Microbial carbon capture cell using cyanobacteria for simultaneous power generation, carbon dioxide sequestration and wastewater treatment.
Microbial carbon capture cells (MCCs) were constructed with cyanobacteria growing in a photo biocathode in dual-chambered flat plate mediator-less MFCs separated by an anion exchange membrane from the anode compartment containing Shewanella putrefaciens. The performance of the MCC with Anabaena sparged with CO(2)-air mixture was compared with that of a conventional cathode sparged with air only. The power densities achieved were 57.8 mW/m(2) for Anabaena sparged with a CO(2)-air mixture, 39.2 mW/m(2) for CO(2)-air mixture sparging only, 29.7 mW/m(2) for Anabaena sparged with air, and 19.6 mW/m(2) for air sparging only. The pH of the cathode containing Anabaena gradually increased from 7 to 9.12 and power generation decreased from 34.7 to 23.8 mW/m(2) 17 due to pH imbalance associated voltage losses without CO(2)-air mixture sparging. Sparging with a 5% CO(2)-air mixture produced maximum power of 100.1 mW/m(2). In addition, the power density of MCC increased by 31% when nitrate was added into the catholyte.
Department of Biotechnology, Indian Institute of Technology, Kharagpur, West Bengal, India.
Soumya
S
Pandit
Bikram Kumar
BK
Nayak
Debabrata
D
Das
D017033:Anabaena / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism*; D000458:Cyanobacteria / Q000378:metabolism*; D011211:Electric Power Supplies; D008027:Light; D020614:Shewanella putrefaciens / Q000378:metabolism*; D014873:Water Pollutants / Q000378:metabolism*
D014873:Water Pollutants; D002245:Carbon Dioxide