4. CONCLUSION
The impact of anodophilic biofilms bioelectroactivity on denitrification behavior of single-chamber air-cathode microbial fuel cell (SAMFC) in steady state was studied. Results showed that the denitrification rates of the SAMFCs increased with time and achieved a stable level after running for about 80 days. The SAMFC-20Ω showed lower denitrification rate than the SAMFC-1000Ω at the 20th day, but surpassed it after running for over 40 days. The SAMFC-20Ω not only generated 61.7% higher power than the SAMFC-20Ω, but also achieved a 50% and 40% higher kDN than the SAMFC-1000Ω and SAMFC-OC, respectively. The enhanced power generation and denitrification performance was attributed to the high bioelectroactivity of the anodophilic biofilms, which not only promote current generation, but also improved BEDN facilitated the enrichment of other denitrifers. This study provides an important theoretical basis for enhancing power generation and denitrification performance of SAMFC synchronously, would promote its practical application for wastewater treatment.