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Evaluation of microaeration strategies in the digestion zone of UASB reactors as an alternative for biogas desulfurization
Environmental Technology ( IF 2.8 ) Pub Date : 2021-09-10 , DOI: 10.1080/09593330.2021.1974574
I M P Castro 1 , L S Azevedo 1 , C L Souza 1
Affiliation  

ABSTRACT

This study aimed at evaluating the microaeration as an alternative for hydrogen sulfide removal from biogas of UASB reactors treating sewage. The set-up consisted of two pilot-scale UASB reactors, including a conventional anaerobic and a modified UASB reactor, operated under microaerated conditions. Air was supplied in the digestion zone, at 1 and 3 m from the bottom of the reactor, and three different air flows were investigated: 10, 20, and 30 mL.min-1, corresponding to 0.003, 0.005 and 0.005 LO2/Linfluent, respectively. The main results showed that the microaeration provided a substantial decrease in hydrogen sulfide concentrations when compared to the concentrations observed in the biogas of the anaerobic UASB reactor. Hydrogen sulfide concentrations remained below 70 ppmv throughout the experimental period, corresponding to an average removal efficiency of 98%. Although a decrease in methane concentrations in biogas was observed, the feasibility of energy use would not be affected. The effect of microaeration on the overall performance of the reactor was evaluated, however, no significant differences were observed. The feasibility of limiting aeration conditions in the reactor digestion zone as an efficient alternative for hydrogen sulfide removal from biogas was demonstrated.



中文翻译:

UASB 反应器消化区微曝气策略作为沼气脱硫替代方案的评估

摘要

本研究旨在评估微曝气作为从 UASB 反应器处理污水的沼气中去除硫化氢的替代方法。该装置由两个中试规模的 UASB 反应器组成,包括一个传统的厌氧反应器和一个改进的 UASB 反应器,在微曝气条件下运行。在距离反应器底部 1 和 3 m 处的消化区供应空气,研究了三种不同的气流:10、20 和 30 mL.min -1,对应于 0.003、0.005 和 0.005 LO 2 / L进水, 分别。主要结果表明,与厌氧 UASB 反应器沼气中观察到的浓度相比,微曝气显着降低了硫化氢浓度。在整个实验期间,硫化氢浓度保持在 70 ppm v以下,对应的平均去除效率为 98%。虽然观察到沼气中甲烷浓度有所降低,但能源利用的可行性不会受到影响。评估了微曝气对反应器整体性能的影响,但是没有观察到显着差异。证明了限制反应器消化区曝气条件作为从沼气中去除硫化氢的有效替代方案的可行性。

更新日期:2021-09-10
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