Enhanced nitrogen removal by membrane-aerated nitritation-anammox in a bioelectrochemical system. (August 2017)

• Record Type: Journal Article
• Authors: Yang, Yuli; Li, Xiaojin; Yang, Xiaoli; He, Zhen
• Is Part Of: Bioresource technology. Volume 238(2017)
• Page Start: 22
• Page End: 29
• Publication Date: 2017-08
• Subjects: Bioelectrochemical system -- Nitrogen removal -- Anammox -- Membrane aeration -- Microbial community; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.04.022
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Membrane-aerated nitritation-anammox is conducted in a bioelectrochemical system. Biocathode with anammox can improve both organic and nitrogen removal. This BES is potentially energy efficient and has low specific energy consumption. AOB, anammox, denitrifier, and electrogenic bacteria are abundant in the cathode. The distribution for microorganisms is affected by aeration and location. Abstract: A bioelectrochemical system (BES) containing membrane-aerated nitritation-anammox in its cathode has been developed for enhancing nitrogen removal. Long-term performance and microbial community structure were investigated. The BES using loop operation and external voltage achieved the highest total nitrogen removal efficiency of 94.8 ± 7.7%, and COD removal of 98.2 ± 3.3% at hydraulic retention time of 60 h and the lumen pressure of 10 psi. The energy consumption of the system was 0.90 kWh kg N −1 or 0.38 kWh kg COD −1 . Sequencing analyses revealed that ammonia oxidizing bacteria (0.2–7.4%), anammox bacteria (0.4–10.3%), denitrifying bacteria (5.8–13.1%), and electrogenic bacteria (4.6–12.8%) were in abundance of the microbial community in the cathode chamber, and their distributions were affected by the aeration and physical locations. These results encourage further investigation of membrane-aerated nitritation-anammox in BES for optimization and potential applications with actual wastewater.