期刊
WATER RESEARCH
卷 46, 期 3, 页码 723-730出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2011.11.044
关键词
Spent caustics; Haloalkaliphilic; Sulfide oxidation; Bioreactor modeling; Thioalkalivibrio
资金
- Dutch Ministry of Economic Affairs
- European Union
- Province of Fryslfin
- City of Leeuwarden
- Samenwerkingsverband Noord-Nederland
This research demonstrates the feasibility and advantages of a 2-step process for the biological treatment of sulfidic spent caustics under halo-alkaline conditions (i.e. pH 9.5; Na+ = 0.8 M). Experiments with synthetically prepared solutions were performed in a continuously fed system consisting of two gas-lift reactors in series operated at aerobic conditions at 35 degrees C. The detoxification of sulfide to thiosulfate in the first step allowed the successful biological treatment of total-S loading rates up to 33 mmol L-1 day(-1). In the second, biological step, the remaining sulfide and thiosulfate was completely converted to sulfate by haloalkaliphilic sulfide oxidizing bacteria. Mathematical modeling of the 2-step process shows that under the prevailing conditions an optimal reactor configuration consists of 40% 'abiotic' and 60% 'biological' volume, whilst the total reactor volume is 22% smaller than for the 1-step process. (C) 2011 Elsevier Ltd. All rights reserved.
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