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Usage of microbial combination degradation technology for the remediation of uranium contaminated ryegrass
Environment International ( IF 10.3 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.envint.2020.106051 Luhuai Jing 1 , Xianghui Zhang 1 , Imran Ali 2 , Xiaoming Chen 1 , Li Wang 3 , Hao Chen 4 , Mengwei Han 5 , Ran Shang 5 , Yuewen Wu 6
Environment International ( IF 10.3 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.envint.2020.106051 Luhuai Jing 1 , Xianghui Zhang 1 , Imran Ali 2 , Xiaoming Chen 1 , Li Wang 3 , Hao Chen 4 , Mengwei Han 5 , Ran Shang 5 , Yuewen Wu 6
Affiliation
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Post phytoremediation accumulation of heavy metals in plants is causing an environmental issue worldwide. In this study, we investigated the ability of eight different kinds of microorganisms to degrade and release heavy metals from heavy metal enriched ryegrass, including 5 species of bacteria (, , -I, -II and ) and 3 of fungi (, and sp. strain QD-1), by growing them under uranium stress and assessing their ability to degrade biomass. After 30 days, the degradation ability of fungi was found better than that of bacteria, while the metal leaching ability of bacteria was found better. The highest degradation rate (upto 60%) was obtained by using , sp. strain QD-1 exhibited the best leaching rate for uranium (upto 77%). The overall degradation rate of lignin and cellulose and hemicellulose was found lower (40% and 60%, respectively). According to the antagonistic characteristics of microbes, we combined different dominant species, in which under optimal conditions the T2 combination (, , and sp. strain QD-1 and ) was able to degrade 80% of the ryegrass, 51% of lignin, 74% of cellulose and hemicellulose, releasing 78% of U, 90% of Pb and the releasing rate of other heavy metals was more than 95%. FTIR analysis showed the least degradation of lignin, while SEM-EDX analysis of the degradation residues displayed the microstructure of ryegrass being greatly damaged. Only a small amount of U was found in the residues of the researched combinations. This study provides efficient Microbial Combined Degradation Technology for heavy metal enriched biomass, which can effectively deal with heavy metal enriched plants, and provide a basis for the recovery and utilization of heavy metals, avoiding secondary pollution in the environment caused by this type of biomass.
中文翻译：
微生物组合降解技术修复铀污染黑麦草
植物修复后植物中重金属的积累正在引起世界范围内的环境问题。在本研究中，我们研究了八种不同微生物从富含重金属的黑麦草中降解和释放重金属的能力，其中包括 5 种细菌（、、-I、-II 和 ）和 3 种真菌（和 sp.菌株 QD-1），通过在铀胁迫下生长它们并评估它们降解生物量的能力。 30天后，发现真菌的降解能力优于细菌，而细菌的金属浸出能力更好。使用 , sp 获得了最高的降解率（高达 60%）。菌株QD-1表现出最好的铀浸出率（高达77%）。发现木质素、纤维素和半纤维素的总体降解率较低（分别为 40% 和 60%）。根据微生物的拮抗特性，我们将不同的优势种进行组合，其中在最佳条件下，T2组合（菌株QD-1和菌株）能够降解80%的黑麦草、51%的木质素、74 ％的纤维素和半纤维素，释放78％的U，90％的Pb，其他重金属释放率大于95％。 FTIR分析显示木质素降解最少，而SEM-EDX对降解残留物的分析显示黑麦草的微观结构受到极大破坏。在所研究的组合的残留物中只发现了少量的U。本研究为重金属富集生物质提供了高效的微生物联合降解技术，可以有效处理重金属富集植物，为重金属的回收利用提供基础，避免此类生物质对环境造成二次污染。
更新日期：2020-09-01
中文翻译：
微生物组合降解技术修复铀污染黑麦草
植物修复后植物中重金属的积累正在引起世界范围内的环境问题。在本研究中，我们研究了八种不同微生物从富含重金属的黑麦草中降解和释放重金属的能力，其中包括 5 种细菌（、、-I、-II 和 ）和 3 种真菌（和 sp.菌株 QD-1），通过在铀胁迫下生长它们并评估它们降解生物量的能力。 30天后，发现真菌的降解能力优于细菌，而细菌的金属浸出能力更好。使用 , sp 获得了最高的降解率（高达 60%）。菌株QD-1表现出最好的铀浸出率（高达77%）。发现木质素、纤维素和半纤维素的总体降解率较低（分别为 40% 和 60%）。根据微生物的拮抗特性，我们将不同的优势种进行组合，其中在最佳条件下，T2组合（菌株QD-1和菌株）能够降解80%的黑麦草、51%的木质素、74 ％的纤维素和半纤维素，释放78％的U，90％的Pb，其他重金属释放率大于95％。 FTIR分析显示木质素降解最少，而SEM-EDX对降解残留物的分析显示黑麦草的微观结构受到极大破坏。在所研究的组合的残留物中只发现了少量的U。本研究为重金属富集生物质提供了高效的微生物联合降解技术，可以有效处理重金属富集植物，为重金属的回收利用提供基础，避免此类生物质对环境造成二次污染。
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