利用文丘里射流作为强化曝气系统,改善生物 Fe2+ 氧化过程中溶解氧的传输

IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
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引用次数: 0

摘要

作为浸出剂的铁的生物产量低是在可行条件下实施工业生物工艺的主要限制之一。铁的生物氧化过程的主要限制是,由于氧气溶解度低,向水相转移的氧气量少。与传统的扩散器曝气装置相比,本研究评估了文丘里喷射器作为一种创新的强化曝气装置在固定床反应器中连续铁氧化过程中克服氧限制的有效性。首先,确定了两种曝气装置的下列参数对气流和介质浓度的影响:体积传质系数(ka)、标准氧速率(SOTR)、标准曝气效率(SAE)和标准氧传递效率(SOTE)。然后,在上流式填料生物反应器(UFPB)的连续生物氧化过程中对两种曝气装置进行了比较。通过监测温度、pH 值、氧化还原电位和溶解氧浓度,对系统性能进行了为期 69 天的评估。研究结果表明,在使用扩散器通气时,亚铁的氧化率受到溶解氧含量低的限制,约为百万分之 1(1 毫克/升)。在这种氧气限制条件下,亚铁(Fe)的最大氧化率为 9.09 克/升(小时)。然而,当使用文丘里管喷射器通气时,溶解氧浓度增加到 2.70 毫克/升,最大氧化率达到 29.11 克/升(小时)。此外,文丘里喷射器与扩散器相比还具有更多优点,如提供相同数量的空气所需的功率更小、不受箭石沉淀物的影响以及不需要压缩空气供应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improving the transfer of dissolved oxygen in a biological Fe2+ oxidation process using a venturi jet as an intensive aeration system

The low bio-production of Fe3+ as a leaching agent is one of the main limitations to implementing industrial bio-processes at feasibility conditions. The main limitation of the bio-oxidation process of Fe2+ is the low oxygen transfer to the aqueous phase because of the low oxygen solubility. This study assesses the effectiveness of the venturi jet as an innovative and intensive aeration device for overcoming the oxygen limitation in a continuous ferrous oxidation process in a fixed-bed reactor with immobilized acidithiobacillus ferrooxidans, in contrast to the conventional diffuser aeration device. Firstly, the influence of the airflow and the influence of the medium concentration were determined for the following parameters for both aeration devices; Volumetric mass transfer coefficient (kLa), Standard Oxygen Transfer Rate (SOTR), Standard Aeration Efficiency (SAE), and Standard Oxygen Transfer Efficiency (SOTE). Then, both aeration devices were compared in a continuous bio-oxidation process in an up-flow packed bio-reactor (UFPB). The system performance was assessed by monitoring temperature, pH, oxidation-reduction potential, and dissolved oxygen concentration for 69 days. Findings displayed that when aerating with the diffuser, the ferrous oxidation rate was restricted by the low dissolved oxygen availability, being about 1 ppm (1 mg L−1). Under these oxygen-limiting conditions, the maximum ferrous (Fe2+) oxidation rate was 9.09 g L−1 h−1. However, when aerating with the venturi jet, the dissolved oxygen concentration increased up to 2.70 mg L−1, achieving a maximum of 29.11 g L−1 h−1. So, this study has demonstrated that the change in the aeration device has resulted in an improvement in the process, achieving a 3.5-fold increase in the oxidation rate. Furthermore, the venturi jet offered additional advantages over the diffuser, such as requiring less power to deliver the same amount of air, being unaffected by jarosite precipitates, and not requiring a supply of compressed air.

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来源期刊
Hydrometallurgy
Hydrometallurgy 工程技术-冶金工程
CiteScore
9.50
自引率
6.40%
发文量
144
审稿时长
3.4 months
期刊介绍: Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.
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