Abstract
The present study details the application of potential halophiles obtained from desalination plant for treatment of seafood wastewater and energy production under high saline condition (8%). Air cathode microbial fuel cell (ACMFC) reactor was employed to study the wastewater treatment efficacy of halophiles under high saline condition. Research investigation was performed at different organic load (OL) 0.5, 1, 1.25 and 1.5 gCOD/L under high saline condition. Initial TCOD (Total Chemical Oxygen Demand) removal efficiency at 0.5 gCOD/L was 58 1.2%% with 340 mW/m(2) power density by the halophiles in ACMFC. Increment in OL to 1 and 1.25 gCOD/L recorded 85 +/- 2.1% and 90 +/- 2% TCOD removal with corresponding power density of 550 and 570 mW/m(2) in ACMFC operated under saline condition. Further increase in the OL to 1.5 gCOD/L revealed decrease in the TCOD reduction and energy production. The maximum electricity of 980 mV with power density of 570 mW/m(2) and 600 mA/m(2)current density was generated at 1.25 gCOD/L. Columbic efficiency was 52% at 0.5 gCOD/L and declined to 33% and 23% at 1 and 1.25 gCOD/L OL concentration. A maximum TSS removal of 78 +/- 1.5% was attained at 1.25 gCOD/L OL in ACMFC. The study revealed 1.25 gCOD/L as the optimized OL for potential treatment of seafood industrial wastewater and energy production. Bacterial community analysis performed with samples from anode and sludge region disclosed the presence of dynamic halophilic strains such as Ochrobactrum (MT118968), Marinobacter (MT118969), Martelella (MT118970), Rhodococcus (MT118971), Bacillus (MT118972), Stenotrophomonas (MT118973), Alicyclobacillus (MT118974), Microbacterium (MT118975), Xanthobacter (MT118976), Pseudomonas (MT118977) and Sedimentibacter (MT118978). Predominance of Ochrobactrum, Marinobacter, Martelella, Rhodococcus and Bacillus depicted at 1.25 gCOD/L in the anode and sludge samples from ACMFC. (C) 2020 Elsevier B.V. All rights reserved.