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.