title: Effects of additional fermented food wastes on nitrogen removal enhancement and sludge characteristics in a sequential batch reactor for wastewater treatment.
abstract: In order to enhance nitrogen removal from domestic wastewater with a carbon/nitrogen (C/N) ratio as low as 2.2:1, external carbon source was prepared by short-term fermentation of food wastes and its effect was evaluated by experiments using sequencing batch reactors (SBRs). The addition of fermented food wastes, with carbohydrate (42.8 %) and organic acids (24.6 %) as the main organic carbon components, could enhance the total nitrogen (TN) removal by about 25 % in contrast to the 20 % brought about by the addition of sodium acetate when the C/N ratio was equally adjusted to 6.6:1. The fermented food waste addition resulted in more efficient denitrification in the first anoxic stage of the SBR operation cycle than sodium acetate. In order to characterize the metabolic potential of microorganisms by utilizing different carbon sources, Biolog-ECO tests were conducted with activated sludge samples from the SBRs. As a result, in comparison with sodium acetate, the sludge sample by fermented food waste addition showed a greater average well color development (AWCD590), better utilization level of common carbon sources, and higher microbial diversity indexes. As a multi-organic mixture, fermented food wastes seem to be superior over mono-organic chemicals as an external carbon source.
authors.affiliation: Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China.|Engineering Technology Research Center for Wastewater Treatment and Reuse, Xi'an, Shaanxi Province, 710055, People's Republic of China.
authors.forename: Yongmei
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China. xcwang@xauat.edu.cn.|International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an, 710055, People's Republic of China. xcwang@xauat.edu.cn.
authors.forename: Xiaochang C
authors.initials: XC
authors.lastname: Wang
authors.affiliation: Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China.|Engineering Technology Research Center for Wastewater Treatment and Reuse, Xi'an, Shaanxi Province, 710055, People's Republic of China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Cheng
authors.affiliation: Graduate School of Environmental Studies, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi, 980-8579, Japan.
authors.forename: Yuyou
authors.initials: Y
authors.lastname: Li
authors.affiliation: Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China.|Engineering Technology Research Center for Wastewater Treatment and Reuse, Xi'an, Shaanxi Province, 710055, People's Republic of China.
authors.forename: Jialing
authors.initials: J
authors.lastname: Tang
mesh_terms: D019149:Bioreactors; D002244:Carbon / Q000378:metabolism; D058440:Denitrification; D005285:Fermentation; D005502:Food; D009584:Nitrogen / Q000378:metabolism*; D009930:Organic Chemicals / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D002244:Carbon; D009584:Nitrogen; D009930:Organic Chemicals; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Fermented food wastes; Nitrogen removal; Sequential batch reactor; Sodium acetate