149 0

Nitrite Accumulation From Simultaneous Free-Ammonia and Free-Nitrous-Acid Inhibition and Oxygen Limitation in a Continuous-Flow Biofilm Reactor

Title
Nitrite Accumulation From Simultaneous Free-Ammonia and Free-Nitrous-Acid Inhibition and Oxygen Limitation in a Continuous-Flow Biofilm Reactor
Author
배우근
Keywords
ammonium oxidation; biofilm; free ammonia inhibition; oxygen limitation; nitrite accumulation; PARTIAL NITRIFICATION; OPERATING-CONDITIONS; NITRIFYING BIOFILMS; MODEL; OXIDATION; KINETICS; REMOVAL; PH; TEMPERATURE; DETACHMENT
Issue Date
2015-01
Publisher
WILEY-BLACKWELL
Citation
BIOTECHNOLOGY AND BIOENGINEERING, v. 112, No. 1, Page. 43-52
Abstract
To achieve nitrite accumulation for shortcut biological nitrogen removal (SBNR) in a biofilm process, we explored the simultaneous effects of oxygen limitation and free ammonia (FA) and free nitrous acid (FNA) inhibition in the nitrifying biofilm. We used the multi-species nitrifying biofilm model (MSNBM) to identify conditions that should or should not lead to nitrite accumulation, and evaluated the effectiveness of those conditions with experiments in continuous flow biofilm reactors (CFBRs). CFBR experiments were organized into four sets with these expected outcomes based on the MSNBM as follows: (i) Control, giving full nitrification; (ii) oxygen limitation, giving modest long-term nitrite build up; (iii) FA inhibition, giving no long-term nitrite accumulation; and (iv) FA inhibition plus oxygen limitation, giving major long-term nitrite accumulation. Consistent with MSNBM predictions, the experimental results showed that nitrite accumulated in sets 2-4 in the short term, but long-term nitrite accumulation was maintained only in sets 2 and 4, which involved oxygen limitation. Furthermore, nitrite accumulation was substantially greater in set 4, which also included FA inhibition. However, FA inhibition (and accompanying FNA inhibition) alone in set 3 did not maintained long-term nitrite accumulation. Nitrite-oxidizing bacteria (NOB) activity batch tests confirmed that little NOB or only a small fraction of NOB were present in the biofilms for sets 4 and 2, respectively. The experimental data supported the previous modeling results that nitrite accumulation could be achieved with a lower ammonium concentration than had been required for a suspended-growth process. Additional findings were that the biofilm exposed to low dissolved oxygen (DO) limitation and FA inhibition was substantially denser and probably had a lower detachment rate. (C) 2014 Wiley Periodicals, Inc.
URI
http://onlinelibrary.wiley.com/doi/10.1002/bit.25326/fullhttps://repository.hanyang.ac.kr/handle/20.500.11754/100623
ISSN
0006-3592; 1097-0290
DOI
10.1002/bit.25326
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ETC
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE