Journal
BIORESOURCE TECHNOLOGY
Volume 147, Issue -, Pages 202-211Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.07.113
Keywords
Kinetic model; Sulfur bioreduction; Microaeration; Data fitting
Funding
- National Natural Science Foundation of China [51176037]
- National High-tech R&D Program of China (863 Program) [2011AA060904]
- National Creative Research Groups [51121062]
- State Key Laboratory of Urban Water Resource and Environment [2012DX06]
- NSC [102-3113-P-110-016]
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This study describes the sulfate-reducing (SR) and sulfide-oxidizing (SO) process using Monod-type model with best-fit model parameters both being reported and estimated. The molar ratio of oxygen to sulfide (R-OS) significantly affects the kinetics of the SR + SO process. The S-0 is produced by SO step but is later consumed by sulfur-reducing bacteria to lead to rebound in sulfide concentration. The model correlated well all experimental data in the present SR + SO tests and the validity of this approach was confirmed by independent sulfur bioreduction tests in four denitrifying sulfide removal (DSR) systems. Modeling results confirm that the ratio of oxygen to sulfide is a key factor for controlling S-0 formation and its bioreduction. Overlooking S bioreduction step would overestimate the yield of S-0. (C) 2013 Elsevier Ltd. All rights reserved.
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