanced the type I methanotrophic genera including Methylobacter, Methylomicrobium, and Methylomonas of the system, which suggests that GAC probably provided a favorable environment for type I methanotrophs. These results indicated that GAC is a promising support material in bioreactor systems for CH4 mitigation.
|Number of pages||8|
|Journal||Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering|
|State||Published - 28 Jan 2015|
- granular activated carbon