Bioelectricity generation in an integrated system combining microbial fuel cell and tubular membrane reactor: Effects of operation parameters performing a microbial fuel cell-based biosensor for tubular membrane bioreactor

• A new type of bio-cathode MFC-based biosensor was developed for COD monitoring.
• The performance of bio-cathode MFC-based biosensor was affected by HRT, MLSS and COD.
• The range of COD concentrations detected by biosensor was increased.
• The MFC–TMBR system produced electricity for biosensing while organic was degraded.

A bio-cathode microbial fuel cell (MFC) with tubular membrane was integrated to construct a microbial fuel cell–tubular membrane bioreactor (MFC–TMBR) system, in which the bio-cathode MFC was developed as a biosensor for COD real-time monitoring in TMBR and the performance was analyzed in terms of its current variation caused by operation parameters. With a constant anode potential, the effect of HRT demonstrated that higher rate of mass transport increased the response of the system. The system was further explored an inverse relationship between TMP and current peak by using EPS concentration under the different MLSS concentration. The sensor output had a linear relationship with COD up to 1000 mg/L (regression coefficient, R2 = 0.97) and MLSS (regression coefficient, R2 = 0.94). The simple and compact bio-cathode MFC biosensor for TMBR using MFC–TMBR integrated system showed promising potential for direct and economical COD online monitoring, and provided an opportunity to widen the application of MFC-based biosensor.