Environmental Research最新文献

{"title":"Phytoremediation strategies for the reclamation of tailings and mining soils in an active open-pit site","authors":"Ana María Díaz ,&nbsp;Rubén Forján ,&nbsp;José Luis R. Gallego ,&nbsp;Lucía Benavente-Hidalgo ,&nbsp;Alicia Sánchez-Poyal ,&nbsp;Pamela Díaz-García ,&nbsp;J.M. Menéndez-Aguado ,&nbsp;Diego Baragaño","doi":"10.1016/j.envres.2025.121464","DOIUrl":"10.1016/j.envres.2025.121464","url":null,"abstract":"<div><div>This study evaluated two phytoremediation strategies at an active open-pit mining site within a dunite deposit, an ultramafic igneous rock rich in nickel. The strategies included phytostabilization for tailings, which are fine fractions resulting from rock processing, and phytoextraction for mining soil, composed of natural soil aggregates mixed with fine dunite fragments. Tailings had an alkaline pH (8.8), low organic matter content (9.4 g kg⁻¹), and high available Ni concentrations, requiring immobilization using compost, vermicompost, biochar, and vermichar. These amendments were tested in 1-kg pots over 180 days, assessing soil properties, plant growth, and Ni accumulation in <em>Lolium perenne</em> L. In contrast, mining soil showing a more neutral pH (7.6), higher organic matter (106 g kg⁻¹), and also high available Ni contents, underwent phytoextraction supported by EDTA and citric acid in a parallel experiment.</div><div>Phytostabilization with compost, vermicompost, and vermichar significantly reduced available Ni (&lt;5 mg kg⁻¹), improved plant growth, and increased labile carbon, whereas biochar was less effective. Vermicompost proved particularly beneficial, enhancing nutrient and carbon availability, minimizing Ni leaching, and preventing excessive accumulation in plant aerial parts. Meanwhile, phytoextraction was successfully implemented without altering soil properties, with EDTA boosting Ni accumulation in aerial biomass up to 400 mg kg⁻¹, outperforming citric acid.</div><div>These findings highlight the adaptability of phytoremediation, demonstrating the successful application of both strategies in the same environment, with <em>Lolium perenne</em> L. functioning either as a metal accumulator or a phytostabilizing plant depending on the amendments used.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"275 ","pages":"Article 121464"},"PeriodicalIF":7.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143699286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of biofertilizers on nonsymbiotic nitrogen fixation in different paddy soils","authors":"Qiong Xu ,&nbsp;Mengyuan Hu ,&nbsp;Shengwen Xu ,&nbsp;Stanley Chukwuemeka Ihenetu ,&nbsp;Xunqi Chen ,&nbsp;Yaying Li ,&nbsp;Huaiying Yao","doi":"10.1016/j.envres.2025.121416","DOIUrl":"10.1016/j.envres.2025.121416","url":null,"abstract":"<div><div>The excessive application of chemical nitrogen fertilizers to paddy fields has led to numerous environmental problems. Nitrogen-fixing biofertilizers are adequate substitutes for chemical nitrogen fertilizers. In this study, two representative paddy soils (HH and SH) in China with significant differences in their nitrogen fixation activities and physicochemical properties were selected. The effects of 11 kinds of commercial nitrogen-fixing biofertilizers on the properties, nonsymbiotic biological nitrogen fixation activities and <em>nifH</em> gene abundance of the soil were assessed. The results revealed that different biofertilizers exerted distinct effects on the biological nitrogen fixation (BNF) rate and <em>nifH</em> gene abundance of these soils. The BNF rates of HH soil and SH soil ranged from 10.35 to 21.95 μg kg⁻¹·d⁻¹ and from 2.53 to 35.27 μg kg⁻¹·d⁻¹, respectively. The highest increase in BNF was 80.87 % in HH soils and more than tenfold in SH soils. Mo is a component of nitrogen-fixing enzymes, and the results showed that Mo content was positively correlated with the rate of nitrogen fixation in SH soils, which was the most important factor affecting the rate of nitrogen fixation. Application of biofertilizers with high Mo content in Mo-deficient paddy soils may be an effective measure to increase soil N input. The size of the nitrogen-fixing strain population in the 11 biofertilizers ranged from 2.6 × 10³ to 1.2 × 10⁸ CFU g⁻¹, and 32 strains were identified by 16S rRNA gene sequencing. Strains B4 (<em>Pantoea wallisii</em>), B5 (<em>Pantoea anthophila</em>), and B8 (<em>Bacillus paralicheniformis</em>) had the highest BNF rates in nitrogen-free medium. This study elucidated the contributions of various commercial biofertilizers to nonsymbiotic nitrogen fixation in paddy soils and revealed the underlying mechanisms. These findings provide a theoretical foundation for the development and practical application of biofertilizers, and will inform strategies to increase the efficacy of biofertilizers in agricultural settings.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"275 ","pages":"Article 121416"},"PeriodicalIF":7.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143690661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Forest mycorrhizal types mediated environmental controls on global particulate and mineral-associated organic matter storage","authors":"Luping Ma ,&nbsp;Zhaoyong Shi ,&nbsp;Manman Jing ,&nbsp;Jiakai Gao ,&nbsp;Shanwei Wu ,&nbsp;Shuangshuang Wang","doi":"10.1016/j.envres.2025.121459","DOIUrl":"10.1016/j.envres.2025.121459","url":null,"abstract":"<div><div>Most trees associate with arbuscular mycorrhizal (AM) or ectomycorrhizal (ECM) fungi, which increases the input to soil carbon pools. Identifying the regulatory mechanisms of mycorrhizal fungi on environmentally controlled global forest total SOM storage is crucial for understanding the global carbon cycle and addressing climate change. Currently, we lack a comprehensive understanding of how mycorrhizae regulate forest total SOM storage, especially regarding POM and MAOM. This study is based on published data and aims to elucidate the regulatory role of different mycorrhizal types on environmentally controlled POM and MAOM storage by analyzing data from 81 AM to 124 ECM forest sites worldwide. The dataset included 718 sets of organic matter fractions (POM, MAOM, total SOM), climate factors (MAT, MAP-PET), soil factors (pH, sand, silt, clay), and matter inputs (i.e., net primary production [NPP]). We used variance partitioning analysis (VPA), stochastic gradient boosting, and path analysis in R to assess the relative importance of these variables. Significant differences in total SOM storage between AM and ECM forests were found, primarily due to variations in MAOM storage. AM forests store more MAOM (8.41 g C kg⁻¹ soil) and total SOM (8.20 g C kg⁻¹ soil) than ECM forests. In ECM forests, climate and soil explained a higher proportion of variation in POM, MAOM, and total SOM storage (40.06–46.70 %) compared to AM forests (17.56–31.20 %). Further analysis indicates that MAOM storage in AM forests is strongly influenced by Clay (21.90 %) and NPP (20.20 %), whereas in ECM forests, it is predominantly affected by MAT (42.90 %) and MAP-PET (23.90 %). In global forest ecosystems, climate and soil are the primary controlling factors, with different mycorrhizal types mediating variations in POM and MAOM storage, which in turn indirectly affect total SOM storage.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"275 ","pages":"Article 121459"},"PeriodicalIF":7.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143690664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photogenerated electron transfer in Ni/NiO supported on g-C3N4 enables sustainable catalytic activation of peroxymonosulfate for emerging pollutant removal","authors":"Runqi Li ,&nbsp;Zhang Liu ,&nbsp;Jingjun Qin ,&nbsp;Kaichun Lin ,&nbsp;Weicheng Xu ,&nbsp;Meng Li ,&nbsp;King Lun Yeung ,&nbsp;Ximiao Zhu ,&nbsp;Jianzhang Fang ,&nbsp;Guangying Zhou ,&nbsp;Zhanqiang Fang","doi":"10.1016/j.envres.2025.121460","DOIUrl":"10.1016/j.envres.2025.121460","url":null,"abstract":"<div><div>Emerging pollutants such as enrofloxacin (ENR), a widely used fluoroquinolone antibiotic, pose significant threats to aquatic ecosystems due to their persistence, bioaccumulation, and toxicity. This study reports the development of a stable and efficient Ni-NiO/g-C₃N₄ heterojunction photocatalyst for ENR degradation under visible light and in the presence of peroxymonosulfate (PMS). The catalyst, synthesized via a templated self-assembly and hydrothermal method, achieved 98.7 % ENR removal within 45 min. Mechanistic studies revealed that the charge transfer along lower energy bands in ternary heterojunctions enhances charge separation and promotes the generation of reactive oxygen species (ROS), including sulfate radicals (SO₄^•–), hydroxyl radicals (•OH), and singlet oxygen (¹O₂). Density functional theory calculations confirmed strong PMS adsorption on the heterojunction of metallic Ni and exposed Ni in NiO, facilitating efficient ROS production and bond polarization for pollutant degradation. The catalyst exhibited remarkable structural stability, maintaining consistent performance over six reuse cycles, attributed to the robust g-C₃N₄ matrix and dynamic redox cycling of Ni/NiO. Toxicity assessments showed significant detoxification of ENR into less harmful byproducts, emphasizing the environmental safety of the process. This work demonstrates the potential of the Ni-NiO/g-C₃N₄/PMS system as a sustainable and scalable approach to address the challenges posed by emerging pollutants in aquatic environments. The research highlights the significance of integrating photocatalysis and PMS activation for advanced oxidation processes, offering an effective pathway to mitigate antibiotic pollution and its ecological impact and can contribute to the development of next-generation catalysts for environmental remediation.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"275 ","pages":"Article 121460"},"PeriodicalIF":7.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143699285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of spatially varying relationships between cadmium accumulation and potential controlling factors in the topsoil of island of Ireland based on spatial machine learning approaches","authors":"Haofan Xu ,&nbsp;Hailong Wang ,&nbsp;Peter Croot ,&nbsp;Juan Liu ,&nbsp;Yunfan Li ,&nbsp;Jingzi Beiyuan ,&nbsp;Cheng Li ,&nbsp;Bhupinder Pal Singh ,&nbsp;Shaowen Xie ,&nbsp;Hongyi Zhou ,&nbsp;Chaosheng Zhang","doi":"10.1016/j.envres.2025.121466","DOIUrl":"10.1016/j.envres.2025.121466","url":null,"abstract":"<div><h3>Background</h3><div>Cadmium (Cd) contamination in soils is a pressing environmental issue due to its toxicity and persistence. Given the diverse geological formations and intensive agricultural activities in Ireland, understanding the distribution and sources of soil Cd is particularly important.</div></div><div><h3>Methods</h3><div>This study used multiple GIS-based and spatial machine learning (SML) techniques to investigate the spatial distribution and controlling factors of Cd in 16,783 topsoil samples across the island of Ireland. Three analytical methods were applied: hot spot analysis to detect clusters of high and low Cd concentrations, Geographically Weighted Pearson Correlation Coefficients (GWPCC) to explore how Cd relationships with other soil properties vary across space, and Random Forest (RF) to rank the contributing factors in Cd accumulation.</div></div><div><h3>Results</h3><div>Hot spot analysis revealed strong spatial overlap between Cd concentrations and key geochemical variables including CIA, Fe, P, pH, SOC, and Zn. GWPCC further highlighted their spatially varying relationships, with significantly strong positive correlations between Cd and pH, Zn, and P in the central midlands. The local correlation coefficients obtained from the GWPCC ranged from negative to the highest values of 0.80, 0.92 and 0.86, respectively, which were significantly higher than the results of traditional Pearson correlation coefficients. These patterns were associated with impure limestones, Zn mineralization, and phosphate fertilizer inputs. Furthermore, the RF model ranked Zn (39.4 %) and P (17.6 %) as the most influential factors, with their importance increasing in limestone-dominated areas (50.9 % and 27.4 %), which emphasized the external contributions from local Zn mineralization and phosphate fertilizers in addition to natural accumulation.</div></div><div><h3>Conclusion</h3><div>This study demonstrated the effectiveness of integrating SML techniques with geochemical analysis for identifying Cd sources in the topsoil of Ireland, highlighting the roles of lithology and agricultural activities in Cd accumulation. The results provided valuable insights for contamination management and environmental policy development in Ireland and elsewhere.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"275 ","pages":"Article 121466"},"PeriodicalIF":7.7,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transport of cyclic volatile methylsiloxanes in residence due to the use of personal care products","authors":"Ruixiu Jiang ,&nbsp;Rui Zhang ,&nbsp;Haimei Wang ,&nbsp;Jianyin Xiong","doi":"10.1016/j.envres.2025.121457","DOIUrl":"10.1016/j.envres.2025.121457","url":null,"abstract":"<div><div>Emissions of cyclic volatile methylsiloxanes (cVMS) due to the use of personal care products pose adverse effect on indoor air quality. We make the first attempt to explore the emission characteristics of decamethylcyclopentasiloxane (D5, the most abundant cVMS) in an occupied residence via modelling and experimental approaches. A mass transfer model for characterizing the emissions of D5 from human skin lipids is developed, which incorporates the adsorption/desorption effect of D5 onto indoor surfaces that was ignored previously. A long-term field campaign in residence was conducted to examine the D5 emission behaviors, showing a number of concentration peaks after using personal care products. Special enhanced-ventilation and emission experiments were designed to determine the mass transfer parameters in the model via a hybrid optimization method, which were then used to predict D5 concentrations in some other test days. Good agreement between model predictions and observations demonstrates the effectiveness of the model and measured parameters. Feature importance analysis on indoor D5 transport is further performed, indicating that air exchange rate is the most important factor compared with temperature and relative humidity. This study comprehensively uncovers the transport dynamics of D5 in realistic indoor settings, which is helpful for human-related source characterization and control.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"275 ","pages":"Article 121457"},"PeriodicalIF":7.7,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143690749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How hydrodynamic conditions dominate the microplastic footprint in the largest freshwater lake in China","authors":"Jingwei Chen ,&nbsp;Hua Wang ,&nbsp;Yanqing Deng ,&nbsp;Xiaomao Wu ,&nbsp;Dongfang Liang ,&nbsp;Yichuan Zeng ,&nbsp;Haosen Xu","doi":"10.1016/j.envres.2025.121456","DOIUrl":"10.1016/j.envres.2025.121456","url":null,"abstract":"<div><div>Understanding the migration and diffusion process of microplastics (MPs) in lakes is of great significance to the cumulative assessment of controlling land-based MP pollution. The MPs in the surface water of Poyang Lake were identified to be mainly composed of three representative particles (&gt;91 %): polyethylene (PE) fiber, polypropylene (PP) fragment and PE film, and this study explored the migration process of different types of MPs in three flow regimes. The results show that MP particles migrate northward under the gravity flow and jacking flow. The average time required for MPs to reach the northern lakes in jacking flow was 21.29 % shorter than that in gravity flow. Instead, MPs undergo reverse movement driven by back flow. The difference in migration rates due to MPs physical properties can reach up to 36 % in the same flow regime. The average concentration of PE fiber in the lake area is 30.61 % and 68.68 % higher than both, PP fragment and PE film. In addition, the accumulation hotspots of MPs under three flow regimes were investigated, and MP monitoring in the corresponding areas based on the flow regime can effectively reduce the ecological risk. In terms of ecological risk, the PLI reached Level IV in hotspot areas, indicating severe ecological risk. If considering that the MP type of Poyang Lake is dominated by PE and PP, only the PSL of the Hukou area reaches level II. This study provides reference and warning for tracking the paths and risks of land-based MPs entering freshwater lakes.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"275 ","pages":"Article 121456"},"PeriodicalIF":7.7,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143690668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nutrients and metal(loid)s in surface sediments of the Chishui River: A DGT-based assessment of the last natural tributary of the upper Yangtze River (China)","authors":"Wei Xia ,&nbsp;Tian-Xin Zhang ,&nbsp;Xue Li ,&nbsp;Yanpeng Gao ,&nbsp;Richard W. Jordan ,&nbsp;Hong Su ,&nbsp;Shi-Jun Jiang ,&nbsp;Yang-Guang Gu","doi":"10.1016/j.envres.2025.121455","DOIUrl":"10.1016/j.envres.2025.121455","url":null,"abstract":"<div><div>This study investigates the distribution and probabilistic ecotoxicological risk assessment of nutrients and metal(loid)s in the Chishui River, the last natural tributary of the upper Yangtze River, which plays a crucial role in maintaining regional biodiversity and water quality. Understanding the impact of contaminants in this ecologically significant river is essential for effective environmental management. Sediment samples were analyzed using diffusive gradients in thin films (DGT) to measure labile concentrations of nutrients and metal(loid)s, revealing significant spatial variability. Concentrations of PO₄-P, NH₄-N, NO₃-N, and metal(loid)s such as Mn, Fe, Cu, and Zn varied notably across sampling sites. Risk quotient (RQ) analysis identified Mn as posing the highest ecological risk, followed by Cu and Fe. A combined probabilistic risk assessment using the SPI (Species Sensitivity Distribution–Probabilistic Risk Assessment–Inclusion-Exclusion Principle) model indicated a 32.46 % probability of toxic effects from nutrient and metal(loid) mixtures on aquatic organisms. This study underscores the effectiveness of DGT technology in assessing bioavailable contaminants and highlights the need for targeted risk management strategies to mitigate ecological impacts in the Chishui River.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"275 ","pages":"Article 121455"},"PeriodicalIF":7.7,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143690712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance and mechanism of CuFe2O4/2D-V to activate persulfate for levofloxacin removal","authors":"Ye Li,&nbsp;Bai-Hang Zhao,&nbsp;Chun Wang,&nbsp;Bao-Yu Zhang,&nbsp;Jia-Hang Liu","doi":"10.1016/j.envres.2025.121426","DOIUrl":"10.1016/j.envres.2025.121426","url":null,"abstract":"<div><div>Supported catalysts have gradually become a research hotspot in the field of removing antibiotics from wastewater. In this study, CuFe₂O₄@2D-V composite catalyst was prepared by basic hydrothermal synthesis. Two-dimensional expanded vermiculite (2D-V) was prepared by high temperature and ultrasonic stripping to provide a loading platform for CuFe₂O₄ metal ions. The characterization of CuFe₂O₄@2D-V was analysis by SEM, XRD and EDS. Then, levofloxacin (LVX) was chosen as representative to investigate the catalytic performance of CuFe₂O₄@2D-V by persulfate (PMS) activation. The optimal preparation conditions of CuFe₂O₄@2D-V and operating parameters of activating PMS to remove LVX were also studied. The result showed that under the condition of CuFe₂O₄ loading 50 %, initial pH 9.2, LVX concentration 10 mg/L, catalyst concentration 0.5 g/L and PMS concentration of 0.3 mM, the removal efficiency and reaction rate of LVX could reach 89 % and 0.071 min⁻¹, respectively. Meanwhile, the catalyst had a good stability and high reusability. Based on the analysis of intermediate products by LC-MS, three possible degradation pathways were proposed. Quenching experiments found that non-radical <span><math><mrow><mmultiscripts><msub><mi>O</mi><mn>2</mn></msub><mprescripts></mprescripts><none></none><mn>1</mn></mmultiscripts></mrow></math></span> dominated LVX degradation process. Also, the redox reaction between Cu (I)/Cu (II) and Fe (II)/Fe (III) played an important role in LVX removal process. This work might fill the gap in the application of vermiculite as a two-dimensional carrier, and provide further understanding for antibiotic wastewater treatment by metal based two-dimensional composite materials.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"275 ","pages":"Article 121426"},"PeriodicalIF":7.7,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microalgal-bacterial system responses to nitrogen forms in dairy farm wastewater: Focusing on the phycosphere and nitrogen transformation","authors":"Yuang Cao ,&nbsp;Xiaoyu Xu ,&nbsp;Suli Zhi ,&nbsp;Khinkhin Phyu ,&nbsp;Han Wang ,&nbsp;Jiahua Liu ,&nbsp;Chein-Chi Chang ,&nbsp;Keqiang Zhang","doi":"10.1016/j.envres.2025.121451","DOIUrl":"10.1016/j.envres.2025.121451","url":null,"abstract":"<div><div>As an environmentally friendly medium, microalgae are often used in wastewater treatment. However, few studies have examined the effects of different nitrogen forms on microalgae and bacteria, particularly regarding material and gene transfer and nitrogen metabolic pathways in phycosphere and various extracellular polymeric substance layers. To address this research gap, <em>Chlorella vulgaris</em> was used to treat the dairy farm wastewater with different nitrogen additives. The results showed that the dry weight and chlorophyll <em>a</em> production were lowest at high ammonia nitrogen concentrations (0.460 g/L and 0.883 mg/L, respectively). The ability of microalgae to remove total phosphorus and ammonia nitrogen was significantly enhanced at appropriate nitrogen concentrations. There were clear differences in community abundance between phycosphere and different extracellular polymeric substance layers bacteria. Nitrate nitrogen promoted electron transfer in photosynthesis, while organic nitrogen facilitated the synthesis of siderophores. In high-ammonia nitrogen wastewater, ammonia nitrogen conversion primarily occurred through the action of nitrifying bacteria, whereas denitrification promoted nitrate nitrogen conversion. There is an interaction between nitrogen forms and microalgal-bacterial system. The study provided critical insights for microalgae treatment of dairy farm wastewater, contributing to environmental friendly and resource recycling wastewater management.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"276 ","pages":"Article 121451"},"PeriodicalIF":7.7,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143690692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}