Simultaneous Production of Bio-energy and Bio-treatment of Wastewater Using Photosynthetic Microbial Fuel Cell: Optimization and Kinetic Modeling Approach

Jagdeep Kumar Nayak, Saurabh Mishra, Amit, Uttam Kumar Ghosh

Research output: Contribution to journalArticlepeer-review

Abstract

Photosynthetic microbial fuel cell (PMFC) is a promising technology for simultaneous treatment of wastewater, bioelectricity generation, and algal biomass production in single stage. The performance of PMFC depends on the activity of algae and bacteria, which are governed by the rate limiting operational parameters (like initial chemical oxygen demand (COD) concentration, nitrate concentration, amount of yeast extract (YE), and hydraulic retention time (HRT)). The present study aims to investigate the effect of these operational parameters on COD and nitrate removal efficiency along with voltage generation from PMFC. These operational parameters are optimized using response surface methodology for effective system function. The resultant data analysis of variance reveals that the parameters HRT and YE has positive integrative effect (with estimated coefficient value of 5.92) on nitrate removal efficiency, while negative integrative effect (− 1.97) on COD removal efficiency. The maximum COD and nitrate removal of 86.35 ± 0.4% and 75.85 ± 0.4% are obtained from the separate optimized model validated experiments for COD and nitrate removal, respectively that exhibit the satisfactory correlation with model-predicted-response. Meanwhile, the maximum voltage of ~ 790 ± 0.4 mV and biomass of ~ 0.80 ± 0.05 g L−1 for biofuel-feed-stock is obtained during the same experiments. The response data obtained during kinetic study of COD and nitrate removal are analyzed using first order model that exhibits K1 value of 1.127 day−1 for COD removal and 1.882 day−1 for nitrate removal. The same response data are analyzed using Grau model that exhibits K2 value of 3.67 day−1 for COD removal and 31.25 day−1 for nitrate removal. The optimized process demonstrated in this study would be useful for simultaneous production bio-energy and efficient wastewater treatment using PMFC. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)69-84
Number of pages16
JournalWaste and Biomass Valorization
Volume14
Issue number1
DOIs
Publication statusPublished - Jan 2023
Externally publishedYes

Keywords

  • Biomass production
  • Kinetic modeling
  • Photosynthetic microbial fuel cell
  • Response surface methodology
  • Voltage generation

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