Nano-Fe3O4/FeCO3 modified red soil-based biofilter for simultaneous removal of nitrate, phosphate and heavy metals: Optimization, microbial community and possible mechanism

IF 12.2 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Journal of Hazardous Materials Pub Date : 2024-11-07 DOI:10.1016/j.jhazmat.2024.136428
Peng Zhang, Liang Xu, Junfeng Su, Yan Liu, Bolin Zhao, Yihan Bai, Xuan Li
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Abstract

The pollution of nitrogen, phosphorus and heavy metals in surface water is becoming more and more serious, affecting the safety of water quality. In this study, three biofilters were constructed using iron-modified red soil-based filler carriers (RSC, nano-Fe3O4@RSC, and FeCO3@RSC) combined with strain Zoogloea sp. ZP7 to simultaneously remove nitrate (NO3--N), phosphate (PO43--P), copper (Cu2+), and zinc (Zn2+). The long-term operation results showed that the three groups of biofilters could remove 85.0, 90.0, and 89.8% of NO3--N, respectively. Furthermore, the addition of iron compounds enhanced the removal of PO43--P and the resistance to the stress of Cu2+ and Zn2+ in the biofilter. The analysis illustrated that iron modification improved the redox activity and zeta potential of RSC surface. The secondary structure analysis of the protein showed that the microbial secreted proteins were more compact on the surface of the iron-modified RSC, which facilitated the formation of biofilm on the carrier surface. In addition, the iron-modified RSC-based biofilter also showed excellent NO3--N and PO43--P removal efficiency in the treatment of actual surface water. The microbial community analysis results showed that Zoogloea became the dominant species in the biofilter. On the other hand, the presence of iron-reducing bacteria and the expression iron cycle-related genes may contribute to denitrification under low nutrient conditions.

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同时去除硝酸盐、磷酸盐和重金属的纳米 Fe3O4/FeCO3 改性红壤生物滤池:优化、微生物群落和可能的机制
地表水中的氮、磷和重金属污染日益严重,影响了水质安全。本研究利用铁改性红壤基填料载体(RSC、纳米Fe3O4@RSC和FeCO3@RSC)与Zoogloea sp.ZP7菌株构建了三组生物滤池,可同时去除硝酸盐(NO3--N)、磷酸盐(PO43--P)、铜(Cu2+)和锌(Zn2+)。长期运行结果表明,三组生物滤池对 NO3-N 的去除率分别为 85.0%、90.0% 和 89.8%。此外,铁化合物的添加提高了生物滤池对 PO43-P 的去除率以及对 Cu2+ 和 Zn2+ 应力的抵抗力。分析表明,铁改性提高了 RSC 表面的氧化还原活性和 zeta 电位。蛋白质的二级结构分析表明,微生物分泌的蛋白质在铁改性的 RSC 表面更加紧密,这有利于在载体表面形成生物膜。此外,基于铁改性 RSC 的生物滤池在实际地表水处理中也表现出优异的 NO3-N 和 PO43-P 去除效率。微生物群落分析结果表明,Zoogloea 是生物滤池中的优势物种。另一方面,铁还原菌的存在和铁循环相关基因的表达可能有助于低营养条件下的反硝化作用。
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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