Exploring the recycling of bioleaching functional bacteria and sulfur substrate using the sulfur-covered biochar particles
Exploring the recycling of bioleaching functional bacteria and sulfur substrate using the sulfur-covered biochar particles
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利用硫包覆生物炭颗粒探索生物浸出功能菌和硫底物的回收利用
DOI：
10.1186/s12302-020-00344-3
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发表时间：
2020-01
影响因子：
5.9
通讯作者：
Liping Lou
中科院分区：
文献类型：
--
作者：
Chuncheng Wu;Mengying Jiang;Zhe Ye;Yuchen Cai;Yutao Shen;Haizhen Wang;Qi Lin;Chaofeng Shen;Baolan Hu;Liping Lou
抽象的。背景生物淋滤作为一种新兴的沉积物重金属污染修复技术，近年来受到广泛关注。但是，使用硫磺粉作为硫基质会产生“后酸化”问题，反应器运行过程中易受环境影响的游离生物淋滤功能菌无法多轮高效利用。若能在生物浸出后同时回收硫基质和生物浸出功能菌，则可解决上述问题。采用一种新型的硫基质--实验室自制的硫包覆生物炭颗粒进行生物浸出实验，并与硫磺粉和硫磺粉与表面活性剂鼠李糖脂的混合物进行比较。结果硫包覆生物炭颗粒具有良好的上级生物淋滤性能，包括更快的酸化速率、SO 42 −生成速率和重金属淋滤速率，以及更高的重金属溶出率（Ni 33.76%; Cu 66.16%; Zn 65.494%），这是由于生物淋滤功能菌固定在生物炭表面加速了生物淋滤反应。另外，硫包覆的生物炭颗粒可以重复使用，其重金属溶解率（Ni 32.84%，Cu 69.93%，Zn 67.17%）与第一轮相当。然而，硫含量成为导致第三轮生物浸出性能差的主要限制因素。硫磺与表面活性剂鼠李糖脂混合后，由于有机质含量高和pH值低的影响，对酸化和重金属的增溶没有明显的促进作用。结论研究表明，实验室制备的硫包覆生物炭颗粒可实现生物沥滤功能菌和硫基质的双重固定化，支持其在第二轮生物沥滤中的回收再利用。在未来的研究中，将探索如何保持硫覆盖的生物炭颗粒的重复使用更多轮。
Abstract. Background. Bioleaching has been attracting attention in the recent years as an emerging sediment heavy metal pollution remediation technology. However, the use of sulfur powder as sulfur substrate causes the problem of “post-acidification”, and the free bioleaching functional bacteria which are susceptible to environmental impact during reactor operation cannot be used efficiently for multiple rounds. These problems can be solved if the sulfur substrate and the bioleaching functional bacteria can be recycled simultaneously after bioleaching. A new kind of sulfur substrate, the laboratory-made sulfur-covered biochar particles, was used in the bioleaching experiment, compared with sulfur powder and sulfur powder mixed with the surfactant rhamnolipid.. Results. The sulfur-covered biochar particles exhibited superior bioleaching performance, including faster acidification rate, SO42− production rate and heavy metal bioleaching rate, and higher heavy metal solubilization percentage (Ni 33.76%; Cu 66.16%; Zn 65.494%), which resulted from the acceleration of bioleaching reaction by the bioleaching functional bacteria immobilized on the biochar surface. Otherwise, the sulfur-covered biochar particles could be reused in the second round, and the heavy metal solubilization percentage (Ni 32.84%, Cu 69.93%, Zn 67.17%) was comparable with that of the first round. Nevertheless, the sulfur content became the main limiting factor causing poor bioleaching performance during the third round. Sulfur mixed with the surfactant rhamnolipid did not show significant effect in promoting acidification and heavy metal solubilization due to high levels of organic matter and the impact of the low pH value.. Conclusion. The research indicated the laboratory-made sulfur-covered biochar particles could realize the dual immobilization of the bioleaching functional bacteria and the sulfur substrate to support their recycling and reuse in the second bioleaching round. In the future research, the way to maintain the reuse of the sulfur-covered biochar particles for more rounds will be explored.
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影响因子：
5.3
作者：
通讯作者：
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通过集成高通量绝对丰度定量评估土壤细菌群落和动态
影响因子：
2.7
作者：
Lou J;Yang L;Wang H;Wu L;Xu J
通讯作者：
Xu J
DOI：
10.1271/bbb1961.35.686
发表时间：
1971-05
期刊：
Agricultural and biological chemistry
影响因子：
--
作者：
Kenichi Hisatsuka;T. Nakahara;N. Sano;Koichi Yamada
通讯作者：
Kenichi Hisatsuka;T. Nakahara;N. Sano;Koichi Yamada
影响因子：
2.2
作者：
JOHNSON, DB
通讯作者：
JOHNSON, DB
影响因子：
11.4
作者：
R. Tichý;A. Janssen;J. Grotenhuis;G. Lettinga;W. Rulkens
通讯作者：
R. Tichý;A. Janssen;J. Grotenhuis;G. Lettinga;W. Rulkens