论文检索

总访问量：2644030次

总访客量：121575人

所有论文

1. 题目: Predictive Capability of Dye Removal from Wastewater Using Biochar by a Rough Set Machine Learning Model
文章编号: N25040915
期刊: ACS ES&T Engineering
作者: Paramasivan Balasubramanian, Muhil Raj Prabhakar, Chong Liu, Fayong Li, Zipeng Zhang, Pengyan Zhang
更新时间: 2025-04-09
摘要: Dye removal from wastewater treatment plants has gained attention in the waste management sector, necessitating advanced prediction techniques for effective planning and execution. While numerous machine learning studies have explored dye removal using biochar, a lack of general rules for various wastewater sources remains. This study employs rough set machine learning (RSML) to predict dye removal based on decision attributes, generating IF-THEN rules to classify conditional attributes. Key attributes identified include solution pH, temperature, and the initial concentration ratio of biochar to dye, which are critical for accurate predictions of the dye removal efficiency. The model produced 45, 23, and 39 rules for methylene blue, crystal violet, and Congo red, respectively, with 14, 11, and 15 approximate rules. The RSML achieved more than 80% accuracy for all three dyes, outperforming the existing classifiers. These findings have significant implications for establishing scientific rules in future dye removal research using biochar adsorption, enhancing the effectiveness of wastewater treatment processes.

2. 题目: Enhancing soil phosphorus availability with the application of moderate P-laden magnetic biochar as a slow-release fertilizer
文章编号: N25040914
期刊: Chemical Engineering Journal
作者: Hongjuan Xin, Yuanyuan Lu, Xiangtian Yang, Weidong Feng, Hekang Xiao, Chunlong Liu, Fayong Li, Xinqiang Liang
更新时间: 2025-04-09
摘要: With the increasing scarcity of phosphate rock, recyclable materials are expected to effectively reduce phosphorus (P) losses while enhancing soil-available P. This study aimed to assess the effects and mechanisms of P-laden magnetic biochar (P-MB) on the P-leaching potential and soil-available P. The experimental design included six treatments: CK (control), CF (inorganic P fertilizer application), and varying ratios of P-MB (BC-25%, BC-50%, BC-75%, and BC-100%) as substitutes for inorganic P fertilizer. The results showed that P-MB reduced the P content in the surface water and the total water-dispersible particle P content in the soil, and this effect increased with increasing substitution ratios. Notably, compared to the CF treatment, the BC-100% treatment reduced the medium-sized particle P (MPP) content and coarse-sized particle P (CPP) content by 22.91–37.85% and 13.09–24.04%, respectively, while increasing the nano-sized particle P (NPP) contents by 19.23–56.82%, mainly attributed to P-MB promoting the activity of beneficial genera such as Clostridium and Turicibacter. Solution ³¹P nuclear magnetic resonance (³¹P NMR) analysis revealed that 25% P-MB increased the proportion of orthophosphate compared to CF, providing more soil available P. However, a higher P-MB ratio led to a decline in this effect, likely because of the strong P adsorption capacity of the iron compounds in P-MB. A rice cultivation experiment further proved that the BC-25% treatment resulted in the highest plant biomass across all treatments. These findings suggest that a moderate substitution ratio of P-MB helps reduce the soil P-leaching potential and provides more available P for plant growth.

3. 题目: Ammonium salt stress-dependent compositional alteration in EPS from Desulfovibrio desulfuricans subsp. Desulfuricans and its mediating role in PbS QDs biosynthesis
文章编号: N25040913
期刊: Chemical Engineering Journal
作者: Liyao Chen, Xiangwu Huang, Zuoyi Yang, Weifeng Song, Zhixin Wu, Jinfu Li, Chuanying Tu, Guangwen Zheng, Xiangdan Zhang, Xiaoyan Bai
更新时间: 2025-04-09
摘要: Microorganisms and their extracellular polymeric substances (EPS) play a crucial role in the adsorption and removal of heavy metals. This study investigated the effects of ammonium salt (NH₄Cl, (NH₄)₂C₂O₄, and NH₄HCO₃) stress/induction on the EPS components of Desulfovibrio desulfuricans subsp. desulfuricans (D. desulfuricans subsp. desulfuricans) and their Pb(II) adsorption properties. In addition, EPS could mediate the biosynthesis of PbS quantum dots (QDs). The results revealed that EPS yield and Pb(II) equilibrium adsorption reached their maximum under 2.0 g/L NH₄Cl stress/induction. 3D-EEM, FTIR, and XPS analyses demonstrated that stress/induction increased the protein-like content and the quantity of functional groups in EPS, including –COOH, C=O, and –SH. After stress/induction, the production of acidic amino acids Glu and Asp in EPS increased by 53.02 % and 45.91 %, respectively. These amino acids offered numerous sites for Pb(II) adsorption and facilitated the rapid nucleation of PbS QDs. FTIR, XRD, TEM, BET, and zeta potential analyses showed that EPS participated in the biosynthesis of PbS QDs through Pb(II) adsorption and microcavity formation. The PbS QDs demonstrated exceptional properties such as fluorescence, stable crystal structure, uniform particle size, high specific surface area, and stable electrochemical properties. This study provides a theoretical foundation for heavy metal wastewater treatment and resource utilization.

4. 题目: Spatio-temporal dynamics variation of dissolved organic matter and water quality parameters in Giheung Reservoir: A vertical perspective.
文章编号: N25040912
期刊: Journal of Environmental Management
作者: Ziyu Lin, Hye-Ji Oh, Kwang-Hyeon Chang, Juin Yau Lim, Jong-Min Oh
更新时间: 2025-04-09
摘要: Water reservoirs in densely populated areas play a crucial role in water supply, irrigation, and flood regulation. This study investigated the spatiotemporal dynamics of dissolved organic matter (DOM) and its interactions with water quality parameters in Giheung Reservoir, South Korea. Monthly water samples were collected at three depths, measuring fifteen physicochemical properties alongside DOM characterization using Excitation-Emission Matrix Parallel Factor Analysis (EEM-PARAFAC), identifying four DOM components: C1 (microbial protein-like), C2 (humic-like), C3 (terrestrial humic-like), and C4 (tyrosine/tryptophan-like). Seasonal stratification influenced DOM distribution, with humic-like DOM (C2, C3) accumulating in deeper layers during summer, while protein-like DOM (C1, C4) dominated surface waters due to enhanced biological productivity, and mixing periods homogenizing DOM across depths. The dimictic thermal regime, with moderate summer stratification and full mixing in spring and autumn, governed these patterns. 2D correlation spectroscopy (2D-COS) identified sequential DOM variation across layers, with humic-like DOM increasing at depth during stratification. Fluorescence indices-Fluorescence Index (FI), Humification Index (HIX), and Biological Index (BIX)-were integrated into structural equation modeling (SEM), showing that temperature and dissolved oxygen strongly drive protein-like DOM, while nitrogen and phosphorus compounds shape DOM reactivity. These findings enhance understanding of DOM biogeochemical processes and provide valuable insights for reservoir management to maintain water quality.

5. 题目: Oxytetracycline Hydrochloride Adsorption by Biochar From Loofah Sponge Using Response Surface Method
文章编号: N25040911
期刊: Clean - Soil Air Water
作者: Fanbao Deng, Jihong Zhao, Xiaoqian Yin, Xue Song, Yongde Liu, Jie Zhang, Tianrun Bai, Liwen Zhang
更新时间: 2025-04-09
摘要: A potential biochar (KLSF‐BC) was prepared by pyrolysis of loofah sponge (LS) at 600°C using KOH as an activator to adsorb oxytetracycline hydrochloride (OTCH). The response surface method (RSM) was applied to obtain the best preparation parameters (the first pyrolysis temperature of 573°C and pyrolysis time of 138 min, LSF‐BC/KOH, 1:3, m/m) and adsorption conditions (OTCH concentration: 100 mg L−1, adsorbent dosage: 0.84 g L−1, adsorption time: 28 min, initial solution pH: 5.1), under which the adsorption capacity of KLSF‐BC for OTCH was 662.96 mg g−1. The adsorption data of OTCH on KLSF‐BC conformed to the pseudo‐second‐order model and Freundlich model. The removal mechanisms of OTCH involved hydrogen bonding, π–π EDA interaction, pore filling, and electrostatic interactions. The study confirmed the great potential and significant application prospects of KLSF‐BC for removing OTCH from wastewater, providing a valuable reference for biomass resource utilization and antibiotics treatment.

6. 题目: Carbon Isotopic Signatures of Aquifer Organic Molecules along Anthropogenic Recharge Gradients
文章编号: N25040910
期刊: Environmental Science & Technology
作者: Xu Cao, Wei He, Xian-Ge Wang, Xiaorui Chen, Bing Yi, Chao Ma, Xiaobo Li, Yu Liu, Wei He, Yuanyuan Shi
更新时间: 2025-04-09
摘要: The property of groundwater dissolved organic matter (DOM) subjected to anthropogenic groundwater recharge (AGR) might be affected by the water quality disparity between surface water and natural groundwater. However, the diverse molecular scenarios of groundwater DOM under uneven recharging levels remain largely unexplored. We combined molecular characteristics, carbon isotopic signatures of organic molecules, and end-member mixing analysis to explore the sensitivity and potential tracking capabilities of DOM to AGR along with recharging gradients. Our findings suggested that AGR enriched groundwater with diverse, saturated, labile, and sulfur-rich molecules, amplifying DOM abundance and intensity, which intensified with recharge gradients. Additionally, S-containing molecules and their indicators like CHOS% (with threshold values of 7.82%) exhibited high sensitivity and predictive power for AGR recognition. The major signatures (diversity, saturated degree, and stability) indicated by ¹³C-containing molecules were similar to the whole molecular pool. Notably, specific molecules (C₁₂H₁₀O₅S and C₁₅H₁₆O₁₂), although not detected in all groundwater samples, exhibit robust stability or favorable solubility, rendering them potential candidates as AGR-sensitive molecules. The R_13C/12C ratio of ¹³C-containing C₁₉H₂₄O₅ emerged as the most robust tracer, exhibiting a strong correlation with the recharge ratio and the smallest deviation from the theoretical mixing line, signifying its optimal suitability for precise groundwater DOM source apportionment. This study offers novel insights into AGR impacts and contributes to fostering a harmonious balance between human activities and water resource sustainability.

7. 题目: Single-step pyrolytic synthesis of ultra-microporous ammonialized biochar for carbon dioxide capture.
文章编号: N25040909
期刊: Journal of Environmental Management
作者: Che-Jung Hsu, I-Lin Kuo, Hsing-Cheng Hsi, Su Shiung Lam, Ying-Pin Huang, Yu-Chieh Ting
更新时间: 2025-04-09
摘要: Carbon dioxide (CO2) is a significant greenhouse gas that plays a pivotal role in driving global warming and climate change. Its primary sources stem from human activities, notably transportation, power generation, and industrial processes. Directly capturing CO2 emissions at their origins is widely recognized as a potent and efficient approach to reducing emissions. Biochar has emerged as a promising material for capturing CO2 owing to its stability, hydrophobic nature, ease of preparation, and economic advantages. Nevertheless, its ability to adsorb CO2 is constrained in environments with relatively low pressure (<1 bar). Consequently, modifying and refining biochar is a strategy to enhance its affinity for CO2. In this work, Leucaena leucocephala, a major invasive species in Asia, was selected as the biomass precursor, and a single synthesis process combining pyrolysis and ammonialization was employed to produce the ammonialized biochar (ABC). Among the synthesized biochars, ABC800 (produced at 800 °C) exhibits desirable surface properties with high surface area (SBET = 836.5 m2/g), microporosity (Smicro = 753.3 m2/g), and ultra-microporosity (Sultra-micro = 376.9 m2/g). In addition, ABC800 demonstrates superior CO2 adsorption capacity (4.06 mmol/g at 0 °C). Isothermal and kinetic results show that ABC800's CO2 adsorption follows the Langmuir-Freundlich and pseudo-second-order (PSO) equations, indicating both physical and chemical interactions. The correlation between adsorption performance, pore structure, and nitrogen content highlights the potential of ABC800 for CO2 capture, particularly at elevated temperatures. Overall, this work offers new insights into a potentially sustainable approach for mitigating greenhouse gas emissions.

8. 题目: Sustainable Transformation of DOM in Sedimentation Sludge Water by UV-Fe2+/PAA: Toward Cleaner Production via FT-ICR MS
文章编号: N25040908
期刊: Journal of Cleaner Production
作者: Jingkai Chen, Ya Wang, Fangqi Peng, Naixin Kang, Xuefan Rao, Wei Liu, Mi Deng, Ming Sun, Zhengong Tong, Guizhen Feng, Caixia Kang, Lili Fang, Liwen Jiang
更新时间: 2025-04-09
摘要: Sedimentation sludge water from drinking water treatment plants (DWTPs) contains substantial amounts of dissolved organic matter (DOM) and of disinfection by-products (DBPs) precursors, posing risks to water quality if directly reused , . This study employed Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS) to investigate the molecular transformation pathways and reaction mechanisms of DOM in sedimentation sludge water during the UV-Ferrous Ion/Peracetic Acid (UV-Fe²⁺/PAA) process. Results revealed that the process significantly reduces both the molecular intensity (89.4%) and molecular number (71.0%) of DOM, preferentially removes reductive DOM, and elevates its saturation, thus enhancing the oxygen content of DOM molecules. Two dominant types of DOM-highly unsaturated/phenolic compounds (HuPh) and aliphatic substances (Aliph)-undergo intense and complex molecular transformation reactions via oxygen addition (+nO) and dealkylation (-n(CH₂)) pathways. Notably, the molecular transformations of HuPh and Aliph exhibit distinct differences. Aliph exhibited more complete dealkylation reactions, while HuPh predominantly underwent oxygen addition reactions. Mass difference network analysis indicates that both HuPh and Aliph can serve as precursors or products (including intermediates and final products) within these reactions. HuPh can be converted into other HuPh and PolyP through multiple pathways. By comparison, Aliph's transformation pathways are more linear, primarily yielding other Aliph and HuPh, along with minor amounts of Carbo. This research provides valuable insights into the molecular transformations of DOM in sedimentation sludge water and promoting environmentally sustainable water reuse practices within drinking water treatment facilities.

9. 题目: Enhanced Catalytic Activity of Rice Husk Biochar for Antibiotics Degradation: Synergistic Effects of Copolymerization and Mineral Removal.
文章编号: N25040907
期刊: Journal of Environmental Chemical Engineering
作者: Krishnamoorthy Silambarasan, Alam Venugopal Narendra Kumar, Won Sik Shin
更新时间: 2025-04-09
摘要: Effective utilization of rice husk (RH) biomass is essential to mitigate the environmental issues associated with it. Though RH biochar has been widely studied as a metal free carbon catalyst for persulfate activation, its performance is often limited by low active site density. In this study, we propose a two-step strategy to enhance RH biochar’s active site density through copolymerization, and mineral etching process. This design strategy enables the creation of new metal-free active centers and enhances the exposure of existing active sites on the RH surface, thereby effectively overcoming the limitations of metal leaching in metal/carbon composite systems. The prepared RH biochar/copolymer composite catalyst displayed excellent tetracycline (TC) removal efficiency with peroxydisulfate. Composition optimization results showed RH biochar with 33 wt% of copolymer derived carbon has high tetracycline degradation efficiency. Furthermore, the removal of mineral impurities significantly enhanced the catalytic efficiency, enabling a 50% reduction in the catalyst concentration while maintaining the same level of degradation performance. An increased specific surface area of the catalyst boosts the catalytic efficiency. Electron spin resonance spectroscopy (ESR), scavenging experiments, and electrochemical studies confirmed that tetracycline degradation occurs mainly through electron transfer pathway. The composite also displayed a satisfactory TC degradation performance with anions and in real groundwater conditions. This study introduces a novel strategy for creating metal-free active centers on RH biochar, offering a promising solution for real-world water treatment applications.

10. 题目: Organic carbon sequestration in global croplands: evidenced through a bibliometric approach
文章编号: N25040906
期刊: Frontiers in Environmental Science
作者: Muhammad Mohsin Abrar, Muhammad Ahmed Waqas, Khalid Mehmood, Ruqin Fan, Muhammad Suleman Memon, Muhammad Ajmal Khan, Nadeem Siddique, Minggang Xu, Jianjun Du
更新时间: 2025-04-09
摘要: Increasing soil organic carbon (SOC) in cropland soils improves soil health and water quality, crop productivity, and resilience to climate-driven changes by influencing key soil processes. However, research on cropland SOC sequestration based on bibliometric analyses of highly cited documents is lacking. This bibliometric study investigated the current status and development characteristics, research impact, intellectual base, and research hotspots of highly cited cropland SOC sequestration research using the Web of Science Core Collection databases from 2012 to 2022. The analysis and visualization tools such as Biblioshiny, VOSviewer, CiteSpace, Power BI, and Flourish Studio, provided a comprehensive approach for research evaluation, identifying trends, and knowledge mapping of cropland SOC sequestration research. The findings indicate that the United States and China dominate global research, with the Chinese Academy of Sciences as the leading institution. Key journals include Soil Biology and Biochemistry and Geoderma. e. The trend topic graph indicated that “soil organic carbon” and “soil organic matter” are the most persistent themes since 2015. In contrast, recent research focuses on “climate change mitigation,” “soil health” and “soil aggregation”. Moreover, burst analysis of citation and keywords revealed significant insights into the potential role of microbes in transforming and stabilizing soil organic matter. The findings of the present study emphasized that adopting management practices aimed at enhancing carbon inputs increases C sequestration in croplands, thus improving soil health and help in advancing Sustainable Development Goals (SDGs).

11. 题目: Investigating the impact of organic matter on Vibrio parahaemolyticus inactivation in aquaculture water by UV-LED system.
文章编号: N25040905
期刊: Journal of Environmental Management
作者: Pawatt Thanajiradech, Bongkotrat Suyamud, Phichanan Duchda, Jenyuk Lohwacharin, On-Anong Larpparisudthi
更新时间: 2025-04-09
摘要: Ultraviolet (UV) irradiation becomes a promising technology in inactivating pathogenic microbes, but the compositional change of organics and its consequence of inactivation need further study in raw water during UV light-emitting diode (UV-LED) irradiation. Herein, the bench-scale study aimed at evaluating the effect of organic fractions isolated from shrimp-farming water on the inactivation efficiency of Vibrio parahaemolyticus using UV-LED process at wavelengths of 265 nm, 280 nm, and combined wavelengths. The lowest required UV fluence (4.06 mJ/cm2) for 3-log inactivation was attained with UV-LED 280 nm. After UV irradiation the changes in elemental compositions of organic compounds, based on H/C and O/C ratios, were small. This is probably due to low UV exposure and UV resistant structure of organic constituents, predominantly lipid-like compounds. Contrarily, fluorescent spectroscopic analysis that showed degradation of protein-like substances by UV irradiation. In addition, the significant declines in the number of chemical formulas in organic compounds were identified through non-target screening using orbitrap mass spectrometry, suggesting degradation and amalgamation into new compounds. The presence of organic compounds did not profoundly affect inactivation efficiency at applying a minimum required fluence or greater. This study highlights the potential of UV-LED irradiation, particularly at 280 nm, for efficient inactivation of V. parahaemolyticus and subsequent molecular structure alteration of organic matter after UV irradiation.

12. 题目: Biochar for Carbon-Negative Hydrogen Production from Fossil Fuel Reservoirs
文章编号: N25040904
期刊: Journal of Cleaner Production
作者: Keju Yan, Xiaokun Yang, Qingwang Yuan
更新时间: 2025-04-09
摘要: Biochar is an abundant and inexpensive material derived from biomass, renowned for its exceptional physicochemical properties such as high surface area and superior dielectric parameters. In this perspective, we first propose and evaluate a carbon-negative approach that utilizes biochar for in-situ hydrogen (H₂) production from natural gas reservoirs through electromagnetic (EM) heating. By critically reviewing synthesized parameters, properties and applications of biochar, it becomes clear that biochar can boost natural gas conversion to hydrogen when used as a catalyst. Additionally, the subsurface use of biochar improves EM-heating efficiency, enhances economic viability, aids in agricultural waste management, and captures substantial amounts of carbon in the subsurface. These advantages make biochar a perfect material for optimizing in-situ hydrogen production from gas reservoirs via EM heating. In this paper, we highlight the fundamentals, prospects, and knowledge gaps of this new technology. Key factors such as catalytic performance, engineering feasibility, economic viability, and industrial synergies are thoroughly evaluated. The challenges in biochar synthesis, hydrogen production efficiency, well safety, and downhole technologies are also discussed. By leveraging multidisciplinary industry resources, renewable energies, and public support, it is anticipated that the hydrogen cost of this approach could fall below $1/kg H₂, thus enabling a transformative, affordable carbon-negative hydrogen production from fossil fuel reservoirs.

13. 题目: Dynamics of organic matter and bacterial community during the composting process of food waste rich in oil with the amendment of Pseudomonas aeruginosa
文章编号: N25040903
期刊: Journal of Cleaner Production
作者: Yue Lu, Jingwen Yan, Xiangyu Peng, Qiqi Fu, Jie Yuan, Jianhong Jiang, Lin Tang
更新时间: 2025-04-09
摘要: Composting serves as an economical and local solution for managing organic waste, enabling the repurposing of food scraps while curtailing significant greenhouse gas emissions from landfill burning. Nonetheless, the high oil concentrations in food waste poses challenges for the effective breakdown of organic materials during composting. Pseudomonas aeruginosa (P. aeruginosa), a bacterium commonly found in various environments, is renowned for its ability to biodegrade crude oil and other organic matter. This research aimed to explore how P. aeruginosa inoculation influences the decomposition of organic matter and the succession of microbial communities during composting of food waste with varying oil concentrations. Findings revealed that inoculating P. aeruginosa significantly sped up the mineralization of organic matter, enhancing the seed germination index of oil-rich composting (6% oil) by 9.42% (p<0.05). Additionally, the inoculation of P. aeruginosa increased the relative abundance of Saccharomonospora, with Firmicutes reaching a remarkable 97.55% during the thermophilic stage of the oil-rich composting. The analysis showed that high oil concentrations hindered the composting humification process. However, inoculation with Pseudomonas aeruginosa reduced the probability of localized anaerobic environment due to hydrophobicity of oils during composting, avoided the generation of toxic metabolites due to insufficient oil degradation, and promoted the degradation of organic matter and the succession of microbial communities during the composting process. These findings provide a theoretical reference for enhancing the efficiency of oil-rich food waste composting.

14. 题目: Highly efficient fenton-like degradation of florfenicol by cobalt-modified magnetic biochar activated with hydrogen peroxide
文章编号: N25040902
期刊: Journal of Environmental Chemical Engineering
作者: Chengjie Xue, Yifu Peng, Zhanqiang Fang
更新时间: 2025-04-09
摘要: Magnetic biochar (MBC) is excellent in magnetic separation and hydrogen peroxide (H₂O₂) activation. However, its small specific surface area (SSA) limits the rapid adsorption of pollutants and improves activation efficiency. In this study, the cobalt-doped MBC increased (CoMBC) its SSA by 1.8-fold and significantly improved the H₂O₂ activation capacity. The specific effects of cobalt doping of MBC on the leaching of metal ions, generation of reactive oxygen species (ROSs) and recycling performance were investigated. The results showed that cobalt doping promoted the homogeneous distribution of iron sites on the surface of biochar and reduced iron ion leaching. Meanwhile, the CoMBC+H₂O₂ system had a kinetic constant of 0.104 min^-1 for the degradation of florfenicol (FLO), which was 50 times higher than that of MBC+H₂O₂. It was shown by Electron Paramagnetic Resonance with free radical quenching experiments that hydroxyl radicals (·OH), singlet oxygen (¹O₂), and superoxide radicals (·O₂^-) were generated in the system. The material surface-bound hydroxyl radicals were the main ROS in the degradation process of FLO, with a contribution of >66%. Co-doping increases the saturation magnetization strength of MBC, making them easier to collect for reuse. Cycling experiments showed that after 5 cycles, CoMBC could still activate H₂O₂ to remove 50% of FLO. In addition, the CoMBC+H₂O₂ system removed a wide range of antibiotics, demonstrating its strong pollutant removal capability. In conclusion, this study provides guidance for the preparation of MBC and its activation of H₂O₂ to removal new pollutants.

15. 题目: Salinity Stress Modulates the Dynamic Co-occurrence Interactions between DOM and Microbial Community Profiles in a Typical River–Estuary–Ocean Continuum: From the Pearl River to South China Sea
文章编号: N25040901
期刊: ACS ES&T Engineering
作者: Chao Zhang, Yingqiang Li, Junyu Zhu, Zhe Zhang, Yue Xie, Shuna Fu, Wanbing Zheng, Zihan Shen, Bangxing Ren, Zhenguo Chen, Haijun He, Guang-Guo Ying, Harald Horn, Amy M McKenna, Mingzhi Huang
更新时间: 2025-04-09
摘要: The pivotal role of salinity stress in regulating the microbial-driven dissolved organic matter (DOM) transformation in river–estuary–ocean continua has consistently been overlooked. The difference in the osmotic pressure caused by the salinity fluctuations between freshwater and seawater results in the formation of distinct microbial community profiles, subsequently triggering dynamic DOM transformation. However, the complexity of the dynamic interactions poses a vital challenge in unraveling the underlying mechanisms at the molecular level. To bridge this gap, the utilization of FT-ICR MS, integrated with co-occurrence network, emerges as a potent tool. In this study, we demonstrated that, despite the major influence of urbanization on the DOM input, as characterized by spectroscopic characteristics, its impact on the transformation processes of DOM is negligible when compared to the salinity stress. In contrast, salinity can trigger similar transformation patterns of DOM among diverse microbial populations, underscoring the pivotal role of salinity. Concurrently, salinity enhances microbial transformations of DOM (e.g., higher biological index and the ratio of product to precursor), and furthermore, the gradual increase in total nitrogen with increasing salinity may be correlated with the salinity-induced suppression of denitrifying bacteria. The co-occurrence network analysis offers mechanistic insights into delineating the intricate interplay of synergism and antagonism among microbial DOM transformations under salinity conditions.

16. 题目: 1Identifying DOM sources of a closed lake basin in arid and semi-arid regions using Bayesian model and grey influence analysis
文章编号: N25040808
期刊: Environmental Research
作者: Shixiang Zhang, Qingqian Li, Dongping Liu, Yan Hao, Hongjie Gao, Huibin Yu
更新时间: 2025-04-08
摘要: Complicated replenishment for closed lakes in arid and semi-arid regions induces challenges in tracing the origins of water pollution. It is urgent to identify sources of dissolved organic matter (DOM) for revealing water quality fluctuations. In this study, fluorescence excitation-emission matrix spectrum (EEMs) combined with parallel factor analysis (PARAFAC) and grey influence analysis (GINA) to trace key parameters of end-member mixture analysis (EMMA), by which ratios of DOM sources could be determined in Shahu Lake basin of China. Five components (C1-C5) were extracted by PARAFAC: C1-C2 known as tryptophan-like fluorescence substances (TRLF), C3 defined as microbial metabolites (MM), C4-C5 associated with fulvic-like fluorescence substances (FLF). Total fluorescence intensity in Shahu Lake (465±59 a.u.) was significantly lower than neighbor water bodies (953±179 a.u.), indicating the potential impact of neighbor water bodies. Biological index (BIX), humification index (HIX), freshness index (β: α), and T/F (fluorescence intensity ratio of TRLF and FLF) were selected as optimal indicators by GINA. EMMA results revealed that DOM in Shahu Lake predominantly originates from Wetland (34.6%) and Diannong River (28.1%), demonstrating active water exchange between these systems. The identification of DOM sources in a given sampling site could confirm the effectiveness of the combination of the optimal indices for accurate traceability of DOM in Shahu Lake. This integrated analytical framework provided a robust methodology for quantifying proportional contributions of pollution sources in lacustrine systems, particularly in hydrologically closed basins.

17. 题目: A review of the metabolic response of the anammox process to biochar carriers:Performance Impacts and Mechanisms
文章编号: N25040807
期刊: Journal of Environmental Chemical Engineering
作者: Menghan Wang, Jiajia Xu, Chenyu Xia, Weihua Li
更新时间: 2025-04-08
摘要: Anaerobic ammonium oxidation (Anammox), as an efficient biological nitrogen removal process, has been engineered and applied in the field of side-stream wastewater. Inhibition of nitrite-oxidizing bacteria (NOB) and lack of biomass for anaerobic ammonia oxidation are the core barriers to the scale-up of mainstream PN-A technology. In recent years, biochar has shown broad application prospects in the mainstream anammox field due to its unique ability to reduce nitrates. This review systematically summarizes the role of biochar carriers under different feedstocks and production conditions for the promotion of nitrogen removal performance in anammox reactors and the effective mitigation of pollutant inhibition, and further analyzes the possible mechanisms of action involved in terms of metabolic changes at the microbial molecular level. The structure of biochar optimizes the survival environment of anaerobic ammonium oxidation bacteria (AnAOB), promotes the activity and gene expression of functional bacteria, and synergizes with partial denitrification and anaerobic ammonia oxidation to achieve the degradation of nitrate and the stable supply of nitrite, which enhances the efficiency of anammox for nitrogen removal. In addition, the potential risks of biochar to the environment are summarized, and risk aversion measures are given to promote the anammox reaction and promote the friendly development of the environment. This indicates that the future biochar anammox process can be carried out in the direction of research on biochar harmlessness, compositing and modification strategies, to provide a theoretical basis for biochar in the mainstream anammox.

18. 题目: Comparative analysis of Fe(IV)-based advanced oxidation processes in generating disinfection byproducts and altering dissolved organic matter molecular structure
文章编号: N25040806
期刊: Chemical Engineering Journal
作者: Zeyu Chen, Zhen Wang, Jinxing Ma, Xianhui Li, Yang Zhou, Yuan Gao, Tao Yang, Zhong Zhang, Zihao Wu
更新时间: 2025-04-08
摘要: Fe(IV)-based advanced oxidation processes (AOPs) offer promising avenues for water treatment, yet their specific impacts on disinfection byproduct (DBP) formation and dissolved organic matter (DOM) alteration remain insufficiently explored. This study systematically investigated three Fe(IV)-based AOPs—Fe(II)/peroxydisulfate (PDS), Fe(II)/hypochlorous acid (HOCl), and Fe(II)/ozone (O₃)—to evaluate their efficacy in modifying DOM molecular structures and reducing the formation of harmful DBPs. Results indicated that Fe(II)/PDS effectively controlled the formation of specific DBPs and simplified DOM complexity. After treatment with Fe(II)/PDS, the total DBP concentration formed during the disinfection process was the lowest, at 35.6 µg/L. The Fe(II)/O₃ system, owing to its strong oxidizing potential, achieved the highest overall pollutant removal but led to increased formation of nitrogenous DBPs due to extensive DOM fragmentation, reaching a concentration of 2.83 µg/L. However, it effectively inhibited NDMA formation, with a post-disinfection NDMA concentration of only 5.83 ng/L. Treatment with Fe(II)/HOCl generated numerous oxygen-rich DOM molecules (O/C_wa: 0.601), resulting in elevated production of haloacetic acid (HAAs), which reached 38.4 µg/L. These findings highlight the necessity of tailoring the selection of Fe(IV)-AOP to specific treatment scenarios, considering the unique capabilities and limitations of each system to optimize water treatment processes and meet stringent environmental standards.

19. 题目: Surface and Interface Modification of Biochar Based on Thermal Nanobubble Water
文章编号: N25040805
期刊: Journal of Environmental Chemical Engineering
作者: Mei Ru Yue, Jia Bing Liu, Piao Yi Jiang, Wang Kai Tong, Han Tang, Jia Wang, Wenjuan Wang, Min-tian Gao, Nan Liu, Jiajun Hu, Jixiang Li
更新时间: 2025-04-08
摘要: Carbonaceous materials are widely used as adsorbents, activators, or soil amendments in the environmental field. However, its major drawback is that the released dissolved solids can lead to functional and structural instability, making it uncontrollable during long-term utilization. In this study, biochar prepared from the saccharification residue of barley straw was used as a precursor biochar. Based on the unique surface/interface effect and over-100-degree survival ability of nanobubbles, biochar was modified with thermal nanobubble water to enhance its stability and endow it with a distinct surface/interface property. Mathematical models were established to explore the relationship between different thermal nanobubble water modification conditions (gas source, nanobubble concentration, time, and temperature) and modified biochar properties, aiming to optimize adsorption capacity while reducing dissolved solids. Under optimal modification conditions, modified biochar was improved compared with precursor biochar: its specific surface area increased by 4218%~4484%, pore volume by 3200%~3600%, dispersive surface energy by 419%~1098%, polar surface energy by 669%~688%, dissolved solids by -97% ~ -98%, and adsorption capacity by 57%~66%. Also, the functional groups and adsorption mechanism of modified biochar varied with the modification's nanobubble gas source. In application, the adsorption capacity of modified biochar for five typical phenolic organic pollutants was 69 ~ 97 mg/L, and it showed good adsorption and regeneration ability in a fixed column. Moreover, calculations showed it could reduce carbon emissions by 0.52 tCO₂/yr/t. This study offers a novel biochar modification method and insight, featuring low cost and high environmental benefits.

20. 题目: Seasonal effects of plant functional groups on molecular biogeochemistry of dissolved organic matter in porewater of a poor fen
文章编号: N25040804
期刊: Frontiers in Environmental Science
作者: Zhimin Song, Maryam Khaksari, Erik A Lilleskov, Evan S Kane, Paul V Doskey
更新时间: 2025-04-08
摘要: Climate change may transform peatlands from net carbon (C) sinks to C sources, which could result in a positive feedback to global warming. Warmer temperatures might lower water tables, increase the abundance of shrubs, slow Sphagnum and sedge growth and further accelerate the decomposition of dissolved organic matter (DOM) with a concomitant release of C from the surface. Studies in which vascular plant functional groups (PFGs) in peatlands have been manipulated to mimic the potential effects of a warming climate on DOM are scarce. In the subject study, seasonal effects of PFGs on the molecular composition of DOM of peat porewater were investigated in manipulated plots of a poor fen in Nestoria, Michigan, United States. The organic molecular composition of the peat porewater exhibited strong interactions with PFG and season. Monomeric substances (e.g., monosaccharides and amino acids), which are found in root exudates and are also the products of decomposition of polymeric substances, were least abundant early in the growing season and increased in abundance late in the season. High levels of DOC and proteinaceous substances and an unlikely abundance of total phenolic substances in sedge plots with Sphagnum were attributed (1) to rapid decomposition of labile compounds in the oxygen-rich microenvironment surrounding sedge roots and preservation of more recalcitrant substances or (2) to contributions of lignin-like substances by Sphagnum. Tannin- and lignin-like compounds in the Ericaceae plots with Sphagnum were attributed to inputs of the woody biomass. The refractory organic substances apparently persisted due to a combination of rhizosphere anoxia and suppression of free-living saprotroph activity by the Ericoid mycorrhizal fungi. Through a novel analytic approach, which included organic compound class analysis, determination of spectral indices, and molecular analysis by ESI-UHR-MS, we observed indirect evidence of the complexation of proteinaceous substances by tannin-like substances and the apparent reaction of phenolic moieties of lignin-like substances with amino sugars. A synergistic effect between sedge and Ericaceae was likely responsible for rapid decomposition of DOM in plots with Sphagnum in which vascular PFGs were unmanipulated. Observing the effects of vascular PFGs on seasonal variations of the molecular composition of DOM will improve predictions of the short- and long-term storage of C in peatlands in a changing climate.