Emerging and Innovative Technologies
397207 - Long term performance and evaluation of advanced wastewater treatment in anammox bioelectrochemical systems
Monday, June 4
2:00 PM - 3:30 PM
Location: Lakeshore C
Umesh Ghimire, 501 Hardy Road, 235 Walker Hall – Mississippi State University; Veera Gnnaeswar Gude, 501 Hardy Road, 235 Walker Hall – Mississippi State University
Discharge of nitrogenous compounds in water bodies, municipal and industrial wastewaters causes eutrophication which promotes excessive growth of microalgae and cyanobacteria. Microbial desalination cells (MDCs), a form of bioelectrochemical systems, allow for simultaneous wastewater treatment (both carbon and nutrient removal) and desalination of saline water with concurrent electricity production. This study describes the use of an autotrophic microorganism, Anammox bacteria, as a sustainable biocatalyst/biocathode in MDCs to provide for an advanced, energy-positive wastewater treatment. Our preliminary research has shown that using an autotrophic microbial culture containing anammox bacteria as the biocathode or biocatalyst for simultaneous energy generation and wastewater treatment is a feasible option. Batch experiments improved the coulombic efficiency of the system as well as the nitrite and ammonium removal of the wastewater. A maximum power of 0.114 W/m3 with more than 90% removal of ammonium was achieved in this system. The findings of this research showed that this system is more useful for wastewaters with low C/N ratio to suppress the possibility for growth of heterotrophic bacteria. Here, we present the microbial population dynamics, wastewater treatment performance trends and energy and resource recovery capacities of anammox bioelectrochemical systems from a long term operation and process control point of view. A detailed account of microbial biofilm analysis for both anode and cathode, process benefits through mass (carbon, nitrogen and salt) and energy balances will be presented. Future directions for developing sustainable water and resource recovery systems based on anammox bioelectrochemical platform will be discussed.