Liang Enlei, Xu Liang, Su Junfeng, Liu Yan, Qi Shangzhe, Li Xuan
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Bioresour Technol. 2023 Nov;387:129604. doi: 10.1016/j.biortech.2023.129604. Epub 2023 Aug 6.
Mixed pollutant wastewater has been a difficult problem due to the high toxicity of water bodies and the difficulty of treatment. Rice husk biochar modified with nano-iron tetroxide (RBC-nFeO) by polyvinyl alcohol cross-linking internal doping was used to introduce iron-reducing bacteria Klebsiella sp. FC61 to construct a bioreactor. The results of the long-term operation of the bioreactor showed that the removal efficiency of ammonia nitrogen (NH-N) and chemical oxygen demand best reached 90.18 and 98.49%, respectively. In addition, in the co-presence of Ni, Cd, and ciprofloxacin, the bioreactor was still able to remove pollutants efficiently by RBC-nFeO and bio-iron precipitation inside the biocarrier. During the long-term operation, Klebsiella was always the dominant species in the bioreactor. And the sequencing data for functional prediction showed that the biocarrier contained a variety of enzymes and proteins involved in Feammox-related activities to ensure the stable and efficient operation of the bioreactor.
由于水体毒性高和处理困难，混合污染物废水一直是个难题。通过聚乙烯醇交联内掺杂用纳米四氧化三铁改性的稻壳生物炭（RBC-nFeO）被用于引入铁还原菌克雷伯氏菌属FC61以构建生物反应器。生物反应器长期运行的结果表明，氨氮（NH-N）和化学需氧量的去除效率分别最佳达到90.18%和98.49%。此外，在镍、镉和环丙沙星共存的情况下，生物反应器仍能够通过生物载体内部的RBC-nFeO和生物铁沉淀有效地去除污染物。在长期运行过程中，克雷伯氏菌一直是生物反应器中的优势菌种。并且功能预测的测序数据表明，生物载体含有多种参与厌氧氨氧化相关活动的酶和蛋白质，以确保生物反应器的稳定高效运行。
