Hits:

Indexed by:期刊论文

Date of Publication:2017-03-15

Journal:BIOCHEMICAL ENGINEERING JOURNAL

Included Journals:SCIE、EI

Volume:119

Page Number:20-26

ISSN No.:1369-703X

Key Words:Biofilm thickness; Anammox; Dissolved oxygen; Biofilms; Bioreactors; Waste-water treatment

Abstract:The overall influence of dissolved oxygen (DO) concentrations and biofilm thicknesses on single stage anammox process performance has been evaluated in this study. Results indicated the biofilm displayed a rapid initial increase and followed by a relatively slower formation rate during the operational period. The optimal DO concentration could be determined from a variety of biofilm thicknesses and as well the best biofilm thickness was required among different DO levels. In our lab-scale single stage anammox reactor with a constant hydraulic retention time of 1.0h and influent ammonium of 400 mg L-1, an optimal nitrogen removal capacity was acquired (TN removal loading of 2.18 kg-N m(-3) d(-1)) at the DO level of 0.6 mg L-1 and biofilm thickness of 700 mu m. Species identification showed that Nitrosomonas related aerobic ammonium-oxidizing bacteria (AerAOB) and Candidatus Brocadia fulgida-like anaerobic ammonium-oxidizing bacteria (AnAOB) were the predominant functional bacteria mixed together with each other and exhibited no distinct niche. However, AerAOB exhibited higher biodiversity at the thinner biofilm while AnAOB showed a stable but lower biodiversity. Moreover, the population of AnAOB was smaller along with more scattered cells at the thinner biofilm while they trended to form specific irregular cauliflower-like zooglea as biofilm thickness increased. (C) 2016 Elsevier B.V. All rights reserved.