Journal
WATER RESEARCH
Volume 170, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2019.115300
Keywords
Activated sludge; Autotrophic iron-dependent denitrification (AIDD); Gallionellaceae; Kinetic modeling; Wastewater treatment
Funding
- National Key R&D Program of China [2018YFC0406303]
- National Natural Science Foundation of China [21590812, 51538011, 21607146, 51821006]
- Program for Changjiang Scholars, Innovative Research Team in University of the Ministry of Education of China
- China Postdoctoral Science Foundation [2018M642543]
- Anhui Provincial Natural Science Foundation [1908085QB88]
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Autotrophic iron-dependent denitrification (AIDD) is arising as a promising process for nitrogen removal from wastewater with a low carbon to nitrogen ratio. However, there is still a debate about the existence of such a process in activated sludge systems. This work provides evidence and elucidated the feasibility of autotrophic Fe(II)-oxidizing nitrate-reducing culture for nitrogen removal by long-term reactor operation, batch experimental verification, unstructured kinetic modeling and microbial community analyses. A relatively stable nitrate removal rate was achieved coupled with the oxidation of ferrous ions in 3-month operation of reactor. The kinetic modeling suggests that the iron oxidation was a growth-associated process in AIDD. Utilization of extracellular polymeric substances (and/or soluble microbial products) as electron donor for denitrification by heterotrophic denitrifiers was not mainly responsible for nitrogen removal in the reactor. After long-term operation of the reactor with activated sludge as inoculum, the enrichment culture KS-like consortium, dominated by Fe(II) oxidizer, Gallionellaceae, was successfully acclimated for autotrophic Fe(II)-oxidizing nitrate reduction. This work extents our understanding about the existence of such an autotrophic Fe(II)-oxidizing nitrate-reducing culture in both natural and engineered systems, and opens a door for its potential application in wastewater treatment. (C) 2019 Elsevier Ltd. All rights reserved.
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