Application of a 2-step process for the biological treatment of sulfidic spent caustics
Application of a 2-step process for the biological treatment of sulfidic spent caustics
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DOI：
10.1016/j.watres.2011.11.044
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发表时间：
2012-03-01
期刊：
影响因子：
12.8
通讯作者：
Janssen, Albert J. H.
中科院分区：
文献类型：
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作者：
de Graaff, Marco;Klok, Johannes B. M.;Janssen, Albert J. H.
本研究论证了在晕碱性条件下（即pH 9.5, Na+ = 0.8 M）采用两步法生物处理含硫化物废焦渣的可行性和优越性。用合成的溶液在连续进料系统中进行实验，该系统由两个气升反应器组成，在35℃的好氧条件下串联运行。第一步硫化物解毒为硫代硫酸盐，使总s负载率达到33 mmol L-1天（-1）。在生物步骤2中，剩余的硫化物和硫代硫酸盐被亲卤碱性硫化物氧化菌完全转化为硫酸盐。两步工艺的数学模型表明，在一般条件下，最佳反应器配置由40%的“非生物”和60%的“生物”体积组成，而反应器的总体积比一步工艺小22%。(C) 2011 Elsevier Ltd.版权所有。
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.