title: Coupling of anaerobic digester and microbial fuel cell for COD removal and ammonia recovery.
abstract: Microbial fuel cells (MFCs) were investigated for use in removing total ammonia nitrogen (TAN) and residual COD from effluent digested in an anaerobic digester (AD) fed with actual swine wastewater for 32 days in batch mode. Cumulative COD removal in the AD was as high as 59,647±2096 mg/L (80.5% removed), whereas TAN removal in the AD was negligible at 296±116 mg-N/L (5.8% removed), causing a decrease in the COD/TAN ratio from 14.5 to 3.0. In a subsequent MFC system, 77.5% of TAN was removed at 36 days, leading to an increase in COD/TAN ratio from 4.6 to 8.1. As a result, the COD in the anode was further reduced from 19,319±417 mg/L to 7519±554 mg/L (61.1% removed). From these results, removing the TAN in MFCs was found to increase the COD/TAN ratio, with the COD being further degraded.
authors.affiliation: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Republic of Korea.
authors.forename: Taeyoung
authors.initials: T
authors.lastname: Kim
authors.affiliation: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Republic of Korea.
authors.forename: Junyeong
authors.initials: J
authors.lastname: An
authors.affiliation: Energy and Environmental Engineering Division, National Institute of Agricultural Science, Rural Development Administration, Jeonju-si 560-500, Republic of Korea.
authors.forename: Jae Kyung
authors.initials: JK
authors.lastname: Jang
authors.affiliation: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Republic of Korea. Electronic address: ischang@gist.ac.kr.
authors.forename: In Seop
authors.initials: IS
authors.lastname: Chang
mesh_terms: D000641:Ammonia / Q000302:isolation & purification*; D000693:Anaerobiosis; D000818:Animals; D001674:Bioelectric Energy Sources; D057919:Biological Oxygen Demand Analysis; D005232:Fatty Acids, Volatile / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000032:analysis; D013552:Swine; D062065:Wastewater; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
chemical_list: D000641:Ammonia; D005232:Fatty Acids, Volatile; D008697:Methane; D062065:Wastewater
keywords: Ammonia removal; Anaerobic digestion; Microbial fuel cell; Swine wastewater; Wastewater treatment