Enhanced effect of biochar on leaching vanadium and copper from stone coal tailings by Thiobacillus ferrooxidans

IF 5.8 3区环境科学与生态学 0 ENVIRONMENTAL SCIENCES

Environmental Science and Pollution Research Pub Date : 2021-11-04 DOI:10.1007/s11356-021-17259-y

Yingbo Dong, Shijia Chong, Hai Lin

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引用次数: 10

Abstract

Among the many extraction technologies for recovering metal resources from tailings, bioleaching technology is gradually showing its momentum. In our research, the enhanced effect of biochar on the bioleaching of stone coal tailings by Thiobacillus ferrooxidans (T. ferrooxidans) has been explored. In the static bioleaching experiment for 10 days, the leaching rate of vanadium (V) and copper (Cu) increased by 26.8% and 21.0% respectively after adding 5 g/L biochar. The dynamic bioleaching experiment further verified that under the promotion of biochar, the 44 day cumulative leaching rate of V and Cu increased by 15.3% and 14.5%, respectively. The promoting effect of biochar on T. ferrooxidans was mainly reflected in two aspects. The unique porous structure of biochar created a microenvironment for free microorganisms for inhabitation, while storing abundant nutrients. Biochar can also act as an excellent electronic medium to promote electron transfer, improving the oxidation ability of T. ferrooxidans on Fe²⁺. Furthermore, the presence of biochar may effectively inhibit the formation of jarosite precipitation on tailings in bioleaching, thereby improving the dissolution of tailings and the release of metal elements. This study demonstrates that biochar-enhanced bioleaching may be an efficient and environmentally friendly method for recovering metal resources from tailings.

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生物炭对氧化亚铁硫杆菌浸出石煤尾矿中钒、铜的强化作用

在众多从尾矿中回收金属资源的提取技术中，生物浸出技术正逐渐显示出其发展势头。本研究探讨了生物炭对氧化亚铁硫杆菌(T. ferrooxidans)浸出石煤尾矿的强化作用。在10 d的静态生物浸出试验中，添加5 g/L生物炭后，钒(V)和铜(Cu)的浸出率分别提高了26.8%和21.0%。动态生物浸出试验进一步验证，在生物炭的促进下，V和Cu的44 d累积浸出率分别提高了15.3%和14.5%。生物炭对氧化亚铁杆菌的促进作用主要体现在两个方面。生物炭独特的多孔结构为游离微生物的生存创造了微环境，同时储存了丰富的营养物质。生物炭还可以作为优良的电子介质促进电子传递，提高T. ferrooxidans对Fe2+的氧化能力。此外，生物炭的存在可以有效抑制生物浸出过程中尾矿上黄铁矾沉淀的形成，从而促进尾矿的溶解和金属元素的释放。该研究表明，生物炭强化生物浸出可能是一种高效、环保的尾矿金属资源回收方法。

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来源期刊

Environmental Science and Pollution Research 环境科学-环境科学

CiteScore

8.70

自引率

17.20%

发文量

6549

审稿时长

3.8 months

期刊介绍： Environmental Science and Pollution Research (ESPR) serves the international community in all areas of Environmental Science and related subjects with emphasis on chemical compounds. This includes: - Terrestrial Biology and Ecology - Aquatic Biology and Ecology - Atmospheric Chemistry - Environmental Microbiology/Biobased Energy Sources - Phytoremediation and Ecosystem Restoration - Environmental Analyses and Monitoring - Assessment of Risks and Interactions of Pollutants in the Environment - Conservation Biology and Sustainable Agriculture - Impact of Chemicals/Pollutants on Human and Animal Health It reports from a broad interdisciplinary outlook.