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Fan B, Zhao C, Zhao L, Wang M, Sun N, Li Z, Yang F. Biochar application can enhance phosphorus solubilization by strengthening redox properties of humic reducing microorganisms during composting. BIORESOURCE TECHNOLOGY 2024; 395:130329. [PMID: 38224785 DOI: 10.1016/j.biortech.2024.130329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 12/26/2023] [Accepted: 01/12/2024] [Indexed: 01/17/2024]
Abstract
Phosphorus (P) in nature mostly exists in an insoluble state, and humic reducing microorganisms (HRMs) can dissolve insoluble substances through redox properties. This study aimed to investigate the correlations between insoluble P and dominant HRMs amenable to individual culture during biochar composting. These analyses revealed that, in comparison to the control, biochar addition increased the relative abundance of dominant HRMs by 20.3% and decreased redox potential (Eh) levels by 15.4% hence, enhancing the moderately-labile-P and non-labile-P dissolution. The pathways underlying the observed effects were additionally assessed through structural equation modeling, revealing that biochar addition promoted insoluble P dissolution through both the direct effects of bacterial community structure as well as the direct effects of HRMs community structure and indirect effects based on Eh of HRMs community structure. This research offers a better understanding of the effect of HRMs on insoluble P during the composting process.
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Affiliation(s)
- Bowen Fan
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, China; College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, China; Key Laboratory of Low-carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs, Daqing, Heilongjiang 163319, China; Engineering Research Center of Crop Straw Utilization, Daqing, Heilongjiang 163319, China
| | - Changjiang Zhao
- College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, China; Key Laboratory of Low-carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs, Daqing, Heilongjiang 163319, China; Engineering Research Center of Crop Straw Utilization, Daqing, Heilongjiang 163319, China
| | - Liqin Zhao
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, China
| | - Mengmeng Wang
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, China
| | - Ning Sun
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, China
| | - Zoutong Li
- College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, China; Key Laboratory of Low-carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs, Daqing, Heilongjiang 163319, China; Engineering Research Center of Crop Straw Utilization, Daqing, Heilongjiang 163319, China
| | - Fengjun Yang
- College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing, China.
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Xia X, Teng Y, Zhai Y, Zheng F, Cao X. Influencing factors and mechanism by which DOM in groundwater releases Fe from sediment. CHEMOSPHERE 2022; 300:134524. [PMID: 35398063 DOI: 10.1016/j.chemosphere.2022.134524] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/26/2022] [Accepted: 04/02/2022] [Indexed: 06/14/2023]
Abstract
The groundwater in many aquifers contains elevated concentrations of iron (Fe). Although much of this Fe is from its release from water-bearing sediments under natural environmental conditions, sufficient evidence is lacking to clarify whether anthropogenic pollutants, such as dissolved organic matter (DOM), can increase this natural release. In this time series and comparative analysis study, an Fe increasing effect was verified through laboratory leaching tests. The influences of the aqueous environmental conditions, such as pH, were also investigated. DOM can promote the release of Fe from sediments and increase the concentration of Fe in groundwater. In addition, lower or higher pH and temperature can enhance the release of Fe to some extent. Higher concentrations of DOM provided a more thorough release of Fe from the sediment; additional ions such as Cu also affected Fe release. It is possible that complexation between DOM and Fe occurs through ligand dissolution and reduction, thus promoting the release of Fe. The findings indicate that DOM imported through anthropogenic activities can increase the release of Fe from aquifer sediments into groundwater, thus worsening Fe pollution in groundwater. This study explored the mechanism by which different types of DOM release Fe from aquifer sediments and investigated the factors that influence this process. The findings provide insights into the geochemical processes of Fe in the groundwater.
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Affiliation(s)
- Xuelian Xia
- Engineering Research Center of Groundwater Pollution Control and Remediation of Ministry of Education of China, College of Water Sciences, Beijing Normal University, Beijing, 100875, China
| | - Yanguo Teng
- Engineering Research Center of Groundwater Pollution Control and Remediation of Ministry of Education of China, College of Water Sciences, Beijing Normal University, Beijing, 100875, China.
| | - Yuanzheng Zhai
- Engineering Research Center of Groundwater Pollution Control and Remediation of Ministry of Education of China, College of Water Sciences, Beijing Normal University, Beijing, 100875, China.
| | - Fuxin Zheng
- Engineering Research Center of Groundwater Pollution Control and Remediation of Ministry of Education of China, College of Water Sciences, Beijing Normal University, Beijing, 100875, China
| | - Xinyi Cao
- Engineering Research Center of Groundwater Pollution Control and Remediation of Ministry of Education of China, College of Water Sciences, Beijing Normal University, Beijing, 100875, China
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Xiao Z, Yang L, Chen C, Chen D, Zhou X. Redox reaction between solid-phase humins and Fe(III) compounds: Toward a further understanding of the redox properties of humin and its possible environmental effects. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 310:114793. [PMID: 35220098 DOI: 10.1016/j.jenvman.2022.114793] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 02/12/2022] [Accepted: 02/21/2022] [Indexed: 06/14/2023]
Abstract
Redox reactions between humic substances and Fe(III) compounds play a critical role in the biogeochemical cycle of pollutants. Most humic substances in soils and sediments are in a solid form (i.e. humin (HM)). In order to assess the contribution of electron shuttling via HM within the electron transfer network in natural environments and to predict environmental fate of pollutants associated with iron oxides, it is necessary to understand the electron transfer processes from HM to the environmentally relevant Fe(III) minerals, and to examine the redox reversibility of HM. The results of this study demonstrated that non-reduced HMs could only donate electrons to dissolved ferric citrate and poorly crystalline ferrihydrite, but reduced HMs could also reduce hematite and magnetite that had high crystallinity. The degree of reduction depended on the difference in redox potential and the crystallinity of the Fe(III) compounds. The electron-accepting capacities of different HMs correlated well with their organic carbon content, and quinones and Fe-bound organic component were important electron-accepting groups in HMs. Furthermore, the redox reversibility experiments demonstrated that HMs could maintain stable electron transfer capacities over three reduction-oxidation cycles, indicating that the HM could be an environmentally sustainable electron shuttle. Our results suggest that (1) HM may play an unrecognized and important role in biogeochemical cycles of pollutants in Fe(III) mineral-rich environments; (2) electron shuttling through HM to ferric citrate and ferrihydrite can occur even in the presence of O2; and (3) HM would be a promising material for environmental remediation.
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Affiliation(s)
- Zhixing Xiao
- College of Urban Construction, Nanjing Tech University, Nanjing, 211816, China.
| | - Lizhuang Yang
- College of Urban Construction, Nanjing Tech University, Nanjing, 211816, China
| | - Chuang Chen
- College of Urban Construction, Nanjing Tech University, Nanjing, 211816, China
| | - Dan Chen
- College of Urban Construction, Nanjing Tech University, Nanjing, 211816, China
| | - Xue Zhou
- College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun, 130118, China
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