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Indexed by:期刊论文

Date of Publication:2018-03-01

Journal:CHEMOSPHERE

Included Journals:SCIE、EI、PubMed

Volume:195

Page Number:817-824

ISSN No.:0045-6535

Key Words:Anammox; Autotrophic denitrification; Electrochemistry technology; Biofilm; Nitrate

Abstract:In this study, an autotrophic denitrification process was successfully coupled with anammox to remove the nitrate by-product via electrochemical technology. When the voltage applied to the combined electrode reactor was 1.5 V, the electrode reaction removed nitrate by using the autotrophic denitrification biomass without affecting the anammox biomass. The nitrogen removal efficiency of the combined electrode reactor reached 99.1% without detectable nitrate at an influent NO2--N/NH4+-N ratio of 1.5. On day 223, using the model calculations based on reaction equations, 19.7% of total nitrogen was removed via the autotrophic denitrification process, while the majority of nitrogen removal (approximately 79.4%) was attributed to the anammox reaction. Small variations of the population numbers and community structure of artificial bacteria according to electron microscopy predicted that the anammox and autotrophic denitrifying biomasses could coexist in the electrode reactor. Then, 16S rRNA analysis determined that the anammox biomass group was always dominant in mixed flora during continuous cultivation. (C) 2017 Elsevier Ltd. All rights reserved.