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Lin Y, Chen Y, Wang H, Yu Y, Wang Y, Ma S, Wang L, Ren H, Xu K. Weak magnetic field promotes denitrification by stimulating ferromagnetic ion-containing metalloprotein expression. WATER RESEARCH 2024; 262:122116. [PMID: 39032337 DOI: 10.1016/j.watres.2024.122116] [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: 04/16/2024] [Revised: 07/09/2024] [Accepted: 07/16/2024] [Indexed: 07/23/2024]
Abstract
Weak magnetic field (WMF) has been recognized to promote biological denitrification processes; however, the underlying mechanisms remain largely unexplored, hindering the optimization of its effectiveness. Here, we systematically investigated the effects of WMF on denitrification performance, enzyme activity, microbial community, and metaproteome in packed bed bioreactors treating high nitrate wastewater under different WMF intensities and C:N ratios. Results showed that WMFs significantly promoted denitrification by consistently stimulating the activities of denitrifying reductases and NAD+/NADH biosynthesis across decreasing C:N ratios. Reductases and electron transfer enzymes involved in denitrification were overproduced due to the significantly enriched overexpression of ferromagnetic ion-containing (FIC) metalloproteins. We also observed WMFs' intensity-dependent selective pressure on microbial community structures despite the effects being limited compared to those caused by changing C:N ratios. By coupling genome-centric metaproteomics and structure prediction, we found the dominant denitrifier, Halomonas, was outcompeted by Pseudomonas and Azoarcus under WMFs, likely due to its structural deficiencies in iron uptake, suggesting that advantageous ferromagnetic ion acquisition capacity was necessary to satisfy the substrate demand for FIC metalloprotein overproduction. This study advances our understanding of the biomagnetic effects in the context of complex communities and highlights WMF's potential for manipulating FIC protein-associated metabolism and fine-tuning community structure.
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Affiliation(s)
- Yuan Lin
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, N.O.163, Xianlin Avenue, Nanjing, Jiangsu 210023, PR China
| | - Yanting Chen
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, N.O.163, Xianlin Avenue, Nanjing, Jiangsu 210023, PR China
| | - Haiyue Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, N.O.163, Xianlin Avenue, Nanjing, Jiangsu 210023, PR China
| | - Yuexin Yu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, N.O.163, Xianlin Avenue, Nanjing, Jiangsu 210023, PR China
| | - Yanru Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, N.O.163, Xianlin Avenue, Nanjing, Jiangsu 210023, PR China
| | - Sijia Ma
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, N.O.163, Xianlin Avenue, Nanjing, Jiangsu 210023, PR China
| | - Laichun Wang
- Yixing Environmental Research Institute of Nanjing University, Yixing, 214200, Jiangsu, PR China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, N.O.163, Xianlin Avenue, Nanjing, Jiangsu 210023, PR China
| | - Ke Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, N.O.163, Xianlin Avenue, Nanjing, Jiangsu 210023, PR China.
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Xing W, Zhou G, Gao D, Zhang Z, Li L, Zheng W, Yao H. Carbon dioxide and weak magnetic field enhance iron-carbon micro-electrolysis combined autotrophic denitrification. BIORESOURCE TECHNOLOGY 2024; 406:131015. [PMID: 38906196 DOI: 10.1016/j.biortech.2024.131015] [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: 04/15/2024] [Revised: 06/17/2024] [Accepted: 06/18/2024] [Indexed: 06/23/2024]
Abstract
Combining iron-carbon micro-electrolysis and autotrophic denitrification is promising for nitrate removal from wastewater. In this study, four continuous reactors were constructed using CO2 and weak magnetic field (WMF) to address challenges like iron passivation and pH stability. In the reactors with CO2 + WMF (10 and 35 mT), the increase in total nitrogen removal efficiency was significantly higher (96.2 ± 1.6 % and 94.1 ± 2.7 %, respectively) than that of the control (51.6 ± 2.7 %), and Fe3O4 converted to low-density FeO(OH) and FeCO3, preventing passivation film formation. The WMF application decreased the N2O emissions flux by 8.7 % and 20.5 %, respectively. With CO2 + WMF, the relative enzyme activity and abundance of denitrifying bacteria, especially unclassified_Rhodocyclaceae and Denitratisoma, increased. Thus, this study demonstrates that CO2 and WMF optimize the nitrate removal process, significantly enhancing removal efficiency, reducing greenhouse gas emissions, and improving process stability.
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Affiliation(s)
- Wei Xing
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, PR China; Tangshan Research Institute of Beijing Jiaotong University, Hebei 063000, PR China.
| | - Guangxin Zhou
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, PR China
| | - Daoqing Gao
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, PR China; China Institute of Marine Technology and Economy, Beijing 100081, PR China
| | - Zexi Zhang
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, PR China
| | - Longsheng Li
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, PR China
| | - Weijia Zheng
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, PR China
| | - Hong Yao
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, PR China; Tangshan Research Institute of Beijing Jiaotong University, Hebei 063000, PR China.
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Luan YN, Yin Y, Guo Z, Yang J, Wang G, Zhang F, Xiao Y, Liu C. Achieving simultaneous nitrification and endogenous denitrifying phosphorus removal in anaerobic/intermittently-aerated moving bed biofilm reactor for low carbon-to-nitrogen ratio wastewater treatment. BIORESOURCE TECHNOLOGY 2024; 394:130178. [PMID: 38072080 DOI: 10.1016/j.biortech.2023.130178] [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: 10/29/2023] [Revised: 12/05/2023] [Accepted: 12/06/2023] [Indexed: 02/04/2024]
Abstract
In this study, an anaerobic/intermittently-aerated moving bed biofilm reactor (AnIA-MBBR) was proposed to realize simultaneous nitrification and endogenous denitrifying phosphorus removal (SNEDPR) in treating low carbon-to-nitrogen (C/N) ratio wastewater. The effect of different intermittent aeration modes (short and long aeration) on nutrients' removal was investigated. With the C/N ratio around 3, the removal efficiencies of total nitrogen and phosphorus were 90% and 74%, 88% and 59%, respectively, for short aeration and long aeration. The different aeration time also altered the nutrients' degradation pathway, biofilm characteristics, microbial community, and functional metabolic pathways. The results confirmed the occurrence of aerobic denitrifiers, anoxic denitrifiers, phosphorus accumulating organisms, glycogen accumulating organisms in AnIA-MBBR systems and their synergistic performance induced the SNEDPR. These results indicated that the application of AnIA in MBBR systems was an effective strategy to achieve SNEDPR, providing better simultaneous removal performance of nitrogen and phosphorus from low C/N ratio wastewater.
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Affiliation(s)
- Ya-Nan Luan
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
| | - Yue Yin
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
| | - Zhonghong Guo
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
| | - Jiaqi Yang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
| | - Guanglei Wang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
| | - Feng Zhang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
| | - Yihua Xiao
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
| | - Changqing Liu
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China.
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Chen J, Ma S, Wang H, Wang Y, Ren H, Xu K. Weak magnetic carriers reduce nitrite accumulation and boost denitrification at high nitrate concentrations by enriching functional bacteria and enhancing electron transfer. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 351:119734. [PMID: 38071915 DOI: 10.1016/j.jenvman.2023.119734] [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: 09/11/2023] [Revised: 11/19/2023] [Accepted: 11/26/2023] [Indexed: 01/14/2024]
Abstract
Biological denitrification is the dominant method for NO3- removal from wastewater, while high NO3- leads to NO2- accumulation and inhibits denitrification performance. In this study, different weak magnetic carriers (0, 0.3, 0.6, 0.9 mT) were used to enhance biological denitrification at NO3- of 50-2400 mg/L. The effect of magnetic carriers on the removal and mechanism of denitrification of high NO3- was investigated. The results showed that 0.6 and 0.9 mT carriers significantly enhanced the TN removal efficiency (>99%) and reduced the accumulation of NO2- (by > 97%) at NO3- of 1200-2400 mg/L 0.6 and 0.9 mT carriers stimulated microbial electron transport by improving the abundances of coenzyme Q-cytochrome C reductase (by 4.44-23.30%) and cytochrome C (by 2.90-16.77%), which contributed to the enhanced elimination of NO3- and NO2-. 0.6 and 0.9 mT carriers increased the activities of NAR (by 3.74-37.59%) and NIR (by 5.01-8.24%). The abundance of narG genes in 0.6 and 0.9 mT was 1.47-2.35 and 1.38-1.75 times that of R1, respectively, and the abundance of nirS genes was 1.49-2.83 and 1.55-2.39 times that of R1, respectively. Denitrifying microorganisms, e.g., Halomonas, Thauera and Pseudomonas were enriched at 0.6 and 0.9 mT carriers, which benefited to the advanced denitrification performance. This study suggests that weak magnetic carriers can help to enhance the biological denitrification of high NO3- wastewater.
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Affiliation(s)
- Jiahui Chen
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Sijia Ma
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Haiyue Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Yanru Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China
| | - Ke Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, PR China.
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Wang M, Xu Z, Huang Y, Dong B. Static magnetic field enhances Cladosporium sp. XM01 growth and fungal Mn(II) oxidation. JOURNAL OF HAZARDOUS MATERIALS 2022; 437:129332. [PMID: 35752045 DOI: 10.1016/j.jhazmat.2022.129332] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 05/28/2022] [Accepted: 06/07/2022] [Indexed: 06/15/2023]
Abstract
Fungal Mn oxidation is a crucial pathway in the biogeochemical cycling of toxic substances. However, few studies have aimed to promote the process of fungal Mn oxidation or systematically establish the mechanism of action. The effects of static magnetic field (SMF) treatment on the growth and Mn(II) oxidation capability of an Mn-oxidizing fungus, Cladosporium sp. XM01, were investigated. Results showed that 20.1 mT SMF treatment promoted the growth of strain XM01, and increased the Mn(II) removal rate by accelerating the adsorption and oxidation of Mn(II). In addition, the results of RNA sequencing suggested that SMF mainly stimulated energy metabolism and protein synthesis, accelerating the growth of strain XM01. Notably, KEGG pathway enrichment analysis found that SMF treatment significantly up-regulated the pathway of oxidative phosphorylation system, which is capable of stimulating the generation of superoxide (O2•-). Moreover, exposure to 20.1 mT SMF significantly promoted the activities of antioxidant enzymes including SOD and CAT. These results indicate that SMF treatment stimulates the generation of O2•- by strain XM01, and therefore, accelerates Mn(II) oxidation. This is a novel study using external SMF treatment to enhance fungal Mn(II) oxidation.
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Affiliation(s)
- Mei Wang
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil and Water Pollution, College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, Sichuan, China
| | - Zuxin Xu
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
| | - Yangrui Huang
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Bin Dong
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
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